// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
import "./interfaces/IStargateRouter.sol";
import "./interfaces/IStargateEthVault.sol";
contract RouterETH {
    address public immutable stargateEthVault;
    IStargateRouter public immutable stargateRouter;
    uint16 public immutable poolId;
    constructor(address _stargateEthVault, address _stargateRouter, uint16 _poolId){
        require(_stargateEthVault != address(0x0), "RouterETH: _stargateEthVault cant be 0x0");
        require(_stargateRouter != address(0x0), "RouterETH: _stargateRouter cant be 0x0");
        stargateEthVault = _stargateEthVault;
        stargateRouter = IStargateRouter(_stargateRouter);
        poolId = _poolId;
    }
    function addLiquidityETH() external payable {
        require(msg.value > 0, "Stargate: msg.value is 0");
        uint256 amountLD = msg.value;
        // wrap the ETH into WETH
        IStargateEthVault(stargateEthVault).deposit{value: amountLD}();
        IStargateEthVault(stargateEthVault).approve(address(stargateRouter), amountLD);
        // addLiquidity using the WETH that was just wrapped,
        // and mint the LP token to the msg.sender
        stargateRouter.addLiquidity(
            poolId,
            amountLD,
            msg.sender
        );
    }
    // compose stargate to swap ETH on the source to ETH on the destination
    function swapETH(
        uint16 _dstChainId,                         // destination Stargate chainId
        address payable _refundAddress,             // refund additional messageFee to this address
        bytes calldata _toAddress,                  // the receiver of the destination ETH
        uint256 _amountLD,                          // the amount, in Local Decimals, to be swapped
        uint256 _minAmountLD                        // the minimum amount accepted out on destination
    ) external payable {
        require(msg.value > _amountLD, "Stargate: msg.value must be > _amountLD");
        // wrap the ETH into WETH
        IStargateEthVault(stargateEthVault).deposit{value: _amountLD}();
        IStargateEthVault(stargateEthVault).approve(address(stargateRouter), _amountLD);
        // messageFee is the remainder of the msg.value after wrap
        uint256 messageFee = msg.value - _amountLD;
        // compose a stargate swap() using the WETH that was just wrapped
        stargateRouter.swap{value: messageFee}(
            _dstChainId,                        // destination Stargate chainId
            poolId,                             // WETH Stargate poolId on source
            poolId,                             // WETH Stargate poolId on destination
            _refundAddress,                     // message refund address if overpaid
            _amountLD,                          // the amount in Local Decimals to swap()
            _minAmountLD,                       // the minimum amount swap()er would allow to get out (ie: slippage)
            IStargateRouter.lzTxObj(0, 0, "0x"),
            _toAddress,                         // address on destination to send to
            bytes("")                           // empty payload, since sending to EOA
        );
    }
    // this contract needs to accept ETH
    receive() external payable {}
}// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
interface IStargateRouter {
    struct lzTxObj {
        uint256 dstGasForCall;
        uint256 dstNativeAmount;
        bytes dstNativeAddr;
    }
    function addLiquidity(
        uint256 _poolId,
        uint256 _amountLD,
        address _to
    ) external;
    function swap(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLD,
        uint256 _minAmountLD,
        lzTxObj memory _lzTxParams,
        bytes calldata _to,
        bytes calldata _payload
    ) external payable;
    function redeemRemote(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        uint256 _minAmountLD,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable;
    function instantRedeemLocal(
        uint16 _srcPoolId,
        uint256 _amountLP,
        address _to
    ) external returns (uint256);
    function redeemLocal(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable;
    function sendCredits(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress
    ) external payable;
    function quoteLayerZeroFee(
        uint16 _dstChainId,
        uint8 _functionType,
        bytes calldata _toAddress,
        bytes calldata _transferAndCallPayload,
        lzTxObj memory _lzTxParams
    ) external view returns (uint256, uint256);
}
pragma solidity 0.7.6;
interface IStargateEthVault {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
    function approve(address guy, uint wad) external returns (bool);
    function transferFrom(address src, address dst, uint wad) external returns (bool);
}

// Copyright (C) 2015, 2016, 2017 Dapphub
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.7.6;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./interfaces/IStargateEthVault.sol";
// This contract always UNWRAPS the erc20 for native gas token on transfer + transferFrom.
// If you wish to disable the transfer auto-unwrap, you can specify _to addresses with `setNoUnwrapTo`
contract StargateEthVault is IStargateEthVault, Ownable, ReentrancyGuard {
    string public constant name     = "Stargate Ether Vault";
    string public constant symbol   = "SGETH";
    uint8  public constant decimals = 18;
    uint256 public totalSupply;
    event Approval(address indexed src, address indexed guy, uint wad);
    event Transfer(address indexed src, address indexed dst, uint wad);
    event Deposit(address indexed dst, uint wad);
    event Withdrawal(address indexed src, uint wad);
    event TransferNative(address indexed src, address indexed dst, uint wad);
    mapping (address => uint)                       public  balanceOf;
    mapping (address => mapping (address => uint))  public  allowance;
    mapping (address => bool)                       public  noUnwrapTo;
    // if you do NOT wish to unwrap eth on transfers TO certain addresses
    function setNoUnwrapTo(address _addr) external onlyOwner {
        noUnwrapTo[_addr] = true;
    }
    function deposit() public payable override {
        balanceOf[msg.sender] += msg.value;
        totalSupply += msg.value;
        emit Deposit(msg.sender, msg.value);
    }
    function withdraw(uint wad) external override {
        require(balanceOf[msg.sender] >= wad);
        balanceOf[msg.sender] -= wad;
        msg.sender.transfer(wad);
        totalSupply -= wad;
        emit Withdrawal(msg.sender, wad);
    }
    function approve(address guy, uint wad) external override returns (bool) {
        allowance[msg.sender][guy] = wad;
        emit Approval(msg.sender, guy, wad);
        return true;
    }
    function transfer(address dst, uint wad) external override returns (bool) {
        return transferFrom(msg.sender, dst, wad);
    }
    function transferFrom(address src, address dst, uint wad) public override nonReentrant returns (bool) {
        require(balanceOf[src] >= wad);
        if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
            require(allowance[src][msg.sender] >= wad);
            allowance[src][msg.sender] -= wad;
        }
        // always decrement the src (payer) address
        balanceOf[src] -= wad;
        if(noUnwrapTo[dst]){
            // we do *not* unwrap
            balanceOf[dst] += wad;
            emit Transfer(src, dst, wad);
        } else {
            // unwrap and send native gas token
            totalSupply -= wad; // if its getting unwrapped, decrement the totalSupply
            (bool success, ) = dst.call{value: wad}("");
            require(success, "SGETH: failed to transfer");
            emit TransferNative(src, dst, wad);
        }
        return true;
    }
    function renounceOwnership() public override onlyOwner {}
    receive() external payable {
        deposit();
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    constructor () {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
pragma solidity 0.7.6;
interface IStargateEthVault {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
    function approve(address guy, uint wad) external returns (bool);
    function transferFrom(address src, address dst, uint wad) external returns (bool);
}// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
// imports
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./Factory.sol";
import "./Pool.sol";
import "./Bridge.sol";
// interfaces
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./interfaces/IStargateRouter.sol";
import "./interfaces/IStargateReceiver.sol";
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
contract Router is IStargateRouter, Ownable, ReentrancyGuard {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    uint8 internal constant TYPE_REDEEM_LOCAL_RESPONSE = 1;
    uint8 internal constant TYPE_REDEEM_LOCAL_CALLBACK_RETRY = 2;
    uint8 internal constant TYPE_SWAP_REMOTE_RETRY = 3;
    //---------------------------------------------------------------------------
    // STRUCTS
    struct CachedSwap {
        address token;
        uint256 amountLD;
        address to;
        bytes payload;
    }
    //---------------------------------------------------------------------------
    // VARIABLES
    Factory public factory; // used for creating pools
    address public protocolFeeOwner; // can call methods to pull Stargate fees collected in pools
    address public mintFeeOwner; // can call methods to pull mint fees collected in pools
    Bridge public bridge;
    mapping(uint16 => mapping(bytes => mapping(uint256 => bytes))) public revertLookup; //[chainId][srcAddress][nonce]
    mapping(uint16 => mapping(bytes => mapping(uint256 => CachedSwap))) public cachedSwapLookup; //[chainId][srcAddress][nonce]
    //---------------------------------------------------------------------------
    // EVENTS
    event Revert(uint8 bridgeFunctionType, uint16 chainId, bytes srcAddress, uint256 nonce);
    event CachedSwapSaved(uint16 chainId, bytes srcAddress, uint256 nonce, address token, uint256 amountLD, address to, bytes payload, bytes reason);
    event RevertRedeemLocal(uint16 srcChainId, uint256 _srcPoolId, uint256 _dstPoolId, bytes to, uint256 redeemAmountSD, uint256 mintAmountSD, uint256 indexed nonce, bytes indexed srcAddress);
    event RedeemLocalCallback(uint16 srcChainId, bytes indexed srcAddress, uint256 indexed nonce, uint256 srcPoolId, uint256 dstPoolId, address to, uint256 amountSD, uint256 mintAmountSD);
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyBridge() {
        require(msg.sender == address(bridge), "Bridge: caller must be Bridge.");
        _;
    }
    constructor() {}
    function setBridgeAndFactory(Bridge _bridge, Factory _factory) external onlyOwner {
        require(address(bridge) == address(0x0) && address(factory) == address(0x0), "Stargate: bridge and factory already initialized"); // 1 time only
        require(address(_bridge) != address(0x0), "Stargate: bridge cant be 0x0");
        require(address(_factory) != address(0x0), "Stargate: factory cant be 0x0");
        bridge = _bridge;
        factory = _factory;
    }
    //---------------------------------------------------------------------------
    // VIEWS
    function _getPool(uint256 _poolId) internal view returns (Pool pool) {
        pool = factory.getPool(_poolId);
        require(address(pool) != address(0x0), "Stargate: Pool does not exist");
    }
    //---------------------------------------------------------------------------
    // INTERNAL
    function _safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) private {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "Stargate: TRANSFER_FROM_FAILED");
    }
    //---------------------------------------------------------------------------
    // LOCAL CHAIN FUNCTIONS
    function addLiquidity(
        uint256 _poolId,
        uint256 _amountLD,
        address _to
    ) external override nonReentrant {
        Pool pool = _getPool(_poolId);
        uint256 convertRate = pool.convertRate();
        _amountLD = _amountLD.div(convertRate).mul(convertRate);
        _safeTransferFrom(pool.token(), msg.sender, address(pool), _amountLD);
        pool.mint(_to, _amountLD);
    }
    function swap(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLD,
        uint256 _minAmountLD,
        lzTxObj memory _lzTxParams,
        bytes calldata _to,
        bytes calldata _payload
    ) external payable override nonReentrant {
        require(_amountLD > 0, "Stargate: cannot swap 0");
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        Pool.SwapObj memory s;
        Pool.CreditObj memory c;
        {
            Pool pool = _getPool(_srcPoolId);
            {
                uint256 convertRate = pool.convertRate();
                _amountLD = _amountLD.div(convertRate).mul(convertRate);
            }
            s = pool.swap(_dstChainId, _dstPoolId, msg.sender, _amountLD, _minAmountLD, true);
            _safeTransferFrom(pool.token(), msg.sender, address(pool), _amountLD);
            c = pool.sendCredits(_dstChainId, _dstPoolId);
        }
        bridge.swap{value: msg.value}(_dstChainId, _srcPoolId, _dstPoolId, _refundAddress, c, s, _lzTxParams, _to, _payload);
    }
    function redeemRemote(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        uint256 _minAmountLD,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable override nonReentrant {
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        require(_amountLP > 0, "Stargate: not enough lp to redeemRemote");
        Pool.SwapObj memory s;
        Pool.CreditObj memory c;
        {
            Pool pool = _getPool(_srcPoolId);
            uint256 amountLD = pool.amountLPtoLD(_amountLP);
            // perform a swap with no liquidity
            s = pool.swap(_dstChainId, _dstPoolId, msg.sender, amountLD, _minAmountLD, false);
            pool.redeemRemote(_dstChainId, _dstPoolId, msg.sender, _amountLP);
            c = pool.sendCredits(_dstChainId, _dstPoolId);
        }
        // equal to a swap, with no payload ("0x") no dstGasForCall 0
        bridge.swap{value: msg.value}(_dstChainId, _srcPoolId, _dstPoolId, _refundAddress, c, s, _lzTxParams, _to, "");
    }
    function instantRedeemLocal(
        uint16 _srcPoolId,
        uint256 _amountLP,
        address _to
    ) external override nonReentrant returns (uint256 amountSD) {
        require(_amountLP > 0, "Stargate: not enough lp to redeem");
        Pool pool = _getPool(_srcPoolId);
        amountSD = pool.instantRedeemLocal(msg.sender, _amountLP, _to);
    }
    function redeemLocal(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable override nonReentrant {
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        Pool pool = _getPool(_srcPoolId);
        require(_amountLP > 0, "Stargate: not enough lp to redeem");
        uint256 amountSD = pool.redeemLocal(msg.sender, _amountLP, _dstChainId, _dstPoolId, _to);
        require(amountSD > 0, "Stargate: not enough lp to redeem with amountSD");
        Pool.CreditObj memory c = pool.sendCredits(_dstChainId, _dstPoolId);
        bridge.redeemLocal{value: msg.value}(_dstChainId, _srcPoolId, _dstPoolId, _refundAddress, c, amountSD, _to, _lzTxParams);
    }
    function sendCredits(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress
    ) external payable override nonReentrant {
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        Pool pool = _getPool(_srcPoolId);
        Pool.CreditObj memory c = pool.sendCredits(_dstChainId, _dstPoolId);
        bridge.sendCredits{value: msg.value}(_dstChainId, _srcPoolId, _dstPoolId, _refundAddress, c);
    }
    function quoteLayerZeroFee(
        uint16 _dstChainId,
        uint8 _functionType,
        bytes calldata _toAddress,
        bytes calldata _transferAndCallPayload,
        Router.lzTxObj memory _lzTxParams
    ) external view override returns (uint256, uint256) {
        return bridge.quoteLayerZeroFee(_dstChainId, _functionType, _toAddress, _transferAndCallPayload, _lzTxParams);
    }
    function revertRedeemLocal(
        uint16 _dstChainId,
        bytes calldata _srcAddress,
        uint256 _nonce,
        address payable _refundAddress,
        lzTxObj memory _lzTxParams
    ) external payable {
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        bytes memory payload = revertLookup[_dstChainId][_srcAddress][_nonce];
        require(payload.length > 0, "Stargate: no retry revert");
        {
            uint8 functionType;
            assembly {
                functionType := mload(add(payload, 32))
            }
            require(functionType == TYPE_REDEEM_LOCAL_RESPONSE, "Stargate: invalid function type");
        }
        // empty it
        revertLookup[_dstChainId][_srcAddress][_nonce] = "";
        uint256 srcPoolId;
        uint256 dstPoolId;
        assembly {
            srcPoolId := mload(add(payload, 64))
            dstPoolId := mload(add(payload, 96))
        }
        Pool.CreditObj memory c;
        {
            Pool pool = _getPool(dstPoolId);
            c = pool.sendCredits(_dstChainId, srcPoolId);
        }
        bridge.redeemLocalCallback{value: msg.value}(_dstChainId, _refundAddress, c, _lzTxParams, payload);
    }
    function retryRevert(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        uint256 _nonce
    ) external payable {
        bytes memory payload = revertLookup[_srcChainId][_srcAddress][_nonce];
        require(payload.length > 0, "Stargate: no retry revert");
        // empty it
        revertLookup[_srcChainId][_srcAddress][_nonce] = "";
        uint8 functionType;
        assembly {
            functionType := mload(add(payload, 32))
        }
        if (functionType == TYPE_REDEEM_LOCAL_CALLBACK_RETRY) {
            (, uint256 srcPoolId, uint256 dstPoolId, address to, uint256 amountSD, uint256 mintAmountSD) = abi.decode(
                payload,
                (uint8, uint256, uint256, address, uint256, uint256)
            );
            _redeemLocalCallback(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, to, amountSD, mintAmountSD);
        }
        // for retrying the swapRemote. if it fails again, retry
        else if (functionType == TYPE_SWAP_REMOTE_RETRY) {
            (, uint256 srcPoolId, uint256 dstPoolId, uint256 dstGasForCall, address to, Pool.SwapObj memory s, bytes memory p) = abi.decode(
                payload,
                (uint8, uint256, uint256, uint256, address, Pool.SwapObj, bytes)
            );
            _swapRemote(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, dstGasForCall, to, s, p);
        } else {
            revert("Stargate: invalid function type");
        }
    }
    function clearCachedSwap(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        uint256 _nonce
    ) external {
        CachedSwap memory cs = cachedSwapLookup[_srcChainId][_srcAddress][_nonce];
        require(cs.to != address(0x0), "Stargate: cache already cleared");
        // clear the data
        cachedSwapLookup[_srcChainId][_srcAddress][_nonce] = CachedSwap(address(0x0), 0, address(0x0), "");
        IStargateReceiver(cs.to).sgReceive(_srcChainId, _srcAddress, _nonce, cs.token, cs.amountLD, cs.payload);
    }
    function creditChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint256 _srcPoolId,
        Pool.CreditObj memory _c
    ) external onlyBridge {
        Pool pool = _getPool(_srcPoolId);
        pool.creditChainPath(_dstChainId, _dstPoolId, _c);
    }
    //---------------------------------------------------------------------------
    // REMOTE CHAIN FUNCTIONS
    function redeemLocalCheckOnRemote(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint256 _amountSD,
        bytes calldata _to
    ) external onlyBridge {
        Pool pool = _getPool(_dstPoolId);
        try pool.redeemLocalCheckOnRemote(_srcChainId, _srcPoolId, _amountSD) returns (uint256 redeemAmountSD, uint256 mintAmountSD) {
            revertLookup[_srcChainId][_srcAddress][_nonce] = abi.encode(
                TYPE_REDEEM_LOCAL_RESPONSE,
                _srcPoolId,
                _dstPoolId,
                redeemAmountSD,
                mintAmountSD,
                _to
            );
            emit RevertRedeemLocal(_srcChainId, _srcPoolId, _dstPoolId, _to, redeemAmountSD, mintAmountSD, _nonce, _srcAddress);
        } catch {
            // if the func fail, return [swapAmount: 0, mintAMount: _amountSD]
            // swapAmount represents the amount of chainPath balance deducted on the remote side, which because the above tx failed, should be 0
            // mintAmount is the full amount of tokens the user attempted to redeem on the src side, which gets converted back into the lp amount
            revertLookup[_srcChainId][_srcAddress][_nonce] = abi.encode(TYPE_REDEEM_LOCAL_RESPONSE, _srcPoolId, _dstPoolId, 0, _amountSD, _to);
            emit Revert(TYPE_REDEEM_LOCAL_RESPONSE, _srcChainId, _srcAddress, _nonce);
        }
    }
    function redeemLocalCallback(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address _to,
        uint256 _amountSD,
        uint256 _mintAmountSD
    ) external onlyBridge {
        _redeemLocalCallback(_srcChainId, _srcAddress, _nonce, _srcPoolId, _dstPoolId, _to, _amountSD, _mintAmountSD);
    }
    function _redeemLocalCallback(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address _to,
        uint256 _amountSD,
        uint256 _mintAmountSD
    ) internal {
        Pool pool = _getPool(_dstPoolId);
        try pool.redeemLocalCallback(_srcChainId, _srcPoolId, _to, _amountSD, _mintAmountSD) {} catch {
            revertLookup[_srcChainId][_srcAddress][_nonce] = abi.encode(
                TYPE_REDEEM_LOCAL_CALLBACK_RETRY,
                _srcPoolId,
                _dstPoolId,
                _to,
                _amountSD,
                _mintAmountSD
            );
            emit Revert(TYPE_REDEEM_LOCAL_CALLBACK_RETRY, _srcChainId, _srcAddress, _nonce);
        }
        emit RedeemLocalCallback(_srcChainId, _srcAddress, _nonce, _srcPoolId, _dstPoolId, _to, _amountSD, _mintAmountSD);
    }
    function swapRemote(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint256 _dstGasForCall,
        address _to,
        Pool.SwapObj memory _s,
        bytes memory _payload
    ) external onlyBridge {
        _swapRemote(_srcChainId, _srcAddress, _nonce, _srcPoolId, _dstPoolId, _dstGasForCall, _to, _s, _payload);
    }
    function _swapRemote(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint256 _dstGasForCall,
        address _to,
        Pool.SwapObj memory _s,
        bytes memory _payload
    ) internal {
        Pool pool = _getPool(_dstPoolId);
        // first try catch the swap remote
        try pool.swapRemote(_srcChainId, _srcPoolId, _to, _s) returns (uint256 amountLD) {
            if (_payload.length > 0) {
                // then try catch the external contract call
                try IStargateReceiver(_to).sgReceive{gas: _dstGasForCall}(_srcChainId, _srcAddress, _nonce, pool.token(), amountLD, _payload) {
                    // do nothing
                } catch (bytes memory reason) {
                    cachedSwapLookup[_srcChainId][_srcAddress][_nonce] = CachedSwap(pool.token(), amountLD, _to, _payload);
                    emit CachedSwapSaved(_srcChainId, _srcAddress, _nonce, pool.token(), amountLD, _to, _payload, reason);
                }
            }
        } catch {
            revertLookup[_srcChainId][_srcAddress][_nonce] = abi.encode(
                TYPE_SWAP_REMOTE_RETRY,
                _srcPoolId,
                _dstPoolId,
                _dstGasForCall,
                _to,
                _s,
                _payload
            );
            emit Revert(TYPE_SWAP_REMOTE_RETRY, _srcChainId, _srcAddress, _nonce);
        }
    }
    //---------------------------------------------------------------------------
    // DAO Calls
    function createPool(
        uint256 _poolId,
        address _token,
        uint8 _sharedDecimals,
        uint8 _localDecimals,
        string memory _name,
        string memory _symbol
    ) external onlyOwner returns (address) {
        require(_token != address(0x0), "Stargate: _token cannot be 0x0");
        return factory.createPool(_poolId, _token, _sharedDecimals, _localDecimals, _name, _symbol);
    }
    function createChainPath(
        uint256 _poolId,
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint256 _weight
    ) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.createChainPath(_dstChainId, _dstPoolId, _weight);
    }
    function activateChainPath(
        uint256 _poolId,
        uint16 _dstChainId,
        uint256 _dstPoolId
    ) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.activateChainPath(_dstChainId, _dstPoolId);
    }
    function setWeightForChainPath(
        uint256 _poolId,
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint16 _weight
    ) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setWeightForChainPath(_dstChainId, _dstPoolId, _weight);
    }
    function setProtocolFeeOwner(address _owner) external onlyOwner {
        require(_owner != address(0x0), "Stargate: _owner cannot be 0x0");
        protocolFeeOwner = _owner;
    }
    function setMintFeeOwner(address _owner) external onlyOwner {
        require(_owner != address(0x0), "Stargate: _owner cannot be 0x0");
        mintFeeOwner = _owner;
    }
    function setFees(uint256 _poolId, uint256 _mintFeeBP) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setFee(_mintFeeBP);
    }
    function setFeeLibrary(uint256 _poolId, address _feeLibraryAddr) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setFeeLibrary(_feeLibraryAddr);
    }
    function setSwapStop(uint256 _poolId, bool _swapStop) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setSwapStop(_swapStop);
    }
    function setDeltaParam(
        uint256 _poolId,
        bool _batched,
        uint256 _swapDeltaBP,
        uint256 _lpDeltaBP,
        bool _defaultSwapMode,
        bool _defaultLPMode
    ) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setDeltaParam(_batched, _swapDeltaBP, _lpDeltaBP, _defaultSwapMode, _defaultLPMode);
    }
    function callDelta(uint256 _poolId, bool _fullMode) external {
        Pool pool = _getPool(_poolId);
        pool.callDelta(_fullMode);
    }
    function withdrawMintFee(uint256 _poolId, address _to) external {
        require(mintFeeOwner == msg.sender, "Stargate: only mintFeeOwner");
        Pool pool = _getPool(_poolId);
        pool.withdrawMintFeeBalance(_to);
    }
    function withdrawProtocolFee(uint256 _poolId, address _to) external {
        require(protocolFeeOwner == msg.sender, "Stargate: only protocolFeeOwner");
        Pool pool = _getPool(_poolId);
        pool.withdrawProtocolFeeBalance(_to);
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    constructor () {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./Pool.sol";
contract Factory is Ownable {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // VARIABLES
    mapping(uint256 => Pool) public getPool; // poolId -> PoolInfo
    address[] public allPools;
    address public immutable router;
    address public defaultFeeLibrary; // address for retrieving fee params for swaps
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == router, "Stargate: caller must be Router.");
        _;
    }
    constructor(address _router) {
        require(_router != address(0x0), "Stargate: _router cant be 0x0"); // 1 time only
        router = _router;
    }
    function setDefaultFeeLibrary(address _defaultFeeLibrary) external onlyOwner {
        require(_defaultFeeLibrary != address(0x0), "Stargate: fee library cant be 0x0");
        defaultFeeLibrary = _defaultFeeLibrary;
    }
    function allPoolsLength() external view returns (uint256) {
        return allPools.length;
    }
    function createPool(
        uint256 _poolId,
        address _token,
        uint8 _sharedDecimals,
        uint8 _localDecimals,
        string memory _name,
        string memory _symbol
    ) public onlyRouter returns (address poolAddress) {
        require(address(getPool[_poolId]) == address(0x0), "Stargate: Pool already created");
        Pool pool = new Pool(_poolId, router, _token, _sharedDecimals, _localDecimals, defaultFeeLibrary, _name, _symbol);
        getPool[_poolId] = pool;
        poolAddress = address(pool);
        allPools.push(poolAddress);
    }
    function renounceOwnership() public override onlyOwner {}
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
// imports
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./LPTokenERC20.sol";
import "./interfaces/IStargateFeeLibrary.sol";
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
/// Pool contracts on other chains and managed by the Stargate protocol.
contract Pool is LPTokenERC20, ReentrancyGuard {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)")));
    uint256 public constant BP_DENOMINATOR = 10000;
    //---------------------------------------------------------------------------
    // STRUCTS
    struct ChainPath {
        bool ready; // indicate if the counter chainPath has been created.
        uint16 dstChainId;
        uint256 dstPoolId;
        uint256 weight;
        uint256 balance;
        uint256 lkb;
        uint256 credits;
        uint256 idealBalance;
    }
    struct SwapObj {
        uint256 amount;
        uint256 eqFee;
        uint256 eqReward;
        uint256 lpFee;
        uint256 protocolFee;
        uint256 lkbRemove;
    }
    struct CreditObj {
        uint256 credits;
        uint256 idealBalance;
    }
    //---------------------------------------------------------------------------
    // VARIABLES
    // chainPath
    ChainPath[] public chainPaths; // list of connected chains with shared pools
    mapping(uint16 => mapping(uint256 => uint256)) public chainPathIndexLookup; // lookup for chainPath by chainId => poolId =>index
    // metadata
    uint256 public immutable poolId; // shared id between chains to represent same pool
    uint256 public sharedDecimals; // the shared decimals (lowest common decimals between chains)
    uint256 public localDecimals; // the decimals for the token
    uint256 public immutable convertRate; // the decimals for the token
    address public immutable token; // the token for the pool
    address public immutable router; // the token for the pool
    bool public stopSwap; // flag to stop swapping in extreme cases
    // Fee and Liquidity
    uint256 public totalLiquidity; // the total amount of tokens added on this side of the chain (fees + deposits - withdrawals)
    uint256 public totalWeight; // total weight for pool percentages
    uint256 public mintFeeBP; // fee basis points for the mint/deposit
    uint256 public protocolFeeBalance; // fee balance created from dao fee
    uint256 public mintFeeBalance; // fee balance created from mint fee
    uint256 public eqFeePool; // pool rewards in Shared Decimal format. indicate the total budget for reverse swap incentive
    address public feeLibrary; // address for retrieving fee params for swaps
    // Delta related
    uint256 public deltaCredit; // credits accumulated from txn
    bool public batched; // flag to indicate if we want batch processing.
    bool public defaultSwapMode; // flag for the default mode for swap
    bool public defaultLPMode; // flag for the default mode for lp
    uint256 public swapDeltaBP; // basis points of poolCredits to activate Delta in swap
    uint256 public lpDeltaBP; // basis points of poolCredits to activate Delta in liquidity events
    //---------------------------------------------------------------------------
    // EVENTS
    event Mint(address to, uint256 amountLP, uint256 amountSD, uint256 mintFeeAmountSD);
    event Burn(address from, uint256 amountLP, uint256 amountSD);
    event RedeemLocalCallback(address _to, uint256 _amountSD, uint256 _amountToMintSD);
    event Swap(
        uint16 chainId,
        uint256 dstPoolId,
        address from,
        uint256 amountSD,
        uint256 eqReward,
        uint256 eqFee,
        uint256 protocolFee,
        uint256 lpFee
    );
    event SendCredits(uint16 dstChainId, uint256 dstPoolId, uint256 credits, uint256 idealBalance);
    event RedeemRemote(uint16 chainId, uint256 dstPoolId, address from, uint256 amountLP, uint256 amountSD);
    event RedeemLocal(address from, uint256 amountLP, uint256 amountSD, uint16 chainId, uint256 dstPoolId, bytes to);
    event InstantRedeemLocal(address from, uint256 amountLP, uint256 amountSD, address to);
    event CreditChainPath(uint16 chainId, uint256 srcPoolId, uint256 amountSD, uint256 idealBalance);
    event SwapRemote(address to, uint256 amountSD, uint256 protocolFee, uint256 dstFee);
    event WithdrawRemote(uint16 srcChainId, uint256 srcPoolId, uint256 swapAmount, uint256 mintAmount);
    event ChainPathUpdate(uint16 dstChainId, uint256 dstPoolId, uint256 weight);
    event FeesUpdated(uint256 mintFeeBP);
    event FeeLibraryUpdated(address feeLibraryAddr);
    event StopSwapUpdated(bool swapStop);
    event WithdrawProtocolFeeBalance(address to, uint256 amountSD);
    event WithdrawMintFeeBalance(address to, uint256 amountSD);
    event DeltaParamUpdated(bool batched, uint256 swapDeltaBP, uint256 lpDeltaBP, bool defaultSwapMode, bool defaultLPMode);
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == router, "Stargate: only the router can call this method");
        _;
    }
    constructor(
        uint256 _poolId,
        address _router,
        address _token,
        uint256 _sharedDecimals,
        uint256 _localDecimals,
        address _feeLibrary,
        string memory _name,
        string memory _symbol
    ) LPTokenERC20(_name, _symbol) {
        require(_token != address(0x0), "Stargate: _token cannot be 0x0");
        require(_router != address(0x0), "Stargate: _router cannot be 0x0");
        poolId = _poolId;
        router = _router;
        token = _token;
        sharedDecimals = _sharedDecimals;
        decimals = uint8(_sharedDecimals);
        localDecimals = _localDecimals;
        convertRate = 10**(uint256(localDecimals).sub(sharedDecimals));
        totalWeight = 0;
        feeLibrary = _feeLibrary;
        //delta algo related
        batched = false;
        defaultSwapMode = true;
        defaultLPMode = true;
    }
    function getChainPathsLength() public view returns (uint256) {
        return chainPaths.length;
    }
    //---------------------------------------------------------------------------
    // LOCAL CHAIN FUNCTIONS
    function mint(address _to, uint256 _amountLD) external nonReentrant onlyRouter returns (uint256) {
        return _mintLocal(_to, _amountLD, true, true);
    }
    // Local                                    Remote
    // -------                                  ---------
    // swap             ->                      swapRemote
    function swap(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        address _from,
        uint256 _amountLD,
        uint256 _minAmountLD,
        bool newLiquidity
    ) external nonReentrant onlyRouter returns (SwapObj memory) {
        require(!stopSwap, "Stargate: swap func stopped");
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == true, "Stargate: counter chainPath is not ready");
        uint256 amountSD = amountLDtoSD(_amountLD);
        uint256 minAmountSD = amountLDtoSD(_minAmountLD);
        // request fee params from library
        SwapObj memory s = IStargateFeeLibrary(feeLibrary).getFees(poolId, _dstPoolId, _dstChainId, _from, amountSD);
        // equilibrium fee and reward. note eqFee/eqReward are separated from swap liquidity
        eqFeePool = eqFeePool.sub(s.eqReward);
        // update the new amount the user gets minus the fees
        s.amount = amountSD.sub(s.eqFee).sub(s.protocolFee).sub(s.lpFee);
        // users will also get the eqReward
        require(s.amount.add(s.eqReward) >= minAmountSD, "Stargate: slippage too high");
        // behaviours
        //     - protocolFee: booked, stayed and withdrawn at remote.
        //     - eqFee: booked, stayed and withdrawn at remote.
        //     - lpFee: booked and stayed at remote, can be withdrawn anywhere
        s.lkbRemove = amountSD.sub(s.lpFee).add(s.eqReward);
        // check for transfer solvency.
        require(cp.balance >= s.lkbRemove, "Stargate: dst balance too low");
        cp.balance = cp.balance.sub(s.lkbRemove);
        if (newLiquidity) {
            deltaCredit = deltaCredit.add(amountSD).add(s.eqReward);
        } else if (s.eqReward > 0) {
            deltaCredit = deltaCredit.add(s.eqReward);
        }
        // distribute credits on condition.
        if (!batched || deltaCredit >= totalLiquidity.mul(swapDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultSwapMode);
        }
        emit Swap(_dstChainId, _dstPoolId, _from, s.amount, s.eqReward, s.eqFee, s.protocolFee, s.lpFee);
        return s;
    }
    // Local                                    Remote
    // -------                                  ---------
    // sendCredits      ->                      creditChainPath
    function sendCredits(uint16 _dstChainId, uint256 _dstPoolId) external nonReentrant onlyRouter returns (CreditObj memory c) {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == true, "Stargate: counter chainPath is not ready");
        cp.lkb = cp.lkb.add(cp.credits);
        c.idealBalance = totalLiquidity.mul(cp.weight).div(totalWeight);
        c.credits = cp.credits;
        cp.credits = 0;
        emit SendCredits(_dstChainId, _dstPoolId, c.credits, c.idealBalance);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemRemote   ->                        swapRemote
    function redeemRemote(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        address _from,
        uint256 _amountLP
    ) external nonReentrant onlyRouter {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        uint256 amountSD = _burnLocal(_from, _amountLP);
        //run Delta
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultLPMode);
        }
        uint256 amountLD = amountSDtoLD(amountSD);
        emit RedeemRemote(_dstChainId, _dstPoolId, _from, _amountLP, amountLD);
    }
    function instantRedeemLocal(
        address _from,
        uint256 _amountLP,
        address _to
    ) external nonReentrant onlyRouter returns (uint256 amountSD) {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        uint256 _deltaCredit = deltaCredit; // sload optimization.
        uint256 _capAmountLP = _amountSDtoLP(_deltaCredit);
        if (_amountLP > _capAmountLP) _amountLP = _capAmountLP;
        amountSD = _burnLocal(_from, _amountLP);
        deltaCredit = _deltaCredit.sub(amountSD);
        uint256 amountLD = amountSDtoLD(amountSD);
        _safeTransfer(token, _to, amountLD);
        emit InstantRedeemLocal(_from, _amountLP, amountSD, _to);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal   ->                         redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocal(
        address _from,
        uint256 _amountLP,
        uint16 _dstChainId,
        uint256 _dstPoolId,
        bytes calldata _to
    ) external nonReentrant onlyRouter returns (uint256 amountSD) {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        // safeguard.
        require(chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]].ready == true, "Stargate: counter chainPath is not ready");
        amountSD = _burnLocal(_from, _amountLP);
        // run Delta
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(false);
        }
        emit RedeemLocal(_from, _amountLP, amountSD, _dstChainId, _dstPoolId, _to);
    }
    //---------------------------------------------------------------------------
    // REMOTE CHAIN FUNCTIONS
    // Local                                    Remote
    // -------                                  ---------
    // sendCredits      ->                      creditChainPath
    function creditChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        CreditObj memory _c
    ) external nonReentrant onlyRouter {
        ChainPath storage cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        cp.balance = cp.balance.add(_c.credits);
        if (cp.idealBalance != _c.idealBalance) {
            cp.idealBalance = _c.idealBalance;
        }
        emit CreditChainPath(_dstChainId, _dstPoolId, _c.credits, _c.idealBalance);
    }
    // Local                                    Remote
    // -------                                  ---------
    // swap             ->                      swapRemote
    function swapRemote(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        address _to,
        SwapObj memory _s
    ) external nonReentrant onlyRouter returns (uint256 amountLD) {
        // booking lpFee
        totalLiquidity = totalLiquidity.add(_s.lpFee);
        // booking eqFee
        eqFeePool = eqFeePool.add(_s.eqFee);
        // booking stargateFee
        protocolFeeBalance = protocolFeeBalance.add(_s.protocolFee);
        // update LKB
        uint256 chainPathIndex = chainPathIndexLookup[_srcChainId][_srcPoolId];
        chainPaths[chainPathIndex].lkb = chainPaths[chainPathIndex].lkb.sub(_s.lkbRemove);
        // user receives the amount + the srcReward
        amountLD = amountSDtoLD(_s.amount.add(_s.eqReward));
        _safeTransfer(token, _to, amountLD);
        emit SwapRemote(_to, _s.amount.add(_s.eqReward), _s.protocolFee, _s.eqFee);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal   ->                         redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocalCallback(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        address _to,
        uint256 _amountSD,
        uint256 _amountToMintSD
    ) external nonReentrant onlyRouter {
        if (_amountToMintSD > 0) {
            _mintLocal(_to, amountSDtoLD(_amountToMintSD), false, false);
        }
        ChainPath storage cp = getAndCheckCP(_srcChainId, _srcPoolId);
        cp.lkb = cp.lkb.sub(_amountSD);
        uint256 amountLD = amountSDtoLD(_amountSD);
        _safeTransfer(token, _to, amountLD);
        emit RedeemLocalCallback(_to, _amountSD, _amountToMintSD);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal(amount)   ->               redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocalCheckOnRemote(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        uint256 _amountSD
    ) external nonReentrant onlyRouter returns (uint256 swapAmount, uint256 mintAmount) {
        ChainPath storage cp = getAndCheckCP(_srcChainId, _srcPoolId);
        if (_amountSD > cp.balance) {
            mintAmount = _amountSD - cp.balance;
            swapAmount = cp.balance;
            cp.balance = 0;
        } else {
            cp.balance = cp.balance.sub(_amountSD);
            swapAmount = _amountSD;
            mintAmount = 0;
        }
        emit WithdrawRemote(_srcChainId, _srcPoolId, swapAmount, mintAmount);
    }
    //---------------------------------------------------------------------------
    // DAO Calls
    function createChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint256 _weight
    ) external onlyRouter {
        for (uint256 i = 0; i < chainPaths.length; ++i) {
            ChainPath memory cp = chainPaths[i];
            bool exists = cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId;
            require(!exists, "Stargate: cant createChainPath of existing dstChainId and _dstPoolId");
        }
        totalWeight = totalWeight.add(_weight);
        chainPathIndexLookup[_dstChainId][_dstPoolId] = chainPaths.length;
        chainPaths.push(ChainPath(false, _dstChainId, _dstPoolId, _weight, 0, 0, 0, 0));
        emit ChainPathUpdate(_dstChainId, _dstPoolId, _weight);
    }
    function setWeightForChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint16 _weight
    ) external onlyRouter {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        totalWeight = totalWeight.sub(cp.weight).add(_weight);
        cp.weight = _weight;
        emit ChainPathUpdate(_dstChainId, _dstPoolId, _weight);
    }
    function setFee(uint256 _mintFeeBP) external onlyRouter {
        require(_mintFeeBP <= BP_DENOMINATOR, "Bridge: cum fees > 100%");
        mintFeeBP = _mintFeeBP;
        emit FeesUpdated(mintFeeBP);
    }
    function setFeeLibrary(address _feeLibraryAddr) external onlyRouter {
        require(_feeLibraryAddr != address(0x0), "Stargate: fee library cant be 0x0");
        feeLibrary = _feeLibraryAddr;
        emit FeeLibraryUpdated(_feeLibraryAddr);
    }
    function setSwapStop(bool _swapStop) external onlyRouter {
        stopSwap = _swapStop;
        emit StopSwapUpdated(_swapStop);
    }
    function setDeltaParam(
        bool _batched,
        uint256 _swapDeltaBP,
        uint256 _lpDeltaBP,
        bool _defaultSwapMode,
        bool _defaultLPMode
    ) external onlyRouter {
        require(_swapDeltaBP <= BP_DENOMINATOR && _lpDeltaBP <= BP_DENOMINATOR, "Stargate: wrong Delta param");
        batched = _batched;
        swapDeltaBP = _swapDeltaBP;
        lpDeltaBP = _lpDeltaBP;
        defaultSwapMode = _defaultSwapMode;
        defaultLPMode = _defaultLPMode;
        emit DeltaParamUpdated(_batched, _swapDeltaBP, _lpDeltaBP, _defaultSwapMode, _defaultLPMode);
    }
    function callDelta(bool _fullMode) external onlyRouter {
        _delta(_fullMode);
    }
    function activateChainPath(uint16 _dstChainId, uint256 _dstPoolId) external onlyRouter {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == false, "Stargate: chainPath is already active");
        // this func will only be called once
        cp.ready = true;
    }
    function withdrawProtocolFeeBalance(address _to) external onlyRouter {
        if (protocolFeeBalance > 0) {
            uint256 amountOfLD = amountSDtoLD(protocolFeeBalance);
            protocolFeeBalance = 0;
            _safeTransfer(token, _to, amountOfLD);
            emit WithdrawProtocolFeeBalance(_to, amountOfLD);
        }
    }
    function withdrawMintFeeBalance(address _to) external onlyRouter {
        if (mintFeeBalance > 0) {
            uint256 amountOfLD = amountSDtoLD(mintFeeBalance);
            mintFeeBalance = 0;
            _safeTransfer(token, _to, amountOfLD);
            emit WithdrawMintFeeBalance(_to, amountOfLD);
        }
    }
    //---------------------------------------------------------------------------
    // INTERNAL
    // Conversion Helpers
    //---------------------------------------------------------------------------
    function amountLPtoLD(uint256 _amountLP) external view returns (uint256) {
        return amountSDtoLD(_amountLPtoSD(_amountLP));
    }
    function _amountLPtoSD(uint256 _amountLP) internal view returns (uint256) {
        require(totalSupply > 0, "Stargate: cant convert LPtoSD when totalSupply == 0");
        return _amountLP.mul(totalLiquidity).div(totalSupply);
    }
    function _amountSDtoLP(uint256 _amountSD) internal view returns (uint256) {
        require(totalLiquidity > 0, "Stargate: cant convert SDtoLP when totalLiq == 0");
        return _amountSD.mul(totalSupply).div(totalLiquidity);
    }
    function amountSDtoLD(uint256 _amount) internal view returns (uint256) {
        return _amount.mul(convertRate);
    }
    function amountLDtoSD(uint256 _amount) internal view returns (uint256) {
        return _amount.div(convertRate);
    }
    function getAndCheckCP(uint16 _dstChainId, uint256 _dstPoolId) internal view returns (ChainPath storage) {
        require(chainPaths.length > 0, "Stargate: no chainpaths exist");
        ChainPath storage cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        require(cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId, "Stargate: local chainPath does not exist");
        return cp;
    }
    function getChainPath(uint16 _dstChainId, uint256 _dstPoolId) external view returns (ChainPath memory) {
        ChainPath memory cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        require(cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId, "Stargate: local chainPath does not exist");
        return cp;
    }
    function _burnLocal(address _from, uint256 _amountLP) internal returns (uint256) {
        require(totalSupply > 0, "Stargate: cant burn when totalSupply == 0");
        uint256 amountOfLPTokens = balanceOf[_from];
        require(amountOfLPTokens >= _amountLP, "Stargate: not enough LP tokens to burn");
        uint256 amountSD = _amountLP.mul(totalLiquidity).div(totalSupply);
        //subtract totalLiquidity accordingly
        totalLiquidity = totalLiquidity.sub(amountSD);
        _burn(_from, _amountLP);
        emit Burn(_from, _amountLP, amountSD);
        return amountSD;
    }
    function _delta(bool fullMode) internal {
        if (deltaCredit > 0 && totalWeight > 0) {
            uint256 cpLength = chainPaths.length;
            uint256[] memory deficit = new uint256[](cpLength);
            uint256 totalDeficit = 0;
            // algorithm steps 6-9: calculate the total and the amounts required to get to balance state
            for (uint256 i = 0; i < cpLength; ++i) {
                ChainPath storage cp = chainPaths[i];
                // (liquidity * (weight/totalWeight)) - (lkb+credits)
                uint256 balLiq = totalLiquidity.mul(cp.weight).div(totalWeight);
                uint256 currLiq = cp.lkb.add(cp.credits);
                if (balLiq > currLiq) {
                    // save gas since we know balLiq > currLiq and we know deficit[i] > 0
                    deficit[i] = balLiq - currLiq;
                    totalDeficit = totalDeficit.add(deficit[i]);
                }
            }
            // indicates how much delta credit is distributed
            uint256 spent;
            // handle credits with 2 tranches. the [ < totalDeficit] [excessCredit]
            // run full Delta, allocate all credits
            if (totalDeficit == 0) {
                // only fullMode delta will allocate excess credits
                if (fullMode && deltaCredit > 0) {
                    // credit ChainPath by weights
                    for (uint256 i = 0; i < cpLength; ++i) {
                        ChainPath storage cp = chainPaths[i];
                        // credits = credits + toBalanceChange + remaining allocation based on weight
                        uint256 amtToCredit = deltaCredit.mul(cp.weight).div(totalWeight);
                        spent = spent.add(amtToCredit);
                        cp.credits = cp.credits.add(amtToCredit);
                    }
                } // else do nth
            } else if (totalDeficit <= deltaCredit) {
                if (fullMode) {
                    // algorithm step 13: calculate amount to disperse to bring to balance state or as close as possible
                    uint256 excessCredit = deltaCredit - totalDeficit;
                    // algorithm steps 14-16: calculate credits
                    for (uint256 i = 0; i < cpLength; ++i) {
                        if (deficit[i] > 0) {
                            ChainPath storage cp = chainPaths[i];
                            // credits = credits + deficit + remaining allocation based on weight
                            uint256 amtToCredit = deficit[i].add(excessCredit.mul(cp.weight).div(totalWeight));
                            spent = spent.add(amtToCredit);
                            cp.credits = cp.credits.add(amtToCredit);
                        }
                    }
                } else {
                    // totalDeficit <= deltaCredit but not running fullMode
                    // credit chainPaths as is if any deficit, not using all deltaCredit
                    for (uint256 i = 0; i < cpLength; ++i) {
                        if (deficit[i] > 0) {
                            ChainPath storage cp = chainPaths[i];
                            uint256 amtToCredit = deficit[i];
                            spent = spent.add(amtToCredit);
                            cp.credits = cp.credits.add(amtToCredit);
                        }
                    }
                }
            } else {
                // totalDeficit > deltaCredit, fullMode or not, normalize the deficit by deltaCredit
                for (uint256 i = 0; i < cpLength; ++i) {
                    if (deficit[i] > 0) {
                        ChainPath storage cp = chainPaths[i];
                        uint256 proportionalDeficit = deficit[i].mul(deltaCredit).div(totalDeficit);
                        spent = spent.add(proportionalDeficit);
                        cp.credits = cp.credits.add(proportionalDeficit);
                    }
                }
            }
            // deduct the amount of credit sent
            deltaCredit = deltaCredit.sub(spent);
        }
    }
    function _mintLocal(
        address _to,
        uint256 _amountLD,
        bool _feesEnabled,
        bool _creditDelta
    ) internal returns (uint256 amountSD) {
        require(totalWeight > 0, "Stargate: No ChainPaths exist");
        amountSD = amountLDtoSD(_amountLD);
        uint256 mintFeeSD = 0;
        if (_feesEnabled) {
            mintFeeSD = amountSD.mul(mintFeeBP).div(BP_DENOMINATOR);
            amountSD = amountSD.sub(mintFeeSD);
            mintFeeBalance = mintFeeBalance.add(mintFeeSD);
        }
        if (_creditDelta) {
            deltaCredit = deltaCredit.add(amountSD);
        }
        uint256 amountLPTokens = amountSD;
        if (totalSupply != 0) {
            amountLPTokens = amountSD.mul(totalSupply).div(totalLiquidity);
        }
        totalLiquidity = totalLiquidity.add(amountSD);
        _mint(_to, amountLPTokens);
        emit Mint(_to, amountLPTokens, amountSD, mintFeeSD);
        // add to credits and call delta. short circuit to save gas
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultLPMode);
        }
    }
    function _safeTransfer(
        address _token,
        address _to,
        uint256 _value
    ) private {
        (bool success, bytes memory data) = _token.call(abi.encodeWithSelector(SELECTOR, _to, _value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "Stargate: TRANSFER_FAILED");
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
// imports
import "@openzeppelin/contracts/access/Ownable.sol";
import "./Pool.sol";
import "./Router.sol";
// interfaces
import "@layerzerolabs/contracts/contracts/interfaces/ILayerZeroReceiver.sol";
import "@layerzerolabs/contracts/contracts/interfaces/ILayerZeroEndpoint.sol";
import "@layerzerolabs/contracts/contracts/interfaces/ILayerZeroUserApplicationConfig.sol";
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
contract Bridge is Ownable, ILayerZeroReceiver, ILayerZeroUserApplicationConfig {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    uint8 internal constant TYPE_SWAP_REMOTE = 1;
    uint8 internal constant TYPE_ADD_LIQUIDITY = 2;
    uint8 internal constant TYPE_REDEEM_LOCAL_CALL_BACK = 3;
    uint8 internal constant TYPE_WITHDRAW_REMOTE = 4;
    //---------------------------------------------------------------------------
    // VARIABLES
    ILayerZeroEndpoint public immutable layerZeroEndpoint;
    mapping(uint16 => bytes) public bridgeLookup;
    mapping(uint16 => mapping(uint8 => uint256)) public gasLookup;
    Router public immutable router;
    bool public useLayerZeroToken;
    //---------------------------------------------------------------------------
    // EVENTS
    event SendMsg(uint8 msgType, uint64 nonce);
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == address(router), "Stargate: caller must be Router.");
        _;
    }
    constructor(address _layerZeroEndpoint, address _router) {
        require(_layerZeroEndpoint != address(0x0), "Stargate: _layerZeroEndpoint cannot be 0x0");
        require(_router != address(0x0), "Stargate: _router cannot be 0x0");
        layerZeroEndpoint = ILayerZeroEndpoint(_layerZeroEndpoint);
        router = Router(_router);
    }
    //---------------------------------------------------------------------------
    // EXTERNAL functions
    function lzReceive(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload
    ) external override {
        require(msg.sender == address(layerZeroEndpoint), "Stargate: only LayerZero endpoint can call lzReceive");
        require(
            _srcAddress.length == bridgeLookup[_srcChainId].length && keccak256(_srcAddress) == keccak256(bridgeLookup[_srcChainId]),
            "Stargate: bridge does not match"
        );
        uint8 functionType;
        assembly {
            functionType := mload(add(_payload, 32))
        }
        if (functionType == TYPE_SWAP_REMOTE) {
            (
                ,
                uint256 srcPoolId,
                uint256 dstPoolId,
                uint256 dstGasForCall,
                Pool.CreditObj memory c,
                Pool.SwapObj memory s,
                bytes memory to,
                bytes memory payload
            ) = abi.decode(_payload, (uint8, uint256, uint256, uint256, Pool.CreditObj, Pool.SwapObj, bytes, bytes));
            address toAddress;
            assembly {
                toAddress := mload(add(to, 20))
            }
            router.creditChainPath(_srcChainId, srcPoolId, dstPoolId, c);
            router.swapRemote(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, dstGasForCall, toAddress, s, payload);
        } else if (functionType == TYPE_ADD_LIQUIDITY) {
            (, uint256 srcPoolId, uint256 dstPoolId, Pool.CreditObj memory c) = abi.decode(_payload, (uint8, uint256, uint256, Pool.CreditObj));
            router.creditChainPath(_srcChainId, srcPoolId, dstPoolId, c);
        } else if (functionType == TYPE_REDEEM_LOCAL_CALL_BACK) {
            (, uint256 srcPoolId, uint256 dstPoolId, Pool.CreditObj memory c, uint256 amountSD, uint256 mintAmountSD, bytes memory to) = abi
                .decode(_payload, (uint8, uint256, uint256, Pool.CreditObj, uint256, uint256, bytes));
            address toAddress;
            assembly {
                toAddress := mload(add(to, 20))
            }
            router.creditChainPath(_srcChainId, srcPoolId, dstPoolId, c);
            router.redeemLocalCallback(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, toAddress, amountSD, mintAmountSD);
        } else if (functionType == TYPE_WITHDRAW_REMOTE) {
            (, uint256 srcPoolId, uint256 dstPoolId, Pool.CreditObj memory c, uint256 amountSD, bytes memory to) = abi.decode(
                _payload,
                (uint8, uint256, uint256, Pool.CreditObj, uint256, bytes)
            );
            router.creditChainPath(_srcChainId, srcPoolId, dstPoolId, c);
            router.redeemLocalCheckOnRemote(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, amountSD, to);
        }
    }
    //---------------------------------------------------------------------------
    // LOCAL CHAIN FUNCTIONS
    function swap(
        uint16 _chainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        Pool.CreditObj memory _c,
        Pool.SwapObj memory _s,
        IStargateRouter.lzTxObj memory _lzTxParams,
        bytes calldata _to,
        bytes calldata _payload
    ) external payable onlyRouter {
        bytes memory payload = abi.encode(TYPE_SWAP_REMOTE, _srcPoolId, _dstPoolId, _lzTxParams.dstGasForCall, _c, _s, _to, _payload);
        _call(_chainId, TYPE_SWAP_REMOTE, _refundAddress, _lzTxParams, payload);
    }
    function redeemLocalCallback(
        uint16 _chainId,
        address payable _refundAddress,
        Pool.CreditObj memory _c,
        IStargateRouter.lzTxObj memory _lzTxParams,
        bytes memory _payload
    ) external payable onlyRouter {
        bytes memory payload;
        {
            (, uint256 srcPoolId, uint256 dstPoolId, uint256 amountSD, uint256 mintAmountSD, bytes memory to) = abi.decode(
                _payload,
                (uint8, uint256, uint256, uint256, uint256, bytes)
            );
            // swap dst and src because we are headed back
            payload = abi.encode(TYPE_REDEEM_LOCAL_CALL_BACK, dstPoolId, srcPoolId, _c, amountSD, mintAmountSD, to);
        }
        _call(_chainId, TYPE_REDEEM_LOCAL_CALL_BACK, _refundAddress, _lzTxParams, payload);
    }
    function redeemLocal(
        uint16 _chainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        Pool.CreditObj memory _c,
        uint256 _amountSD,
        bytes calldata _to,
        IStargateRouter.lzTxObj memory _lzTxParams
    ) external payable onlyRouter {
        bytes memory payload = abi.encode(TYPE_WITHDRAW_REMOTE, _srcPoolId, _dstPoolId, _c, _amountSD, _to);
        _call(_chainId, TYPE_WITHDRAW_REMOTE, _refundAddress, _lzTxParams, payload);
    }
    function sendCredits(
        uint16 _chainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        Pool.CreditObj memory _c
    ) external payable onlyRouter {
        bytes memory payload = abi.encode(TYPE_ADD_LIQUIDITY, _srcPoolId, _dstPoolId, _c);
        IStargateRouter.lzTxObj memory lzTxObj = IStargateRouter.lzTxObj(0, 0, "0x");
        _call(_chainId, TYPE_ADD_LIQUIDITY, _refundAddress, lzTxObj, payload);
    }
    function quoteLayerZeroFee(
        uint16 _chainId,
        uint8 _functionType,
        bytes calldata _toAddress,
        bytes calldata _transferAndCallPayload,
        IStargateRouter.lzTxObj memory _lzTxParams
    ) external view returns (uint256, uint256) {
        bytes memory payload = "";
        Pool.CreditObj memory c = Pool.CreditObj(1, 1);
        if (_functionType == TYPE_SWAP_REMOTE) {
            Pool.SwapObj memory s = Pool.SwapObj(1, 1, 1, 1, 1, 1);
            payload = abi.encode(TYPE_SWAP_REMOTE, 0, 0, 0, c, s, _toAddress, _transferAndCallPayload);
        } else if (_functionType == TYPE_ADD_LIQUIDITY) {
            payload = abi.encode(TYPE_ADD_LIQUIDITY, 0, 0, c);
        } else if (_functionType == TYPE_REDEEM_LOCAL_CALL_BACK) {
            payload = abi.encode(TYPE_REDEEM_LOCAL_CALL_BACK, 0, 0, c, 0, 0, _toAddress);
        } else if (_functionType == TYPE_WITHDRAW_REMOTE) {
            payload = abi.encode(TYPE_WITHDRAW_REMOTE, 0, 0, c, 0, _toAddress);
        } else {
            revert("Stargate: unsupported function type");
        }
        bytes memory lzTxParamBuilt = _txParamBuilder(_chainId, _functionType, _lzTxParams);
        return layerZeroEndpoint.estimateFees(_chainId, address(this), payload, useLayerZeroToken, lzTxParamBuilt);
    }
    //---------------------------------------------------------------------------
    // dao functions
    function setBridge(uint16 _chainId, bytes calldata _bridgeAddress) external onlyOwner {
        require(bridgeLookup[_chainId].length == 0, "Stargate: Bridge already set!");
        bridgeLookup[_chainId] = _bridgeAddress;
    }
    function setGasAmount(
        uint16 _chainId,
        uint8 _functionType,
        uint256 _gasAmount
    ) external onlyOwner {
        require(_functionType >= 1 && _functionType <= 4, "Stargate: invalid _functionType");
        gasLookup[_chainId][_functionType] = _gasAmount;
    }
    function approveTokenSpender(
        address token,
        address spender,
        uint256 amount
    ) external onlyOwner {
        IERC20(token).approve(spender, amount);
    }
    function setUseLayerZeroToken(bool enable) external onlyOwner {
        useLayerZeroToken = enable;
    }
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external override onlyOwner {
        layerZeroEndpoint.forceResumeReceive(_srcChainId, _srcAddress);
    }
    //---------------------------------------------------------------------------
    // generic config for user Application
    function setConfig(
        uint16 _version,
        uint16 _chainId,
        uint256 _configType,
        bytes calldata _config
    ) external override onlyOwner {
        layerZeroEndpoint.setConfig(_version, _chainId, _configType, _config);
    }
    function setSendVersion(uint16 version) external override onlyOwner {
        layerZeroEndpoint.setSendVersion(version);
    }
    function setReceiveVersion(uint16 version) external override onlyOwner {
        layerZeroEndpoint.setReceiveVersion(version);
    }
    //---------------------------------------------------------------------------
    // INTERNAL functions
    function txParamBuilderType1(uint256 _gasAmount) internal pure returns (bytes memory) {
        uint16 txType = 1;
        return abi.encodePacked(txType, _gasAmount);
    }
    function txParamBuilderType2(
        uint256 _gasAmount,
        uint256 _dstNativeAmount,
        bytes memory _dstNativeAddr
    ) internal pure returns (bytes memory) {
        uint16 txType = 2;
        return abi.encodePacked(txType, _gasAmount, _dstNativeAmount, _dstNativeAddr);
    }
    function _txParamBuilder(
        uint16 _chainId,
        uint8 _type,
        IStargateRouter.lzTxObj memory _lzTxParams
    ) internal view returns (bytes memory) {
        bytes memory lzTxParam;
        address dstNativeAddr;
        {
            bytes memory dstNativeAddrBytes = _lzTxParams.dstNativeAddr;
            assembly {
                dstNativeAddr := mload(add(dstNativeAddrBytes, 20))
            }
        }
        uint256 totalGas = gasLookup[_chainId][_type].add(_lzTxParams.dstGasForCall);
        if (_lzTxParams.dstNativeAmount > 0 && dstNativeAddr != address(0x0)) {
            lzTxParam = txParamBuilderType2(totalGas, _lzTxParams.dstNativeAmount, _lzTxParams.dstNativeAddr);
        } else {
            lzTxParam = txParamBuilderType1(totalGas);
        }
        return lzTxParam;
    }
    function _call(
        uint16 _chainId,
        uint8 _type,
        address payable _refundAddress,
        IStargateRouter.lzTxObj memory _lzTxParams,
        bytes memory _payload
    ) internal {
        bytes memory lzTxParamBuilt = _txParamBuilder(_chainId, _type, _lzTxParams);
        uint64 nextNonce = layerZeroEndpoint.getOutboundNonce(_chainId, address(this)) + 1;
        layerZeroEndpoint.send{value: msg.value}(_chainId, bridgeLookup[_chainId], _payload, _refundAddress, address(this), lzTxParamBuilt);
        emit SendMsg(_type, nextNonce);
    }
    function renounceOwnership() public override onlyOwner {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
interface IStargateRouter {
    struct lzTxObj {
        uint256 dstGasForCall;
        uint256 dstNativeAmount;
        bytes dstNativeAddr;
    }
    function addLiquidity(
        uint256 _poolId,
        uint256 _amountLD,
        address _to
    ) external;
    function swap(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLD,
        uint256 _minAmountLD,
        lzTxObj memory _lzTxParams,
        bytes calldata _to,
        bytes calldata _payload
    ) external payable;
    function redeemRemote(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        uint256 _minAmountLD,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable;
    function instantRedeemLocal(
        uint16 _srcPoolId,
        uint256 _amountLP,
        address _to
    ) external returns (uint256);
    function redeemLocal(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable;
    function sendCredits(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress
    ) external payable;
    function quoteLayerZeroFee(
        uint16 _dstChainId,
        uint8 _functionType,
        bytes calldata _toAddress,
        bytes calldata _transferAndCallPayload,
        lzTxObj memory _lzTxParams
    ) external view returns (uint256, uint256);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
interface IStargateReceiver {
    function sgReceive(
        uint16 _chainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        address _token,
        uint256 amountLD,
        bytes memory payload
    ) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
contract LPTokenERC20 {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    string public name;
    string public symbol;
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    // set in constructor
    bytes32 public DOMAIN_SEPARATOR;
    //---------------------------------------------------------------------------
    // VARIABLES
    uint256 public decimals;
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    mapping(address => uint256) public nonces;
    //---------------------------------------------------------------------------
    // EVENTS
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);
    constructor(string memory _name, string memory _symbol) {
        name = _name;
        symbol = _symbol;
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name)),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
    }
    function _mint(address to, uint256 value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }
    function _burn(address from, uint256 value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }
    function _approve(
        address owner,
        address spender,
        uint256 value
    ) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }
    function _transfer(
        address from,
        address to,
        uint256 value
    ) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }
    function approve(address spender, uint256 value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }
    function transfer(address to, uint256 value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool) {
        if (allowance[from][msg.sender] != uint256(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender].add(addedValue));
        return true;
    }
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(deadline >= block.timestamp, "Bridge: EXPIRED");
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\\x19\\x01",
                DOMAIN_SEPARATOR,
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress != address(0) && recoveredAddress == owner, "Bridge: INVALID_SIGNATURE");
        _approve(owner, spender, value);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.7.6;
pragma abicoder v2;
import "../Pool.sol";
interface IStargateFeeLibrary {
    function getFees(
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint16 _dstChainId,
        address _from,
        uint256 _amountSD
    ) external returns (Pool.SwapObj memory s);
    function getVersion() external view returns (string memory);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroReceiver {
    // @notice LayerZero endpoint will invoke this function to deliver the message on the destination
    // @param _srcChainId - the source endpoint identifier
    // @param _srcAddress - the source sending contract address from the source chain
    // @param _nonce - the ordered message nonce
    // @param _payload - the signed payload is the UA bytes has encoded to be sent
    function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) external;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
import "./ILayerZeroUserApplicationConfig.sol";
interface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {
    // @notice send a LayerZero message to the specified address at a LayerZero endpoint.
    // @param _dstChainId - the destination chain identifier
    // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains
    // @param _payload - a custom bytes payload to send to the destination contract
    // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address
    // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction
    // @param _adapterParams - parameters for custom functionality. ie: pay for a specified destination gasAmount, or receive airdropped native gas from the relayer on destination
    function send(uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;
    // @notice used by the messaging library to publish verified payload
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source contract (as bytes) at the source chain
    // @param _dstAddress - the address on destination chain
    // @param _nonce - the unbound message ordering nonce
    // @param _gasLimit - the gas limit for external contract execution
    // @param _payload - verified payload to send to the destination contract
    function receivePayload(uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload) external;
    // @notice get the inboundNonce of a receiver from a source chain which could be EVM or non-EVM chain
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64);
    // @notice get the outboundNonce from this source chain which, consequently, is always an EVM
    // @param _srcAddress - the source chain contract address
    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64);
    // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery
    // @param _dstChainId - the destination chain identifier
    // @param _userApplication - the user app address on this EVM chain
    // @param _payload - the custom message to send over LayerZero
    // @param _payInZRO - if false, user app pays the protocol fee in native token
    // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain
    function estimateFees(uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);
    // @notice get this Endpoint's immutable source identifier
    function getChainId() external view returns (uint16);
    // @notice the interface to retry failed message on this Endpoint destination
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    // @param _payload - the payload to be retried
    function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external;
    // @notice query if any STORED payload (message blocking) at the endpoint.
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool);
    // @notice query if the _libraryAddress is valid for sending msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getSendLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the _libraryAddress is valid for receiving msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getReceiveLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the non-reentrancy guard for send() is on
    // @return true if the guard is on. false otherwise
    function isSendingPayload() external view returns (bool);
    // @notice query if the non-reentrancy guard for receive() is on
    // @return true if the guard is on. false otherwise
    function isReceivingPayload() external view returns (bool);
    // @notice get the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _userApplication - the contract address of the user application
    // @param _configType - type of configuration. every messaging library has its own convention.
    function getConfig(uint16 _version, uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);
    // @notice get the send() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getSendVersion(address _userApplication) external view returns (uint16);
    // @notice get the lzReceive() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getReceiveVersion(address _userApplication) external view returns (uint16);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroUserApplicationConfig {
    // @notice set the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _configType - type of configuration. every messaging library has its own convention.
    // @param _config - configuration in the bytes. can encode arbitrary content.
    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external;
    // @notice set the send() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setSendVersion(uint16 _version) external;
    // @notice set the lzReceive() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setReceiveVersion(uint16 _version) external;
    // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload
    // @param _srcChainId - the chainId of the source chain
    // @param _srcAddress - the contract address of the source contract at the source chain
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./Pool.sol";
contract Factory is Ownable {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // VARIABLES
    mapping(uint256 => Pool) public getPool; // poolId -> PoolInfo
    address[] public allPools;
    address public immutable router;
    address public defaultFeeLibrary; // address for retrieving fee params for swaps
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == router, "Stargate: caller must be Router.");
        _;
    }
    constructor(address _router) {
        require(_router != address(0x0), "Stargate: _router cant be 0x0"); // 1 time only
        router = _router;
    }
    function setDefaultFeeLibrary(address _defaultFeeLibrary) external onlyOwner {
        require(_defaultFeeLibrary != address(0x0), "Stargate: fee library cant be 0x0");
        defaultFeeLibrary = _defaultFeeLibrary;
    }
    function allPoolsLength() external view returns (uint256) {
        return allPools.length;
    }
    function createPool(
        uint256 _poolId,
        address _token,
        uint8 _sharedDecimals,
        uint8 _localDecimals,
        string memory _name,
        string memory _symbol
    ) public onlyRouter returns (address poolAddress) {
        require(address(getPool[_poolId]) == address(0x0), "Stargate: Pool already created");
        Pool pool = new Pool(_poolId, router, _token, _sharedDecimals, _localDecimals, defaultFeeLibrary, _name, _symbol);
        getPool[_poolId] = pool;
        poolAddress = address(pool);
        allPools.push(poolAddress);
    }
    function renounceOwnership() public override onlyOwner {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
// imports
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./LPTokenERC20.sol";
import "./interfaces/IStargateFeeLibrary.sol";
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
/// Pool contracts on other chains and managed by the Stargate protocol.
contract Pool is LPTokenERC20, ReentrancyGuard {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)")));
    uint256 public constant BP_DENOMINATOR = 10000;
    //---------------------------------------------------------------------------
    // STRUCTS
    struct ChainPath {
        bool ready; // indicate if the counter chainPath has been created.
        uint16 dstChainId;
        uint256 dstPoolId;
        uint256 weight;
        uint256 balance;
        uint256 lkb;
        uint256 credits;
        uint256 idealBalance;
    }
    struct SwapObj {
        uint256 amount;
        uint256 eqFee;
        uint256 eqReward;
        uint256 lpFee;
        uint256 protocolFee;
        uint256 lkbRemove;
    }
    struct CreditObj {
        uint256 credits;
        uint256 idealBalance;
    }
    //---------------------------------------------------------------------------
    // VARIABLES
    // chainPath
    ChainPath[] public chainPaths; // list of connected chains with shared pools
    mapping(uint16 => mapping(uint256 => uint256)) public chainPathIndexLookup; // lookup for chainPath by chainId => poolId =>index
    // metadata
    uint256 public immutable poolId; // shared id between chains to represent same pool
    uint256 public sharedDecimals; // the shared decimals (lowest common decimals between chains)
    uint256 public localDecimals; // the decimals for the token
    uint256 public immutable convertRate; // the decimals for the token
    address public immutable token; // the token for the pool
    address public immutable router; // the token for the pool
    bool public stopSwap; // flag to stop swapping in extreme cases
    // Fee and Liquidity
    uint256 public totalLiquidity; // the total amount of tokens added on this side of the chain (fees + deposits - withdrawals)
    uint256 public totalWeight; // total weight for pool percentages
    uint256 public mintFeeBP; // fee basis points for the mint/deposit
    uint256 public protocolFeeBalance; // fee balance created from dao fee
    uint256 public mintFeeBalance; // fee balance created from mint fee
    uint256 public eqFeePool; // pool rewards in Shared Decimal format. indicate the total budget for reverse swap incentive
    address public feeLibrary; // address for retrieving fee params for swaps
    // Delta related
    uint256 public deltaCredit; // credits accumulated from txn
    bool public batched; // flag to indicate if we want batch processing.
    bool public defaultSwapMode; // flag for the default mode for swap
    bool public defaultLPMode; // flag for the default mode for lp
    uint256 public swapDeltaBP; // basis points of poolCredits to activate Delta in swap
    uint256 public lpDeltaBP; // basis points of poolCredits to activate Delta in liquidity events
    //---------------------------------------------------------------------------
    // EVENTS
    event Mint(address to, uint256 amountLP, uint256 amountSD, uint256 mintFeeAmountSD);
    event Burn(address from, uint256 amountLP, uint256 amountSD);
    event RedeemLocalCallback(address _to, uint256 _amountSD, uint256 _amountToMintSD);
    event Swap(
        uint16 chainId,
        uint256 dstPoolId,
        address from,
        uint256 amountSD,
        uint256 eqReward,
        uint256 eqFee,
        uint256 protocolFee,
        uint256 lpFee
    );
    event SendCredits(uint16 dstChainId, uint256 dstPoolId, uint256 credits, uint256 idealBalance);
    event RedeemRemote(uint16 chainId, uint256 dstPoolId, address from, uint256 amountLP, uint256 amountSD);
    event RedeemLocal(address from, uint256 amountLP, uint256 amountSD, uint16 chainId, uint256 dstPoolId, bytes to);
    event InstantRedeemLocal(address from, uint256 amountLP, uint256 amountSD, address to);
    event CreditChainPath(uint16 chainId, uint256 srcPoolId, uint256 amountSD, uint256 idealBalance);
    event SwapRemote(address to, uint256 amountSD, uint256 protocolFee, uint256 dstFee);
    event WithdrawRemote(uint16 srcChainId, uint256 srcPoolId, uint256 swapAmount, uint256 mintAmount);
    event ChainPathUpdate(uint16 dstChainId, uint256 dstPoolId, uint256 weight);
    event FeesUpdated(uint256 mintFeeBP);
    event FeeLibraryUpdated(address feeLibraryAddr);
    event StopSwapUpdated(bool swapStop);
    event WithdrawProtocolFeeBalance(address to, uint256 amountSD);
    event WithdrawMintFeeBalance(address to, uint256 amountSD);
    event DeltaParamUpdated(bool batched, uint256 swapDeltaBP, uint256 lpDeltaBP, bool defaultSwapMode, bool defaultLPMode);
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == router, "Stargate: only the router can call this method");
        _;
    }
    constructor(
        uint256 _poolId,
        address _router,
        address _token,
        uint256 _sharedDecimals,
        uint256 _localDecimals,
        address _feeLibrary,
        string memory _name,
        string memory _symbol
    ) LPTokenERC20(_name, _symbol) {
        require(_token != address(0x0), "Stargate: _token cannot be 0x0");
        require(_router != address(0x0), "Stargate: _router cannot be 0x0");
        poolId = _poolId;
        router = _router;
        token = _token;
        sharedDecimals = _sharedDecimals;
        decimals = uint8(_sharedDecimals);
        localDecimals = _localDecimals;
        convertRate = 10**(uint256(localDecimals).sub(sharedDecimals));
        totalWeight = 0;
        feeLibrary = _feeLibrary;
        //delta algo related
        batched = false;
        defaultSwapMode = true;
        defaultLPMode = true;
    }
    function getChainPathsLength() public view returns (uint256) {
        return chainPaths.length;
    }
    //---------------------------------------------------------------------------
    // LOCAL CHAIN FUNCTIONS
    function mint(address _to, uint256 _amountLD) external nonReentrant onlyRouter returns (uint256) {
        return _mintLocal(_to, _amountLD, true, true);
    }
    // Local                                    Remote
    // -------                                  ---------
    // swap             ->                      swapRemote
    function swap(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        address _from,
        uint256 _amountLD,
        uint256 _minAmountLD,
        bool newLiquidity
    ) external nonReentrant onlyRouter returns (SwapObj memory) {
        require(!stopSwap, "Stargate: swap func stopped");
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == true, "Stargate: counter chainPath is not ready");
        uint256 amountSD = amountLDtoSD(_amountLD);
        uint256 minAmountSD = amountLDtoSD(_minAmountLD);
        // request fee params from library
        SwapObj memory s = IStargateFeeLibrary(feeLibrary).getFees(poolId, _dstPoolId, _dstChainId, _from, amountSD);
        // equilibrium fee and reward. note eqFee/eqReward are separated from swap liquidity
        eqFeePool = eqFeePool.sub(s.eqReward);
        // update the new amount the user gets minus the fees
        s.amount = amountSD.sub(s.eqFee).sub(s.protocolFee).sub(s.lpFee);
        // users will also get the eqReward
        require(s.amount.add(s.eqReward) >= minAmountSD, "Stargate: slippage too high");
        // behaviours
        //     - protocolFee: booked, stayed and withdrawn at remote.
        //     - eqFee: booked, stayed and withdrawn at remote.
        //     - lpFee: booked and stayed at remote, can be withdrawn anywhere
        s.lkbRemove = amountSD.sub(s.lpFee).add(s.eqReward);
        // check for transfer solvency.
        require(cp.balance >= s.lkbRemove, "Stargate: dst balance too low");
        cp.balance = cp.balance.sub(s.lkbRemove);
        if (newLiquidity) {
            deltaCredit = deltaCredit.add(amountSD).add(s.eqReward);
        } else if (s.eqReward > 0) {
            deltaCredit = deltaCredit.add(s.eqReward);
        }
        // distribute credits on condition.
        if (!batched || deltaCredit >= totalLiquidity.mul(swapDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultSwapMode);
        }
        emit Swap(_dstChainId, _dstPoolId, _from, s.amount, s.eqReward, s.eqFee, s.protocolFee, s.lpFee);
        return s;
    }
    // Local                                    Remote
    // -------                                  ---------
    // sendCredits      ->                      creditChainPath
    function sendCredits(uint16 _dstChainId, uint256 _dstPoolId) external nonReentrant onlyRouter returns (CreditObj memory c) {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == true, "Stargate: counter chainPath is not ready");
        cp.lkb = cp.lkb.add(cp.credits);
        c.idealBalance = totalLiquidity.mul(cp.weight).div(totalWeight);
        c.credits = cp.credits;
        cp.credits = 0;
        emit SendCredits(_dstChainId, _dstPoolId, c.credits, c.idealBalance);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemRemote   ->                        swapRemote
    function redeemRemote(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        address _from,
        uint256 _amountLP
    ) external nonReentrant onlyRouter {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        uint256 amountSD = _burnLocal(_from, _amountLP);
        //run Delta
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultLPMode);
        }
        uint256 amountLD = amountSDtoLD(amountSD);
        emit RedeemRemote(_dstChainId, _dstPoolId, _from, _amountLP, amountLD);
    }
    function instantRedeemLocal(
        address _from,
        uint256 _amountLP,
        address _to
    ) external nonReentrant onlyRouter returns (uint256 amountSD) {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        uint256 _deltaCredit = deltaCredit; // sload optimization.
        uint256 _capAmountLP = _amountSDtoLP(_deltaCredit);
        if (_amountLP > _capAmountLP) _amountLP = _capAmountLP;
        amountSD = _burnLocal(_from, _amountLP);
        deltaCredit = _deltaCredit.sub(amountSD);
        uint256 amountLD = amountSDtoLD(amountSD);
        _safeTransfer(token, _to, amountLD);
        emit InstantRedeemLocal(_from, _amountLP, amountSD, _to);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal   ->                         redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocal(
        address _from,
        uint256 _amountLP,
        uint16 _dstChainId,
        uint256 _dstPoolId,
        bytes calldata _to
    ) external nonReentrant onlyRouter returns (uint256 amountSD) {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        // safeguard.
        require(chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]].ready == true, "Stargate: counter chainPath is not ready");
        amountSD = _burnLocal(_from, _amountLP);
        // run Delta
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(false);
        }
        emit RedeemLocal(_from, _amountLP, amountSD, _dstChainId, _dstPoolId, _to);
    }
    //---------------------------------------------------------------------------
    // REMOTE CHAIN FUNCTIONS
    // Local                                    Remote
    // -------                                  ---------
    // sendCredits      ->                      creditChainPath
    function creditChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        CreditObj memory _c
    ) external nonReentrant onlyRouter {
        ChainPath storage cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        cp.balance = cp.balance.add(_c.credits);
        if (cp.idealBalance != _c.idealBalance) {
            cp.idealBalance = _c.idealBalance;
        }
        emit CreditChainPath(_dstChainId, _dstPoolId, _c.credits, _c.idealBalance);
    }
    // Local                                    Remote
    // -------                                  ---------
    // swap             ->                      swapRemote
    function swapRemote(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        address _to,
        SwapObj memory _s
    ) external nonReentrant onlyRouter returns (uint256 amountLD) {
        // booking lpFee
        totalLiquidity = totalLiquidity.add(_s.lpFee);
        // booking eqFee
        eqFeePool = eqFeePool.add(_s.eqFee);
        // booking stargateFee
        protocolFeeBalance = protocolFeeBalance.add(_s.protocolFee);
        // update LKB
        uint256 chainPathIndex = chainPathIndexLookup[_srcChainId][_srcPoolId];
        chainPaths[chainPathIndex].lkb = chainPaths[chainPathIndex].lkb.sub(_s.lkbRemove);
        // user receives the amount + the srcReward
        amountLD = amountSDtoLD(_s.amount.add(_s.eqReward));
        _safeTransfer(token, _to, amountLD);
        emit SwapRemote(_to, _s.amount.add(_s.eqReward), _s.protocolFee, _s.eqFee);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal   ->                         redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocalCallback(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        address _to,
        uint256 _amountSD,
        uint256 _amountToMintSD
    ) external nonReentrant onlyRouter {
        if (_amountToMintSD > 0) {
            _mintLocal(_to, amountSDtoLD(_amountToMintSD), false, false);
        }
        ChainPath storage cp = getAndCheckCP(_srcChainId, _srcPoolId);
        cp.lkb = cp.lkb.sub(_amountSD);
        uint256 amountLD = amountSDtoLD(_amountSD);
        _safeTransfer(token, _to, amountLD);
        emit RedeemLocalCallback(_to, _amountSD, _amountToMintSD);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal(amount)   ->               redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocalCheckOnRemote(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        uint256 _amountSD
    ) external nonReentrant onlyRouter returns (uint256 swapAmount, uint256 mintAmount) {
        ChainPath storage cp = getAndCheckCP(_srcChainId, _srcPoolId);
        if (_amountSD > cp.balance) {
            mintAmount = _amountSD - cp.balance;
            swapAmount = cp.balance;
            cp.balance = 0;
        } else {
            cp.balance = cp.balance.sub(_amountSD);
            swapAmount = _amountSD;
            mintAmount = 0;
        }
        emit WithdrawRemote(_srcChainId, _srcPoolId, swapAmount, mintAmount);
    }
    //---------------------------------------------------------------------------
    // DAO Calls
    function createChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint256 _weight
    ) external onlyRouter {
        for (uint256 i = 0; i < chainPaths.length; ++i) {
            ChainPath memory cp = chainPaths[i];
            bool exists = cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId;
            require(!exists, "Stargate: cant createChainPath of existing dstChainId and _dstPoolId");
        }
        totalWeight = totalWeight.add(_weight);
        chainPathIndexLookup[_dstChainId][_dstPoolId] = chainPaths.length;
        chainPaths.push(ChainPath(false, _dstChainId, _dstPoolId, _weight, 0, 0, 0, 0));
        emit ChainPathUpdate(_dstChainId, _dstPoolId, _weight);
    }
    function setWeightForChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint16 _weight
    ) external onlyRouter {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        totalWeight = totalWeight.sub(cp.weight).add(_weight);
        cp.weight = _weight;
        emit ChainPathUpdate(_dstChainId, _dstPoolId, _weight);
    }
    function setFee(uint256 _mintFeeBP) external onlyRouter {
        require(_mintFeeBP <= BP_DENOMINATOR, "Bridge: cum fees > 100%");
        mintFeeBP = _mintFeeBP;
        emit FeesUpdated(mintFeeBP);
    }
    function setFeeLibrary(address _feeLibraryAddr) external onlyRouter {
        require(_feeLibraryAddr != address(0x0), "Stargate: fee library cant be 0x0");
        feeLibrary = _feeLibraryAddr;
        emit FeeLibraryUpdated(_feeLibraryAddr);
    }
    function setSwapStop(bool _swapStop) external onlyRouter {
        stopSwap = _swapStop;
        emit StopSwapUpdated(_swapStop);
    }
    function setDeltaParam(
        bool _batched,
        uint256 _swapDeltaBP,
        uint256 _lpDeltaBP,
        bool _defaultSwapMode,
        bool _defaultLPMode
    ) external onlyRouter {
        require(_swapDeltaBP <= BP_DENOMINATOR && _lpDeltaBP <= BP_DENOMINATOR, "Stargate: wrong Delta param");
        batched = _batched;
        swapDeltaBP = _swapDeltaBP;
        lpDeltaBP = _lpDeltaBP;
        defaultSwapMode = _defaultSwapMode;
        defaultLPMode = _defaultLPMode;
        emit DeltaParamUpdated(_batched, _swapDeltaBP, _lpDeltaBP, _defaultSwapMode, _defaultLPMode);
    }
    function callDelta(bool _fullMode) external onlyRouter {
        _delta(_fullMode);
    }
    function activateChainPath(uint16 _dstChainId, uint256 _dstPoolId) external onlyRouter {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == false, "Stargate: chainPath is already active");
        // this func will only be called once
        cp.ready = true;
    }
    function withdrawProtocolFeeBalance(address _to) external onlyRouter {
        if (protocolFeeBalance > 0) {
            uint256 amountOfLD = amountSDtoLD(protocolFeeBalance);
            protocolFeeBalance = 0;
            _safeTransfer(token, _to, amountOfLD);
            emit WithdrawProtocolFeeBalance(_to, amountOfLD);
        }
    }
    function withdrawMintFeeBalance(address _to) external onlyRouter {
        if (mintFeeBalance > 0) {
            uint256 amountOfLD = amountSDtoLD(mintFeeBalance);
            mintFeeBalance = 0;
            _safeTransfer(token, _to, amountOfLD);
            emit WithdrawMintFeeBalance(_to, amountOfLD);
        }
    }
    //---------------------------------------------------------------------------
    // INTERNAL
    // Conversion Helpers
    //---------------------------------------------------------------------------
    function amountLPtoLD(uint256 _amountLP) external view returns (uint256) {
        return amountSDtoLD(_amountLPtoSD(_amountLP));
    }
    function _amountLPtoSD(uint256 _amountLP) internal view returns (uint256) {
        require(totalSupply > 0, "Stargate: cant convert LPtoSD when totalSupply == 0");
        return _amountLP.mul(totalLiquidity).div(totalSupply);
    }
    function _amountSDtoLP(uint256 _amountSD) internal view returns (uint256) {
        require(totalLiquidity > 0, "Stargate: cant convert SDtoLP when totalLiq == 0");
        return _amountSD.mul(totalSupply).div(totalLiquidity);
    }
    function amountSDtoLD(uint256 _amount) internal view returns (uint256) {
        return _amount.mul(convertRate);
    }
    function amountLDtoSD(uint256 _amount) internal view returns (uint256) {
        return _amount.div(convertRate);
    }
    function getAndCheckCP(uint16 _dstChainId, uint256 _dstPoolId) internal view returns (ChainPath storage) {
        require(chainPaths.length > 0, "Stargate: no chainpaths exist");
        ChainPath storage cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        require(cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId, "Stargate: local chainPath does not exist");
        return cp;
    }
    function getChainPath(uint16 _dstChainId, uint256 _dstPoolId) external view returns (ChainPath memory) {
        ChainPath memory cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        require(cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId, "Stargate: local chainPath does not exist");
        return cp;
    }
    function _burnLocal(address _from, uint256 _amountLP) internal returns (uint256) {
        require(totalSupply > 0, "Stargate: cant burn when totalSupply == 0");
        uint256 amountOfLPTokens = balanceOf[_from];
        require(amountOfLPTokens >= _amountLP, "Stargate: not enough LP tokens to burn");
        uint256 amountSD = _amountLP.mul(totalLiquidity).div(totalSupply);
        //subtract totalLiquidity accordingly
        totalLiquidity = totalLiquidity.sub(amountSD);
        _burn(_from, _amountLP);
        emit Burn(_from, _amountLP, amountSD);
        return amountSD;
    }
    function _delta(bool fullMode) internal {
        if (deltaCredit > 0 && totalWeight > 0) {
            uint256 cpLength = chainPaths.length;
            uint256[] memory deficit = new uint256[](cpLength);
            uint256 totalDeficit = 0;
            // algorithm steps 6-9: calculate the total and the amounts required to get to balance state
            for (uint256 i = 0; i < cpLength; ++i) {
                ChainPath storage cp = chainPaths[i];
                // (liquidity * (weight/totalWeight)) - (lkb+credits)
                uint256 balLiq = totalLiquidity.mul(cp.weight).div(totalWeight);
                uint256 currLiq = cp.lkb.add(cp.credits);
                if (balLiq > currLiq) {
                    // save gas since we know balLiq > currLiq and we know deficit[i] > 0
                    deficit[i] = balLiq - currLiq;
                    totalDeficit = totalDeficit.add(deficit[i]);
                }
            }
            // indicates how much delta credit is distributed
            uint256 spent;
            // handle credits with 2 tranches. the [ < totalDeficit] [excessCredit]
            // run full Delta, allocate all credits
            if (totalDeficit == 0) {
                // only fullMode delta will allocate excess credits
                if (fullMode && deltaCredit > 0) {
                    // credit ChainPath by weights
                    for (uint256 i = 0; i < cpLength; ++i) {
                        ChainPath storage cp = chainPaths[i];
                        // credits = credits + toBalanceChange + remaining allocation based on weight
                        uint256 amtToCredit = deltaCredit.mul(cp.weight).div(totalWeight);
                        spent = spent.add(amtToCredit);
                        cp.credits = cp.credits.add(amtToCredit);
                    }
                } // else do nth
            } else if (totalDeficit <= deltaCredit) {
                if (fullMode) {
                    // algorithm step 13: calculate amount to disperse to bring to balance state or as close as possible
                    uint256 excessCredit = deltaCredit - totalDeficit;
                    // algorithm steps 14-16: calculate credits
                    for (uint256 i = 0; i < cpLength; ++i) {
                        if (deficit[i] > 0) {
                            ChainPath storage cp = chainPaths[i];
                            // credits = credits + deficit + remaining allocation based on weight
                            uint256 amtToCredit = deficit[i].add(excessCredit.mul(cp.weight).div(totalWeight));
                            spent = spent.add(amtToCredit);
                            cp.credits = cp.credits.add(amtToCredit);
                        }
                    }
                } else {
                    // totalDeficit <= deltaCredit but not running fullMode
                    // credit chainPaths as is if any deficit, not using all deltaCredit
                    for (uint256 i = 0; i < cpLength; ++i) {
                        if (deficit[i] > 0) {
                            ChainPath storage cp = chainPaths[i];
                            uint256 amtToCredit = deficit[i];
                            spent = spent.add(amtToCredit);
                            cp.credits = cp.credits.add(amtToCredit);
                        }
                    }
                }
            } else {
                // totalDeficit > deltaCredit, fullMode or not, normalize the deficit by deltaCredit
                for (uint256 i = 0; i < cpLength; ++i) {
                    if (deficit[i] > 0) {
                        ChainPath storage cp = chainPaths[i];
                        uint256 proportionalDeficit = deficit[i].mul(deltaCredit).div(totalDeficit);
                        spent = spent.add(proportionalDeficit);
                        cp.credits = cp.credits.add(proportionalDeficit);
                    }
                }
            }
            // deduct the amount of credit sent
            deltaCredit = deltaCredit.sub(spent);
        }
    }
    function _mintLocal(
        address _to,
        uint256 _amountLD,
        bool _feesEnabled,
        bool _creditDelta
    ) internal returns (uint256 amountSD) {
        require(totalWeight > 0, "Stargate: No ChainPaths exist");
        amountSD = amountLDtoSD(_amountLD);
        uint256 mintFeeSD = 0;
        if (_feesEnabled) {
            mintFeeSD = amountSD.mul(mintFeeBP).div(BP_DENOMINATOR);
            amountSD = amountSD.sub(mintFeeSD);
            mintFeeBalance = mintFeeBalance.add(mintFeeSD);
        }
        if (_creditDelta) {
            deltaCredit = deltaCredit.add(amountSD);
        }
        uint256 amountLPTokens = amountSD;
        if (totalSupply != 0) {
            amountLPTokens = amountSD.mul(totalSupply).div(totalLiquidity);
        }
        totalLiquidity = totalLiquidity.add(amountSD);
        _mint(_to, amountLPTokens);
        emit Mint(_to, amountLPTokens, amountSD, mintFeeSD);
        // add to credits and call delta. short circuit to save gas
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultLPMode);
        }
    }
    function _safeTransfer(
        address _token,
        address _to,
        uint256 _value
    ) private {
        (bool success, bytes memory data) = _token.call(abi.encodeWithSelector(SELECTOR, _to, _value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "Stargate: TRANSFER_FAILED");
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    constructor () {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
contract LPTokenERC20 {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    string public name;
    string public symbol;
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    // set in constructor
    bytes32 public DOMAIN_SEPARATOR;
    //---------------------------------------------------------------------------
    // VARIABLES
    uint256 public decimals;
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    mapping(address => uint256) public nonces;
    //---------------------------------------------------------------------------
    // EVENTS
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);
    constructor(string memory _name, string memory _symbol) {
        name = _name;
        symbol = _symbol;
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name)),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
    }
    function _mint(address to, uint256 value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }
    function _burn(address from, uint256 value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }
    function _approve(
        address owner,
        address spender,
        uint256 value
    ) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }
    function _transfer(
        address from,
        address to,
        uint256 value
    ) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }
    function approve(address spender, uint256 value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }
    function transfer(address to, uint256 value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool) {
        if (allowance[from][msg.sender] != uint256(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender].add(addedValue));
        return true;
    }
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(deadline >= block.timestamp, "Bridge: EXPIRED");
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\\x19\\x01",
                DOMAIN_SEPARATOR,
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress != address(0) && recoveredAddress == owner, "Bridge: INVALID_SIGNATURE");
        _approve(owner, spender, value);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.7.6;
pragma abicoder v2;
import "../Pool.sol";
interface IStargateFeeLibrary {
    function getFees(
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint16 _dstChainId,
        address _from,
        uint256 _amountSD
    ) external returns (Pool.SwapObj memory s);
    function getVersion() external view returns (string memory);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
// imports
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./LPTokenERC20.sol";
import "./interfaces/IStargateFeeLibrary.sol";
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
/// Pool contracts on other chains and managed by the Stargate protocol.
contract Pool is LPTokenERC20, ReentrancyGuard {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)")));
    uint256 public constant BP_DENOMINATOR = 10000;
    //---------------------------------------------------------------------------
    // STRUCTS
    struct ChainPath {
        bool ready; // indicate if the counter chainPath has been created.
        uint16 dstChainId;
        uint256 dstPoolId;
        uint256 weight;
        uint256 balance;
        uint256 lkb;
        uint256 credits;
        uint256 idealBalance;
    }
    struct SwapObj {
        uint256 amount;
        uint256 eqFee;
        uint256 eqReward;
        uint256 lpFee;
        uint256 protocolFee;
        uint256 lkbRemove;
    }
    struct CreditObj {
        uint256 credits;
        uint256 idealBalance;
    }
    //---------------------------------------------------------------------------
    // VARIABLES
    // chainPath
    ChainPath[] public chainPaths; // list of connected chains with shared pools
    mapping(uint16 => mapping(uint256 => uint256)) public chainPathIndexLookup; // lookup for chainPath by chainId => poolId =>index
    // metadata
    uint256 public immutable poolId; // shared id between chains to represent same pool
    uint256 public sharedDecimals; // the shared decimals (lowest common decimals between chains)
    uint256 public localDecimals; // the decimals for the token
    uint256 public immutable convertRate; // the decimals for the token
    address public immutable token; // the token for the pool
    address public immutable router; // the token for the pool
    bool public stopSwap; // flag to stop swapping in extreme cases
    // Fee and Liquidity
    uint256 public totalLiquidity; // the total amount of tokens added on this side of the chain (fees + deposits - withdrawals)
    uint256 public totalWeight; // total weight for pool percentages
    uint256 public mintFeeBP; // fee basis points for the mint/deposit
    uint256 public protocolFeeBalance; // fee balance created from dao fee
    uint256 public mintFeeBalance; // fee balance created from mint fee
    uint256 public eqFeePool; // pool rewards in Shared Decimal format. indicate the total budget for reverse swap incentive
    address public feeLibrary; // address for retrieving fee params for swaps
    // Delta related
    uint256 public deltaCredit; // credits accumulated from txn
    bool public batched; // flag to indicate if we want batch processing.
    bool public defaultSwapMode; // flag for the default mode for swap
    bool public defaultLPMode; // flag for the default mode for lp
    uint256 public swapDeltaBP; // basis points of poolCredits to activate Delta in swap
    uint256 public lpDeltaBP; // basis points of poolCredits to activate Delta in liquidity events
    //---------------------------------------------------------------------------
    // EVENTS
    event Mint(address to, uint256 amountLP, uint256 amountSD, uint256 mintFeeAmountSD);
    event Burn(address from, uint256 amountLP, uint256 amountSD);
    event RedeemLocalCallback(address _to, uint256 _amountSD, uint256 _amountToMintSD);
    event Swap(
        uint16 chainId,
        uint256 dstPoolId,
        address from,
        uint256 amountSD,
        uint256 eqReward,
        uint256 eqFee,
        uint256 protocolFee,
        uint256 lpFee
    );
    event SendCredits(uint16 dstChainId, uint256 dstPoolId, uint256 credits, uint256 idealBalance);
    event RedeemRemote(uint16 chainId, uint256 dstPoolId, address from, uint256 amountLP, uint256 amountSD);
    event RedeemLocal(address from, uint256 amountLP, uint256 amountSD, uint16 chainId, uint256 dstPoolId, bytes to);
    event InstantRedeemLocal(address from, uint256 amountLP, uint256 amountSD, address to);
    event CreditChainPath(uint16 chainId, uint256 srcPoolId, uint256 amountSD, uint256 idealBalance);
    event SwapRemote(address to, uint256 amountSD, uint256 protocolFee, uint256 dstFee);
    event WithdrawRemote(uint16 srcChainId, uint256 srcPoolId, uint256 swapAmount, uint256 mintAmount);
    event ChainPathUpdate(uint16 dstChainId, uint256 dstPoolId, uint256 weight);
    event FeesUpdated(uint256 mintFeeBP);
    event FeeLibraryUpdated(address feeLibraryAddr);
    event StopSwapUpdated(bool swapStop);
    event WithdrawProtocolFeeBalance(address to, uint256 amountSD);
    event WithdrawMintFeeBalance(address to, uint256 amountSD);
    event DeltaParamUpdated(bool batched, uint256 swapDeltaBP, uint256 lpDeltaBP, bool defaultSwapMode, bool defaultLPMode);
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == router, "Stargate: only the router can call this method");
        _;
    }
    constructor(
        uint256 _poolId,
        address _router,
        address _token,
        uint256 _sharedDecimals,
        uint256 _localDecimals,
        address _feeLibrary,
        string memory _name,
        string memory _symbol
    ) LPTokenERC20(_name, _symbol) {
        require(_token != address(0x0), "Stargate: _token cannot be 0x0");
        require(_router != address(0x0), "Stargate: _router cannot be 0x0");
        poolId = _poolId;
        router = _router;
        token = _token;
        sharedDecimals = _sharedDecimals;
        decimals = uint8(_sharedDecimals);
        localDecimals = _localDecimals;
        convertRate = 10**(uint256(localDecimals).sub(sharedDecimals));
        totalWeight = 0;
        feeLibrary = _feeLibrary;
        //delta algo related
        batched = false;
        defaultSwapMode = true;
        defaultLPMode = true;
    }
    function getChainPathsLength() public view returns (uint256) {
        return chainPaths.length;
    }
    //---------------------------------------------------------------------------
    // LOCAL CHAIN FUNCTIONS
    function mint(address _to, uint256 _amountLD) external nonReentrant onlyRouter returns (uint256) {
        return _mintLocal(_to, _amountLD, true, true);
    }
    // Local                                    Remote
    // -------                                  ---------
    // swap             ->                      swapRemote
    function swap(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        address _from,
        uint256 _amountLD,
        uint256 _minAmountLD,
        bool newLiquidity
    ) external nonReentrant onlyRouter returns (SwapObj memory) {
        require(!stopSwap, "Stargate: swap func stopped");
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == true, "Stargate: counter chainPath is not ready");
        uint256 amountSD = amountLDtoSD(_amountLD);
        uint256 minAmountSD = amountLDtoSD(_minAmountLD);
        // request fee params from library
        SwapObj memory s = IStargateFeeLibrary(feeLibrary).getFees(poolId, _dstPoolId, _dstChainId, _from, amountSD);
        // equilibrium fee and reward. note eqFee/eqReward are separated from swap liquidity
        eqFeePool = eqFeePool.sub(s.eqReward);
        // update the new amount the user gets minus the fees
        s.amount = amountSD.sub(s.eqFee).sub(s.protocolFee).sub(s.lpFee);
        // users will also get the eqReward
        require(s.amount.add(s.eqReward) >= minAmountSD, "Stargate: slippage too high");
        // behaviours
        //     - protocolFee: booked, stayed and withdrawn at remote.
        //     - eqFee: booked, stayed and withdrawn at remote.
        //     - lpFee: booked and stayed at remote, can be withdrawn anywhere
        s.lkbRemove = amountSD.sub(s.lpFee).add(s.eqReward);
        // check for transfer solvency.
        require(cp.balance >= s.lkbRemove, "Stargate: dst balance too low");
        cp.balance = cp.balance.sub(s.lkbRemove);
        if (newLiquidity) {
            deltaCredit = deltaCredit.add(amountSD).add(s.eqReward);
        } else if (s.eqReward > 0) {
            deltaCredit = deltaCredit.add(s.eqReward);
        }
        // distribute credits on condition.
        if (!batched || deltaCredit >= totalLiquidity.mul(swapDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultSwapMode);
        }
        emit Swap(_dstChainId, _dstPoolId, _from, s.amount, s.eqReward, s.eqFee, s.protocolFee, s.lpFee);
        return s;
    }
    // Local                                    Remote
    // -------                                  ---------
    // sendCredits      ->                      creditChainPath
    function sendCredits(uint16 _dstChainId, uint256 _dstPoolId) external nonReentrant onlyRouter returns (CreditObj memory c) {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == true, "Stargate: counter chainPath is not ready");
        cp.lkb = cp.lkb.add(cp.credits);
        c.idealBalance = totalLiquidity.mul(cp.weight).div(totalWeight);
        c.credits = cp.credits;
        cp.credits = 0;
        emit SendCredits(_dstChainId, _dstPoolId, c.credits, c.idealBalance);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemRemote   ->                        swapRemote
    function redeemRemote(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        address _from,
        uint256 _amountLP
    ) external nonReentrant onlyRouter {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        uint256 amountSD = _burnLocal(_from, _amountLP);
        //run Delta
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultLPMode);
        }
        uint256 amountLD = amountSDtoLD(amountSD);
        emit RedeemRemote(_dstChainId, _dstPoolId, _from, _amountLP, amountLD);
    }
    function instantRedeemLocal(
        address _from,
        uint256 _amountLP,
        address _to
    ) external nonReentrant onlyRouter returns (uint256 amountSD) {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        uint256 _deltaCredit = deltaCredit; // sload optimization.
        uint256 _capAmountLP = _amountSDtoLP(_deltaCredit);
        if (_amountLP > _capAmountLP) _amountLP = _capAmountLP;
        amountSD = _burnLocal(_from, _amountLP);
        deltaCredit = _deltaCredit.sub(amountSD);
        uint256 amountLD = amountSDtoLD(amountSD);
        _safeTransfer(token, _to, amountLD);
        emit InstantRedeemLocal(_from, _amountLP, amountSD, _to);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal   ->                         redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocal(
        address _from,
        uint256 _amountLP,
        uint16 _dstChainId,
        uint256 _dstPoolId,
        bytes calldata _to
    ) external nonReentrant onlyRouter returns (uint256 amountSD) {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        // safeguard.
        require(chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]].ready == true, "Stargate: counter chainPath is not ready");
        amountSD = _burnLocal(_from, _amountLP);
        // run Delta
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(false);
        }
        emit RedeemLocal(_from, _amountLP, amountSD, _dstChainId, _dstPoolId, _to);
    }
    //---------------------------------------------------------------------------
    // REMOTE CHAIN FUNCTIONS
    // Local                                    Remote
    // -------                                  ---------
    // sendCredits      ->                      creditChainPath
    function creditChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        CreditObj memory _c
    ) external nonReentrant onlyRouter {
        ChainPath storage cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        cp.balance = cp.balance.add(_c.credits);
        if (cp.idealBalance != _c.idealBalance) {
            cp.idealBalance = _c.idealBalance;
        }
        emit CreditChainPath(_dstChainId, _dstPoolId, _c.credits, _c.idealBalance);
    }
    // Local                                    Remote
    // -------                                  ---------
    // swap             ->                      swapRemote
    function swapRemote(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        address _to,
        SwapObj memory _s
    ) external nonReentrant onlyRouter returns (uint256 amountLD) {
        // booking lpFee
        totalLiquidity = totalLiquidity.add(_s.lpFee);
        // booking eqFee
        eqFeePool = eqFeePool.add(_s.eqFee);
        // booking stargateFee
        protocolFeeBalance = protocolFeeBalance.add(_s.protocolFee);
        // update LKB
        uint256 chainPathIndex = chainPathIndexLookup[_srcChainId][_srcPoolId];
        chainPaths[chainPathIndex].lkb = chainPaths[chainPathIndex].lkb.sub(_s.lkbRemove);
        // user receives the amount + the srcReward
        amountLD = amountSDtoLD(_s.amount.add(_s.eqReward));
        _safeTransfer(token, _to, amountLD);
        emit SwapRemote(_to, _s.amount.add(_s.eqReward), _s.protocolFee, _s.eqFee);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal   ->                         redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocalCallback(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        address _to,
        uint256 _amountSD,
        uint256 _amountToMintSD
    ) external nonReentrant onlyRouter {
        if (_amountToMintSD > 0) {
            _mintLocal(_to, amountSDtoLD(_amountToMintSD), false, false);
        }
        ChainPath storage cp = getAndCheckCP(_srcChainId, _srcPoolId);
        cp.lkb = cp.lkb.sub(_amountSD);
        uint256 amountLD = amountSDtoLD(_amountSD);
        _safeTransfer(token, _to, amountLD);
        emit RedeemLocalCallback(_to, _amountSD, _amountToMintSD);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal(amount)   ->               redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocalCheckOnRemote(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        uint256 _amountSD
    ) external nonReentrant onlyRouter returns (uint256 swapAmount, uint256 mintAmount) {
        ChainPath storage cp = getAndCheckCP(_srcChainId, _srcPoolId);
        if (_amountSD > cp.balance) {
            mintAmount = _amountSD - cp.balance;
            swapAmount = cp.balance;
            cp.balance = 0;
        } else {
            cp.balance = cp.balance.sub(_amountSD);
            swapAmount = _amountSD;
            mintAmount = 0;
        }
        emit WithdrawRemote(_srcChainId, _srcPoolId, swapAmount, mintAmount);
    }
    //---------------------------------------------------------------------------
    // DAO Calls
    function createChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint256 _weight
    ) external onlyRouter {
        for (uint256 i = 0; i < chainPaths.length; ++i) {
            ChainPath memory cp = chainPaths[i];
            bool exists = cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId;
            require(!exists, "Stargate: cant createChainPath of existing dstChainId and _dstPoolId");
        }
        totalWeight = totalWeight.add(_weight);
        chainPathIndexLookup[_dstChainId][_dstPoolId] = chainPaths.length;
        chainPaths.push(ChainPath(false, _dstChainId, _dstPoolId, _weight, 0, 0, 0, 0));
        emit ChainPathUpdate(_dstChainId, _dstPoolId, _weight);
    }
    function setWeightForChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint16 _weight
    ) external onlyRouter {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        totalWeight = totalWeight.sub(cp.weight).add(_weight);
        cp.weight = _weight;
        emit ChainPathUpdate(_dstChainId, _dstPoolId, _weight);
    }
    function setFee(uint256 _mintFeeBP) external onlyRouter {
        require(_mintFeeBP <= BP_DENOMINATOR, "Bridge: cum fees > 100%");
        mintFeeBP = _mintFeeBP;
        emit FeesUpdated(mintFeeBP);
    }
    function setFeeLibrary(address _feeLibraryAddr) external onlyRouter {
        require(_feeLibraryAddr != address(0x0), "Stargate: fee library cant be 0x0");
        feeLibrary = _feeLibraryAddr;
        emit FeeLibraryUpdated(_feeLibraryAddr);
    }
    function setSwapStop(bool _swapStop) external onlyRouter {
        stopSwap = _swapStop;
        emit StopSwapUpdated(_swapStop);
    }
    function setDeltaParam(
        bool _batched,
        uint256 _swapDeltaBP,
        uint256 _lpDeltaBP,
        bool _defaultSwapMode,
        bool _defaultLPMode
    ) external onlyRouter {
        require(_swapDeltaBP <= BP_DENOMINATOR && _lpDeltaBP <= BP_DENOMINATOR, "Stargate: wrong Delta param");
        batched = _batched;
        swapDeltaBP = _swapDeltaBP;
        lpDeltaBP = _lpDeltaBP;
        defaultSwapMode = _defaultSwapMode;
        defaultLPMode = _defaultLPMode;
        emit DeltaParamUpdated(_batched, _swapDeltaBP, _lpDeltaBP, _defaultSwapMode, _defaultLPMode);
    }
    function callDelta(bool _fullMode) external onlyRouter {
        _delta(_fullMode);
    }
    function activateChainPath(uint16 _dstChainId, uint256 _dstPoolId) external onlyRouter {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == false, "Stargate: chainPath is already active");
        // this func will only be called once
        cp.ready = true;
    }
    function withdrawProtocolFeeBalance(address _to) external onlyRouter {
        if (protocolFeeBalance > 0) {
            uint256 amountOfLD = amountSDtoLD(protocolFeeBalance);
            protocolFeeBalance = 0;
            _safeTransfer(token, _to, amountOfLD);
            emit WithdrawProtocolFeeBalance(_to, amountOfLD);
        }
    }
    function withdrawMintFeeBalance(address _to) external onlyRouter {
        if (mintFeeBalance > 0) {
            uint256 amountOfLD = amountSDtoLD(mintFeeBalance);
            mintFeeBalance = 0;
            _safeTransfer(token, _to, amountOfLD);
            emit WithdrawMintFeeBalance(_to, amountOfLD);
        }
    }
    //---------------------------------------------------------------------------
    // INTERNAL
    // Conversion Helpers
    //---------------------------------------------------------------------------
    function amountLPtoLD(uint256 _amountLP) external view returns (uint256) {
        return amountSDtoLD(_amountLPtoSD(_amountLP));
    }
    function _amountLPtoSD(uint256 _amountLP) internal view returns (uint256) {
        require(totalSupply > 0, "Stargate: cant convert LPtoSD when totalSupply == 0");
        return _amountLP.mul(totalLiquidity).div(totalSupply);
    }
    function _amountSDtoLP(uint256 _amountSD) internal view returns (uint256) {
        require(totalLiquidity > 0, "Stargate: cant convert SDtoLP when totalLiq == 0");
        return _amountSD.mul(totalSupply).div(totalLiquidity);
    }
    function amountSDtoLD(uint256 _amount) internal view returns (uint256) {
        return _amount.mul(convertRate);
    }
    function amountLDtoSD(uint256 _amount) internal view returns (uint256) {
        return _amount.div(convertRate);
    }
    function getAndCheckCP(uint16 _dstChainId, uint256 _dstPoolId) internal view returns (ChainPath storage) {
        require(chainPaths.length > 0, "Stargate: no chainpaths exist");
        ChainPath storage cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        require(cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId, "Stargate: local chainPath does not exist");
        return cp;
    }
    function getChainPath(uint16 _dstChainId, uint256 _dstPoolId) external view returns (ChainPath memory) {
        ChainPath memory cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        require(cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId, "Stargate: local chainPath does not exist");
        return cp;
    }
    function _burnLocal(address _from, uint256 _amountLP) internal returns (uint256) {
        require(totalSupply > 0, "Stargate: cant burn when totalSupply == 0");
        uint256 amountOfLPTokens = balanceOf[_from];
        require(amountOfLPTokens >= _amountLP, "Stargate: not enough LP tokens to burn");
        uint256 amountSD = _amountLP.mul(totalLiquidity).div(totalSupply);
        //subtract totalLiquidity accordingly
        totalLiquidity = totalLiquidity.sub(amountSD);
        _burn(_from, _amountLP);
        emit Burn(_from, _amountLP, amountSD);
        return amountSD;
    }
    function _delta(bool fullMode) internal {
        if (deltaCredit > 0 && totalWeight > 0) {
            uint256 cpLength = chainPaths.length;
            uint256[] memory deficit = new uint256[](cpLength);
            uint256 totalDeficit = 0;
            // algorithm steps 6-9: calculate the total and the amounts required to get to balance state
            for (uint256 i = 0; i < cpLength; ++i) {
                ChainPath storage cp = chainPaths[i];
                // (liquidity * (weight/totalWeight)) - (lkb+credits)
                uint256 balLiq = totalLiquidity.mul(cp.weight).div(totalWeight);
                uint256 currLiq = cp.lkb.add(cp.credits);
                if (balLiq > currLiq) {
                    // save gas since we know balLiq > currLiq and we know deficit[i] > 0
                    deficit[i] = balLiq - currLiq;
                    totalDeficit = totalDeficit.add(deficit[i]);
                }
            }
            // indicates how much delta credit is distributed
            uint256 spent;
            // handle credits with 2 tranches. the [ < totalDeficit] [excessCredit]
            // run full Delta, allocate all credits
            if (totalDeficit == 0) {
                // only fullMode delta will allocate excess credits
                if (fullMode && deltaCredit > 0) {
                    // credit ChainPath by weights
                    for (uint256 i = 0; i < cpLength; ++i) {
                        ChainPath storage cp = chainPaths[i];
                        // credits = credits + toBalanceChange + remaining allocation based on weight
                        uint256 amtToCredit = deltaCredit.mul(cp.weight).div(totalWeight);
                        spent = spent.add(amtToCredit);
                        cp.credits = cp.credits.add(amtToCredit);
                    }
                } // else do nth
            } else if (totalDeficit <= deltaCredit) {
                if (fullMode) {
                    // algorithm step 13: calculate amount to disperse to bring to balance state or as close as possible
                    uint256 excessCredit = deltaCredit - totalDeficit;
                    // algorithm steps 14-16: calculate credits
                    for (uint256 i = 0; i < cpLength; ++i) {
                        if (deficit[i] > 0) {
                            ChainPath storage cp = chainPaths[i];
                            // credits = credits + deficit + remaining allocation based on weight
                            uint256 amtToCredit = deficit[i].add(excessCredit.mul(cp.weight).div(totalWeight));
                            spent = spent.add(amtToCredit);
                            cp.credits = cp.credits.add(amtToCredit);
                        }
                    }
                } else {
                    // totalDeficit <= deltaCredit but not running fullMode
                    // credit chainPaths as is if any deficit, not using all deltaCredit
                    for (uint256 i = 0; i < cpLength; ++i) {
                        if (deficit[i] > 0) {
                            ChainPath storage cp = chainPaths[i];
                            uint256 amtToCredit = deficit[i];
                            spent = spent.add(amtToCredit);
                            cp.credits = cp.credits.add(amtToCredit);
                        }
                    }
                }
            } else {
                // totalDeficit > deltaCredit, fullMode or not, normalize the deficit by deltaCredit
                for (uint256 i = 0; i < cpLength; ++i) {
                    if (deficit[i] > 0) {
                        ChainPath storage cp = chainPaths[i];
                        uint256 proportionalDeficit = deficit[i].mul(deltaCredit).div(totalDeficit);
                        spent = spent.add(proportionalDeficit);
                        cp.credits = cp.credits.add(proportionalDeficit);
                    }
                }
            }
            // deduct the amount of credit sent
            deltaCredit = deltaCredit.sub(spent);
        }
    }
    function _mintLocal(
        address _to,
        uint256 _amountLD,
        bool _feesEnabled,
        bool _creditDelta
    ) internal returns (uint256 amountSD) {
        require(totalWeight > 0, "Stargate: No ChainPaths exist");
        amountSD = amountLDtoSD(_amountLD);
        uint256 mintFeeSD = 0;
        if (_feesEnabled) {
            mintFeeSD = amountSD.mul(mintFeeBP).div(BP_DENOMINATOR);
            amountSD = amountSD.sub(mintFeeSD);
            mintFeeBalance = mintFeeBalance.add(mintFeeSD);
        }
        if (_creditDelta) {
            deltaCredit = deltaCredit.add(amountSD);
        }
        uint256 amountLPTokens = amountSD;
        if (totalSupply != 0) {
            amountLPTokens = amountSD.mul(totalSupply).div(totalLiquidity);
        }
        totalLiquidity = totalLiquidity.add(amountSD);
        _mint(_to, amountLPTokens);
        emit Mint(_to, amountLPTokens, amountSD, mintFeeSD);
        // add to credits and call delta. short circuit to save gas
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultLPMode);
        }
    }
    function _safeTransfer(
        address _token,
        address _to,
        uint256 _value
    ) private {
        (bool success, bytes memory data) = _token.call(abi.encodeWithSelector(SELECTOR, _to, _value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "Stargate: TRANSFER_FAILED");
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    constructor () {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
contract LPTokenERC20 {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    string public name;
    string public symbol;
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    // set in constructor
    bytes32 public DOMAIN_SEPARATOR;
    //---------------------------------------------------------------------------
    // VARIABLES
    uint256 public decimals;
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    mapping(address => uint256) public nonces;
    //---------------------------------------------------------------------------
    // EVENTS
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);
    constructor(string memory _name, string memory _symbol) {
        name = _name;
        symbol = _symbol;
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name)),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
    }
    function _mint(address to, uint256 value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }
    function _burn(address from, uint256 value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }
    function _approve(
        address owner,
        address spender,
        uint256 value
    ) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }
    function _transfer(
        address from,
        address to,
        uint256 value
    ) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }
    function approve(address spender, uint256 value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }
    function transfer(address to, uint256 value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool) {
        if (allowance[from][msg.sender] != uint256(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender].add(addedValue));
        return true;
    }
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(deadline >= block.timestamp, "Bridge: EXPIRED");
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\\x19\\x01",
                DOMAIN_SEPARATOR,
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress != address(0) && recoveredAddress == owner, "Bridge: INVALID_SIGNATURE");
        _approve(owner, spender, value);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.7.6;
pragma abicoder v2;
import "../Pool.sol";
interface IStargateFeeLibrary {
    function getFees(
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint16 _dstChainId,
        address _from,
        uint256 _amountSD
    ) external returns (Pool.SwapObj memory s);
    function getVersion() external view returns (string memory);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
import "../interfaces/IStargateFeeLibrary.sol";
import "../Pool.sol";
import "../Factory.sol";
import "../interfaces/IStargateLPStaking.sol";
import "../chainlink/interfaces/AggregatorV3Interface.sol";
import "../lzApp/LzApp.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
///@notice Stargate fee library maintains the fees it costs to go from one pool to another across chains
/// The price feeds are eagerly updated by off-chain actors who watch the shouldCallUpdateTokenPrices() and call updateTokenPrices() if required
contract StargateFeeLibraryV07 is LzApp, IStargateFeeLibrary {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // VARIABLES
    // equilibrium func params. all in BPs * 10 ^ 2, i.e. 1 % = 10 ^ 6 units
    uint256 public constant DENOMINATOR = 1e18;
    uint256 public constant DELTA_1 = 6000 * 1e14;
    uint256 public constant DELTA_2 = 500 * 1e14;
    uint256 public constant LAMBDA_1 = 40 * 1e14;
    uint256 public constant LAMBDA_2 = 9960 * 1e14;
    // fee/reward bps
    uint256 public constant LP_FEE = 1 * 1e14;
    uint256 public constant PROTOCOL_FEE = 9 * 1e14;
    uint256 public constant PROTOCOL_FEE_FOR_SAME_TOKEN = 5 * 1e14;
    uint256 public constant EQ_REWARD_THRESHOLD = 6 * 1e14;
    uint256 public constant PROTOCOL_SUBSIDY = 3 * 1e13;
    // price and state thresholds, may be configurable in the future
    uint8 public constant PRICE_SHARED_DECIMALS = 8; // for price normalization
    uint256 public constant ONE_BPS_PRICE_CHANGE_THRESHOLD = 1 * 1e14;
    uint256 public constant PRICE_DRIFT_THRESHOLD = 10 * 1e14; // 10 bps
    uint256 public constant PRICE_DEPEG_THRESHOLD = 150 * 1e14; // 150 bps
    mapping(address => bool) public whitelist;
    mapping(uint256 => uint256) public poolIdToLpId; // poolId -> index of the pool in the lpStaking contract
    Factory public immutable factory;
    mapping(uint256 => address) public poolIdToPriceFeed; // poolId -> priceFeed
    // poolId1 -> poolId2 -> remoteChainIds, poolId1 < poolId2
    mapping(uint256 => mapping(uint256 => uint16[])) internal poolPairToRemoteChainIds;
    mapping(uint256 => uint256) public poolIdToPriceSD; // poolId -> price in shared decimals
    mapping(uint16 => bytes) public defaultAdapterParams; // for price sync, chainId -> params
    mapping(uint256 => address) public stargatePoolIdToLPStaking;
    enum PriceDeviationState {
        Normal,
        Drift,
        Depeg
    }
    event PriceUpdated(uint256 indexed poolId, uint256 priceSD);
    modifier notSamePool(uint256 _poolId1, uint256 _poolId2) {
        require(_poolId1 != _poolId2, "FeeLibrary: _poolId1 == _poolId2");
        _;
    }
    constructor(
        address _factory,
        address _endpoint
    ) LzApp(_endpoint) {
        require(_factory != address(0x0), "FeeLibrary: Factory cannot be 0x0");
        require(_endpoint != address(0x0), "FeeLibrary: Endpoint cannot be 0x0");
        factory = Factory(_factory);
    }
    // --------------------- ONLY OWNER ---------------------
    function whiteList(address _from, bool _whiteListed) external onlyOwner {
        whitelist[_from] = _whiteListed;
    }
    function setPoolToLpId(uint256 _poolId, uint256 _lpId) external onlyOwner {
        poolIdToLpId[_poolId] = _lpId;
    }
    // for those chains where to get the price from oracle and sync to other chains
    function setTokenPriceFeed(uint256 _poolId, address _priceFeedAddress) external onlyOwner {
        poolIdToPriceFeed[_poolId] = _priceFeedAddress;
    }
    function setStargatePoolIdToLPStakingAddress(uint256 _poolId, address _lpStaking) external onlyOwner {
        stargatePoolIdToLPStaking[_poolId] = _lpStaking;
    }
    function initTokenPrice(uint256 _poolId, uint256 _priceSD) external onlyOwner {
        poolIdToPriceSD[_poolId] = _priceSD;
        emit PriceUpdated(_poolId, _priceSD);
    }
    function setRemoteChains(
        uint256 _poolId1,
        uint256 _poolId2,
        uint16[] calldata _remoteChainIds
    ) external onlyOwner notSamePool(_poolId1, _poolId2) {
        if (_poolId1 < _poolId2) {
            poolPairToRemoteChainIds[_poolId1][_poolId2] = _remoteChainIds;
        } else {
            poolPairToRemoteChainIds[_poolId2][_poolId1] = _remoteChainIds;
        }
    }
    function setDefaultAdapterParams(uint16 _remoteChainId, bytes calldata _adapterParams) external onlyOwner {
        defaultAdapterParams[_remoteChainId] = _adapterParams;
    }
    // Override the renounce ownership inherited by zeppelin ownable
    function renounceOwnership() public override onlyOwner {}
    // --------------------- PUBLIC FUNCTIONS ---------------------
    ///@notice update the stored token price pair for the associated pool pair
    ///@dev anyone can update and sync price at any time even though the price is not changed
    ///@param _poolId1 one pool id of the pool pair
    ///@param _poolId2 the other pool id of the pool pair
    function updateTokenPrices(uint256 _poolId1, uint256 _poolId2) external payable notSamePool(_poolId1, _poolId2) {
        // get new prices from price feed
        uint256 newPrice1 = _getLatestPriceSDFromPriceFeed(_poolId1);
        uint256 newPrice2 = _getLatestPriceSDFromPriceFeed(_poolId2);
        // store the new prices
        poolIdToPriceSD[_poolId1] = newPrice1;
        poolIdToPriceSD[_poolId2] = newPrice2;
        emit PriceUpdated(_poolId1, newPrice1);
        emit PriceUpdated(_poolId2, newPrice2);
        // sync the prices to remote pools
        uint16[] memory remoteChainIds = getRemoteChains(_poolId1, _poolId2);
        require(remoteChainIds.length > 0, "FeeLibrary: invalid pool pair");
        bytes memory payload = abi.encode(_poolId1, newPrice1, _poolId2, newPrice2);
        for (uint256 i = 0; i < remoteChainIds.length; i++) {
            uint16 remoteChainId = remoteChainIds[i];
            address refundAddress = i == remoteChainIds.length - 1? msg.sender : address(this); // refund to msg.sender only for the last call
            _lzSend(remoteChainId, payload, payable(refundAddress), address(0), defaultAdapterParams[remoteChainId], address(this).balance);
        }
    }
    // --------------------- VIEW FUNCTIONS ---------------------
    ///@notice get the fees for a swap. typically called from the router via the pool
    function getFees(
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint16 _dstChainId,
        address _from,
        uint256 _amountSD
    ) external view override returns (Pool.SwapObj memory s) {
        // calculate the equilibrium reward
        bool whitelisted = whitelist[_from];
        s.eqReward = getEqReward(_srcPoolId, _amountSD, whitelisted); // protocol fee is 0 if whitelisted
        // calculate the equilibrium fee
        bool hasEqReward = s.eqReward > 0;
        uint256 protocolSubsidy;
        (s.eqFee, protocolSubsidy) = getEquilibriumFee(_srcPoolId, _dstPoolId, _dstChainId, _amountSD, whitelisted, hasEqReward);
        // calculate protocol and lp fee
        (s.protocolFee, s.lpFee) = getProtocolAndLpFee(_srcPoolId, _dstPoolId, _dstChainId, _amountSD, protocolSubsidy, whitelisted);
        // cap the reward at the sum of protocol fee and lp fee by increasing the protocol fee
        if (!whitelisted) {
            uint256 rewardCap = s.protocolFee.add(s.lpFee);
            if (s.eqReward > rewardCap) {
                uint256 diff = s.eqReward.sub(rewardCap);
                s.protocolFee = s.protocolFee.add(diff);
            }
        }
        // calculate drift fee
        uint256 driftFee = getDriftFee(_srcPoolId, _dstPoolId, _amountSD, whitelisted);
        s.protocolFee = s.protocolFee.add(driftFee);
        if (_amountSD < s.lpFee.add(s.eqFee).add(s.protocolFee)) {
            s.protocolFee = _amountSD.sub(s.lpFee).sub(s.eqFee);
        }
        return s;
    }
    ///@notice quote fee for price update and sync to remote chains
    ///@dev call this for value to attach to call to update token prices
    function quoteFeeForPriceUpdate(uint256 _poolId1, uint256 _poolId2) external view notSamePool(_poolId1, _poolId2) returns (uint256) {
        uint256 total = 0;
        uint16[] memory remoteChainIds = getRemoteChains(_poolId1, _poolId2);
        require(remoteChainIds.length > 0, "FeeLibrary: invalid pool pair");
        bytes memory payload = abi.encode(_poolId1, uint256(0), _poolId2, uint256(0)); // mock the payload
        for (uint256 i = 0; i < remoteChainIds.length; i++) {
            uint16 remoteChainId = remoteChainIds[i];
            (uint256 fee, ) = lzEndpoint.estimateFees(remoteChainId, address(this), payload, false, defaultAdapterParams[remoteChainId]);
            total = total.add(fee);
        }
        return total;
    }
    ///@notice function to check if update token prices should be called
    ///@dev typically called by an off-chain watcher and if returns true updateTokenPrices is called
    ///@param _poolId1 one pool id of the pool pair
    ///@param _poolId2 the other pool id of the pool pair
    ///@return bool true if updateTokenPrice should be called, false otherwise
    function shouldCallUpdateTokenPrices(uint256 _poolId1, uint256 _poolId2) external view notSamePool(_poolId1, _poolId2) returns (bool) {
        // current price and state
        uint256 currentPriceSD1 = poolIdToPriceSD[_poolId1];
        uint256 currentPriceSD2 = poolIdToPriceSD[_poolId2];
        (PriceDeviationState currentState, uint256 currentDiff, bool currentLt) = _getPriceDiffAndDeviationState(currentPriceSD1, currentPriceSD2);
        // new price and state
        uint256 newPriceSD1 = _getLatestPriceSDFromPriceFeed(_poolId1);
        uint256 newPriceSD2 = _getLatestPriceSDFromPriceFeed(_poolId2);
        (PriceDeviationState newState, uint256 newDiff, bool newLt) = _getPriceDiffAndDeviationState(newPriceSD1, newPriceSD2);
        // if state has changed then price update is required
        if (currentState != newState) {
            return true;
        }
        // 1. if state keeps normal, then no need to update
        // 2. if state is drift or depeg, but the token with higher price has changed, then update is required
        // 3. if state is depeg and the token with higher price has not changed, then no need to update
        if (newState == PriceDeviationState.Normal) {
            return false;
        } else if (currentLt != newLt) {
            return true;
        } else if (newState == PriceDeviationState.Depeg) {
            return false;
        }
        // if state is drift and the difference is not less than 1bps, then update is required
        uint256 diffDelta = newDiff > currentDiff ? newDiff.sub(currentDiff) : currentDiff.sub(newDiff);
        return diffDelta >= ONE_BPS_PRICE_CHANGE_THRESHOLD;
    }
    function getEqReward(
        uint256 _srcPoolId,
        uint256 _amountSD,
        bool _whitelisted
    ) public view returns (uint256) {
        Pool pool = factory.getPool(_srcPoolId);
        uint256 currentAssetSD = _getPoolBalanceSD(pool);
        uint256 lpAsset = pool.totalLiquidity();
        uint256 rewardPoolSize = pool.eqFeePool();
        if (lpAsset <= currentAssetSD) {
            return 0;
        }
        uint256 poolDeficit = lpAsset.sub(currentAssetSD);
        uint256 rate = rewardPoolSize.mul(DENOMINATOR).div(poolDeficit);
        if (rate <= EQ_REWARD_THRESHOLD && !_whitelisted) {
            return 0;
        }
        uint256 eqReward = _amountSD.mul(rate).div(DENOMINATOR);
        eqReward = eqReward > rewardPoolSize ? rewardPoolSize : eqReward;
        return eqReward;
    }
    function getEquilibriumFee(
        uint256 srcPoolId,
        uint256 dstPoolId,
        uint16 dstChainId,
        uint256 amountSD,
        bool whitelisted,
        bool hasEqReward
    ) public view returns (uint256, uint256) {
        if (whitelisted) {
            return (0, 0);
        }
        Pool.ChainPath memory chainPath = factory.getPool(srcPoolId).getChainPath(dstChainId, dstPoolId);
        uint256 idealBalance = chainPath.idealBalance;
        uint256 beforeBalance = chainPath.balance;
        require(beforeBalance >= amountSD, "FeeLibrary: not enough balance");
        uint256 afterBalance = beforeBalance.sub(amountSD);
        uint256 safeZoneMax = idealBalance.mul(DELTA_1).div(DENOMINATOR);
        uint256 safeZoneMin = idealBalance.mul(DELTA_2).div(DENOMINATOR);
        uint256 eqFee = 0;
        uint256 protocolSubsidy = 0;
        uint256 amountSD_ = amountSD; // stack too deep
        if (afterBalance >= safeZoneMax) {
            // no fee zone, protocol subsidize it.
            eqFee = amountSD_.mul(PROTOCOL_SUBSIDY).div(DENOMINATOR);
            // no subsidy if has eqReward
            if (!hasEqReward) {
                protocolSubsidy = eqFee;
            }
        } else if (afterBalance >= safeZoneMin) {
            // safe zone
            uint256 proxyBeforeBalance = beforeBalance < safeZoneMax ? beforeBalance : safeZoneMax;
            eqFee = _getTrapezoidArea(LAMBDA_1, 0, safeZoneMax, safeZoneMin, proxyBeforeBalance, afterBalance);
        } else {
            // danger zone
            if (beforeBalance >= safeZoneMin) {
                // across 2 or 3 zones
                // part 1
                uint256 proxyBeforeBalance = beforeBalance < safeZoneMax ? beforeBalance : safeZoneMax;
                eqFee = eqFee.add(_getTrapezoidArea(LAMBDA_1, 0, safeZoneMax, safeZoneMin, proxyBeforeBalance, safeZoneMin));
                // part 2
                eqFee = eqFee.add(_getTrapezoidArea(LAMBDA_2, LAMBDA_1, safeZoneMin, 0, safeZoneMin, afterBalance));
            } else {
                // only in danger zone
                // part 2 only
                uint256 beforeBalance_ = beforeBalance; // Stack too deep
                eqFee = eqFee.add(_getTrapezoidArea(LAMBDA_2, LAMBDA_1, safeZoneMin, 0, beforeBalance_, afterBalance));
            }
        }
        return (eqFee, protocolSubsidy);
    }
    function getProtocolAndLpFee(
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint16, // _dstChainId
        uint256 _amountSD,
        uint256 _protocolSubsidy,
        bool _whitelisted
    ) public view returns (uint256, uint256) {
        if (_whitelisted) {
            return (0, 0);
        }
        uint256 protocolFeeBps = _srcPoolId == _dstPoolId ? PROTOCOL_FEE_FOR_SAME_TOKEN : PROTOCOL_FEE;
        uint256 amountSD = _amountSD; // Stack too deep
        uint256 srcPoolId = _srcPoolId;
        uint256 protocolFee = amountSD.mul(protocolFeeBps).div(DENOMINATOR).sub(_protocolSubsidy);
        uint256 lpFee = amountSD.mul(LP_FEE).div(DENOMINATOR);
        // when there are active emissions, give the lp fee to the protocol
        // lookup LPStaking[Time] address. If it
        address lpStakingAddr = stargatePoolIdToLPStaking[srcPoolId];
        if(lpStakingAddr != address(0x0)){
            IStargateLPStaking lpStaking = IStargateLPStaking(lpStakingAddr);
            (, uint256 allocPoint, , ) = lpStaking.poolInfo(poolIdToLpId[srcPoolId]);
            if (allocPoint > 0) {
                protocolFee = protocolFee.add(lpFee);
                lpFee = 0;
            }
        }
        return (protocolFee, lpFee);
    }
    function getDriftFee(
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint256 _amountSD,
        bool _whitelisted
    ) public view returns (uint256) {
        if (_srcPoolId == _dstPoolId) {
            return 0;
        }
        // get current prices and state
        uint256 srcPriceSD = poolIdToPriceSD[_srcPoolId];
        uint256 dstPriceSD = poolIdToPriceSD[_dstPoolId];
        (PriceDeviationState state, , bool lt) = _getPriceDiffAndDeviationState(srcPriceSD, dstPriceSD);
        // there is no drift fee if
        // 1. state is normal
        // 2. swap from high price to low price
        if (!lt || state == PriceDeviationState.Normal) {
            return 0;
        }
        require(state != PriceDeviationState.Depeg, "FeeLibrary: _srcPoolId depeg");
        // if whitelisted, then no drift fee
        if (_whitelisted) {
            return 0;
        }
        uint256 amountSDAfterFee = _amountSD.mul(srcPriceSD).div(dstPriceSD);
        return _amountSD.sub(amountSDAfterFee);
    }
    function getRemoteChains(uint256 _poolId1, uint256 _poolId2) public view returns (uint16[] memory) {
        if (_poolId1 < _poolId2) {
            return poolPairToRemoteChainIds[_poolId1][_poolId2];
        } else {
            return poolPairToRemoteChainIds[_poolId2][_poolId1];
        }
    }
    function getVersion() external pure override returns (string memory) {
        return "7.1.0";
    }
    // --------------------- INTERNAL FUNCTIONS ---------------------
    function _getTrapezoidArea(
        uint256 lambda,
        uint256 yOffset,
        uint256 xUpperBound,
        uint256 xLowerBound,
        uint256 xStart,
        uint256 xEnd
    ) internal pure returns (uint256) {
        require(xEnd >= xLowerBound && xStart <= xUpperBound, "FeeLibrary: balance out of bound");
        uint256 xBoundWidth = xUpperBound.sub(xLowerBound);
        // xStartDrift = xUpperBound.sub(xStart);
        uint256 yStart = xUpperBound.sub(xStart).mul(lambda).div(xBoundWidth).add(yOffset);
        // xEndDrift = xUpperBound.sub(xEnd)
        uint256 yEnd = xUpperBound.sub(xEnd).mul(lambda).div(xBoundWidth).add(yOffset);
        // compute the area
        uint256 deltaX = xStart.sub(xEnd);
        return yStart.add(yEnd).mul(deltaX).div(2).div(DENOMINATOR);
    }
    function _blockingLzReceive(uint16, bytes memory, uint64, bytes memory _payload) internal override {
        (uint256 poolId1, uint256 priceSD1, uint256 poolId2, uint256 priceSD2) = abi.decode(_payload, (uint256, uint256, uint256, uint256));
        poolIdToPriceSD[poolId1] = priceSD1;
        poolIdToPriceSD[poolId2] = priceSD2;
        emit PriceUpdated(poolId1, priceSD1);
        emit PriceUpdated(poolId2, priceSD2);
    }
    ///@notice does an external call to the price feed address supplied and returns the scaled price
    function _getLatestPriceSDFromPriceFeed(uint256 _poolId) internal view returns (uint256) {
        address priceFeed = poolIdToPriceFeed[_poolId];
        require(priceFeed != address(0x0), "FeeLibrary: price feed not set");
        uint8 decimals = AggregatorV3Interface(priceFeed).decimals();
        (, int256 price, , ,) = AggregatorV3Interface(priceFeed).latestRoundData();
        require(price >= 0, "FeeLibrary: price is negative");
        return _scalePrice(uint256(price), decimals);
    }
    ///@notice looks at the two prices and determines if the state of the pair is normal, depeg or drift
    function _getPriceDiffAndDeviationState(uint256 _priceSD1, uint256 _priceSD2) internal pure returns (PriceDeviationState, uint256, bool) {
        // get absolute difference between the two prices
        (uint256 diff, bool lt) = _getAbsoluteDiffAsBps(_priceSD1, _priceSD2);
        PriceDeviationState state;
        if (diff <= PRICE_DRIFT_THRESHOLD) {
            state = PriceDeviationState.Normal;
        } else if (diff >= PRICE_DEPEG_THRESHOLD) {
            state = PriceDeviationState.Depeg;
        } else {
            state = PriceDeviationState.Drift;
        }
        return (state, diff, lt);
    }
    function _scalePrice(uint256 _price, uint8 _decimals) internal pure returns (uint256) {
        if (_decimals == PRICE_SHARED_DECIMALS) {
            return _price;
        }
        uint256 rate = _scaleRate(_decimals, PRICE_SHARED_DECIMALS);
        return _decimals < PRICE_SHARED_DECIMALS ? _price.mul(rate) : _price.div(rate);
    }
    /// @notice returns the absolute difference between two numbers as bps
    /// @return the absolute difference between two numbers as bps
    /// @return true if _a < _b, false otherwise
    function _getAbsoluteDiffAsBps(uint256 _a, uint256 _b) internal pure returns (uint256, bool) {
        if (_a > _b) {
            return (_a.sub(_b).mul(DENOMINATOR).div(_a), false);
        } else if (_a == _b) {
            return (0, false);
        } else {
            return (_b.sub(_a).mul(DENOMINATOR).div(_b), true);
        }
    }
    function _scaleRate(uint8 _decimals, uint8 _sharedDecimals) internal pure returns (uint256) {
        uint256 diff = _decimals > _sharedDecimals? _decimals - _sharedDecimals : _sharedDecimals - _decimals;
        require(diff <= 20, "FeeLibrary: diff of decimals is too large");
        return 10 ** diff;
    }
    function _getPoolBalanceSD(Pool _pool) internal view returns (uint256) {
        return IERC20(_pool.token()).balanceOf(address(_pool)).div(_pool.convertRate());
    }
    receive() external payable {} // receive ETH from lz endpoint
}// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroReceiver {
    // @notice LayerZero endpoint will invoke this function to deliver the message on the destination
    // @param _srcChainId - the source endpoint identifier
    // @param _srcAddress - the source sending contract address from the source chain
    // @param _nonce - the ordered message nonce
    // @param _payload - the signed payload is the UA bytes has encoded to be sent
    function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) external;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
import "./ILayerZeroUserApplicationConfig.sol";
interface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {
    // @notice send a LayerZero message to the specified address at a LayerZero endpoint.
    // @param _dstChainId - the destination chain identifier
    // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains
    // @param _payload - a custom bytes payload to send to the destination contract
    // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address
    // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction
    // @param _adapterParams - parameters for custom functionality. e.g. receive airdropped native gas from the relayer on destination
    function send(uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;
    // @notice used by the messaging library to publish verified payload
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source contract (as bytes) at the source chain
    // @param _dstAddress - the address on destination chain
    // @param _nonce - the unbound message ordering nonce
    // @param _gasLimit - the gas limit for external contract execution
    // @param _payload - verified payload to send to the destination contract
    function receivePayload(uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload) external;
    // @notice get the inboundNonce of a receiver from a source chain which could be EVM or non-EVM chain
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64);
    // @notice get the outboundNonce from this source chain which, consequently, is always an EVM
    // @param _srcAddress - the source chain contract address
    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64);
    // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery
    // @param _dstChainId - the destination chain identifier
    // @param _userApplication - the user app address on this EVM chain
    // @param _payload - the custom message to send over LayerZero
    // @param _payInZRO - if false, user app pays the protocol fee in native token
    // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain
    function estimateFees(uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);
    // @notice get this Endpoint's immutable source identifier
    function getChainId() external view returns (uint16);
    // @notice the interface to retry failed message on this Endpoint destination
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    // @param _payload - the payload to be retried
    function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external;
    // @notice query if any STORED payload (message blocking) at the endpoint.
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool);
    // @notice query if the _libraryAddress is valid for sending msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getSendLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the _libraryAddress is valid for receiving msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getReceiveLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the non-reentrancy guard for send() is on
    // @return true if the guard is on. false otherwise
    function isSendingPayload() external view returns (bool);
    // @notice query if the non-reentrancy guard for receive() is on
    // @return true if the guard is on. false otherwise
    function isReceivingPayload() external view returns (bool);
    // @notice get the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _userApplication - the contract address of the user application
    // @param _configType - type of configuration. every messaging library has its own convention.
    function getConfig(uint16 _version, uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);
    // @notice get the send() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getSendVersion(address _userApplication) external view returns (uint16);
    // @notice get the lzReceive() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getReceiveVersion(address _userApplication) external view returns (uint16);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroUserApplicationConfig {
    // @notice set the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _configType - type of configuration. every messaging library has its own convention.
    // @param _config - configuration in the bytes. can encode arbitrary content.
    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external;
    // @notice set the send() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setSendVersion(uint16 _version) external;
    // @notice set the lzReceive() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setReceiveVersion(uint16 _version) external;
    // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload
    // @param _srcChainId - the chainId of the source chain
    // @param _srcAddress - the contract address of the source contract at the source chain
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    constructor () {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
contract LPTokenERC20 {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    string public name;
    string public symbol;
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    // set in constructor
    bytes32 public DOMAIN_SEPARATOR;
    //---------------------------------------------------------------------------
    // VARIABLES
    uint256 public decimals;
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    mapping(address => uint256) public nonces;
    //---------------------------------------------------------------------------
    // EVENTS
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);
    constructor(string memory _name, string memory _symbol) {
        name = _name;
        symbol = _symbol;
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name)),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
    }
    function _mint(address to, uint256 value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }
    function _burn(address from, uint256 value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }
    function _approve(
        address owner,
        address spender,
        uint256 value
    ) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }
    function _transfer(
        address from,
        address to,
        uint256 value
    ) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }
    function approve(address spender, uint256 value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }
    function transfer(address to, uint256 value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool) {
        if (allowance[from][msg.sender] != uint256(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender].add(addedValue));
        return true;
    }
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(deadline >= block.timestamp, "Bridge: EXPIRED");
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\\x19\\x01",
                DOMAIN_SEPARATOR,
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress != address(0) && recoveredAddress == owner, "Bridge: INVALID_SIGNATURE");
        _approve(owner, spender, value);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.7.6;
pragma abicoder v2;
import "../Pool.sol";
interface IStargateFeeLibrary {
    function getFees(
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint16 _dstChainId,
        address _from,
        uint256 _amountSD
    ) external returns (Pool.SwapObj memory s);
    function getVersion() external view returns (string memory);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
// imports
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./LPTokenERC20.sol";
import "./interfaces/IStargateFeeLibrary.sol";
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
/// Pool contracts on other chains and managed by the Stargate protocol.
contract Pool is LPTokenERC20, ReentrancyGuard {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)")));
    uint256 public constant BP_DENOMINATOR = 10000;
    //---------------------------------------------------------------------------
    // STRUCTS
    struct ChainPath {
        bool ready; // indicate if the counter chainPath has been created.
        uint16 dstChainId;
        uint256 dstPoolId;
        uint256 weight;
        uint256 balance;
        uint256 lkb;
        uint256 credits;
        uint256 idealBalance;
    }
    struct SwapObj {
        uint256 amount;
        uint256 eqFee;
        uint256 eqReward;
        uint256 lpFee;
        uint256 protocolFee;
        uint256 lkbRemove;
    }
    struct CreditObj {
        uint256 credits;
        uint256 idealBalance;
    }
    //---------------------------------------------------------------------------
    // VARIABLES
    // chainPath
    ChainPath[] public chainPaths; // list of connected chains with shared pools
    mapping(uint16 => mapping(uint256 => uint256)) public chainPathIndexLookup; // lookup for chainPath by chainId => poolId =>index
    // metadata
    uint256 public immutable poolId; // shared id between chains to represent same pool
    uint256 public sharedDecimals; // the shared decimals (lowest common decimals between chains)
    uint256 public localDecimals; // the decimals for the token
    uint256 public immutable convertRate; // the decimals for the token
    address public immutable token; // the token for the pool
    address public immutable router; // the token for the pool
    bool public stopSwap; // flag to stop swapping in extreme cases
    // Fee and Liquidity
    uint256 public totalLiquidity; // the total amount of tokens added on this side of the chain (fees + deposits - withdrawals)
    uint256 public totalWeight; // total weight for pool percentages
    uint256 public mintFeeBP; // fee basis points for the mint/deposit
    uint256 public protocolFeeBalance; // fee balance created from dao fee
    uint256 public mintFeeBalance; // fee balance created from mint fee
    uint256 public eqFeePool; // pool rewards in Shared Decimal format. indicate the total budget for reverse swap incentive
    address public feeLibrary; // address for retrieving fee params for swaps
    // Delta related
    uint256 public deltaCredit; // credits accumulated from txn
    bool public batched; // flag to indicate if we want batch processing.
    bool public defaultSwapMode; // flag for the default mode for swap
    bool public defaultLPMode; // flag for the default mode for lp
    uint256 public swapDeltaBP; // basis points of poolCredits to activate Delta in swap
    uint256 public lpDeltaBP; // basis points of poolCredits to activate Delta in liquidity events
    //---------------------------------------------------------------------------
    // EVENTS
    event Mint(address to, uint256 amountLP, uint256 amountSD, uint256 mintFeeAmountSD);
    event Burn(address from, uint256 amountLP, uint256 amountSD);
    event RedeemLocalCallback(address _to, uint256 _amountSD, uint256 _amountToMintSD);
    event Swap(
        uint16 chainId,
        uint256 dstPoolId,
        address from,
        uint256 amountSD,
        uint256 eqReward,
        uint256 eqFee,
        uint256 protocolFee,
        uint256 lpFee
    );
    event SendCredits(uint16 dstChainId, uint256 dstPoolId, uint256 credits, uint256 idealBalance);
    event RedeemRemote(uint16 chainId, uint256 dstPoolId, address from, uint256 amountLP, uint256 amountSD);
    event RedeemLocal(address from, uint256 amountLP, uint256 amountSD, uint16 chainId, uint256 dstPoolId, bytes to);
    event InstantRedeemLocal(address from, uint256 amountLP, uint256 amountSD, address to);
    event CreditChainPath(uint16 chainId, uint256 srcPoolId, uint256 amountSD, uint256 idealBalance);
    event SwapRemote(address to, uint256 amountSD, uint256 protocolFee, uint256 dstFee);
    event WithdrawRemote(uint16 srcChainId, uint256 srcPoolId, uint256 swapAmount, uint256 mintAmount);
    event ChainPathUpdate(uint16 dstChainId, uint256 dstPoolId, uint256 weight);
    event FeesUpdated(uint256 mintFeeBP);
    event FeeLibraryUpdated(address feeLibraryAddr);
    event StopSwapUpdated(bool swapStop);
    event WithdrawProtocolFeeBalance(address to, uint256 amountSD);
    event WithdrawMintFeeBalance(address to, uint256 amountSD);
    event DeltaParamUpdated(bool batched, uint256 swapDeltaBP, uint256 lpDeltaBP, bool defaultSwapMode, bool defaultLPMode);
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == router, "Stargate: only the router can call this method");
        _;
    }
    constructor(
        uint256 _poolId,
        address _router,
        address _token,
        uint256 _sharedDecimals,
        uint256 _localDecimals,
        address _feeLibrary,
        string memory _name,
        string memory _symbol
    ) LPTokenERC20(_name, _symbol) {
        require(_token != address(0x0), "Stargate: _token cannot be 0x0");
        require(_router != address(0x0), "Stargate: _router cannot be 0x0");
        poolId = _poolId;
        router = _router;
        token = _token;
        sharedDecimals = _sharedDecimals;
        decimals = uint8(_sharedDecimals);
        localDecimals = _localDecimals;
        convertRate = 10**(uint256(localDecimals).sub(sharedDecimals));
        totalWeight = 0;
        feeLibrary = _feeLibrary;
        //delta algo related
        batched = false;
        defaultSwapMode = true;
        defaultLPMode = true;
    }
    function getChainPathsLength() public view returns (uint256) {
        return chainPaths.length;
    }
    //---------------------------------------------------------------------------
    // LOCAL CHAIN FUNCTIONS
    function mint(address _to, uint256 _amountLD) external nonReentrant onlyRouter returns (uint256) {
        return _mintLocal(_to, _amountLD, true, true);
    }
    // Local                                    Remote
    // -------                                  ---------
    // swap             ->                      swapRemote
    function swap(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        address _from,
        uint256 _amountLD,
        uint256 _minAmountLD,
        bool newLiquidity
    ) external nonReentrant onlyRouter returns (SwapObj memory) {
        require(!stopSwap, "Stargate: swap func stopped");
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == true, "Stargate: counter chainPath is not ready");
        uint256 amountSD = amountLDtoSD(_amountLD);
        uint256 minAmountSD = amountLDtoSD(_minAmountLD);
        // request fee params from library
        SwapObj memory s = IStargateFeeLibrary(feeLibrary).getFees(poolId, _dstPoolId, _dstChainId, _from, amountSD);
        // equilibrium fee and reward. note eqFee/eqReward are separated from swap liquidity
        eqFeePool = eqFeePool.sub(s.eqReward);
        // update the new amount the user gets minus the fees
        s.amount = amountSD.sub(s.eqFee).sub(s.protocolFee).sub(s.lpFee);
        // users will also get the eqReward
        require(s.amount.add(s.eqReward) >= minAmountSD, "Stargate: slippage too high");
        // behaviours
        //     - protocolFee: booked, stayed and withdrawn at remote.
        //     - eqFee: booked, stayed and withdrawn at remote.
        //     - lpFee: booked and stayed at remote, can be withdrawn anywhere
        s.lkbRemove = amountSD.sub(s.lpFee).add(s.eqReward);
        // check for transfer solvency.
        require(cp.balance >= s.lkbRemove, "Stargate: dst balance too low");
        cp.balance = cp.balance.sub(s.lkbRemove);
        if (newLiquidity) {
            deltaCredit = deltaCredit.add(amountSD).add(s.eqReward);
        } else if (s.eqReward > 0) {
            deltaCredit = deltaCredit.add(s.eqReward);
        }
        // distribute credits on condition.
        if (!batched || deltaCredit >= totalLiquidity.mul(swapDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultSwapMode);
        }
        emit Swap(_dstChainId, _dstPoolId, _from, s.amount, s.eqReward, s.eqFee, s.protocolFee, s.lpFee);
        return s;
    }
    // Local                                    Remote
    // -------                                  ---------
    // sendCredits      ->                      creditChainPath
    function sendCredits(uint16 _dstChainId, uint256 _dstPoolId) external nonReentrant onlyRouter returns (CreditObj memory c) {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == true, "Stargate: counter chainPath is not ready");
        cp.lkb = cp.lkb.add(cp.credits);
        c.idealBalance = totalLiquidity.mul(cp.weight).div(totalWeight);
        c.credits = cp.credits;
        cp.credits = 0;
        emit SendCredits(_dstChainId, _dstPoolId, c.credits, c.idealBalance);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemRemote   ->                        swapRemote
    function redeemRemote(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        address _from,
        uint256 _amountLP
    ) external nonReentrant onlyRouter {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        uint256 amountSD = _burnLocal(_from, _amountLP);
        //run Delta
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultLPMode);
        }
        uint256 amountLD = amountSDtoLD(amountSD);
        emit RedeemRemote(_dstChainId, _dstPoolId, _from, _amountLP, amountLD);
    }
    function instantRedeemLocal(
        address _from,
        uint256 _amountLP,
        address _to
    ) external nonReentrant onlyRouter returns (uint256 amountSD) {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        uint256 _deltaCredit = deltaCredit; // sload optimization.
        uint256 _capAmountLP = _amountSDtoLP(_deltaCredit);
        if (_amountLP > _capAmountLP) _amountLP = _capAmountLP;
        amountSD = _burnLocal(_from, _amountLP);
        deltaCredit = _deltaCredit.sub(amountSD);
        uint256 amountLD = amountSDtoLD(amountSD);
        _safeTransfer(token, _to, amountLD);
        emit InstantRedeemLocal(_from, _amountLP, amountSD, _to);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal   ->                         redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocal(
        address _from,
        uint256 _amountLP,
        uint16 _dstChainId,
        uint256 _dstPoolId,
        bytes calldata _to
    ) external nonReentrant onlyRouter returns (uint256 amountSD) {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        // safeguard.
        require(chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]].ready == true, "Stargate: counter chainPath is not ready");
        amountSD = _burnLocal(_from, _amountLP);
        // run Delta
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(false);
        }
        emit RedeemLocal(_from, _amountLP, amountSD, _dstChainId, _dstPoolId, _to);
    }
    //---------------------------------------------------------------------------
    // REMOTE CHAIN FUNCTIONS
    // Local                                    Remote
    // -------                                  ---------
    // sendCredits      ->                      creditChainPath
    function creditChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        CreditObj memory _c
    ) external nonReentrant onlyRouter {
        ChainPath storage cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        cp.balance = cp.balance.add(_c.credits);
        if (cp.idealBalance != _c.idealBalance) {
            cp.idealBalance = _c.idealBalance;
        }
        emit CreditChainPath(_dstChainId, _dstPoolId, _c.credits, _c.idealBalance);
    }
    // Local                                    Remote
    // -------                                  ---------
    // swap             ->                      swapRemote
    function swapRemote(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        address _to,
        SwapObj memory _s
    ) external nonReentrant onlyRouter returns (uint256 amountLD) {
        // booking lpFee
        totalLiquidity = totalLiquidity.add(_s.lpFee);
        // booking eqFee
        eqFeePool = eqFeePool.add(_s.eqFee);
        // booking stargateFee
        protocolFeeBalance = protocolFeeBalance.add(_s.protocolFee);
        // update LKB
        uint256 chainPathIndex = chainPathIndexLookup[_srcChainId][_srcPoolId];
        chainPaths[chainPathIndex].lkb = chainPaths[chainPathIndex].lkb.sub(_s.lkbRemove);
        // user receives the amount + the srcReward
        amountLD = amountSDtoLD(_s.amount.add(_s.eqReward));
        _safeTransfer(token, _to, amountLD);
        emit SwapRemote(_to, _s.amount.add(_s.eqReward), _s.protocolFee, _s.eqFee);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal   ->                         redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocalCallback(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        address _to,
        uint256 _amountSD,
        uint256 _amountToMintSD
    ) external nonReentrant onlyRouter {
        if (_amountToMintSD > 0) {
            _mintLocal(_to, amountSDtoLD(_amountToMintSD), false, false);
        }
        ChainPath storage cp = getAndCheckCP(_srcChainId, _srcPoolId);
        cp.lkb = cp.lkb.sub(_amountSD);
        uint256 amountLD = amountSDtoLD(_amountSD);
        _safeTransfer(token, _to, amountLD);
        emit RedeemLocalCallback(_to, _amountSD, _amountToMintSD);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal(amount)   ->               redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocalCheckOnRemote(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        uint256 _amountSD
    ) external nonReentrant onlyRouter returns (uint256 swapAmount, uint256 mintAmount) {
        ChainPath storage cp = getAndCheckCP(_srcChainId, _srcPoolId);
        if (_amountSD > cp.balance) {
            mintAmount = _amountSD - cp.balance;
            swapAmount = cp.balance;
            cp.balance = 0;
        } else {
            cp.balance = cp.balance.sub(_amountSD);
            swapAmount = _amountSD;
            mintAmount = 0;
        }
        emit WithdrawRemote(_srcChainId, _srcPoolId, swapAmount, mintAmount);
    }
    //---------------------------------------------------------------------------
    // DAO Calls
    function createChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint256 _weight
    ) external onlyRouter {
        for (uint256 i = 0; i < chainPaths.length; ++i) {
            ChainPath memory cp = chainPaths[i];
            bool exists = cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId;
            require(!exists, "Stargate: cant createChainPath of existing dstChainId and _dstPoolId");
        }
        totalWeight = totalWeight.add(_weight);
        chainPathIndexLookup[_dstChainId][_dstPoolId] = chainPaths.length;
        chainPaths.push(ChainPath(false, _dstChainId, _dstPoolId, _weight, 0, 0, 0, 0));
        emit ChainPathUpdate(_dstChainId, _dstPoolId, _weight);
    }
    function setWeightForChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint16 _weight
    ) external onlyRouter {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        totalWeight = totalWeight.sub(cp.weight).add(_weight);
        cp.weight = _weight;
        emit ChainPathUpdate(_dstChainId, _dstPoolId, _weight);
    }
    function setFee(uint256 _mintFeeBP) external onlyRouter {
        require(_mintFeeBP <= BP_DENOMINATOR, "Bridge: cum fees > 100%");
        mintFeeBP = _mintFeeBP;
        emit FeesUpdated(mintFeeBP);
    }
    function setFeeLibrary(address _feeLibraryAddr) external onlyRouter {
        require(_feeLibraryAddr != address(0x0), "Stargate: fee library cant be 0x0");
        feeLibrary = _feeLibraryAddr;
        emit FeeLibraryUpdated(_feeLibraryAddr);
    }
    function setSwapStop(bool _swapStop) external onlyRouter {
        stopSwap = _swapStop;
        emit StopSwapUpdated(_swapStop);
    }
    function setDeltaParam(
        bool _batched,
        uint256 _swapDeltaBP,
        uint256 _lpDeltaBP,
        bool _defaultSwapMode,
        bool _defaultLPMode
    ) external onlyRouter {
        require(_swapDeltaBP <= BP_DENOMINATOR && _lpDeltaBP <= BP_DENOMINATOR, "Stargate: wrong Delta param");
        batched = _batched;
        swapDeltaBP = _swapDeltaBP;
        lpDeltaBP = _lpDeltaBP;
        defaultSwapMode = _defaultSwapMode;
        defaultLPMode = _defaultLPMode;
        emit DeltaParamUpdated(_batched, _swapDeltaBP, _lpDeltaBP, _defaultSwapMode, _defaultLPMode);
    }
    function callDelta(bool _fullMode) external onlyRouter {
        _delta(_fullMode);
    }
    function activateChainPath(uint16 _dstChainId, uint256 _dstPoolId) external onlyRouter {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == false, "Stargate: chainPath is already active");
        // this func will only be called once
        cp.ready = true;
    }
    function withdrawProtocolFeeBalance(address _to) external onlyRouter {
        if (protocolFeeBalance > 0) {
            uint256 amountOfLD = amountSDtoLD(protocolFeeBalance);
            protocolFeeBalance = 0;
            _safeTransfer(token, _to, amountOfLD);
            emit WithdrawProtocolFeeBalance(_to, amountOfLD);
        }
    }
    function withdrawMintFeeBalance(address _to) external onlyRouter {
        if (mintFeeBalance > 0) {
            uint256 amountOfLD = amountSDtoLD(mintFeeBalance);
            mintFeeBalance = 0;
            _safeTransfer(token, _to, amountOfLD);
            emit WithdrawMintFeeBalance(_to, amountOfLD);
        }
    }
    //---------------------------------------------------------------------------
    // INTERNAL
    // Conversion Helpers
    //---------------------------------------------------------------------------
    function amountLPtoLD(uint256 _amountLP) external view returns (uint256) {
        return amountSDtoLD(_amountLPtoSD(_amountLP));
    }
    function _amountLPtoSD(uint256 _amountLP) internal view returns (uint256) {
        require(totalSupply > 0, "Stargate: cant convert LPtoSD when totalSupply == 0");
        return _amountLP.mul(totalLiquidity).div(totalSupply);
    }
    function _amountSDtoLP(uint256 _amountSD) internal view returns (uint256) {
        require(totalLiquidity > 0, "Stargate: cant convert SDtoLP when totalLiq == 0");
        return _amountSD.mul(totalSupply).div(totalLiquidity);
    }
    function amountSDtoLD(uint256 _amount) internal view returns (uint256) {
        return _amount.mul(convertRate);
    }
    function amountLDtoSD(uint256 _amount) internal view returns (uint256) {
        return _amount.div(convertRate);
    }
    function getAndCheckCP(uint16 _dstChainId, uint256 _dstPoolId) internal view returns (ChainPath storage) {
        require(chainPaths.length > 0, "Stargate: no chainpaths exist");
        ChainPath storage cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        require(cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId, "Stargate: local chainPath does not exist");
        return cp;
    }
    function getChainPath(uint16 _dstChainId, uint256 _dstPoolId) external view returns (ChainPath memory) {
        ChainPath memory cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        require(cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId, "Stargate: local chainPath does not exist");
        return cp;
    }
    function _burnLocal(address _from, uint256 _amountLP) internal returns (uint256) {
        require(totalSupply > 0, "Stargate: cant burn when totalSupply == 0");
        uint256 amountOfLPTokens = balanceOf[_from];
        require(amountOfLPTokens >= _amountLP, "Stargate: not enough LP tokens to burn");
        uint256 amountSD = _amountLP.mul(totalLiquidity).div(totalSupply);
        //subtract totalLiquidity accordingly
        totalLiquidity = totalLiquidity.sub(amountSD);
        _burn(_from, _amountLP);
        emit Burn(_from, _amountLP, amountSD);
        return amountSD;
    }
    function _delta(bool fullMode) internal {
        if (deltaCredit > 0 && totalWeight > 0) {
            uint256 cpLength = chainPaths.length;
            uint256[] memory deficit = new uint256[](cpLength);
            uint256 totalDeficit = 0;
            // algorithm steps 6-9: calculate the total and the amounts required to get to balance state
            for (uint256 i = 0; i < cpLength; ++i) {
                ChainPath storage cp = chainPaths[i];
                // (liquidity * (weight/totalWeight)) - (lkb+credits)
                uint256 balLiq = totalLiquidity.mul(cp.weight).div(totalWeight);
                uint256 currLiq = cp.lkb.add(cp.credits);
                if (balLiq > currLiq) {
                    // save gas since we know balLiq > currLiq and we know deficit[i] > 0
                    deficit[i] = balLiq - currLiq;
                    totalDeficit = totalDeficit.add(deficit[i]);
                }
            }
            // indicates how much delta credit is distributed
            uint256 spent;
            // handle credits with 2 tranches. the [ < totalDeficit] [excessCredit]
            // run full Delta, allocate all credits
            if (totalDeficit == 0) {
                // only fullMode delta will allocate excess credits
                if (fullMode && deltaCredit > 0) {
                    // credit ChainPath by weights
                    for (uint256 i = 0; i < cpLength; ++i) {
                        ChainPath storage cp = chainPaths[i];
                        // credits = credits + toBalanceChange + remaining allocation based on weight
                        uint256 amtToCredit = deltaCredit.mul(cp.weight).div(totalWeight);
                        spent = spent.add(amtToCredit);
                        cp.credits = cp.credits.add(amtToCredit);
                    }
                } // else do nth
            } else if (totalDeficit <= deltaCredit) {
                if (fullMode) {
                    // algorithm step 13: calculate amount to disperse to bring to balance state or as close as possible
                    uint256 excessCredit = deltaCredit - totalDeficit;
                    // algorithm steps 14-16: calculate credits
                    for (uint256 i = 0; i < cpLength; ++i) {
                        if (deficit[i] > 0) {
                            ChainPath storage cp = chainPaths[i];
                            // credits = credits + deficit + remaining allocation based on weight
                            uint256 amtToCredit = deficit[i].add(excessCredit.mul(cp.weight).div(totalWeight));
                            spent = spent.add(amtToCredit);
                            cp.credits = cp.credits.add(amtToCredit);
                        }
                    }
                } else {
                    // totalDeficit <= deltaCredit but not running fullMode
                    // credit chainPaths as is if any deficit, not using all deltaCredit
                    for (uint256 i = 0; i < cpLength; ++i) {
                        if (deficit[i] > 0) {
                            ChainPath storage cp = chainPaths[i];
                            uint256 amtToCredit = deficit[i];
                            spent = spent.add(amtToCredit);
                            cp.credits = cp.credits.add(amtToCredit);
                        }
                    }
                }
            } else {
                // totalDeficit > deltaCredit, fullMode or not, normalize the deficit by deltaCredit
                for (uint256 i = 0; i < cpLength; ++i) {
                    if (deficit[i] > 0) {
                        ChainPath storage cp = chainPaths[i];
                        uint256 proportionalDeficit = deficit[i].mul(deltaCredit).div(totalDeficit);
                        spent = spent.add(proportionalDeficit);
                        cp.credits = cp.credits.add(proportionalDeficit);
                    }
                }
            }
            // deduct the amount of credit sent
            deltaCredit = deltaCredit.sub(spent);
        }
    }
    function _mintLocal(
        address _to,
        uint256 _amountLD,
        bool _feesEnabled,
        bool _creditDelta
    ) internal returns (uint256 amountSD) {
        require(totalWeight > 0, "Stargate: No ChainPaths exist");
        amountSD = amountLDtoSD(_amountLD);
        uint256 mintFeeSD = 0;
        if (_feesEnabled) {
            mintFeeSD = amountSD.mul(mintFeeBP).div(BP_DENOMINATOR);
            amountSD = amountSD.sub(mintFeeSD);
            mintFeeBalance = mintFeeBalance.add(mintFeeSD);
        }
        if (_creditDelta) {
            deltaCredit = deltaCredit.add(amountSD);
        }
        uint256 amountLPTokens = amountSD;
        if (totalSupply != 0) {
            amountLPTokens = amountSD.mul(totalSupply).div(totalLiquidity);
        }
        totalLiquidity = totalLiquidity.add(amountSD);
        _mint(_to, amountLPTokens);
        emit Mint(_to, amountLPTokens, amountSD, mintFeeSD);
        // add to credits and call delta. short circuit to save gas
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultLPMode);
        }
    }
    function _safeTransfer(
        address _token,
        address _to,
        uint256 _value
    ) private {
        (bool success, bytes memory data) = _token.call(abi.encodeWithSelector(SELECTOR, _to, _value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "Stargate: TRANSFER_FAILED");
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./Pool.sol";
contract Factory is Ownable {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // VARIABLES
    mapping(uint256 => Pool) public getPool; // poolId -> PoolInfo
    address[] public allPools;
    address public immutable router;
    address public defaultFeeLibrary; // address for retrieving fee params for swaps
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == router, "Stargate: caller must be Router.");
        _;
    }
    constructor(address _router) {
        require(_router != address(0x0), "Stargate: _router cant be 0x0"); // 1 time only
        router = _router;
    }
    function setDefaultFeeLibrary(address _defaultFeeLibrary) external onlyOwner {
        require(_defaultFeeLibrary != address(0x0), "Stargate: fee library cant be 0x0");
        defaultFeeLibrary = _defaultFeeLibrary;
    }
    function allPoolsLength() external view returns (uint256) {
        return allPools.length;
    }
    function createPool(
        uint256 _poolId,
        address _token,
        uint8 _sharedDecimals,
        uint8 _localDecimals,
        string memory _name,
        string memory _symbol
    ) public onlyRouter returns (address poolAddress) {
        require(address(getPool[_poolId]) == address(0x0), "Stargate: Pool already created");
        Pool pool = new Pool(_poolId, router, _token, _sharedDecimals, _localDecimals, defaultFeeLibrary, _name, _symbol);
        getPool[_poolId] = pool;
        poolAddress = address(pool);
        allPools.push(poolAddress);
    }
    function renounceOwnership() public override onlyOwner {}
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.7.6;
pragma abicoder v2;
interface IStargateLPStaking {
    function poolInfo(uint256 _poolIndex)
        external
        view
        returns (
            address,
            uint256,
            uint256,
            uint256
        );
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;
interface AggregatorV3Interface {
    function decimals() external view returns (uint8);
    function description() external view returns (string memory);
    function version() external view returns (uint256);
    // getRoundData and latestRoundData should both raise "No data present"
    // if they do not have data to report, instead of returning unset values
    // which could be misinterpreted as actual reported values.
    function getRoundData(uint80 _roundId)
    external
    view
    returns (
        uint80 roundId,
        int256 answer,
        uint256 startedAt,
        uint256 updatedAt,
        uint80 answeredInRound
    );
    function latestRoundData()
    external
    view
    returns (
        uint80 roundId,
        int256 answer,
        uint256 startedAt,
        uint256 updatedAt,
        uint80 answeredInRound
    );
}// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@layerzerolabs/layerzero-core/contracts/interfaces/ILayerZeroReceiver.sol";
import "@layerzerolabs/layerzero-core/contracts/interfaces/ILayerZeroEndpoint.sol";
import "@layerzerolabs/layerzero-core/contracts/interfaces/ILayerZeroUserApplicationConfig.sol";
/*
 * a generic LzReceiver implementation
 */
abstract contract LzApp is Ownable, ILayerZeroReceiver, ILayerZeroUserApplicationConfig {
    ILayerZeroEndpoint public immutable lzEndpoint;
    mapping(uint16 => bytes) public trustedRemoteLookup;
    mapping(uint16 => mapping(uint16 => uint)) public minDstGasLookup;
    address public precrime;
    event SetPrecrime(address precrime);
    event SetTrustedRemote(uint16 _remoteChainId, bytes _path);
    event SetTrustedRemoteAddress(uint16 _remoteChainId, bytes _remoteAddress);
    event SetMinDstGas(uint16 _dstChainId, uint16 _type, uint _minDstGas);
    constructor(address _endpoint) {
        lzEndpoint = ILayerZeroEndpoint(_endpoint);
    }
    function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) public virtual override {
        // lzReceive must be called by the endpoint for security
        require(_msgSender() == address(lzEndpoint), "LzApp: invalid endpoint caller");
        bytes memory trustedRemote = trustedRemoteLookup[_srcChainId];
        // if will still block the message pathway from (srcChainId, srcAddress). should not receive message from untrusted remote.
        require(_srcAddress.length == trustedRemote.length && trustedRemote.length > 0 && keccak256(_srcAddress) == keccak256(trustedRemote), "LzApp: invalid source sending contract");
        _blockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);
    }
    // abstract function - the default behaviour of LayerZero is blocking. See: NonblockingLzApp if you dont need to enforce ordered messaging
    function _blockingLzReceive(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload) internal virtual;
    function _lzSend(uint16 _dstChainId, bytes memory _payload, address payable _refundAddress, address _zroPaymentAddress, bytes memory _adapterParams, uint _nativeFee) internal virtual {
        bytes memory trustedRemote = trustedRemoteLookup[_dstChainId];
        require(trustedRemote.length != 0, "LzApp: destination chain is not a trusted source");
        lzEndpoint.send{value: _nativeFee}(_dstChainId, trustedRemote, _payload, _refundAddress, _zroPaymentAddress, _adapterParams);
    }
    function _checkGasLimit(uint16 _dstChainId, uint16 _type, bytes memory _adapterParams, uint _extraGas) internal view virtual {
        uint providedGasLimit = _getGasLimit(_adapterParams);
        uint minGasLimit = minDstGasLookup[_dstChainId][_type] + _extraGas;
        require(minGasLimit > 0, "LzApp: minGasLimit not set");
        require(providedGasLimit >= minGasLimit, "LzApp: gas limit is too low");
    }
    function _getGasLimit(bytes memory _adapterParams) internal pure virtual returns (uint gasLimit) {
        require(_adapterParams.length >= 34, "LzApp: invalid adapterParams");
        assembly {
            gasLimit := mload(add(_adapterParams, 34))
        }
    }
    //---------------------------UserApplication config----------------------------------------
    function getConfig(uint16 _version, uint16 _chainId, address, uint _configType) external view returns (bytes memory) {
        return lzEndpoint.getConfig(_version, _chainId, address(this), _configType);
    }
    // generic config for LayerZero user Application
    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external override onlyOwner {
        lzEndpoint.setConfig(_version, _chainId, _configType, _config);
    }
    function setSendVersion(uint16 _version) external override onlyOwner {
        lzEndpoint.setSendVersion(_version);
    }
    function setReceiveVersion(uint16 _version) external override onlyOwner {
        lzEndpoint.setReceiveVersion(_version);
    }
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external override onlyOwner {
        lzEndpoint.forceResumeReceive(_srcChainId, _srcAddress);
    }
    // _path = abi.encodePacked(remoteAddress, localAddress)
    // this function set the trusted path for the cross-chain communication
    function setTrustedRemote(uint16 _srcChainId, bytes calldata _path) external onlyOwner {
        trustedRemoteLookup[_srcChainId] = _path;
        emit SetTrustedRemote(_srcChainId, _path);
    }
    function setPrecrime(address _precrime) external onlyOwner {
        precrime = _precrime;
        emit SetPrecrime(_precrime);
    }
    function setMinDstGas(uint16 _dstChainId, uint16 _packetType, uint _minGas) external onlyOwner {
        require(_minGas > 0, "LzApp: invalid minGas");
        minDstGasLookup[_dstChainId][_packetType] = _minGas;
        emit SetMinDstGas(_dstChainId, _packetType, _minGas);
    }
    //--------------------------- VIEW FUNCTION ----------------------------------------
    function isTrustedRemote(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool) {
        bytes memory trustedSource = trustedRemoteLookup[_srcChainId];
        return keccak256(trustedSource) == keccak256(_srcAddress);
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
// imports
import "@openzeppelin/contracts/utils/EnumerableSet.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./StargateToken.sol";
// interfaces
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
contract LPStaking is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    // Info of each user.
    struct UserInfo {
        uint256 amount; // How many LP tokens the user has provided.
        uint256 rewardDebt; // Reward debt. See explanation below.
        //
        // We do some fancy math here. Basically, any point in time, the amount of STGs
        // entitled to a user but is pending to be distributed is:
        //
        //   pending reward = (user.amount * pool.accStargatePerShare) - user.rewardDebt
        //
        // Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:
        //   1. The pool's `accStargatePerShare` (and `lastRewardBlock`) gets updated.
        //   2. User receives the pending reward sent to his/her address.
        //   3. User's `amount` gets updated.
        //   4. User's `rewardDebt` gets updated.
    }
    // Info of each pool.
    struct PoolInfo {
        IERC20 lpToken; // Address of LP token contract.
        uint256 allocPoint; // How many allocation points assigned to this pool. STGs to distribute per block.
        uint256 lastRewardBlock; // Last block number that STGs distribution occurs.
        uint256 accStargatePerShare; // Accumulated STGs per share, times 1e12. See below.
    }
    // The STG TOKEN!
    StargateToken public stargate;
    // Block number when bonus STG period ends.
    uint256 public bonusEndBlock;
    // STG tokens created per block.
    uint256 public stargatePerBlock;
    // Bonus multiplier for early stargate makers.
    uint256 public constant BONUS_MULTIPLIER = 1;
    // Track which tokens have been added.
    mapping(address => bool) private addedLPTokens;
    mapping(uint256 => uint256) public lpBalances;
    // Info of each pool.
    PoolInfo[] public poolInfo;
    // Info of each user that stakes LP tokens.
    mapping(uint256 => mapping(address => UserInfo)) public userInfo;
    // Total allocation points. Must be the sum of all allocation points in all pools.
    uint256 public totalAllocPoint = 0;
    // The block number when STG mining starts.
    uint256 public startBlock;
    event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);
    constructor(
        StargateToken _stargate,
        uint256 _stargatePerBlock,
        uint256 _startBlock,
        uint256 _bonusEndBlock
    ) {
        require(_startBlock >= block.number, "LPStaking: _startBlock must be >= current block");
        require(_bonusEndBlock >= _startBlock, "LPStaking: _bonusEndBlock must be > than _startBlock");
        require(address(_stargate) != address(0x0), "Stargate: _stargate cannot be 0x0");
        stargate = _stargate;
        stargatePerBlock = _stargatePerBlock;
        startBlock = _startBlock;
        bonusEndBlock = _bonusEndBlock;
    }
    function poolLength() external view returns (uint256) {
        return poolInfo.length;
    }
    /// @notice handles adding a new LP token (Can only be called by the owner)
    /// @param _allocPoint The alloc point is used as the weight of the pool against all other alloc points added.
    /// @param _lpToken The lp token address
    function add(uint256 _allocPoint, IERC20 _lpToken) public onlyOwner {
        massUpdatePools();
        require(address(_lpToken) != address(0x0), "StarGate: lpToken cant be 0x0");
        require(addedLPTokens[address(_lpToken)] == false, "StarGate: _lpToken already exists");
        addedLPTokens[address(_lpToken)] = true;
        uint256 lastRewardBlock = block.number > startBlock ? block.number : startBlock;
        totalAllocPoint = totalAllocPoint.add(_allocPoint);
        poolInfo.push(PoolInfo({lpToken: _lpToken, allocPoint: _allocPoint, lastRewardBlock: lastRewardBlock, accStargatePerShare: 0}));
    }
    function set(uint256 _pid, uint256 _allocPoint) public onlyOwner {
        massUpdatePools();
        totalAllocPoint = totalAllocPoint.sub(poolInfo[_pid].allocPoint).add(_allocPoint);
        poolInfo[_pid].allocPoint = _allocPoint;
    }
    function getMultiplier(uint256 _from, uint256 _to) public view returns (uint256) {
        if (_to <= bonusEndBlock) {
            return _to.sub(_from).mul(BONUS_MULTIPLIER);
        } else if (_from >= bonusEndBlock) {
            return _to.sub(_from);
        } else {
            return bonusEndBlock.sub(_from).mul(BONUS_MULTIPLIER).add(_to.sub(bonusEndBlock));
        }
    }
    function pendingStargate(uint256 _pid, address _user) external view returns (uint256) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 accStargatePerShare = pool.accStargatePerShare;
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));
        if (block.number > pool.lastRewardBlock && lpSupply != 0) {
            uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
            uint256 stargateReward = multiplier.mul(stargatePerBlock).mul(pool.allocPoint).div(totalAllocPoint);
            accStargatePerShare = accStargatePerShare.add(stargateReward.mul(1e12).div(lpSupply));
        }
        return user.amount.mul(accStargatePerShare).div(1e12).sub(user.rewardDebt);
    }
    function massUpdatePools() public {
        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            updatePool(pid);
        }
    }
    function updatePool(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        if (block.number <= pool.lastRewardBlock) {
            return;
        }
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));
        if (lpSupply == 0) {
            pool.lastRewardBlock = block.number;
            return;
        }
        uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
        uint256 stargateReward = multiplier.mul(stargatePerBlock).mul(pool.allocPoint).div(totalAllocPoint);
        pool.accStargatePerShare = pool.accStargatePerShare.add(stargateReward.mul(1e12).div(lpSupply));
        pool.lastRewardBlock = block.number;
    }
    function deposit(uint256 _pid, uint256 _amount) public {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        updatePool(_pid);
        if (user.amount > 0) {
            uint256 pending = user.amount.mul(pool.accStargatePerShare).div(1e12).sub(user.rewardDebt);
            safeStargateTransfer(msg.sender, pending);
        }
        pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
        user.amount = user.amount.add(_amount);
        user.rewardDebt = user.amount.mul(pool.accStargatePerShare).div(1e12);
        lpBalances[_pid] = lpBalances[_pid].add(_amount);
        emit Deposit(msg.sender, _pid, _amount);
    }
    function withdraw(uint256 _pid, uint256 _amount) public {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        require(user.amount >= _amount, "withdraw: _amount is too large");
        updatePool(_pid);
        uint256 pending = user.amount.mul(pool.accStargatePerShare).div(1e12).sub(user.rewardDebt);
        safeStargateTransfer(msg.sender, pending);
        user.amount = user.amount.sub(_amount);
        user.rewardDebt = user.amount.mul(pool.accStargatePerShare).div(1e12);
        pool.lpToken.safeTransfer(address(msg.sender), _amount);
        lpBalances[_pid] = lpBalances[_pid].sub(_amount);
        emit Withdraw(msg.sender, _pid, _amount);
    }
    /// @notice Withdraw without caring about rewards.
    /// @param _pid The pid specifies the pool
    function emergencyWithdraw(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        uint256 userAmount = user.amount;
        user.amount = 0;
        user.rewardDebt = 0;
        pool.lpToken.safeTransfer(address(msg.sender), userAmount);
        lpBalances[_pid] = lpBalances[_pid].sub(userAmount);
        emit EmergencyWithdraw(msg.sender, _pid, userAmount);
    }
    /// @notice Safe transfer function, just in case if rounding error causes pool to not have enough STGs.
    /// @param _to The address to transfer tokens to
    /// @param _amount The quantity to transfer
    function safeStargateTransfer(address _to, uint256 _amount) internal {
        uint256 stargateBal = stargate.balanceOf(address(this));
        if (_amount > stargateBal) {
            IERC20(stargate).safeTransfer(_to, stargateBal);
        } else {
            IERC20(stargate).safeTransfer(_to, _amount);
        }
    }
    function setStargatePerBlock(uint256 _stargatePerBlock) external onlyOwner {
        massUpdatePools();
        stargatePerBlock = _stargatePerBlock;
    }
    // Override the renounce ownership inherited by zeppelin ownable
    function renounceOwnership() public override onlyOwner {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.
    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];
        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.
            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;
            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.
            bytes32 lastvalue = set._values[lastIndex];
            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based
            // Delete the slot where the moved value was stored
            set._values.pop();
            // Delete the index for the deleted slot
            delete set._indexes[value];
            return true;
        } else {
            return false;
        }
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }
    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }
   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }
    // Bytes32Set
    struct Bytes32Set {
        Set _inner;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }
    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }
    // AddressSet
    struct AddressSet {
        Set _inner;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }
    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }
    // UintSet
    struct UintSet {
        Set _inner;
    }
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }
    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
import "./OmnichainFungibleToken.sol";
contract StargateToken is OmnichainFungibleToken {
    constructor(
        string memory _name,
        string memory _symbol,
        address _endpoint,
        uint16 _mainEndpointId,
        uint256 _initialSupplyOnMainEndpoint
    ) OmnichainFungibleToken(_name, _symbol, _endpoint, _mainEndpointId, _initialSupplyOnMainEndpoint) {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";
/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }
    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.
        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@layerzerolabs/contracts/contracts/interfaces/ILayerZeroEndpoint.sol";
import "@layerzerolabs/contracts/contracts/interfaces/ILayerZeroReceiver.sol";
import "@layerzerolabs/contracts/contracts/interfaces/ILayerZeroUserApplicationConfig.sol";
contract OmnichainFungibleToken is ERC20, Ownable, ILayerZeroReceiver, ILayerZeroUserApplicationConfig {
    // the only endpointId these tokens will ever be minted on
    // required: the LayerZero endpoint which is passed in the constructor
    ILayerZeroEndpoint immutable public endpoint;
    // a map of our connected contracts
    mapping(uint16 => bytes) public dstContractLookup;
    // pause the sendTokens()
    bool public paused;
    bool public isMain;
    event Paused(bool isPaused);
    event SendToChain(uint16 dstChainId, bytes to, uint256 qty);
    event ReceiveFromChain(uint16 srcChainId, uint64 nonce, uint256 qty);
    constructor(
        string memory _name,
        string memory _symbol,
        address _endpoint,
        uint16 _mainChainId,
        uint256 initialSupplyOnMainEndpoint
    ) ERC20(_name, _symbol) {
        if (ILayerZeroEndpoint(_endpoint).getChainId() == _mainChainId) {
            _mint(msg.sender, initialSupplyOnMainEndpoint);
            isMain = true;
        }
        // set the LayerZero endpoint
        endpoint = ILayerZeroEndpoint(_endpoint);
    }
    function pauseSendTokens(bool _pause) external onlyOwner {
        paused = _pause;
        emit Paused(_pause);
    }
    function setDestination(uint16 _dstChainId, bytes calldata _destinationContractAddress) public onlyOwner {
        dstContractLookup[_dstChainId] = _destinationContractAddress;
    }
    function chainId() external view returns (uint16){
        return endpoint.getChainId();
    }
    function sendTokens(
        uint16 _dstChainId, // send tokens to this chainId
        bytes calldata _to, // where to deliver the tokens on the destination chain
        uint256 _qty, // how many tokens to send
        address zroPaymentAddress, // ZRO payment address
        bytes calldata adapterParam // txParameters
    ) public payable {
        require(!paused, "OFT: sendTokens() is currently paused");
        // lock if leaving the safe chain, otherwise burn
        if (isMain) {
            // ... transferFrom the tokens to this contract for locking purposes
            _transfer(msg.sender, address(this), _qty);
        } else {
            _burn(msg.sender, _qty);
        }
        // abi.encode() the payload with the values to send
        bytes memory payload = abi.encode(_to, _qty);
        // send LayerZero message
        endpoint.send{value: msg.value}(
            _dstChainId, // destination chainId
            dstContractLookup[_dstChainId], // destination UA address
            payload, // abi.encode()'ed bytes
            msg.sender, // refund address (LayerZero will refund any extra gas back to caller of send()
            zroPaymentAddress, // 'zroPaymentAddress' unused for this mock/example
            adapterParam // 'adapterParameters' unused for this mock/example
        );
        emit SendToChain(_dstChainId, _to, _qty);
    }
    function lzReceive(
        uint16 _srcChainId,
        bytes memory _fromAddress,
        uint64 nonce,
        bytes memory _payload
    ) external override {
        require(msg.sender == address(endpoint)); // boilerplate! lzReceive must be called by the endpoint for security
        require(
            _fromAddress.length == dstContractLookup[_srcChainId].length && keccak256(_fromAddress) == keccak256(dstContractLookup[_srcChainId]),
            "OFT: invalid source sending contract"
        );
        // decode
        (bytes memory _to, uint256 _qty) = abi.decode(_payload, (bytes, uint256));
        address toAddress;
        // load the toAddress from the bytes
        assembly {
            toAddress := mload(add(_to, 20))
        }
        // mint the tokens back into existence, to the receiving address
        if (isMain) {
            _transfer(address(this), toAddress, _qty);
        } else {
            _mint(toAddress, _qty);
        }
        emit ReceiveFromChain(_srcChainId, nonce, _qty);
    }
    function estimateSendTokensFee(uint16 _dstChainId, bool _useZro, bytes calldata txParameters) external view returns (uint256 nativeFee, uint256 zroFee) {
        return endpoint.estimateFees(_dstChainId, address(this), bytes(""), _useZro, txParameters);
    }
    //---------------------------DAO CALL----------------------------------------
    // generic config for user Application
    function setConfig(
        uint16 _version,
        uint16 _chainId,
        uint256 _configType,
        bytes calldata _config
    ) external override onlyOwner {
        endpoint.setConfig(_version, _chainId, _configType, _config);
    }
    function setSendVersion(uint16 version) external override onlyOwner {
        endpoint.setSendVersion(version);
    }
    function setReceiveVersion(uint16 version) external override onlyOwner {
        endpoint.setReceiveVersion(version);
    }
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external override onlyOwner {
        endpoint.forceResumeReceive(_srcChainId, _srcAddress);
    }
    function renounceOwnership() public override onlyOwner {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../../utils/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";
/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    uint256 private _totalSupply;
    string private _name;
    string private _symbol;
    uint8 private _decimals;
    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }
    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }
    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }
    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }
    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }
    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }
    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }
    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }
    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        _beforeTokenTransfer(sender, recipient, amount);
        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }
    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address(0), account, amount);
        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }
    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");
        _beforeTokenTransfer(account, address(0), amount);
        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }
    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }
    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
import "./ILayerZeroUserApplicationConfig.sol";
interface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {
    // @notice send a LayerZero message to the specified address at a LayerZero endpoint.
    // @param _dstChainId - the destination chain identifier
    // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains
    // @param _payload - a custom bytes payload to send to the destination contract
    // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address
    // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction
    // @param _adapterParams - parameters for custom functionality. ie: pay for a specified destination gasAmount, or receive airdropped native gas from the relayer on destination
    function send(uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;
    // @notice used by the messaging library to publish verified payload
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source contract (as bytes) at the source chain
    // @param _dstAddress - the address on destination chain
    // @param _nonce - the unbound message ordering nonce
    // @param _gasLimit - the gas limit for external contract execution
    // @param _payload - verified payload to send to the destination contract
    function receivePayload(uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload) external;
    // @notice get the inboundNonce of a receiver from a source chain which could be EVM or non-EVM chain
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64);
    // @notice get the outboundNonce from this source chain which, consequently, is always an EVM
    // @param _srcAddress - the source chain contract address
    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64);
    // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery
    // @param _dstChainId - the destination chain identifier
    // @param _userApplication - the user app address on this EVM chain
    // @param _payload - the custom message to send over LayerZero
    // @param _payInZRO - if false, user app pays the protocol fee in native token
    // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain
    function estimateFees(uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);
    // @notice get this Endpoint's immutable source identifier
    function getChainId() external view returns (uint16);
    // @notice the interface to retry failed message on this Endpoint destination
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    // @param _payload - the payload to be retried
    function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external;
    // @notice query if any STORED payload (message blocking) at the endpoint.
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool);
    // @notice query if the _libraryAddress is valid for sending msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getSendLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the _libraryAddress is valid for receiving msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getReceiveLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the non-reentrancy guard for send() is on
    // @return true if the guard is on. false otherwise
    function isSendingPayload() external view returns (bool);
    // @notice query if the non-reentrancy guard for receive() is on
    // @return true if the guard is on. false otherwise
    function isReceivingPayload() external view returns (bool);
    // @notice get the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _userApplication - the contract address of the user application
    // @param _configType - type of configuration. every messaging library has its own convention.
    function getConfig(uint16 _version, uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);
    // @notice get the send() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getSendVersion(address _userApplication) external view returns (uint16);
    // @notice get the lzReceive() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getReceiveVersion(address _userApplication) external view returns (uint16);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroReceiver {
    // @notice LayerZero endpoint will invoke this function to deliver the message on the destination
    // @param _srcChainId - the source endpoint identifier
    // @param _srcAddress - the source sending contract address from the source chain
    // @param _nonce - the ordered message nonce
    // @param _payload - the signed payload is the UA bytes has encoded to be sent
    function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) external;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroUserApplicationConfig {
    // @notice set the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _configType - type of configuration. every messaging library has its own convention.
    // @param _config - configuration in the bytes. can encode arbitrary content.
    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external;
    // @notice set the send() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setSendVersion(uint16 _version) external;
    // @notice set the lzReceive() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setReceiveVersion(uint16 _version) external;
    // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload
    // @param _srcChainId - the chainId of the source chain
    // @param _srcAddress - the contract address of the source contract at the source chain
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
// imports
import "@openzeppelin/contracts/access/Ownable.sol";
import "./Pool.sol";
import "./Router.sol";
// interfaces
import "@layerzerolabs/contracts/contracts/interfaces/ILayerZeroReceiver.sol";
import "@layerzerolabs/contracts/contracts/interfaces/ILayerZeroEndpoint.sol";
import "@layerzerolabs/contracts/contracts/interfaces/ILayerZeroUserApplicationConfig.sol";
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
contract Bridge is Ownable, ILayerZeroReceiver, ILayerZeroUserApplicationConfig {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    uint8 internal constant TYPE_SWAP_REMOTE = 1;
    uint8 internal constant TYPE_ADD_LIQUIDITY = 2;
    uint8 internal constant TYPE_REDEEM_LOCAL_CALL_BACK = 3;
    uint8 internal constant TYPE_WITHDRAW_REMOTE = 4;
    //---------------------------------------------------------------------------
    // VARIABLES
    ILayerZeroEndpoint public immutable layerZeroEndpoint;
    mapping(uint16 => bytes) public bridgeLookup;
    mapping(uint16 => mapping(uint8 => uint256)) public gasLookup;
    Router public immutable router;
    bool public useLayerZeroToken;
    //---------------------------------------------------------------------------
    // EVENTS
    event SendMsg(uint8 msgType, uint64 nonce);
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == address(router), "Stargate: caller must be Router.");
        _;
    }
    constructor(address _layerZeroEndpoint, address _router) {
        require(_layerZeroEndpoint != address(0x0), "Stargate: _layerZeroEndpoint cannot be 0x0");
        require(_router != address(0x0), "Stargate: _router cannot be 0x0");
        layerZeroEndpoint = ILayerZeroEndpoint(_layerZeroEndpoint);
        router = Router(_router);
    }
    //---------------------------------------------------------------------------
    // EXTERNAL functions
    function lzReceive(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload
    ) external override {
        require(msg.sender == address(layerZeroEndpoint), "Stargate: only LayerZero endpoint can call lzReceive");
        require(
            _srcAddress.length == bridgeLookup[_srcChainId].length && keccak256(_srcAddress) == keccak256(bridgeLookup[_srcChainId]),
            "Stargate: bridge does not match"
        );
        uint8 functionType;
        assembly {
            functionType := mload(add(_payload, 32))
        }
        if (functionType == TYPE_SWAP_REMOTE) {
            (
                ,
                uint256 srcPoolId,
                uint256 dstPoolId,
                uint256 dstGasForCall,
                Pool.CreditObj memory c,
                Pool.SwapObj memory s,
                bytes memory to,
                bytes memory payload
            ) = abi.decode(_payload, (uint8, uint256, uint256, uint256, Pool.CreditObj, Pool.SwapObj, bytes, bytes));
            address toAddress;
            assembly {
                toAddress := mload(add(to, 20))
            }
            router.creditChainPath(_srcChainId, srcPoolId, dstPoolId, c);
            router.swapRemote(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, dstGasForCall, toAddress, s, payload);
        } else if (functionType == TYPE_ADD_LIQUIDITY) {
            (, uint256 srcPoolId, uint256 dstPoolId, Pool.CreditObj memory c) = abi.decode(_payload, (uint8, uint256, uint256, Pool.CreditObj));
            router.creditChainPath(_srcChainId, srcPoolId, dstPoolId, c);
        } else if (functionType == TYPE_REDEEM_LOCAL_CALL_BACK) {
            (, uint256 srcPoolId, uint256 dstPoolId, Pool.CreditObj memory c, uint256 amountSD, uint256 mintAmountSD, bytes memory to) = abi
                .decode(_payload, (uint8, uint256, uint256, Pool.CreditObj, uint256, uint256, bytes));
            address toAddress;
            assembly {
                toAddress := mload(add(to, 20))
            }
            router.creditChainPath(_srcChainId, srcPoolId, dstPoolId, c);
            router.redeemLocalCallback(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, toAddress, amountSD, mintAmountSD);
        } else if (functionType == TYPE_WITHDRAW_REMOTE) {
            (, uint256 srcPoolId, uint256 dstPoolId, Pool.CreditObj memory c, uint256 amountSD, bytes memory to) = abi.decode(
                _payload,
                (uint8, uint256, uint256, Pool.CreditObj, uint256, bytes)
            );
            router.creditChainPath(_srcChainId, srcPoolId, dstPoolId, c);
            router.redeemLocalCheckOnRemote(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, amountSD, to);
        }
    }
    //---------------------------------------------------------------------------
    // LOCAL CHAIN FUNCTIONS
    function swap(
        uint16 _chainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        Pool.CreditObj memory _c,
        Pool.SwapObj memory _s,
        IStargateRouter.lzTxObj memory _lzTxParams,
        bytes calldata _to,
        bytes calldata _payload
    ) external payable onlyRouter {
        bytes memory payload = abi.encode(TYPE_SWAP_REMOTE, _srcPoolId, _dstPoolId, _lzTxParams.dstGasForCall, _c, _s, _to, _payload);
        _call(_chainId, TYPE_SWAP_REMOTE, _refundAddress, _lzTxParams, payload);
    }
    function redeemLocalCallback(
        uint16 _chainId,
        address payable _refundAddress,
        Pool.CreditObj memory _c,
        IStargateRouter.lzTxObj memory _lzTxParams,
        bytes memory _payload
    ) external payable onlyRouter {
        bytes memory payload;
        {
            (, uint256 srcPoolId, uint256 dstPoolId, uint256 amountSD, uint256 mintAmountSD, bytes memory to) = abi.decode(
                _payload,
                (uint8, uint256, uint256, uint256, uint256, bytes)
            );
            // swap dst and src because we are headed back
            payload = abi.encode(TYPE_REDEEM_LOCAL_CALL_BACK, dstPoolId, srcPoolId, _c, amountSD, mintAmountSD, to);
        }
        _call(_chainId, TYPE_REDEEM_LOCAL_CALL_BACK, _refundAddress, _lzTxParams, payload);
    }
    function redeemLocal(
        uint16 _chainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        Pool.CreditObj memory _c,
        uint256 _amountSD,
        bytes calldata _to,
        IStargateRouter.lzTxObj memory _lzTxParams
    ) external payable onlyRouter {
        bytes memory payload = abi.encode(TYPE_WITHDRAW_REMOTE, _srcPoolId, _dstPoolId, _c, _amountSD, _to);
        _call(_chainId, TYPE_WITHDRAW_REMOTE, _refundAddress, _lzTxParams, payload);
    }
    function sendCredits(
        uint16 _chainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        Pool.CreditObj memory _c
    ) external payable onlyRouter {
        bytes memory payload = abi.encode(TYPE_ADD_LIQUIDITY, _srcPoolId, _dstPoolId, _c);
        IStargateRouter.lzTxObj memory lzTxObj = IStargateRouter.lzTxObj(0, 0, "0x");
        _call(_chainId, TYPE_ADD_LIQUIDITY, _refundAddress, lzTxObj, payload);
    }
    function quoteLayerZeroFee(
        uint16 _chainId,
        uint8 _functionType,
        bytes calldata _toAddress,
        bytes calldata _transferAndCallPayload,
        IStargateRouter.lzTxObj memory _lzTxParams
    ) external view returns (uint256, uint256) {
        bytes memory payload = "";
        Pool.CreditObj memory c = Pool.CreditObj(1, 1);
        if (_functionType == TYPE_SWAP_REMOTE) {
            Pool.SwapObj memory s = Pool.SwapObj(1, 1, 1, 1, 1, 1);
            payload = abi.encode(TYPE_SWAP_REMOTE, 0, 0, 0, c, s, _toAddress, _transferAndCallPayload);
        } else if (_functionType == TYPE_ADD_LIQUIDITY) {
            payload = abi.encode(TYPE_ADD_LIQUIDITY, 0, 0, c);
        } else if (_functionType == TYPE_REDEEM_LOCAL_CALL_BACK) {
            payload = abi.encode(TYPE_REDEEM_LOCAL_CALL_BACK, 0, 0, c, 0, 0, _toAddress);
        } else if (_functionType == TYPE_WITHDRAW_REMOTE) {
            payload = abi.encode(TYPE_WITHDRAW_REMOTE, 0, 0, c, 0, _toAddress);
        } else {
            revert("Stargate: unsupported function type");
        }
        bytes memory lzTxParamBuilt = _txParamBuilder(_chainId, _functionType, _lzTxParams);
        return layerZeroEndpoint.estimateFees(_chainId, address(this), payload, useLayerZeroToken, lzTxParamBuilt);
    }
    //---------------------------------------------------------------------------
    // dao functions
    function setBridge(uint16 _chainId, bytes calldata _bridgeAddress) external onlyOwner {
        require(bridgeLookup[_chainId].length == 0, "Stargate: Bridge already set!");
        bridgeLookup[_chainId] = _bridgeAddress;
    }
    function setGasAmount(
        uint16 _chainId,
        uint8 _functionType,
        uint256 _gasAmount
    ) external onlyOwner {
        require(_functionType >= 1 && _functionType <= 4, "Stargate: invalid _functionType");
        gasLookup[_chainId][_functionType] = _gasAmount;
    }
    function approveTokenSpender(
        address token,
        address spender,
        uint256 amount
    ) external onlyOwner {
        IERC20(token).approve(spender, amount);
    }
    function setUseLayerZeroToken(bool enable) external onlyOwner {
        useLayerZeroToken = enable;
    }
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external override onlyOwner {
        layerZeroEndpoint.forceResumeReceive(_srcChainId, _srcAddress);
    }
    //---------------------------------------------------------------------------
    // generic config for user Application
    function setConfig(
        uint16 _version,
        uint16 _chainId,
        uint256 _configType,
        bytes calldata _config
    ) external override onlyOwner {
        layerZeroEndpoint.setConfig(_version, _chainId, _configType, _config);
    }
    function setSendVersion(uint16 version) external override onlyOwner {
        layerZeroEndpoint.setSendVersion(version);
    }
    function setReceiveVersion(uint16 version) external override onlyOwner {
        layerZeroEndpoint.setReceiveVersion(version);
    }
    //---------------------------------------------------------------------------
    // INTERNAL functions
    function txParamBuilderType1(uint256 _gasAmount) internal pure returns (bytes memory) {
        uint16 txType = 1;
        return abi.encodePacked(txType, _gasAmount);
    }
    function txParamBuilderType2(
        uint256 _gasAmount,
        uint256 _dstNativeAmount,
        bytes memory _dstNativeAddr
    ) internal pure returns (bytes memory) {
        uint16 txType = 2;
        return abi.encodePacked(txType, _gasAmount, _dstNativeAmount, _dstNativeAddr);
    }
    function _txParamBuilder(
        uint16 _chainId,
        uint8 _type,
        IStargateRouter.lzTxObj memory _lzTxParams
    ) internal view returns (bytes memory) {
        bytes memory lzTxParam;
        address dstNativeAddr;
        {
            bytes memory dstNativeAddrBytes = _lzTxParams.dstNativeAddr;
            assembly {
                dstNativeAddr := mload(add(dstNativeAddrBytes, 20))
            }
        }
        uint256 totalGas = gasLookup[_chainId][_type].add(_lzTxParams.dstGasForCall);
        if (_lzTxParams.dstNativeAmount > 0 && dstNativeAddr != address(0x0)) {
            lzTxParam = txParamBuilderType2(totalGas, _lzTxParams.dstNativeAmount, _lzTxParams.dstNativeAddr);
        } else {
            lzTxParam = txParamBuilderType1(totalGas);
        }
        return lzTxParam;
    }
    function _call(
        uint16 _chainId,
        uint8 _type,
        address payable _refundAddress,
        IStargateRouter.lzTxObj memory _lzTxParams,
        bytes memory _payload
    ) internal {
        bytes memory lzTxParamBuilt = _txParamBuilder(_chainId, _type, _lzTxParams);
        uint64 nextNonce = layerZeroEndpoint.getOutboundNonce(_chainId, address(this)) + 1;
        layerZeroEndpoint.send{value: msg.value}(_chainId, bridgeLookup[_chainId], _payload, _refundAddress, address(this), lzTxParamBuilt);
        emit SendMsg(_type, nextNonce);
    }
    function renounceOwnership() public override onlyOwner {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
// imports
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./LPTokenERC20.sol";
import "./interfaces/IStargateFeeLibrary.sol";
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
/// Pool contracts on other chains and managed by the Stargate protocol.
contract Pool is LPTokenERC20, ReentrancyGuard {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)")));
    uint256 public constant BP_DENOMINATOR = 10000;
    //---------------------------------------------------------------------------
    // STRUCTS
    struct ChainPath {
        bool ready; // indicate if the counter chainPath has been created.
        uint16 dstChainId;
        uint256 dstPoolId;
        uint256 weight;
        uint256 balance;
        uint256 lkb;
        uint256 credits;
        uint256 idealBalance;
    }
    struct SwapObj {
        uint256 amount;
        uint256 eqFee;
        uint256 eqReward;
        uint256 lpFee;
        uint256 protocolFee;
        uint256 lkbRemove;
    }
    struct CreditObj {
        uint256 credits;
        uint256 idealBalance;
    }
    //---------------------------------------------------------------------------
    // VARIABLES
    // chainPath
    ChainPath[] public chainPaths; // list of connected chains with shared pools
    mapping(uint16 => mapping(uint256 => uint256)) public chainPathIndexLookup; // lookup for chainPath by chainId => poolId =>index
    // metadata
    uint256 public immutable poolId; // shared id between chains to represent same pool
    uint256 public sharedDecimals; // the shared decimals (lowest common decimals between chains)
    uint256 public localDecimals; // the decimals for the token
    uint256 public immutable convertRate; // the decimals for the token
    address public immutable token; // the token for the pool
    address public immutable router; // the token for the pool
    bool public stopSwap; // flag to stop swapping in extreme cases
    // Fee and Liquidity
    uint256 public totalLiquidity; // the total amount of tokens added on this side of the chain (fees + deposits - withdrawals)
    uint256 public totalWeight; // total weight for pool percentages
    uint256 public mintFeeBP; // fee basis points for the mint/deposit
    uint256 public protocolFeeBalance; // fee balance created from dao fee
    uint256 public mintFeeBalance; // fee balance created from mint fee
    uint256 public eqFeePool; // pool rewards in Shared Decimal format. indicate the total budget for reverse swap incentive
    address public feeLibrary; // address for retrieving fee params for swaps
    // Delta related
    uint256 public deltaCredit; // credits accumulated from txn
    bool public batched; // flag to indicate if we want batch processing.
    bool public defaultSwapMode; // flag for the default mode for swap
    bool public defaultLPMode; // flag for the default mode for lp
    uint256 public swapDeltaBP; // basis points of poolCredits to activate Delta in swap
    uint256 public lpDeltaBP; // basis points of poolCredits to activate Delta in liquidity events
    //---------------------------------------------------------------------------
    // EVENTS
    event Mint(address to, uint256 amountLP, uint256 amountSD, uint256 mintFeeAmountSD);
    event Burn(address from, uint256 amountLP, uint256 amountSD);
    event RedeemLocalCallback(address _to, uint256 _amountSD, uint256 _amountToMintSD);
    event Swap(
        uint16 chainId,
        uint256 dstPoolId,
        address from,
        uint256 amountSD,
        uint256 eqReward,
        uint256 eqFee,
        uint256 protocolFee,
        uint256 lpFee
    );
    event SendCredits(uint16 dstChainId, uint256 dstPoolId, uint256 credits, uint256 idealBalance);
    event RedeemRemote(uint16 chainId, uint256 dstPoolId, address from, uint256 amountLP, uint256 amountSD);
    event RedeemLocal(address from, uint256 amountLP, uint256 amountSD, uint16 chainId, uint256 dstPoolId, bytes to);
    event InstantRedeemLocal(address from, uint256 amountLP, uint256 amountSD, address to);
    event CreditChainPath(uint16 chainId, uint256 srcPoolId, uint256 amountSD, uint256 idealBalance);
    event SwapRemote(address to, uint256 amountSD, uint256 protocolFee, uint256 dstFee);
    event WithdrawRemote(uint16 srcChainId, uint256 srcPoolId, uint256 swapAmount, uint256 mintAmount);
    event ChainPathUpdate(uint16 dstChainId, uint256 dstPoolId, uint256 weight);
    event FeesUpdated(uint256 mintFeeBP);
    event FeeLibraryUpdated(address feeLibraryAddr);
    event StopSwapUpdated(bool swapStop);
    event WithdrawProtocolFeeBalance(address to, uint256 amountSD);
    event WithdrawMintFeeBalance(address to, uint256 amountSD);
    event DeltaParamUpdated(bool batched, uint256 swapDeltaBP, uint256 lpDeltaBP, bool defaultSwapMode, bool defaultLPMode);
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == router, "Stargate: only the router can call this method");
        _;
    }
    constructor(
        uint256 _poolId,
        address _router,
        address _token,
        uint256 _sharedDecimals,
        uint256 _localDecimals,
        address _feeLibrary,
        string memory _name,
        string memory _symbol
    ) LPTokenERC20(_name, _symbol) {
        require(_token != address(0x0), "Stargate: _token cannot be 0x0");
        require(_router != address(0x0), "Stargate: _router cannot be 0x0");
        poolId = _poolId;
        router = _router;
        token = _token;
        sharedDecimals = _sharedDecimals;
        decimals = uint8(_sharedDecimals);
        localDecimals = _localDecimals;
        convertRate = 10**(uint256(localDecimals).sub(sharedDecimals));
        totalWeight = 0;
        feeLibrary = _feeLibrary;
        //delta algo related
        batched = false;
        defaultSwapMode = true;
        defaultLPMode = true;
    }
    function getChainPathsLength() public view returns (uint256) {
        return chainPaths.length;
    }
    //---------------------------------------------------------------------------
    // LOCAL CHAIN FUNCTIONS
    function mint(address _to, uint256 _amountLD) external nonReentrant onlyRouter returns (uint256) {
        return _mintLocal(_to, _amountLD, true, true);
    }
    // Local                                    Remote
    // -------                                  ---------
    // swap             ->                      swapRemote
    function swap(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        address _from,
        uint256 _amountLD,
        uint256 _minAmountLD,
        bool newLiquidity
    ) external nonReentrant onlyRouter returns (SwapObj memory) {
        require(!stopSwap, "Stargate: swap func stopped");
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == true, "Stargate: counter chainPath is not ready");
        uint256 amountSD = amountLDtoSD(_amountLD);
        uint256 minAmountSD = amountLDtoSD(_minAmountLD);
        // request fee params from library
        SwapObj memory s = IStargateFeeLibrary(feeLibrary).getFees(poolId, _dstPoolId, _dstChainId, _from, amountSD);
        // equilibrium fee and reward. note eqFee/eqReward are separated from swap liquidity
        eqFeePool = eqFeePool.sub(s.eqReward);
        // update the new amount the user gets minus the fees
        s.amount = amountSD.sub(s.eqFee).sub(s.protocolFee).sub(s.lpFee);
        // users will also get the eqReward
        require(s.amount.add(s.eqReward) >= minAmountSD, "Stargate: slippage too high");
        // behaviours
        //     - protocolFee: booked, stayed and withdrawn at remote.
        //     - eqFee: booked, stayed and withdrawn at remote.
        //     - lpFee: booked and stayed at remote, can be withdrawn anywhere
        s.lkbRemove = amountSD.sub(s.lpFee).add(s.eqReward);
        // check for transfer solvency.
        require(cp.balance >= s.lkbRemove, "Stargate: dst balance too low");
        cp.balance = cp.balance.sub(s.lkbRemove);
        if (newLiquidity) {
            deltaCredit = deltaCredit.add(amountSD).add(s.eqReward);
        } else if (s.eqReward > 0) {
            deltaCredit = deltaCredit.add(s.eqReward);
        }
        // distribute credits on condition.
        if (!batched || deltaCredit >= totalLiquidity.mul(swapDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultSwapMode);
        }
        emit Swap(_dstChainId, _dstPoolId, _from, s.amount, s.eqReward, s.eqFee, s.protocolFee, s.lpFee);
        return s;
    }
    // Local                                    Remote
    // -------                                  ---------
    // sendCredits      ->                      creditChainPath
    function sendCredits(uint16 _dstChainId, uint256 _dstPoolId) external nonReentrant onlyRouter returns (CreditObj memory c) {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == true, "Stargate: counter chainPath is not ready");
        cp.lkb = cp.lkb.add(cp.credits);
        c.idealBalance = totalLiquidity.mul(cp.weight).div(totalWeight);
        c.credits = cp.credits;
        cp.credits = 0;
        emit SendCredits(_dstChainId, _dstPoolId, c.credits, c.idealBalance);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemRemote   ->                        swapRemote
    function redeemRemote(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        address _from,
        uint256 _amountLP
    ) external nonReentrant onlyRouter {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        uint256 amountSD = _burnLocal(_from, _amountLP);
        //run Delta
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultLPMode);
        }
        uint256 amountLD = amountSDtoLD(amountSD);
        emit RedeemRemote(_dstChainId, _dstPoolId, _from, _amountLP, amountLD);
    }
    function instantRedeemLocal(
        address _from,
        uint256 _amountLP,
        address _to
    ) external nonReentrant onlyRouter returns (uint256 amountSD) {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        uint256 _deltaCredit = deltaCredit; // sload optimization.
        uint256 _capAmountLP = _amountSDtoLP(_deltaCredit);
        if (_amountLP > _capAmountLP) _amountLP = _capAmountLP;
        amountSD = _burnLocal(_from, _amountLP);
        deltaCredit = _deltaCredit.sub(amountSD);
        uint256 amountLD = amountSDtoLD(amountSD);
        _safeTransfer(token, _to, amountLD);
        emit InstantRedeemLocal(_from, _amountLP, amountSD, _to);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal   ->                         redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocal(
        address _from,
        uint256 _amountLP,
        uint16 _dstChainId,
        uint256 _dstPoolId,
        bytes calldata _to
    ) external nonReentrant onlyRouter returns (uint256 amountSD) {
        require(_from != address(0x0), "Stargate: _from cannot be 0x0");
        // safeguard.
        require(chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]].ready == true, "Stargate: counter chainPath is not ready");
        amountSD = _burnLocal(_from, _amountLP);
        // run Delta
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(false);
        }
        emit RedeemLocal(_from, _amountLP, amountSD, _dstChainId, _dstPoolId, _to);
    }
    //---------------------------------------------------------------------------
    // REMOTE CHAIN FUNCTIONS
    // Local                                    Remote
    // -------                                  ---------
    // sendCredits      ->                      creditChainPath
    function creditChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        CreditObj memory _c
    ) external nonReentrant onlyRouter {
        ChainPath storage cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        cp.balance = cp.balance.add(_c.credits);
        if (cp.idealBalance != _c.idealBalance) {
            cp.idealBalance = _c.idealBalance;
        }
        emit CreditChainPath(_dstChainId, _dstPoolId, _c.credits, _c.idealBalance);
    }
    // Local                                    Remote
    // -------                                  ---------
    // swap             ->                      swapRemote
    function swapRemote(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        address _to,
        SwapObj memory _s
    ) external nonReentrant onlyRouter returns (uint256 amountLD) {
        // booking lpFee
        totalLiquidity = totalLiquidity.add(_s.lpFee);
        // booking eqFee
        eqFeePool = eqFeePool.add(_s.eqFee);
        // booking stargateFee
        protocolFeeBalance = protocolFeeBalance.add(_s.protocolFee);
        // update LKB
        uint256 chainPathIndex = chainPathIndexLookup[_srcChainId][_srcPoolId];
        chainPaths[chainPathIndex].lkb = chainPaths[chainPathIndex].lkb.sub(_s.lkbRemove);
        // user receives the amount + the srcReward
        amountLD = amountSDtoLD(_s.amount.add(_s.eqReward));
        _safeTransfer(token, _to, amountLD);
        emit SwapRemote(_to, _s.amount.add(_s.eqReward), _s.protocolFee, _s.eqFee);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal   ->                         redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocalCallback(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        address _to,
        uint256 _amountSD,
        uint256 _amountToMintSD
    ) external nonReentrant onlyRouter {
        if (_amountToMintSD > 0) {
            _mintLocal(_to, amountSDtoLD(_amountToMintSD), false, false);
        }
        ChainPath storage cp = getAndCheckCP(_srcChainId, _srcPoolId);
        cp.lkb = cp.lkb.sub(_amountSD);
        uint256 amountLD = amountSDtoLD(_amountSD);
        _safeTransfer(token, _to, amountLD);
        emit RedeemLocalCallback(_to, _amountSD, _amountToMintSD);
    }
    // Local                                    Remote
    // -------                                  ---------
    // redeemLocal(amount)   ->               redeemLocalCheckOnRemote
    // redeemLocalCallback             <-
    function redeemLocalCheckOnRemote(
        uint16 _srcChainId,
        uint256 _srcPoolId,
        uint256 _amountSD
    ) external nonReentrant onlyRouter returns (uint256 swapAmount, uint256 mintAmount) {
        ChainPath storage cp = getAndCheckCP(_srcChainId, _srcPoolId);
        if (_amountSD > cp.balance) {
            mintAmount = _amountSD - cp.balance;
            swapAmount = cp.balance;
            cp.balance = 0;
        } else {
            cp.balance = cp.balance.sub(_amountSD);
            swapAmount = _amountSD;
            mintAmount = 0;
        }
        emit WithdrawRemote(_srcChainId, _srcPoolId, swapAmount, mintAmount);
    }
    //---------------------------------------------------------------------------
    // DAO Calls
    function createChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint256 _weight
    ) external onlyRouter {
        for (uint256 i = 0; i < chainPaths.length; ++i) {
            ChainPath memory cp = chainPaths[i];
            bool exists = cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId;
            require(!exists, "Stargate: cant createChainPath of existing dstChainId and _dstPoolId");
        }
        totalWeight = totalWeight.add(_weight);
        chainPathIndexLookup[_dstChainId][_dstPoolId] = chainPaths.length;
        chainPaths.push(ChainPath(false, _dstChainId, _dstPoolId, _weight, 0, 0, 0, 0));
        emit ChainPathUpdate(_dstChainId, _dstPoolId, _weight);
    }
    function setWeightForChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint16 _weight
    ) external onlyRouter {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        totalWeight = totalWeight.sub(cp.weight).add(_weight);
        cp.weight = _weight;
        emit ChainPathUpdate(_dstChainId, _dstPoolId, _weight);
    }
    function setFee(uint256 _mintFeeBP) external onlyRouter {
        require(_mintFeeBP <= BP_DENOMINATOR, "Bridge: cum fees > 100%");
        mintFeeBP = _mintFeeBP;
        emit FeesUpdated(mintFeeBP);
    }
    function setFeeLibrary(address _feeLibraryAddr) external onlyRouter {
        require(_feeLibraryAddr != address(0x0), "Stargate: fee library cant be 0x0");
        feeLibrary = _feeLibraryAddr;
        emit FeeLibraryUpdated(_feeLibraryAddr);
    }
    function setSwapStop(bool _swapStop) external onlyRouter {
        stopSwap = _swapStop;
        emit StopSwapUpdated(_swapStop);
    }
    function setDeltaParam(
        bool _batched,
        uint256 _swapDeltaBP,
        uint256 _lpDeltaBP,
        bool _defaultSwapMode,
        bool _defaultLPMode
    ) external onlyRouter {
        require(_swapDeltaBP <= BP_DENOMINATOR && _lpDeltaBP <= BP_DENOMINATOR, "Stargate: wrong Delta param");
        batched = _batched;
        swapDeltaBP = _swapDeltaBP;
        lpDeltaBP = _lpDeltaBP;
        defaultSwapMode = _defaultSwapMode;
        defaultLPMode = _defaultLPMode;
        emit DeltaParamUpdated(_batched, _swapDeltaBP, _lpDeltaBP, _defaultSwapMode, _defaultLPMode);
    }
    function callDelta(bool _fullMode) external onlyRouter {
        _delta(_fullMode);
    }
    function activateChainPath(uint16 _dstChainId, uint256 _dstPoolId) external onlyRouter {
        ChainPath storage cp = getAndCheckCP(_dstChainId, _dstPoolId);
        require(cp.ready == false, "Stargate: chainPath is already active");
        // this func will only be called once
        cp.ready = true;
    }
    function withdrawProtocolFeeBalance(address _to) external onlyRouter {
        if (protocolFeeBalance > 0) {
            uint256 amountOfLD = amountSDtoLD(protocolFeeBalance);
            protocolFeeBalance = 0;
            _safeTransfer(token, _to, amountOfLD);
            emit WithdrawProtocolFeeBalance(_to, amountOfLD);
        }
    }
    function withdrawMintFeeBalance(address _to) external onlyRouter {
        if (mintFeeBalance > 0) {
            uint256 amountOfLD = amountSDtoLD(mintFeeBalance);
            mintFeeBalance = 0;
            _safeTransfer(token, _to, amountOfLD);
            emit WithdrawMintFeeBalance(_to, amountOfLD);
        }
    }
    //---------------------------------------------------------------------------
    // INTERNAL
    // Conversion Helpers
    //---------------------------------------------------------------------------
    function amountLPtoLD(uint256 _amountLP) external view returns (uint256) {
        return amountSDtoLD(_amountLPtoSD(_amountLP));
    }
    function _amountLPtoSD(uint256 _amountLP) internal view returns (uint256) {
        require(totalSupply > 0, "Stargate: cant convert LPtoSD when totalSupply == 0");
        return _amountLP.mul(totalLiquidity).div(totalSupply);
    }
    function _amountSDtoLP(uint256 _amountSD) internal view returns (uint256) {
        require(totalLiquidity > 0, "Stargate: cant convert SDtoLP when totalLiq == 0");
        return _amountSD.mul(totalSupply).div(totalLiquidity);
    }
    function amountSDtoLD(uint256 _amount) internal view returns (uint256) {
        return _amount.mul(convertRate);
    }
    function amountLDtoSD(uint256 _amount) internal view returns (uint256) {
        return _amount.div(convertRate);
    }
    function getAndCheckCP(uint16 _dstChainId, uint256 _dstPoolId) internal view returns (ChainPath storage) {
        require(chainPaths.length > 0, "Stargate: no chainpaths exist");
        ChainPath storage cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        require(cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId, "Stargate: local chainPath does not exist");
        return cp;
    }
    function getChainPath(uint16 _dstChainId, uint256 _dstPoolId) external view returns (ChainPath memory) {
        ChainPath memory cp = chainPaths[chainPathIndexLookup[_dstChainId][_dstPoolId]];
        require(cp.dstChainId == _dstChainId && cp.dstPoolId == _dstPoolId, "Stargate: local chainPath does not exist");
        return cp;
    }
    function _burnLocal(address _from, uint256 _amountLP) internal returns (uint256) {
        require(totalSupply > 0, "Stargate: cant burn when totalSupply == 0");
        uint256 amountOfLPTokens = balanceOf[_from];
        require(amountOfLPTokens >= _amountLP, "Stargate: not enough LP tokens to burn");
        uint256 amountSD = _amountLP.mul(totalLiquidity).div(totalSupply);
        //subtract totalLiquidity accordingly
        totalLiquidity = totalLiquidity.sub(amountSD);
        _burn(_from, _amountLP);
        emit Burn(_from, _amountLP, amountSD);
        return amountSD;
    }
    function _delta(bool fullMode) internal {
        if (deltaCredit > 0 && totalWeight > 0) {
            uint256 cpLength = chainPaths.length;
            uint256[] memory deficit = new uint256[](cpLength);
            uint256 totalDeficit = 0;
            // algorithm steps 6-9: calculate the total and the amounts required to get to balance state
            for (uint256 i = 0; i < cpLength; ++i) {
                ChainPath storage cp = chainPaths[i];
                // (liquidity * (weight/totalWeight)) - (lkb+credits)
                uint256 balLiq = totalLiquidity.mul(cp.weight).div(totalWeight);
                uint256 currLiq = cp.lkb.add(cp.credits);
                if (balLiq > currLiq) {
                    // save gas since we know balLiq > currLiq and we know deficit[i] > 0
                    deficit[i] = balLiq - currLiq;
                    totalDeficit = totalDeficit.add(deficit[i]);
                }
            }
            // indicates how much delta credit is distributed
            uint256 spent;
            // handle credits with 2 tranches. the [ < totalDeficit] [excessCredit]
            // run full Delta, allocate all credits
            if (totalDeficit == 0) {
                // only fullMode delta will allocate excess credits
                if (fullMode && deltaCredit > 0) {
                    // credit ChainPath by weights
                    for (uint256 i = 0; i < cpLength; ++i) {
                        ChainPath storage cp = chainPaths[i];
                        // credits = credits + toBalanceChange + remaining allocation based on weight
                        uint256 amtToCredit = deltaCredit.mul(cp.weight).div(totalWeight);
                        spent = spent.add(amtToCredit);
                        cp.credits = cp.credits.add(amtToCredit);
                    }
                } // else do nth
            } else if (totalDeficit <= deltaCredit) {
                if (fullMode) {
                    // algorithm step 13: calculate amount to disperse to bring to balance state or as close as possible
                    uint256 excessCredit = deltaCredit - totalDeficit;
                    // algorithm steps 14-16: calculate credits
                    for (uint256 i = 0; i < cpLength; ++i) {
                        if (deficit[i] > 0) {
                            ChainPath storage cp = chainPaths[i];
                            // credits = credits + deficit + remaining allocation based on weight
                            uint256 amtToCredit = deficit[i].add(excessCredit.mul(cp.weight).div(totalWeight));
                            spent = spent.add(amtToCredit);
                            cp.credits = cp.credits.add(amtToCredit);
                        }
                    }
                } else {
                    // totalDeficit <= deltaCredit but not running fullMode
                    // credit chainPaths as is if any deficit, not using all deltaCredit
                    for (uint256 i = 0; i < cpLength; ++i) {
                        if (deficit[i] > 0) {
                            ChainPath storage cp = chainPaths[i];
                            uint256 amtToCredit = deficit[i];
                            spent = spent.add(amtToCredit);
                            cp.credits = cp.credits.add(amtToCredit);
                        }
                    }
                }
            } else {
                // totalDeficit > deltaCredit, fullMode or not, normalize the deficit by deltaCredit
                for (uint256 i = 0; i < cpLength; ++i) {
                    if (deficit[i] > 0) {
                        ChainPath storage cp = chainPaths[i];
                        uint256 proportionalDeficit = deficit[i].mul(deltaCredit).div(totalDeficit);
                        spent = spent.add(proportionalDeficit);
                        cp.credits = cp.credits.add(proportionalDeficit);
                    }
                }
            }
            // deduct the amount of credit sent
            deltaCredit = deltaCredit.sub(spent);
        }
    }
    function _mintLocal(
        address _to,
        uint256 _amountLD,
        bool _feesEnabled,
        bool _creditDelta
    ) internal returns (uint256 amountSD) {
        require(totalWeight > 0, "Stargate: No ChainPaths exist");
        amountSD = amountLDtoSD(_amountLD);
        uint256 mintFeeSD = 0;
        if (_feesEnabled) {
            mintFeeSD = amountSD.mul(mintFeeBP).div(BP_DENOMINATOR);
            amountSD = amountSD.sub(mintFeeSD);
            mintFeeBalance = mintFeeBalance.add(mintFeeSD);
        }
        if (_creditDelta) {
            deltaCredit = deltaCredit.add(amountSD);
        }
        uint256 amountLPTokens = amountSD;
        if (totalSupply != 0) {
            amountLPTokens = amountSD.mul(totalSupply).div(totalLiquidity);
        }
        totalLiquidity = totalLiquidity.add(amountSD);
        _mint(_to, amountLPTokens);
        emit Mint(_to, amountLPTokens, amountSD, mintFeeSD);
        // add to credits and call delta. short circuit to save gas
        if (!batched || deltaCredit > totalLiquidity.mul(lpDeltaBP).div(BP_DENOMINATOR)) {
            _delta(defaultLPMode);
        }
    }
    function _safeTransfer(
        address _token,
        address _to,
        uint256 _value
    ) private {
        (bool success, bytes memory data) = _token.call(abi.encodeWithSelector(SELECTOR, _to, _value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "Stargate: TRANSFER_FAILED");
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
// imports
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./Factory.sol";
import "./Pool.sol";
import "./Bridge.sol";
// interfaces
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./interfaces/IStargateRouter.sol";
import "./interfaces/IStargateReceiver.sol";
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
contract Router is IStargateRouter, Ownable, ReentrancyGuard {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    uint8 internal constant TYPE_REDEEM_LOCAL_RESPONSE = 1;
    uint8 internal constant TYPE_REDEEM_LOCAL_CALLBACK_RETRY = 2;
    uint8 internal constant TYPE_SWAP_REMOTE_RETRY = 3;
    //---------------------------------------------------------------------------
    // STRUCTS
    struct CachedSwap {
        address token;
        uint256 amountLD;
        address to;
        bytes payload;
    }
    //---------------------------------------------------------------------------
    // VARIABLES
    Factory public factory; // used for creating pools
    address public protocolFeeOwner; // can call methods to pull Stargate fees collected in pools
    address public mintFeeOwner; // can call methods to pull mint fees collected in pools
    Bridge public bridge;
    mapping(uint16 => mapping(bytes => mapping(uint256 => bytes))) public revertLookup; //[chainId][srcAddress][nonce]
    mapping(uint16 => mapping(bytes => mapping(uint256 => CachedSwap))) public cachedSwapLookup; //[chainId][srcAddress][nonce]
    //---------------------------------------------------------------------------
    // EVENTS
    event Revert(uint8 bridgeFunctionType, uint16 chainId, bytes srcAddress, uint256 nonce);
    event CachedSwapSaved(uint16 chainId, bytes srcAddress, uint256 nonce, address token, uint256 amountLD, address to, bytes payload, bytes reason);
    event RevertRedeemLocal(uint16 srcChainId, uint256 _srcPoolId, uint256 _dstPoolId, bytes to, uint256 redeemAmountSD, uint256 mintAmountSD, uint256 indexed nonce, bytes indexed srcAddress);
    event RedeemLocalCallback(uint16 srcChainId, bytes indexed srcAddress, uint256 indexed nonce, uint256 srcPoolId, uint256 dstPoolId, address to, uint256 amountSD, uint256 mintAmountSD);
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyBridge() {
        require(msg.sender == address(bridge), "Bridge: caller must be Bridge.");
        _;
    }
    constructor() {}
    function setBridgeAndFactory(Bridge _bridge, Factory _factory) external onlyOwner {
        require(address(bridge) == address(0x0) && address(factory) == address(0x0), "Stargate: bridge and factory already initialized"); // 1 time only
        require(address(_bridge) != address(0x0), "Stargate: bridge cant be 0x0");
        require(address(_factory) != address(0x0), "Stargate: factory cant be 0x0");
        bridge = _bridge;
        factory = _factory;
    }
    //---------------------------------------------------------------------------
    // VIEWS
    function _getPool(uint256 _poolId) internal view returns (Pool pool) {
        pool = factory.getPool(_poolId);
        require(address(pool) != address(0x0), "Stargate: Pool does not exist");
    }
    //---------------------------------------------------------------------------
    // INTERNAL
    function _safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) private {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "Stargate: TRANSFER_FROM_FAILED");
    }
    //---------------------------------------------------------------------------
    // LOCAL CHAIN FUNCTIONS
    function addLiquidity(
        uint256 _poolId,
        uint256 _amountLD,
        address _to
    ) external override nonReentrant {
        Pool pool = _getPool(_poolId);
        uint256 convertRate = pool.convertRate();
        _amountLD = _amountLD.div(convertRate).mul(convertRate);
        _safeTransferFrom(pool.token(), msg.sender, address(pool), _amountLD);
        pool.mint(_to, _amountLD);
    }
    function swap(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLD,
        uint256 _minAmountLD,
        lzTxObj memory _lzTxParams,
        bytes calldata _to,
        bytes calldata _payload
    ) external payable override nonReentrant {
        require(_amountLD > 0, "Stargate: cannot swap 0");
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        Pool.SwapObj memory s;
        Pool.CreditObj memory c;
        {
            Pool pool = _getPool(_srcPoolId);
            {
                uint256 convertRate = pool.convertRate();
                _amountLD = _amountLD.div(convertRate).mul(convertRate);
            }
            s = pool.swap(_dstChainId, _dstPoolId, msg.sender, _amountLD, _minAmountLD, true);
            _safeTransferFrom(pool.token(), msg.sender, address(pool), _amountLD);
            c = pool.sendCredits(_dstChainId, _dstPoolId);
        }
        bridge.swap{value: msg.value}(_dstChainId, _srcPoolId, _dstPoolId, _refundAddress, c, s, _lzTxParams, _to, _payload);
    }
    function redeemRemote(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        uint256 _minAmountLD,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable override nonReentrant {
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        require(_amountLP > 0, "Stargate: not enough lp to redeemRemote");
        Pool.SwapObj memory s;
        Pool.CreditObj memory c;
        {
            Pool pool = _getPool(_srcPoolId);
            uint256 amountLD = pool.amountLPtoLD(_amountLP);
            // perform a swap with no liquidity
            s = pool.swap(_dstChainId, _dstPoolId, msg.sender, amountLD, _minAmountLD, false);
            pool.redeemRemote(_dstChainId, _dstPoolId, msg.sender, _amountLP);
            c = pool.sendCredits(_dstChainId, _dstPoolId);
        }
        // equal to a swap, with no payload ("0x") no dstGasForCall 0
        bridge.swap{value: msg.value}(_dstChainId, _srcPoolId, _dstPoolId, _refundAddress, c, s, _lzTxParams, _to, "");
    }
    function instantRedeemLocal(
        uint16 _srcPoolId,
        uint256 _amountLP,
        address _to
    ) external override nonReentrant returns (uint256 amountSD) {
        require(_amountLP > 0, "Stargate: not enough lp to redeem");
        Pool pool = _getPool(_srcPoolId);
        amountSD = pool.instantRedeemLocal(msg.sender, _amountLP, _to);
    }
    function redeemLocal(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable override nonReentrant {
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        Pool pool = _getPool(_srcPoolId);
        require(_amountLP > 0, "Stargate: not enough lp to redeem");
        uint256 amountSD = pool.redeemLocal(msg.sender, _amountLP, _dstChainId, _dstPoolId, _to);
        require(amountSD > 0, "Stargate: not enough lp to redeem with amountSD");
        Pool.CreditObj memory c = pool.sendCredits(_dstChainId, _dstPoolId);
        bridge.redeemLocal{value: msg.value}(_dstChainId, _srcPoolId, _dstPoolId, _refundAddress, c, amountSD, _to, _lzTxParams);
    }
    function sendCredits(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress
    ) external payable override nonReentrant {
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        Pool pool = _getPool(_srcPoolId);
        Pool.CreditObj memory c = pool.sendCredits(_dstChainId, _dstPoolId);
        bridge.sendCredits{value: msg.value}(_dstChainId, _srcPoolId, _dstPoolId, _refundAddress, c);
    }
    function quoteLayerZeroFee(
        uint16 _dstChainId,
        uint8 _functionType,
        bytes calldata _toAddress,
        bytes calldata _transferAndCallPayload,
        Router.lzTxObj memory _lzTxParams
    ) external view override returns (uint256, uint256) {
        return bridge.quoteLayerZeroFee(_dstChainId, _functionType, _toAddress, _transferAndCallPayload, _lzTxParams);
    }
    function revertRedeemLocal(
        uint16 _dstChainId,
        bytes calldata _srcAddress,
        uint256 _nonce,
        address payable _refundAddress,
        lzTxObj memory _lzTxParams
    ) external payable {
        require(_refundAddress != address(0x0), "Stargate: _refundAddress cannot be 0x0");
        bytes memory payload = revertLookup[_dstChainId][_srcAddress][_nonce];
        require(payload.length > 0, "Stargate: no retry revert");
        {
            uint8 functionType;
            assembly {
                functionType := mload(add(payload, 32))
            }
            require(functionType == TYPE_REDEEM_LOCAL_RESPONSE, "Stargate: invalid function type");
        }
        // empty it
        revertLookup[_dstChainId][_srcAddress][_nonce] = "";
        uint256 srcPoolId;
        uint256 dstPoolId;
        assembly {
            srcPoolId := mload(add(payload, 64))
            dstPoolId := mload(add(payload, 96))
        }
        Pool.CreditObj memory c;
        {
            Pool pool = _getPool(dstPoolId);
            c = pool.sendCredits(_dstChainId, srcPoolId);
        }
        bridge.redeemLocalCallback{value: msg.value}(_dstChainId, _refundAddress, c, _lzTxParams, payload);
    }
    function retryRevert(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        uint256 _nonce
    ) external payable {
        bytes memory payload = revertLookup[_srcChainId][_srcAddress][_nonce];
        require(payload.length > 0, "Stargate: no retry revert");
        // empty it
        revertLookup[_srcChainId][_srcAddress][_nonce] = "";
        uint8 functionType;
        assembly {
            functionType := mload(add(payload, 32))
        }
        if (functionType == TYPE_REDEEM_LOCAL_CALLBACK_RETRY) {
            (, uint256 srcPoolId, uint256 dstPoolId, address to, uint256 amountSD, uint256 mintAmountSD) = abi.decode(
                payload,
                (uint8, uint256, uint256, address, uint256, uint256)
            );
            _redeemLocalCallback(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, to, amountSD, mintAmountSD);
        }
        // for retrying the swapRemote. if it fails again, retry
        else if (functionType == TYPE_SWAP_REMOTE_RETRY) {
            (, uint256 srcPoolId, uint256 dstPoolId, uint256 dstGasForCall, address to, Pool.SwapObj memory s, bytes memory p) = abi.decode(
                payload,
                (uint8, uint256, uint256, uint256, address, Pool.SwapObj, bytes)
            );
            _swapRemote(_srcChainId, _srcAddress, _nonce, srcPoolId, dstPoolId, dstGasForCall, to, s, p);
        } else {
            revert("Stargate: invalid function type");
        }
    }
    function clearCachedSwap(
        uint16 _srcChainId,
        bytes calldata _srcAddress,
        uint256 _nonce
    ) external {
        CachedSwap memory cs = cachedSwapLookup[_srcChainId][_srcAddress][_nonce];
        require(cs.to != address(0x0), "Stargate: cache already cleared");
        // clear the data
        cachedSwapLookup[_srcChainId][_srcAddress][_nonce] = CachedSwap(address(0x0), 0, address(0x0), "");
        IStargateReceiver(cs.to).sgReceive(_srcChainId, _srcAddress, _nonce, cs.token, cs.amountLD, cs.payload);
    }
    function creditChainPath(
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint256 _srcPoolId,
        Pool.CreditObj memory _c
    ) external onlyBridge {
        Pool pool = _getPool(_srcPoolId);
        pool.creditChainPath(_dstChainId, _dstPoolId, _c);
    }
    //---------------------------------------------------------------------------
    // REMOTE CHAIN FUNCTIONS
    function redeemLocalCheckOnRemote(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint256 _amountSD,
        bytes calldata _to
    ) external onlyBridge {
        Pool pool = _getPool(_dstPoolId);
        try pool.redeemLocalCheckOnRemote(_srcChainId, _srcPoolId, _amountSD) returns (uint256 redeemAmountSD, uint256 mintAmountSD) {
            revertLookup[_srcChainId][_srcAddress][_nonce] = abi.encode(
                TYPE_REDEEM_LOCAL_RESPONSE,
                _srcPoolId,
                _dstPoolId,
                redeemAmountSD,
                mintAmountSD,
                _to
            );
            emit RevertRedeemLocal(_srcChainId, _srcPoolId, _dstPoolId, _to, redeemAmountSD, mintAmountSD, _nonce, _srcAddress);
        } catch {
            // if the func fail, return [swapAmount: 0, mintAMount: _amountSD]
            // swapAmount represents the amount of chainPath balance deducted on the remote side, which because the above tx failed, should be 0
            // mintAmount is the full amount of tokens the user attempted to redeem on the src side, which gets converted back into the lp amount
            revertLookup[_srcChainId][_srcAddress][_nonce] = abi.encode(TYPE_REDEEM_LOCAL_RESPONSE, _srcPoolId, _dstPoolId, 0, _amountSD, _to);
            emit Revert(TYPE_REDEEM_LOCAL_RESPONSE, _srcChainId, _srcAddress, _nonce);
        }
    }
    function redeemLocalCallback(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address _to,
        uint256 _amountSD,
        uint256 _mintAmountSD
    ) external onlyBridge {
        _redeemLocalCallback(_srcChainId, _srcAddress, _nonce, _srcPoolId, _dstPoolId, _to, _amountSD, _mintAmountSD);
    }
    function _redeemLocalCallback(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address _to,
        uint256 _amountSD,
        uint256 _mintAmountSD
    ) internal {
        Pool pool = _getPool(_dstPoolId);
        try pool.redeemLocalCallback(_srcChainId, _srcPoolId, _to, _amountSD, _mintAmountSD) {} catch {
            revertLookup[_srcChainId][_srcAddress][_nonce] = abi.encode(
                TYPE_REDEEM_LOCAL_CALLBACK_RETRY,
                _srcPoolId,
                _dstPoolId,
                _to,
                _amountSD,
                _mintAmountSD
            );
            emit Revert(TYPE_REDEEM_LOCAL_CALLBACK_RETRY, _srcChainId, _srcAddress, _nonce);
        }
        emit RedeemLocalCallback(_srcChainId, _srcAddress, _nonce, _srcPoolId, _dstPoolId, _to, _amountSD, _mintAmountSD);
    }
    function swapRemote(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint256 _dstGasForCall,
        address _to,
        Pool.SwapObj memory _s,
        bytes memory _payload
    ) external onlyBridge {
        _swapRemote(_srcChainId, _srcAddress, _nonce, _srcPoolId, _dstPoolId, _dstGasForCall, _to, _s, _payload);
    }
    function _swapRemote(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint256 _dstGasForCall,
        address _to,
        Pool.SwapObj memory _s,
        bytes memory _payload
    ) internal {
        Pool pool = _getPool(_dstPoolId);
        // first try catch the swap remote
        try pool.swapRemote(_srcChainId, _srcPoolId, _to, _s) returns (uint256 amountLD) {
            if (_payload.length > 0) {
                // then try catch the external contract call
                try IStargateReceiver(_to).sgReceive{gas: _dstGasForCall}(_srcChainId, _srcAddress, _nonce, pool.token(), amountLD, _payload) {
                    // do nothing
                } catch (bytes memory reason) {
                    cachedSwapLookup[_srcChainId][_srcAddress][_nonce] = CachedSwap(pool.token(), amountLD, _to, _payload);
                    emit CachedSwapSaved(_srcChainId, _srcAddress, _nonce, pool.token(), amountLD, _to, _payload, reason);
                }
            }
        } catch {
            revertLookup[_srcChainId][_srcAddress][_nonce] = abi.encode(
                TYPE_SWAP_REMOTE_RETRY,
                _srcPoolId,
                _dstPoolId,
                _dstGasForCall,
                _to,
                _s,
                _payload
            );
            emit Revert(TYPE_SWAP_REMOTE_RETRY, _srcChainId, _srcAddress, _nonce);
        }
    }
    //---------------------------------------------------------------------------
    // DAO Calls
    function createPool(
        uint256 _poolId,
        address _token,
        uint8 _sharedDecimals,
        uint8 _localDecimals,
        string memory _name,
        string memory _symbol
    ) external onlyOwner returns (address) {
        require(_token != address(0x0), "Stargate: _token cannot be 0x0");
        return factory.createPool(_poolId, _token, _sharedDecimals, _localDecimals, _name, _symbol);
    }
    function createChainPath(
        uint256 _poolId,
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint256 _weight
    ) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.createChainPath(_dstChainId, _dstPoolId, _weight);
    }
    function activateChainPath(
        uint256 _poolId,
        uint16 _dstChainId,
        uint256 _dstPoolId
    ) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.activateChainPath(_dstChainId, _dstPoolId);
    }
    function setWeightForChainPath(
        uint256 _poolId,
        uint16 _dstChainId,
        uint256 _dstPoolId,
        uint16 _weight
    ) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setWeightForChainPath(_dstChainId, _dstPoolId, _weight);
    }
    function setProtocolFeeOwner(address _owner) external onlyOwner {
        require(_owner != address(0x0), "Stargate: _owner cannot be 0x0");
        protocolFeeOwner = _owner;
    }
    function setMintFeeOwner(address _owner) external onlyOwner {
        require(_owner != address(0x0), "Stargate: _owner cannot be 0x0");
        mintFeeOwner = _owner;
    }
    function setFees(uint256 _poolId, uint256 _mintFeeBP) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setFee(_mintFeeBP);
    }
    function setFeeLibrary(uint256 _poolId, address _feeLibraryAddr) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setFeeLibrary(_feeLibraryAddr);
    }
    function setSwapStop(uint256 _poolId, bool _swapStop) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setSwapStop(_swapStop);
    }
    function setDeltaParam(
        uint256 _poolId,
        bool _batched,
        uint256 _swapDeltaBP,
        uint256 _lpDeltaBP,
        bool _defaultSwapMode,
        bool _defaultLPMode
    ) external onlyOwner {
        Pool pool = _getPool(_poolId);
        pool.setDeltaParam(_batched, _swapDeltaBP, _lpDeltaBP, _defaultSwapMode, _defaultLPMode);
    }
    function callDelta(uint256 _poolId, bool _fullMode) external {
        Pool pool = _getPool(_poolId);
        pool.callDelta(_fullMode);
    }
    function withdrawMintFee(uint256 _poolId, address _to) external {
        require(mintFeeOwner == msg.sender, "Stargate: only mintFeeOwner");
        Pool pool = _getPool(_poolId);
        pool.withdrawMintFeeBalance(_to);
    }
    function withdrawProtocolFee(uint256 _poolId, address _to) external {
        require(protocolFeeOwner == msg.sender, "Stargate: only protocolFeeOwner");
        Pool pool = _getPool(_poolId);
        pool.withdrawProtocolFeeBalance(_to);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroReceiver {
    // @notice LayerZero endpoint will invoke this function to deliver the message on the destination
    // @param _srcChainId - the source endpoint identifier
    // @param _srcAddress - the source sending contract address from the source chain
    // @param _nonce - the ordered message nonce
    // @param _payload - the signed payload is the UA bytes has encoded to be sent
    function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) external;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
import "./ILayerZeroUserApplicationConfig.sol";
interface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {
    // @notice send a LayerZero message to the specified address at a LayerZero endpoint.
    // @param _dstChainId - the destination chain identifier
    // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains
    // @param _payload - a custom bytes payload to send to the destination contract
    // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address
    // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction
    // @param _adapterParams - parameters for custom functionality. ie: pay for a specified destination gasAmount, or receive airdropped native gas from the relayer on destination
    function send(uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;
    // @notice used by the messaging library to publish verified payload
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source contract (as bytes) at the source chain
    // @param _dstAddress - the address on destination chain
    // @param _nonce - the unbound message ordering nonce
    // @param _gasLimit - the gas limit for external contract execution
    // @param _payload - verified payload to send to the destination contract
    function receivePayload(uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload) external;
    // @notice get the inboundNonce of a receiver from a source chain which could be EVM or non-EVM chain
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64);
    // @notice get the outboundNonce from this source chain which, consequently, is always an EVM
    // @param _srcAddress - the source chain contract address
    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64);
    // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery
    // @param _dstChainId - the destination chain identifier
    // @param _userApplication - the user app address on this EVM chain
    // @param _payload - the custom message to send over LayerZero
    // @param _payInZRO - if false, user app pays the protocol fee in native token
    // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain
    function estimateFees(uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);
    // @notice get this Endpoint's immutable source identifier
    function getChainId() external view returns (uint16);
    // @notice the interface to retry failed message on this Endpoint destination
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    // @param _payload - the payload to be retried
    function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external;
    // @notice query if any STORED payload (message blocking) at the endpoint.
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool);
    // @notice query if the _libraryAddress is valid for sending msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getSendLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the _libraryAddress is valid for receiving msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getReceiveLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the non-reentrancy guard for send() is on
    // @return true if the guard is on. false otherwise
    function isSendingPayload() external view returns (bool);
    // @notice query if the non-reentrancy guard for receive() is on
    // @return true if the guard is on. false otherwise
    function isReceivingPayload() external view returns (bool);
    // @notice get the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _userApplication - the contract address of the user application
    // @param _configType - type of configuration. every messaging library has its own convention.
    function getConfig(uint16 _version, uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);
    // @notice get the send() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getSendVersion(address _userApplication) external view returns (uint16);
    // @notice get the lzReceive() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getReceiveVersion(address _userApplication) external view returns (uint16);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroUserApplicationConfig {
    // @notice set the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _configType - type of configuration. every messaging library has its own convention.
    // @param _config - configuration in the bytes. can encode arbitrary content.
    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external;
    // @notice set the send() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setSendVersion(uint16 _version) external;
    // @notice set the lzReceive() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setReceiveVersion(uint16 _version) external;
    // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload
    // @param _srcChainId - the chainId of the source chain
    // @param _srcAddress - the contract address of the source contract at the source chain
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    constructor () {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
// libraries
import "@openzeppelin/contracts/math/SafeMath.sol";
contract LPTokenERC20 {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // CONSTANTS
    string public name;
    string public symbol;
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    // set in constructor
    bytes32 public DOMAIN_SEPARATOR;
    //---------------------------------------------------------------------------
    // VARIABLES
    uint256 public decimals;
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    mapping(address => uint256) public nonces;
    //---------------------------------------------------------------------------
    // EVENTS
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);
    constructor(string memory _name, string memory _symbol) {
        name = _name;
        symbol = _symbol;
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name)),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
    }
    function _mint(address to, uint256 value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }
    function _burn(address from, uint256 value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }
    function _approve(
        address owner,
        address spender,
        uint256 value
    ) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }
    function _transfer(
        address from,
        address to,
        uint256 value
    ) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }
    function approve(address spender, uint256 value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }
    function transfer(address to, uint256 value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool) {
        if (allowance[from][msg.sender] != uint256(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender].add(addedValue));
        return true;
    }
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, allowance[msg.sender][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(deadline >= block.timestamp, "Bridge: EXPIRED");
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\\x19\\x01",
                DOMAIN_SEPARATOR,
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress != address(0) && recoveredAddress == owner, "Bridge: INVALID_SIGNATURE");
        _approve(owner, spender, value);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.7.6;
pragma abicoder v2;
import "../Pool.sol";
interface IStargateFeeLibrary {
    function getFees(
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        uint16 _dstChainId,
        address _from,
        uint256 _amountSD
    ) external returns (Pool.SwapObj memory s);
    function getVersion() external view returns (string memory);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./Pool.sol";
contract Factory is Ownable {
    using SafeMath for uint256;
    //---------------------------------------------------------------------------
    // VARIABLES
    mapping(uint256 => Pool) public getPool; // poolId -> PoolInfo
    address[] public allPools;
    address public immutable router;
    address public defaultFeeLibrary; // address for retrieving fee params for swaps
    //---------------------------------------------------------------------------
    // MODIFIERS
    modifier onlyRouter() {
        require(msg.sender == router, "Stargate: caller must be Router.");
        _;
    }
    constructor(address _router) {
        require(_router != address(0x0), "Stargate: _router cant be 0x0"); // 1 time only
        router = _router;
    }
    function setDefaultFeeLibrary(address _defaultFeeLibrary) external onlyOwner {
        require(_defaultFeeLibrary != address(0x0), "Stargate: fee library cant be 0x0");
        defaultFeeLibrary = _defaultFeeLibrary;
    }
    function allPoolsLength() external view returns (uint256) {
        return allPools.length;
    }
    function createPool(
        uint256 _poolId,
        address _token,
        uint8 _sharedDecimals,
        uint8 _localDecimals,
        string memory _name,
        string memory _symbol
    ) public onlyRouter returns (address poolAddress) {
        require(address(getPool[_poolId]) == address(0x0), "Stargate: Pool already created");
        Pool pool = new Pool(_poolId, router, _token, _sharedDecimals, _localDecimals, defaultFeeLibrary, _name, _symbol);
        getPool[_poolId] = pool;
        poolAddress = address(pool);
        allPools.push(poolAddress);
    }
    function renounceOwnership() public override onlyOwner {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);
    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);
    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;
interface IStargateRouter {
    struct lzTxObj {
        uint256 dstGasForCall;
        uint256 dstNativeAmount;
        bytes dstNativeAddr;
    }
    function addLiquidity(
        uint256 _poolId,
        uint256 _amountLD,
        address _to
    ) external;
    function swap(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLD,
        uint256 _minAmountLD,
        lzTxObj memory _lzTxParams,
        bytes calldata _to,
        bytes calldata _payload
    ) external payable;
    function redeemRemote(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        uint256 _minAmountLD,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable;
    function instantRedeemLocal(
        uint16 _srcPoolId,
        uint256 _amountLP,
        address _to
    ) external returns (uint256);
    function redeemLocal(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable;
    function sendCredits(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress
    ) external payable;
    function quoteLayerZeroFee(
        uint16 _dstChainId,
        uint8 _functionType,
        bytes calldata _toAddress,
        bytes calldata _transferAndCallPayload,
        lzTxObj memory _lzTxParams
    ) external view returns (uint256, uint256);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
interface IStargateReceiver {
    function sgReceive(
        uint16 _chainId,
        bytes memory _srcAddress,
        uint256 _nonce,
        address _token,
        uint256 amountLD,
        bytes memory payload
    ) external;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
import "./interfaces/ILayerZeroReceiver.sol";
import "./interfaces/ILayerZeroEndpoint.sol";
import "./interfaces/ILayerZeroMessagingLibrary.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
contract Endpoint is Ownable, ILayerZeroEndpoint {
    uint16 public immutable chainId;
    // installed libraries and reserved versions
    uint16 public constant BLOCK_VERSION = 65535;
    uint16 public constant DEFAULT_VERSION = 0;
    uint16 public latestVersion;
    mapping(uint16 => ILayerZeroMessagingLibrary) public libraryLookup; // version -> ILayerZeroEndpointLibrary
    // default send/receive libraries
    uint16 public defaultSendVersion;
    uint16 public defaultReceiveVersion;
    ILayerZeroMessagingLibrary public defaultSendLibrary;
    address public defaultReceiveLibraryAddress;
    struct LibraryConfig {
        uint16 sendVersion;
        uint16 receiveVersion;
        address receiveLibraryAddress;
        ILayerZeroMessagingLibrary sendLibrary;
    }
    struct StoredPayload {
        uint64 payloadLength;
        address dstAddress;
        bytes32 payloadHash;
    }
    // user app config = [uaAddress]
    mapping(address => LibraryConfig) public uaConfigLookup;
    // inboundNonce = [srcChainId][srcAddress].
    mapping(uint16 => mapping(bytes => uint64)) public inboundNonce;
    // outboundNonce = [dstChainId][srcAddress].
    mapping(uint16 => mapping(address => uint64)) public outboundNonce;
    // storedPayload = [srcChainId][srcAddress]
    mapping(uint16 => mapping(bytes => StoredPayload)) public storedPayload;
    // library versioning events
    event NewLibraryVersionAdded(uint16 version);
    event DefaultSendVersionSet(uint16 version);
    event DefaultReceiveVersionSet(uint16 version);
    event UaSendVersionSet(address ua, uint16 version);
    event UaReceiveVersionSet(address ua, uint16 version);
    event UaForceResumeReceive(uint16 chainId, bytes srcAddress);
    // payload events
    event PayloadCleared(uint16 srcChainId, bytes srcAddress, uint64 nonce, address dstAddress);
    event PayloadStored(uint16 srcChainId, bytes srcAddress, address dstAddress, uint64 nonce, bytes payload, bytes reason);
    constructor(uint16 _chainId) {
        chainId = _chainId;
    }
    //---------------------------------------------------------------------------
    // send and receive nonreentrant lock
    uint8 internal constant _NOT_ENTERED = 1;
    uint8 internal constant _ENTERED = 2;
    uint8 internal _send_entered_state = 1;
    uint8 internal _receive_entered_state = 1;
    modifier sendNonReentrant() {
        require(_send_entered_state == _NOT_ENTERED, "LayerZero: no send reentrancy");
        _send_entered_state = _ENTERED;
        _;
        _send_entered_state = _NOT_ENTERED;
    }
    modifier receiveNonReentrant() {
        require(_receive_entered_state == _NOT_ENTERED, "LayerZero: no receive reentrancy");
        _receive_entered_state = _ENTERED;
        _;
        _receive_entered_state = _NOT_ENTERED;
    }
    // BLOCK_VERSION is also a valid version
    modifier validVersion(uint16 _version) {
        require(_version <= latestVersion || _version == BLOCK_VERSION, "LayerZero: invalid messaging library version");
        _;
    }
    //---------------------------------------------------------------------------
    // User Application Calls - Endpoint Interface
    function send(uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable override sendNonReentrant {
        LibraryConfig storage uaConfig = uaConfigLookup[msg.sender];
        uint64 nonce = ++outboundNonce[_dstChainId][msg.sender];
        _getSendLibrary(uaConfig).send{value: msg.value}(msg.sender, nonce, _dstChainId, _destination, _payload, _refundAddress, _zroPaymentAddress, _adapterParams);
    }
    //---------------------------------------------------------------------------
    // authenticated Library (msg.sender) Calls to pass through Endpoint to UA (dstAddress)
    function receivePayload(uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload) external override receiveNonReentrant {
        // assert and increment the nonce. no message shuffling
        require(_nonce == ++inboundNonce[_srcChainId][_srcAddress], "LayerZero: wrong nonce");
        LibraryConfig storage uaConfig = uaConfigLookup[_dstAddress];
        // authentication to prevent cross-version message validation
        // protects against a malicious library from passing arbitrary data
        if (uaConfig.receiveVersion == DEFAULT_VERSION) {
            require(defaultReceiveLibraryAddress == msg.sender, "LayerZero: invalid default library");
        } else {
            require(uaConfig.receiveLibraryAddress == msg.sender, "LayerZero: invalid library");
        }
        // block if any message blocking
        StoredPayload storage sp = storedPayload[_srcChainId][_srcAddress];
        require(sp.payloadHash == bytes32(0), "LayerZero: in message blocking");
        try ILayerZeroReceiver(_dstAddress).lzReceive{gas: _gasLimit}(_srcChainId, _srcAddress, _nonce, _payload) {
            // success, do nothing, end of the message delivery
        } catch (bytes memory reason) {
            // revert nonce if any uncaught errors/exceptions if the ua chooses the blocking mode
            storedPayload[_srcChainId][_srcAddress] = StoredPayload(uint64(_payload.length), _dstAddress, keccak256(_payload));
            emit PayloadStored(_srcChainId, _srcAddress, _dstAddress, _nonce, _payload, reason);
        }
    }
    function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external override receiveNonReentrant {
        StoredPayload storage sp = storedPayload[_srcChainId][_srcAddress];
        require(sp.payloadHash != bytes32(0), "LayerZero: no stored payload");
        require(_payload.length == sp.payloadLength && keccak256(_payload) == sp.payloadHash, "LayerZero: invalid payload");
        address dstAddress = sp.dstAddress;
        // empty the storedPayload
        sp.payloadLength = 0;
        sp.dstAddress = address(0);
        sp.payloadHash = bytes32(0);
        uint64 nonce = inboundNonce[_srcChainId][_srcAddress];
        ILayerZeroReceiver(dstAddress).lzReceive(_srcChainId, _srcAddress, nonce, _payload);
        emit PayloadCleared(_srcChainId, _srcAddress, nonce, dstAddress);
    }
    //---------------------------------------------------------------------------
    // Owner Calls, only new library version upgrade (3 steps)
    // note libraryLookup[0] = 0x0, no library implementation
    // LIBRARY UPGRADE step 1: set _newLayerZeroLibraryAddress be the new version
    function newVersion(address _newLayerZeroLibraryAddress) external onlyOwner {
        require(_newLayerZeroLibraryAddress != address(0x0), "LayerZero: new version cannot be zero address");
        require(latestVersion < 65535, "LayerZero: can not add new messaging library");
        latestVersion++;
        libraryLookup[latestVersion] = ILayerZeroMessagingLibrary(_newLayerZeroLibraryAddress);
        emit NewLibraryVersionAdded(latestVersion);
    }
    // LIBRARY UPGRADE step 2: stop sending messages from the old version
    function setDefaultSendVersion(uint16 _newDefaultSendVersion) external onlyOwner validVersion(_newDefaultSendVersion) {
        require(_newDefaultSendVersion != DEFAULT_VERSION, "LayerZero: default send version must > 0");
        defaultSendVersion = _newDefaultSendVersion;
        defaultSendLibrary = libraryLookup[defaultSendVersion];
        emit DefaultSendVersionSet(_newDefaultSendVersion);
    }
    // LIBRARY UPGRADE step 3: stop receiving messages from the old version
    function setDefaultReceiveVersion(uint16 _newDefaultReceiveVersion) external onlyOwner validVersion(_newDefaultReceiveVersion) {
        require(_newDefaultReceiveVersion != DEFAULT_VERSION, "LayerZero: default receive version must > 0");
        defaultReceiveVersion = _newDefaultReceiveVersion;
        defaultReceiveLibraryAddress = address(libraryLookup[defaultReceiveVersion]);
        emit DefaultReceiveVersionSet(_newDefaultReceiveVersion);
    }
    //---------------------------------------------------------------------------
    // User Application Calls - UA set/get Interface
    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external override validVersion(_version) {
        if (_version == DEFAULT_VERSION) {
            require(defaultSendVersion == defaultReceiveVersion, "LayerZero: can not set Config during DEFAULT migration");
            _version = defaultSendVersion;
        }
        require(_version != BLOCK_VERSION, "LayerZero: can not set config for BLOCK_VERSION");
        libraryLookup[_version].setConfig(_chainId, msg.sender, _configType, _config);
    }
    // Migration step 1: set the send version
    // Define what library the UA points too
    function setSendVersion(uint16 _newVersion) external override validVersion(_newVersion) {
        // write into config
        LibraryConfig storage uaConfig = uaConfigLookup[msg.sender];
        uaConfig.sendVersion = _newVersion;
        // the libraryLookup[BLOCK_VERSION || DEFAULT_VERSION] = 0x0
        uaConfig.sendLibrary = libraryLookup[_newVersion];
        emit UaSendVersionSet(msg.sender, _newVersion);
    }
    // Migration step 2: set the receive version
    // after all messages sent from the old version are received
    // the UA can now safely switch to the new receive version
    // it is the UA's responsibility make sure all messages from the old version are processed
    function setReceiveVersion(uint16 _newVersion) external override validVersion(_newVersion) {
        // write into config
        LibraryConfig storage uaConfig = uaConfigLookup[msg.sender];
        uaConfig.receiveVersion = _newVersion;
        // the libraryLookup[BLOCK_VERSION || DEFAULT_VERSION] = 0x0
        uaConfig.receiveLibraryAddress = address(libraryLookup[_newVersion]);
        emit UaReceiveVersionSet(msg.sender, _newVersion);
    }
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external override {
        StoredPayload storage sp = storedPayload[_srcChainId][_srcAddress];
        // revert if no messages are cached. safeguard malicious UA behaviour
        require(sp.payloadHash != bytes32(0), "LayerZero: no stored payload");
        require(sp.dstAddress == msg.sender, "LayerZero: invalid caller");
        // empty the storedPayload
        sp.payloadLength = 0;
        sp.dstAddress = address(0);
        sp.payloadHash = bytes32(0);
        // emit the event with the new nonce
        emit UaForceResumeReceive(_srcChainId, _srcAddress);
    }
    //---------------------------------------------------------------------------
    // view helper function
    function estimateFees(uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParams) external view override returns (uint nativeFee, uint zroFee) {
        LibraryConfig storage uaConfig = uaConfigLookup[_userApplication];
        ILayerZeroMessagingLibrary lib = uaConfig.sendVersion == DEFAULT_VERSION ? defaultSendLibrary : uaConfig.sendLibrary;
        return lib.estimateFees(_dstChainId, _userApplication, _payload, _payInZRO, _adapterParams);
    }
    function _getSendLibrary(LibraryConfig storage uaConfig) internal view returns (ILayerZeroMessagingLibrary) {
        if (uaConfig.sendVersion == DEFAULT_VERSION) {
            // check if the in send-blocking upgrade
            require(defaultSendVersion != BLOCK_VERSION, "LayerZero: default in BLOCK_VERSION");
            return defaultSendLibrary;
        } else {
            // check if the in send-blocking upgrade
            require(uaConfig.sendVersion != BLOCK_VERSION, "LayerZero: in BLOCK_VERSION");
            return uaConfig.sendLibrary;
        }
    }
    function getSendLibraryAddress(address _userApplication) external view override returns (address sendLibraryAddress) {
        LibraryConfig storage uaConfig = uaConfigLookup[_userApplication];
        uint16 sendVersion = uaConfig.sendVersion;
        require(sendVersion != BLOCK_VERSION, "LayerZero: send version is BLOCK_VERSION");
        if (sendVersion == DEFAULT_VERSION) {
            require(defaultSendVersion != BLOCK_VERSION, "LayerZero: send version (default) is BLOCK_VERSION");
            sendLibraryAddress = address(defaultSendLibrary);
        } else {
            sendLibraryAddress = address(uaConfig.sendLibrary);
        }
    }
    function getReceiveLibraryAddress(address _userApplication) external view override returns (address receiveLibraryAddress) {
        LibraryConfig storage uaConfig = uaConfigLookup[_userApplication];
        uint16 receiveVersion = uaConfig.receiveVersion;
        require(receiveVersion != BLOCK_VERSION, "LayerZero: receive version is BLOCK_VERSION");
        if (receiveVersion == DEFAULT_VERSION) {
            require(defaultReceiveVersion != BLOCK_VERSION, "LayerZero: receive version (default) is BLOCK_VERSION");
            receiveLibraryAddress = defaultReceiveLibraryAddress;
        } else {
            receiveLibraryAddress = uaConfig.receiveLibraryAddress;
        }
    }
    function isSendingPayload() external view override returns (bool) {
        return _send_entered_state == _ENTERED;
    }
    function isReceivingPayload() external view override returns (bool) {
        return _receive_entered_state == _ENTERED;
    }
    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view override returns (uint64) {
        return inboundNonce[_srcChainId][_srcAddress];
    }
    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view override returns (uint64) {
        return outboundNonce[_dstChainId][_srcAddress];
    }
    function getChainId() external view override returns (uint16) {
        return chainId;
    }
    function getSendVersion(address _userApplication) external view override returns (uint16) {
        LibraryConfig storage uaConfig = uaConfigLookup[_userApplication];
        return uaConfig.sendVersion == DEFAULT_VERSION ? defaultSendVersion : uaConfig.sendVersion;
    }
    function getReceiveVersion(address _userApplication) external view override returns (uint16) {
        LibraryConfig storage uaConfig = uaConfigLookup[_userApplication];
        return uaConfig.receiveVersion == DEFAULT_VERSION ? defaultReceiveVersion : uaConfig.receiveVersion;
    }
    function getConfig(uint16 _version, uint16 _chainId, address _userApplication, uint _configType) external view override validVersion(_version) returns (bytes memory) {
        if (_version == DEFAULT_VERSION) {
            require(defaultSendVersion == defaultReceiveVersion, "LayerZero: no DEFAULT config while migration");
            _version = defaultSendVersion;
        }
        require(_version != BLOCK_VERSION, "LayerZero: can not get config for BLOCK_VERSION");
        return libraryLookup[_version].getConfig(_chainId, _userApplication, _configType);
    }
    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view override returns (bool) {
        StoredPayload storage sp = storedPayload[_srcChainId][_srcAddress];
        return sp.payloadHash != bytes32(0);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroReceiver {
    // @notice LayerZero endpoint will invoke this function to deliver the message on the destination
    // @param _srcChainId - the source endpoint identifier
    // @param _srcAddress - the source sending contract address from the source chain
    // @param _nonce - the ordered message nonce
    // @param _payload - the signed payload is the UA bytes has encoded to be sent
    function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) external;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
import "./ILayerZeroUserApplicationConfig.sol";
interface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {
    // @notice send a LayerZero message to the specified address at a LayerZero endpoint.
    // @param _dstChainId - the destination chain identifier
    // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains
    // @param _payload - a custom bytes payload to send to the destination contract
    // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address
    // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction
    // @param _adapterParams - parameters for custom functionality. e.g. receive airdropped native gas from the relayer on destination
    function send(uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;
    // @notice used by the messaging library to publish verified payload
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source contract (as bytes) at the source chain
    // @param _dstAddress - the address on destination chain
    // @param _nonce - the unbound message ordering nonce
    // @param _gasLimit - the gas limit for external contract execution
    // @param _payload - verified payload to send to the destination contract
    function receivePayload(uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload) external;
    // @notice get the inboundNonce of a receiver from a source chain which could be EVM or non-EVM chain
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64);
    // @notice get the outboundNonce from this source chain which, consequently, is always an EVM
    // @param _srcAddress - the source chain contract address
    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64);
    // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery
    // @param _dstChainId - the destination chain identifier
    // @param _userApplication - the user app address on this EVM chain
    // @param _payload - the custom message to send over LayerZero
    // @param _payInZRO - if false, user app pays the protocol fee in native token
    // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain
    function estimateFees(uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);
    // @notice get this Endpoint's immutable source identifier
    function getChainId() external view returns (uint16);
    // @notice the interface to retry failed message on this Endpoint destination
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    // @param _payload - the payload to be retried
    function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external;
    // @notice query if any STORED payload (message blocking) at the endpoint.
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool);
    // @notice query if the _libraryAddress is valid for sending msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getSendLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the _libraryAddress is valid for receiving msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getReceiveLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the non-reentrancy guard for send() is on
    // @return true if the guard is on. false otherwise
    function isSendingPayload() external view returns (bool);
    // @notice query if the non-reentrancy guard for receive() is on
    // @return true if the guard is on. false otherwise
    function isReceivingPayload() external view returns (bool);
    // @notice get the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _userApplication - the contract address of the user application
    // @param _configType - type of configuration. every messaging library has its own convention.
    function getConfig(uint16 _version, uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);
    // @notice get the send() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getSendVersion(address _userApplication) external view returns (uint16);
    // @notice get the lzReceive() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getReceiveVersion(address _userApplication) external view returns (uint16);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.7.0;
import "./ILayerZeroUserApplicationConfig.sol";
interface ILayerZeroMessagingLibrary {
    // send(), messages will be inflight.
    function send(address _userApplication, uint64 _lastNonce, uint16 _chainId, bytes calldata _destination, bytes calldata _payload, address payable refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;
    // estimate native fee at the send side
    function estimateFees(uint16 _chainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);
    //---------------------------------------------------------------------------
    // setConfig / getConfig are User Application (UA) functions to specify Oracle, Relayer, blockConfirmations, libraryVersion
    function setConfig(uint16 _chainId, address _userApplication, uint _configType, bytes calldata _config) external;
    function getConfig(uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroUserApplicationConfig {
    // @notice set the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _configType - type of configuration. every messaging library has its own convention.
    // @param _config - configuration in the bytes. can encode arbitrary content.
    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external;
    // @notice set the send() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setSendVersion(uint16 _version) external;
    // @notice set the lzReceive() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setReceiveVersion(uint16 _version) external;
    // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload
    // @param _srcChainId - the chainId of the source chain
    // @param _srcAddress - the contract address of the source contract at the source chain
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external;
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

{"Address.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary Address {\n    /**\n     * @dev Returns true if `account` is a contract.\n     *\n     * [IMPORTANT]\n     * ====\n     * It is unsafe to assume that an address for which this function returns\n     * false is an externally-owned account (EOA) and not a contract.\n     *\n     * Among others, `isContract` will return false for the following\n     * types of addresses:\n     *\n     *  - an externally-owned account\n     *  - a contract in construction\n     *  - an address where a contract will be created\n     *  - an address where a contract lived, but was destroyed\n     * ====\n     */\n    function isContract(address account) internal view returns (bool) {\n        // This method relies on extcodesize, which returns 0 for contracts in\n        // construction, since the code is only stored at the end of the\n        // constructor execution.\n\n        uint256 size;\n        // solhint-disable-next-line no-inline-assembly\n        assembly { size := extcodesize(account) }\n        return size \u003e 0;\n    }\n\n    /**\n     * @dev Replacement for Solidity\u0027s `transfer`: sends `amount` wei to\n     * `recipient`, forwarding all available gas and reverting on errors.\n     *\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\n     * imposed by `transfer`, making them unable to receive funds via\n     * `transfer`. {sendValue} removes this limitation.\n     *\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n     *\n     * IMPORTANT: because control is transferred to `recipient`, care must be\n     * taken to not create reentrancy vulnerabilities. Consider using\n     * {ReentrancyGuard} or the\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n     */\n    function sendValue(address payable recipient, uint256 amount) internal {\n        require(address(this).balance \u003e= amount, \"Address: insufficient balance\");\n\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\n        (bool success, ) = recipient.call{ value: amount }(\"\");\n        require(success, \"Address: unable to send value, recipient may have reverted\");\n    }\n\n    /**\n     * @dev Performs a Solidity function call using a low level `call`. A\n     * plain`call` is an unsafe replacement for a function call: use this\n     * function instead.\n     *\n     * If `target` reverts with a revert reason, it is bubbled up by this\n     * function (like regular Solidity function calls).\n     *\n     * Returns the raw returned data. To convert to the expected return value,\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n     *\n     * Requirements:\n     *\n     * - `target` must be a contract.\n     * - calling `target` with `data` must not revert.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(address target, bytes memory data) internal returns (bytes memory) {\n      return functionCall(target, data, \"Address: low-level call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n     * `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, 0, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but also transferring `value` wei to `target`.\n     *\n     * Requirements:\n     *\n     * - the calling contract must have an ETH balance of at least `value`.\n     * - the called Solidity function must be `payable`.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {\n        require(address(this).balance \u003e= value, \"Address: insufficient balance for call\");\n        require(isContract(target), \"Address: call to non-contract\");\n\n        // solhint-disable-next-line avoid-low-level-calls\n        (bool success, bytes memory returndata) = target.call{ value: value }(data);\n        return _verifyCallResult(success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {\n        return functionStaticCall(target, data, \"Address: low-level static call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {\n        require(isContract(target), \"Address: static call to non-contract\");\n\n        // solhint-disable-next-line avoid-low-level-calls\n        (bool success, bytes memory returndata) = target.staticcall(data);\n        return _verifyCallResult(success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\n        return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\n        require(isContract(target), \"Address: delegate call to non-contract\");\n\n        // solhint-disable-next-line avoid-low-level-calls\n        (bool success, bytes memory returndata) = target.delegatecall(data);\n        return _verifyCallResult(success, returndata, errorMessage);\n    }\n\n    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {\n        if (success) {\n            return returndata;\n        } else {\n            // Look for revert reason and bubble it up if present\n            if (returndata.length \u003e 0) {\n                // The easiest way to bubble the revert reason is using memory via assembly\n\n                // solhint-disable-next-line no-inline-assembly\n                assembly {\n                    let returndata_size := mload(returndata)\n                    revert(add(32, returndata), returndata_size)\n                }\n            } else {\n                revert(errorMessage);\n            }\n        }\n    }\n}\n"},"Buffer.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\n// https://github.com/ensdomains/buffer\n\npragma solidity ^0.7.0;\n\n/**\n * @dev A library for working with mutable byte buffers in Solidity.\n *\n * Byte buffers are mutable and expandable, and provide a variety of primitives\n * for writing to them. At any time you can fetch a bytes object containing the\n * current contents of the buffer. The bytes object should not be stored between\n * operations, as it may change due to resizing of the buffer.\n */\nlibrary Buffer {\n    /**\n     * @dev Represents a mutable buffer. Buffers have a current value (buf) and\n     *      a capacity. The capacity may be longer than the current value, in\n     *      which case it can be extended without the need to allocate more memory.\n     */\n    struct buffer {\n        bytes buf;\n        uint capacity;\n    }\n\n    /**\n     * @dev Initializes a buffer with an initial capacity.a co\n     * @param buf The buffer to initialize.\n     * @param capacity The number of bytes of space to allocate the buffer.\n     * @return The buffer, for chaining.\n     */\n    function init(buffer memory buf, uint capacity) internal pure returns (buffer memory) {\n        if (capacity % 32 != 0) {\n            capacity += 32 - (capacity % 32);\n        }\n        // Allocate space for the buffer data\n        buf.capacity = capacity;\n        assembly {\n            let ptr := mload(0x40)\n            mstore(buf, ptr)\n            mstore(ptr, 0)\n            mstore(0x40, add(32, add(ptr, capacity)))\n        }\n        return buf;\n    }\n\n\n    /**\n     * @dev Writes a byte string to a buffer. Resizes if doing so would exceed\n     *      the capacity of the buffer.\n     * @param buf The buffer to append to.\n     * @param off The start offset to write to.\n     * @param rawData The data to append.\n     * @param len The number of bytes to copy.\n     * @return The original buffer, for chaining.\n     */\n    function writeRawBytes(\n        buffer memory buf,\n        uint off,\n        bytes memory rawData,\n        uint offData,\n        uint len\n    ) internal pure returns (buffer memory) {\n        if (off + len \u003e buf.capacity) {\n            resize(buf, max(buf.capacity, len + off) * 2);\n        }\n\n        uint dest;\n        uint src;\n        assembly {\n            // Memory address of the buffer data\n            let bufptr := mload(buf)\n            // Length of existing buffer data\n            let buflen := mload(bufptr)\n            // Start address = buffer address + offset + sizeof(buffer length)\n            dest := add(add(bufptr, 32), off)\n            // Update buffer length if we\u0027re extending it\n            if gt(add(len, off), buflen) {\n                mstore(bufptr, add(len, off))\n            }\n            src := add(rawData, offData)\n        }\n\n        // Copy word-length chunks while possible\n        for (; len \u003e= 32; len -= 32) {\n            assembly {\n                mstore(dest, mload(src))\n            }\n            dest += 32;\n            src += 32;\n        }\n\n        // Copy remaining bytes\n        uint mask = 256**(32 - len) - 1;\n        assembly {\n            let srcpart := and(mload(src), not(mask))\n            let destpart := and(mload(dest), mask)\n            mstore(dest, or(destpart, srcpart))\n        }\n\n        return buf;\n    }\n\n    /**\n     * @dev Writes a byte string to a buffer. Resizes if doing so would exceed\n     *      the capacity of the buffer.\n     * @param buf The buffer to append to.\n     * @param off The start offset to write to.\n     * @param data The data to append.\n     * @param len The number of bytes to copy.\n     * @return The original buffer, for chaining.\n     */\n    function write(buffer memory buf, uint off, bytes memory data, uint len) internal pure returns (buffer memory) {\n        require(len \u003c= data.length);\n\n        if (off + len \u003e buf.capacity) {\n            resize(buf, max(buf.capacity, len + off) * 2);\n        }\n\n        uint dest;\n        uint src;\n        assembly {\n        // Memory address of the buffer data\n            let bufptr := mload(buf)\n        // Length of existing buffer data\n            let buflen := mload(bufptr)\n        // Start address = buffer address + offset + sizeof(buffer length)\n            dest := add(add(bufptr, 32), off)\n        // Update buffer length if we\u0027re extending it\n            if gt(add(len, off), buflen) {\n                mstore(bufptr, add(len, off))\n            }\n            src := add(data, 32)\n        }\n\n        // Copy word-length chunks while possible\n        for (; len \u003e= 32; len -= 32) {\n            assembly {\n                mstore(dest, mload(src))\n            }\n            dest += 32;\n            src += 32;\n        }\n\n        // Copy remaining bytes\n        uint mask = 256**(32 - len) - 1;\n        assembly {\n            let srcpart := and(mload(src), not(mask))\n            let destpart := and(mload(dest), mask)\n            mstore(dest, or(destpart, srcpart))\n        }\n\n        return buf;\n    }\n\n    function append(buffer memory buf, bytes memory data) internal pure returns (buffer memory) {\n        return write(buf, buf.buf.length, data, data.length);\n    }\n\n    function resize(buffer memory buf, uint capacity) private pure {\n        bytes memory oldbuf = buf.buf;\n        init(buf, capacity);\n        append(buf, oldbuf);\n    }\n\n    function max(uint a, uint b) private pure returns (uint) {\n        if (a \u003e b) {\n            return a;\n        }\n        return b;\n    }\n}\n"},"Context.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity \u003e=0.6.0 \u003c0.8.0;\n\n/*\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with GSN meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n    function _msgSender() internal view virtual returns (address payable) {\n        return msg.sender;\n    }\n\n    function _msgData() internal view virtual returns (bytes memory) {\n        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691\n        return msg.data;\n    }\n}\n"},"IERC20.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n    /**\n     * @dev Returns the amount of tokens in existence.\n     */\n    function totalSupply() external view returns (uint256);\n\n    /**\n     * @dev Returns the amount of tokens owned by `account`.\n     */\n    function balanceOf(address account) external view returns (uint256);\n\n    /**\n     * @dev Moves `amount` tokens from the caller\u0027s account to `recipient`.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transfer(address recipient, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Returns the remaining number of tokens that `spender` will be\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\n     * zero by default.\n     *\n     * This value changes when {approve} or {transferFrom} are called.\n     */\n    function allowance(address owner, address spender) external view returns (uint256);\n\n    /**\n     * @dev Sets `amount` as the allowance of `spender` over the caller\u0027s tokens.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\n     * that someone may use both the old and the new allowance by unfortunate\n     * transaction ordering. One possible solution to mitigate this race\n     * condition is to first reduce the spender\u0027s allowance to 0 and set the\n     * desired value afterwards:\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n     *\n     * Emits an {Approval} event.\n     */\n    function approve(address spender, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\n     * allowance mechanism. `amount` is then deducted from the caller\u0027s\n     * allowance.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\n     * another (`to`).\n     *\n     * Note that `value` may be zero.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    /**\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n     * a call to {approve}. `value` is the new allowance.\n     */\n    event Approval(address indexed owner, address indexed spender, uint256 value);\n}\n"},"ILayerZeroEndpoint.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.5.0;\n\nimport \"./ILayerZeroUserApplicationConfig.sol\";\n\ninterface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {\n    // @notice send a LayerZero message to the specified address at a LayerZero endpoint.\n    // @param _dstChainId - the destination chain identifier\n    // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains\n    // @param _payload - a custom bytes payload to send to the destination contract\n    // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address\n    // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction\n    // @param _adapterParams - parameters for custom functionality. e.g. receive airdropped native gas from the relayer on destination\n    function send(uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;\n\n    // @notice used by the messaging library to publish verified payload\n    // @param _srcChainId - the source chain identifier\n    // @param _srcAddress - the source contract (as bytes) at the source chain\n    // @param _dstAddress - the address on destination chain\n    // @param _nonce - the unbound message ordering nonce\n    // @param _gasLimit - the gas limit for external contract execution\n    // @param _payload - verified payload to send to the destination contract\n    function receivePayload(uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload) external;\n\n    // @notice get the inboundNonce of a receiver from a source chain which could be EVM or non-EVM chain\n    // @param _srcChainId - the source chain identifier\n    // @param _srcAddress - the source chain contract address\n    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64);\n\n    // @notice get the outboundNonce from this source chain which, consequently, is always an EVM\n    // @param _srcAddress - the source chain contract address\n    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64);\n\n    // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery\n    // @param _dstChainId - the destination chain identifier\n    // @param _userApplication - the user app address on this EVM chain\n    // @param _payload - the custom message to send over LayerZero\n    // @param _payInZRO - if false, user app pays the protocol fee in native token\n    // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain\n    function estimateFees(uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);\n\n    // @notice get this Endpoint\u0027s immutable source identifier\n    function getChainId() external view returns (uint16);\n\n    // @notice the interface to retry failed message on this Endpoint destination\n    // @param _srcChainId - the source chain identifier\n    // @param _srcAddress - the source chain contract address\n    // @param _payload - the payload to be retried\n    function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external;\n\n    // @notice query if any STORED payload (message blocking) at the endpoint.\n    // @param _srcChainId - the source chain identifier\n    // @param _srcAddress - the source chain contract address\n    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool);\n\n    // @notice query if the _libraryAddress is valid for sending msgs.\n    // @param _userApplication - the user app address on this EVM chain\n    function getSendLibraryAddress(address _userApplication) external view returns (address);\n\n    // @notice query if the _libraryAddress is valid for receiving msgs.\n    // @param _userApplication - the user app address on this EVM chain\n    function getReceiveLibraryAddress(address _userApplication) external view returns (address);\n\n    // @notice query if the non-reentrancy guard for send() is on\n    // @return true if the guard is on. false otherwise\n    function isSendingPayload() external view returns (bool);\n\n    // @notice query if the non-reentrancy guard for receive() is on\n    // @return true if the guard is on. false otherwise\n    function isReceivingPayload() external view returns (bool);\n\n    // @notice get the configuration of the LayerZero messaging library of the specified version\n    // @param _version - messaging library version\n    // @param _chainId - the chainId for the pending config change\n    // @param _userApplication - the contract address of the user application\n    // @param _configType - type of configuration. every messaging library has its own convention.\n    function getConfig(uint16 _version, uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);\n\n    // @notice get the send() LayerZero messaging library version\n    // @param _userApplication - the contract address of the user application\n    function getSendVersion(address _userApplication) external view returns (uint16);\n\n    // @notice get the lzReceive() LayerZero messaging library version\n    // @param _userApplication - the contract address of the user application\n    function getReceiveVersion(address _userApplication) external view returns (uint16);\n}\n"},"ILayerZeroMessagingLibrary.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.7.0;\n\nimport \"./ILayerZeroUserApplicationConfig.sol\";\n\ninterface ILayerZeroMessagingLibrary {\n    // send(), messages will be inflight.\n    function send(address _userApplication, uint64 _lastNonce, uint16 _chainId, bytes calldata _destination, bytes calldata _payload, address payable refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;\n\n    // estimate native fee at the send side\n    function estimateFees(uint16 _chainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);\n\n    //---------------------------------------------------------------------------\n    // setConfig / getConfig are User Application (UA) functions to specify Oracle, Relayer, blockConfirmations, libraryVersion\n    function setConfig(uint16 _chainId, address _userApplication, uint _configType, bytes calldata _config) external;\n\n    function getConfig(uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);\n}\n"},"ILayerZeroMessagingLibraryV2.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.7.0;\n\nimport \"./ILayerZeroUserApplicationConfig.sol\";\nimport \"./ILayerZeroMessagingLibrary.sol\";\n\ninterface ILayerZeroMessagingLibraryV2 is ILayerZeroMessagingLibrary {\n    function getOutboundNonce(uint16 _chainId, bytes calldata _path) external view returns (uint64);\n}\n"},"ILayerZeroOracleV2.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.7.0;\n\ninterface ILayerZeroOracleV2 {\n    // @notice query price and assign jobs at the same time\n    // @param _dstChainId - the destination endpoint identifier\n    // @param _outboundProofType - the proof type identifier to specify proof to be relayed\n    // @param _outboundBlockConfirmation - block confirmation delay before relaying blocks\n    // @param _userApplication - the source sending contract address\n    function assignJob(uint16 _dstChainId, uint16 _outboundProofType, uint64 _outboundBlockConfirmation, address _userApplication) external returns (uint price);\n\n    // @notice query the oracle price for relaying block information to the destination chain\n    // @param _dstChainId the destination endpoint identifier\n    // @param _outboundProofType the proof type identifier to specify the data to be relayed\n    // @param _outboundBlockConfirmation - block confirmation delay before relaying blocks\n    // @param _userApplication - the source sending contract address\n    function getFee(uint16 _dstChainId, uint16 _outboundProofType, uint64 _outboundBlockConfirmation, address _userApplication) external view returns (uint price);\n\n    // @notice withdraw the accrued fee in ultra light node\n    // @param _to - the fee receiver\n    // @param _amount - the withdrawal amount\n    function withdrawFee(address payable _to, uint _amount) external;\n}\n"},"ILayerZeroReceiver.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.5.0;\n\ninterface ILayerZeroReceiver {\n    // @notice LayerZero endpoint will invoke this function to deliver the message on the destination\n    // @param _srcChainId - the source endpoint identifier\n    // @param _srcAddress - the source sending contract address from the source chain\n    // @param _nonce - the ordered message nonce\n    // @param _payload - the signed payload is the UA bytes has encoded to be sent\n    function lzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) external;\n}\n"},"ILayerZeroRelayerV2.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.7.0;\n\ninterface ILayerZeroRelayerV2 {\n    // @notice query price and assign jobs at the same time\n    // @param _dstChainId - the destination endpoint identifier\n    // @param _outboundProofType - the proof type identifier to specify proof to be relayed\n    // @param _userApplication - the source sending contract address. relayers may apply price discrimination to user apps\n    // @param _payloadSize - the length of the payload. it is an indicator of gas usage for relaying cross-chain messages\n    // @param _adapterParams - optional parameters for extra service plugins, e.g. sending dust tokens at the destination chain\n    function assignJob(uint16 _dstChainId, uint16 _outboundProofType, address _userApplication, uint _payloadSize, bytes calldata _adapterParams) external returns (uint price);\n\n    // @notice query the relayer price for relaying the payload and its proof to the destination chain\n    // @param _dstChainId - the destination endpoint identifier\n    // @param _outboundProofType - the proof type identifier to specify proof to be relayed\n    // @param _userApplication - the source sending contract address. relayers may apply price discrimination to user apps\n    // @param _payloadSize - the length of the payload. it is an indicator of gas usage for relaying cross-chain messages\n    // @param _adapterParams - optional parameters for extra service plugins, e.g. sending dust tokens at the destination chain\n    function getFee(uint16 _dstChainId, uint16 _outboundProofType, address _userApplication, uint _payloadSize, bytes calldata _adapterParams) external view returns (uint price);\n\n    // @notice withdraw the accrued fee in ultra light node\n    // @param _to - the fee receiver\n    // @param _amount - the withdrawal amount\n    function withdrawFee(address payable _to, uint _amount) external;\n}\n"},"ILayerZeroTreasury.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.5.0;\n\ninterface ILayerZeroTreasury {\n    function getFees(bool payInZro, uint relayerFee, uint oracleFee) external view returns (uint);\n}\n"},"ILayerZeroUltraLightNodeV2.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.7.0;\npragma abicoder v2;\n\ninterface ILayerZeroUltraLightNodeV2 {\n    // Relayer functions\n    function validateTransactionProof(uint16 _srcChainId, address _dstAddress, uint _gasLimit, bytes32 _lookupHash, bytes32 _blockData, bytes calldata _transactionProof) external;\n\n    // an Oracle delivers the block data using updateHash()\n    function updateHash(uint16 _srcChainId, bytes32 _lookupHash, uint _confirmations, bytes32 _blockData) external;\n\n    // can only withdraw the receivable of the msg.sender\n    function withdrawNative(address payable _to, uint _amount) external;\n\n    function withdrawZRO(address _to, uint _amount) external;\n\n    // view functions\n    function getAppConfig(uint16 _remoteChainId, address _userApplicationAddress) external view returns (ApplicationConfiguration memory);\n\n    function accruedNativeFee(address _address) external view returns (uint);\n\n    struct ApplicationConfiguration {\n        uint16 inboundProofLibraryVersion;\n        uint64 inboundBlockConfirmations;\n        address relayer;\n        uint16 outboundProofType;\n        uint64 outboundBlockConfirmations;\n        address oracle;\n    }\n\n    event HashReceived(uint16 indexed srcChainId, address indexed oracle, bytes32 lookupHash, bytes32 blockData, uint confirmations);\n    event RelayerParams(bytes adapterParams, uint16 outboundProofType);\n    event Packet(bytes payload);\n    event InvalidDst(uint16 indexed srcChainId, bytes srcAddress, address indexed dstAddress, uint64 nonce, bytes32 payloadHash);\n    event PacketReceived(uint16 indexed srcChainId, bytes srcAddress, address indexed dstAddress, uint64 nonce, bytes32 payloadHash);\n    event AppConfigUpdated(address indexed userApplication, uint indexed configType, bytes newConfig);\n    event AddInboundProofLibraryForChain(uint16 indexed chainId, address lib);\n    event EnableSupportedOutboundProof(uint16 indexed chainId, uint16 proofType);\n    event SetChainAddressSize(uint16 indexed chainId, uint size);\n    event SetDefaultConfigForChainId(uint16 indexed chainId, uint16 inboundProofLib, uint64 inboundBlockConfirm, address relayer, uint16 outboundProofType, uint64 outboundBlockConfirm, address oracle);\n    event SetDefaultAdapterParamsForChainId(uint16 indexed chainId, uint16 indexed proofType, bytes adapterParams);\n    event SetLayerZeroToken(address indexed tokenAddress);\n    event SetRemoteUln(uint16 indexed chainId, bytes32 uln);\n    event SetTreasury(address indexed treasuryAddress);\n    event WithdrawZRO(address indexed msgSender, address indexed to, uint amount);\n    event WithdrawNative(address indexed msgSender, address indexed to, uint amount);\n}\n"},"ILayerZeroUserApplicationConfig.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.5.0;\n\ninterface ILayerZeroUserApplicationConfig {\n    // @notice set the configuration of the LayerZero messaging library of the specified version\n    // @param _version - messaging library version\n    // @param _chainId - the chainId for the pending config change\n    // @param _configType - type of configuration. every messaging library has its own convention.\n    // @param _config - configuration in the bytes. can encode arbitrary content.\n    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external;\n\n    // @notice set the send() LayerZero messaging library version to _version\n    // @param _version - new messaging library version\n    function setSendVersion(uint16 _version) external;\n\n    // @notice set the lzReceive() LayerZero messaging library version to _version\n    // @param _version - new messaging library version\n    function setReceiveVersion(uint16 _version) external;\n\n    // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload\n    // @param _srcChainId - the chainId of the source chain\n    // @param _srcAddress - the contract address of the source contract at the source chain\n    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external;\n}\n"},"ILayerZeroValidationLibrary.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity \u003e=0.7.0;\npragma abicoder v2;\n\nimport \"./LayerZeroPacket.sol\";\n\ninterface ILayerZeroValidationLibrary {\n    function validateProof(bytes32 blockData, bytes calldata _data, uint _remoteAddressSize) external returns (LayerZeroPacket.Packet memory packet);\n}\n"},"LayerZeroPacket.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity 0.7.6;\n\nimport \"./Buffer.sol\";\nimport \"./SafeMath.sol\";\n\nlibrary LayerZeroPacket {\n    using Buffer for Buffer.buffer;\n    using SafeMath for uint;\n\n    struct Packet {\n        uint16 srcChainId;\n        uint16 dstChainId;\n        uint64 nonce;\n        address dstAddress;\n        bytes srcAddress;\n        bytes32 ulnAddress;\n        bytes payload;\n    }\n\n    function getPacket(\n        bytes memory data,\n        uint16 srcChain,\n        uint sizeOfSrcAddress,\n        bytes32 ulnAddress\n    ) internal pure returns (LayerZeroPacket.Packet memory) {\n        uint16 dstChainId;\n        address dstAddress;\n        uint size;\n        uint64 nonce;\n\n        // The log consists of the destination chain id and then a bytes payload\n        //      0--------------------------------------------31\n        // 0   |  total bytes size\n        // 32  |  destination chain id\n        // 64  |  bytes offset\n        // 96  |  bytes array size\n        // 128 |  payload\n        assembly {\n            dstChainId := mload(add(data, 32))\n            size := mload(add(data, 96)) /// size of the byte array\n            nonce := mload(add(data, 104)) // offset to convert to uint64  128  is index -24\n            dstAddress := mload(add(data, sub(add(128, sizeOfSrcAddress), 4))) // offset to convert to address 12 -8\n        }\n\n        Buffer.buffer memory srcAddressBuffer;\n        srcAddressBuffer.init(sizeOfSrcAddress);\n        srcAddressBuffer.writeRawBytes(0, data, 136, sizeOfSrcAddress); // 128 + 8\n\n        uint payloadSize = size.sub(28).sub(sizeOfSrcAddress);\n        Buffer.buffer memory payloadBuffer;\n        payloadBuffer.init(payloadSize);\n        payloadBuffer.writeRawBytes(0, data, sizeOfSrcAddress.add(156), payloadSize); // 148 + 8\n        return LayerZeroPacket.Packet(srcChain, dstChainId, nonce, dstAddress, srcAddressBuffer.buf, ulnAddress, payloadBuffer.buf);\n    }\n\n    function getPacketV2(\n        bytes memory data,\n        uint sizeOfSrcAddress,\n        bytes32 ulnAddress\n    ) internal pure returns (LayerZeroPacket.Packet memory) {\n        // packet def: abi.encodePacked(nonce, srcChain, srcAddress, dstChain, dstAddress, payload);\n        // data def: abi.encode(packet) = offset(32) + length(32) + packet\n        //              if from EVM\n        // 0 - 31       0 - 31          |  total bytes size\n        // 32 - 63      32 - 63         |  location\n        // 64 - 95      64 - 95         |  size of the packet\n        // 96 - 103     96 - 103        |  nonce\n        // 104 - 105    104 - 105       |  srcChainId\n        // 106 - P      106 - 125       |  srcAddress, where P = 106 + sizeOfSrcAddress - 1,\n        // P+1 - P+2    126 - 127       |  dstChainId\n        // P+3 - P+22   128 - 147       |  dstAddress\n        // P+23 - END   148 - END       |  payload\n\n        // decode the packet\n        uint256 realSize;\n        uint64 nonce;\n        uint16 srcChain;\n        uint16 dstChain;\n        address dstAddress;\n        assembly {\n            realSize := mload(add(data, 64))\n            nonce := mload(add(data, 72)) // 104 - 32\n            srcChain := mload(add(data, 74)) // 106 - 32\n            dstChain := mload(add(data, add(76, sizeOfSrcAddress))) // P + 3 - 32 = 105 + size + 3 - 32 = 76 + size\n            dstAddress := mload(add(data, add(96, sizeOfSrcAddress))) // P + 23 - 32 = 105 + size + 23 - 32 = 96 + size\n        }\n\n        require(srcChain != 0, \"LayerZeroPacket: invalid packet\");\n\n        Buffer.buffer memory srcAddressBuffer;\n        srcAddressBuffer.init(sizeOfSrcAddress);\n        srcAddressBuffer.writeRawBytes(0, data, 106, sizeOfSrcAddress);\n\n        uint nonPayloadSize = sizeOfSrcAddress.add(32);// 2 + 2 + 8 + 20, 32 + 20 = 52 if sizeOfSrcAddress == 20\n        uint payloadSize = realSize.sub(nonPayloadSize);\n        Buffer.buffer memory payloadBuffer;\n        payloadBuffer.init(payloadSize);\n        payloadBuffer.writeRawBytes(0, data, nonPayloadSize.add(96), payloadSize);\n\n        return LayerZeroPacket.Packet(srcChain, dstChain, nonce, dstAddress, srcAddressBuffer.buf, ulnAddress, payloadBuffer.buf);\n    }\n\n    function getPacketV3(\n        bytes memory data,\n        uint sizeOfSrcAddress,\n        bytes32 ulnAddress\n    ) internal pure returns (LayerZeroPacket.Packet memory) {\n        // data def: abi.encodePacked(nonce, srcChain, srcAddress, dstChain, dstAddress, payload);\n        //              if from EVM\n        // 0 - 31       0 - 31          |  total bytes size\n        // 32 - 39      32 - 39         |  nonce\n        // 40 - 41      40 - 41         |  srcChainId\n        // 42 - P       42 - 61         |  srcAddress, where P = 41 + sizeOfSrcAddress,\n        // P+1 - P+2    62 - 63         |  dstChainId\n        // P+3 - P+22   64 - 83         |  dstAddress\n        // P+23 - END   84 - END        |  payload\n\n        // decode the packet\n        uint256 realSize = data.length;\n        uint nonPayloadSize = sizeOfSrcAddress.add(32);// 2 + 2 + 8 + 20, 32 + 20 = 52 if sizeOfSrcAddress == 20\n        require(realSize \u003e= nonPayloadSize, \"LayerZeroPacket: invalid packet\");\n        uint payloadSize = realSize - nonPayloadSize;\n\n        uint64 nonce;\n        uint16 srcChain;\n        uint16 dstChain;\n        address dstAddress;\n        assembly {\n            nonce := mload(add(data, 8)) // 40 - 32\n            srcChain := mload(add(data, 10)) // 42 - 32\n            dstChain := mload(add(data, add(12, sizeOfSrcAddress))) // P + 3 - 32 = 41 + size + 3 - 32 = 12 + size\n            dstAddress := mload(add(data, add(32, sizeOfSrcAddress))) // P + 23 - 32 = 41 + size + 23 - 32 = 32 + size\n        }\n\n        require(srcChain != 0, \"LayerZeroPacket: invalid packet\");\n\n        Buffer.buffer memory srcAddressBuffer;\n        srcAddressBuffer.init(sizeOfSrcAddress);\n        srcAddressBuffer.writeRawBytes(0, data, 42, sizeOfSrcAddress);\n\n        Buffer.buffer memory payloadBuffer;\n        if (payloadSize \u003e 0) {\n            payloadBuffer.init(payloadSize);\n            payloadBuffer.writeRawBytes(0, data, nonPayloadSize.add(32), payloadSize);\n        }\n\n        return LayerZeroPacket.Packet(srcChain, dstChain, nonce, dstAddress, srcAddressBuffer.buf, ulnAddress, payloadBuffer.buf);\n    }\n}\n"},"NonceContract.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity 0.7.6;\n\nimport \"./ILayerZeroEndpoint.sol\";\n\ncontract NonceContract {\n    ILayerZeroEndpoint public immutable endpoint;\n    // outboundNonce = [dstChainId][remoteAddress + localAddress]\n    mapping(uint16 =\u003e mapping(bytes =\u003e uint64)) public outboundNonce;\n\n    constructor(address _endpoint) {\n        endpoint = ILayerZeroEndpoint(_endpoint);\n    }\n\n    function increment(uint16 _chainId, address _ua, bytes calldata _path) external returns (uint64) {\n        require(endpoint.getSendLibraryAddress(_ua) == msg.sender, \"NonceContract: msg.sender is not valid sendlibrary\");\n        return ++outboundNonce[_chainId][_path];\n    }\n}\n"},"Ownable.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"./Context.sol\";\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * By default, the owner account will be the one that deploys the contract. This\n * can later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract Ownable is Context {\n    address private _owner;\n\n    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n    /**\n     * @dev Initializes the contract setting the deployer as the initial owner.\n     */\n    constructor () {\n        address msgSender = _msgSender();\n        _owner = msgSender;\n        emit OwnershipTransferred(address(0), msgSender);\n    }\n\n    /**\n     * @dev Returns the address of the current owner.\n     */\n    function owner() public view virtual returns (address) {\n        return _owner;\n    }\n\n    /**\n     * @dev Throws if called by any account other than the owner.\n     */\n    modifier onlyOwner() {\n        require(owner() == _msgSender(), \"Ownable: caller is not the owner\");\n        _;\n    }\n\n    /**\n     * @dev Leaves the contract without owner. It will not be possible to call\n     * `onlyOwner` functions anymore. Can only be called by the current owner.\n     *\n     * NOTE: Renouncing ownership will leave the contract without an owner,\n     * thereby removing any functionality that is only available to the owner.\n     */\n    function renounceOwnership() public virtual onlyOwner {\n        emit OwnershipTransferred(_owner, address(0));\n        _owner = address(0);\n    }\n\n    /**\n     * @dev Transfers ownership of the contract to a new account (`newOwner`).\n     * Can only be called by the current owner.\n     */\n    function transferOwnership(address newOwner) public virtual onlyOwner {\n        require(newOwner != address(0), \"Ownable: new owner is the zero address\");\n        emit OwnershipTransferred(_owner, newOwner);\n        _owner = newOwner;\n    }\n}\n"},"ReentrancyGuard.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Contract module that helps prevent reentrant calls to a function.\n *\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\n * available, which can be applied to functions to make sure there are no nested\n * (reentrant) calls to them.\n *\n * Note that because there is a single `nonReentrant` guard, functions marked as\n * `nonReentrant` may not call one another. This can be worked around by making\n * those functions `private`, and then adding `external` `nonReentrant` entry\n * points to them.\n *\n * TIP: If you would like to learn more about reentrancy and alternative ways\n * to protect against it, check out our blog post\n * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\n */\nabstract contract ReentrancyGuard {\n    // Booleans are more expensive than uint256 or any type that takes up a full\n    // word because each write operation emits an extra SLOAD to first read the\n    // slot\u0027s contents, replace the bits taken up by the boolean, and then write\n    // back. This is the compiler\u0027s defense against contract upgrades and\n    // pointer aliasing, and it cannot be disabled.\n\n    // The values being non-zero value makes deployment a bit more expensive,\n    // but in exchange the refund on every call to nonReentrant will be lower in\n    // amount. Since refunds are capped to a percentage of the total\n    // transaction\u0027s gas, it is best to keep them low in cases like this one, to\n    // increase the likelihood of the full refund coming into effect.\n    uint256 private constant _NOT_ENTERED = 1;\n    uint256 private constant _ENTERED = 2;\n\n    uint256 private _status;\n\n    constructor () {\n        _status = _NOT_ENTERED;\n    }\n\n    /**\n     * @dev Prevents a contract from calling itself, directly or indirectly.\n     * Calling a `nonReentrant` function from another `nonReentrant`\n     * function is not supported. It is possible to prevent this from happening\n     * by making the `nonReentrant` function external, and make it call a\n     * `private` function that does the actual work.\n     */\n    modifier nonReentrant() {\n        // On the first call to nonReentrant, _notEntered will be true\n        require(_status != _ENTERED, \"ReentrancyGuard: reentrant call\");\n\n        // Any calls to nonReentrant after this point will fail\n        _status = _ENTERED;\n\n        _;\n\n        // By storing the original value once again, a refund is triggered (see\n        // https://eips.ethereum.org/EIPS/eip-2200)\n        _status = _NOT_ENTERED;\n    }\n}\n"},"SafeERC20.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"./IERC20.sol\";\nimport \"./SafeMath.sol\";\nimport \"./Address.sol\";\n\n/**\n * @title SafeERC20\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\n * contract returns false). Tokens that return no value (and instead revert or\n * throw on failure) are also supported, non-reverting calls are assumed to be\n * successful.\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\n */\nlibrary SafeERC20 {\n    using SafeMath for uint256;\n    using Address for address;\n\n    function safeTransfer(IERC20 token, address to, uint256 value) internal {\n        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));\n    }\n\n    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {\n        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));\n    }\n\n    /**\n     * @dev Deprecated. This function has issues similar to the ones found in\n     * {IERC20-approve}, and its usage is discouraged.\n     *\n     * Whenever possible, use {safeIncreaseAllowance} and\n     * {safeDecreaseAllowance} instead.\n     */\n    function safeApprove(IERC20 token, address spender, uint256 value) internal {\n        // safeApprove should only be called when setting an initial allowance,\n        // or when resetting it to zero. To increase and decrease it, use\n        // \u0027safeIncreaseAllowance\u0027 and \u0027safeDecreaseAllowance\u0027\n        // solhint-disable-next-line max-line-length\n        require((value == 0) || (token.allowance(address(this), spender) == 0),\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\n        );\n        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));\n    }\n\n    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {\n        uint256 newAllowance = token.allowance(address(this), spender).add(value);\n        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n    }\n\n    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {\n        uint256 newAllowance = token.allowance(address(this), spender).sub(value, \"SafeERC20: decreased allowance below zero\");\n        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n    }\n\n    /**\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\n     * @param token The token targeted by the call.\n     * @param data The call data (encoded using abi.encode or one of its variants).\n     */\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\n        // We need to perform a low level call here, to bypass Solidity\u0027s return data size checking mechanism, since\n        // we\u0027re implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\n        // the target address contains contract code and also asserts for success in the low-level call.\n\n        bytes memory returndata = address(token).functionCall(data, \"SafeERC20: low-level call failed\");\n        if (returndata.length \u003e 0) { // Return data is optional\n            // solhint-disable-next-line max-line-length\n            require(abi.decode(returndata, (bool)), \"SafeERC20: ERC20 operation did not succeed\");\n        }\n    }\n}\n"},"SafeMath.sol":{"content":"// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Wrappers over Solidity\u0027s arithmetic operations with added overflow\n * checks.\n *\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\n * in bugs, because programmers usually assume that an overflow raises an\n * error, which is the standard behavior in high level programming languages.\n * `SafeMath` restores this intuition by reverting the transaction when an\n * operation overflows.\n *\n * Using this library instead of the unchecked operations eliminates an entire\n * class of bugs, so it\u0027s recommended to use it always.\n */\nlibrary SafeMath {\n    /**\n     * @dev Returns the addition of two unsigned integers, with an overflow flag.\n     *\n     * _Available since v3.4._\n     */\n    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        uint256 c = a + b;\n        if (c \u003c a) return (false, 0);\n        return (true, c);\n    }\n\n    /**\n     * @dev Returns the substraction of two unsigned integers, with an overflow flag.\n     *\n     * _Available since v3.4._\n     */\n    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        if (b \u003e a) return (false, 0);\n        return (true, a - b);\n    }\n\n    /**\n     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.\n     *\n     * _Available since v3.4._\n     */\n    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        // Gas optimization: this is cheaper than requiring \u0027a\u0027 not being zero, but the\n        // benefit is lost if \u0027b\u0027 is also tested.\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\n        if (a == 0) return (true, 0);\n        uint256 c = a * b;\n        if (c / a != b) return (false, 0);\n        return (true, c);\n    }\n\n    /**\n     * @dev Returns the division of two unsigned integers, with a division by zero flag.\n     *\n     * _Available since v3.4._\n     */\n    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        if (b == 0) return (false, 0);\n        return (true, a / b);\n    }\n\n    /**\n     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.\n     *\n     * _Available since v3.4._\n     */\n    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        if (b == 0) return (false, 0);\n        return (true, a % b);\n    }\n\n    /**\n     * @dev Returns the addition of two unsigned integers, reverting on\n     * overflow.\n     *\n     * Counterpart to Solidity\u0027s `+` operator.\n     *\n     * Requirements:\n     *\n     * - Addition cannot overflow.\n     */\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\n        uint256 c = a + b;\n        require(c \u003e= a, \"SafeMath: addition overflow\");\n        return c;\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers, reverting on\n     * overflow (when the result is negative).\n     *\n     * Counterpart to Solidity\u0027s `-` operator.\n     *\n     * Requirements:\n     *\n     * - Subtraction cannot overflow.\n     */\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n        require(b \u003c= a, \"SafeMath: subtraction overflow\");\n        return a - b;\n    }\n\n    /**\n     * @dev Returns the multiplication of two unsigned integers, reverting on\n     * overflow.\n     *\n     * Counterpart to Solidity\u0027s `*` operator.\n     *\n     * Requirements:\n     *\n     * - Multiplication cannot overflow.\n     */\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\n        if (a == 0) return 0;\n        uint256 c = a * b;\n        require(c / a == b, \"SafeMath: multiplication overflow\");\n        return c;\n    }\n\n    /**\n     * @dev Returns the integer division of two unsigned integers, reverting on\n     * division by zero. The result is rounded towards zero.\n     *\n     * Counterpart to Solidity\u0027s `/` operator. Note: this function uses a\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\n     * uses an invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\n        require(b \u003e 0, \"SafeMath: division by zero\");\n        return a / b;\n    }\n\n    /**\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n     * reverting when dividing by zero.\n     *\n     * Counterpart to Solidity\u0027s `%` operator. This function uses a `revert`\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\n     * invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\n        require(b \u003e 0, \"SafeMath: modulo by zero\");\n        return a % b;\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\n     * overflow (when the result is negative).\n     *\n     * CAUTION: This function is deprecated because it requires allocating memory for the error\n     * message unnecessarily. For custom revert reasons use {trySub}.\n     *\n     * Counterpart to Solidity\u0027s `-` operator.\n     *\n     * Requirements:\n     *\n     * - Subtraction cannot overflow.\n     */\n    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n        require(b \u003c= a, errorMessage);\n        return a - b;\n    }\n\n    /**\n     * @dev Returns the integer division of two unsigned integers, reverting with custom message on\n     * division by zero. The result is rounded towards zero.\n     *\n     * CAUTION: This function is deprecated because it requires allocating memory for the error\n     * message unnecessarily. For custom revert reasons use {tryDiv}.\n     *\n     * Counterpart to Solidity\u0027s `/` operator. Note: this function uses a\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\n     * uses an invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n        require(b \u003e 0, errorMessage);\n        return a / b;\n    }\n\n    /**\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n     * reverting with custom message when dividing by zero.\n     *\n     * CAUTION: This function is deprecated because it requires allocating memory for the error\n     * message unnecessarily. For custom revert reasons use {tryMod}.\n     *\n     * Counterpart to Solidity\u0027s `%` operator. This function uses a `revert`\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\n     * invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n        require(b \u003e 0, errorMessage);\n        return a % b;\n    }\n}\n"},"UltraLightNodeV2.sol":{"content":"// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity 0.7.6;\npragma abicoder v2;\n\nimport \"./Ownable.sol\";\nimport \"./SafeMath.sol\";\nimport \"./ReentrancyGuard.sol\";\nimport \"./IERC20.sol\";\nimport \"./SafeERC20.sol\";\n\nimport \"./ILayerZeroValidationLibrary.sol\";\nimport \"./ILayerZeroReceiver.sol\";\nimport \"./ILayerZeroTreasury.sol\";\nimport \"./ILayerZeroEndpoint.sol\";\n// v2\nimport \"./ILayerZeroMessagingLibraryV2.sol\";\nimport \"./ILayerZeroOracleV2.sol\";\nimport \"./ILayerZeroUltraLightNodeV2.sol\";\nimport \"./ILayerZeroRelayerV2.sol\";\nimport \"./NonceContract.sol\";\n\ncontract UltraLightNodeV2 is ILayerZeroMessagingLibraryV2, ILayerZeroUltraLightNodeV2, ReentrancyGuard, Ownable {\n    using SafeERC20 for IERC20;\n    using SafeMath for uint;\n\n    // Application config\n    uint public constant CONFIG_TYPE_INBOUND_PROOF_LIBRARY_VERSION = 1;\n    uint public constant CONFIG_TYPE_INBOUND_BLOCK_CONFIRMATIONS = 2;\n    uint public constant CONFIG_TYPE_RELAYER = 3;\n    uint public constant CONFIG_TYPE_OUTBOUND_PROOF_TYPE = 4;\n    uint public constant CONFIG_TYPE_OUTBOUND_BLOCK_CONFIRMATIONS = 5;\n    uint public constant CONFIG_TYPE_ORACLE = 6;\n\n    // Token and Contracts\n    IERC20 public layerZeroToken;\n    ILayerZeroTreasury public treasuryContract;\n\n    mapping(address =\u003e uint) public nativeFees;\n    uint public treasuryZROFees;\n\n    // User Application\n    mapping(address =\u003e mapping(uint16 =\u003e ApplicationConfiguration)) public appConfig; // app address =\u003e chainId =\u003e config\n    mapping(uint16 =\u003e ApplicationConfiguration) public defaultAppConfig; // default UA settings if no version specified\n    mapping(uint16 =\u003e mapping(uint16 =\u003e bytes)) public defaultAdapterParams;\n\n    // Validation\n    mapping(uint16 =\u003e mapping(uint16 =\u003e address)) public inboundProofLibrary; // chainId =\u003e library Id =\u003e inboundProofLibrary contract\n    mapping(uint16 =\u003e uint16) public maxInboundProofLibrary; // chainId =\u003e inboundProofLibrary\n    mapping(uint16 =\u003e mapping(uint16 =\u003e bool)) public supportedOutboundProof; // chainId =\u003e outboundProofType =\u003e enabled\n    mapping(uint16 =\u003e uint) public chainAddressSizeMap;\n    mapping(address =\u003e mapping(uint16 =\u003e mapping(bytes32 =\u003e mapping(bytes32 =\u003e uint)))) public hashLookup; //[oracle][srcChainId][blockhash][datahash] -\u003e confirmation\n    mapping(uint16 =\u003e bytes32) public ulnLookup; // remote ulns\n\n    ILayerZeroEndpoint public immutable endpoint;\n    uint16 public immutable localChainId;\n    NonceContract public immutable nonceContract;\n\n    constructor(address _endpoint, address _nonceContract, uint16 _localChainId) {\n        require(_endpoint != address(0x0), \"LayerZero: endpoint cannot be zero address\");\n        require(_nonceContract != address(0x0), \"LayerZero: nonceContract cannot be zero address\");\n        ILayerZeroEndpoint lzEndpoint = ILayerZeroEndpoint(_endpoint);\n        localChainId = _localChainId;\n        endpoint = lzEndpoint;\n        nonceContract = NonceContract(_nonceContract);\n    }\n\n    // only the endpoint can call SEND() and setConfig()\n    modifier onlyEndpoint() {\n        require(address(endpoint) == msg.sender, \"LayerZero: only endpoint\");\n        _;\n    }\n\n    //----------------------------------------------------------------------------------\n    // PROTOCOL\n    function validateTransactionProof(uint16 _srcChainId, address _dstAddress, uint _gasLimit, bytes32 _lookupHash, bytes32 _blockData, bytes calldata _transactionProof) external override {\n        // retrieve UA\u0027s configuration using the _dstAddress from arguments.\n        ApplicationConfiguration memory uaConfig = _getAppConfig(_srcChainId, _dstAddress);\n\n        // assert that the caller == UA\u0027s relayer\n        require(uaConfig.relayer == msg.sender, \"LayerZero: invalid relayer\");\n\n        LayerZeroPacket.Packet memory _packet;\n        uint remoteAddressSize = chainAddressSizeMap[_srcChainId];\n        require(remoteAddressSize != 0, \"LayerZero: incorrect remote address size\");\n        {\n            // assert that the data submitted by UA\u0027s oracle have no fewer confirmations than UA\u0027s configuration\n            uint storedConfirmations = hashLookup[uaConfig.oracle][_srcChainId][_lookupHash][_blockData];\n            require(storedConfirmations \u003e 0 \u0026\u0026 storedConfirmations \u003e= uaConfig.inboundBlockConfirmations, \"LayerZero: not enough block confirmations\");\n\n            // decode\n            address inboundProofLib = inboundProofLibrary[_srcChainId][uaConfig.inboundProofLibraryVersion];\n            _packet = ILayerZeroValidationLibrary(inboundProofLib).validateProof(_blockData, _transactionProof, remoteAddressSize);\n        }\n\n        // packet content assertion\n        require(ulnLookup[_srcChainId] == _packet.ulnAddress \u0026\u0026 _packet.ulnAddress != bytes32(0), \"LayerZero: invalid _packet.ulnAddress\");\n        require(_packet.srcChainId == _srcChainId, \"LayerZero: invalid srcChain Id\");\n        // failsafe because the remoteAddress size being passed into validateProof trims the address this should not hit\n        require(_packet.srcAddress.length == remoteAddressSize, \"LayerZero: invalid srcAddress size\");\n        require(_packet.dstChainId == localChainId, \"LayerZero: invalid dstChain Id\");\n        require(_packet.dstAddress == _dstAddress, \"LayerZero: invalid dstAddress\");\n\n        // if the dst is not a contract, then emit and return early. This will break inbound nonces, but this particular\n        // path is already broken and wont ever be able to deliver anyways\n        if (!_isContract(_dstAddress)) {\n            emit InvalidDst(_packet.srcChainId, _packet.srcAddress, _packet.dstAddress, _packet.nonce, keccak256(_packet.payload));\n            return;\n        }\n\n        bytes memory pathData = abi.encodePacked(_packet.srcAddress, _packet.dstAddress);\n        emit PacketReceived(_packet.srcChainId, _packet.srcAddress, _packet.dstAddress, _packet.nonce, keccak256(_packet.payload));\n        endpoint.receivePayload(_srcChainId, pathData, _dstAddress, _packet.nonce, _gasLimit, _packet.payload);\n    }\n\n    function send(address _ua, uint64, uint16 _dstChainId, bytes calldata _path, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable override onlyEndpoint {\n        address ua = _ua;\n        uint16 dstChainId = _dstChainId;\n        require(ulnLookup[dstChainId] != bytes32(0), \"LayerZero: dstChainId does not exist\");\n\n        bytes memory dstAddress;\n        uint64 nonce;\n        // code block for solving \u0027Stack Too Deep\u0027\n        {\n            uint chainAddressSize = chainAddressSizeMap[dstChainId];\n            // path = remoteAddress + localAddress\n            require(chainAddressSize != 0 \u0026\u0026 _path.length == 20 + chainAddressSize, \"LayerZero: incorrect remote address size\");\n            address srcInPath;\n            bytes memory path = _path; // copy to memory\n            assembly {\n                srcInPath := mload(add(add(path, 20), chainAddressSize)) // chainAddressSize + 20\n            }\n            require(ua == srcInPath, \"LayerZero: wrong path data\");\n            dstAddress = _path[0:chainAddressSize];\n            nonce = nonceContract.increment(dstChainId, ua, path);\n        }\n\n        bytes memory payload = _payload;\n        ApplicationConfiguration memory uaConfig = _getAppConfig(dstChainId, ua);\n\n        // compute all the fees\n        uint relayerFee = _handleRelayer(dstChainId, uaConfig, ua, payload.length, _adapterParams);\n        uint oracleFee = _handleOracle(dstChainId, uaConfig, ua);\n        uint nativeProtocolFee = _handleProtocolFee(relayerFee, oracleFee, ua, _zroPaymentAddress);\n\n        // total native fee, does not include ZRO protocol fee\n        uint totalNativeFee = relayerFee.add(oracleFee).add(nativeProtocolFee);\n\n        // assert the user has attached enough native token for this address\n        require(totalNativeFee \u003c= msg.value, \"LayerZero: not enough native for fees\");\n        // refund if they send too much\n        uint amount = msg.value.sub(totalNativeFee);\n        if (amount \u003e 0) {\n            (bool success, ) = _refundAddress.call{value: amount}(\"\");\n            require(success, \"LayerZero: failed to refund\");\n        }\n\n        // emit the data packet\n        bytes memory encodedPayload = abi.encodePacked(nonce, localChainId, ua, dstChainId, dstAddress, payload);\n        emit Packet(encodedPayload);\n    }\n\n    function _handleRelayer(uint16 _dstChainId, ApplicationConfiguration memory _uaConfig, address _ua, uint _payloadSize, bytes memory _adapterParams) internal returns (uint relayerFee) {\n        if (_adapterParams.length == 0) {\n            _adapterParams = defaultAdapterParams[_dstChainId][_uaConfig.outboundProofType];\n        }\n        address relayerAddress = _uaConfig.relayer;\n        ILayerZeroRelayerV2 relayer = ILayerZeroRelayerV2(relayerAddress);\n        relayerFee = relayer.assignJob(_dstChainId, _uaConfig.outboundProofType, _ua, _payloadSize, _adapterParams);\n\n        _creditNativeFee(relayerAddress, relayerFee);\n\n        // emit the param events\n        emit RelayerParams(_adapterParams, _uaConfig.outboundProofType);\n    }\n\n    function _handleOracle(uint16 _dstChainId, ApplicationConfiguration memory _uaConfig, address _ua) internal returns (uint oracleFee) {\n        address oracleAddress = _uaConfig.oracle;\n        oracleFee = ILayerZeroOracleV2(oracleAddress).assignJob(_dstChainId, _uaConfig.outboundProofType, _uaConfig.outboundBlockConfirmations, _ua);\n\n        _creditNativeFee(oracleAddress, oracleFee);\n    }\n\n    function _handleProtocolFee(uint _relayerFee, uint _oracleFee, address _ua, address _zroPaymentAddress) internal returns (uint protocolNativeFee) {\n        // if no ZRO token or not specifying a payment address, pay in native token\n        bool payInNative = _zroPaymentAddress == address(0x0) || address(layerZeroToken) == address(0x0);\n        uint protocolFee = treasuryContract.getFees(!payInNative, _relayerFee, _oracleFee);\n\n        if (protocolFee \u003e 0) {\n            if (payInNative) {\n                address treasuryAddress = address(treasuryContract);\n                _creditNativeFee(treasuryAddress, protocolFee);\n                protocolNativeFee = protocolFee;\n            } else {\n                // zro payment address must equal the ua or the tx.origin otherwise the transaction reverts\n                require(_zroPaymentAddress == _ua || _zroPaymentAddress == tx.origin, \"LayerZero: must be paid by sender or origin\");\n\n                // transfer the LayerZero token to this contract from the payee\n                layerZeroToken.safeTransferFrom(_zroPaymentAddress, address(this), protocolFee);\n\n                treasuryZROFees = treasuryZROFees.add(protocolFee);\n            }\n        }\n    }\n\n    function _creditNativeFee(address _receiver, uint _amount) internal {\n        nativeFees[_receiver] = nativeFees[_receiver].add(_amount);\n    }\n\n    // Can be called by any address to update a block header\n    // can only upload new block data or the same block data with more confirmations\n    function updateHash(uint16 _srcChainId, bytes32 _lookupHash, uint _confirmations, bytes32 _blockData) external override {\n        uint storedConfirmations = hashLookup[msg.sender][_srcChainId][_lookupHash][_blockData];\n\n        // if it has a record, requires a larger confirmation.\n        require(storedConfirmations \u003c _confirmations, \"LayerZero: oracle data can only update if it has more confirmations\");\n\n        // set the new information into storage\n        hashLookup[msg.sender][_srcChainId][_lookupHash][_blockData] = _confirmations;\n\n        emit HashReceived(_srcChainId, msg.sender, _lookupHash, _blockData, _confirmations);\n    }\n\n    //----------------------------------------------------------------------------------\n    // Other Library Interfaces\n\n    // default to DEFAULT setting if ZERO value\n    function getAppConfig(uint16 _remoteChainId, address _ua) external view override returns (ApplicationConfiguration memory) {\n        return _getAppConfig(_remoteChainId, _ua);\n    }\n\n    function _getAppConfig(uint16 _remoteChainId, address _ua) internal view returns (ApplicationConfiguration memory) {\n        ApplicationConfiguration memory config = appConfig[_ua][_remoteChainId];\n        ApplicationConfiguration storage defaultConfig = defaultAppConfig[_remoteChainId];\n\n        if (config.inboundProofLibraryVersion == 0) {\n            config.inboundProofLibraryVersion = defaultConfig.inboundProofLibraryVersion;\n        }\n\n        if (config.inboundBlockConfirmations == 0) {\n            config.inboundBlockConfirmations = defaultConfig.inboundBlockConfirmations;\n        }\n\n        if (config.relayer == address(0x0)) {\n            config.relayer = defaultConfig.relayer;\n        }\n\n        if (config.outboundProofType == 0) {\n            config.outboundProofType = defaultConfig.outboundProofType;\n        }\n\n        if (config.outboundBlockConfirmations == 0) {\n            config.outboundBlockConfirmations = defaultConfig.outboundBlockConfirmations;\n        }\n\n        if (config.oracle == address(0x0)) {\n            config.oracle = defaultConfig.oracle;\n        }\n\n        return config;\n    }\n\n    function setConfig(uint16 _remoteChainId, address _ua, uint _configType, bytes calldata _config) external override onlyEndpoint {\n        ApplicationConfiguration storage uaConfig = appConfig[_ua][_remoteChainId];\n        if (_configType == CONFIG_TYPE_INBOUND_PROOF_LIBRARY_VERSION) {\n            uint16 inboundProofLibraryVersion = abi.decode(_config, (uint16));\n            require(inboundProofLibraryVersion \u003c= maxInboundProofLibrary[_remoteChainId], \"LayerZero: invalid inbound proof library version\");\n            uaConfig.inboundProofLibraryVersion = inboundProofLibraryVersion;\n        } else if (_configType == CONFIG_TYPE_INBOUND_BLOCK_CONFIRMATIONS) {\n            uint64 blockConfirmations = abi.decode(_config, (uint64));\n            uaConfig.inboundBlockConfirmations = blockConfirmations;\n        } else if (_configType == CONFIG_TYPE_RELAYER) {\n            address relayer = abi.decode(_config, (address));\n            uaConfig.relayer = relayer;\n        } else if (_configType == CONFIG_TYPE_OUTBOUND_PROOF_TYPE) {\n            uint16 outboundProofType = abi.decode(_config, (uint16));\n            require(supportedOutboundProof[_remoteChainId][outboundProofType] || outboundProofType == 0, \"LayerZero: invalid outbound proof type\");\n            uaConfig.outboundProofType = outboundProofType;\n        } else if (_configType == CONFIG_TYPE_OUTBOUND_BLOCK_CONFIRMATIONS) {\n            uint64 blockConfirmations = abi.decode(_config, (uint64));\n            uaConfig.outboundBlockConfirmations = blockConfirmations;\n        } else if (_configType == CONFIG_TYPE_ORACLE) {\n            address oracle = abi.decode(_config, (address));\n            uaConfig.oracle = oracle;\n        } else {\n            revert(\"LayerZero: Invalid config type\");\n        }\n\n        emit AppConfigUpdated(_ua, _configType, _config);\n    }\n\n    function getConfig(uint16 _remoteChainId, address _ua, uint _configType) external view override returns (bytes memory) {\n        ApplicationConfiguration storage uaConfig = appConfig[_ua][_remoteChainId];\n\n        if (_configType == CONFIG_TYPE_INBOUND_PROOF_LIBRARY_VERSION) {\n            if (uaConfig.inboundProofLibraryVersion == 0) {\n                return abi.encode(defaultAppConfig[_remoteChainId].inboundProofLibraryVersion);\n            }\n            return abi.encode(uaConfig.inboundProofLibraryVersion);\n        } else if (_configType == CONFIG_TYPE_INBOUND_BLOCK_CONFIRMATIONS) {\n            if (uaConfig.inboundBlockConfirmations == 0) {\n                return abi.encode(defaultAppConfig[_remoteChainId].inboundBlockConfirmations);\n            }\n            return abi.encode(uaConfig.inboundBlockConfirmations);\n        } else if (_configType == CONFIG_TYPE_RELAYER) {\n            if (uaConfig.relayer == address(0x0)) {\n                return abi.encode(defaultAppConfig[_remoteChainId].relayer);\n            }\n            return abi.encode(uaConfig.relayer);\n        } else if (_configType == CONFIG_TYPE_OUTBOUND_PROOF_TYPE) {\n            if (uaConfig.outboundProofType == 0) {\n                return abi.encode(defaultAppConfig[_remoteChainId].outboundProofType);\n            }\n            return abi.encode(uaConfig.outboundProofType);\n        } else if (_configType == CONFIG_TYPE_OUTBOUND_BLOCK_CONFIRMATIONS) {\n            if (uaConfig.outboundBlockConfirmations == 0) {\n                return abi.encode(defaultAppConfig[_remoteChainId].outboundBlockConfirmations);\n            }\n            return abi.encode(uaConfig.outboundBlockConfirmations);\n        } else if (_configType == CONFIG_TYPE_ORACLE) {\n            if (uaConfig.oracle == address(0x0)) {\n                return abi.encode(defaultAppConfig[_remoteChainId].oracle);\n            }\n            return abi.encode(uaConfig.oracle);\n        } else {\n            revert(\"LayerZero: Invalid config type\");\n        }\n    }\n\n    // returns the native fee the UA pays to cover fees\n    function estimateFees(uint16 _dstChainId, address _ua, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParams) external view override returns (uint nativeFee, uint zroFee) {\n        ApplicationConfiguration memory uaConfig = _getAppConfig(_dstChainId, _ua);\n\n        // Relayer Fee\n        bytes memory adapterParams;\n        if (_adapterParams.length \u003e 0) {\n            adapterParams = _adapterParams;\n        } else {\n            adapterParams = defaultAdapterParams[_dstChainId][uaConfig.outboundProofType];\n        }\n        uint relayerFee = ILayerZeroRelayerV2(uaConfig.relayer).getFee(_dstChainId, uaConfig.outboundProofType, _ua, _payload.length, adapterParams);\n\n        // Oracle Fee\n        address ua = _ua; // stack too deep\n        uint oracleFee = ILayerZeroOracleV2(uaConfig.oracle).getFee(_dstChainId, uaConfig.outboundProofType, uaConfig.outboundBlockConfirmations, ua);\n\n        // LayerZero Fee\n        uint protocolFee = treasuryContract.getFees(_payInZRO, relayerFee, oracleFee);\n        _payInZRO ? zroFee = protocolFee : nativeFee = protocolFee;\n\n        // return the sum of fees\n        nativeFee = nativeFee.add(relayerFee).add(oracleFee);\n    }\n\n    //---------------------------------------------------------------------------\n    // Claim Fees\n\n    // universal withdraw ZRO token function\n    function withdrawZRO(address _to, uint _amount) external override nonReentrant {\n        require(msg.sender == address(treasuryContract), \"LayerZero: only treasury\");\n        treasuryZROFees = treasuryZROFees.sub(_amount);\n        layerZeroToken.safeTransfer(_to, _amount);\n        emit WithdrawZRO(msg.sender, _to, _amount);\n    }\n\n    // universal withdraw native token function.\n    // the source contract should perform all the authentication control\n    function withdrawNative(address payable _to, uint _amount) external override nonReentrant {\n        require(_to != address(0x0), \"LayerZero: _to cannot be zero address\");\n        nativeFees[msg.sender] = nativeFees[msg.sender].sub(_amount);\n\n        (bool success, ) = _to.call{value: _amount}(\"\");\n        require(success, \"LayerZero: withdraw failed\");\n        emit WithdrawNative(msg.sender, _to, _amount);\n    }\n\n    //---------------------------------------------------------------------------\n    // Owner calls, configuration only.\n    function setLayerZeroToken(address _layerZeroToken) external onlyOwner {\n        require(_layerZeroToken != address(0x0), \"LayerZero: _layerZeroToken cannot be zero address\");\n        layerZeroToken = IERC20(_layerZeroToken);\n        emit SetLayerZeroToken(_layerZeroToken);\n    }\n\n    function setTreasury(address _treasury) external onlyOwner {\n        require(_treasury != address(0x0), \"LayerZero: treasury cannot be zero address\");\n        treasuryContract = ILayerZeroTreasury(_treasury);\n        emit SetTreasury(_treasury);\n    }\n\n    function addInboundProofLibraryForChain(uint16 _chainId, address _library) external onlyOwner {\n        require(_library != address(0x0), \"LayerZero: library cannot be zero address\");\n        uint16 libId = maxInboundProofLibrary[_chainId];\n        require(libId \u003c 65535, \"LayerZero: can not add new library\");\n        maxInboundProofLibrary[_chainId] = ++libId;\n        inboundProofLibrary[_chainId][libId] = _library;\n        emit AddInboundProofLibraryForChain(_chainId, _library);\n    }\n\n    function enableSupportedOutboundProof(uint16 _chainId, uint16 _proofType) external onlyOwner {\n        supportedOutboundProof[_chainId][_proofType] = true;\n        emit EnableSupportedOutboundProof(_chainId, _proofType);\n    }\n\n    function setDefaultConfigForChainId(uint16 _chainId, uint16 _inboundProofLibraryVersion, uint64 _inboundBlockConfirmations, address _relayer, uint16 _outboundProofType, uint64 _outboundBlockConfirmations, address _oracle) external onlyOwner {\n        require(_inboundProofLibraryVersion \u003c= maxInboundProofLibrary[_chainId] \u0026\u0026 _inboundProofLibraryVersion \u003e 0, \"LayerZero: invalid inbound proof library version\");\n        require(_inboundBlockConfirmations \u003e 0, \"LayerZero: invalid inbound block confirmation\");\n        require(_relayer != address(0x0), \"LayerZero: invalid relayer address\");\n        require(supportedOutboundProof[_chainId][_outboundProofType], \"LayerZero: invalid outbound proof type\");\n        require(_outboundBlockConfirmations \u003e 0, \"LayerZero: invalid outbound block confirmation\");\n        require(_oracle != address(0x0), \"LayerZero: invalid oracle address\");\n        defaultAppConfig[_chainId] = ApplicationConfiguration(_inboundProofLibraryVersion, _inboundBlockConfirmations, _relayer, _outboundProofType, _outboundBlockConfirmations, _oracle);\n        emit SetDefaultConfigForChainId(_chainId, _inboundProofLibraryVersion, _inboundBlockConfirmations, _relayer, _outboundProofType, _outboundBlockConfirmations, _oracle);\n    }\n\n    function setDefaultAdapterParamsForChainId(uint16 _chainId, uint16 _proofType, bytes calldata _adapterParams) external onlyOwner {\n        defaultAdapterParams[_chainId][_proofType] = _adapterParams;\n        emit SetDefaultAdapterParamsForChainId(_chainId, _proofType, _adapterParams);\n    }\n\n    function setRemoteUln(uint16 _remoteChainId, bytes32 _remoteUln) external onlyOwner {\n        require(ulnLookup[_remoteChainId] == bytes32(0), \"LayerZero: remote uln already set\");\n        ulnLookup[_remoteChainId] = _remoteUln;\n        emit SetRemoteUln(_remoteChainId, _remoteUln);\n    }\n\n    function setChainAddressSize(uint16 _chainId, uint _size) external onlyOwner {\n        require(chainAddressSizeMap[_chainId] == 0, \"LayerZero: remote chain address size already set\");\n        chainAddressSizeMap[_chainId] = _size;\n        emit SetChainAddressSize(_chainId, _size);\n    }\n\n    //----------------------------------------------------------------------------------\n    // view functions\n\n    function accruedNativeFee(address _address) external view override returns (uint) {\n        return nativeFees[_address];\n    }\n\n    function getOutboundNonce(uint16 _chainId, bytes calldata _path) external view override returns (uint64) {\n        return nonceContract.outboundNonce(_chainId, _path);\n    }\n\n    function _isContract(address addr) internal view returns (bool) {\n        uint size;\n        assembly {\n            size := extcodesize(addr)\n        }\n        return size != 0;\n    }\n}\n"}}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
import "./interfaces/ILayerZeroEndpoint.sol";
contract NonceContract {
    ILayerZeroEndpoint public immutable endpoint;
    // outboundNonce = [dstChainId][remoteAddress + localAddress]
    mapping(uint16 => mapping(bytes => uint64)) public outboundNonce;
    constructor(address _endpoint) {
        endpoint = ILayerZeroEndpoint(_endpoint);
    }
    function increment(uint16 _chainId, address _ua, bytes calldata _path) external returns (uint64) {
        require(endpoint.getSendLibraryAddress(_ua) == msg.sender, "NonceContract: msg.sender is not valid sendlibrary");
        return ++outboundNonce[_chainId][_path];
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
import "./ILayerZeroUserApplicationConfig.sol";
interface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {
    // @notice send a LayerZero message to the specified address at a LayerZero endpoint.
    // @param _dstChainId - the destination chain identifier
    // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains
    // @param _payload - a custom bytes payload to send to the destination contract
    // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address
    // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction
    // @param _adapterParams - parameters for custom functionality. e.g. receive airdropped native gas from the relayer on destination
    function send(uint16 _dstChainId, bytes calldata _destination, bytes calldata _payload, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;
    // @notice used by the messaging library to publish verified payload
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source contract (as bytes) at the source chain
    // @param _dstAddress - the address on destination chain
    // @param _nonce - the unbound message ordering nonce
    // @param _gasLimit - the gas limit for external contract execution
    // @param _payload - verified payload to send to the destination contract
    function receivePayload(uint16 _srcChainId, bytes calldata _srcAddress, address _dstAddress, uint64 _nonce, uint _gasLimit, bytes calldata _payload) external;
    // @notice get the inboundNonce of a receiver from a source chain which could be EVM or non-EVM chain
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64);
    // @notice get the outboundNonce from this source chain which, consequently, is always an EVM
    // @param _srcAddress - the source chain contract address
    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64);
    // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery
    // @param _dstChainId - the destination chain identifier
    // @param _userApplication - the user app address on this EVM chain
    // @param _payload - the custom message to send over LayerZero
    // @param _payInZRO - if false, user app pays the protocol fee in native token
    // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain
    function estimateFees(uint16 _dstChainId, address _userApplication, bytes calldata _payload, bool _payInZRO, bytes calldata _adapterParam) external view returns (uint nativeFee, uint zroFee);
    // @notice get this Endpoint's immutable source identifier
    function getChainId() external view returns (uint16);
    // @notice the interface to retry failed message on this Endpoint destination
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    // @param _payload - the payload to be retried
    function retryPayload(uint16 _srcChainId, bytes calldata _srcAddress, bytes calldata _payload) external;
    // @notice query if any STORED payload (message blocking) at the endpoint.
    // @param _srcChainId - the source chain identifier
    // @param _srcAddress - the source chain contract address
    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool);
    // @notice query if the _libraryAddress is valid for sending msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getSendLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the _libraryAddress is valid for receiving msgs.
    // @param _userApplication - the user app address on this EVM chain
    function getReceiveLibraryAddress(address _userApplication) external view returns (address);
    // @notice query if the non-reentrancy guard for send() is on
    // @return true if the guard is on. false otherwise
    function isSendingPayload() external view returns (bool);
    // @notice query if the non-reentrancy guard for receive() is on
    // @return true if the guard is on. false otherwise
    function isReceivingPayload() external view returns (bool);
    // @notice get the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _userApplication - the contract address of the user application
    // @param _configType - type of configuration. every messaging library has its own convention.
    function getConfig(uint16 _version, uint16 _chainId, address _userApplication, uint _configType) external view returns (bytes memory);
    // @notice get the send() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getSendVersion(address _userApplication) external view returns (uint16);
    // @notice get the lzReceive() LayerZero messaging library version
    // @param _userApplication - the contract address of the user application
    function getReceiveVersion(address _userApplication) external view returns (uint16);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;
interface ILayerZeroUserApplicationConfig {
    // @notice set the configuration of the LayerZero messaging library of the specified version
    // @param _version - messaging library version
    // @param _chainId - the chainId for the pending config change
    // @param _configType - type of configuration. every messaging library has its own convention.
    // @param _config - configuration in the bytes. can encode arbitrary content.
    function setConfig(uint16 _version, uint16 _chainId, uint _configType, bytes calldata _config) external;
    // @notice set the send() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setSendVersion(uint16 _version) external;
    // @notice set the lzReceive() LayerZero messaging library version to _version
    // @param _version - new messaging library version
    function setReceiveVersion(uint16 _version) external;
    // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload
    // @param _srcChainId - the chainId of the source chain
    // @param _srcAddress - the contract address of the source contract at the source chain
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 * 
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 * 
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     * 
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }
    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal virtual view returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     * 
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback () payable external {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive () payable external {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     * 
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "./Proxy.sol";
import "../utils/Address.sol";
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 * 
 * Upgradeability is only provided internally through {_upgradeTo}. For an externally upgradeable proxy see
 * {TransparentUpgradeableProxy}.
 */
contract UpgradeableProxy is Proxy {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     * 
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _setImplementation(_logic);
        if(_data.length > 0) {
            // solhint-disable-next-line avoid-low-level-calls
            (bool success,) = _logic.delegatecall(_data);
            require(success);
        }
    }
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal override view returns (address impl) {
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            impl := sload(slot)
        }
    }
    /**
     * @dev Upgrades the proxy to a new implementation.
     * 
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "UpgradeableProxy: new implementation is not a contract");
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newImplementation)
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }
    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "../openzeppelin/proxy/UpgradeableProxy.sol";
/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative inerface of your proxy.
 */
contract OptimizedTransparentUpgradeableProxy is UpgradeableProxy {
    address internal immutable _ADMIN;
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {UpgradeableProxy-constructor}.
     */
    constructor(
        address initialLogic,
        address initialAdmin,
        bytes memory _data
    ) payable UpgradeableProxy(initialLogic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        bytes32 slot = _ADMIN_SLOT;
        _ADMIN = initialAdmin;
        // still store it to work with EIP-1967
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, initialAdmin)
        }
    }
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _admin()) {
            _;
        } else {
            _fallback();
        }
    }
    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address) {
        return _admin();
    }
    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address) {
        return _implementation();
    }
    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeTo(newImplementation);
    }
    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeTo(newImplementation);
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, ) = newImplementation.delegatecall(data);
        require(success);
    }
    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view returns (address adm) {
        return _ADMIN;
    }
    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _admin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
struct PacketForQuote {
    address sender;
    uint32 dstEid;
    bytes message;
}
struct Packet {
    uint64 nonce;
    uint32 srcEid;
    address sender;
    uint32 dstEid;
    bytes32 receiver;
    bytes32 guid;
    bytes message;
}
struct Origin {
    uint32 srcEid;
    bytes32 sender;
    uint64 nonce;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
import "./IMessageLibManager.sol";
import "./IMessagingComposer.sol";
import "./IMessagingChannel.sol";
import "./IMessagingContext.sol";
import {Origin} from "../MessagingStructs.sol";
struct MessagingParams {
    uint32 dstEid;
    bytes32 receiver;
    bytes message;
    bytes options;
}
struct MessagingReceipt {
    bytes32 guid;
    uint64 nonce;
    MessagingFee fee;
}
struct MessagingFee {
    uint nativeFee;
    uint lzTokenFee;
}
interface ILayerZeroEndpointV2 is IMessageLibManager, IMessagingComposer, IMessagingChannel, IMessagingContext {
    event PacketSent(bytes encodedPayload, bytes options, address sendLibrary);
    event PacketDelivered(Origin origin, address receiver, bytes32 payloadHash);
    event PacketReceived(Origin origin, address receiver);
    event LzReceiveFailed(Origin origin, address receiver, bytes reason);
    event LayerZeroTokenSet(address token);
    function quote(
        address _sender,
        uint32 _dstEid,
        bytes calldata _message,
        bool _payInLzToken,
        bytes calldata _options
    ) external view returns (MessagingFee memory);
    function send(
        MessagingParams calldata _params,
        uint _lzTokenFee,
        address payable _refundAddress
    ) external payable returns (MessagingReceipt memory);
    function sendWithAlt(
        MessagingParams calldata _params,
        uint _lzTokenFee,
        uint _altTokenFee
    ) external returns (MessagingReceipt memory);
    function deliver(Origin calldata _origin, address _receiver, bytes32 _payloadHash) external;
    function deliverable(Origin calldata _origin, address _receiveLib, address _receiver) external view returns (bool);
    function lzReceive(
        Origin calldata _origin,
        address _receiver,
        bytes32 _guid,
        bytes calldata _message,
        bytes calldata _extraData
    ) external payable returns (bool, bytes memory);
    // oapp can burn messages partially by calling this function with its own business logic if messages are delivered in order
    function clear(Origin calldata _origin, bytes32 _guid, bytes calldata _message) external;
    function setLayerZeroToken(address _layerZeroToken) external;
    function layerZeroToken() external view returns (address);
    function altFeeToken() external view returns (address);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import {MessagingFee, SetConfigParam} from "./ILayerZeroEndpointV2.sol";
import {Packet, PacketForQuote} from "../MessagingStructs.sol";
interface IMessageLib is IERC165 {
    function send(
        Packet calldata _packet,
        bytes calldata _options,
        bool _payInLzToken
    ) external returns (MessagingFee memory, bytes memory encodedPacket);
    function quote(
        PacketForQuote calldata _packet,
        bool _payInLzToken,
        bytes calldata _options
    ) external view returns (MessagingFee memory);
    function setTreasury(address _treasury) external;
    function setConfig(address _oapp, uint32 _eid, SetConfigParam[] calldata _config) external;
    function snapshotConfig(uint32[] calldata _eids, address _oapp) external;
    function resetConfig(uint32[] calldata _eids, address _oapp) external;
    function getConfig(
        uint32 _eid,
        address _oapp,
        uint32 _configType
    ) external view returns (bytes memory config, bool isDefault);
    function getDefaultConfig(uint32 _eid, uint32 _configType) external view returns (bytes memory);
    function isSupportedEid(uint32 _eid) external view returns (bool);
    function withdrawFee(address _to, uint _amount) external;
    function withdrawLzTokenFee(address _lzToken, address _to, uint _amount) external;
    // message libs of same major version are compatible
    function version() external view returns (uint64 major, uint8 minor, uint8 endpointVersion);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
struct SetConfigParam {
    uint32 configType;
    bytes config;
}
interface IMessageLibManager {
    struct Timeout {
        address lib;
        uint expiry;
    }
    event LibraryRegistered(address newLib);
    event DefaultSendLibrarySet(uint32 eid, address newLib);
    event DefaultReceiveLibrarySet(uint32 eid, address oldLib, address newLib);
    event DefaultReceiveLibraryTimeoutSet(uint32 eid, address oldLib, uint expiry);
    event SendLibrarySet(address sender, uint32 eid, address newLib);
    event ReceiveLibrarySet(address receiver, uint32 eid, address oldLib, address newLib);
    event ReceiveLibraryTimoutSet(address receiver, uint32 eid, address oldLib, uint timeout);
    function registerLibrary(address _lib) external;
    function isRegisteredLibrary(address _lib) external view returns (bool);
    function getRegisteredLibraries() external view returns (address[] memory);
    function setDefaultSendLibrary(uint32 _eid, address _newLib) external;
    function defaultSendLibrary(uint32 _eid) external view returns (address);
    function setDefaultReceiveLibrary(uint32 _eid, address _newLib, uint _timeout) external;
    function defaultReceiveLibrary(uint32 _eid) external view returns (address);
    function setDefaultReceiveLibraryTimeout(uint32 _eid, address _lib, uint _expiry) external;
    function defaultReceiveLibraryTimeout(uint32 _eid) external view returns (address lib, uint expiry);
    function defaultConfig(address _lib, uint32 _eid, uint32 _configType) external view returns (bytes memory);
    function isSupportedEid(uint32 _eid) external view returns (bool);
    /// ------------------- OApp interfaces -------------------
    function setSendLibrary(uint32 _eid, address _newLib) external;
    function getSendLibrary(address _sender, uint32 _eid) external view returns (address lib);
    function isDefaultSendLibrary(address _sender, uint32 _eid) external view returns (bool);
    function setReceiveLibrary(uint32 _eid, address _newLib, uint _gracePeriod) external;
    function getReceiveLibrary(address _receiver, uint32 _eid) external view returns (address lib, bool isDefault);
    function setReceiveLibraryTimeout(uint32 _eid, address _lib, uint _gracePeriod) external;
    function receiveLibraryTimeout(address _receiver, uint32 _eid) external view returns (address lib, uint expiry);
    function setConfig(address _lib, uint32 _eid, SetConfigParam[] calldata _params) external;
    function getConfig(
        address _oapp,
        address _lib,
        uint32 _eid,
        uint32 _configType
    ) external view returns (bytes memory config, bool isDefault);
    function snapshotConfig(address _lib, uint32[] calldata _eids) external;
    function resetConfig(address _lib, uint32[] calldata _eids) external;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
interface IMessagingChannel {
    event InboundNonceSkipped(uint32 srcEid, bytes32 sender, address receiver, uint64 nonce);
    function eid() external view returns (uint32);
    // this is an emergency function if a message can not be delivered for some reasons
    // required to provide _nextNonce to avoid race condition
    function skip(uint32 _srcEid, bytes32 _sender, uint64 _nonce) external;
    function nextGuid(address _sender, uint32 _dstEid, bytes32 _receiver) external view returns (bytes32);
    function inboundNonce(address _receiver, uint32 _srcEid, bytes32 _sender) external view returns (uint64);
    function outboundNonce(address _sender, uint32 _dstEid, bytes32 _receiver) external view returns (uint64);
    function inboundPayloadHash(
        address _receiver,
        uint32 _srcEid,
        bytes32 _sender,
        uint64 _nonce
    ) external view returns (bytes32);
    function hasPayloadHash(
        address _receiver,
        uint32 _srcEid,
        bytes32 _sender,
        uint64 _nonce
    ) external view returns (bool);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
interface IMessagingComposer {
    event ComposedMessageDelivered(address receiver, address composer, bytes32 guid, bytes message);
    event ComposedMessageReceived(address receiver, address composer, bytes32 guid);
    event LzComposeFailed(address receiver, address composer, bytes32 guid, bytes reason);
    function deliverComposedMessage(address _composer, bytes32 _guid, bytes calldata _message) external;
    function lzCompose(
        address _receiver,
        address _composer,
        bytes32 _guid,
        bytes calldata _message,
        bytes calldata _extraData
    ) external payable returns (bool, bytes memory);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
interface IMessagingContext {
    function isSendingMessage() external view returns (bool);
    function getSendContext() external view returns (uint32, address);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;
library Errors {
    // Invalid Argument (http: 400)
    string internal constant INVALID_ARGUMENT = "LZ10000";
    string internal constant ONLY_REGISTERED = "LZ10001";
    string internal constant ONLY_REGISTERED_OR_DEFAULT = "LZ10002";
    string internal constant INVALID_AMOUNT = "LZ10003";
    string internal constant INVALID_NONCE = "LZ10004";
    string internal constant SAME_VALUE = "LZ10005";
    string internal constant UNSORTED = "LZ10006";
    string internal constant INVALID_VERSION = "LZ10007";
    string internal constant INVALID_EID = "LZ10008";
    string internal constant INVALID_SIZE = "LZ10009";
    string internal constant ONLY_NON_DEFAULT = "LZ10010";
    string internal constant INVALID_VERIFIERS = "LZ10011";
    string internal constant INVALID_WORKER_ID = "LZ10012";
    string internal constant DUPLICATED_OPTION = "LZ10013";
    string internal constant INVALID_LEGACY_OPTION = "LZ10014";
    string internal constant INVALID_VERIFIER_OPTION = "LZ10015";
    string internal constant INVALID_WORKER_OPTIONS = "LZ10016";
    string internal constant INVALID_EXECUTOR_OPTION = "LZ10017";
    string internal constant INVALID_ADDRESS = "LZ10018";
    // Out of Range (http: 400)
    string internal constant OUT_OF_RANGE = "LZ20000";
    // Invalid State (http: 400)
    string internal constant INVALID_STATE = "LZ30000";
    string internal constant SEND_REENTRANCY = "LZ30001";
    string internal constant RECEIVE_REENTRANCY = "LZ30002";
    string internal constant COMPOSE_REENTRANCY = "LZ30003";
    // Permission Denied (http: 403)
    string internal constant PERMISSION_DENIED = "LZ50000";
    // Not Found (http: 404)
    string internal constant NOT_FOUND = "LZ60000";
    // Already Exists (http: 409)
    string internal constant ALREADY_EXISTS = "LZ80000";
    // Not Implemented (http: 501)
    string internal constant NOT_IMPLEMENTED = "LZC0000";
    string internal constant UNSUPPORTED_INTERFACE = "LZC0001";
    string internal constant UNSUPPORTED_OPTION_TYPE = "LZC0002";
    // Unavailable (http: 503)
    string internal constant UNAVAILABLE = "LZD0000";
    string internal constant NATIVE_COIN_UNAVAILABLE = "LZD0001";
    string internal constant TOKEN_UNAVAILABLE = "LZD0002";
    string internal constant DEFAULT_LIBRARY_UNAVAILABLE = "LZD0003";
    string internal constant VERIFIERS_UNAVAILABLE = "LZD0004";
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
interface ILayerZeroUltraLightNodeV2 {
    // Relayer functions
    function validateTransactionProof(
        uint16 _srcChainId,
        address _dstAddress,
        uint _gasLimit,
        bytes32 _lookupHash,
        bytes32 _blockData,
        bytes calldata _transactionProof
    ) external;
    // an Oracle delivers the block data using updateHash()
    function updateHash(uint16 _srcChainId, bytes32 _lookupHash, uint _confirmations, bytes32 _blockData) external;
    // can only withdraw the receivable of the msg.sender
    function withdrawNative(address payable _to, uint _amount) external;
    function withdrawZRO(address _to, uint _amount) external;
    // view functions
    function getAppConfig(
        uint16 _remoteChainId,
        address _userApplicationAddress
    ) external view returns (ApplicationConfiguration memory);
    function accruedNativeFee(address _address) external view returns (uint);
    struct ApplicationConfiguration {
        uint16 inboundProofLibraryVersion;
        uint64 inboundBlockConfirmations;
        address relayer;
        uint16 outboundProofType;
        uint64 outboundBlockConfirmations;
        address oracle;
    }
    event HashReceived(
        uint16 indexed srcChainId,
        address indexed oracle,
        bytes32 lookupHash,
        bytes32 blockData,
        uint confirmations
    );
    event RelayerParams(bytes adapterParams, uint16 outboundProofType);
    event Packet(bytes payload);
    event InvalidDst(
        uint16 indexed srcChainId,
        bytes srcAddress,
        address indexed dstAddress,
        uint64 nonce,
        bytes32 payloadHash
    );
    event PacketReceived(
        uint16 indexed srcChainId,
        bytes srcAddress,
        address indexed dstAddress,
        uint64 nonce,
        bytes32 payloadHash
    );
    event AppConfigUpdated(address indexed userApplication, uint indexed configType, bytes newConfig);
    event AddInboundProofLibraryForChain(uint16 indexed chainId, address lib);
    event EnableSupportedOutboundProof(uint16 indexed chainId, uint16 proofType);
    event SetChainAddressSize(uint16 indexed chainId, uint size);
    event SetDefaultConfigForChainId(
        uint16 indexed chainId,
        uint16 inboundProofLib,
        uint64 inboundBlockConfirm,
        address relayer,
        uint16 outboundProofType,
        uint64 outboundBlockConfirm,
        address oracle
    );
    event SetDefaultAdapterParamsForChainId(uint16 indexed chainId, uint16 indexed proofType, bytes adapterParams);
    event SetLayerZeroToken(address indexed tokenAddress);
    event SetRemoteUln(uint16 indexed chainId, bytes32 uln);
    event SetTreasury(address indexed treasuryAddress);
    event WithdrawZRO(address indexed msgSender, address indexed to, uint amount);
    event WithdrawNative(address indexed msgSender, address indexed to, uint amount);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/AccessControl.sol)
pragma solidity ^0.8.0;
import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";
/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }
    mapping(bytes32 => RoleData) private _roles;
    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;
    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }
    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }
    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }
    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(account),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }
    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }
    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }
    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }
    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");
        _revokeRole(role, account);
    }
    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }
    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }
    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }
    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)
pragma solidity ^0.8.0;
/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);
    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);
    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);
    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);
    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);
    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;
    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;
    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);
    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);
    bool private _paused;
    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }
    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }
    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }
    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }
    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }
    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)
pragma solidity ^0.8.0;
import "./math/Math.sol";
import "./math/SignedMath.sol";
/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;
    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }
    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/cryptography/ECDSA.sol)
pragma solidity ^0.8.0;
import "../Strings.sol";
/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV // Deprecated in v4.8
    }
    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        }
    }
    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }
    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }
    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }
    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }
    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }
        return (signer, RecoverError.NoError);
    }
    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }
    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32 message) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, "\\x19Ethereum Signed Message:\
32")
            mstore(0x1c, hash)
            message := keccak256(0x00, 0x3c)
        }
    }
    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\\x19Ethereum Signed Message:\
", Strings.toString(s.length), s));
    }
    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 data) {
        /// @solidity memory-safe-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, "\\x19\\x01")
            mstore(add(ptr, 0x02), domainSeparator)
            mstore(add(ptr, 0x22), structHash)
            data := keccak256(ptr, 0x42)
        }
    }
    /**
     * @dev Returns an Ethereum Signed Data with intended validator, created from a
     * `validator` and `data` according to the version 0 of EIP-191.
     *
     * See {recover}.
     */
    function toDataWithIntendedValidatorHash(address validator, bytes memory data) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\\x19\\x00", validator, data));
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)
pragma solidity ^0.8.0;
/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }
    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }
    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }
    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }
    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }
            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }
            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");
            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////
            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)
                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }
            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.
            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)
                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)
                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }
            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;
            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;
            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256
            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }
    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }
    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);
        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }
    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }
    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }
    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }
    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }
    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }
    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }
    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)
pragma solidity ^0.8.0;
/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }
    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }
    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }
    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.19;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@layerzerolabs/lz-evm-protocol-v2/contracts/libs/Errors.sol";
import "./interfaces/ILayerZeroExecutor.sol";
import "./interfaces/ILayerZeroTreasury.sol";
struct WorkerOptions {
    uint8 workerId;
    bytes options;
}
enum DeliveryState {
    Signing,
    Deliverable,
    Delivered,
    Waiting
}
abstract contract MessageLibBase is Ownable {
    address internal immutable endpoint;
    uint32 internal immutable localEid;
    uint internal immutable treasuryGasCap;
    // config
    address public treasury;
    // accumulated fees for workers and treasury
    mapping(address worker => uint) public fees;
    event ExecutorFeePaid(address executor, uint fee);
    event TreasurySet(address treasury);
    // only the endpoint can call SEND() and setConfig()
    modifier onlyEndpoint() {
        require(endpoint == msg.sender, Errors.PERMISSION_DENIED);
        _;
    }
    constructor(address _endpoint, uint32 _localEid, uint _treasuryGasCap) {
        endpoint = _endpoint;
        localEid = _localEid;
        treasuryGasCap = _treasuryGasCap;
    }
    // ======================= Internal =======================
    function _assertMessageSize(uint _actual, uint _max) internal pure {
        require(_actual <= _max, Errors.INVALID_SIZE);
    }
    function _sendToExecutor(
        address _executor,
        uint32 _dstEid,
        address _sender,
        uint _msgSize,
        bytes memory _executorOptions
    ) internal returns (uint executorFee) {
        executorFee = ILayerZeroExecutor(_executor).assignJob(_dstEid, _sender, _msgSize, _executorOptions);
        if (executorFee > 0) {
            fees[_executor] += executorFee;
        }
        emit ExecutorFeePaid(_executor, executorFee);
    }
    function _sendToTreasury(
        address _sender,
        uint32 _dstEid,
        uint _totalNativeFee,
        bool _payInLzToken
    ) internal returns (uint treasuryNativeFee, uint lzTokenFee) {
        // fee should be in lzTokenFee if payInLzToken, otherwise in native
        (treasuryNativeFee, lzTokenFee) = _quoteTreasuryFee(_sender, _dstEid, _totalNativeFee, _payInLzToken);
        // if payInLzToken, handle in messagelib / endpoint
        if (treasuryNativeFee > 0) {
            fees[treasury] += treasuryNativeFee;
        }
    }
    function _quote(
        address _sender,
        uint32 _dstEid,
        uint _msgSize,
        bool _payInLzToken,
        bytes calldata _options
    ) internal view returns (uint, uint) {
        require(_options.length > 0, Errors.INVALID_ARGUMENT);
        (bytes memory executorOptions, WorkerOptions[] memory otherWorkerOptions) = _getExecutorAndOtherOptions(
            _options
        );
        // quote other workers
        (uint nativeFee, address executor, uint maxMsgSize) = _quoteWorkers(_sender, _dstEid, otherWorkerOptions);
        // assert msg size
        _assertMessageSize(_msgSize, maxMsgSize);
        // quote executor
        nativeFee += ILayerZeroExecutor(executor).getFee(_dstEid, _sender, _msgSize, executorOptions);
        // quote treasury
        (uint treasuryNativeFee, uint lzTokenFee) = _quoteTreasuryFee(_sender, _dstEid, nativeFee, _payInLzToken);
        if (treasuryNativeFee > 0) {
            nativeFee += treasuryNativeFee;
        }
        return (nativeFee, lzTokenFee);
    }
    function _quoteTreasuryFee(
        address _sender,
        uint32 _eid,
        uint _totalFee,
        bool _payInLzToken
    ) internal view returns (uint nativeFee, uint lzTokenFee) {
        if (treasury != address(0x0)) {
            try ILayerZeroTreasury(treasury).getFee(_sender, _eid, _totalFee, _payInLzToken) returns (
                uint treasuryFee
            ) {
                // success
                if (_payInLzToken) {
                    lzTokenFee = treasuryFee;
                } else {
                    // pay in native, make sure that the treasury fee is not higher than the cap
                    uint gasFeeEstimate = tx.gasprice * treasuryGasCap;
                    // cap is the max of total fee and gasFeeEstimate. this is to prevent apps from forcing the cap to 0.
                    uint nativeFeeCap = _totalFee > gasFeeEstimate ? _totalFee : gasFeeEstimate;
                    // to prevent the treasury from returning an overly high value to break the path
                    nativeFee = treasuryFee > nativeFeeCap ? nativeFeeCap : treasuryFee;
                }
            } catch {
                // failure, something wrong with treasury contract, charge nothing and continue
            }
        }
    }
    function _transferNative(address _to, uint _amount) internal {
        (bool success, ) = _to.call{value: _amount}("");
        require(success, Errors.INVALID_STATE);
    }
    // for msg.sender only
    function _assertAndDebitAmount(address _to, uint _amount) internal {
        uint fee = fees[msg.sender];
        require(_to != address(0x0) && _amount <= fee, Errors.INVALID_ARGUMENT);
        unchecked {
            fees[msg.sender] = fee - _amount;
        }
    }
    function _setTreasury(address _treasury) internal {
        treasury = _treasury;
        emit TreasurySet(_treasury);
    }
    // ======================= Virtual =======================
    // For implementation to override
    function _quoteWorkers(
        address _oapp,
        uint32 _eid,
        WorkerOptions[] memory _options
    ) internal view virtual returns (uint nativeFee, address executor, uint maxMsgSize);
    function _getExecutorAndOtherOptions(
        bytes calldata _options
    ) internal view virtual returns (bytes memory executorOptions, WorkerOptions[] memory otherWorkerOptions);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.19;
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@layerzerolabs/lz-evm-protocol-v2/contracts/interfaces/IMessageLib.sol";
import "./interfaces/IWorker.sol";
abstract contract Worker is AccessControl, Pausable, IWorker {
    bytes32 internal constant MESSAGE_LIB_ROLE = keccak256("MESSAGE_LIB_ROLE");
    bytes32 internal constant ALLOWLIST = keccak256("ALLOWLIST");
    bytes32 internal constant DENYLIST = keccak256("DENYLIST");
    bytes32 internal constant ADMIN_ROLE = keccak256("ADMIN_ROLE");
    address public workerFeeLib;
    uint64 public allowlistSize;
    uint16 public defaultMultiplierBps;
    address public priceFeed;
    // ========================= Constructor =========================
    /// @param _messageLibs array of message lib addresses that are granted the MESSAGE_LIB_ROLE
    /// @param _priceFeed price feed address
    /// @param _defaultMultiplierBps default multiplier for worker fee
    /// @param _roleAdmin address that is granted the DEFAULT_ADMIN_ROLE (can grant and revoke all roles)
    /// @param _admins array of admin addresses that are granted the ADMIN_ROLE
    constructor(
        address[] memory _messageLibs,
        address _priceFeed,
        uint16 _defaultMultiplierBps,
        address _roleAdmin,
        address[] memory _admins
    ) {
        defaultMultiplierBps = _defaultMultiplierBps;
        priceFeed = _priceFeed;
        if (_roleAdmin != address(0x0)) {
            _grantRole(DEFAULT_ADMIN_ROLE, _roleAdmin); // _roleAdmin can grant and revoke all roles
        }
        for (uint i = 0; i < _messageLibs.length; ++i) {
            _grantRole(MESSAGE_LIB_ROLE, _messageLibs[i]);
        }
        for (uint i = 0; i < _admins.length; ++i) {
            _grantRole(ADMIN_ROLE, _admins[i]);
        }
    }
    // ========================= Modifier =========================
    modifier onlyAcl(address _sender) {
        require(hasAcl(_sender), "Worker: not allowed");
        _;
    }
    /// @dev Access control list using allowlist and denylist
    /// @dev 1) if one address is in the denylist -> deny
    /// @dev 2) else if address in the allowlist OR allowlist is empty (allows everyone)-> allow
    /// @dev 3) else deny
    /// @param _sender address to check
    function hasAcl(address _sender) public view returns (bool) {
        if (hasRole(DENYLIST, _sender)) {
            return false;
        } else if (allowlistSize == 0 || hasRole(ALLOWLIST, _sender)) {
            return true;
        } else {
            return false;
        }
    }
    // ========================= OnyDefaultAdmin =========================
    /// @dev flag to pause execution of workers (if used with whenNotPaused modifier)
    /// @param _paused true to pause, false to unpause
    function setPaused(bool _paused) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (_paused) {
            _pause();
        } else {
            _unpause();
        }
    }
    // ========================= OnlyAdmin =========================
    /// @param _priceFeed price feed address
    function setPriceFeed(address _priceFeed) external onlyRole(ADMIN_ROLE) {
        priceFeed = _priceFeed;
        emit SetPriceFeed(_priceFeed);
    }
    /// @param _workerFeeLib worker fee lib address
    function setWorkerFeeLib(address _workerFeeLib) external onlyRole(ADMIN_ROLE) {
        workerFeeLib = _workerFeeLib;
        emit SetWorkerLib(_workerFeeLib);
    }
    /// @param _multiplierBps default multiplier for worker fee
    function setDefaultMultiplierBps(uint16 _multiplierBps) external onlyRole(ADMIN_ROLE) {
        defaultMultiplierBps = _multiplierBps;
        emit SetDefaultMultiplierBps(_multiplierBps);
    }
    /// @dev supports withdrawing fee from ULN301, ULN302 and more
    /// @param _lib message lib address
    /// @param _to address to withdraw fee to
    /// @param _amount amount to withdraw
    function withdrawFee(address _lib, address _to, uint _amount) external onlyRole(ADMIN_ROLE) {
        require(hasRole(MESSAGE_LIB_ROLE, _lib), "Worker: Invalid message lib");
        IMessageLib(_lib).withdrawFee(_to, _amount);
        emit Withdraw(_lib, _to, _amount);
    }
    // ========================= Internal Functions =========================
    /// @dev overrides AccessControl to allow for counting of allowlistSize
    /// @param _role role to grant
    /// @param _account address to grant role to
    function _grantRole(bytes32 _role, address _account) internal override {
        if (_role == ALLOWLIST && !hasRole(_role, _account)) {
            ++allowlistSize;
        }
        super._grantRole(_role, _account);
    }
    /// @dev overrides AccessControl to allow for counting of allowlistSize
    /// @param _role role to revoke
    /// @param _account address to revoke role from
    function _revokeRole(bytes32 _role, address _account) internal override {
        if (_role == ALLOWLIST && hasRole(_role, _account)) {
            --allowlistSize;
        }
        super._revokeRole(_role, _account);
    }
    /// @dev overrides AccessControl to disable renouncing of roles
    function renounceRole(bytes32 /*role*/, address /*account*/) public pure override {
        revert("Worker: cannot renounce role");
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
interface ILayerZeroExecutor {
    // @notice query price and assign jobs at the same time
    // @param _dstEid - the destination endpoint identifier
    // @param _sender - the source sending contract address. executors may apply price discrimination to senders
    // @param _calldataSize - dynamic data size of message + caller params
    // @param _options - optional parameters for extra service plugins, e.g. sending dust tokens at the destination chain
    function assignJob(
        uint32 _dstEid,
        address _sender,
        uint _calldataSize,
        bytes calldata _options
    ) external payable returns (uint price);
    // @notice query the executor price for relaying the payload and its proof to the destination chain
    // @param _dstEid - the destination endpoint identifier
    // @param _sender - the source sending contract address. executors may apply price discrimination to senders
    // @param _calldataSize - dynamic data size of message + caller params
    // @param _options - optional parameters for extra service plugins, e.g. sending dust tokens at the destination chain
    function getFee(
        uint32 _dstEid,
        address _sender,
        uint _calldataSize,
        bytes calldata _options
    ) external view returns (uint price);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
interface ILayerZeroTreasury {
    function getFee(address _sender, uint32 _eid, uint _totalFee, bool _payInLzToken) external view returns (uint);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
interface IWorker {
    event SetWorkerLib(address workerLib);
    event SetPriceFeed(address priceFeed);
    event SetDefaultMultiplierBps(uint16 multiplierBps);
    event Withdraw(address lib, address to, uint amount);
    function setPriceFeed(address _priceFeed) external;
    function priceFeed() external view returns (address);
    function setDefaultMultiplierBps(uint16 _multiplierBps) external;
    function defaultMultiplierBps() external view returns (uint16);
    function withdrawFee(address _lib, address _to, uint _amount) external;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.19;
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
abstract contract MultiSig {
    enum Errors {
        NoError,
        SignatureError,
        DuplicatedSigner,
        SignerNotInCommittee
    }
    mapping(address signer => bool active) public signers;
    uint64 public signerSize;
    uint64 public quorum;
    event UpdateSigner(address _signer, bool _active);
    event UpdateQuorum(uint64 _quorum);
    modifier onlySigner() {
        require(signers[msg.sender], "MultiSig: caller must be signer");
        _;
    }
    constructor(address[] memory _signers, uint64 _quorum) {
        require(_signers.length >= _quorum && _quorum > 0, "MultiSig: signers too few");
        address lastSigner = address(0);
        for (uint i = 0; i < _signers.length; i++) {
            address signer = _signers[i];
            require(signer > lastSigner, "MultiSig: signers not sorted"); // to ensure no duplicates
            signers[signer] = true;
            lastSigner = signer;
        }
        signerSize = uint64(_signers.length);
        quorum = _quorum;
    }
    function _setSigner(address _signer, bool _active) internal {
        require(signers[_signer] != _active, "MultiSig: signer already in that state");
        signers[_signer] = _active;
        signerSize = _active ? signerSize + 1 : signerSize - 1;
        require(signerSize >= quorum, "MultiSig: committee size < threshold");
        emit UpdateSigner(_signer, _active);
    }
    function _setQuorum(uint64 _quorum) internal {
        require(_quorum <= signerSize && _quorum > 0, "MultiSig: invalid quorum");
        quorum = _quorum;
        emit UpdateQuorum(_quorum);
    }
    function verifySignatures(bytes32 _hash, bytes calldata _signatures) public view returns (bool, Errors) {
        if (_signatures.length != uint(quorum) * 65) {
            return (false, Errors.SignatureError);
        }
        bytes32 messageDigest = _getEthSignedMessageHash(_hash);
        address lastSigner = address(0); // There cannot be a signer with address 0.
        for (uint i = 0; i < quorum; i++) {
            bytes calldata signature = _signatures[i * 65:(i + 1) * 65];
            (address currentSigner, ECDSA.RecoverError error) = ECDSA.tryRecover(messageDigest, signature);
            if (error != ECDSA.RecoverError.NoError) return (false, Errors.SignatureError);
            if (currentSigner <= lastSigner) return (false, Errors.DuplicatedSigner); // prevent duplicate signatures
            if (!signers[currentSigner]) return (false, Errors.SignerNotInCommittee); // signature is not in committee
            lastSigner = currentSigner;
        }
        return (true, Errors.NoError);
    }
    function _getEthSignedMessageHash(bytes32 _messageHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\\x19Ethereum Signed Message:\
32", _messageHash));
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.19;
import "@layerzerolabs/lz-evm-v1-0.8/contracts/interfaces/ILayerZeroUltraLightNodeV2.sol";
import "../Worker.sol";
import "./MultiSig.sol";
import "./interfaces/IVerifier.sol";
import "./interfaces/IVerifierFeeLib.sol";
import "./interfaces/IUltraLightNode.sol";
import {DeliveryState} from "../MessageLibBase.sol";
struct ExecuteParam {
    uint32 vid;
    address target;
    bytes callData;
    uint expiration;
    bytes signatures;
}
contract VerifierNetwork is Worker, MultiSig, IVerifier {
    // to uniquely identify this VerifierNetwork instance
    // set to endpoint v1 eid if available OR endpoint v2 eid % 30_000
    uint32 public immutable vid;
    mapping(uint32 dstEid => DstConfig) public dstConfig;
    mapping(bytes32 executableHash => bool used) public usedHashes;
    event VerifySignaturesFailed(uint idx);
    event ExecuteFailed(uint _index, bytes _data);
    event HashAlreadyUsed(ExecuteParam param, bytes32 _hash);
    event VerifierFeePaid(uint fee);
    // ========================= Constructor =========================
    /// @dev VerifierNetwork doesn't have a roleAdmin (address(0x0))
    /// @dev Supports all of ULNv2, ULN301, ULN302 and more
    /// @param _messageLibs array of message lib addresses that are granted the MESSAGE_LIB_ROLE
    /// @param _priceFeed price feed address
    /// @param _signers array of signer addresses for multisig
    /// @param _quorum quorum for multisig
    /// @param _admins array of admin addresses that are granted the ADMIN_ROLE
    constructor(
        uint32 _vid,
        address[] memory _messageLibs,
        address _priceFeed,
        address[] memory _signers,
        uint64 _quorum,
        address[] memory _admins
    ) Worker(_messageLibs, _priceFeed, 12000, address(0x0), _admins) MultiSig(_signers, _quorum) {
        vid = _vid;
    }
    // ========================= Modifier =========================
    /// @dev depending on role, restrict access to only self or admin
    /// @dev ALLOWLIST, DENYLIST, MESSAGE_LIB_ROLE can only be granted/revoked by self
    /// @dev ADMIN_ROLE can only be granted/revoked by admin
    /// @dev reverts if not one of the above roles
    /// @param _role role to check
    modifier onlySelfOrAdmin(bytes32 _role) {
        if (_role == ALLOWLIST || _role == DENYLIST || _role == MESSAGE_LIB_ROLE) {
            // self required
            require(address(this) == msg.sender, "Verifier: caller must be self");
        } else if (_role == ADMIN_ROLE) {
            // admin required
            _checkRole(ADMIN_ROLE);
        } else {
            revert("Verifier: invalid role");
        }
        _;
    }
    modifier onlySelf() {
        require(address(this) == msg.sender, "Verifier: caller must be self");
        _;
    }
    // ========================= OnlySelf =========================
    /// @dev set signers for multisig
    /// @dev function sig 0x31cb6105
    /// @param _signer signer address
    /// @param _active true to add, false to remove
    function setSigner(address _signer, bool _active) external onlySelf {
        _setSigner(_signer, _active);
    }
    /// @dev set quorum for multisig
    /// @dev function sig 0x8585c945
    /// @param _quorum to set
    function setQuorum(uint64 _quorum) external onlySelf {
        _setQuorum(_quorum);
    }
    /// @dev one function to verify and deliver to ULN302 and more (does not support ULN301)
    /// @dev if last verifier, can use this function to save overhead gas on deliver
    /// @dev function sig 0xb724b133
    /// @param _uln IUltraLightNode compatible contract
    /// @param _packetHeader packet header
    /// @param _payloadHash payload hash
    /// @param _confirmations block confirmations
    function verifyAndDeliver(
        IUltraLightNode _uln,
        bytes calldata _packetHeader,
        bytes32 _payloadHash,
        uint64 _confirmations
    ) external onlySelf {
        require(hasRole(MESSAGE_LIB_ROLE, address(_uln)), "Verifier: invalid uln");
        _uln.verify(_packetHeader, _payloadHash, _confirmations);
        // if deliverable, deliver. else, skip or it will revert in uln
        if (_uln.deliverable(_packetHeader, _payloadHash) == DeliveryState.Deliverable) {
            _uln.deliver(_packetHeader, _payloadHash);
        }
    }
    // ========================= OnlySelf / OnlyAdmin =========================
    /// @dev overrides AccessControl to allow self/admin to grant role'
    /// @dev function sig 0x2f2ff15d
    /// @param _role role to grant
    /// @param _account account to grant role to
    function grantRole(bytes32 _role, address _account) public override onlySelfOrAdmin(_role) {
        _grantRole(_role, _account);
    }
    /// @dev overrides AccessControl to allow self/admin to revoke role
    /// @dev function sig 0xd547741f
    /// @param _role role to revoke
    /// @param _account account to revoke role from
    function revokeRole(bytes32 _role, address _account) public override onlySelfOrAdmin(_role) {
        _revokeRole(_role, _account);
    }
    // ========================= OnlyQuorum =========================
    // @notice function for quorum to change admin without going through execute function
    // @dev calldata in the case is abi.encode new admin address
    function quorumChangeAdmin(ExecuteParam calldata _param) external {
        require(_param.expiration > block.timestamp, "Verifier: expired");
        require(_param.target == address(this), "Verifier: invalid target");
        require(_param.vid == vid, "Verifier: invalid vid");
        // generate and validate hash
        bytes32 hash = hashCallData(_param.vid, _param.target, _param.callData, _param.expiration);
        (bool sigsValid, ) = verifySignatures(hash, _param.signatures);
        require(sigsValid, "Verifier: invalid signatures");
        require(!usedHashes[hash], "Verifier: hash already used");
        usedHashes[hash] = true;
        _grantRole(ADMIN_ROLE, abi.decode(_param.callData, (address)));
    }
    // ========================= OnlyAdmin =========================
    /// @param _params array of DstConfigParam
    function setDstConfig(DstConfigParam[] calldata _params) external onlyRole(ADMIN_ROLE) {
        for (uint i = 0; i < _params.length; ++i) {
            DstConfigParam calldata param = _params[i];
            dstConfig[param.dstEid] = DstConfig(param.gas, param.multiplierBps, param.floorMarginUSD);
        }
        emit SetDstConfig(_params);
    }
    /// @dev takes a list of instructions and executes them in order
    /// @dev if any of the instructions fail, it will emit an error event and continue to execute the rest of the instructions
    /// @param _params array of ExecuteParam, includes target, callData, expiration, signatures
    function execute(ExecuteParam[] calldata _params) external onlyRole(ADMIN_ROLE) {
        for (uint i = 0; i < _params.length; ++i) {
            ExecuteParam calldata param = _params[i];
            // 1. skip if invalid vid
            if (param.vid != vid) {
                continue;
            }
            // 2. skip if expired
            if (param.expiration <= block.timestamp) {
                continue;
            }
            // generate and validate hash
            bytes32 hash = hashCallData(param.vid, param.target, param.callData, param.expiration);
            // 3. check signatures
            (bool sigsValid, ) = verifySignatures(hash, param.signatures);
            if (!sigsValid) {
                emit VerifySignaturesFailed(i);
                continue;
            }
            // 4. should check hash
            bool shouldCheckHash = _shouldCheckHash(bytes4(param.callData));
            if (shouldCheckHash) {
                if (usedHashes[hash]) {
                    emit HashAlreadyUsed(param, hash);
                    continue;
                } else {
                    usedHashes[hash] = true; // prevent reentry and replay attack
                }
            }
            (bool success, bytes memory rtnData) = param.target.call(param.callData);
            if (!success) {
                if (shouldCheckHash) {
                    // need to unset the usedHash otherwise it cant be used
                    usedHashes[hash] = false;
                }
                // emit an event in any case
                emit ExecuteFailed(i, rtnData);
            }
        }
    }
    /// @dev to support ULNv2
    /// @dev the withdrawFee function for ULN30X is built in the Worker contract
    /// @param _lib message lib address
    /// @param _to address to withdraw to
    /// @param _amount amount to withdraw
    function withdrawFeeFromUlnV2(address _lib, address payable _to, uint _amount) external onlyRole(ADMIN_ROLE) {
        require(hasRole(MESSAGE_LIB_ROLE, _lib), "Verifier: Invalid message lib");
        ILayerZeroUltraLightNodeV2(_lib).withdrawNative(_to, _amount);
    }
    // ========================= OnlyMessageLib =========================
    /// @dev for ULN301, ULN302 and more to assign job
    /// @dev verifier network can reject job from _sender by adding/removing them from allowlist/denylist
    /// @param _param assign job param
    /// @param _options verifier options
    function assignJob(
        AssignJobParam calldata _param,
        bytes calldata _options
    ) external payable onlyRole(MESSAGE_LIB_ROLE) onlyAcl(_param.sender) returns (uint totalFee) {
        IVerifierFeeLib.FeeParams memory feeParams = IVerifierFeeLib.FeeParams(
            priceFeed,
            _param.dstEid,
            _param.confirmations,
            _param.sender,
            quorum,
            defaultMultiplierBps
        );
        totalFee = IVerifierFeeLib(workerFeeLib).getFeeOnSend(feeParams, dstConfig[_param.dstEid], _options);
    }
    /// @dev to support ULNv2
    /// @dev verifier network can reject job from _sender by adding/removing them from allowlist/denylist
    /// @param _dstEid destination EndpointId
    /// @param //_outboundProofType outbound proof type
    /// @param _confirmations block confirmations
    /// @param _sender message sender address
    function assignJob(
        uint16 _dstEid,
        uint16 /*_outboundProofType*/,
        uint64 _confirmations,
        address _sender
    ) external onlyRole(MESSAGE_LIB_ROLE) onlyAcl(_sender) returns (uint totalFee) {
        IVerifierFeeLib.FeeParams memory params = IVerifierFeeLib.FeeParams(
            priceFeed,
            _dstEid,
            _confirmations,
            _sender,
            quorum,
            defaultMultiplierBps
        );
        // ULNV2 does not have verifier options
        totalFee = IVerifierFeeLib(workerFeeLib).getFeeOnSend(params, dstConfig[_dstEid], bytes(""));
        emit VerifierFeePaid(totalFee);
    }
    // ========================= View =========================
    /// @dev getFee can revert if _sender doesn't pass ACL
    /// @param _dstEid destination EndpointId
    /// @param _confirmations block confirmations
    /// @param _sender message sender address
    /// @param _options verifier options
    /// @return fee fee in native amount
    function getFee(
        uint32 _dstEid,
        uint64 _confirmations,
        address _sender,
        bytes calldata _options
    ) external view onlyAcl(_sender) returns (uint fee) {
        IVerifierFeeLib.FeeParams memory params = IVerifierFeeLib.FeeParams(
            priceFeed,
            _dstEid,
            _confirmations,
            _sender,
            quorum,
            defaultMultiplierBps
        );
        return IVerifierFeeLib(workerFeeLib).getFee(params, dstConfig[_dstEid], _options);
    }
    /// @dev to support ULNv2
    /// @dev getFee can revert if _sender doesn't pass ACL
    /// @param _dstEid destination EndpointId
    /// @param //_outboundProofType outbound proof type
    /// @param _confirmations block confirmations
    /// @param _sender message sender address
    function getFee(
        uint16 _dstEid,
        uint16 /*_outboundProofType*/,
        uint64 _confirmations,
        address _sender
    ) public view onlyAcl(_sender) returns (uint fee) {
        IVerifierFeeLib.FeeParams memory params = IVerifierFeeLib.FeeParams(
            priceFeed,
            _dstEid,
            _confirmations,
            _sender,
            quorum,
            defaultMultiplierBps
        );
        return IVerifierFeeLib(workerFeeLib).getFee(params, dstConfig[_dstEid], bytes(""));
    }
    /// @param _target target address
    /// @param _callData call data
    /// @param _expiration expiration timestamp
    /// @return hash of above
    function hashCallData(
        uint32 _vid,
        address _target,
        bytes calldata _callData,
        uint _expiration
    ) public pure returns (bytes32) {
        return keccak256(abi.encodePacked(_vid, _target, _expiration, _callData));
    }
    // ========================= Internal =========================
    /// @dev to save gas, we don't check hash for some functions (where replaying won't change the state)
    /// @dev for example, some administrative functions like changing signers, the contract should check hash to double spending
    /// @dev should ensure that all onlySelf functions have unique functionSig
    /// @param _functionSig function signature
    /// @return true if should check hash
    function _shouldCheckHash(bytes4 _functionSig) internal pure returns (bool) {
        // never check for these selectors to save gas
        return
            _functionSig != IUltraLightNode.verify.selector && // 0x0223536e, replaying won't change the state
            _functionSig != this.verifyAndDeliver.selector && // 0xb724b133, replaying calls deliver on top of verify, which will be rejected at uln if not deliverable
            _functionSig != ILayerZeroUltraLightNodeV2.updateHash.selector; // 0x704316e5, replaying will be revert at uln
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
interface ILayerZeroVerifier {
    struct AssignJobParam {
        uint32 dstEid;
        bytes packetHeader;
        bytes32 payloadHash;
        uint64 confirmations;
        address sender;
    }
    // @notice query price and assign jobs at the same time
    // @param _dstEid - the destination endpoint identifier
    // @param _packetHeader - version + nonce + path
    // @param _payloadHash - hash of guid + message
    // @param _confirmations - block confirmation delay before relaying blocks
    // @param _sender - the source sending contract address
    // @param _options - options
    function assignJob(AssignJobParam calldata _param, bytes calldata _options) external payable returns (uint fee);
    // @notice query the verifier fee for relaying block information to the destination chain
    // @param _dstEid the destination endpoint identifier
    // @param _confirmations - block confirmation delay before relaying blocks
    // @param _sender - the source sending contract address
    // @param _options - options
    function getFee(
        uint32 _dstEid,
        uint64 _confirmations,
        address _sender,
        bytes calldata _options
    ) external view returns (uint fee);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
import {DeliveryState} from "../../MessageLibBase.sol";
interface IUltraLightNode {
    function verify(bytes calldata _packetHeader, bytes32 _payloadHash, uint64 _confirmations) external;
    function deliver(bytes calldata _packetHeader, bytes32 _payloadHash) external;
    function deliverable(bytes calldata _packetHeader, bytes32 _payloadHash) external view returns (DeliveryState);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
import "../../interfaces/IWorker.sol";
import "./ILayerZeroVerifier.sol";
interface IVerifier is IWorker, ILayerZeroVerifier {
    struct DstConfigParam {
        uint32 dstEid;
        uint64 gas;
        uint16 multiplierBps;
        uint128 floorMarginUSD;
    }
    struct DstConfig {
        uint64 gas;
        uint16 multiplierBps;
        uint128 floorMarginUSD; // uses priceFeed PRICE_RATIO_DENOMINATOR
    }
    event SetDstConfig(DstConfigParam[] params);
    function dstConfig(uint32 _dstEid) external view returns (uint64, uint16, uint128);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
import "./IVerifier.sol";
interface IVerifierFeeLib {
    struct FeeParams {
        address priceFeed;
        uint32 dstEid;
        uint64 confirmations;
        address sender;
        uint64 quorum;
        uint16 defaultMultiplierBps;
    }
    function getFeeOnSend(
        FeeParams memory _params,
        IVerifier.DstConfig memory _dstConfig,
        bytes memory _options
    ) external payable returns (uint fee);
    function getFee(
        FeeParams calldata _params,
        IVerifier.DstConfig calldata _dstConfig,
        bytes calldata _options
    ) external view returns (uint fee);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;
library CalldataBytesLib {
    function toU8(bytes calldata _bytes, uint _start) internal pure returns (uint8) {
        return uint8(_bytes[_start]);
    }
    function toU16(bytes calldata _bytes, uint _start) internal pure returns (uint16) {
        unchecked {
            uint end = _start + 2;
            return uint16(bytes2(_bytes[_start:end]));
        }
    }
    function toU32(bytes calldata _bytes, uint _start) internal pure returns (uint32) {
        unchecked {
            uint end = _start + 4;
            return uint32(bytes4(_bytes[_start:end]));
        }
    }
    function toU64(bytes calldata _bytes, uint _start) internal pure returns (uint64) {
        unchecked {
            uint end = _start + 8;
            return uint64(bytes8(_bytes[_start:end]));
        }
    }
    function toU128(bytes calldata _bytes, uint _start) internal pure returns (uint128) {
        unchecked {
            uint end = _start + 16;
            return uint128(bytes16(_bytes[_start:end]));
        }
    }
    function toU256(bytes calldata _bytes, uint _start) internal pure returns (uint256) {
        unchecked {
            uint end = _start + 32;
            return uint256(bytes32(_bytes[_start:end]));
        }
    }
    function toAddr(bytes calldata _bytes, uint _start) internal pure returns (address) {
        unchecked {
            uint end = _start + 20;
            return address(bytes20(_bytes[_start:end]));
        }
    }
    function toB32(bytes calldata _bytes, uint _start) internal pure returns (bytes32) {
        unchecked {
            uint end = _start + 32;
            return bytes32(_bytes[_start:end]);
        }
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;
library Errors {
    // Invalid Argument (http: 400)
    string internal constant INVALID_ARGUMENT = "LZ10000";
    string internal constant ONLY_REGISTERED = "LZ10001";
    string internal constant ONLY_REGISTERED_OR_DEFAULT = "LZ10002";
    string internal constant INVALID_AMOUNT = "LZ10003";
    string internal constant INVALID_NONCE = "LZ10004";
    string internal constant SAME_VALUE = "LZ10005";
    string internal constant UNSORTED = "LZ10006";
    string internal constant INVALID_VERSION = "LZ10007";
    string internal constant INVALID_EID = "LZ10008";
    string internal constant INVALID_SIZE = "LZ10009";
    string internal constant ONLY_NON_DEFAULT = "LZ10010";
    string internal constant INVALID_VERIFIERS = "LZ10011";
    string internal constant INVALID_WORKER_ID = "LZ10012";
    string internal constant DUPLICATED_OPTION = "LZ10013";
    string internal constant INVALID_LEGACY_OPTION = "LZ10014";
    string internal constant INVALID_VERIFIER_OPTION = "LZ10015";
    string internal constant INVALID_WORKER_OPTIONS = "LZ10016";
    string internal constant INVALID_EXECUTOR_OPTION = "LZ10017";
    string internal constant INVALID_ADDRESS = "LZ10018";
    // Out of Range (http: 400)
    string internal constant OUT_OF_RANGE = "LZ20000";
    // Invalid State (http: 400)
    string internal constant INVALID_STATE = "LZ30000";
    string internal constant SEND_REENTRANCY = "LZ30001";
    string internal constant RECEIVE_REENTRANCY = "LZ30002";
    string internal constant COMPOSE_REENTRANCY = "LZ30003";
    // Permission Denied (http: 403)
    string internal constant PERMISSION_DENIED = "LZ50000";
    // Not Found (http: 404)
    string internal constant NOT_FOUND = "LZ60000";
    // Already Exists (http: 409)
    string internal constant ALREADY_EXISTS = "LZ80000";
    // Not Implemented (http: 501)
    string internal constant NOT_IMPLEMENTED = "LZC0000";
    string internal constant UNSUPPORTED_INTERFACE = "LZC0001";
    string internal constant UNSUPPORTED_OPTION_TYPE = "LZC0002";
    // Unavailable (http: 503)
    string internal constant UNAVAILABLE = "LZD0000";
    string internal constant NATIVE_COIN_UNAVAILABLE = "LZD0001";
    string internal constant TOKEN_UNAVAILABLE = "LZD0002";
    string internal constant DEFAULT_LIBRARY_UNAVAILABLE = "LZD0003";
    string internal constant VERIFIERS_UNAVAILABLE = "LZD0004";
}
// SPDX-License-Identifier: BUSL-1.1
// modified from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/structs/BitMaps.sol
pragma solidity ^0.8.19;
library BitMaps {
    type BitMap256 is uint;
    /**
     * @dev Returns whether the bit at `index` is set.
     */
    function get(BitMap256 bitmap, uint8 index) internal pure returns (bool) {
        uint256 mask = 1 << index;
        return BitMap256.unwrap(bitmap) & mask != 0;
    }
    /**
     * @dev Sets the bit at `index`.
     */
    function set(BitMap256 bitmap, uint8 index) internal pure returns (BitMap256) {
        uint256 mask = 1 << index;
        return BitMap256.wrap(BitMap256.unwrap(bitmap) | mask);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
interface ILayerZeroPriceFeed {
    /**
     * @dev
     * priceRatio: (USD price of 1 unit of remote native token in unit of local native token) * PRICE_RATIO_DENOMINATOR
     */
    struct Price {
        uint128 priceRatio; // float value * 10 ^ 20, decimal awared. for aptos to evm, the basis would be (10^18 / 10^8) * 10 ^20 = 10 ^ 30.
        uint64 gasPriceInUnit; // for evm, it is in wei, for aptos, it is in octas.
        uint32 gasPerByte;
    }
    struct UpdatePrice {
        uint32 eid;
        Price price;
    }
    /**
     * @dev
     *    ArbGasInfo.go:GetPricesInArbGas
     *
     */
    struct ArbitrumPriceExt {
        uint64 gasPerL2Tx; // L2 overhead
        uint32 gasPerL1CallDataByte;
    }
    struct UpdatePriceExt {
        uint32 eid;
        Price price;
        ArbitrumPriceExt extend;
    }
    function nativeTokenPriceUSD() external view returns (uint128);
    function getFee(uint32 _dstEid, uint _callDataSize, uint _gas) external view returns (uint);
    function getPrice(uint32 _dstEid) external view returns (Price memory);
    function getPriceRatioDenominator() external view returns (uint128);
    function estimateFeeByEid(
        uint32 _dstEid,
        uint _callDataSize,
        uint _gas
    ) external view returns (uint fee, uint128 priceRatio, uint128 priceRatioDenominator, uint128 nativePriceUSD);
    function estimateFeeOnSend(
        uint32 _dstEid,
        uint _callDataSize,
        uint _gas
    ) external payable returns (uint fee, uint128 priceRatio, uint128 priceRatioDenominator, uint128 nativePriceUSD);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
interface IWorker {
    event SetWorkerLib(address workerLib);
    event SetPriceFeed(address priceFeed);
    event SetDefaultMultiplierBps(uint16 multiplierBps);
    event Withdraw(address lib, address to, uint amount);
    function setPriceFeed(address _priceFeed) external;
    function priceFeed() external view returns (address);
    function setDefaultMultiplierBps(uint16 _multiplierBps) external;
    function defaultMultiplierBps() external view returns (uint16);
    function withdrawFee(address _lib, address _to, uint _amount) external;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.19;
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";
import "@layerzerolabs/lz-evm-protocol-v2/contracts/messagelib/libs/BitMaps.sol";
import "../interfaces/ILayerZeroPriceFeed.sol";
import "./interfaces/IVerifier.sol";
import "./interfaces/IVerifierFeeLib.sol";
import "./libs/VerifierOptions.sol";
contract VerifierFeeLib is IVerifierFeeLib {
    using BitMaps for BitMaps.BitMap256;
    using VerifierOptions for bytes;
    uint16 internal constant EXECUTE_FIXED_BYTES = 68; // encoded: funcSigHash + params -> 4  + (32 * 2)
    uint16 internal constant SIGNATURE_RAW_BYTES = 65; // not encoded
    // callData(updateHash) = 132 (4 + 32 * 4), padded to 32 = 160 and encoded as bytes with an 64 byte overhead = 224
    uint16 internal constant UPDATE_HASH_BYTES = 224;
    uint internal constant NATIVE_DECIMALS_RATE = 1e18;
    // ========================= External =========================
    /// @dev get fee function that can change state. e.g. paying priceFeed
    /// @param _params fee params
    /// @param _dstConfig dst config
    /// @param //_options options
    function getFeeOnSend(
        FeeParams memory _params,
        IVerifier.DstConfig memory _dstConfig,
        bytes memory /* _options */
    ) external payable returns (uint) {
        uint callDataSize = _getCallDataSize(_params.quorum);
        // for future versions where priceFeed charges a fee
        //        uint priceFeedFee = ILayerZeroPriceFeed(_params.priceFeed).getFee(_params.dstEid, callDataSize, _dstConfig.gas);
        //        (uint fee, , , uint128 nativePriceUSD) = ILayerZeroPriceFeed(_params.priceFeed).estimateFeeOnSend{
        //            value: priceFeedFee
        //        }(_params.dstEid, callDataSize, _dstConfig.gas);
        (uint fee, , , uint128 nativePriceUSD) = ILayerZeroPriceFeed(_params.priceFeed).estimateFeeOnSend(
            _params.dstEid,
            callDataSize,
            _dstConfig.gas
        );
        return
            _applyPremium(
                fee,
                _dstConfig.multiplierBps,
                _params.defaultMultiplierBps,
                _dstConfig.floorMarginUSD,
                nativePriceUSD
            );
    }
    // ========================= View =========================
    /// @dev get fee view function
    /// @param _params fee params
    /// @param _dstConfig dst config
    /// @param //_options options
    function getFee(
        FeeParams calldata _params,
        IVerifier.DstConfig calldata _dstConfig,
        bytes calldata /* _options */
    ) external view returns (uint) {
        uint callDataSize = _getCallDataSize(_params.quorum);
        (uint fee, , , uint128 nativePriceUSD) = ILayerZeroPriceFeed(_params.priceFeed).estimateFeeByEid(
            _params.dstEid,
            callDataSize,
            _dstConfig.gas
        );
        return
            _applyPremium(
                fee,
                _dstConfig.multiplierBps,
                _params.defaultMultiplierBps,
                _dstConfig.floorMarginUSD,
                nativePriceUSD
            );
    }
    // ========================= Internal =========================
    function _getCallDataSize(uint _quorum) internal pure returns (uint) {
        uint totalSignatureBytes = _quorum * SIGNATURE_RAW_BYTES;
        if (totalSignatureBytes % 32 != 0) {
            totalSignatureBytes = totalSignatureBytes - (totalSignatureBytes % 32) + 32;
        }
        // getFee should charge on execute(updateHash)
        // totalSignatureBytesPadded also has 64 overhead for bytes
        return uint(EXECUTE_FIXED_BYTES) + UPDATE_HASH_BYTES + totalSignatureBytes + 64;
    }
    function _applyPremium(
        uint _fee,
        uint16 _bps,
        uint16 _defaultBps,
        uint128 _marginUSD,
        uint128 _nativePriceUSD
    ) internal pure returns (uint) {
        uint16 multiplierBps = _bps == 0 ? _defaultBps : _bps;
        uint feeWithMultiplier = (_fee * multiplierBps) / 10000;
        if (_nativePriceUSD == 0 || _marginUSD == 0) {
            return feeWithMultiplier;
        }
        uint feeWithFloorMargin = _fee + (_marginUSD * NATIVE_DECIMALS_RATE) / _nativePriceUSD;
        return feeWithFloorMargin > feeWithMultiplier ? feeWithFloorMargin : feeWithMultiplier;
    }
    // todo: add to getFee and getFeeOnSend
    function _decodeVerifierOptions(bytes calldata _options) internal pure returns (uint totalFee) {
        BitMaps.BitMap256 bitmap;
        uint cursor;
        while (cursor < _options.length) {
            (uint8 optionType, , uint newCursor) = _options.nextVerifierOption(cursor);
            cursor = newCursor;
            // check if option type is duplicated
            require(!bitmap.get(optionType), Errors.DUPLICATED_OPTION);
            bitmap = bitmap.set(optionType);
            if (optionType == VerifierOptions.OPTION_TYPE_PRECRIME) {
                totalFee += 100; //todo: confirm fee
            } else {
                revert("VerifierFeeLib: invalid option type");
            }
        }
        require(cursor == _options.length, Errors.INVALID_VERIFIER_OPTION);
    }
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
interface ILayerZeroVerifier {
    struct AssignJobParam {
        uint32 dstEid;
        bytes packetHeader;
        bytes32 payloadHash;
        uint64 confirmations;
        address sender;
    }
    // @notice query price and assign jobs at the same time
    // @param _dstEid - the destination endpoint identifier
    // @param _packetHeader - version + nonce + path
    // @param _payloadHash - hash of guid + message
    // @param _confirmations - block confirmation delay before relaying blocks
    // @param _sender - the source sending contract address
    // @param _options - options
    function assignJob(AssignJobParam calldata _param, bytes calldata _options) external payable returns (uint fee);
    // @notice query the verifier fee for relaying block information to the destination chain
    // @param _dstEid the destination endpoint identifier
    // @param _confirmations - block confirmation delay before relaying blocks
    // @param _sender - the source sending contract address
    // @param _options - options
    function getFee(
        uint32 _dstEid,
        uint64 _confirmations,
        address _sender,
        bytes calldata _options
    ) external view returns (uint fee);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
import "../../interfaces/IWorker.sol";
import "./ILayerZeroVerifier.sol";
interface IVerifier is IWorker, ILayerZeroVerifier {
    struct DstConfigParam {
        uint32 dstEid;
        uint64 gas;
        uint16 multiplierBps;
        uint128 floorMarginUSD;
    }
    struct DstConfig {
        uint64 gas;
        uint16 multiplierBps;
        uint128 floorMarginUSD; // uses priceFeed PRICE_RATIO_DENOMINATOR
    }
    event SetDstConfig(DstConfigParam[] params);
    function dstConfig(uint32 _dstEid) external view returns (uint64, uint16, uint128);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.0;
import "./IVerifier.sol";
interface IVerifierFeeLib {
    struct FeeParams {
        address priceFeed;
        uint32 dstEid;
        uint64 confirmations;
        address sender;
        uint64 quorum;
        uint16 defaultMultiplierBps;
    }
    function getFeeOnSend(
        FeeParams memory _params,
        IVerifier.DstConfig memory _dstConfig,
        bytes memory _options
    ) external payable returns (uint fee);
    function getFee(
        FeeParams calldata _params,
        IVerifier.DstConfig calldata _dstConfig,
        bytes calldata _options
    ) external view returns (uint fee);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;
import "solidity-bytes-utils/contracts/BytesLib.sol";
import "@layerzerolabs/lz-evm-protocol-v2/contracts/messagelib/libs/BitMaps.sol";
import "@layerzerolabs/lz-evm-protocol-v2/contracts/libs/Errors.sol";
import "@layerzerolabs/lz-evm-protocol-v2/contracts/libs/CalldataBytesLib.sol";
library VerifierOptions {
    using BitMaps for BitMaps.BitMap256;
    using CalldataBytesLib for bytes;
    using BytesLib for bytes;
    uint8 internal constant WORKER_ID = 2;
    uint8 internal constant OPTION_TYPE_PRECRIME = 1;
    /// @dev group verifier options by its idx
    /// @param _options [verifier_id][verifier_option][verifier_id][verifier_option]...
    ///        verifier_option = [option_size][verifier_idx][option_type][option]
    ///        option_size = len(verifier_idx) + len(option_type) + len(option)
    ///        verifier_id: uint8, verifier_idx: uint8, option_size: uint16, option_type: uint8, option: bytes
    /// @return verifierOptions the grouped options, still share the same format of _options
    /// @return verifierIndices the verifier indices
    function groupVerifierOptionsByIdx(
        bytes memory _options
    ) internal pure returns (bytes[] memory verifierOptions, uint8[] memory verifierIndices) {
        if (_options.length == 0) return (verifierOptions, verifierIndices);
        uint8 numVerifiers = getNumVerifiers(_options);
        // if there is only 1 verifier, we can just return the whole options
        if (numVerifiers == 1) {
            verifierOptions = new bytes[](1);
            verifierOptions[0] = _options;
            verifierIndices = new uint8[](1);
            verifierIndices[0] = _options.toUint8(3); // verifier idx
            return (verifierOptions, verifierIndices);
        }
        // otherwise, we need to group the options by verifier_idx
        verifierIndices = new uint8[](numVerifiers);
        verifierOptions = new bytes[](numVerifiers);
        unchecked {
            uint cursor;
            uint start;
            uint8 lastVerifierIdx = 255; // 255 is an invalid verifier_idx
            while (cursor < _options.length) {
                ++cursor; // skip worker_id
                // optionLength asserted in getNumVerifiers (skip check)
                uint16 optionLength = _options.toUint16(cursor);
                cursor += 2;
                // verifierIdx asserted in getNumVerifiers (skip check)
                uint8 verifierIdx = _options.toUint8(cursor);
                // verifierIdx must equal to the lastVerifierIdx for the first option
                // so it is always skipped in the first option
                // this operation slices out options whenever the scan finds a different lastVerifierIdx
                if (lastVerifierIdx == 255) {
                    lastVerifierIdx = verifierIdx;
                } else if (verifierIdx != lastVerifierIdx) {
                    uint len = cursor - start - 3; // 3 is for worker_id and option_length
                    bytes memory opt = _options.slice(start, len);
                    _insertVerifierOptions(verifierOptions, verifierIndices, lastVerifierIdx, opt);
                    // reset the start and lastVerifierIdx
                    start += len;
                    lastVerifierIdx = verifierIdx;
                }
                cursor += optionLength;
            }
            // skip check the cursor here because the cursor is asserted in getNumVerifiers
            // if we have reached the end of the options, we need to process the last verifier
            uint size = cursor - start;
            bytes memory op = _options.slice(start, size);
            _insertVerifierOptions(verifierOptions, verifierIndices, lastVerifierIdx, op);
            // revert verifierIndices to start from 0
            for (uint8 i = 0; i < numVerifiers; ++i) {
                --verifierIndices[i];
            }
        }
    }
    function _insertVerifierOptions(
        bytes[] memory _verifierOptions,
        uint8[] memory _verifierIndices,
        uint8 _verifierIdx,
        bytes memory _newOptions
    ) internal pure {
        unchecked {
            // verifierIdx starts from 0 but default value of verifierIndices is 0,
            // so we tell if the slot is empty by adding 1 to verifierIdx
            require(_verifierIdx < 255, Errors.INVALID_VERIFIERS);
            uint8 verifierIdxAdj = _verifierIdx + 1;
            for (uint8 j = 0; j < _verifierIndices.length; ++j) {
                uint8 index = _verifierIndices[j];
                if (verifierIdxAdj == index) {
                    _verifierOptions[j] = abi.encodePacked(_verifierOptions[j], _newOptions);
                    break;
                } else if (index == 0) {
                    // empty slot, that means it is the first time we see this verifier
                    _verifierIndices[j] = verifierIdxAdj;
                    _verifierOptions[j] = _newOptions;
                    break;
                }
            }
        }
    }
    /// @dev get the number of unique verifiers
    /// @param _options the format is the same as groupVerifierOptionsByIdx
    function getNumVerifiers(bytes memory _options) internal pure returns (uint8 numVerifiers) {
        uint cursor;
        BitMaps.BitMap256 bitmap;
        // find number of unique verifier_idx
        unchecked {
            while (cursor < _options.length) {
                ++cursor; // skip worker_id
                uint16 optionLength = _options.toUint16(cursor);
                cursor += 2;
                require(optionLength >= 2, Errors.INVALID_VERIFIER_OPTION); // at least 1 byte for verifier_idx and 1 byte for option_type
                uint8 verifierIdx = _options.toUint8(cursor);
                // if verifierIdx is not set, increment numVerifiers
                // max num of verifiers is 255, 255 is an invalid verifier_idx
                require(verifierIdx < 255, Errors.INVALID_VERIFIERS);
                if (!bitmap.get(verifierIdx)) {
                    ++numVerifiers;
                    bitmap = bitmap.set(verifierIdx);
                }
                cursor += optionLength;
            }
        }
        require(cursor == _options.length, Errors.INVALID_VERIFIER_OPTION);
    }
    /// @dev decode the next verifier option from _options starting from the specified cursor
    /// @param _options the format is the same as groupVerifierOptionsByIdx
    /// @param _cursor the cursor to start decoding
    /// @return optionType the type of the option
    /// @return option the option
    /// @return cursor the cursor to start decoding the next option
    function nextVerifierOption(
        bytes calldata _options,
        uint _cursor
    ) internal pure returns (uint8 optionType, bytes calldata option, uint cursor) {
        unchecked {
            // skip worker id
            cursor = _cursor + 1;
            // read option size
            uint16 size = _options.toU16(cursor);
            cursor += 2;
            // read option type
            optionType = _options.toU8(cursor + 1); // skip verifier_idx
            // startCursor and endCursor are used to slice the option from _options
            uint startCursor = cursor + 2; // skip option type and verifier_idx
            uint endCursor = cursor + size;
            option = _options[startCursor:endCursor];
            cursor += size;
        }
    }
}
// SPDX-License-Identifier: Unlicense
/*
 * @title Solidity Bytes Arrays Utils
 * @author Gonçalo Sá <[email protected]>
 *
 * @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity.
 *      The library lets you concatenate, slice and type cast bytes arrays both in memory and storage.
 */
pragma solidity >=0.8.0 <0.9.0;
library BytesLib {
    function concat(
        bytes memory _preBytes,
        bytes memory _postBytes
    )
        internal
        pure
        returns (bytes memory)
    {
        bytes memory tempBytes;
        assembly {
            // Get a location of some free memory and store it in tempBytes as
            // Solidity does for memory variables.
            tempBytes := mload(0x40)
            // Store the length of the first bytes array at the beginning of
            // the memory for tempBytes.
            let length := mload(_preBytes)
            mstore(tempBytes, length)
            // Maintain a memory counter for the current write location in the
            // temp bytes array by adding the 32 bytes for the array length to
            // the starting location.
            let mc := add(tempBytes, 0x20)
            // Stop copying when the memory counter reaches the length of the
            // first bytes array.
            let end := add(mc, length)
            for {
                // Initialize a copy counter to the start of the _preBytes data,
                // 32 bytes into its memory.
                let cc := add(_preBytes, 0x20)
            } lt(mc, end) {
                // Increase both counters by 32 bytes each iteration.
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } {
                // Write the _preBytes data into the tempBytes memory 32 bytes
                // at a time.
                mstore(mc, mload(cc))
            }
            // Add the length of _postBytes to the current length of tempBytes
            // and store it as the new length in the first 32 bytes of the
            // tempBytes memory.
            length := mload(_postBytes)
            mstore(tempBytes, add(length, mload(tempBytes)))
            // Move the memory counter back from a multiple of 0x20 to the
            // actual end of the _preBytes data.
            mc := end
            // Stop copying when the memory counter reaches the new combined
            // length of the arrays.
            end := add(mc, length)
            for {
                let cc := add(_postBytes, 0x20)
            } lt(mc, end) {
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } {
                mstore(mc, mload(cc))
            }
            // Update the free-memory pointer by padding our last write location
            // to 32 bytes: add 31 bytes to the end of tempBytes to move to the
            // next 32 byte block, then round down to the nearest multiple of
            // 32. If the sum of the length of the two arrays is zero then add
            // one before rounding down to leave a blank 32 bytes (the length block with 0).
            mstore(0x40, and(
              add(add(end, iszero(add(length, mload(_preBytes)))), 31),
              not(31) // Round down to the nearest 32 bytes.
            ))
        }
        return tempBytes;
    }
    function concatStorage(bytes storage _preBytes, bytes memory _postBytes) internal {
        assembly {
            // Read the first 32 bytes of _preBytes storage, which is the length
            // of the array. (We don't need to use the offset into the slot
            // because arrays use the entire slot.)
            let fslot := sload(_preBytes.slot)
            // Arrays of 31 bytes or less have an even value in their slot,
            // while longer arrays have an odd value. The actual length is
            // the slot divided by two for odd values, and the lowest order
            // byte divided by two for even values.
            // If the slot is even, bitwise and the slot with 255 and divide by
            // two to get the length. If the slot is odd, bitwise and the slot
            // with -1 and divide by two.
            let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)
            let mlength := mload(_postBytes)
            let newlength := add(slength, mlength)
            // slength can contain both the length and contents of the array
            // if length < 32 bytes so let's prepare for that
            // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage
            switch add(lt(slength, 32), lt(newlength, 32))
            case 2 {
                // Since the new array still fits in the slot, we just need to
                // update the contents of the slot.
                // uint256(bytes_storage) = uint256(bytes_storage) + uint256(bytes_memory) + new_length
                sstore(
                    _preBytes.slot,
                    // all the modifications to the slot are inside this
                    // next block
                    add(
                        // we can just add to the slot contents because the
                        // bytes we want to change are the LSBs
                        fslot,
                        add(
                            mul(
                                div(
                                    // load the bytes from memory
                                    mload(add(_postBytes, 0x20)),
                                    // zero all bytes to the right
                                    exp(0x100, sub(32, mlength))
                                ),
                                // and now shift left the number of bytes to
                                // leave space for the length in the slot
                                exp(0x100, sub(32, newlength))
                            ),
                            // increase length by the double of the memory
                            // bytes length
                            mul(mlength, 2)
                        )
                    )
                )
            }
            case 1 {
                // The stored value fits in the slot, but the combined value
                // will exceed it.
                // get the keccak hash to get the contents of the array
                mstore(0x0, _preBytes.slot)
                let sc := add(keccak256(0x0, 0x20), div(slength, 32))
                // save new length
                sstore(_preBytes.slot, add(mul(newlength, 2), 1))
                // The contents of the _postBytes array start 32 bytes into
                // the structure. Our first read should obtain the `submod`
                // bytes that can fit into the unused space in the last word
                // of the stored array. To get this, we read 32 bytes starting
                // from `submod`, so the data we read overlaps with the array
                // contents by `submod` bytes. Masking the lowest-order
                // `submod` bytes allows us to add that value directly to the
                // stored value.
                let submod := sub(32, slength)
                let mc := add(_postBytes, submod)
                let end := add(_postBytes, mlength)
                let mask := sub(exp(0x100, submod), 1)
                sstore(
                    sc,
                    add(
                        and(
                            fslot,
                            0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00
                        ),
                        and(mload(mc), mask)
                    )
                )
                for {
                    mc := add(mc, 0x20)
                    sc := add(sc, 1)
                } lt(mc, end) {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } {
                    sstore(sc, mload(mc))
                }
                mask := exp(0x100, sub(mc, end))
                sstore(sc, mul(div(mload(mc), mask), mask))
            }
            default {
                // get the keccak hash to get the contents of the array
                mstore(0x0, _preBytes.slot)
                // Start copying to the last used word of the stored array.
                let sc := add(keccak256(0x0, 0x20), div(slength, 32))
                // save new length
                sstore(_preBytes.slot, add(mul(newlength, 2), 1))
                // Copy over the first `submod` bytes of the new data as in
                // case 1 above.
                let slengthmod := mod(slength, 32)
                let mlengthmod := mod(mlength, 32)
                let submod := sub(32, slengthmod)
                let mc := add(_postBytes, submod)
                let end := add(_postBytes, mlength)
                let mask := sub(exp(0x100, submod), 1)
                sstore(sc, add(sload(sc), and(mload(mc), mask)))
                for {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } lt(mc, end) {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } {
                    sstore(sc, mload(mc))
                }
                mask := exp(0x100, sub(mc, end))
                sstore(sc, mul(div(mload(mc), mask), mask))
            }
        }
    }
    function slice(
        bytes memory _bytes,
        uint256 _start,
        uint256 _length
    )
        internal
        pure
        returns (bytes memory)
    {
        require(_length + 31 >= _length, "slice_overflow");
        require(_bytes.length >= _start + _length, "slice_outOfBounds");
        bytes memory tempBytes;
        assembly {
            switch iszero(_length)
            case 0 {
                // Get a location of some free memory and store it in tempBytes as
                // Solidity does for memory variables.
                tempBytes := mload(0x40)
                // The first word of the slice result is potentially a partial
                // word read from the original array. To read it, we calculate
                // the length of that partial word and start copying that many
                // bytes into the array. The first word we copy will start with
                // data we don't care about, but the last `lengthmod` bytes will
                // land at the beginning of the contents of the new array. When
                // we're done copying, we overwrite the full first word with
                // the actual length of the slice.
                let lengthmod := and(_length, 31)
                // The multiplication in the next line is necessary
                // because when slicing multiples of 32 bytes (lengthmod == 0)
                // the following copy loop was copying the origin's length
                // and then ending prematurely not copying everything it should.
                let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod)))
                let end := add(mc, _length)
                for {
                    // The multiplication in the next line has the same exact purpose
                    // as the one above.
                    let cc := add(add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))), _start)
                } lt(mc, end) {
                    mc := add(mc, 0x20)
                    cc := add(cc, 0x20)
                } {
                    mstore(mc, mload(cc))
                }
                mstore(tempBytes, _length)
                //update free-memory pointer
                //allocating the array padded to 32 bytes like the compiler does now
                mstore(0x40, and(add(mc, 31), not(31)))
            }
            //if we want a zero-length slice let's just return a zero-length array
            default {
                tempBytes := mload(0x40)
                //zero out the 32 bytes slice we are about to return
                //we need to do it because Solidity does not garbage collect
                mstore(tempBytes, 0)
                mstore(0x40, add(tempBytes, 0x20))
            }
        }
        return tempBytes;
    }
    function toAddress(bytes memory _bytes, uint256 _start) internal pure returns (address) {
        require(_bytes.length >= _start + 20, "toAddress_outOfBounds");
        address tempAddress;
        assembly {
            tempAddress := div(mload(add(add(_bytes, 0x20), _start)), 0x1000000000000000000000000)
        }
        return tempAddress;
    }
    function toUint8(bytes memory _bytes, uint256 _start) internal pure returns (uint8) {
        require(_bytes.length >= _start + 1 , "toUint8_outOfBounds");
        uint8 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0x1), _start))
        }
        return tempUint;
    }
    function toUint16(bytes memory _bytes, uint256 _start) internal pure returns (uint16) {
        require(_bytes.length >= _start + 2, "toUint16_outOfBounds");
        uint16 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0x2), _start))
        }
        return tempUint;
    }
    function toUint32(bytes memory _bytes, uint256 _start) internal pure returns (uint32) {
        require(_bytes.length >= _start + 4, "toUint32_outOfBounds");
        uint32 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0x4), _start))
        }
        return tempUint;
    }
    function toUint64(bytes memory _bytes, uint256 _start) internal pure returns (uint64) {
        require(_bytes.length >= _start + 8, "toUint64_outOfBounds");
        uint64 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0x8), _start))
        }
        return tempUint;
    }
    function toUint96(bytes memory _bytes, uint256 _start) internal pure returns (uint96) {
        require(_bytes.length >= _start + 12, "toUint96_outOfBounds");
        uint96 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0xc), _start))
        }
        return tempUint;
    }
    function toUint128(bytes memory _bytes, uint256 _start) internal pure returns (uint128) {
        require(_bytes.length >= _start + 16, "toUint128_outOfBounds");
        uint128 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0x10), _start))
        }
        return tempUint;
    }
    function toUint256(bytes memory _bytes, uint256 _start) internal pure returns (uint256) {
        require(_bytes.length >= _start + 32, "toUint256_outOfBounds");
        uint256 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0x20), _start))
        }
        return tempUint;
    }
    function toBytes32(bytes memory _bytes, uint256 _start) internal pure returns (bytes32) {
        require(_bytes.length >= _start + 32, "toBytes32_outOfBounds");
        bytes32 tempBytes32;
        assembly {
            tempBytes32 := mload(add(add(_bytes, 0x20), _start))
        }
        return tempBytes32;
    }
    function equal(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bool) {
        bool success = true;
        assembly {
            let length := mload(_preBytes)
            // if lengths don't match the arrays are not equal
            switch eq(length, mload(_postBytes))
            case 1 {
                // cb is a circuit breaker in the for loop since there's
                //  no said feature for inline assembly loops
                // cb = 1 - don't breaker
                // cb = 0 - break
                let cb := 1
                let mc := add(_preBytes, 0x20)
                let end := add(mc, length)
                for {
                    let cc := add(_postBytes, 0x20)
                // the next line is the loop condition:
                // while(uint256(mc < end) + cb == 2)
                } eq(add(lt(mc, end), cb), 2) {
                    mc := add(mc, 0x20)
                    cc := add(cc, 0x20)
                } {
                    // if any of these checks fails then arrays are not equal
                    if iszero(eq(mload(mc), mload(cc))) {
                        // unsuccess:
                        success := 0
                        cb := 0
                    }
                }
            }
            default {
                // unsuccess:
                success := 0
            }
        }
        return success;
    }
    function equalStorage(
        bytes storage _preBytes,
        bytes memory _postBytes
    )
        internal
        view
        returns (bool)
    {
        bool success = true;
        assembly {
            // we know _preBytes_offset is 0
            let fslot := sload(_preBytes.slot)
            // Decode the length of the stored array like in concatStorage().
            let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)
            let mlength := mload(_postBytes)
            // if lengths don't match the arrays are not equal
            switch eq(slength, mlength)
            case 1 {
                // slength can contain both the length and contents of the array
                // if length < 32 bytes so let's prepare for that
                // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage
                if iszero(iszero(slength)) {
                    switch lt(slength, 32)
                    case 1 {
                        // blank the last byte which is the length
                        fslot := mul(div(fslot, 0x100), 0x100)
                        if iszero(eq(fslot, mload(add(_postBytes, 0x20)))) {
                            // unsuccess:
                            success := 0
                        }
                    }
                    default {
                        // cb is a circuit breaker in the for loop since there's
                        //  no said feature for inline assembly loops
                        // cb = 1 - don't breaker
                        // cb = 0 - break
                        let cb := 1
                        // get the keccak hash to get the contents of the array
                        mstore(0x0, _preBytes.slot)
                        let sc := keccak256(0x0, 0x20)
                        let mc := add(_postBytes, 0x20)
                        let end := add(mc, mlength)
                        // the next line is the loop condition:
                        // while(uint256(mc < end) + cb == 2)
                        for {} eq(add(lt(mc, end), cb), 2) {
                            sc := add(sc, 1)
                            mc := add(mc, 0x20)
                        } {
                            if iszero(eq(sload(sc), mload(mc))) {
                                // unsuccess:
                                success := 0
                                cb := 0
                            }
                        }
                    }
                }
            }
            default {
                // unsuccess:
                success := 0
            }
        }
        return success;
    }
}