// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
error TokenAddressIsZero();
error TokenNotSupported();
error CannotBridgeToSameNetwork();
error ZeroPostSwapBalance();
error NoSwapDataProvided();
error NativeValueWithERC();
error ContractCallNotAllowed();
error NullAddrIsNotAValidSpender();
error NullAddrIsNotAnERC20Token();
error NoTransferToNullAddress();
error NativeAssetTransferFailed();
error InvalidBridgeConfigLength();
error InvalidAmount();
error InvalidContract();
error InvalidConfig();
error UnsupportedChainId(uint256 chainId);
error InvalidReceiver();
error InvalidDestinationChain();
error InvalidSendingToken();
error InvalidCaller();
error AlreadyInitialized();
error NotInitialized();
error OnlyContractOwner();
error CannotAuthoriseSelf();
error RecoveryAddressCannotBeZero();
error CannotDepositNativeToken();
error InvalidCallData();
error NativeAssetNotSupported();
error UnAuthorized();
error NoSwapFromZeroBalance();
error InvalidFallbackAddress();
error CumulativeSlippageTooHigh(uint256 minAmount, uint256 receivedAmount);
error InsufficientBalance(uint256 required, uint256 balance);
error ZeroAmount();
error InvalidFee();
error InformationMismatch();
error NotAContract();
error NotEnoughBalance(uint256 requested, uint256 available);
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
interface IDiamondCut {
    enum FacetCutAction {
        Add,
        Replace,
        Remove
    }
    // Add=0, Replace=1, Remove=2
    struct FacetCut {
        address facetAddress;
        FacetCutAction action;
        bytes4[] functionSelectors;
    }
    /// @notice Add/replace/remove any number of functions and optionally execute
    ///         a function with delegatecall
    /// @param _diamondCut Contains the facet addresses and function selectors
    /// @param _init The address of the contract or facet to execute _calldata
    /// @param _calldata A function call, including function selector and arguments
    ///                  _calldata is executed with delegatecall on _init
    function diamondCut(
        FacetCut[] calldata _diamondCut,
        address _init,
        bytes calldata _calldata
    ) external;
    event DiamondCut(FacetCut[] _diamondCut, address _init, bytes _calldata);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import { LibDiamond } from "./Libraries/LibDiamond.sol";
import { IDiamondCut } from "./Interfaces/IDiamondCut.sol";
import { LibUtil } from "./Libraries/LibUtil.sol";
contract LiFiDiamond {
    constructor(address _contractOwner, address _diamondCutFacet) payable {
        LibDiamond.setContractOwner(_contractOwner);
        // Add the diamondCut external function from the diamondCutFacet
        IDiamondCut.FacetCut[] memory cut = new IDiamondCut.FacetCut[](1);
        bytes4[] memory functionSelectors = new bytes4[](1);
        functionSelectors[0] = IDiamondCut.diamondCut.selector;
        cut[0] = IDiamondCut.FacetCut({
            facetAddress: _diamondCutFacet,
            action: IDiamondCut.FacetCutAction.Add,
            functionSelectors: functionSelectors
        });
        LibDiamond.diamondCut(cut, address(0), "");
    }
    // Find facet for function that is called and execute the
    // function if a facet is found and return any value.
    // solhint-disable-next-line no-complex-fallback
    fallback() external payable {
        LibDiamond.DiamondStorage storage ds;
        bytes32 position = LibDiamond.DIAMOND_STORAGE_POSITION;
        // get diamond storage
        // solhint-disable-next-line no-inline-assembly
        assembly {
            ds.slot := position
        }
        // get facet from function selector
        address facet = ds.selectorToFacetAndPosition[msg.sig].facetAddress;
        if (facet == address(0)) {
            revert LibDiamond.FunctionDoesNotExist();
        }
        // Execute external function from facet using delegatecall and return any value.
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // copy function selector and any arguments
            calldatacopy(0, 0, calldatasize())
            // execute function call using the facet
            let result := delegatecall(gas(), facet, 0, calldatasize(), 0, 0)
            // get any return value
            returndatacopy(0, 0, returndatasize())
            // return any return value or error back to the caller
            switch result
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }
    // Able to receive ether
    // solhint-disable-next-line no-empty-blocks
    receive() external payable {}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
library LibBytes {
    // solhint-disable no-inline-assembly
    // LibBytes specific errors
    error SliceOverflow();
    error SliceOutOfBounds();
    error AddressOutOfBounds();
    error UintOutOfBounds();
    // -------------------------
    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 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) {
        if (_length + 31 < _length) revert SliceOverflow();
        if (_bytes.length < _start + _length) revert SliceOutOfBounds();
        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) {
        if (_bytes.length < _start + 20) {
            revert AddressOutOfBounds();
        }
        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) {
        if (_bytes.length < _start + 1) {
            revert UintOutOfBounds();
        }
        uint8 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0x1), _start))
        }
        return tempUint;
    }
    function toUint16(bytes memory _bytes, uint256 _start) internal pure returns (uint16) {
        if (_bytes.length < _start + 2) {
            revert UintOutOfBounds();
        }
        uint16 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0x2), _start))
        }
        return tempUint;
    }
    function toUint32(bytes memory _bytes, uint256 _start) internal pure returns (uint32) {
        if (_bytes.length < _start + 4) {
            revert UintOutOfBounds();
        }
        uint32 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0x4), _start))
        }
        return tempUint;
    }
    function toUint64(bytes memory _bytes, uint256 _start) internal pure returns (uint64) {
        if (_bytes.length < _start + 8) {
            revert UintOutOfBounds();
        }
        uint64 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0x8), _start))
        }
        return tempUint;
    }
    function toUint96(bytes memory _bytes, uint256 _start) internal pure returns (uint96) {
        if (_bytes.length < _start + 12) {
            revert UintOutOfBounds();
        }
        uint96 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0xc), _start))
        }
        return tempUint;
    }
    function toUint128(bytes memory _bytes, uint256 _start) internal pure returns (uint128) {
        if (_bytes.length < _start + 16) {
            revert UintOutOfBounds();
        }
        uint128 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0x10), _start))
        }
        return tempUint;
    }
    function toUint256(bytes memory _bytes, uint256 _start) internal pure returns (uint256) {
        if (_bytes.length < _start + 32) {
            revert UintOutOfBounds();
        }
        uint256 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0x20), _start))
        }
        return tempUint;
    }
    function toBytes32(bytes memory _bytes, uint256 _start) internal pure returns (bytes32) {
        if (_bytes.length < _start + 32) {
            revert UintOutOfBounds();
        }
        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)
                        // solhint-disable-next-line no-empty-blocks
                        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;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import { IDiamondCut } from "../Interfaces/IDiamondCut.sol";
import { LibUtil } from "../Libraries/LibUtil.sol";
import { OnlyContractOwner } from "../Errors/GenericErrors.sol";
/// Implementation of EIP-2535 Diamond Standard
/// https://eips.ethereum.org/EIPS/eip-2535
library LibDiamond {
    bytes32 internal constant DIAMOND_STORAGE_POSITION = keccak256("diamond.standard.diamond.storage");
    // Diamond specific errors
    error IncorrectFacetCutAction();
    error NoSelectorsInFace();
    error FunctionAlreadyExists();
    error FacetAddressIsZero();
    error FacetAddressIsNotZero();
    error FacetContainsNoCode();
    error FunctionDoesNotExist();
    error FunctionIsImmutable();
    error InitZeroButCalldataNotEmpty();
    error CalldataEmptyButInitNotZero();
    error InitReverted();
    // ----------------
    struct FacetAddressAndPosition {
        address facetAddress;
        uint96 functionSelectorPosition; // position in facetFunctionSelectors.functionSelectors array
    }
    struct FacetFunctionSelectors {
        bytes4[] functionSelectors;
        uint256 facetAddressPosition; // position of facetAddress in facetAddresses array
    }
    struct DiamondStorage {
        // maps function selector to the facet address and
        // the position of the selector in the facetFunctionSelectors.selectors array
        mapping(bytes4 => FacetAddressAndPosition) selectorToFacetAndPosition;
        // maps facet addresses to function selectors
        mapping(address => FacetFunctionSelectors) facetFunctionSelectors;
        // facet addresses
        address[] facetAddresses;
        // Used to query if a contract implements an interface.
        // Used to implement ERC-165.
        mapping(bytes4 => bool) supportedInterfaces;
        // owner of the contract
        address contractOwner;
    }
    function diamondStorage() internal pure returns (DiamondStorage storage ds) {
        bytes32 position = DIAMOND_STORAGE_POSITION;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            ds.slot := position
        }
    }
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    function setContractOwner(address _newOwner) internal {
        DiamondStorage storage ds = diamondStorage();
        address previousOwner = ds.contractOwner;
        ds.contractOwner = _newOwner;
        emit OwnershipTransferred(previousOwner, _newOwner);
    }
    function contractOwner() internal view returns (address contractOwner_) {
        contractOwner_ = diamondStorage().contractOwner;
    }
    function enforceIsContractOwner() internal view {
        if (msg.sender != diamondStorage().contractOwner) revert OnlyContractOwner();
    }
    event DiamondCut(IDiamondCut.FacetCut[] _diamondCut, address _init, bytes _calldata);
    // Internal function version of diamondCut
    function diamondCut(
        IDiamondCut.FacetCut[] memory _diamondCut,
        address _init,
        bytes memory _calldata
    ) internal {
        for (uint256 facetIndex; facetIndex < _diamondCut.length; ) {
            IDiamondCut.FacetCutAction action = _diamondCut[facetIndex].action;
            if (action == IDiamondCut.FacetCutAction.Add) {
                addFunctions(_diamondCut[facetIndex].facetAddress, _diamondCut[facetIndex].functionSelectors);
            } else if (action == IDiamondCut.FacetCutAction.Replace) {
                replaceFunctions(_diamondCut[facetIndex].facetAddress, _diamondCut[facetIndex].functionSelectors);
            } else if (action == IDiamondCut.FacetCutAction.Remove) {
                removeFunctions(_diamondCut[facetIndex].facetAddress, _diamondCut[facetIndex].functionSelectors);
            } else {
                revert IncorrectFacetCutAction();
            }
            unchecked {
                ++facetIndex;
            }
        }
        emit DiamondCut(_diamondCut, _init, _calldata);
        initializeDiamondCut(_init, _calldata);
    }
    function addFunctions(address _facetAddress, bytes4[] memory _functionSelectors) internal {
        if (_functionSelectors.length == 0) {
            revert NoSelectorsInFace();
        }
        DiamondStorage storage ds = diamondStorage();
        if (LibUtil.isZeroAddress(_facetAddress)) {
            revert FacetAddressIsZero();
        }
        uint96 selectorPosition = uint96(ds.facetFunctionSelectors[_facetAddress].functionSelectors.length);
        // add new facet address if it does not exist
        if (selectorPosition == 0) {
            addFacet(ds, _facetAddress);
        }
        for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; ) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldFacetAddress = ds.selectorToFacetAndPosition[selector].facetAddress;
            if (!LibUtil.isZeroAddress(oldFacetAddress)) {
                revert FunctionAlreadyExists();
            }
            addFunction(ds, selector, selectorPosition, _facetAddress);
            unchecked {
                ++selectorPosition;
                ++selectorIndex;
            }
        }
    }
    function replaceFunctions(address _facetAddress, bytes4[] memory _functionSelectors) internal {
        if (_functionSelectors.length == 0) {
            revert NoSelectorsInFace();
        }
        DiamondStorage storage ds = diamondStorage();
        if (LibUtil.isZeroAddress(_facetAddress)) {
            revert FacetAddressIsZero();
        }
        uint96 selectorPosition = uint96(ds.facetFunctionSelectors[_facetAddress].functionSelectors.length);
        // add new facet address if it does not exist
        if (selectorPosition == 0) {
            addFacet(ds, _facetAddress);
        }
        for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; ) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldFacetAddress = ds.selectorToFacetAndPosition[selector].facetAddress;
            if (oldFacetAddress == _facetAddress) {
                revert FunctionAlreadyExists();
            }
            removeFunction(ds, oldFacetAddress, selector);
            addFunction(ds, selector, selectorPosition, _facetAddress);
            unchecked {
                ++selectorPosition;
                ++selectorIndex;
            }
        }
    }
    function removeFunctions(address _facetAddress, bytes4[] memory _functionSelectors) internal {
        if (_functionSelectors.length == 0) {
            revert NoSelectorsInFace();
        }
        DiamondStorage storage ds = diamondStorage();
        // if function does not exist then do nothing and return
        if (!LibUtil.isZeroAddress(_facetAddress)) {
            revert FacetAddressIsNotZero();
        }
        for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; ) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldFacetAddress = ds.selectorToFacetAndPosition[selector].facetAddress;
            removeFunction(ds, oldFacetAddress, selector);
            unchecked {
                ++selectorIndex;
            }
        }
    }
    function addFacet(DiamondStorage storage ds, address _facetAddress) internal {
        enforceHasContractCode(_facetAddress);
        ds.facetFunctionSelectors[_facetAddress].facetAddressPosition = ds.facetAddresses.length;
        ds.facetAddresses.push(_facetAddress);
    }
    function addFunction(
        DiamondStorage storage ds,
        bytes4 _selector,
        uint96 _selectorPosition,
        address _facetAddress
    ) internal {
        ds.selectorToFacetAndPosition[_selector].functionSelectorPosition = _selectorPosition;
        ds.facetFunctionSelectors[_facetAddress].functionSelectors.push(_selector);
        ds.selectorToFacetAndPosition[_selector].facetAddress = _facetAddress;
    }
    function removeFunction(
        DiamondStorage storage ds,
        address _facetAddress,
        bytes4 _selector
    ) internal {
        if (LibUtil.isZeroAddress(_facetAddress)) {
            revert FunctionDoesNotExist();
        }
        // an immutable function is a function defined directly in a diamond
        if (_facetAddress == address(this)) {
            revert FunctionIsImmutable();
        }
        // replace selector with last selector, then delete last selector
        uint256 selectorPosition = ds.selectorToFacetAndPosition[_selector].functionSelectorPosition;
        uint256 lastSelectorPosition = ds.facetFunctionSelectors[_facetAddress].functionSelectors.length - 1;
        // if not the same then replace _selector with lastSelector
        if (selectorPosition != lastSelectorPosition) {
            bytes4 lastSelector = ds.facetFunctionSelectors[_facetAddress].functionSelectors[lastSelectorPosition];
            ds.facetFunctionSelectors[_facetAddress].functionSelectors[selectorPosition] = lastSelector;
            ds.selectorToFacetAndPosition[lastSelector].functionSelectorPosition = uint96(selectorPosition);
        }
        // delete the last selector
        ds.facetFunctionSelectors[_facetAddress].functionSelectors.pop();
        delete ds.selectorToFacetAndPosition[_selector];
        // if no more selectors for facet address then delete the facet address
        if (lastSelectorPosition == 0) {
            // replace facet address with last facet address and delete last facet address
            uint256 lastFacetAddressPosition = ds.facetAddresses.length - 1;
            uint256 facetAddressPosition = ds.facetFunctionSelectors[_facetAddress].facetAddressPosition;
            if (facetAddressPosition != lastFacetAddressPosition) {
                address lastFacetAddress = ds.facetAddresses[lastFacetAddressPosition];
                ds.facetAddresses[facetAddressPosition] = lastFacetAddress;
                ds.facetFunctionSelectors[lastFacetAddress].facetAddressPosition = facetAddressPosition;
            }
            ds.facetAddresses.pop();
            delete ds.facetFunctionSelectors[_facetAddress].facetAddressPosition;
        }
    }
    function initializeDiamondCut(address _init, bytes memory _calldata) internal {
        if (LibUtil.isZeroAddress(_init)) {
            if (_calldata.length != 0) {
                revert InitZeroButCalldataNotEmpty();
            }
        } else {
            if (_calldata.length == 0) {
                revert CalldataEmptyButInitNotZero();
            }
            if (_init != address(this)) {
                enforceHasContractCode(_init);
            }
            // solhint-disable-next-line avoid-low-level-calls
            (bool success, bytes memory error) = _init.delegatecall(_calldata);
            if (!success) {
                if (error.length > 0) {
                    // bubble up the error
                    revert(string(error));
                } else {
                    revert InitReverted();
                }
            }
        }
    }
    function enforceHasContractCode(address _contract) internal view {
        uint256 contractSize;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            contractSize := extcodesize(_contract)
        }
        if (contractSize == 0) {
            revert FacetContainsNoCode();
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import "./LibBytes.sol";
library LibUtil {
    using LibBytes for bytes;
    function getRevertMsg(bytes memory _res) internal pure returns (string memory) {
        // If the _res length is less than 68, then the transaction failed silently (without a revert message)
        if (_res.length < 68) return "Transaction reverted silently";
        bytes memory revertData = _res.slice(4, _res.length - 4); // Remove the selector which is the first 4 bytes
        return abi.decode(revertData, (string)); // All that remains is the revert string
    }
    /// @notice Determines whether the given address is the zero address
    /// @param addr The address to verify
    /// @return Boolean indicating if the address is the zero address
    function isZeroAddress(address addr) internal pure returns (bool) {
        return addr == address(0);
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.17;
import {OFT} from "layer0/token/oft/OFT.sol";
import {LostToken} from "../LostToken.sol";
/**
 * @author @theo6890
 * @notice Layer ZEro bridged SFUND
 */
contract SFUND_OFTv1 is OFT, LostToken {
    constructor(
        string memory _name,
        string memory _symbol,
        address _layerZero
    ) OFT(_name, _symbol, _layerZero) {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import "./IOFT.sol";
import "./OFTCore.sol";
// override decimal() function is needed
contract OFT is OFTCore, ERC20, IOFT {
    constructor(string memory _name, string memory _symbol, address _lzEndpoint) ERC20(_name, _symbol) OFTCore(_lzEndpoint) {}
    function supportsInterface(bytes4 interfaceId) public view virtual override(OFTCore, IERC165) returns (bool) {
        return interfaceId == type(IOFT).interfaceId || interfaceId == type(IERC20).interfaceId || super.supportsInterface(interfaceId);
    }
    function token() public view virtual override returns (address) {
        return address(this);
    }
    function circulatingSupply() public view virtual override returns (uint) {
        return totalSupply();
    }
    function _debitFrom(address _from, uint16, bytes memory, uint _amount) internal virtual override returns(uint) {
        address spender = _msgSender();
        if (_from != spender) _spendAllowance(_from, spender, _amount);
        _burn(_from, _amount);
        return _amount;
    }
    function _creditTo(uint16, address _toAddress, uint _amount) internal virtual override returns(uint) {
        _mint(_toAddress, _amount);
        return _amount;
    }
}
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.17;
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
contract LostToken is Ownable {
    function transferLostToken(address token, address to) external onlyOwner {
        uint256 balance = IERC20(token).balanceOf(address(this));
        IERC20(token).transfer(to, balance);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)
pragma solidity ^0.8.0;
import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.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.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead 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, IERC20Metadata {
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    uint256 private _totalSupply;
    string private _name;
    string private _symbol;
    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }
    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }
    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override 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 default value returned by this function, unless
     * it's overridden.
     *
     * 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 override returns (uint8) {
        return 18;
    }
    /**
     * @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:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, 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}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        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) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + 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) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }
        return true;
    }
    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This 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:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        _beforeTokenTransfer(from, to, amount);
        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }
        emit Transfer(from, to, amount);
        _afterTokenTransfer(from, to, 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:
     *
     * - `account` 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 += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);
        _afterTokenTransfer(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);
        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }
        emit Transfer(account, address(0), amount);
        _afterTokenTransfer(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 Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }
    /**
     * @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 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 {}
    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}
// 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
pragma solidity >=0.5.0;
import "./IOFTCore.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
/**
 * @dev Interface of the OFT standard
 */
interface IOFT is IOFTCore, IERC20 {
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../../lzApp/NonblockingLzApp.sol";
import "./IOFTCore.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";
abstract contract OFTCore is NonblockingLzApp, ERC165, IOFTCore {
    using BytesLib for bytes;
    uint public constant NO_EXTRA_GAS = 0;
    // packet type
    uint16 public constant PT_SEND = 0;
    bool public useCustomAdapterParams;
    constructor(address _lzEndpoint) NonblockingLzApp(_lzEndpoint) {}
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return interfaceId == type(IOFTCore).interfaceId || super.supportsInterface(interfaceId);
    }
    function estimateSendFee(uint16 _dstChainId, bytes calldata _toAddress, uint _amount, bool _useZro, bytes calldata _adapterParams) public view virtual override returns (uint nativeFee, uint zroFee) {
        // mock the payload for sendFrom()
        bytes memory payload = abi.encode(PT_SEND, _toAddress, _amount);
        return lzEndpoint.estimateFees(_dstChainId, address(this), payload, _useZro, _adapterParams);
    }
    function sendFrom(address _from, uint16 _dstChainId, bytes calldata _toAddress, uint _amount, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) public payable virtual override {
        _send(_from, _dstChainId, _toAddress, _amount, _refundAddress, _zroPaymentAddress, _adapterParams);
    }
    function setUseCustomAdapterParams(bool _useCustomAdapterParams) public virtual onlyOwner {
        useCustomAdapterParams = _useCustomAdapterParams;
        emit SetUseCustomAdapterParams(_useCustomAdapterParams);
    }
    function _nonblockingLzReceive(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload) internal virtual override {
        uint16 packetType;
        assembly {
            packetType := mload(add(_payload, 32))
        }
        if (packetType == PT_SEND) {
            _sendAck(_srcChainId, _srcAddress, _nonce, _payload);
        } else {
            revert("OFTCore: unknown packet type");
        }
    }
    function _send(address _from, uint16 _dstChainId, bytes memory _toAddress, uint _amount, address payable _refundAddress, address _zroPaymentAddress, bytes memory _adapterParams) internal virtual {
        _checkAdapterParams(_dstChainId, PT_SEND, _adapterParams, NO_EXTRA_GAS);
        uint amount = _debitFrom(_from, _dstChainId, _toAddress, _amount);
        bytes memory lzPayload = abi.encode(PT_SEND, _toAddress, amount);
        _lzSend(_dstChainId, lzPayload, _refundAddress, _zroPaymentAddress, _adapterParams, msg.value);
        emit SendToChain(_dstChainId, _from, _toAddress, amount);
    }
    function _sendAck(uint16 _srcChainId, bytes memory, uint64, bytes memory _payload) internal virtual {
        (, bytes memory toAddressBytes, uint amount) = abi.decode(_payload, (uint16, bytes, uint));
        address to = toAddressBytes.toAddress(0);
        amount = _creditTo(_srcChainId, to, amount);
        emit ReceiveFromChain(_srcChainId, to, amount);
    }
    function _checkAdapterParams(uint16 _dstChainId, uint16 _pkType, bytes memory _adapterParams, uint _extraGas) internal virtual {
        if (useCustomAdapterParams) {
            _checkGasLimit(_dstChainId, _pkType, _adapterParams, _extraGas);
        } else {
            require(_adapterParams.length == 0, "OFTCore: _adapterParams must be empty.");
        }
    }
    function _debitFrom(address _from, uint16 _dstChainId, bytes memory _toAddress, uint _amount) internal virtual returns(uint);
    function _creditTo(uint16 _srcChainId, address _toAddress, uint _amount) internal virtual returns(uint);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);
    /**
     * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}
// 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 v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);
    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);
    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}
// 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
pragma solidity >=0.5.0;
import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
/**
 * @dev Interface of the IOFT core standard
 */
interface IOFTCore is IERC165 {
    /**
     * @dev estimate send token `_tokenId` to (`_dstChainId`, `_toAddress`)
     * _dstChainId - L0 defined chain id to send tokens too
     * _toAddress - dynamic bytes array which contains the address to whom you are sending tokens to on the dstChain
     * _amount - amount of the tokens to transfer
     * _useZro - indicates to use zro to pay L0 fees
     * _adapterParam - flexible bytes array to indicate messaging adapter services in L0
     */
    function estimateSendFee(uint16 _dstChainId, bytes calldata _toAddress, uint _amount, bool _useZro, bytes calldata _adapterParams) external view returns (uint nativeFee, uint zroFee);
    /**
     * @dev send `_amount` amount of token to (`_dstChainId`, `_toAddress`) from `_from`
     * `_from` the owner of token
     * `_dstChainId` the destination chain identifier
     * `_toAddress` can be any size depending on the `dstChainId`.
     * `_amount` the quantity of tokens in wei
     * `_refundAddress` the address LayerZero refunds if too much message fee is sent
     * `_zroPaymentAddress` set to address(0x0) if not paying in ZRO (LayerZero Token)
     * `_adapterParams` is a flexible bytes array to indicate messaging adapter services
     */
    function sendFrom(address _from, uint16 _dstChainId, bytes calldata _toAddress, uint _amount, address payable _refundAddress, address _zroPaymentAddress, bytes calldata _adapterParams) external payable;
    /**
     * @dev returns the circulating amount of tokens on current chain
     */
    function circulatingSupply() external view returns (uint);
    /**
     * @dev returns the address of the ERC20 token
     */
    function token() external view returns (address);
    /**
     * @dev Emitted when `_amount` tokens are moved from the `_sender` to (`_dstChainId`, `_toAddress`)
     * `_nonce` is the outbound nonce
     */
    event SendToChain(uint16 indexed _dstChainId, address indexed _from, bytes _toAddress, uint _amount);
    /**
     * @dev Emitted when `_amount` tokens are received from `_srcChainId` into the `_toAddress` on the local chain.
     * `_nonce` is the inbound nonce.
     */
    event ReceiveFromChain(uint16 indexed _srcChainId, address indexed _to, uint _amount);
    event SetUseCustomAdapterParams(bool _useCustomAdapterParams);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./LzApp.sol";
import "../util/ExcessivelySafeCall.sol";
/*
 * the default LayerZero messaging behaviour is blocking, i.e. any failed message will block the channel
 * this abstract class try-catch all fail messages and store locally for future retry. hence, non-blocking
 * NOTE: if the srcAddress is not configured properly, it will still block the message pathway from (srcChainId, srcAddress)
 */
abstract contract NonblockingLzApp is LzApp {
    using ExcessivelySafeCall for address;
    constructor(address _endpoint) LzApp(_endpoint) {}
    mapping(uint16 => mapping(bytes => mapping(uint64 => bytes32))) public failedMessages;
    event MessageFailed(uint16 _srcChainId, bytes _srcAddress, uint64 _nonce, bytes _payload, bytes _reason);
    event RetryMessageSuccess(uint16 _srcChainId, bytes _srcAddress, uint64 _nonce, bytes32 _payloadHash);
    // overriding the virtual function in LzReceiver
    function _blockingLzReceive(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload) internal virtual override {
        (bool success, bytes memory reason) = address(this).excessivelySafeCall(gasleft(), 150, abi.encodeWithSelector(this.nonblockingLzReceive.selector, _srcChainId, _srcAddress, _nonce, _payload));
        // try-catch all errors/exceptions
        if (!success) {
            _storeFailedMessage(_srcChainId, _srcAddress, _nonce, _payload, reason);
        }
    }
    function _storeFailedMessage(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload, bytes memory _reason) internal virtual {
        failedMessages[_srcChainId][_srcAddress][_nonce] = keccak256(_payload);
        emit MessageFailed(_srcChainId, _srcAddress, _nonce, _payload, _reason);
    }
    function nonblockingLzReceive(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) public virtual {
        // only internal transaction
        require(_msgSender() == address(this), "NonblockingLzApp: caller must be LzApp");
        _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);
    }
    //@notice override this function
    function _nonblockingLzReceive(uint16 _srcChainId, bytes memory _srcAddress, uint64 _nonce, bytes memory _payload) internal virtual;
    function retryMessage(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes calldata _payload) public payable virtual {
        // assert there is message to retry
        bytes32 payloadHash = failedMessages[_srcChainId][_srcAddress][_nonce];
        require(payloadHash != bytes32(0), "NonblockingLzApp: no stored message");
        require(keccak256(_payload) == payloadHash, "NonblockingLzApp: invalid payload");
        // clear the stored message
        failedMessages[_srcChainId][_srcAddress][_nonce] = bytes32(0);
        // execute the message. revert if it fails again
        _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);
        emit RetryMessageSuccess(_srcChainId, _srcAddress, _nonce, payloadHash);
    }
}
// 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
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/access/Ownable.sol";
import "../interfaces/ILayerZeroReceiver.sol";
import "../interfaces/ILayerZeroUserApplicationConfig.sol";
import "../interfaces/ILayerZeroEndpoint.sol";
import "../util/BytesLib.sol";
/*
 * a generic LzReceiver implementation
 */
abstract contract LzApp is Ownable, ILayerZeroReceiver, ILayerZeroUserApplicationConfig {
    using BytesLib for bytes;
    // ua can not send payload larger than this by default, but it can be changed by the ua owner
    uint constant public DEFAULT_PAYLOAD_SIZE_LIMIT = 10000;
    ILayerZeroEndpoint public immutable lzEndpoint;
    mapping(uint16 => bytes) public trustedRemoteLookup;
    mapping(uint16 => mapping(uint16 => uint)) public minDstGasLookup;
    mapping(uint16 => uint) public payloadSizeLimitLookup;
    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");
        _checkPayloadSize(_dstChainId, _payload.length);
        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))
        }
    }
    function _checkPayloadSize(uint16 _dstChainId, uint _payloadSize) internal view virtual {
        uint payloadSizeLimit = payloadSizeLimitLookup[_dstChainId];
        if (payloadSizeLimit == 0) { // use default if not set
            payloadSizeLimit = DEFAULT_PAYLOAD_SIZE_LIMIT;
        }
        require(_payloadSize <= payloadSizeLimit, "LzApp: payload size is too large");
    }
    //---------------------------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 _remoteChainId, bytes calldata _path) external onlyOwner {
        trustedRemoteLookup[_remoteChainId] = _path;
        emit SetTrustedRemote(_remoteChainId, _path);
    }
    function setTrustedRemoteAddress(uint16 _remoteChainId, bytes calldata _remoteAddress) external onlyOwner {
        trustedRemoteLookup[_remoteChainId] = abi.encodePacked(_remoteAddress, address(this));
        emit SetTrustedRemoteAddress(_remoteChainId, _remoteAddress);
    }
    function getTrustedRemoteAddress(uint16 _remoteChainId) external view returns (bytes memory) {
        bytes memory path = trustedRemoteLookup[_remoteChainId];
        require(path.length != 0, "LzApp: no trusted path record");
        return path.slice(0, path.length - 20); // the last 20 bytes should be address(this)
    }
    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);
    }
    // if the size is 0, it means default size limit
    function setPayloadSizeLimit(uint16 _dstChainId, uint _size) external onlyOwner {
        payloadSizeLimitLookup[_dstChainId] = _size;
    }
    //--------------------------- 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 OR Apache-2.0
pragma solidity >=0.7.6;
library ExcessivelySafeCall {
    uint256 constant LOW_28_MASK =
    0x00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff;
    /// @notice Use when you _really_ really _really_ don't trust the called
    /// contract. This prevents the called contract from causing reversion of
    /// the caller in as many ways as we can.
    /// @dev The main difference between this and a solidity low-level call is
    /// that we limit the number of bytes that the callee can cause to be
    /// copied to caller memory. This prevents stupid things like malicious
    /// contracts returning 10,000,000 bytes causing a local OOG when copying
    /// to memory.
    /// @param _target The address to call
    /// @param _gas The amount of gas to forward to the remote contract
    /// @param _maxCopy The maximum number of bytes of returndata to copy
    /// to memory.
    /// @param _calldata The data to send to the remote contract
    /// @return success and returndata, as `.call()`. Returndata is capped to
    /// `_maxCopy` bytes.
    function excessivelySafeCall(
        address _target,
        uint256 _gas,
        uint16 _maxCopy,
        bytes memory _calldata
    ) internal returns (bool, bytes memory) {
        // set up for assembly call
        uint256 _toCopy;
        bool _success;
        bytes memory _returnData = new bytes(_maxCopy);
        // dispatch message to recipient
        // by assembly calling "handle" function
        // we call via assembly to avoid memcopying a very large returndata
        // returned by a malicious contract
        assembly {
            _success := call(
            _gas, // gas
            _target, // recipient
            0, // ether value
            add(_calldata, 0x20), // inloc
            mload(_calldata), // inlen
            0, // outloc
            0 // outlen
            )
        // limit our copy to 256 bytes
            _toCopy := returndatasize()
            if gt(_toCopy, _maxCopy) {
                _toCopy := _maxCopy
            }
        // Store the length of the copied bytes
            mstore(_returnData, _toCopy)
        // copy the bytes from returndata[0:_toCopy]
            returndatacopy(add(_returnData, 0x20), 0, _toCopy)
        }
        return (_success, _returnData);
    }
    /// @notice Use when you _really_ really _really_ don't trust the called
    /// contract. This prevents the called contract from causing reversion of
    /// the caller in as many ways as we can.
    /// @dev The main difference between this and a solidity low-level call is
    /// that we limit the number of bytes that the callee can cause to be
    /// copied to caller memory. This prevents stupid things like malicious
    /// contracts returning 10,000,000 bytes causing a local OOG when copying
    /// to memory.
    /// @param _target The address to call
    /// @param _gas The amount of gas to forward to the remote contract
    /// @param _maxCopy The maximum number of bytes of returndata to copy
    /// to memory.
    /// @param _calldata The data to send to the remote contract
    /// @return success and returndata, as `.call()`. Returndata is capped to
    /// `_maxCopy` bytes.
    function excessivelySafeStaticCall(
        address _target,
        uint256 _gas,
        uint16 _maxCopy,
        bytes memory _calldata
    ) internal view returns (bool, bytes memory) {
        // set up for assembly call
        uint256 _toCopy;
        bool _success;
        bytes memory _returnData = new bytes(_maxCopy);
        // dispatch message to recipient
        // by assembly calling "handle" function
        // we call via assembly to avoid memcopying a very large returndata
        // returned by a malicious contract
        assembly {
            _success := staticcall(
            _gas, // gas
            _target, // recipient
            add(_calldata, 0x20), // inloc
            mload(_calldata), // inlen
            0, // outloc
            0 // outlen
            )
        // limit our copy to 256 bytes
            _toCopy := returndatasize()
            if gt(_toCopy, _maxCopy) {
                _toCopy := _maxCopy
            }
        // Store the length of the copied bytes
            mstore(_returnData, _toCopy)
        // copy the bytes from returndata[0:_toCopy]
            returndatacopy(add(_returnData, 0x20), 0, _toCopy)
        }
        return (_success, _returnData);
    }
    /**
     * @notice Swaps function selectors in encoded contract calls
     * @dev Allows reuse of encoded calldata for functions with identical
     * argument types but different names. It simply swaps out the first 4 bytes
     * for the new selector. This function modifies memory in place, and should
     * only be used with caution.
     * @param _newSelector The new 4-byte selector
     * @param _buf The encoded contract args
     */
    function swapSelector(bytes4 _newSelector, bytes memory _buf)
    internal
    pure
    {
        require(_buf.length >= 4);
        uint256 _mask = LOW_28_MASK;
        assembly {
        // load the first word of
            let _word := mload(add(_buf, 0x20))
        // mask out the top 4 bytes
        // /x
            _word := and(_word, _mask)
            _word := or(_newSelector, _word)
            mstore(add(_buf, 0x20), _word)
        }
    }
}
// SPDX-License-Identifier: MIT
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: MIT
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 >=0.5.0;
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 lzApp 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: 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;
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.13;
import { LibAsset } from "../Libraries/LibAsset.sol";
/// @title Fee Collector
/// @author LI.FI (https://li.fi)
/// @notice Provides functionality for collecting integrator fees
contract FeeCollector {
    /// State ///
    // Integrator -> TokenAddress -> Balance
    mapping(address => mapping(address => uint256)) private _balances;
    // TokenAddress -> Balance
    mapping(address => uint256) private _lifiBalances;
    address public owner;
    address public pendingOwner;
    /// Errors ///
    error Unauthorized(address);
    error NoNullOwner();
    error NewOwnerMustNotBeSelf();
    error NoPendingOwnershipTransfer();
    error NotPendingOwner();
    error TransferFailure();
    /// Events ///
    event FeesCollected(address indexed _token, address indexed _integrator, uint256 _integratorFee, uint256 _lifiFee);
    event FeesWithdrawn(address indexed _token, address indexed _to, uint256 _amount);
    event LiFiFeesWithdrawn(address indexed _token, address indexed _to, uint256 _amount);
    event OwnershipTransferRequested(address indexed _from, address indexed _to);
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /// Constructor ///
    constructor(address _owner) {
        owner = _owner;
    }
    /// External Methods ///
    /// @notice Collects fees for the integrator
    /// @param tokenAddress address of the token to collect fees for
    /// @param integratorFee amount of fees to collect going to the integrator
    /// @param lifiFee amount of fees to collect going to lifi
    /// @param integratorAddress address of the integrator
    function collectTokenFees(
        address tokenAddress,
        uint256 integratorFee,
        uint256 lifiFee,
        address integratorAddress
    ) external {
        LibAsset.depositAsset(tokenAddress, integratorFee + lifiFee);
        _balances[integratorAddress][tokenAddress] += integratorFee;
        _lifiBalances[tokenAddress] += lifiFee;
        emit FeesCollected(tokenAddress, integratorAddress, integratorFee, lifiFee);
    }
    /// @notice Collects fees for the integrator in native token
    /// @param integratorFee amount of fees to collect going to the integrator
    /// @param lifiFee amount of fees to collect going to lifi
    /// @param integratorAddress address of the integrator
    function collectNativeFees(
        uint256 integratorFee,
        uint256 lifiFee,
        address integratorAddress
    ) external payable {
        _balances[integratorAddress][LibAsset.NULL_ADDRESS] += integratorFee;
        _lifiBalances[LibAsset.NULL_ADDRESS] += lifiFee;
        uint256 remaining = msg.value - (integratorFee + lifiFee);
        // Prevent extra native token from being locked in the contract
        if (remaining > 0) {
            (bool success, ) = msg.sender.call{ value: remaining }("");
            if (!success) {
                revert TransferFailure();
            }
        }
        emit FeesCollected(LibAsset.NULL_ADDRESS, integratorAddress, integratorFee, lifiFee);
    }
    /// @notice Withdraw fees and sends to the integrator
    /// @param tokenAddress address of the token to withdraw fees for
    function withdrawIntegratorFees(address tokenAddress) external {
        uint256 balance = _balances[msg.sender][tokenAddress];
        if (balance == 0) {
            return;
        }
        _balances[msg.sender][tokenAddress] = 0;
        LibAsset.transferAsset(tokenAddress, payable(msg.sender), balance);
        emit FeesWithdrawn(tokenAddress, msg.sender, balance);
    }
    /// @notice Batch withdraw fees and sends to the integrator
    /// @param tokenAddresses addresses of the tokens to withdraw fees for
    function batchWithdrawIntegratorFees(address[] memory tokenAddresses) external {
        uint256 length = tokenAddresses.length;
        uint256 balance;
        for (uint256 i = 0; i < length; i++) {
            balance = _balances[msg.sender][tokenAddresses[i]];
            if (balance == 0) {
                continue;
            }
            _balances[msg.sender][tokenAddresses[i]] = 0;
            LibAsset.transferAsset(tokenAddresses[i], payable(msg.sender), balance);
            emit FeesWithdrawn(tokenAddresses[i], msg.sender, balance);
        }
    }
    /// @notice Withdraws fees and sends to lifi
    /// @param tokenAddress address of the token to withdraw fees for
    function withdrawLifiFees(address tokenAddress) external {
        _enforceIsContractOwner();
        uint256 balance = _lifiBalances[tokenAddress];
        if (balance == 0) {
            return;
        }
        _lifiBalances[tokenAddress] = 0;
        LibAsset.transferAsset(tokenAddress, payable(owner), balance);
        emit LiFiFeesWithdrawn(tokenAddress, msg.sender, balance);
    }
    /// @notice Batch withdraws fees and sends to lifi
    /// @param tokenAddresses addresses of the tokens to withdraw fees for
    function batchWithdrawLifiFees(address[] memory tokenAddresses) external {
        _enforceIsContractOwner();
        uint256 length = tokenAddresses.length;
        uint256 balance;
        for (uint256 i = 0; i < length; i++) {
            balance = _lifiBalances[tokenAddresses[i]];
            if (balance == 0) {
                continue;
            }
            _lifiBalances[tokenAddresses[i]] = 0;
            LibAsset.transferAsset(tokenAddresses[i], payable(owner), balance);
            emit LiFiFeesWithdrawn(tokenAddresses[i], msg.sender, balance);
        }
    }
    /// @notice Returns the balance of the integrator
    /// @param integratorAddress address of the integrator
    /// @param tokenAddress address of the token to get the balance of
    function getTokenBalance(address integratorAddress, address tokenAddress) external view returns (uint256) {
        return _balances[integratorAddress][tokenAddress];
    }
    /// @notice Returns the balance of lifi
    /// @param tokenAddress address of the token to get the balance of
    function getLifiTokenBalance(address tokenAddress) external view returns (uint256) {
        return _lifiBalances[tokenAddress];
    }
    /// @notice Intitiates transfer of ownership to a new address
    /// @param _newOwner the address to transfer ownership to
    function transferOwnership(address _newOwner) external {
        _enforceIsContractOwner();
        if (_newOwner == LibAsset.NULL_ADDRESS) revert NoNullOwner();
        if (_newOwner == owner) revert NewOwnerMustNotBeSelf();
        pendingOwner = _newOwner;
        emit OwnershipTransferRequested(msg.sender, pendingOwner);
    }
    /// @notice Cancel transfer of ownership
    function cancelOnwershipTransfer() external {
        _enforceIsContractOwner();
        if (pendingOwner == LibAsset.NULL_ADDRESS) revert NoPendingOwnershipTransfer();
        pendingOwner = LibAsset.NULL_ADDRESS;
    }
    /// @notice Confirms transfer of ownership to the calling address (msg.sender)
    function confirmOwnershipTransfer() external {
        if (msg.sender != pendingOwner) revert NotPendingOwner();
        owner = pendingOwner;
        pendingOwner = LibAsset.NULL_ADDRESS;
        emit OwnershipTransferred(owner, pendingOwner);
    }
    /// Private Methods ///
    /// @notice Ensures that the calling address is the owner of the contract
    function _enforceIsContractOwner() private view {
        if (msg.sender != owner) {
            revert Unauthorized(msg.sender);
        }
    }
}
// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.13;
import { NullAddrIsNotAnERC20Token, NullAddrIsNotAValidSpender, NoTransferToNullAddress, InvalidAmount, NativeValueWithERC, NativeAssetTransferFailed } from "../Errors/GenericErrors.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
/// @title LibAsset
/// @author Connext <[email protected]>
/// @notice This library contains helpers for dealing with onchain transfers
///         of assets, including accounting for the native asset `assetId`
///         conventions and any noncompliant ERC20 transfers
library LibAsset {
    uint256 private constant MAX_INT = type(uint256).max;
    address internal constant NULL_ADDRESS = 0x0000000000000000000000000000000000000000; //address(0)
    /// @dev All native assets use the empty address for their asset id
    ///      by convention
    address internal constant NATIVE_ASSETID = NULL_ADDRESS; //address(0)
    /// @notice Gets the balance of the inheriting contract for the given asset
    /// @param assetId The asset identifier to get the balance of
    /// @return Balance held by contracts using this library
    function getOwnBalance(address assetId) internal view returns (uint256) {
        return assetId == NATIVE_ASSETID ? address(this).balance : IERC20(assetId).balanceOf(address(this));
    }
    /// @notice Transfers ether from the inheriting contract to a given
    ///         recipient
    /// @param recipient Address to send ether to
    /// @param amount Amount to send to given recipient
    function transferNativeAsset(address payable recipient, uint256 amount) private {
        if (recipient == NULL_ADDRESS) revert NoTransferToNullAddress();
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, ) = recipient.call{ value: amount }("");
        if (!success) revert NativeAssetTransferFailed();
    }
    /// @notice Gives MAX approval for another address to spend tokens
    /// @param assetId Token address to transfer
    /// @param spender Address to give spend approval to
    /// @param amount Amount to approve for spending
    function maxApproveERC20(
        IERC20 assetId,
        address spender,
        uint256 amount
    ) internal {
        if (address(assetId) == NATIVE_ASSETID) return;
        if (spender == NULL_ADDRESS) revert NullAddrIsNotAValidSpender();
        uint256 allowance = assetId.allowance(address(this), spender);
        if (allowance < amount) SafeERC20.safeApprove(IERC20(assetId), spender, MAX_INT);
    }
    /// @notice Transfers tokens from the inheriting contract to a given
    ///         recipient
    /// @param assetId Token address to transfer
    /// @param recipient Address to send token to
    /// @param amount Amount to send to given recipient
    function transferERC20(
        address assetId,
        address recipient,
        uint256 amount
    ) private {
        if (isNativeAsset(assetId)) revert NullAddrIsNotAnERC20Token();
        SafeERC20.safeTransfer(IERC20(assetId), recipient, amount);
    }
    /// @notice Transfers tokens from a sender to a given recipient
    /// @param assetId Token address to transfer
    /// @param from Address of sender/owner
    /// @param to Address of recipient/spender
    /// @param amount Amount to transfer from owner to spender
    function transferFromERC20(
        address assetId,
        address from,
        address to,
        uint256 amount
    ) internal {
        if (assetId == NATIVE_ASSETID) revert NullAddrIsNotAnERC20Token();
        if (to == NULL_ADDRESS) revert NoTransferToNullAddress();
        SafeERC20.safeTransferFrom(IERC20(assetId), from, to, amount);
    }
    /// @notice Deposits an asset into the contract and performs checks to avoid NativeValueWithERC
    /// @param tokenId Token to deposit
    /// @param amount Amount to deposit
    /// @param isNative Wether the token is native or ERC20
    function depositAsset(
        address tokenId,
        uint256 amount,
        bool isNative
    ) internal {
        if (amount == 0) revert InvalidAmount();
        if (isNative) {
            if (msg.value != amount) revert InvalidAmount();
        } else {
            if (msg.value != 0) revert NativeValueWithERC();
            uint256 _fromTokenBalance = LibAsset.getOwnBalance(tokenId);
            LibAsset.transferFromERC20(tokenId, msg.sender, address(this), amount);
            if (LibAsset.getOwnBalance(tokenId) - _fromTokenBalance != amount) revert InvalidAmount();
        }
    }
    /// @notice Overload for depositAsset(address tokenId, uint256 amount, bool isNative)
    /// @param tokenId Token to deposit
    /// @param amount Amount to deposit
    function depositAsset(address tokenId, uint256 amount) internal {
        return depositAsset(tokenId, amount, tokenId == NATIVE_ASSETID);
    }
    /// @notice Determines whether the given assetId is the native asset
    /// @param assetId The asset identifier to evaluate
    /// @return Boolean indicating if the asset is the native asset
    function isNativeAsset(address assetId) internal pure returns (bool) {
        return assetId == NATIVE_ASSETID;
    }
    /// @notice Wrapper function to transfer a given asset (native or erc20) to
    ///         some recipient. Should handle all non-compliant return value
    ///         tokens as well by using the SafeERC20 contract by open zeppelin.
    /// @param assetId Asset id for transfer (address(0) for native asset,
    ///                token address for erc20s)
    /// @param recipient Address to send asset to
    /// @param amount Amount to send to given recipient
    function transferAsset(
        address assetId,
        address payable recipient,
        uint256 amount
    ) internal {
        (assetId == NATIVE_ASSETID)
            ? transferNativeAsset(recipient, amount)
            : transferERC20(assetId, recipient, amount);
    }
    /// @dev Checks whether the given address is a contract and contains code
    function isContract(address _contractAddr) internal view returns (bool) {
        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            size := extcodesize(_contractAddr)
        }
        return size > 0;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;
error InvalidAmount();
error TokenAddressIsZero();
error CannotBridgeToSameNetwork();
error ZeroPostSwapBalance();
error InvalidBridgeConfigLength();
error NoSwapDataProvided();
error NativeValueWithERC();
error ContractCallNotAllowed();
error NullAddrIsNotAValidSpender();
error NullAddrIsNotAnERC20Token();
error NoTransferToNullAddress();
error NativeAssetTransferFailed();
error InvalidContract();
error InvalidConfig();
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../IERC20.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 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'
        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) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _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
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
 * @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 ^0.8.0;
/**
 * @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;
        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");
        (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");
        (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");
        (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");
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal 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
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: contracts/interfaces/IUniswapV2Pair.sol

pragma solidity >=0.5.0;

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}

// File: contracts/interfaces/IUniswapV2ERC20.sol

pragma solidity >=0.5.0;

interface IUniswapV2ERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
}

// File: contracts/libraries/SafeMath.sol

pragma solidity =0.5.16;

// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

library SafeMath {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x, 'ds-math-add-overflow');
    }

    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x, 'ds-math-sub-underflow');
    }

    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
    }
}

// File: contracts/UniswapV2ERC20.sol

pragma solidity =0.5.16;



contract UniswapV2ERC20 is IUniswapV2ERC20 {
    using SafeMath for uint;

    string public constant name = 'Uniswap V2';
    string public constant symbol = 'UNI-V2';
    uint8 public constant decimals = 18;
    uint  public totalSupply;
    mapping(address => uint) public balanceOf;
    mapping(address => mapping(address => uint)) public allowance;

    bytes32 public DOMAIN_SEPARATOR;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    mapping(address => uint) public nonces;

    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    constructor() public {
        uint 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, uint value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }

    function _approve(address owner, address spender, uint value) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function _transfer(address from, address to, uint value) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

    function approve(address spender, uint value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(address from, address to, uint value) external returns (bool) {
        if (allowance[from][msg.sender] != uint(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
        require(deadline >= block.timestamp, 'UniswapV2: 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, 'UniswapV2: INVALID_SIGNATURE');
        _approve(owner, spender, value);
    }
}

// File: contracts/libraries/Math.sol

pragma solidity =0.5.16;

// a library for performing various math operations

library Math {
    function min(uint x, uint y) internal pure returns (uint z) {
        z = x < y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint y) internal pure returns (uint z) {
        if (y > 3) {
            z = y;
            uint x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}

// File: contracts/libraries/UQ112x112.sol

pragma solidity =0.5.16;

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))

// range: [0, 2**112 - 1]
// resolution: 1 / 2**112

library UQ112x112 {
    uint224 constant Q112 = 2**112;

    // encode a uint112 as a UQ112x112
    function encode(uint112 y) internal pure returns (uint224 z) {
        z = uint224(y) * Q112; // never overflows
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
        z = x / uint224(y);
    }
}

// File: contracts/interfaces/IERC20.sol

pragma solidity >=0.5.0;

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
}

// File: contracts/interfaces/IUniswapV2Factory.sol

pragma solidity >=0.5.0;

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

// File: contracts/interfaces/IUniswapV2Callee.sol

pragma solidity >=0.5.0;

interface IUniswapV2Callee {
    function uniswapV2Call(address sender, uint amount0, uint amount1, bytes calldata data) external;
}

// File: contracts/UniswapV2Pair.sol

pragma solidity =0.5.16;








contract UniswapV2Pair is IUniswapV2Pair, UniswapV2ERC20 {
    using SafeMath  for uint;
    using UQ112x112 for uint224;

    uint public constant MINIMUM_LIQUIDITY = 10**3;
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)')));

    address public factory;
    address public token0;
    address public token1;

    uint112 private reserve0;           // uses single storage slot, accessible via getReserves
    uint112 private reserve1;           // uses single storage slot, accessible via getReserves
    uint32  private blockTimestampLast; // uses single storage slot, accessible via getReserves

    uint public price0CumulativeLast;
    uint public price1CumulativeLast;
    uint public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event

    uint private unlocked = 1;
    modifier lock() {
        require(unlocked == 1, 'UniswapV2: LOCKED');
        unlocked = 0;
        _;
        unlocked = 1;
    }

    function getReserves() public view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast) {
        _reserve0 = reserve0;
        _reserve1 = reserve1;
        _blockTimestampLast = blockTimestampLast;
    }

    function _safeTransfer(address token, address to, uint value) private {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'UniswapV2: TRANSFER_FAILED');
    }

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    constructor() public {
        factory = msg.sender;
    }

    // called once by the factory at time of deployment
    function initialize(address _token0, address _token1) external {
        require(msg.sender == factory, 'UniswapV2: FORBIDDEN'); // sufficient check
        token0 = _token0;
        token1 = _token1;
    }

    // update reserves and, on the first call per block, price accumulators
    function _update(uint balance0, uint balance1, uint112 _reserve0, uint112 _reserve1) private {
        require(balance0 <= uint112(-1) && balance1 <= uint112(-1), 'UniswapV2: OVERFLOW');
        uint32 blockTimestamp = uint32(block.timestamp % 2**32);
        uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
        if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
            // * never overflows, and + overflow is desired
            price0CumulativeLast += uint(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
            price1CumulativeLast += uint(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
        }
        reserve0 = uint112(balance0);
        reserve1 = uint112(balance1);
        blockTimestampLast = blockTimestamp;
        emit Sync(reserve0, reserve1);
    }

    // if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k)
    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        address feeTo = IUniswapV2Factory(factory).feeTo();
        feeOn = feeTo != address(0);
        uint _kLast = kLast; // gas savings
        if (feeOn) {
            if (_kLast != 0) {
                uint rootK = Math.sqrt(uint(_reserve0).mul(_reserve1));
                uint rootKLast = Math.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint numerator = totalSupply.mul(rootK.sub(rootKLast));
                    uint denominator = rootK.mul(5).add(rootKLast);
                    uint liquidity = numerator / denominator;
                    if (liquidity > 0) _mint(feeTo, liquidity);
                }
            }
        } else if (_kLast != 0) {
            kLast = 0;
        }
    }

    // this low-level function should be called from a contract which performs important safety checks
    function mint(address to) external lock returns (uint liquidity) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        uint balance0 = IERC20(token0).balanceOf(address(this));
        uint balance1 = IERC20(token1).balanceOf(address(this));
        uint amount0 = balance0.sub(_reserve0);
        uint amount1 = balance1.sub(_reserve1);

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        if (_totalSupply == 0) {
            liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
           _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
        } else {
            liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
        }
        require(liquidity > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_MINTED');
        _mint(to, liquidity);

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Mint(msg.sender, amount0, amount1);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function burn(address to) external lock returns (uint amount0, uint amount1) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        address _token0 = token0;                                // gas savings
        address _token1 = token1;                                // gas savings
        uint balance0 = IERC20(_token0).balanceOf(address(this));
        uint balance1 = IERC20(_token1).balanceOf(address(this));
        uint liquidity = balanceOf[address(this)];

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution
        amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution
        require(amount0 > 0 && amount1 > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_BURNED');
        _burn(address(this), liquidity);
        _safeTransfer(_token0, to, amount0);
        _safeTransfer(_token1, to, amount1);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Burn(msg.sender, amount0, amount1, to);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock {
        require(amount0Out > 0 || amount1Out > 0, 'UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT');
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'UniswapV2: INSUFFICIENT_LIQUIDITY');

        uint balance0;
        uint balance1;
        { // scope for _token{0,1}, avoids stack too deep errors
        address _token0 = token0;
        address _token1 = token1;
        require(to != _token0 && to != _token1, 'UniswapV2: INVALID_TO');
        if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
        if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
        if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));
        }
        uint amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
        uint amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, 'UniswapV2: INSUFFICIENT_INPUT_AMOUNT');
        { // scope for reserve{0,1}Adjusted, avoids stack too deep errors
        uint balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3));
        uint balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3));
        require(balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(1000**2), 'UniswapV2: K');
        }

        _update(balance0, balance1, _reserve0, _reserve1);
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
    }

    // force balances to match reserves
    function skim(address to) external lock {
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        _safeTransfer(_token0, to, IERC20(_token0).balanceOf(address(this)).sub(reserve0));
        _safeTransfer(_token1, to, IERC20(_token1).balanceOf(address(this)).sub(reserve1));
    }

    // force reserves to match balances
    function sync() external lock {
        _update(IERC20(token0).balanceOf(address(this)), IERC20(token1).balanceOf(address(this)), reserve0, reserve1);
    }
}

// File: contracts/uniswapv2/interfaces/IUniswapV2Factory.sol

pragma solidity >=0.5.0;

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function migrator() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
    function setMigrator(address) external;
}

// File: contracts/uniswapv2/libraries/SafeMath.sol

pragma solidity =0.6.12;

// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

library SafeMathUniswap {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x, 'ds-math-add-overflow');
    }

    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x, 'ds-math-sub-underflow');
    }

    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
    }
}

// File: contracts/uniswapv2/UniswapV2ERC20.sol

pragma solidity =0.6.12;


contract UniswapV2ERC20 {
    using SafeMathUniswap for uint;

    string public constant name = 'SushiSwap LP Token';
    string public constant symbol = 'SLP';
    uint8 public constant decimals = 18;
    uint  public totalSupply;
    mapping(address => uint) public balanceOf;
    mapping(address => mapping(address => uint)) public allowance;

    bytes32 public DOMAIN_SEPARATOR;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    mapping(address => uint) public nonces;

    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    constructor() public {
        uint 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, uint value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }

    function _approve(address owner, address spender, uint value) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function _transfer(address from, address to, uint value) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

    function approve(address spender, uint value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(address from, address to, uint value) external returns (bool) {
        if (allowance[from][msg.sender] != uint(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
        require(deadline >= block.timestamp, 'UniswapV2: 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, 'UniswapV2: INVALID_SIGNATURE');
        _approve(owner, spender, value);
    }
}

// File: contracts/uniswapv2/libraries/Math.sol

pragma solidity =0.6.12;

// a library for performing various math operations

library Math {
    function min(uint x, uint y) internal pure returns (uint z) {
        z = x < y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint y) internal pure returns (uint z) {
        if (y > 3) {
            z = y;
            uint x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}

// File: contracts/uniswapv2/libraries/UQ112x112.sol

pragma solidity =0.6.12;

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))

// range: [0, 2**112 - 1]
// resolution: 1 / 2**112

library UQ112x112 {
    uint224 constant Q112 = 2**112;

    // encode a uint112 as a UQ112x112
    function encode(uint112 y) internal pure returns (uint224 z) {
        z = uint224(y) * Q112; // never overflows
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
        z = x / uint224(y);
    }
}

// File: contracts/uniswapv2/interfaces/IERC20.sol

pragma solidity >=0.5.0;

interface IERC20Uniswap {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
}

// File: contracts/uniswapv2/interfaces/IUniswapV2Callee.sol

pragma solidity >=0.5.0;

interface IUniswapV2Callee {
    function uniswapV2Call(address sender, uint amount0, uint amount1, bytes calldata data) external;
}

// File: contracts/uniswapv2/UniswapV2Pair.sol

pragma solidity =0.6.12;








interface IMigrator {
    // Return the desired amount of liquidity token that the migrator wants.
    function desiredLiquidity() external view returns (uint256);
}

contract UniswapV2Pair is UniswapV2ERC20 {
    using SafeMathUniswap  for uint;
    using UQ112x112 for uint224;

    uint public constant MINIMUM_LIQUIDITY = 10**3;
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)')));

    address public factory;
    address public token0;
    address public token1;

    uint112 private reserve0;           // uses single storage slot, accessible via getReserves
    uint112 private reserve1;           // uses single storage slot, accessible via getReserves
    uint32  private blockTimestampLast; // uses single storage slot, accessible via getReserves

    uint public price0CumulativeLast;
    uint public price1CumulativeLast;
    uint public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event

    uint private unlocked = 1;
    modifier lock() {
        require(unlocked == 1, 'UniswapV2: LOCKED');
        unlocked = 0;
        _;
        unlocked = 1;
    }

    function getReserves() public view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast) {
        _reserve0 = reserve0;
        _reserve1 = reserve1;
        _blockTimestampLast = blockTimestampLast;
    }

    function _safeTransfer(address token, address to, uint value) private {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'UniswapV2: TRANSFER_FAILED');
    }

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    constructor() public {
        factory = msg.sender;
    }

    // called once by the factory at time of deployment
    function initialize(address _token0, address _token1) external {
        require(msg.sender == factory, 'UniswapV2: FORBIDDEN'); // sufficient check
        token0 = _token0;
        token1 = _token1;
    }

    // update reserves and, on the first call per block, price accumulators
    function _update(uint balance0, uint balance1, uint112 _reserve0, uint112 _reserve1) private {
        require(balance0 <= uint112(-1) && balance1 <= uint112(-1), 'UniswapV2: OVERFLOW');
        uint32 blockTimestamp = uint32(block.timestamp % 2**32);
        uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
        if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
            // * never overflows, and + overflow is desired
            price0CumulativeLast += uint(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
            price1CumulativeLast += uint(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
        }
        reserve0 = uint112(balance0);
        reserve1 = uint112(balance1);
        blockTimestampLast = blockTimestamp;
        emit Sync(reserve0, reserve1);
    }

    // if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k)
    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        address feeTo = IUniswapV2Factory(factory).feeTo();
        feeOn = feeTo != address(0);
        uint _kLast = kLast; // gas savings
        if (feeOn) {
            if (_kLast != 0) {
                uint rootK = Math.sqrt(uint(_reserve0).mul(_reserve1));
                uint rootKLast = Math.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint numerator = totalSupply.mul(rootK.sub(rootKLast));
                    uint denominator = rootK.mul(5).add(rootKLast);
                    uint liquidity = numerator / denominator;
                    if (liquidity > 0) _mint(feeTo, liquidity);
                }
            }
        } else if (_kLast != 0) {
            kLast = 0;
        }
    }

    // this low-level function should be called from a contract which performs important safety checks
    function mint(address to) external lock returns (uint liquidity) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        uint balance0 = IERC20Uniswap(token0).balanceOf(address(this));
        uint balance1 = IERC20Uniswap(token1).balanceOf(address(this));
        uint amount0 = balance0.sub(_reserve0);
        uint amount1 = balance1.sub(_reserve1);

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        if (_totalSupply == 0) {
            address migrator = IUniswapV2Factory(factory).migrator();
            if (msg.sender == migrator) {
                liquidity = IMigrator(migrator).desiredLiquidity();
                require(liquidity > 0 && liquidity != uint256(-1), "Bad desired liquidity");
            } else {
                require(migrator == address(0), "Must not have migrator");
                liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
                _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
            }
        } else {
            liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
        }
        require(liquidity > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_MINTED');
        _mint(to, liquidity);

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Mint(msg.sender, amount0, amount1);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function burn(address to) external lock returns (uint amount0, uint amount1) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        address _token0 = token0;                                // gas savings
        address _token1 = token1;                                // gas savings
        uint balance0 = IERC20Uniswap(_token0).balanceOf(address(this));
        uint balance1 = IERC20Uniswap(_token1).balanceOf(address(this));
        uint liquidity = balanceOf[address(this)];

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution
        amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution
        require(amount0 > 0 && amount1 > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_BURNED');
        _burn(address(this), liquidity);
        _safeTransfer(_token0, to, amount0);
        _safeTransfer(_token1, to, amount1);
        balance0 = IERC20Uniswap(_token0).balanceOf(address(this));
        balance1 = IERC20Uniswap(_token1).balanceOf(address(this));

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Burn(msg.sender, amount0, amount1, to);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock {
        require(amount0Out > 0 || amount1Out > 0, 'UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT');
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'UniswapV2: INSUFFICIENT_LIQUIDITY');

        uint balance0;
        uint balance1;
        { // scope for _token{0,1}, avoids stack too deep errors
        address _token0 = token0;
        address _token1 = token1;
        require(to != _token0 && to != _token1, 'UniswapV2: INVALID_TO');
        if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
        if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
        if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);
        balance0 = IERC20Uniswap(_token0).balanceOf(address(this));
        balance1 = IERC20Uniswap(_token1).balanceOf(address(this));
        }
        uint amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
        uint amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, 'UniswapV2: INSUFFICIENT_INPUT_AMOUNT');
        { // scope for reserve{0,1}Adjusted, avoids stack too deep errors
        uint balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3));
        uint balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3));
        require(balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(1000**2), 'UniswapV2: K');
        }

        _update(balance0, balance1, _reserve0, _reserve1);
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
    }

    // force balances to match reserves
    function skim(address to) external lock {
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        _safeTransfer(_token0, to, IERC20Uniswap(_token0).balanceOf(address(this)).sub(reserve0));
        _safeTransfer(_token1, to, IERC20Uniswap(_token1).balanceOf(address(this)).sub(reserve1));
    }

    // force reserves to match balances
    function sync() external lock {
        _update(IERC20Uniswap(token0).balanceOf(address(this)), IERC20Uniswap(token1).balanceOf(address(this)), reserve0, reserve1);
    }
}

// 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 ^0.4.18;

contract WETH9 {
    string public name     = "Wrapped Ether";
    string public symbol   = "WETH";
    uint8  public decimals = 18;

    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);

    mapping (address => uint)                       public  balanceOf;
    mapping (address => mapping (address => uint))  public  allowance;

    function() public payable {
        deposit();
    }
    function deposit() public payable {
        balanceOf[msg.sender] += msg.value;
        Deposit(msg.sender, msg.value);
    }
    function withdraw(uint wad) public {
        require(balanceOf[msg.sender] >= wad);
        balanceOf[msg.sender] -= wad;
        msg.sender.transfer(wad);
        Withdrawal(msg.sender, wad);
    }

    function totalSupply() public view returns (uint) {
        return this.balance;
    }

    function approve(address guy, uint wad) public returns (bool) {
        allowance[msg.sender][guy] = wad;
        Approval(msg.sender, guy, wad);
        return true;
    }

    function transfer(address dst, uint wad) public returns (bool) {
        return transferFrom(msg.sender, dst, wad);
    }

    function transferFrom(address src, address dst, uint wad)
        public
        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;
        }

        balanceOf[src] -= wad;
        balanceOf[dst] += wad;

        Transfer(src, dst, wad);

        return true;
    }
}


/*
                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

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                     END OF TERMS AND CONDITIONS

            How to Apply These Terms to Your New Programs

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  To do so, attach the following notices to the program.  It is safest
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Also add information on how to contact you by electronic and paper mail.

  If the program does terminal interaction, make it output a short
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    <program>  Copyright (C) <year>  <name of author>
    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
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*/

// SPDX-License-Identifier: MIT
pragma solidity 0.8.1;
/**
 * @title ERC20 token receiver interface
 *
 * @dev Interface for any contract that wants to support safe transfers
 *      from ERC20 token smart contracts.
 * @dev Inspired by ERC721 and ERC223 token standards
 *
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 * @dev See https://github.com/ethereum/EIPs/issues/223
 *
 * @author Basil Gorin
 */
interface ERC20Receiver {
  /**
   * @notice Handle the receipt of a ERC20 token(s)
   * @dev The ERC20 smart contract calls this function on the recipient
   *      after a successful transfer (`safeTransferFrom`).
   *      This function MAY throw to revert and reject the transfer.
   *      Return of other than the magic value MUST result in the transaction being reverted.
   * @notice The contract address is always the message sender.
   *      A wallet/broker/auction application MUST implement the wallet interface
   *      if it will accept safe transfers.
   * @param _operator The address which called `safeTransferFrom` function
   * @param _from The address which previously owned the token
   * @param _value amount of tokens which is being transferred
   * @param _data additional data with no specified format
   * @return `bytes4(keccak256("onERC20Received(address,address,uint256,bytes)"))` unless throwing
   */
  function onERC20Received(address _operator, address _from, uint256 _value, bytes calldata _data) external returns(bytes4);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.1;
import "../utils/AddressUtils.sol";
import "../utils/AccessControl.sol";
import "./ERC20Receiver.sol";
/**
 * @title Illuvium (ILV) ERC20 token
 *
 * @notice Illuvium is a core ERC20 token powering the game.
 *      It serves as an in-game currency, is tradable on exchanges,
 *      it powers up the governance protocol (Illuvium DAO) and participates in Yield Farming.
 *
 * @dev Token Summary:
 *      - Symbol: ILV
 *      - Name: Illuvium
 *      - Decimals: 18
 *      - Initial token supply: 7,000,000 ILV
 *      - Maximum final token supply: 10,000,000 ILV
 *          - Up to 3,000,000 ILV may get minted in 3 years period via yield farming
 *      - Mintable: total supply may increase
 *      - Burnable: total supply may decrease
 *
 * @dev Token balances and total supply are effectively 192 bits long, meaning that maximum
 *      possible total supply smart contract is able to track is 2^192 (close to 10^40 tokens)
 *
 * @dev Smart contract doesn't use safe math. All arithmetic operations are overflow/underflow safe.
 *      Additionally, Solidity 0.8.1 enforces overflow/underflow safety.
 *
 * @dev ERC20: reviewed according to https://eips.ethereum.org/EIPS/eip-20
 *
 * @dev ERC20: contract has passed OpenZeppelin ERC20 tests,
 *      see https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/test/token/ERC20/ERC20.behavior.js
 *      see https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/test/token/ERC20/ERC20.test.js
 *      see adopted copies of these tests in the `test` folder
 *
 * @dev ERC223/ERC777: not supported;
 *      send tokens via `safeTransferFrom` and implement `ERC20Receiver.onERC20Received` on the receiver instead
 *
 * @dev Multiple Withdrawal Attack on ERC20 Tokens (ISBN:978-1-7281-3027-9) - resolved
 *      Related events and functions are marked with "ISBN:978-1-7281-3027-9" tag:
 *        - event Transferred(address indexed _by, address indexed _from, address indexed _to, uint256 _value)
 *        - event Approved(address indexed _owner, address indexed _spender, uint256 _oldValue, uint256 _value)
 *        - function increaseAllowance(address _spender, uint256 _value) public returns (bool)
 *        - function decreaseAllowance(address _spender, uint256 _value) public returns (bool)
 *      See: https://ieeexplore.ieee.org/document/8802438
 *      See: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
 *
 * @author Basil Gorin
 */
contract IlluviumERC20 is AccessControl {
  /**
   * @dev Smart contract unique identifier, a random number
   * @dev Should be regenerated each time smart contact source code is changed
   *      and changes smart contract itself is to be redeployed
   * @dev Generated using https://www.random.org/bytes/
   */
  uint256 public constant TOKEN_UID = 0x83ecb176af7c4f35a45ff0018282e3a05a1018065da866182df12285866f5a2c;
  /**
   * @notice Name of the token: Illuvium
   *
   * @notice ERC20 name of the token (long name)
   *
   * @dev ERC20 `function name() public view returns (string)`
   *
   * @dev Field is declared public: getter name() is created when compiled,
   *      it returns the name of the token.
   */
  string public constant name = "Illuvium";
  /**
   * @notice Symbol of the token: ILV
   *
   * @notice ERC20 symbol of that token (short name)
   *
   * @dev ERC20 `function symbol() public view returns (string)`
   *
   * @dev Field is declared public: getter symbol() is created when compiled,
   *      it returns the symbol of the token
   */
  string public constant symbol = "ILV";
  /**
   * @notice Decimals of the token: 18
   *
   * @dev ERC20 `function decimals() public view returns (uint8)`
   *
   * @dev Field is declared public: getter decimals() is created when compiled,
   *      it returns the number of decimals used to get its user representation.
   *      For example, if `decimals` equals `6`, a balance of `1,500,000` tokens should
   *      be displayed to a user as `1,5` (`1,500,000 / 10 ** 6`).
   *
   * @dev NOTE: This information is only used for _display_ purposes: it in
   *      no way affects any of the arithmetic of the contract, including balanceOf() and transfer().
   */
  uint8 public constant decimals = 18;
  /**
   * @notice Total supply of the token: initially 7,000,000,
   *      with the potential to grow up to 10,000,000 during yield farming period (3 years)
   *
   * @dev ERC20 `function totalSupply() public view returns (uint256)`
   *
   * @dev Field is declared public: getter totalSupply() is created when compiled,
   *      it returns the amount of tokens in existence.
   */
  uint256 public totalSupply; // is set to 7 million * 10^18 in the constructor
  /**
   * @dev A record of all the token balances
   * @dev This mapping keeps record of all token owners:
   *      owner => balance
   */
  mapping(address => uint256) public tokenBalances;
  /**
   * @notice A record of each account's voting delegate
   *
   * @dev Auxiliary data structure used to sum up an account's voting power
   *
   * @dev This mapping keeps record of all voting power delegations:
   *      voting delegator (token owner) => voting delegate
   */
  mapping(address => address) public votingDelegates;
  /**
   * @notice A voting power record binds voting power of a delegate to a particular
   *      block when the voting power delegation change happened
   */
  struct VotingPowerRecord {
    /*
     * @dev block.number when delegation has changed; starting from
     *      that block voting power value is in effect
     */
    uint64 blockNumber;
    /*
     * @dev cumulative voting power a delegate has obtained starting
     *      from the block stored in blockNumber
     */
    uint192 votingPower;
  }
  /**
   * @notice A record of each account's voting power
   *
   * @dev Primarily data structure to store voting power for each account.
   *      Voting power sums up from the account's token balance and delegated
   *      balances.
   *
   * @dev Stores current value and entire history of its changes.
   *      The changes are stored as an array of checkpoints.
   *      Checkpoint is an auxiliary data structure containing voting
   *      power (number of votes) and block number when the checkpoint is saved
   *
   * @dev Maps voting delegate => voting power record
   */
  mapping(address => VotingPowerRecord[]) public votingPowerHistory;
  /**
   * @dev A record of nonces for signing/validating signatures in `delegateWithSig`
   *      for every delegate, increases after successful validation
   *
   * @dev Maps delegate address => delegate nonce
   */
  mapping(address => uint256) public nonces;
  /**
   * @notice A record of all the allowances to spend tokens on behalf
   * @dev Maps token owner address to an address approved to spend
   *      some tokens on behalf, maps approved address to that amount
   * @dev owner => spender => value
   */
  mapping(address => mapping(address => uint256)) public transferAllowances;
  /**
   * @notice Enables ERC20 transfers of the tokens
   *      (transfer by the token owner himself)
   * @dev Feature FEATURE_TRANSFERS must be enabled in order for
   *      `transfer()` function to succeed
   */
  uint32 public constant FEATURE_TRANSFERS = 0x0000_0001;
  /**
   * @notice Enables ERC20 transfers on behalf
   *      (transfer by someone else on behalf of token owner)
   * @dev Feature FEATURE_TRANSFERS_ON_BEHALF must be enabled in order for
   *      `transferFrom()` function to succeed
   * @dev Token owner must call `approve()` first to authorize
   *      the transfer on behalf
   */
  uint32 public constant FEATURE_TRANSFERS_ON_BEHALF = 0x0000_0002;
  /**
   * @dev Defines if the default behavior of `transfer` and `transferFrom`
   *      checks if the receiver smart contract supports ERC20 tokens
   * @dev When feature FEATURE_UNSAFE_TRANSFERS is enabled the transfers do not
   *      check if the receiver smart contract supports ERC20 tokens,
   *      i.e. `transfer` and `transferFrom` behave like `unsafeTransferFrom`
   * @dev When feature FEATURE_UNSAFE_TRANSFERS is disabled (default) the transfers
   *      check if the receiver smart contract supports ERC20 tokens,
   *      i.e. `transfer` and `transferFrom` behave like `safeTransferFrom`
   */
  uint32 public constant FEATURE_UNSAFE_TRANSFERS = 0x0000_0004;
  /**
   * @notice Enables token owners to burn their own tokens,
   *      including locked tokens which are burnt first
   * @dev Feature FEATURE_OWN_BURNS must be enabled in order for
   *      `burn()` function to succeed when called by token owner
   */
  uint32 public constant FEATURE_OWN_BURNS = 0x0000_0008;
  /**
   * @notice Enables approved operators to burn tokens on behalf of their owners,
   *      including locked tokens which are burnt first
   * @dev Feature FEATURE_OWN_BURNS must be enabled in order for
   *      `burn()` function to succeed when called by approved operator
   */
  uint32 public constant FEATURE_BURNS_ON_BEHALF = 0x0000_0010;
  /**
   * @notice Enables delegators to elect delegates
   * @dev Feature FEATURE_DELEGATIONS must be enabled in order for
   *      `delegate()` function to succeed
   */
  uint32 public constant FEATURE_DELEGATIONS = 0x0000_0020;
  /**
   * @notice Enables delegators to elect delegates on behalf
   *      (via an EIP712 signature)
   * @dev Feature FEATURE_DELEGATIONS must be enabled in order for
   *      `delegateWithSig()` function to succeed
   */
  uint32 public constant FEATURE_DELEGATIONS_ON_BEHALF = 0x0000_0040;
  /**
   * @notice Token creator is responsible for creating (minting)
   *      tokens to an arbitrary address
   * @dev Role ROLE_TOKEN_CREATOR allows minting tokens
   *      (calling `mint` function)
   */
  uint32 public constant ROLE_TOKEN_CREATOR = 0x0001_0000;
  /**
   * @notice Token destroyer is responsible for destroying (burning)
   *      tokens owned by an arbitrary address
   * @dev Role ROLE_TOKEN_DESTROYER allows burning tokens
   *      (calling `burn` function)
   */
  uint32 public constant ROLE_TOKEN_DESTROYER = 0x0002_0000;
  /**
   * @notice ERC20 receivers are allowed to receive tokens without ERC20 safety checks,
   *      which may be useful to simplify tokens transfers into "legacy" smart contracts
   * @dev When `FEATURE_UNSAFE_TRANSFERS` is not enabled addresses having
   *      `ROLE_ERC20_RECEIVER` permission are allowed to receive tokens
   *      via `transfer` and `transferFrom` functions in the same way they
   *      would via `unsafeTransferFrom` function
   * @dev When `FEATURE_UNSAFE_TRANSFERS` is enabled `ROLE_ERC20_RECEIVER` permission
   *      doesn't affect the transfer behaviour since
   *      `transfer` and `transferFrom` behave like `unsafeTransferFrom` for any receiver
   * @dev ROLE_ERC20_RECEIVER is a shortening for ROLE_UNSAFE_ERC20_RECEIVER
   */
  uint32 public constant ROLE_ERC20_RECEIVER = 0x0004_0000;
  /**
   * @notice ERC20 senders are allowed to send tokens without ERC20 safety checks,
   *      which may be useful to simplify tokens transfers into "legacy" smart contracts
   * @dev When `FEATURE_UNSAFE_TRANSFERS` is not enabled senders having
   *      `ROLE_ERC20_SENDER` permission are allowed to send tokens
   *      via `transfer` and `transferFrom` functions in the same way they
   *      would via `unsafeTransferFrom` function
   * @dev When `FEATURE_UNSAFE_TRANSFERS` is enabled `ROLE_ERC20_SENDER` permission
   *      doesn't affect the transfer behaviour since
   *      `transfer` and `transferFrom` behave like `unsafeTransferFrom` for any receiver
   * @dev ROLE_ERC20_SENDER is a shortening for ROLE_UNSAFE_ERC20_SENDER
   */
  uint32 public constant ROLE_ERC20_SENDER = 0x0008_0000;
  /**
   * @dev Magic value to be returned by ERC20Receiver upon successful reception of token(s)
   * @dev Equal to `bytes4(keccak256("onERC20Received(address,address,uint256,bytes)"))`,
   *      which can be also obtained as `ERC20Receiver(address(0)).onERC20Received.selector`
   */
  bytes4 private constant ERC20_RECEIVED = 0x4fc35859;
  /**
   * @notice EIP-712 contract's domain typeHash, see https://eips.ethereum.org/EIPS/eip-712#rationale-for-typehash
   */
  bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");
  /**
   * @notice EIP-712 delegation struct typeHash, see https://eips.ethereum.org/EIPS/eip-712#rationale-for-typehash
   */
  bytes32 public constant DELEGATION_TYPEHASH = keccak256("Delegation(address delegate,uint256 nonce,uint256 expiry)");
  /**
   * @dev Fired in transfer(), transferFrom() and some other (non-ERC20) functions
   *
   * @dev ERC20 `event Transfer(address indexed _from, address indexed _to, uint256 _value)`
   *
   * @param _from an address tokens were consumed from
   * @param _to an address tokens were sent to
   * @param _value number of tokens transferred
   */
  event Transfer(address indexed _from, address indexed _to, uint256 _value);
  /**
   * @dev Fired in approve() and approveAtomic() functions
   *
   * @dev ERC20 `event Approval(address indexed _owner, address indexed _spender, uint256 _value)`
   *
   * @param _owner an address which granted a permission to transfer
   *      tokens on its behalf
   * @param _spender an address which received a permission to transfer
   *      tokens on behalf of the owner `_owner`
   * @param _value amount of tokens granted to transfer on behalf
   */
  event Approval(address indexed _owner, address indexed _spender, uint256 _value);
  /**
   * @dev Fired in mint() function
   *
   * @param _by an address which minted some tokens (transaction sender)
   * @param _to an address the tokens were minted to
   * @param _value an amount of tokens minted
   */
  event Minted(address indexed _by, address indexed _to, uint256 _value);
  /**
   * @dev Fired in burn() function
   *
   * @param _by an address which burned some tokens (transaction sender)
   * @param _from an address the tokens were burnt from
   * @param _value an amount of tokens burnt
   */
  event Burnt(address indexed _by, address indexed _from, uint256 _value);
  /**
   * @dev Resolution for the Multiple Withdrawal Attack on ERC20 Tokens (ISBN:978-1-7281-3027-9)
   *
   * @dev Similar to ERC20 Transfer event, but also logs an address which executed transfer
   *
   * @dev Fired in transfer(), transferFrom() and some other (non-ERC20) functions
   *
   * @param _by an address which performed the transfer
   * @param _from an address tokens were consumed from
   * @param _to an address tokens were sent to
   * @param _value number of tokens transferred
   */
  event Transferred(address indexed _by, address indexed _from, address indexed _to, uint256 _value);
  /**
   * @dev Resolution for the Multiple Withdrawal Attack on ERC20 Tokens (ISBN:978-1-7281-3027-9)
   *
   * @dev Similar to ERC20 Approve event, but also logs old approval value
   *
   * @dev Fired in approve() and approveAtomic() functions
   *
   * @param _owner an address which granted a permission to transfer
   *      tokens on its behalf
   * @param _spender an address which received a permission to transfer
   *      tokens on behalf of the owner `_owner`
   * @param _oldValue previously granted amount of tokens to transfer on behalf
   * @param _value new granted amount of tokens to transfer on behalf
   */
  event Approved(address indexed _owner, address indexed _spender, uint256 _oldValue, uint256 _value);
  /**
   * @dev Notifies that a key-value pair in `votingDelegates` mapping has changed,
   *      i.e. a delegator address has changed its delegate address
   *
   * @param _of delegator address, a token owner
   * @param _from old delegate, an address which delegate right is revoked
   * @param _to new delegate, an address which received the voting power
   */
  event DelegateChanged(address indexed _of, address indexed _from, address indexed _to);
  /**
   * @dev Notifies that a key-value pair in `votingPowerHistory` mapping has changed,
   *      i.e. a delegate's voting power has changed.
   *
   * @param _of delegate whose voting power has changed
   * @param _fromVal previous number of votes delegate had
   * @param _toVal new number of votes delegate has
   */
  event VotingPowerChanged(address indexed _of, uint256 _fromVal, uint256 _toVal);
  /**
   * @dev Deploys the token smart contract,
   *      assigns initial token supply to the address specified
   *
   * @param _initialHolder owner of the initial token supply
   */
  constructor(address _initialHolder) {
    // verify initial holder address non-zero (is set)
    require(_initialHolder != address(0), "_initialHolder not set (zero address)");
    // mint initial supply
    mint(_initialHolder, 7_000_000e18);
  }
  // ===== Start: ERC20/ERC223/ERC777 functions =====
  /**
   * @notice Gets the balance of a particular address
   *
   * @dev ERC20 `function balanceOf(address _owner) public view returns (uint256 balance)`
   *
   * @param _owner the address to query the the balance for
   * @return balance an amount of tokens owned by the address specified
   */
  function balanceOf(address _owner) public view returns (uint256 balance) {
    // read the balance and return
    return tokenBalances[_owner];
  }
  /**
   * @notice Transfers some tokens to an external address or a smart contract
   *
   * @dev ERC20 `function transfer(address _to, uint256 _value) public returns (bool success)`
   *
   * @dev Called by token owner (an address which has a
   *      positive token balance tracked by this smart contract)
   * @dev Throws on any error like
   *      * insufficient token balance or
   *      * incorrect `_to` address:
   *          * zero address or
   *          * self address or
   *          * smart contract which doesn't support ERC20
   *
   * @param _to an address to transfer tokens to,
   *      must be either an external address or a smart contract,
   *      compliant with the ERC20 standard
   * @param _value amount of tokens to be transferred, must
   *      be greater than zero
   * @return success true on success, throws otherwise
   */
  function transfer(address _to, uint256 _value) public returns (bool success) {
    // just delegate call to `transferFrom`,
    // `FEATURE_TRANSFERS` is verified inside it
    return transferFrom(msg.sender, _to, _value);
  }
  /**
   * @notice Transfers some tokens on behalf of address `_from' (token owner)
   *      to some other address `_to`
   *
   * @dev ERC20 `function transferFrom(address _from, address _to, uint256 _value) public returns (bool success)`
   *
   * @dev Called by token owner on his own or approved address,
   *      an address approved earlier by token owner to
   *      transfer some amount of tokens on its behalf
   * @dev Throws on any error like
   *      * insufficient token balance or
   *      * incorrect `_to` address:
   *          * zero address or
   *          * same as `_from` address (self transfer)
   *          * smart contract which doesn't support ERC20
   *
   * @param _from token owner which approved caller (transaction sender)
   *      to transfer `_value` of tokens on its behalf
   * @param _to an address to transfer tokens to,
   *      must be either an external address or a smart contract,
   *      compliant with the ERC20 standard
   * @param _value amount of tokens to be transferred, must
   *      be greater than zero
   * @return success true on success, throws otherwise
   */
  function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
    // depending on `FEATURE_UNSAFE_TRANSFERS` we execute either safe (default)
    // or unsafe transfer
    // if `FEATURE_UNSAFE_TRANSFERS` is enabled
    // or receiver has `ROLE_ERC20_RECEIVER` permission
    // or sender has `ROLE_ERC20_SENDER` permission
    if(isFeatureEnabled(FEATURE_UNSAFE_TRANSFERS)
      || isOperatorInRole(_to, ROLE_ERC20_RECEIVER)
      || isSenderInRole(ROLE_ERC20_SENDER)) {
      // we execute unsafe transfer - delegate call to `unsafeTransferFrom`,
      // `FEATURE_TRANSFERS` is verified inside it
      unsafeTransferFrom(_from, _to, _value);
    }
    // otherwise - if `FEATURE_UNSAFE_TRANSFERS` is disabled
    // and receiver doesn't have `ROLE_ERC20_RECEIVER` permission
    else {
      // we execute safe transfer - delegate call to `safeTransferFrom`, passing empty `_data`,
      // `FEATURE_TRANSFERS` is verified inside it
      safeTransferFrom(_from, _to, _value, "");
    }
    // both `unsafeTransferFrom` and `safeTransferFrom` throw on any error, so
    // if we're here - it means operation successful,
    // just return true
    return true;
  }
  /**
   * @notice Transfers some tokens on behalf of address `_from' (token owner)
   *      to some other address `_to`
   *
   * @dev Inspired by ERC721 safeTransferFrom, this function allows to
   *      send arbitrary data to the receiver on successful token transfer
   * @dev Called by token owner on his own or approved address,
   *      an address approved earlier by token owner to
   *      transfer some amount of tokens on its behalf
   * @dev Throws on any error like
   *      * insufficient token balance or
   *      * incorrect `_to` address:
   *          * zero address or
   *          * same as `_from` address (self transfer)
   *          * smart contract which doesn't support ERC20Receiver interface
   * @dev Returns silently on success, throws otherwise
   *
   * @param _from token owner which approved caller (transaction sender)
   *      to transfer `_value` of tokens on its behalf
   * @param _to an address to transfer tokens to,
   *      must be either an external address or a smart contract,
   *      compliant with the ERC20 standard
   * @param _value amount of tokens to be transferred, must
   *      be greater than zero
   * @param _data [optional] additional data with no specified format,
   *      sent in onERC20Received call to `_to` in case if its a smart contract
   */
  function safeTransferFrom(address _from, address _to, uint256 _value, bytes memory _data) public {
    // first delegate call to `unsafeTransferFrom`
    // to perform the unsafe token(s) transfer
    unsafeTransferFrom(_from, _to, _value);
    // after the successful transfer - check if receiver supports
    // ERC20Receiver and execute a callback handler `onERC20Received`,
    // reverting whole transaction on any error:
    // check if receiver `_to` supports ERC20Receiver interface
    if(AddressUtils.isContract(_to)) {
      // if `_to` is a contract - execute onERC20Received
      bytes4 response = ERC20Receiver(_to).onERC20Received(msg.sender, _from, _value, _data);
      // expected response is ERC20_RECEIVED
      require(response == ERC20_RECEIVED, "invalid onERC20Received response");
    }
  }
  /**
   * @notice Transfers some tokens on behalf of address `_from' (token owner)
   *      to some other address `_to`
   *
   * @dev In contrast to `safeTransferFrom` doesn't check recipient
   *      smart contract to support ERC20 tokens (ERC20Receiver)
   * @dev Designed to be used by developers when the receiver is known
   *      to support ERC20 tokens but doesn't implement ERC20Receiver interface
   * @dev Called by token owner on his own or approved address,
   *      an address approved earlier by token owner to
   *      transfer some amount of tokens on its behalf
   * @dev Throws on any error like
   *      * insufficient token balance or
   *      * incorrect `_to` address:
   *          * zero address or
   *          * same as `_from` address (self transfer)
   * @dev Returns silently on success, throws otherwise
   *
   * @param _from token owner which approved caller (transaction sender)
   *      to transfer `_value` of tokens on its behalf
   * @param _to an address to transfer tokens to,
   *      must be either an external address or a smart contract,
   *      compliant with the ERC20 standard
   * @param _value amount of tokens to be transferred, must
   *      be greater than zero
   */
  function unsafeTransferFrom(address _from, address _to, uint256 _value) public {
    // if `_from` is equal to sender, require transfers feature to be enabled
    // otherwise require transfers on behalf feature to be enabled
    require(_from == msg.sender && isFeatureEnabled(FEATURE_TRANSFERS)
         || _from != msg.sender && isFeatureEnabled(FEATURE_TRANSFERS_ON_BEHALF),
            _from == msg.sender? "transfers are disabled": "transfers on behalf are disabled");
    // non-zero source address check - Zeppelin
    // obviously, zero source address is a client mistake
    // it's not part of ERC20 standard but it's reasonable to fail fast
    // since for zero value transfer transaction succeeds otherwise
    require(_from != address(0), "ERC20: transfer from the zero address"); // Zeppelin msg
    // non-zero recipient address check
    require(_to != address(0), "ERC20: transfer to the zero address"); // Zeppelin msg
    // sender and recipient cannot be the same
    require(_from != _to, "sender and recipient are the same (_from = _to)");
    // sending tokens to the token smart contract itself is a client mistake
    require(_to != address(this), "invalid recipient (transfer to the token smart contract itself)");
    // according to ERC-20 Token Standard, https://eips.ethereum.org/EIPS/eip-20
    // "Transfers of 0 values MUST be treated as normal transfers and fire the Transfer event."
    if(_value == 0) {
      // emit an ERC20 transfer event
      emit Transfer(_from, _to, _value);
      // don't forget to return - we're done
      return;
    }
    // no need to make arithmetic overflow check on the _value - by design of mint()
    // in case of transfer on behalf
    if(_from != msg.sender) {
      // read allowance value - the amount of tokens allowed to transfer - into the stack
      uint256 _allowance = transferAllowances[_from][msg.sender];
      // verify sender has an allowance to transfer amount of tokens requested
      require(_allowance >= _value, "ERC20: transfer amount exceeds allowance"); // Zeppelin msg
      // update allowance value on the stack
      _allowance -= _value;
      // update the allowance value in storage
      transferAllowances[_from][msg.sender] = _allowance;
      // emit an improved atomic approve event
      emit Approved(_from, msg.sender, _allowance + _value, _allowance);
      // emit an ERC20 approval event to reflect the decrease
      emit Approval(_from, msg.sender, _allowance);
    }
    // verify sender has enough tokens to transfer on behalf
    require(tokenBalances[_from] >= _value, "ERC20: transfer amount exceeds balance"); // Zeppelin msg
    // perform the transfer:
    // decrease token owner (sender) balance
    tokenBalances[_from] -= _value;
    // increase `_to` address (receiver) balance
    tokenBalances[_to] += _value;
    // move voting power associated with the tokens transferred
    __moveVotingPower(votingDelegates[_from], votingDelegates[_to], _value);
    // emit an improved transfer event
    emit Transferred(msg.sender, _from, _to, _value);
    // emit an ERC20 transfer event
    emit Transfer(_from, _to, _value);
  }
  /**
   * @notice Approves address called `_spender` to transfer some amount
   *      of tokens on behalf of the owner
   *
   * @dev ERC20 `function approve(address _spender, uint256 _value) public returns (bool success)`
   *
   * @dev Caller must not necessarily own any tokens to grant the permission
   *
   * @param _spender an address approved by the caller (token owner)
   *      to spend some tokens on its behalf
   * @param _value an amount of tokens spender `_spender` is allowed to
   *      transfer on behalf of the token owner
   * @return success true on success, throws otherwise
   */
  function approve(address _spender, uint256 _value) public returns (bool success) {
    // non-zero spender address check - Zeppelin
    // obviously, zero spender address is a client mistake
    // it's not part of ERC20 standard but it's reasonable to fail fast
    require(_spender != address(0), "ERC20: approve to the zero address"); // Zeppelin msg
    // read old approval value to emmit an improved event (ISBN:978-1-7281-3027-9)
    uint256 _oldValue = transferAllowances[msg.sender][_spender];
    // perform an operation: write value requested into the storage
    transferAllowances[msg.sender][_spender] = _value;
    // emit an improved atomic approve event (ISBN:978-1-7281-3027-9)
    emit Approved(msg.sender, _spender, _oldValue, _value);
    // emit an ERC20 approval event
    emit Approval(msg.sender, _spender, _value);
    // operation successful, return true
    return true;
  }
  /**
   * @notice Returns the amount which _spender is still allowed to withdraw from _owner.
   *
   * @dev ERC20 `function allowance(address _owner, address _spender) public view returns (uint256 remaining)`
   *
   * @dev A function to check an amount of tokens owner approved
   *      to transfer on its behalf by some other address called "spender"
   *
   * @param _owner an address which approves transferring some tokens on its behalf
   * @param _spender an address approved to transfer some tokens on behalf
   * @return remaining an amount of tokens approved address `_spender` can transfer on behalf
   *      of token owner `_owner`
   */
  function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
    // read the value from storage and return
    return transferAllowances[_owner][_spender];
  }
  // ===== End: ERC20/ERC223/ERC777 functions =====
  // ===== Start: Resolution for the Multiple Withdrawal Attack on ERC20 Tokens (ISBN:978-1-7281-3027-9) =====
  /**
   * @notice Increases the allowance granted to `spender` by the transaction sender
   *
   * @dev Resolution for the Multiple Withdrawal Attack on ERC20 Tokens (ISBN:978-1-7281-3027-9)
   *
   * @dev Throws if value to increase by is zero or too big and causes arithmetic overflow
   *
   * @param _spender an address approved by the caller (token owner)
   *      to spend some tokens on its behalf
   * @param _value an amount of tokens to increase by
   * @return success true on success, throws otherwise
   */
  function increaseAllowance(address _spender, uint256 _value) public virtual returns (bool) {
    // read current allowance value
    uint256 currentVal = transferAllowances[msg.sender][_spender];
    // non-zero _value and arithmetic overflow check on the allowance
    require(currentVal + _value > currentVal, "zero value approval increase or arithmetic overflow");
    // delegate call to `approve` with the new value
    return approve(_spender, currentVal + _value);
  }
  /**
   * @notice Decreases the allowance granted to `spender` by the caller.
   *
   * @dev Resolution for the Multiple Withdrawal Attack on ERC20 Tokens (ISBN:978-1-7281-3027-9)
   *
   * @dev Throws if value to decrease by is zero or is bigger than currently allowed value
   *
   * @param _spender an address approved by the caller (token owner)
   *      to spend some tokens on its behalf
   * @param _value an amount of tokens to decrease by
   * @return success true on success, throws otherwise
   */
  function decreaseAllowance(address _spender, uint256 _value) public virtual returns (bool) {
    // read current allowance value
    uint256 currentVal = transferAllowances[msg.sender][_spender];
    // non-zero _value check on the allowance
    require(_value > 0, "zero value approval decrease");
    // verify allowance decrease doesn't underflow
    require(currentVal >= _value, "ERC20: decreased allowance below zero");
    // delegate call to `approve` with the new value
    return approve(_spender, currentVal - _value);
  }
  // ===== End: Resolution for the Multiple Withdrawal Attack on ERC20 Tokens (ISBN:978-1-7281-3027-9) =====
  // ===== Start: Minting/burning extension =====
  /**
   * @dev Mints (creates) some tokens to address specified
   * @dev The value specified is treated as is without taking
   *      into account what `decimals` value is
   * @dev Behaves effectively as `mintTo` function, allowing
   *      to specify an address to mint tokens to
   * @dev Requires sender to have `ROLE_TOKEN_CREATOR` permission
   *
   * @dev Throws on overflow, if totalSupply + _value doesn't fit into uint256
   *
   * @param _to an address to mint tokens to
   * @param _value an amount of tokens to mint (create)
   */
  function mint(address _to, uint256 _value) public {
    // check if caller has sufficient permissions to mint tokens
    require(isSenderInRole(ROLE_TOKEN_CREATOR), "insufficient privileges (ROLE_TOKEN_CREATOR required)");
    // non-zero recipient address check
    require(_to != address(0), "ERC20: mint to the zero address"); // Zeppelin msg
    // non-zero _value and arithmetic overflow check on the total supply
    // this check automatically secures arithmetic overflow on the individual balance
    require(totalSupply + _value > totalSupply, "zero value mint or arithmetic overflow");
    // uint192 overflow check (required by voting delegation)
    require(totalSupply + _value <= type(uint192).max, "total supply overflow (uint192)");
    // perform mint:
    // increase total amount of tokens value
    totalSupply += _value;
    // increase `_to` address balance
    tokenBalances[_to] += _value;
    // create voting power associated with the tokens minted
    __moveVotingPower(address(0), votingDelegates[_to], _value);
    // fire a minted event
    emit Minted(msg.sender, _to, _value);
    // emit an improved transfer event
    emit Transferred(msg.sender, address(0), _to, _value);
    // fire ERC20 compliant transfer event
    emit Transfer(address(0), _to, _value);
  }
  /**
   * @dev Burns (destroys) some tokens from the address specified
   * @dev The value specified is treated as is without taking
   *      into account what `decimals` value is
   * @dev Behaves effectively as `burnFrom` function, allowing
   *      to specify an address to burn tokens from
   * @dev Requires sender to have `ROLE_TOKEN_DESTROYER` permission
   *
   * @param _from an address to burn some tokens from
   * @param _value an amount of tokens to burn (destroy)
   */
  function burn(address _from, uint256 _value) public {
    // check if caller has sufficient permissions to burn tokens
    // and if not - check for possibility to burn own tokens or to burn on behalf
    if(!isSenderInRole(ROLE_TOKEN_DESTROYER)) {
      // if `_from` is equal to sender, require own burns feature to be enabled
      // otherwise require burns on behalf feature to be enabled
      require(_from == msg.sender && isFeatureEnabled(FEATURE_OWN_BURNS)
           || _from != msg.sender && isFeatureEnabled(FEATURE_BURNS_ON_BEHALF),
              _from == msg.sender? "burns are disabled": "burns on behalf are disabled");
      // in case of burn on behalf
      if(_from != msg.sender) {
        // read allowance value - the amount of tokens allowed to be burnt - into the stack
        uint256 _allowance = transferAllowances[_from][msg.sender];
        // verify sender has an allowance to burn amount of tokens requested
        require(_allowance >= _value, "ERC20: burn amount exceeds allowance"); // Zeppelin msg
        // update allowance value on the stack
        _allowance -= _value;
        // update the allowance value in storage
        transferAllowances[_from][msg.sender] = _allowance;
        // emit an improved atomic approve event
        emit Approved(msg.sender, _from, _allowance + _value, _allowance);
        // emit an ERC20 approval event to reflect the decrease
        emit Approval(_from, msg.sender, _allowance);
      }
    }
    // at this point we know that either sender is ROLE_TOKEN_DESTROYER or
    // we burn own tokens or on behalf (in latest case we already checked and updated allowances)
    // we have left to execute balance checks and burning logic itself
    // non-zero burn value check
    require(_value != 0, "zero value burn");
    // non-zero source address check - Zeppelin
    require(_from != address(0), "ERC20: burn from the zero address"); // Zeppelin msg
    // verify `_from` address has enough tokens to destroy
    // (basically this is a arithmetic overflow check)
    require(tokenBalances[_from] >= _value, "ERC20: burn amount exceeds balance"); // Zeppelin msg
    // perform burn:
    // decrease `_from` address balance
    tokenBalances[_from] -= _value;
    // decrease total amount of tokens value
    totalSupply -= _value;
    // destroy voting power associated with the tokens burnt
    __moveVotingPower(votingDelegates[_from], address(0), _value);
    // fire a burnt event
    emit Burnt(msg.sender, _from, _value);
    // emit an improved transfer event
    emit Transferred(msg.sender, _from, address(0), _value);
    // fire ERC20 compliant transfer event
    emit Transfer(_from, address(0), _value);
  }
  // ===== End: Minting/burning extension =====
  // ===== Start: DAO Support (Compound-like voting delegation) =====
  /**
   * @notice Gets current voting power of the account `_of`
   * @param _of the address of account to get voting power of
   * @return current cumulative voting power of the account,
   *      sum of token balances of all its voting delegators
   */
  function getVotingPower(address _of) public view returns (uint256) {
    // get a link to an array of voting power history records for an address specified
    VotingPowerRecord[] storage history = votingPowerHistory[_of];
    // lookup the history and return latest element
    return history.length == 0? 0: history[history.length - 1].votingPower;
  }
  /**
   * @notice Gets past voting power of the account `_of` at some block `_blockNum`
   * @dev Throws if `_blockNum` is not in the past (not the finalized block)
   * @param _of the address of account to get voting power of
   * @param _blockNum block number to get the voting power at
   * @return past cumulative voting power of the account,
   *      sum of token balances of all its voting delegators at block number `_blockNum`
   */
  function getVotingPowerAt(address _of, uint256 _blockNum) public view returns (uint256) {
    // make sure block number is not in the past (not the finalized block)
    require(_blockNum < block.number, "not yet determined"); // Compound msg
    // get a link to an array of voting power history records for an address specified
    VotingPowerRecord[] storage history = votingPowerHistory[_of];
    // if voting power history for the account provided is empty
    if(history.length == 0) {
      // than voting power is zero - return the result
      return 0;
    }
    // check latest voting power history record block number:
    // if history was not updated after the block of interest
    if(history[history.length - 1].blockNumber <= _blockNum) {
      // we're done - return last voting power record
      return getVotingPower(_of);
    }
    // check first voting power history record block number:
    // if history was never updated before the block of interest
    if(history[0].blockNumber > _blockNum) {
      // we're done - voting power at the block num of interest was zero
      return 0;
    }
    // `votingPowerHistory[_of]` is an array ordered by `blockNumber`, ascending;
    // apply binary search on `votingPowerHistory[_of]` to find such an entry number `i`, that
    // `votingPowerHistory[_of][i].blockNumber <= _blockNum`, but in the same time
    // `votingPowerHistory[_of][i + 1].blockNumber > _blockNum`
    // return the result - voting power found at index `i`
    return history[__binaryLookup(_of, _blockNum)].votingPower;
  }
  /**
   * @dev Reads an entire voting power history array for the delegate specified
   *
   * @param _of delegate to query voting power history for
   * @return voting power history array for the delegate of interest
   */
  function getVotingPowerHistory(address _of) public view returns(VotingPowerRecord[] memory) {
    // return an entire array as memory
    return votingPowerHistory[_of];
  }
  /**
   * @dev Returns length of the voting power history array for the delegate specified;
   *      useful since reading an entire array just to get its length is expensive (gas cost)
   *
   * @param _of delegate to query voting power history length for
   * @return voting power history array length for the delegate of interest
   */
  function getVotingPowerHistoryLength(address _of) public view returns(uint256) {
    // read array length and return
    return votingPowerHistory[_of].length;
  }
  /**
   * @notice Delegates voting power of the delegator `msg.sender` to the delegate `_to`
   *
   * @dev Accepts zero value address to delegate voting power to, effectively
   *      removing the delegate in that case
   *
   * @param _to address to delegate voting power to
   */
  function delegate(address _to) public {
    // verify delegations are enabled
    require(isFeatureEnabled(FEATURE_DELEGATIONS), "delegations are disabled");
    // delegate call to `__delegate`
    __delegate(msg.sender, _to);
  }
  /**
   * @notice Delegates voting power of the delegator (represented by its signature) to the delegate `_to`
   *
   * @dev Accepts zero value address to delegate voting power to, effectively
   *      removing the delegate in that case
   *
   * @dev Compliant with EIP-712: Ethereum typed structured data hashing and signing,
   *      see https://eips.ethereum.org/EIPS/eip-712
   *
   * @param _to address to delegate voting power to
   * @param _nonce nonce used to construct the signature, and used to validate it;
   *      nonce is increased by one after successful signature validation and vote delegation
   * @param _exp signature expiration time
   * @param v the recovery byte of the signature
   * @param r half of the ECDSA signature pair
   * @param s half of the ECDSA signature pair
   */
  function delegateWithSig(address _to, uint256 _nonce, uint256 _exp, uint8 v, bytes32 r, bytes32 s) public {
    // verify delegations on behalf are enabled
    require(isFeatureEnabled(FEATURE_DELEGATIONS_ON_BEHALF), "delegations on behalf are disabled");
    // build the EIP-712 contract domain separator
    bytes32 domainSeparator = keccak256(abi.encode(DOMAIN_TYPEHASH, keccak256(bytes(name)), block.chainid, address(this)));
    // build the EIP-712 hashStruct of the delegation message
    bytes32 hashStruct = keccak256(abi.encode(DELEGATION_TYPEHASH, _to, _nonce, _exp));
    // calculate the EIP-712 digest "\\x19\\x01" ‖ domainSeparator ‖ hashStruct(message)
    bytes32 digest = keccak256(abi.encodePacked("\\x19\\x01", domainSeparator, hashStruct));
    // recover the address who signed the message with v, r, s
    address signer = ecrecover(digest, v, r, s);
    // perform message integrity and security validations
    require(signer != address(0), "invalid signature"); // Compound msg
    require(_nonce == nonces[signer], "invalid nonce"); // Compound msg
    require(block.timestamp < _exp, "signature expired"); // Compound msg
    // update the nonce for that particular signer to avoid replay attack
    nonces[signer]++;
    // delegate call to `__delegate` - execute the logic required
    __delegate(signer, _to);
  }
  /**
   * @dev Auxiliary function to delegate delegator's `_from` voting power to the delegate `_to`
   * @dev Writes to `votingDelegates` and `votingPowerHistory` mappings
   *
   * @param _from delegator who delegates his voting power
   * @param _to delegate who receives the voting power
   */
  function __delegate(address _from, address _to) private {
    // read current delegate to be replaced by a new one
    address _fromDelegate = votingDelegates[_from];
    // read current voting power (it is equal to token balance)
    uint256 _value = tokenBalances[_from];
    // reassign voting delegate to `_to`
    votingDelegates[_from] = _to;
    // update voting power for `_fromDelegate` and `_to`
    __moveVotingPower(_fromDelegate, _to, _value);
    // emit an event
    emit DelegateChanged(_from, _fromDelegate, _to);
  }
  /**
   * @dev Auxiliary function to move voting power `_value`
   *      from delegate `_from` to the delegate `_to`
   *
   * @dev Doesn't have any effect if `_from == _to`, or if `_value == 0`
   *
   * @param _from delegate to move voting power from
   * @param _to delegate to move voting power to
   * @param _value voting power to move from `_from` to `_to`
   */
  function __moveVotingPower(address _from, address _to, uint256 _value) private {
    // if there is no move (`_from == _to`) or there is nothing to move (`_value == 0`)
    if(_from == _to || _value == 0) {
      // return silently with no action
      return;
    }
    // if source address is not zero - decrease its voting power
    if(_from != address(0)) {
      // read current source address voting power
      uint256 _fromVal = getVotingPower(_from);
      // calculate decreased voting power
      // underflow is not possible by design:
      // voting power is limited by token balance which is checked by the callee
      uint256 _toVal = _fromVal - _value;
      // update source voting power from `_fromVal` to `_toVal`
      __updateVotingPower(_from, _fromVal, _toVal);
    }
    // if destination address is not zero - increase its voting power
    if(_to != address(0)) {
      // read current destination address voting power
      uint256 _fromVal = getVotingPower(_to);
      // calculate increased voting power
      // overflow is not possible by design:
      // max token supply limits the cumulative voting power
      uint256 _toVal = _fromVal + _value;
      // update destination voting power from `_fromVal` to `_toVal`
      __updateVotingPower(_to, _fromVal, _toVal);
    }
  }
  /**
   * @dev Auxiliary function to update voting power of the delegate `_of`
   *      from value `_fromVal` to value `_toVal`
   *
   * @param _of delegate to update its voting power
   * @param _fromVal old voting power of the delegate
   * @param _toVal new voting power of the delegate
   */
  function __updateVotingPower(address _of, uint256 _fromVal, uint256 _toVal) private {
    // get a link to an array of voting power history records for an address specified
    VotingPowerRecord[] storage history = votingPowerHistory[_of];
    // if there is an existing voting power value stored for current block
    if(history.length != 0 && history[history.length - 1].blockNumber == block.number) {
      // update voting power which is already stored in the current block
      history[history.length - 1].votingPower = uint192(_toVal);
    }
    // otherwise - if there is no value stored for current block
    else {
      // add new element into array representing the value for current block
      history.push(VotingPowerRecord(uint64(block.number), uint192(_toVal)));
    }
    // emit an event
    emit VotingPowerChanged(_of, _fromVal, _toVal);
  }
  /**
   * @dev Auxiliary function to lookup an element in a sorted (asc) array of elements
   *
   * @dev This function finds the closest element in an array to the value
   *      of interest (not exceeding that value) and returns its index within an array
   *
   * @dev An array to search in is `votingPowerHistory[_to][i].blockNumber`,
   *      it is sorted in ascending order (blockNumber increases)
   *
   * @param _to an address of the delegate to get an array for
   * @param n value of interest to look for
   * @return an index of the closest element in an array to the value
   *      of interest (not exceeding that value)
   */
  function __binaryLookup(address _to, uint256 n) private view returns(uint256) {
    // get a link to an array of voting power history records for an address specified
    VotingPowerRecord[] storage history = votingPowerHistory[_to];
    // left bound of the search interval, originally start of the array
    uint256 i = 0;
    // right bound of the search interval, originally end of the array
    uint256 j = history.length - 1;
    // the iteration process narrows down the bounds by
    // splitting the interval in a half oce per each iteration
    while(j > i) {
      // get an index in the middle of the interval [i, j]
      uint256 k = j - (j - i) / 2;
      // read an element to compare it with the value of interest
      VotingPowerRecord memory cp = history[k];
      // if we've got a strict equal - we're lucky and done
      if(cp.blockNumber == n) {
        // just return the result - index `k`
        return k;
      }
      // if the value of interest is bigger - move left bound to the middle
      else if (cp.blockNumber < n) {
        // move left bound `i` to the middle position `k`
        i = k;
      }
      // otherwise, when the value of interest is smaller - move right bound to the middle
      else {
        // move right bound `j` to the middle position `k - 1`:
        // element at position `k` is bigger and cannot be the result
        j = k - 1;
      }
    }
    // reaching that point means no exact match found
    // since we're interested in the element which is not bigger than the
    // element of interest, we return the lower bound `i`
    return i;
  }
}
// ===== End: DAO Support (Compound-like voting delegation) =====
// SPDX-License-Identifier: MIT
pragma solidity 0.8.1;
/**
 * @title Access Control List
 *
 * @notice Access control smart contract provides an API to check
 *      if specific operation is permitted globally and/or
 *      if particular user has a permission to execute it.
 *
 * @notice It deals with two main entities: features and roles.
 *
 * @notice Features are designed to be used to enable/disable specific
 *      functions (public functions) of the smart contract for everyone.
 * @notice User roles are designed to restrict access to specific
 *      functions (restricted functions) of the smart contract to some users.
 *
 * @notice Terms "role", "permissions" and "set of permissions" have equal meaning
 *      in the documentation text and may be used interchangeably.
 * @notice Terms "permission", "single permission" implies only one permission bit set.
 *
 * @dev This smart contract is designed to be inherited by other
 *      smart contracts which require access control management capabilities.
 *
 * @author Basil Gorin
 */
contract AccessControl {
  /**
   * @notice Access manager is responsible for assigning the roles to users,
   *      enabling/disabling global features of the smart contract
   * @notice Access manager can add, remove and update user roles,
   *      remove and update global features
   *
   * @dev Role ROLE_ACCESS_MANAGER allows modifying user roles and global features
   * @dev Role ROLE_ACCESS_MANAGER has single bit at position 255 enabled
   */
  uint256 public constant ROLE_ACCESS_MANAGER = 0x8000000000000000000000000000000000000000000000000000000000000000;
  /**
   * @dev Bitmask representing all the possible permissions (super admin role)
   * @dev Has all the bits are enabled (2^256 - 1 value)
   */
  uint256 private constant FULL_PRIVILEGES_MASK = type(uint256).max; // before 0.8.0: uint256(-1) overflows to 0xFFFF...
  /**
   * @notice Privileged addresses with defined roles/permissions
   * @notice In the context of ERC20/ERC721 tokens these can be permissions to
   *      allow minting or burning tokens, transferring on behalf and so on
   *
   * @dev Maps user address to the permissions bitmask (role), where each bit
   *      represents a permission
   * @dev Bitmask 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
   *      represents all possible permissions
   * @dev Zero address mapping represents global features of the smart contract
   */
  mapping(address => uint256) public userRoles;
  /**
   * @dev Fired in updateRole() and updateFeatures()
   *
   * @param _by operator which called the function
   * @param _to address which was granted/revoked permissions
   * @param _requested permissions requested
   * @param _actual permissions effectively set
   */
  event RoleUpdated(address indexed _by, address indexed _to, uint256 _requested, uint256 _actual);
  /**
   * @notice Creates an access control instance,
   *      setting contract creator to have full privileges
   */
  constructor() {
    // contract creator has full privileges
    userRoles[msg.sender] = FULL_PRIVILEGES_MASK;
  }
  /**
   * @notice Retrieves globally set of features enabled
   *
   * @dev Auxiliary getter function to maintain compatibility with previous
   *      versions of the Access Control List smart contract, where
   *      features was a separate uint256 public field
   *
   * @return 256-bit bitmask of the features enabled
   */
  function features() public view returns(uint256) {
    // according to new design features are stored in zero address
    // mapping of `userRoles` structure
    return userRoles[address(0)];
  }
  /**
   * @notice Updates set of the globally enabled features (`features`),
   *      taking into account sender's permissions
   *
   * @dev Requires transaction sender to have `ROLE_ACCESS_MANAGER` permission
   * @dev Function is left for backward compatibility with older versions
   *
   * @param _mask bitmask representing a set of features to enable/disable
   */
  function updateFeatures(uint256 _mask) public {
    // delegate call to `updateRole`
    updateRole(address(0), _mask);
  }
  /**
   * @notice Updates set of permissions (role) for a given user,
   *      taking into account sender's permissions.
   *
   * @dev Setting role to zero is equivalent to removing an all permissions
   * @dev Setting role to `FULL_PRIVILEGES_MASK` is equivalent to
   *      copying senders' permissions (role) to the user
   * @dev Requires transaction sender to have `ROLE_ACCESS_MANAGER` permission
   *
   * @param operator address of a user to alter permissions for or zero
   *      to alter global features of the smart contract
   * @param role bitmask representing a set of permissions to
   *      enable/disable for a user specified
   */
  function updateRole(address operator, uint256 role) public {
    // caller must have a permission to update user roles
    require(isSenderInRole(ROLE_ACCESS_MANAGER), "insufficient privileges (ROLE_ACCESS_MANAGER required)");
    // evaluate the role and reassign it
    userRoles[operator] = evaluateBy(msg.sender, userRoles[operator], role);
    // fire an event
    emit RoleUpdated(msg.sender, operator, role, userRoles[operator]);
  }
  /**
   * @notice Determines the permission bitmask an operator can set on the
   *      target permission set
   * @notice Used to calculate the permission bitmask to be set when requested
   *     in `updateRole` and `updateFeatures` functions
   *
   * @dev Calculated based on:
   *      1) operator's own permission set read from userRoles[operator]
   *      2) target permission set - what is already set on the target
   *      3) desired permission set - what do we want set target to
   *
   * @dev Corner cases:
   *      1) Operator is super admin and its permission set is `FULL_PRIVILEGES_MASK`:
   *        `desired` bitset is returned regardless of the `target` permission set value
   *        (what operator sets is what they get)
   *      2) Operator with no permissions (zero bitset):
   *        `target` bitset is returned regardless of the `desired` value
   *        (operator has no authority and cannot modify anything)
   *
   * @dev Example:
   *      Consider an operator with the permissions bitmask     00001111
   *      is about to modify the target permission set          01010101
   *      Operator wants to set that permission set to          00110011
   *      Based on their role, an operator has the permissions
   *      to update only lowest 4 bits on the target, meaning that
   *      high 4 bits of the target set in this example is left
   *      unchanged and low 4 bits get changed as desired:      01010011
   *
   * @param operator address of the contract operator which is about to set the permissions
   * @param target input set of permissions to operator is going to modify
   * @param desired desired set of permissions operator would like to set
   * @return resulting set of permissions given operator will set
   */
  function evaluateBy(address operator, uint256 target, uint256 desired) public view returns(uint256) {
    // read operator's permissions
    uint256 p = userRoles[operator];
    // taking into account operator's permissions,
    // 1) enable the permissions desired on the `target`
    target |= p & desired;
    // 2) disable the permissions desired on the `target`
    target &= FULL_PRIVILEGES_MASK ^ (p & (FULL_PRIVILEGES_MASK ^ desired));
    // return calculated result
    return target;
  }
  /**
   * @notice Checks if requested set of features is enabled globally on the contract
   *
   * @param required set of features to check against
   * @return true if all the features requested are enabled, false otherwise
   */
  function isFeatureEnabled(uint256 required) public view returns(bool) {
    // delegate call to `__hasRole`, passing `features` property
    return __hasRole(features(), required);
  }
  /**
   * @notice Checks if transaction sender `msg.sender` has all the permissions required
   *
   * @param required set of permissions (role) to check against
   * @return true if all the permissions requested are enabled, false otherwise
   */
  function isSenderInRole(uint256 required) public view returns(bool) {
    // delegate call to `isOperatorInRole`, passing transaction sender
    return isOperatorInRole(msg.sender, required);
  }
  /**
   * @notice Checks if operator has all the permissions (role) required
   *
   * @param operator address of the user to check role for
   * @param required set of permissions (role) to check
   * @return true if all the permissions requested are enabled, false otherwise
   */
  function isOperatorInRole(address operator, uint256 required) public view returns(bool) {
    // delegate call to `__hasRole`, passing operator's permissions (role)
    return __hasRole(userRoles[operator], required);
  }
  /**
   * @dev Checks if role `actual` contains all the permissions required `required`
   *
   * @param actual existent role
   * @param required required role
   * @return true if actual has required role (all permissions), false otherwise
   */
  function __hasRole(uint256 actual, uint256 required) internal pure returns(bool) {
    // check the bitmask for the role required and return the result
    return actual & required == required;
  }
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.1;
/**
 * @title Address Utils
 *
 * @dev Utility library of inline functions on addresses
 *
 * @author Basil Gorin
 */
library AddressUtils {
  /**
   * @notice Checks if the target address is a contract
   * @dev This function will return false if invoked during the constructor of a contract,
   *      as the code is not actually created until after the constructor finishes.
   * @param addr address to check
   * @return whether the target address is a contract
   */
  function isContract(address addr) internal view returns (bool) {
    // a variable to load `extcodesize` to
    uint256 size = 0;
    // XXX Currently there is no better way to check if there is a contract in an address
    // than to check the size of the code at that address.
    // See https://ethereum.stackexchange.com/a/14016/36603 for more details about how this works.
    // TODO: Check this again before the Serenity release, because all addresses will be contracts.
    // solium-disable-next-line security/no-inline-assembly
    assembly {
      // retrieve the size of the code at address `addr`
      size := extcodesize(addr)
    }
    // positive size indicates a smart contract address
    return size > 0;
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)
pragma solidity >= 0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);
    /**
     * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}// SPDX-License-Identifier: UNLICENSED
pragma solidity >= 0.8.0;
interface IRedSnwapper {
    struct InputToken {
        address token;
        uint256 amountIn;
        address transferTo;
    }
    struct OutputToken {
        address token;
        address recipient;
        uint256 amountOutMin;
    }
    struct Executor {
        address executor;
        uint256 value;
        bytes data;
    }
    function snwap(
        address tokenIn,
        uint256 amountIn,
        address recipient,
        address tokenOut,
        uint256 amountOutMin,
        address executor,
        bytes calldata executorData
    ) external returns (uint256 amountOut);
    function snwapMultiple(
        InputToken[] calldata inputTokens,
        OutputToken[] calldata outputTokens,
        Executor[] calldata executors
    ) external returns (uint256[] memory amountOut);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 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 {
        _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 v4.8.0) (access/Ownable2Step.sol)
pragma solidity ^0.8.0;
import "./Ownable.sol";
/**
 * @dev Contract module which provides 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} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;
    event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Returns the address of the pending owner.
     */
    function pendingOwner() public view virtual returns (address) {
        return _pendingOwner;
    }
    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }
    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() external {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }
}
// 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: GPL-3.0-or-later
pragma solidity >=0.8.0;
import "openzeppelin/access/Ownable2Step.sol";
abstract contract Auth is Ownable2Step {
    event SetTrusted(address indexed user, bool isTrusted);
    mapping(address => bool) public trusted;
    error OnlyTrusted();
    modifier onlyTrusted() {
        if (!trusted[msg.sender]) revert OnlyTrusted();
        _;
    }
    constructor(address trustedUser) {
        trusted[trustedUser] = true;
        emit SetTrusted(trustedUser, true);
    }
    function setTrusted(address user, bool isTrusted) external onlyOwner {
        trusted[user] = isTrusted;
        emit SetTrusted(user, isTrusted);
    }
}// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.8.0;
import "interfaces/IRedSnwapper.sol";
import "interfaces/IERC20.sol";
import "./Auth.sol";
/// @title TokenChwomper for selling accumulated tokens for weth or other base assets
/// @notice This contract will be used for fee collection and breakdown
/// @dev Uses Auth contract for 2-step owner process and trust operators to guard functions
contract TokenChwomper is Auth {
  address public immutable weth;
  IRedSnwapper public redSnwapper;
  bytes4 private constant TRANSFER_SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)')));
  error TransferFailed();
  constructor(
    address _operator,
    address _redSnwapper,
    address _weth
  ) Auth(_operator) {
    // initial owner is msg.sender
    redSnwapper = IRedSnwapper(_redSnwapper);
    weth = _weth;
  }
  /// @notice Updates the RedSnwapper to be used for swapping tokens
  /// @dev make sure new RedSnwapper is backwards compatiable (should be)
  /// @param _redSnwapper The address of the new route processor
  function updateRedSnwapper(address _redSnwapper) external onlyOwner {
    redSnwapper = IRedSnwapper(_redSnwapper);
  }
  
  /// @notice Swaps tokens via the configured RedSnwapper
  /// @dev Must be called by a trusted operator
  /// @param tokenIn Address of the input token
  /// @param amountIn Amount of the input token to swap
  /// @param recipient Address to receive the output tokens
  /// @param tokenOut Address of the output token
  /// @param amountOutMin Minimum acceptable amount of output tokens (slippage protection)
  /// @param executor Address of the executor contract to perform the swap logic
  /// @param executorData Encoded data for the executor call
  /// @return amountOut The actual amount of output tokens received
  function snwap(
    address tokenIn,
    uint256 amountIn,
    address recipient,
    address tokenOut,
    uint256 amountOutMin,
    address executor,
    bytes calldata executorData
  ) external onlyTrusted returns (uint256 amountOut) {
     // Pre-fund RedSnwapper with input tokens
     _safeTransfer(tokenIn, address(redSnwapper), amountIn);
    // Execute snwap with zero amountIn
    amountOut = redSnwapper.snwap(
      tokenIn,
      0,
      recipient,
      tokenOut,
      amountOutMin,
      executor,
      executorData
    );
  }
  /// @notice Performs multiple swaps via the configured RedSnwapper
  /// @dev Must be called by a trusted operator
  /// @param inputTokens Array of input token parameters
  /// @param outputTokens Array of output token requirements
  /// @param executors Array of executor calls to perform
  /// @return amountOut Array of actual amounts of output tokens received
  function snwapMultiple(
    IRedSnwapper.InputToken[] calldata inputTokens,
    IRedSnwapper.OutputToken[] calldata outputTokens,
    IRedSnwapper.Executor[] calldata executors
  ) external onlyTrusted returns (uint256[] memory amountOut) {
   uint256 length = inputTokens.length;
    IRedSnwapper.InputToken[] memory _inputTokens = new IRedSnwapper.InputToken[](length);
    for (uint256 i = 0; i < length; ++i) {
        // Pre-fund RedSnwapper with input tokens
        _safeTransfer(
            inputTokens[i].token,
            address(redSnwapper),
            inputTokens[i].amountIn
        );
        // Build _inputTokens with zero amountIn
        _inputTokens[i] = IRedSnwapper.InputToken({
            token: inputTokens[i].token,
            amountIn: 0,
            transferTo: inputTokens[i].transferTo
        });
    }
    // Execute snwapMultiple
    amountOut = redSnwapper.snwapMultiple(
        _inputTokens,
        outputTokens,
        executors
    );
  }
  /// @notice Withdraw any token or eth from the contract
  /// @dev can only be called by owner
  /// @param token The address of the token to be withdrawn, 0x0 for eth
  /// @param to The address to send the token to
  /// @param _value The amount of the token to be withdrawn
  function withdraw(address token, address to, uint256 _value) onlyOwner external {
    if (token != address(0)) {
      _safeTransfer(token, to, _value);
    } 
    else {
      (bool success, ) = to.call{value: _value}("");
      require(success);
    }
  }
  
  function _safeTransfer(address token, address to, uint value) internal {
    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(TRANSFER_SELECTOR, to, value));
    if (!success || (data.length != 0 && !abi.decode(data, (bool)))) revert TransferFailed();
  }
  /// @notice In case we receive any unwrapped eth (native token) we can call this
  /// @dev operators can call this 
  function wrapEth() onlyTrusted external {
    weth.call{value: address(this).balance}("");
  }
  /// @notice Available function in case we need to do any calls that aren't supported by the contract (unwinding lp positions, etc.)
  /// @dev can only be called by owner
  /// @param to The address to send the call to
  /// @param _value The amount of eth to send with the call
  /// @param data The data to be sent with the call
  function doAction(address to, uint256 _value, bytes memory data) onlyOwner external {
    (bool success, ) = to.call{value: _value}(data);
    require(success);
  }
  receive() external payable {}
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 ^0.8.0 ^0.8.17 ^0.8.4;

// lib/solmate/src/tokens/ERC20.sol

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 amount);

    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /*//////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    uint8 public immutable decimals;

    /*//////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowance;

    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*//////////////////////////////////////////////////////////////
                               ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);

        return true;
    }

    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(msg.sender, to, amount);

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(address(0), to, amount);
    }

    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

        emit Transfer(from, address(0), amount);
    }
}

// src/Errors/GenericErrors.sol

/// @custom:version 1.0.1

error AlreadyInitialized();
error CannotAuthoriseSelf();
error CannotBridgeToSameNetwork();
error ContractCallNotAllowed();
error CumulativeSlippageTooHigh(uint256 minAmount, uint256 receivedAmount);
error DiamondIsPaused();
error ETHTransferFailed();
error ExternalCallFailed();
error FunctionDoesNotExist();
error InformationMismatch();
error InsufficientBalance(uint256 required, uint256 balance);
error InvalidAmount();
error InvalidCallData();
error InvalidConfig();
error InvalidContract();
error InvalidDestinationChain();
error InvalidFallbackAddress();
error InvalidReceiver();
error InvalidSendingToken();
error NativeAssetNotSupported();
error NativeAssetTransferFailed();
error NoSwapDataProvided();
error NoSwapFromZeroBalance();
error NotAContract();
error NotInitialized();
error NoTransferToNullAddress();
error NullAddrIsNotAnERC20Token();
error NullAddrIsNotAValidSpender();
error OnlyContractOwner();
error RecoveryAddressCannotBeZero();
error ReentrancyError();
error TokenNotSupported();
error TransferFromFailed();
error UnAuthorized();
error UnsupportedChainId(uint256 chainId);
error WithdrawFailed();
error ZeroAmount();

// lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol

// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

    /**
     * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}

// src/Interfaces/ILiFi.sol

/// @title LIFI Interface
/// @author LI.FI (https://li.fi)
/// @custom:version 1.0.0
interface ILiFi {
    /// Structs ///

    struct BridgeData {
        bytes32 transactionId;
        string bridge;
        string integrator;
        address referrer;
        address sendingAssetId;
        address receiver;
        uint256 minAmount;
        uint256 destinationChainId;
        bool hasSourceSwaps;
        bool hasDestinationCall;
    }

    /// Events ///

    event LiFiTransferStarted(ILiFi.BridgeData bridgeData);

    event LiFiTransferCompleted(
        bytes32 indexed transactionId,
        address receivingAssetId,
        address receiver,
        uint256 amount,
        uint256 timestamp
    );

    event LiFiTransferRecovered(
        bytes32 indexed transactionId,
        address receivingAssetId,
        address receiver,
        uint256 amount,
        uint256 timestamp
    );

    event LiFiGenericSwapCompleted(
        bytes32 indexed transactionId,
        string integrator,
        string referrer,
        address receiver,
        address fromAssetId,
        address toAssetId,
        uint256 fromAmount,
        uint256 toAmount
    );

    // Deprecated but kept here to include in ABI to parse historic events
    event LiFiSwappedGeneric(
        bytes32 indexed transactionId,
        string integrator,
        string referrer,
        address fromAssetId,
        address toAssetId,
        uint256 fromAmount,
        uint256 toAmount
    );
}

// src/Libraries/LibBytes.sol

/// @custom:version 1.0.0

library LibBytes {
    // solhint-disable no-inline-assembly

    // LibBytes specific errors
    error SliceOverflow();
    error SliceOutOfBounds();
    error AddressOutOfBounds();

    bytes16 private constant _SYMBOLS = "0123456789abcdef";

    // -------------------------

    function slice(
        bytes memory _bytes,
        uint256 _start,
        uint256 _length
    ) internal pure returns (bytes memory) {
        if (_length + 31 < _length) revert SliceOverflow();
        if (_bytes.length < _start + _length) revert SliceOutOfBounds();

        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) {
        if (_bytes.length < _start + 20) {
            revert AddressOutOfBounds();
        }
        address tempAddress;

        assembly {
            tempAddress := div(
                mload(add(add(_bytes, 0x20), _start)),
                0x1000000000000000000000000
            )
        }

        return tempAddress;
    }

    /// Copied from OpenZeppelin's `Strings.sol` utility library.
    /// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/8335676b0e99944eef6a742e16dcd9ff6e68e609/contracts/utils/Strings.sol
    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);
    }
}

// lib/solady/src/utils/SafeTransferLib.sol

/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/SafeTransferLib.sol)
/// @author Modified from Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeTransferLib.sol)
/// @author Permit2 operations from (https://github.com/Uniswap/permit2/blob/main/src/libraries/Permit2Lib.sol)
///
/// @dev Note:
/// - For ETH transfers, please use `forceSafeTransferETH` for DoS protection.
/// - For ERC20s, this implementation won't check that a token has code,
///   responsibility is delegated to the caller.
library SafeTransferLib_0 {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       CUSTOM ERRORS                        */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The ETH transfer has failed.
    error ETHTransferFailed();

    /// @dev The ERC20 `transferFrom` has failed.
    error TransferFromFailed();

    /// @dev The ERC20 `transfer` has failed.
    error TransferFailed();

    /// @dev The ERC20 `approve` has failed.
    error ApproveFailed();

    /// @dev The Permit2 operation has failed.
    error Permit2Failed();

    /// @dev The Permit2 amount must be less than `2**160 - 1`.
    error Permit2AmountOverflow();

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                         CONSTANTS                          */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Suggested gas stipend for contract receiving ETH that disallows any storage writes.
    uint256 internal constant GAS_STIPEND_NO_STORAGE_WRITES = 2300;

    /// @dev Suggested gas stipend for contract receiving ETH to perform a few
    /// storage reads and writes, but low enough to prevent griefing.
    uint256 internal constant GAS_STIPEND_NO_GRIEF = 100000;

    /// @dev The unique EIP-712 domain domain separator for the DAI token contract.
    bytes32 internal constant DAI_DOMAIN_SEPARATOR =
        0xdbb8cf42e1ecb028be3f3dbc922e1d878b963f411dc388ced501601c60f7c6f7;

    /// @dev The address for the WETH9 contract on Ethereum mainnet.
    address internal constant WETH9 = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;

    /// @dev The canonical Permit2 address.
    /// [Github](https://github.com/Uniswap/permit2)
    /// [Etherscan](https://etherscan.io/address/0x000000000022D473030F116dDEE9F6B43aC78BA3)
    address internal constant PERMIT2 = 0x000000000022D473030F116dDEE9F6B43aC78BA3;

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       ETH OPERATIONS                       */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    // If the ETH transfer MUST succeed with a reasonable gas budget, use the force variants.
    //
    // The regular variants:
    // - Forwards all remaining gas to the target.
    // - Reverts if the target reverts.
    // - Reverts if the current contract has insufficient balance.
    //
    // The force variants:
    // - Forwards with an optional gas stipend
    //   (defaults to `GAS_STIPEND_NO_GRIEF`, which is sufficient for most cases).
    // - If the target reverts, or if the gas stipend is exhausted,
    //   creates a temporary contract to force send the ETH via `SELFDESTRUCT`.
    //   Future compatible with `SENDALL`: https://eips.ethereum.org/EIPS/eip-4758.
    // - Reverts if the current contract has insufficient balance.
    //
    // The try variants:
    // - Forwards with a mandatory gas stipend.
    // - Instead of reverting, returns whether the transfer succeeded.

    /// @dev Sends `amount` (in wei) ETH to `to`.
    function safeTransferETH(address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            if iszero(call(gas(), to, amount, codesize(), 0x00, codesize(), 0x00)) {
                mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`.
                revert(0x1c, 0x04)
            }
        }
    }

    /// @dev Sends all the ETH in the current contract to `to`.
    function safeTransferAllETH(address to) internal {
        /// @solidity memory-safe-assembly
        assembly {
            // Transfer all the ETH and check if it succeeded or not.
            if iszero(call(gas(), to, selfbalance(), codesize(), 0x00, codesize(), 0x00)) {
                mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`.
                revert(0x1c, 0x04)
            }
        }
    }

    /// @dev Force sends `amount` (in wei) ETH to `to`, with a `gasStipend`.
    function forceSafeTransferETH(address to, uint256 amount, uint256 gasStipend) internal {
        /// @solidity memory-safe-assembly
        assembly {
            if lt(selfbalance(), amount) {
                mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`.
                revert(0x1c, 0x04)
            }
            if iszero(call(gasStipend, to, amount, codesize(), 0x00, codesize(), 0x00)) {
                mstore(0x00, to) // Store the address in scratch space.
                mstore8(0x0b, 0x73) // Opcode `PUSH20`.
                mstore8(0x20, 0xff) // Opcode `SELFDESTRUCT`.
                if iszero(create(amount, 0x0b, 0x16)) { revert(codesize(), codesize()) } // For gas estimation.
            }
        }
    }

    /// @dev Force sends all the ETH in the current contract to `to`, with a `gasStipend`.
    function forceSafeTransferAllETH(address to, uint256 gasStipend) internal {
        /// @solidity memory-safe-assembly
        assembly {
            if iszero(call(gasStipend, to, selfbalance(), codesize(), 0x00, codesize(), 0x00)) {
                mstore(0x00, to) // Store the address in scratch space.
                mstore8(0x0b, 0x73) // Opcode `PUSH20`.
                mstore8(0x20, 0xff) // Opcode `SELFDESTRUCT`.
                if iszero(create(selfbalance(), 0x0b, 0x16)) { revert(codesize(), codesize()) } // For gas estimation.
            }
        }
    }

    /// @dev Force sends `amount` (in wei) ETH to `to`, with `GAS_STIPEND_NO_GRIEF`.
    function forceSafeTransferETH(address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            if lt(selfbalance(), amount) {
                mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`.
                revert(0x1c, 0x04)
            }
            if iszero(call(GAS_STIPEND_NO_GRIEF, to, amount, codesize(), 0x00, codesize(), 0x00)) {
                mstore(0x00, to) // Store the address in scratch space.
                mstore8(0x0b, 0x73) // Opcode `PUSH20`.
                mstore8(0x20, 0xff) // Opcode `SELFDESTRUCT`.
                if iszero(create(amount, 0x0b, 0x16)) { revert(codesize(), codesize()) } // For gas estimation.
            }
        }
    }

    /// @dev Force sends all the ETH in the current contract to `to`, with `GAS_STIPEND_NO_GRIEF`.
    function forceSafeTransferAllETH(address to) internal {
        /// @solidity memory-safe-assembly
        assembly {
            // forgefmt: disable-next-item
            if iszero(call(GAS_STIPEND_NO_GRIEF, to, selfbalance(), codesize(), 0x00, codesize(), 0x00)) {
                mstore(0x00, to) // Store the address in scratch space.
                mstore8(0x0b, 0x73) // Opcode `PUSH20`.
                mstore8(0x20, 0xff) // Opcode `SELFDESTRUCT`.
                if iszero(create(selfbalance(), 0x0b, 0x16)) { revert(codesize(), codesize()) } // For gas estimation.
            }
        }
    }

    /// @dev Sends `amount` (in wei) ETH to `to`, with a `gasStipend`.
    function trySafeTransferETH(address to, uint256 amount, uint256 gasStipend)
        internal
        returns (bool success)
    {
        /// @solidity memory-safe-assembly
        assembly {
            success := call(gasStipend, to, amount, codesize(), 0x00, codesize(), 0x00)
        }
    }

    /// @dev Sends all the ETH in the current contract to `to`, with a `gasStipend`.
    function trySafeTransferAllETH(address to, uint256 gasStipend)
        internal
        returns (bool success)
    {
        /// @solidity memory-safe-assembly
        assembly {
            success := call(gasStipend, to, selfbalance(), codesize(), 0x00, codesize(), 0x00)
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                      ERC20 OPERATIONS                      */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Sends `amount` of ERC20 `token` from `from` to `to`.
    /// Reverts upon failure.
    ///
    /// The `from` account must have at least `amount` approved for
    /// the current contract to manage.
    function safeTransferFrom(address token, address from, address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Cache the free memory pointer.
            mstore(0x60, amount) // Store the `amount` argument.
            mstore(0x40, to) // Store the `to` argument.
            mstore(0x2c, shl(96, from)) // Store the `from` argument.
            mstore(0x0c, 0x23b872dd000000000000000000000000) // `transferFrom(address,address,uint256)`.
            // Perform the transfer, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                    call(gas(), token, 0, 0x1c, 0x64, 0x00, 0x20)
                )
            ) {
                mstore(0x00, 0x7939f424) // `TransferFromFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x60, 0) // Restore the zero slot to zero.
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }

    /// @dev Sends `amount` of ERC20 `token` from `from` to `to`.
    ///
    /// The `from` account must have at least `amount` approved for the current contract to manage.
    function trySafeTransferFrom(address token, address from, address to, uint256 amount)
        internal
        returns (bool success)
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Cache the free memory pointer.
            mstore(0x60, amount) // Store the `amount` argument.
            mstore(0x40, to) // Store the `to` argument.
            mstore(0x2c, shl(96, from)) // Store the `from` argument.
            mstore(0x0c, 0x23b872dd000000000000000000000000) // `transferFrom(address,address,uint256)`.
            success :=
                and( // The arguments of `and` are evaluated from right to left.
                    or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                    call(gas(), token, 0, 0x1c, 0x64, 0x00, 0x20)
                )
            mstore(0x60, 0) // Restore the zero slot to zero.
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }

    /// @dev Sends all of ERC20 `token` from `from` to `to`.
    /// Reverts upon failure.
    ///
    /// The `from` account must have their entire balance approved for the current contract to manage.
    function safeTransferAllFrom(address token, address from, address to)
        internal
        returns (uint256 amount)
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Cache the free memory pointer.
            mstore(0x40, to) // Store the `to` argument.
            mstore(0x2c, shl(96, from)) // Store the `from` argument.
            mstore(0x0c, 0x70a08231000000000000000000000000) // `balanceOf(address)`.
            // Read the balance, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    gt(returndatasize(), 0x1f), // At least 32 bytes returned.
                    staticcall(gas(), token, 0x1c, 0x24, 0x60, 0x20)
                )
            ) {
                mstore(0x00, 0x7939f424) // `TransferFromFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x00, 0x23b872dd) // `transferFrom(address,address,uint256)`.
            amount := mload(0x60) // The `amount` is already at 0x60. We'll need to return it.
            // Perform the transfer, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                    call(gas(), token, 0, 0x1c, 0x64, 0x00, 0x20)
                )
            ) {
                mstore(0x00, 0x7939f424) // `TransferFromFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x60, 0) // Restore the zero slot to zero.
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }

    /// @dev Sends `amount` of ERC20 `token` from the current contract to `to`.
    /// Reverts upon failure.
    function safeTransfer(address token, address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x14, to) // Store the `to` argument.
            mstore(0x34, amount) // Store the `amount` argument.
            mstore(0x00, 0xa9059cbb000000000000000000000000) // `transfer(address,uint256)`.
            // Perform the transfer, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                    call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
                )
            ) {
                mstore(0x00, 0x90b8ec18) // `TransferFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten.
        }
    }

    /// @dev Sends all of ERC20 `token` from the current contract to `to`.
    /// Reverts upon failure.
    function safeTransferAll(address token, address to) internal returns (uint256 amount) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, 0x70a08231) // Store the function selector of `balanceOf(address)`.
            mstore(0x20, address()) // Store the address of the current contract.
            // Read the balance, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    gt(returndatasize(), 0x1f), // At least 32 bytes returned.
                    staticcall(gas(), token, 0x1c, 0x24, 0x34, 0x20)
                )
            ) {
                mstore(0x00, 0x90b8ec18) // `TransferFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x14, to) // Store the `to` argument.
            amount := mload(0x34) // The `amount` is already at 0x34. We'll need to return it.
            mstore(0x00, 0xa9059cbb000000000000000000000000) // `transfer(address,uint256)`.
            // Perform the transfer, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                    call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
                )
            ) {
                mstore(0x00, 0x90b8ec18) // `TransferFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten.
        }
    }

    /// @dev Sets `amount` of ERC20 `token` for `to` to manage on behalf of the current contract.
    /// Reverts upon failure.
    function safeApprove(address token, address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x14, to) // Store the `to` argument.
            mstore(0x34, amount) // Store the `amount` argument.
            mstore(0x00, 0x095ea7b3000000000000000000000000) // `approve(address,uint256)`.
            // Perform the approval, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                    call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
                )
            ) {
                mstore(0x00, 0x3e3f8f73) // `ApproveFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten.
        }
    }

    /// @dev Sets `amount` of ERC20 `token` for `to` to manage on behalf of the current contract.
    /// If the initial attempt to approve fails, attempts to reset the approved amount to zero,
    /// then retries the approval again (some tokens, e.g. USDT, requires this).
    /// Reverts upon failure.
    function safeApproveWithRetry(address token, address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x14, to) // Store the `to` argument.
            mstore(0x34, amount) // Store the `amount` argument.
            mstore(0x00, 0x095ea7b3000000000000000000000000) // `approve(address,uint256)`.
            // Perform the approval, retrying upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                    call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
                )
            ) {
                mstore(0x34, 0) // Store 0 for the `amount`.
                mstore(0x00, 0x095ea7b3000000000000000000000000) // `approve(address,uint256)`.
                pop(call(gas(), token, 0, 0x10, 0x44, codesize(), 0x00)) // Reset the approval.
                mstore(0x34, amount) // Store back the original `amount`.
                // Retry the approval, reverting upon failure.
                if iszero(
                    and(
                        or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                        call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
                    )
                ) {
                    mstore(0x00, 0x3e3f8f73) // `ApproveFailed()`.
                    revert(0x1c, 0x04)
                }
            }
            mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten.
        }
    }

    /// @dev Returns the amount of ERC20 `token` owned by `account`.
    /// Returns zero if the `token` does not exist.
    function balanceOf(address token, address account) internal view returns (uint256 amount) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x14, account) // Store the `account` argument.
            mstore(0x00, 0x70a08231000000000000000000000000) // `balanceOf(address)`.
            amount :=
                mul( // The arguments of `mul` are evaluated from right to left.
                    mload(0x20),
                    and( // The arguments of `and` are evaluated from right to left.
                        gt(returndatasize(), 0x1f), // At least 32 bytes returned.
                        staticcall(gas(), token, 0x10, 0x24, 0x20, 0x20)
                    )
                )
        }
    }

    /// @dev Sends `amount` of ERC20 `token` from `from` to `to`.
    /// If the initial attempt fails, try to use Permit2 to transfer the token.
    /// Reverts upon failure.
    ///
    /// The `from` account must have at least `amount` approved for the current contract to manage.
    function safeTransferFrom2(address token, address from, address to, uint256 amount) internal {
        if (!trySafeTransferFrom(token, from, to, amount)) {
            permit2TransferFrom(token, from, to, amount);
        }
    }

    /// @dev Sends `amount` of ERC20 `token` from `from` to `to` via Permit2.
    /// Reverts upon failure.
    function permit2TransferFrom(address token, address from, address to, uint256 amount)
        internal
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40)
            mstore(add(m, 0x74), shr(96, shl(96, token)))
            mstore(add(m, 0x54), amount)
            mstore(add(m, 0x34), to)
            mstore(add(m, 0x20), shl(96, from))
            // `transferFrom(address,address,uint160,address)`.
            mstore(m, 0x36c78516000000000000000000000000)
            let p := PERMIT2
            let exists := eq(chainid(), 1)
            if iszero(exists) { exists := iszero(iszero(extcodesize(p))) }
            if iszero(and(call(gas(), p, 0, add(m, 0x10), 0x84, codesize(), 0x00), exists)) {
                mstore(0x00, 0x7939f4248757f0fd) // `TransferFromFailed()` or `Permit2AmountOverflow()`.
                revert(add(0x18, shl(2, iszero(iszero(shr(160, amount))))), 0x04)
            }
        }
    }

    /// @dev Permit a user to spend a given amount of
    /// another user's tokens via native EIP-2612 permit if possible, falling
    /// back to Permit2 if native permit fails or is not implemented on the token.
    function permit2(
        address token,
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        bool success;
        /// @solidity memory-safe-assembly
        assembly {
            for {} shl(96, xor(token, WETH9)) {} {
                mstore(0x00, 0x3644e515) // `DOMAIN_SEPARATOR()`.
                if iszero(
                    and( // The arguments of `and` are evaluated from right to left.
                        lt(iszero(mload(0x00)), eq(returndatasize(), 0x20)), // Returns 1 non-zero word.
                        // Gas stipend to limit gas burn for tokens that don't refund gas when
                        // an non-existing function is called. 5K should be enough for a SLOAD.
                        staticcall(5000, token, 0x1c, 0x04, 0x00, 0x20)
                    )
                ) { break }
                // After here, we can be sure that token is a contract.
                let m := mload(0x40)
                mstore(add(m, 0x34), spender)
                mstore(add(m, 0x20), shl(96, owner))
                mstore(add(m, 0x74), deadline)
                if eq(mload(0x00), DAI_DOMAIN_SEPARATOR) {
                    mstore(0x14, owner)
                    mstore(0x00, 0x7ecebe00000000000000000000000000) // `nonces(address)`.
                    mstore(add(m, 0x94), staticcall(gas(), token, 0x10, 0x24, add(m, 0x54), 0x20))
                    mstore(m, 0x8fcbaf0c000000000000000000000000) // `IDAIPermit.permit`.
                    // `nonces` is already at `add(m, 0x54)`.
                    // `1` is already stored at `add(m, 0x94)`.
                    mstore(add(m, 0xb4), and(0xff, v))
                    mstore(add(m, 0xd4), r)
                    mstore(add(m, 0xf4), s)
                    success := call(gas(), token, 0, add(m, 0x10), 0x104, codesize(), 0x00)
                    break
                }
                mstore(m, 0xd505accf000000000000000000000000) // `IERC20Permit.permit`.
                mstore(add(m, 0x54), amount)
                mstore(add(m, 0x94), and(0xff, v))
                mstore(add(m, 0xb4), r)
                mstore(add(m, 0xd4), s)
                success := call(gas(), token, 0, add(m, 0x10), 0xe4, codesize(), 0x00)
                break
            }
        }
        if (!success) simplePermit2(token, owner, spender, amount, deadline, v, r, s);
    }

    /// @dev Simple permit on the Permit2 contract.
    function simplePermit2(
        address token,
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40)
            mstore(m, 0x927da105) // `allowance(address,address,address)`.
            {
                let addressMask := shr(96, not(0))
                mstore(add(m, 0x20), and(addressMask, owner))
                mstore(add(m, 0x40), and(addressMask, token))
                mstore(add(m, 0x60), and(addressMask, spender))
                mstore(add(m, 0xc0), and(addressMask, spender))
            }
            let p := mul(PERMIT2, iszero(shr(160, amount)))
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    gt(returndatasize(), 0x5f), // Returns 3 words: `amount`, `expiration`, `nonce`.
                    staticcall(gas(), p, add(m, 0x1c), 0x64, add(m, 0x60), 0x60)
                )
            ) {
                mstore(0x00, 0x6b836e6b8757f0fd) // `Permit2Failed()` or `Permit2AmountOverflow()`.
                revert(add(0x18, shl(2, iszero(p))), 0x04)
            }
            mstore(m, 0x2b67b570) // `Permit2.permit` (PermitSingle variant).
            // `owner` is already `add(m, 0x20)`.
            // `token` is already at `add(m, 0x40)`.
            mstore(add(m, 0x60), amount)
            mstore(add(m, 0x80), 0xffffffffffff) // `expiration = type(uint48).max`.
            // `nonce` is already at `add(m, 0xa0)`.
            // `spender` is already at `add(m, 0xc0)`.
            mstore(add(m, 0xe0), deadline)
            mstore(add(m, 0x100), 0x100) // `signature` offset.
            mstore(add(m, 0x120), 0x41) // `signature` length.
            mstore(add(m, 0x140), r)
            mstore(add(m, 0x160), s)
            mstore(add(m, 0x180), shl(248, v))
            if iszero(call(gas(), p, 0, add(m, 0x1c), 0x184, codesize(), 0x00)) {
                mstore(0x00, 0x6b836e6b) // `Permit2Failed()`.
                revert(0x1c, 0x04)
            }
        }
    }
}

// src/Libraries/LibAllowList.sol

/// @custom:version 1.0.0

/// @title Lib Allow List
/// @author LI.FI (https://li.fi)
/// @notice Library for managing and accessing the conract address allow list
library LibAllowList {
    /// Storage ///
    bytes32 internal constant NAMESPACE =
        keccak256("com.lifi.library.allow.list");

    struct AllowListStorage {
        mapping(address => bool) allowlist;
        mapping(bytes4 => bool) selectorAllowList;
        address[] contracts;
    }

    /// @dev Adds a contract address to the allow list
    /// @param _contract the contract address to add
    function addAllowedContract(address _contract) internal {
        _checkAddress(_contract);

        AllowListStorage storage als = _getStorage();

        if (als.allowlist[_contract]) return;

        als.allowlist[_contract] = true;
        als.contracts.push(_contract);
    }

    /// @dev Checks whether a contract address has been added to the allow list
    /// @param _contract the contract address to check
    function contractIsAllowed(
        address _contract
    ) internal view returns (bool) {
        return _getStorage().allowlist[_contract];
    }

    /// @dev Remove a contract address from the allow list
    /// @param _contract the contract address to remove
    function removeAllowedContract(address _contract) internal {
        AllowListStorage storage als = _getStorage();

        if (!als.allowlist[_contract]) {
            return;
        }

        als.allowlist[_contract] = false;

        uint256 length = als.contracts.length;
        // Find the contract in the list
        for (uint256 i = 0; i < length; i++) {
            if (als.contracts[i] == _contract) {
                // Move the last element into the place to delete
                als.contracts[i] = als.contracts[length - 1];
                // Remove the last element
                als.contracts.pop();
                break;
            }
        }
    }

    /// @dev Fetch contract addresses from the allow list
    function getAllowedContracts() internal view returns (address[] memory) {
        return _getStorage().contracts;
    }

    /// @dev Add a selector to the allow list
    /// @param _selector the selector to add
    function addAllowedSelector(bytes4 _selector) internal {
        _getStorage().selectorAllowList[_selector] = true;
    }

    /// @dev Removes a selector from the allow list
    /// @param _selector the selector to remove
    function removeAllowedSelector(bytes4 _selector) internal {
        _getStorage().selectorAllowList[_selector] = false;
    }

    /// @dev Returns if selector has been added to the allow list
    /// @param _selector the selector to check
    function selectorIsAllowed(bytes4 _selector) internal view returns (bool) {
        return _getStorage().selectorAllowList[_selector];
    }

    /// @dev Fetch local storage struct
    function _getStorage()
        internal
        pure
        returns (AllowListStorage storage als)
    {
        bytes32 position = NAMESPACE;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            als.slot := position
        }
    }

    /// @dev Contains business logic for validating a contract address.
    /// @param _contract address of the dex to check
    function _checkAddress(address _contract) private view {
        if (_contract == address(0)) revert InvalidContract();

        if (_contract.code.length == 0) revert InvalidContract();
    }
}

// src/Libraries/LibUtil.sol

/// @custom:version 1.0.0

library LibUtil {
    using LibBytes for bytes;

    function getRevertMsg(
        bytes memory _res
    ) internal pure returns (string memory) {
        // If the _res length is less than 68, then the transaction failed silently (without a revert message)
        if (_res.length < 68) return "Transaction reverted silently";
        bytes memory revertData = _res.slice(4, _res.length - 4); // Remove the selector which is the first 4 bytes
        return abi.decode(revertData, (string)); // All that remains is the revert string
    }

    /// @notice Determines whether the given address is the zero address
    /// @param addr The address to verify
    /// @return Boolean indicating if the address is the zero address
    function isZeroAddress(address addr) internal pure returns (bool) {
        return addr == address(0);
    }

    function revertWith(bytes memory data) internal pure {
        assembly {
            let dataSize := mload(data) // Load the size of the data
            let dataPtr := add(data, 0x20) // Advance data pointer to the next word
            revert(dataPtr, dataSize) // Revert with the given data
        }
    }
}

// lib/solmate/src/utils/SafeTransferLib.sol

/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeTransferLib.sol)
/// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer.
/// @dev Note that none of the functions in this library check that a token has code at all! That responsibility is delegated to the caller.
library SafeTransferLib_1 {
    /*//////////////////////////////////////////////////////////////
                             ETH OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferETH(address to, uint256 amount) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Transfer the ETH and store if it succeeded or not.
            success := call(gas(), to, amount, 0, 0, 0, 0)
        }

        require(success, "ETH_TRANSFER_FAILED");
    }

    /*//////////////////////////////////////////////////////////////
                            ERC20 OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferFrom(
        ERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), from) // Append the "from" argument.
            mstore(add(freeMemoryPointer, 36), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 68), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 100 because the length of our calldata totals up like so: 4 + 32 * 3.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 100, 0, 32)
            )
        }

        require(success, "TRANSFER_FROM_FAILED");
    }

    function safeTransfer(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "TRANSFER_FAILED");
    }

    function safeApprove(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        /// @solidity memory-safe-assembly
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "APPROVE_FAILED");
    }
}

// src/Libraries/LibAsset.sol

/// @title LibAsset
/// @custom:version 2.0.0
/// @notice This library contains helpers for dealing with onchain transfers
///         of assets, including accounting for the native asset `assetId`
///         conventions and any noncompliant ERC20 transfers
library LibAsset {
    using SafeTransferLib_0 for address;
    using SafeTransferLib_0 for address payable;

    address internal constant NULL_ADDRESS = address(0);

    address internal constant NON_EVM_ADDRESS =
        0x11f111f111f111F111f111f111F111f111f111F1;

    /// @dev All native assets use the empty address for their asset id
    ///      by convention

    address internal constant NATIVE_ASSETID = NULL_ADDRESS;

    /// @dev EIP-7702 delegation designator prefix for Account Abstraction
    bytes3 internal constant DELEGATION_DESIGNATOR = 0xef0100;

    /// @notice Gets the balance of the inheriting contract for the given asset
    /// @param assetId The asset identifier to get the balance of
    /// @return Balance held by contracts using this library (returns 0 if assetId does not exist)
    function getOwnBalance(address assetId) internal view returns (uint256) {
        return
            isNativeAsset(assetId)
                ? address(this).balance
                : assetId.balanceOf(address(this));
    }

    /// @notice Wrapper function to transfer a given asset (native or erc20) to
    ///         some recipient. Should handle all non-compliant return value
    ///         tokens as well by using the SafeERC20 contract by open zeppelin.
    /// @param assetId Asset id for transfer (address(0) for native asset,
    ///                token address for erc20s)
    /// @param recipient Address to send asset to
    /// @param amount Amount to send to given recipient
    function transferAsset(
        address assetId,
        address payable recipient,
        uint256 amount
    ) internal {
        if (isNativeAsset(assetId)) {
            transferNativeAsset(recipient, amount);
        } else {
            transferERC20(assetId, recipient, amount);
        }
    }

    /// @notice Transfers ether from the inheriting contract to a given
    ///         recipient
    /// @param recipient Address to send ether to
    /// @param amount Amount to send to given recipient
    function transferNativeAsset(
        address payable recipient,
        uint256 amount
    ) private {
        // make sure a meaningful receiver address was provided
        if (recipient == NULL_ADDRESS) revert InvalidReceiver();

        // transfer native asset (will revert if target reverts or contract has insufficient balance)
        recipient.safeTransferETH(amount);
    }

    /// @notice Transfers tokens from the inheriting contract to a given recipient
    /// @param assetId Token address to transfer
    /// @param recipient Address to send tokens to
    /// @param amount Amount to send to given recipient
    function transferERC20(
        address assetId,
        address recipient,
        uint256 amount
    ) private {
        // make sure a meaningful receiver address was provided
        if (recipient == NULL_ADDRESS) {
            revert InvalidReceiver();
        }

        // transfer ERC20 assets (will revert if target reverts or contract has insufficient balance)
        assetId.safeTransfer(recipient, amount);
    }

    /// @notice Transfers tokens from a sender to a given recipient
    /// @param assetId Token address to transfer
    /// @param from Address of sender/owner
    /// @param recipient Address of recipient/spender
    /// @param amount Amount to transfer from owner to spender
    function transferFromERC20(
        address assetId,
        address from,
        address recipient,
        uint256 amount
    ) internal {
        // check if native asset
        if (isNativeAsset(assetId)) {
            revert NullAddrIsNotAnERC20Token();
        }

        // make sure a meaningful receiver address was provided
        if (recipient == NULL_ADDRESS) {
            revert InvalidReceiver();
        }

        // transfer ERC20 assets (will revert if target reverts or contract has insufficient balance)
        assetId.safeTransferFrom(from, recipient, amount);
    }

    /// @notice Pulls tokens from msg.sender
    /// @param assetId Token address to transfer
    /// @param amount Amount to transfer from owner
    function depositAsset(address assetId, uint256 amount) internal {
        // make sure a meaningful amount was provided
        if (amount == 0) revert InvalidAmount();

        // check if native asset
        if (isNativeAsset(assetId)) {
            // ensure msg.value is equal or greater than amount
            if (msg.value < amount) revert InvalidAmount();
        } else {
            // transfer ERC20 assets (will revert if target reverts or contract has insufficient balance)
            assetId.safeTransferFrom(msg.sender, address(this), amount);
        }
    }

    function depositAssets(LibSwap.SwapData[] calldata swaps) internal {
        for (uint256 i = 0; i < swaps.length; ) {
            LibSwap.SwapData calldata swap = swaps[i];
            if (swap.requiresDeposit) {
                depositAsset(swap.sendingAssetId, swap.fromAmount);
            }
            unchecked {
                i++;
            }
        }
    }

    /// @notice If the current allowance is insufficient, the allowance for a given spender
    ///         is set to MAX_UINT.
    /// @param assetId Token address to transfer
    /// @param spender Address to give spend approval to
    /// @param amount allowance amount required for current transaction
    function maxApproveERC20(
        IERC20 assetId,
        address spender,
        uint256 amount
    ) internal {
        approveERC20(assetId, spender, amount, type(uint256).max);
    }

    /// @notice If the current allowance is insufficient, the allowance for a given spender
    ///         is set to the amount provided
    /// @param assetId Token address to transfer
    /// @param spender Address to give spend approval to
    /// @param requiredAllowance Allowance required for current transaction
    /// @param setAllowanceTo The amount the allowance should be set to if current allowance is insufficient
    function approveERC20(
        IERC20 assetId,
        address spender,
        uint256 requiredAllowance,
        uint256 setAllowanceTo
    ) internal {
        if (isNativeAsset(address(assetId))) {
            return;
        }

        // make sure a meaningful spender address was provided
        if (spender == NULL_ADDRESS) {
            revert NullAddrIsNotAValidSpender();
        }

        // check if allowance is sufficient, otherwise set allowance to provided amount
        // If the initial attempt to approve fails, attempts to reset the approved amount to zero,
        // then retries the approval again (some tokens, e.g. USDT, requires this).
        // Reverts upon failure
        if (assetId.allowance(address(this), spender) < requiredAllowance) {
            address(assetId).safeApproveWithRetry(spender, setAllowanceTo);
        }
    }

    /// @notice Determines whether the given assetId is the native asset
    /// @param assetId The asset identifier to evaluate
    /// @return Boolean indicating if the asset is the native asset
    function isNativeAsset(address assetId) internal pure returns (bool) {
        return assetId == NATIVE_ASSETID;
    }

    /// @notice Checks if the given address is a contract (including EIP‑7702 AA‑wallets)
    ///         Returns true for any account with runtime code or with the 0xef0100 prefix (EIP‑7702).
    ///         Limitations:
    ///         - Still returns false during construction phase of a contract
    ///         - Cannot distinguish between EOA and self-destructed contract
    /// @param account The address to be checked
    function isContract(address account) internal view returns (bool) {
        bytes memory code = new bytes(23); // 3 bytes prefix + 20 bytes address

        assembly {
            extcodecopy(account, add(code, 0x20), 0, 23)
        }

        // Check for delegation designator prefix
        bytes3 prefix;
        assembly {
            prefix := mload(add(code, 32))
        }

        if (prefix == DELEGATION_DESIGNATOR) {
            // Extract delegate address (next 20 bytes)
            address delegateAddr;
            assembly {
                delegateAddr := mload(add(add(code, 0x20), 3))
                delegateAddr := shr(96, delegateAddr)
            }

            // Only check first level of delegation
            uint256 delegateSize;
            assembly {
                delegateSize := extcodesize(delegateAddr)
            }
            return delegateSize > 0;
        }

        // If not delegated, check if it's a regular contract
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
}

// src/Libraries/LibSwap.sol

/// @title LibSwap
/// @custom:version 1.1.0
/// @notice This library contains functionality to execute mostly swaps but also
///         other calls such as fee collection, token wrapping/unwrapping or
///         sending gas to destination chain
library LibSwap {
    /// @notice Struct containing all necessary data to execute a swap or generic call
    /// @param callTo The address of the contract to call for executing the swap
    /// @param approveTo The address that will receive token approval (can be different than callTo for some DEXs)
    /// @param sendingAssetId The address of the token being sent
    /// @param receivingAssetId The address of the token expected to be received
    /// @param fromAmount The exact amount of the sending asset to be used in the call
    /// @param callData Encoded function call data to be sent to the `callTo` contract
    /// @param requiresDeposit A flag indicating whether the tokens must be deposited (pulled) before the call
    struct SwapData {
        address callTo;
        address approveTo;
        address sendingAssetId;
        address receivingAssetId;
        uint256 fromAmount;
        bytes callData;
        bool requiresDeposit;
    }

    /// @notice Emitted after a successful asset swap or related operation
    /// @param transactionId    The unique identifier associated with the swap operation
    /// @param dex              The address of the DEX or contract that handled the swap
    /// @param fromAssetId      The address of the token that was sent
    /// @param toAssetId        The address of the token that was received
    /// @param fromAmount       The amount of `fromAssetId` sent
    /// @param toAmount         The amount of `toAssetId` received
    /// @param timestamp        The timestamp when the swap was executed
    event AssetSwapped(
        bytes32 transactionId,
        address dex,
        address fromAssetId,
        address toAssetId,
        uint256 fromAmount,
        uint256 toAmount,
        uint256 timestamp
    );

    function swap(bytes32 transactionId, SwapData calldata _swap) internal {
        // make sure callTo is a contract
        if (!LibAsset.isContract(_swap.callTo)) revert InvalidContract();

        // make sure that fromAmount is not 0
        uint256 fromAmount = _swap.fromAmount;
        if (fromAmount == 0) revert NoSwapFromZeroBalance();

        // determine how much native value to send with the swap call
        uint256 nativeValue = LibAsset.isNativeAsset(_swap.sendingAssetId)
            ? _swap.fromAmount
            : 0;

        // store initial balance (required for event emission)
        uint256 initialReceivingAssetBalance = LibAsset.getOwnBalance(
            _swap.receivingAssetId
        );

        // max approve (if ERC20)
        if (nativeValue == 0) {
            LibAsset.maxApproveERC20(
                IERC20(_swap.sendingAssetId),
                _swap.approveTo,
                _swap.fromAmount
            );
        }

        // we used to have a sending asset balance check here (initialSendingAssetBalance >= _swap.fromAmount)
        // this check was removed to allow for more flexibility with rebasing/fee-taking tokens
        // the general assumption is that if not enough tokens are available to execute the calldata, the transaction will fail anyway
        // the error message might not be as explicit though

        // execute the swap
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory res) = _swap.callTo.call{
            value: nativeValue
        }(_swap.callData);
        if (!success) {
            LibUtil.revertWith(res);
        }

        // get post-swap balance
        uint256 newBalance = LibAsset.getOwnBalance(_swap.receivingAssetId);

        // emit event
        emit AssetSwapped(
            transactionId,
            _swap.callTo,
            _swap.sendingAssetId,
            _swap.receivingAssetId,
            _swap.fromAmount,
            newBalance > initialReceivingAssetBalance
                ? newBalance - initialReceivingAssetBalance
                : newBalance,
            block.timestamp
        );
    }
}

// src/Facets/GenericSwapFacetV3.sol

/// @title GenericSwapFacetV3
/// @author LI.FI (https://li.fi)
/// @notice Provides gas-optimized functionality for fee collection and for swapping through any APPROVED DEX
/// @dev Can only execute calldata for APPROVED function selectors
/// @custom:version 1.0.2
contract GenericSwapFacetV3 is ILiFi {
    using SafeTransferLib_1 for ERC20;

    /// Storage
    address public immutable NATIVE_ADDRESS;

    /// Constructor
    /// @param _nativeAddress the address of the native token for this network
    constructor(address _nativeAddress) {
        NATIVE_ADDRESS = _nativeAddress;
    }

    /// External Methods ///

    // SINGLE SWAPS

    /// @notice Performs a single swap from an ERC20 token to another ERC20 token
    /// @param _transactionId the transaction id associated with the operation
    /// @param _integrator the name of the integrator
    /// @param _referrer the address of the referrer
    /// @param _receiver the address to receive the swapped tokens into (also excess tokens)
    /// @param _minAmountOut the minimum amount of the final asset to receive
    /// @param _swapData an object containing swap related data to perform swaps before bridging
    function swapTokensSingleV3ERC20ToERC20(
        bytes32 _transactionId,
        string calldata _integrator,
        string calldata _referrer,
        address payable _receiver,
        uint256 _minAmountOut,
        LibSwap.SwapData calldata _swapData
    ) external {
        _depositAndSwapERC20Single(_swapData, _receiver);

        address receivingAssetId = _swapData.receivingAssetId;
        address sendingAssetId = _swapData.sendingAssetId;

        // get contract's balance (which will be sent in full to user)
        uint256 amountReceived = ERC20(receivingAssetId).balanceOf(
            address(this)
        );

        // ensure that minAmountOut was received
        if (amountReceived < _minAmountOut)
            revert CumulativeSlippageTooHigh(_minAmountOut, amountReceived);

        // transfer funds to receiver
        ERC20(receivingAssetId).safeTransfer(_receiver, amountReceived);

        // emit events (both required for tracking)
        uint256 fromAmount = _swapData.fromAmount;
        emit LibSwap.AssetSwapped(
            _transactionId,
            _swapData.callTo,
            sendingAssetId,
            receivingAssetId,
            fromAmount,
            amountReceived,
            block.timestamp
        );

        emit ILiFi.LiFiGenericSwapCompleted(
            _transactionId,
            _integrator,
            _referrer,
            _receiver,
            sendingAssetId,
            receivingAssetId,
            fromAmount,
            amountReceived
        );
    }

    /// @notice Performs a single swap from an ERC20 token to the network's native token
    /// @param _transactionId the transaction id associated with the operation
    /// @param _integrator the name of the integrator
    /// @param _referrer the address of the referrer
    /// @param _receiver the address to receive the swapped tokens into (also excess tokens)
    /// @param _minAmountOut the minimum amount of the final asset to receive
    /// @param _swapData an object containing swap related data to perform swaps before bridging
    function swapTokensSingleV3ERC20ToNative(
        bytes32 _transactionId,
        string calldata _integrator,
        string calldata _referrer,
        address payable _receiver,
        uint256 _minAmountOut,
        LibSwap.SwapData calldata _swapData
    ) external {
        _depositAndSwapERC20Single(_swapData, _receiver);

        // get contract's balance (which will be sent in full to user)
        uint256 amountReceived = address(this).balance;

        // ensure that minAmountOut was received
        if (amountReceived < _minAmountOut)
            revert CumulativeSlippageTooHigh(_minAmountOut, amountReceived);

        // transfer funds to receiver
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, ) = _receiver.call{ value: amountReceived }("");
        if (!success) revert NativeAssetTransferFailed();

        // emit events (both required for tracking)
        address sendingAssetId = _swapData.sendingAssetId;
        uint256 fromAmount = _swapData.fromAmount;
        emit LibSwap.AssetSwapped(
            _transactionId,
            _swapData.callTo,
            sendingAssetId,
            NATIVE_ADDRESS,
            fromAmount,
            amountReceived,
            block.timestamp
        );

        emit ILiFi.LiFiGenericSwapCompleted(
            _transactionId,
            _integrator,
            _referrer,
            _receiver,
            sendingAssetId,
            NATIVE_ADDRESS,
            fromAmount,
            amountReceived
        );
    }

    /// @notice Performs a single swap from the network's native token to ERC20 token
    /// @param _transactionId the transaction id associated with the operation
    /// @param _integrator the name of the integrator
    /// @param _referrer the address of the referrer
    /// @param _receiver the address to receive the swapped tokens into (also excess tokens)
    /// @param _minAmountOut the minimum amount of the final asset to receive
    /// @param _swapData an object containing swap related data to perform swaps before bridging
    function swapTokensSingleV3NativeToERC20(
        bytes32 _transactionId,
        string calldata _integrator,
        string calldata _referrer,
        address payable _receiver,
        uint256 _minAmountOut,
        LibSwap.SwapData calldata _swapData
    ) external payable {
        address callTo = _swapData.callTo;
        // ensure that contract (callTo) and function selector are whitelisted
        if (
            !(LibAllowList.contractIsAllowed(callTo) &&
                LibAllowList.selectorIsAllowed(bytes4(_swapData.callData[:4])))
        ) revert ContractCallNotAllowed();

        // execute swap
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory res) = callTo.call{ value: msg.value }(
            _swapData.callData
        );
        if (!success) {
            LibUtil.revertWith(res);
        }

        _returnPositiveSlippageNative(_receiver);

        // get contract's balance (which will be sent in full to user)
        address receivingAssetId = _swapData.receivingAssetId;
        uint256 amountReceived = ERC20(receivingAssetId).balanceOf(
            address(this)
        );

        // ensure that minAmountOut was received
        if (amountReceived < _minAmountOut)
            revert CumulativeSlippageTooHigh(_minAmountOut, amountReceived);

        // transfer funds to receiver
        ERC20(receivingAssetId).safeTransfer(_receiver, amountReceived);

        // emit events (both required for tracking)
        uint256 fromAmount = _swapData.fromAmount;
        emit LibSwap.AssetSwapped(
            _transactionId,
            callTo,
            NATIVE_ADDRESS,
            receivingAssetId,
            fromAmount,
            amountReceived,
            block.timestamp
        );

        emit ILiFi.LiFiGenericSwapCompleted(
            _transactionId,
            _integrator,
            _referrer,
            _receiver,
            NATIVE_ADDRESS,
            receivingAssetId,
            fromAmount,
            amountReceived
        );
    }

    // MULTIPLE SWAPS

    /// @notice Performs multiple swaps in one transaction, starting with ERC20 and ending with native
    /// @param _transactionId the transaction id associated with the operation
    /// @param _integrator the name of the integrator
    /// @param _referrer the address of the referrer
    /// @param _receiver the address to receive the swapped tokens into (also excess tokens)
    /// @param _minAmountOut the minimum amount of the final asset to receive
    /// @param _swapData an object containing swap related data to perform swaps before bridging
    function swapTokensMultipleV3ERC20ToNative(
        bytes32 _transactionId,
        string calldata _integrator,
        string calldata _referrer,
        address payable _receiver,
        uint256 _minAmountOut,
        LibSwap.SwapData[] calldata _swapData
    ) external {
        _depositMultipleERC20Tokens(_swapData);
        _executeSwaps(_swapData, _transactionId, _receiver);
        _transferNativeTokensAndEmitEvent(
            _transactionId,
            _integrator,
            _referrer,
            _receiver,
            _minAmountOut,
            _swapData
        );
    }

    /// @notice Performs multiple swaps in one transaction, starting with ERC20 and ending with ERC20
    /// @param _transactionId the transaction id associated with the operation
    /// @param _integrator the name of the integrator
    /// @param _referrer the address of the referrer
    /// @param _receiver the address to receive the swapped tokens into (also excess tokens)
    /// @param _minAmountOut the minimum amount of the final asset to receive
    /// @param _swapData an object containing swap related data to perform swaps before bridging
    function swapTokensMultipleV3ERC20ToERC20(
        bytes32 _transactionId,
        string calldata _integrator,
        string calldata _referrer,
        address payable _receiver,
        uint256 _minAmountOut,
        LibSwap.SwapData[] calldata _swapData
    ) external {
        _depositMultipleERC20Tokens(_swapData);
        _executeSwaps(_swapData, _transactionId, _receiver);
        _transferERC20TokensAndEmitEvent(
            _transactionId,
            _integrator,
            _referrer,
            _receiver,
            _minAmountOut,
            _swapData
        );
    }

    /// @notice Performs multiple swaps in one transaction, starting with native and ending with ERC20
    /// @param _transactionId the transaction id associated with the operation
    /// @param _integrator the name of the integrator
    /// @param _referrer the address of the referrer
    /// @param _receiver the address to receive the swapped tokens into (also excess tokens)
    /// @param _minAmountOut the minimum amount of the final asset to receive
    /// @param _swapData an object containing swap related data to perform swaps before bridging
    function swapTokensMultipleV3NativeToERC20(
        bytes32 _transactionId,
        string calldata _integrator,
        string calldata _referrer,
        address payable _receiver,
        uint256 _minAmountOut,
        LibSwap.SwapData[] calldata _swapData
    ) external payable {
        _executeSwaps(_swapData, _transactionId, _receiver);
        _transferERC20TokensAndEmitEvent(
            _transactionId,
            _integrator,
            _referrer,
            _receiver,
            _minAmountOut,
            _swapData
        );
    }

    /// Private helper methods ///
    function _depositMultipleERC20Tokens(
        LibSwap.SwapData[] calldata _swapData
    ) private {
        // initialize variables before loop to save gas
        uint256 numOfSwaps = _swapData.length;
        LibSwap.SwapData calldata currentSwap;

        // go through all swaps and deposit tokens, where required
        for (uint256 i = 0; i < numOfSwaps; ) {
            currentSwap = _swapData[i];
            if (currentSwap.requiresDeposit) {
                // we will not check msg.value as tx will fail anyway if not enough value available
                // thus we only deposit ERC20 tokens here
                ERC20(currentSwap.sendingAssetId).safeTransferFrom(
                    msg.sender,
                    address(this),
                    currentSwap.fromAmount
                );
            }
            unchecked {
                ++i;
            }
        }
    }

    function _depositAndSwapERC20Single(
        LibSwap.SwapData calldata _swapData,
        address _receiver
    ) private {
        ERC20 sendingAsset = ERC20(_swapData.sendingAssetId);
        uint256 fromAmount = _swapData.fromAmount;
        // deposit funds
        sendingAsset.safeTransferFrom(msg.sender, address(this), fromAmount);

        // ensure that contract (callTo) and function selector are whitelisted
        address callTo = _swapData.callTo;
        address approveTo = _swapData.approveTo;
        bytes calldata callData = _swapData.callData;
        if (
            !(LibAllowList.contractIsAllowed(callTo) &&
                LibAllowList.selectorIsAllowed(bytes4(callData[:4])))
        ) revert ContractCallNotAllowed();

        // ensure that approveTo address is also whitelisted if it differs from callTo
        if (approveTo != callTo && !LibAllowList.contractIsAllowed(approveTo))
            revert ContractCallNotAllowed();

        // check if the current allowance is sufficient
        uint256 currentAllowance = sendingAsset.allowance(
            address(this),
            approveTo
        );

        // check if existing allowance is sufficient
        if (currentAllowance < fromAmount) {
            // check if is non-zero, set to 0 if not
            if (currentAllowance != 0) sendingAsset.safeApprove(approveTo, 0);
            // set allowance to uint max to avoid future approvals
            sendingAsset.safeApprove(approveTo, type(uint256).max);
        }

        // execute swap
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory res) = callTo.call(callData);
        if (!success) {
            LibUtil.revertWith(res);
        }

        _returnPositiveSlippageERC20(sendingAsset, _receiver);
    }

    // @dev: this function will not work with swapData that has multiple swaps with the same sendingAssetId
    //       as the _returnPositiveSlippage... functionality will refund all remaining tokens after the first swap
    //       We accept this fact since the use case is not common yet. As an alternative you can always use the
    //       "swapTokensGeneric" function of the original GenericSwapFacet
    function _executeSwaps(
        LibSwap.SwapData[] calldata _swapData,
        bytes32 _transactionId,
        address _receiver
    ) private {
        // initialize variables before loop to save gas
        uint256 numOfSwaps = _swapData.length;
        ERC20 sendingAsset;
        address sendingAssetId;
        address receivingAssetId;
        LibSwap.SwapData calldata currentSwap;
        bool success;
        bytes memory returnData;
        uint256 currentAllowance;

        // go through all swaps
        for (uint256 i = 0; i < numOfSwaps; ) {
            currentSwap = _swapData[i];
            sendingAssetId = currentSwap.sendingAssetId;
            sendingAsset = ERC20(currentSwap.sendingAssetId);
            receivingAssetId = currentSwap.receivingAssetId;

            // check if callTo address is whitelisted
            if (
                !LibAllowList.contractIsAllowed(currentSwap.callTo) ||
                !LibAllowList.selectorIsAllowed(
                    bytes4(currentSwap.callData[:4])
                )
            ) {
                revert ContractCallNotAllowed();
            }

            // if approveTo address is different to callTo, check if it's whitelisted, too
            if (
                currentSwap.approveTo != currentSwap.callTo &&
                !LibAllowList.contractIsAllowed(currentSwap.approveTo)
            ) {
                revert ContractCallNotAllowed();
            }

            if (LibAsset.isNativeAsset(sendingAssetId)) {
                // Native
                // execute the swap
                (success, returnData) = currentSwap.callTo.call{
                    value: currentSwap.fromAmount
                }(currentSwap.callData);
                if (!success) {
                    LibUtil.revertWith(returnData);
                }

                // return any potential leftover sendingAsset tokens
                // but only for swaps, not for fee collections (otherwise the whole amount would be returned before the actual swap)
                if (sendingAssetId != receivingAssetId)
                    _returnPositiveSlippageNative(_receiver);
            } else {
                // ERC20
                // check if the current allowance is sufficient
                currentAllowance = sendingAsset.allowance(
                    address(this),
                    currentSwap.approveTo
                );
                if (currentAllowance < currentSwap.fromAmount) {
                    sendingAsset.safeApprove(currentSwap.approveTo, 0);
                    sendingAsset.safeApprove(
                        currentSwap.approveTo,
                        type(uint256).max
                    );
                }

                // execute the swap
                (success, returnData) = currentSwap.callTo.call(
                    currentSwap.callData
                );
                if (!success) {
                    LibUtil.revertWith(returnData);
                }

                // return any potential leftover sendingAsset tokens
                // but only for swaps, not for fee collections (otherwise the whole amount would be returned before the actual swap)
                if (sendingAssetId != receivingAssetId)
                    _returnPositiveSlippageERC20(sendingAsset, _receiver);
            }

            // emit AssetSwapped event
            // @dev: this event might in some cases emit inaccurate information. e.g. if a token is swapped and this contract already held a balance of the receivingAsset
            //       then the event will show swapOutputAmount + existingBalance as toAmount. We accept this potential inaccuracy in return for gas savings and may update this
            //       at a later stage when the described use case becomes more common
            emit LibSwap.AssetSwapped(
                _transactionId,
                currentSwap.callTo,
                sendingAssetId,
                receivingAssetId,
                currentSwap.fromAmount,
                LibAsset.isNativeAsset(receivingAssetId)
                    ? address(this).balance
                    : ERC20(receivingAssetId).balanceOf(address(this)),
                block.timestamp
            );

            unchecked {
                ++i;
            }
        }
    }

    function _transferERC20TokensAndEmitEvent(
        bytes32 _transactionId,
        string calldata _integrator,
        string calldata _referrer,
        address payable _receiver,
        uint256 _minAmountOut,
        LibSwap.SwapData[] calldata _swapData
    ) private {
        // determine the end result of the swap
        address finalAssetId = _swapData[_swapData.length - 1]
            .receivingAssetId;
        uint256 amountReceived = ERC20(finalAssetId).balanceOf(address(this));

        // make sure minAmountOut was received
        if (amountReceived < _minAmountOut)
            revert CumulativeSlippageTooHigh(_minAmountOut, amountReceived);

        // transfer to receiver
        ERC20(finalAssetId).safeTransfer(_receiver, amountReceived);

        // emit event
        emit ILiFi.LiFiGenericSwapCompleted(
            _transactionId,
            _integrator,
            _referrer,
            _receiver,
            _swapData[0].sendingAssetId,
            finalAssetId,
            _swapData[0].fromAmount,
            amountReceived
        );
    }

    function _transferNativeTokensAndEmitEvent(
        bytes32 _transactionId,
        string calldata _integrator,
        string calldata _referrer,
        address payable _receiver,
        uint256 _minAmountOut,
        LibSwap.SwapData[] calldata _swapData
    ) private {
        uint256 amountReceived = address(this).balance;

        // make sure minAmountOut was received
        if (amountReceived < _minAmountOut)
            revert CumulativeSlippageTooHigh(_minAmountOut, amountReceived);

        // transfer funds to receiver
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, ) = _receiver.call{ value: amountReceived }("");
        if (!success) {
            revert NativeAssetTransferFailed();
        }

        // emit event
        emit ILiFi.LiFiGenericSwapCompleted(
            _transactionId,
            _integrator,
            _referrer,
            _receiver,
            _swapData[0].sendingAssetId,
            NATIVE_ADDRESS,
            _swapData[0].fromAmount,
            amountReceived
        );
    }

    // returns any unused 'sendingAsset' tokens (=> positive slippage) to the receiver address
    function _returnPositiveSlippageERC20(
        ERC20 sendingAsset,
        address receiver
    ) private {
        // if a balance exists in sendingAsset, it must be positive slippage
        if (address(sendingAsset) != NATIVE_ADDRESS) {
            uint256 sendingAssetBalance = sendingAsset.balanceOf(
                address(this)
            );

            // we decided to change this value from 0 to 1 to have more flexibility with rebasing tokens that
            // sometimes produce rounding errors. In those cases there might be 1 wei leftover at the end of a swap
            // but this 1 wei is not transferable, so the tx reverts. We accept that 1 wei dust gets stuck in the contract
            // with every tx as this does not represent a significant USD value in any relevant token.
            if (sendingAssetBalance > 1) {
                sendingAsset.safeTransfer(receiver, sendingAssetBalance);
            }
        }
    }

    // returns any unused native tokens (=> positive slippage) to the receiver address
    function _returnPositiveSlippageNative(address receiver) private {
        // if a native balance exists in sendingAsset, it must be positive slippage
        uint256 nativeBalance = address(this).balance;

        if (nativeBalance > 0) {
            // solhint-disable-next-line avoid-low-level-calls
            (bool success, ) = receiver.call{ value: nativeBalance }("");
            if (!success) revert NativeAssetTransferFailed();
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);
    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);
    /**
     * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from,
        address to,
        uint256 amount
    ) external returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.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 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'
        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) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }
    /**
     * @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
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.
        return account.code.length > 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");
        (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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }
    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }
    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}
// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.24;
import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
contract RedSnwapper {
  using SafeERC20 for IERC20;
  using Utils for IERC20;
  SafeExecutor public immutable safeExecutor;
  constructor() {
    safeExecutor = new SafeExecutor();
  }
  // @notice Swaps tokens
  // @notice 1. Transfers amountIn of tokens tokenIn to executor
  // @notice 2. launches executor with executorData and value = msg.value
  // @notice 3. Checks that recipient's tokenOut balance was increased at least amountOutMin
  function snwap(
    IERC20 tokenIn,
    uint amountIn, // if amountIn == 0 then amountIn = tokenIn.balance(this) - 1
    address recipient,
    IERC20 tokenOut,
    uint amountOutMin,
    address executor,
    bytes calldata executorData
  ) external payable returns (uint amountOut) {
    uint initialOutputBalance = tokenOut.universalBalanceOf(recipient);
    if (address(tokenIn) != NATIVE_ADDRESS) {
      if (amountIn > 0) tokenIn.safeTransferFrom(msg.sender, executor, amountIn);
      else tokenIn.safeTransfer(executor, tokenIn.balanceOf(address(this)) - 1); // -1 is slot undrain protection
    }
    safeExecutor.execute{value: msg.value}(executor, executorData);
    amountOut = tokenOut.universalBalanceOf(recipient) - initialOutputBalance;
    if (amountOut < amountOutMin)
      revert MinimalOutputBalanceViolation(address(tokenOut), amountOut);
  }
  // @notice Swaps multiple tokens
  // @notice 1. Transfers inputTokens to inputTokens[i].transferTo
  // @notice 2. launches executors
  // @notice 3. Checks that recipient's tokenOut balance was increased at least amountOutMin
  function snwapMultiple(
    InputToken[] calldata inputTokens,
    OutputToken[] calldata outputTokens,
    Executor[] calldata executors
  ) external payable returns (uint[] memory amountOut) {
    uint[] memory initialOutputBalance = new uint[](outputTokens.length);
    for (uint i = 0; i < outputTokens.length; i++) {
      initialOutputBalance[i] = outputTokens[i].token.universalBalanceOf(outputTokens[i].recipient);
    }
    for (uint i = 0; i < inputTokens.length; i++) {
      IERC20 tokenIn = inputTokens[i].token;
      if (address(tokenIn) != NATIVE_ADDRESS) {
        if (inputTokens[i].amountIn > 0) 
          tokenIn.safeTransferFrom(msg.sender, inputTokens[i].transferTo, inputTokens[i].amountIn);
        else tokenIn.safeTransfer(inputTokens[i].transferTo, tokenIn.balanceOf(address(this)) - 1); // -1 is slot undrain protection
      }
    }
    safeExecutor.executeMultiple{value: msg.value}(executors);
    amountOut = new uint[](outputTokens.length);
    for (uint i = 0; i < outputTokens.length; i++) {
      amountOut[i] = outputTokens[i].token.universalBalanceOf(outputTokens[i].recipient) - initialOutputBalance[i];
      if (amountOut[i] < outputTokens[i].amountOutMin)
        revert MinimalOutputBalanceViolation(address(outputTokens[i].token), amountOut[i]);
    }
  }
}
// This contract doesn't have token approves, so can safely call other contracts
contract SafeExecutor {  
  using Utils for address;
  function execute(address executor, bytes calldata executorData) external payable {
    executor.callRevertBubbleUp(msg.value, executorData);
  }
  function executeMultiple(Executor[] calldata executors) external payable {
    for (uint i = 0; i < executors.length; i++) {
      executors[i].executor.callRevertBubbleUp(executors[i].value, executors[i].data);
    }
  }
}
error MinimalOutputBalanceViolation(address tokenOut, uint256 amountOut);
address constant NATIVE_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
struct InputToken {
  IERC20 token;
  uint amountIn;
  address transferTo;
}
struct OutputToken {
  IERC20 token;
  address recipient;
  uint amountOutMin;
}
struct Executor {
  address executor;
  uint value;
  bytes data;
}
library Utils {
  using SafeERC20 for IERC20;
  
  function universalBalanceOf(IERC20 token, address user) internal view returns (uint256) {
    if (address(token) == NATIVE_ADDRESS) return address(user).balance;
    else return token.balanceOf(user);
  }
  function callRevertBubbleUp(address contr, uint256 value, bytes memory data) internal {
    (bool success, bytes memory returnBytes) = contr.call{value: value}(data);
    if (!success) {
      assembly {
        revert(add(32, returnBytes), mload(returnBytes))
      }
    }
  }
}