// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts/utils/Address.sol
pragma solidity ^0.6.2;
/**
 * @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 in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }
    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// File: contracts/upgrade_proxy/Proxy.sol
pragma solidity ^0.6.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 * 
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 * 
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     * 
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }
    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal virtual view returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     * 
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback () payable external {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive () payable external {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     * 
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {
    }
}
// File: contracts/upgrade_proxy/UpgradeableProxy.sol
pragma solidity ^0.6.0;
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 * 
 * Upgradeability is only provided internally through {_upgradeTo}. For an externally upgradeable proxy see
 * {TransparentUpgradeableProxy}.
 */
contract UpgradeableProxy is Proxy {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     * 
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) public payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _setImplementation(_logic);
        if(_data.length > 0) {
            // solhint-disable-next-line avoid-low-level-calls
            (bool success,) = _logic.delegatecall(_data);
            require(success);
        }
    }
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal override view returns (address impl) {
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            impl := sload(slot)
        }
    }
    /**
     * @dev Upgrades the proxy to a new implementation.
     * 
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "UpgradeableProxy: new implementation is not a contract");
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newImplementation)
        }
    }
}
// File: contracts/upgrade_proxy/TransparentUpgradeableProxy.sol
pragma solidity ^0.6.0;
/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 * 
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 * 
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 * 
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 * 
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is UpgradeableProxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {UpgradeableProxy-constructor}.
     */
    constructor(address _logic, address _admin, bytes memory _data) public payable UpgradeableProxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _setAdmin(_admin);
    }
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _admin()) {
            _;
        } else {
            _fallback();
        }
    }
    /**
     * @dev Returns the current admin.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     * 
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address) {
        return _admin();
    }
    /**
     * @dev Returns the current implementation.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     * 
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address) {
        return _implementation();
    }
    /**
     * @dev Changes the admin of the proxy.
     * 
     * Emits an {AdminChanged} event.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external ifAdmin {
        require(newAdmin != address(0), "TransparentUpgradeableProxy: new admin is the zero address");
        emit AdminChanged(_admin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev Upgrade the implementation of the proxy.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeTo(newImplementation);
    }
    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeTo(newImplementation);
        // solhint-disable-next-line avoid-low-level-calls
        (bool success,) = newImplementation.delegatecall(data);
        require(success);
    }
    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view returns (address adm) {
        bytes32 slot = _ADMIN_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            adm := sload(slot)
        }
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        bytes32 slot = _ADMIN_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newAdmin)
        }
    }
    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal override virtual {
        require(msg.sender != _admin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}
// File: contracts/Tokenlon.sol
pragma solidity ^0.6.0;
contract Tokenlon is TransparentUpgradeableProxy {
    constructor(address _logic, address _admin, bytes memory _data) public payable TransparentUpgradeableProxy(_logic, _admin, _data) {}
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.5;
import "@openzeppelin/contracts/utils/Address.sol";
import "./interfaces/IAllowanceTarget.sol";
/**
 * @dev AllowanceTarget contract
 */
contract AllowanceTarget is IAllowanceTarget {
    using Address for address;
    uint256 constant private TIME_LOCK_DURATION = 1 days;
    address public spender;
    address public newSpender;
    uint256 public timelockExpirationTime;
    modifier onlySpender() {
        require(spender == msg.sender, "AllowanceTarget: not the spender");
        _;
    }
    constructor(address _spender) public {
        require(_spender != address(0), "AllowanceTarget: _spender should not be 0");
        // Set spender
        spender = _spender;
    }
    function setSpenderWithTimelock(address _newSpender) override external onlySpender {
        require(_newSpender.isContract(), "AllowanceTarget: new spender not a contract");
        require(newSpender == address(0) && timelockExpirationTime == 0, "AllowanceTarget: SetSpender in progress");
        timelockExpirationTime = now + TIME_LOCK_DURATION;
        newSpender = _newSpender;
    }
    function completeSetSpender() override external {
        require(timelockExpirationTime != 0, "AllowanceTarget: no pending SetSpender");
        require(now >= timelockExpirationTime, "AllowanceTarget: time lock not expired yet");
        // Set new spender
        spender = newSpender;
        // Reset
        timelockExpirationTime = 0;
        newSpender = address(0);
    }
    function teardown() override external onlySpender {
        selfdestruct(payable(spender));
    }
    /// @dev Execute an arbitrary call. Only an authority can call this.
    /// @param target The call target.
    /// @param callData The call data.
    /// @return resultData The data returned by the call.
    function executeCall(
        address payable target,
        bytes calldata callData
    )
        override
        external
        onlySpender
        returns (bytes memory resultData)
    {
        bool success;
        (success, resultData) = target.call(callData);
        if (!success) {
            // Get the error message returned
            assembly {
                let ptr := mload(0x40)
                let size := returndatasize()
                returndatacopy(ptr, 0, size)
                revert(ptr, size)
            }
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2 <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;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
pragma solidity ^0.6.0;
interface IAllowanceTarget {
    function setSpenderWithTimelock(address _newSpender) external;
    function completeSetSpender() external;
    function executeCall(address payable _target, bytes calldata _callData) external returns (bytes memory resultData);
    function teardown() external;
}// SPDX-License-Identifier: MIT
pragma solidity ^0.6.5;
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./interfaces/IAllowanceTarget.sol";
/**
 * @dev Spender contract
 */
contract Spender {
    using SafeMath for uint256;
    // Constants do not have storage slot.
    address private constant ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    address private constant ZERO_ADDRESS = address(0);
    uint256 constant private TIME_LOCK_DURATION = 1 days;
    // Below are the variables which consume storage slots.
    address public operator;
    address public pendingOperator;
    address public allowanceTarget;
    mapping(address => bool) private authorized;
    mapping(address => bool) private tokenBlacklist;
    uint256 public numPendingAuthorized;
    mapping(uint256 => address) public pendingAuthorized;
    uint256 public timelockExpirationTime;
    uint256 public contractDeployedTime;
    bool public timelockActivated;
    mapping(address => bool) public consumeGasERC20Tokens;
    // System events
    event TimeLockActivated(uint256 activatedTimeStamp);
    // Operator events
    event TransferOwnership(address newOperator);
    event SetAllowanceTarget(address allowanceTarget);
    event SetNewSpender(address newSpender);
    event SetConsumeGasERC20Token(address token);
    event TearDownAllowanceTarget(uint256 tearDownTimeStamp);
    event BlackListToken(address token, bool isBlacklisted);
    event AuthorizeSpender(address spender, bool isAuthorized);
    /************************************************************
    *          Access control and ownership management          *
    *************************************************************/
    modifier onlyOperator() {
        require(operator == msg.sender, "Spender: not the operator");
        _;
    }
    modifier onlyAuthorized() {
        require(authorized[msg.sender], "Spender: not authorized");
        _;
    }
    function setNewOperator(address _newOperator) external onlyOperator {
        require(_newOperator != address(0), "Spender: operator can not be zero address");
        pendingOperator = _newOperator;
    }
    function acceptAsOperator() external {
        require(pendingOperator == msg.sender, "Spender: only nominated one can accept as new operator");
        operator = pendingOperator;
        pendingOperator = address(0);
        emit TransferOwnership(pendingOperator);
    }
    /************************************************************
    *                    Timelock management                    *
    *************************************************************/
    /// @dev Everyone can activate timelock after the contract has been deployed for more than 1 day.
    function activateTimelock() external {
        bool canActivate = block.timestamp.sub(contractDeployedTime) > 1 days;
        require(canActivate && ! timelockActivated, "Spender: can not activate timelock yet or has been activated");
        timelockActivated = true;
        emit TimeLockActivated(block.timestamp);
    }
    /************************************************************
    *              Constructor and init functions               *
    *************************************************************/
    constructor(address _operator, address[] memory _consumeGasERC20Tokens) public {
        require(_operator != address(0), "Spender: _operator should not be 0");
        // Set operator
        operator = _operator;
        timelockActivated = false;
        contractDeployedTime = block.timestamp;
        for (uint256 i = 0; i < _consumeGasERC20Tokens.length; i++) {
            consumeGasERC20Tokens[_consumeGasERC20Tokens[i]] = true;
        }
    }
    function setAllowanceTarget(address _allowanceTarget) external onlyOperator {
        require(allowanceTarget == address(0), "Spender: can not reset allowance target");
        // Set allowanceTarget
        allowanceTarget = _allowanceTarget;
        emit SetAllowanceTarget(_allowanceTarget);
    }
    /************************************************************
    *          AllowanceTarget interaction functions            *
    *************************************************************/
    function setNewSpender(address _newSpender) external onlyOperator {
        IAllowanceTarget(allowanceTarget).setSpenderWithTimelock(_newSpender);
        emit SetNewSpender(_newSpender);
    }
    function teardownAllowanceTarget() external onlyOperator {
        IAllowanceTarget(allowanceTarget).teardown();
        emit TearDownAllowanceTarget(block.timestamp);
    }
    /************************************************************
    *           Whitelist and blacklist functions               *
    *************************************************************/
    function isBlacklisted(address _tokenAddr) external view returns (bool) {
        return tokenBlacklist[_tokenAddr];
    }
    function blacklist(address[] calldata _tokenAddrs, bool[] calldata _isBlacklisted) external onlyOperator {
        require(_tokenAddrs.length == _isBlacklisted.length, "Spender: length mismatch");
        for (uint256 i = 0; i < _tokenAddrs.length; i++) {
            tokenBlacklist[_tokenAddrs[i]] = _isBlacklisted[i];
            emit BlackListToken(_tokenAddrs[i], _isBlacklisted[i]);
        }
    }
    
    function isAuthorized(address _caller) external view returns (bool) {
        return authorized[_caller];
    }
    function authorize(address[] calldata _pendingAuthorized) external onlyOperator {
        require(_pendingAuthorized.length > 0, "Spender: authorize list is empty");
        require(numPendingAuthorized == 0 && timelockExpirationTime == 0, "Spender: an authorize current in progress");
        if (timelockActivated) {
            numPendingAuthorized = _pendingAuthorized.length;
            for (uint256 i = 0; i < _pendingAuthorized.length; i++) {
                require(_pendingAuthorized[i] != address(0), "Spender: can not authorize zero address");
                pendingAuthorized[i] = _pendingAuthorized[i];
            }
            timelockExpirationTime = now + TIME_LOCK_DURATION;
        } else {
            for (uint256 i = 0; i < _pendingAuthorized.length; i++) {
                require(_pendingAuthorized[i] != address(0), "Spender: can not authorize zero address");
                authorized[_pendingAuthorized[i]] = true;
                emit AuthorizeSpender(_pendingAuthorized[i], true);
            }
        }
    }
    function completeAuthorize() external {
        require(timelockExpirationTime != 0, "Spender: no pending authorize");
        require(now >= timelockExpirationTime, "Spender: time lock not expired yet");
        for (uint256 i = 0; i < numPendingAuthorized; i++) {
            authorized[pendingAuthorized[i]] = true;
            emit AuthorizeSpender(pendingAuthorized[i], true);
            delete pendingAuthorized[i];
        }
        timelockExpirationTime = 0;
        numPendingAuthorized = 0;
    }
    function deauthorize(address[] calldata _deauthorized) external onlyOperator {
        for (uint256 i = 0; i < _deauthorized.length; i++) {
            authorized[_deauthorized[i]] = false;
            emit AuthorizeSpender(_deauthorized[i], false);
        }
    }
    function setConsumeGasERC20Tokens(address[] memory _consumeGasERC20Tokens) external onlyOperator {
        for (uint256 i = 0; i < _consumeGasERC20Tokens.length; i++) {
            consumeGasERC20Tokens[_consumeGasERC20Tokens[i]] = true;
            emit SetConsumeGasERC20Token(_consumeGasERC20Tokens[i]);
        }
    }
    /************************************************************
    *                   External functions                      *
    *************************************************************/
    /// @dev Spend tokens on user's behalf. Only an authority can call this.
    /// @param _user The user to spend token from.
    /// @param _tokenAddr The address of the token.
    /// @param _amount Amount to spend.
    function spendFromUser(address _user, address _tokenAddr, uint256 _amount) external onlyAuthorized {
        require(! tokenBlacklist[_tokenAddr], "Spender: token is blacklisted");
        // Fix gas stipend for non standard ERC20 transfer in case token contract's SafeMath violation is triggered
        // and all gas are consumed.
        uint256 gasStipend;
        if(consumeGasERC20Tokens[_tokenAddr]) gasStipend = 80000;
        else gasStipend = gasleft();
        if (_tokenAddr != ETH_ADDRESS && _tokenAddr != ZERO_ADDRESS) {
            uint256 balanceBefore = IERC20(_tokenAddr).balanceOf(msg.sender);
            (bool callSucceed, bytes memory returndata) = address(allowanceTarget).call{gas: gasStipend}(
                abi.encodeWithSelector(
                    IAllowanceTarget.executeCall.selector,
                    _tokenAddr,
                    abi.encodeWithSelector(
                        IERC20.transferFrom.selector,
                        _user,
                        msg.sender,
                        _amount
                    )
                )
            );
            require(callSucceed, "Spender: ERC20 transferFrom failed");
            bytes memory decodedReturnData = abi.decode(returndata, (bytes));
            if (decodedReturnData.length > 0) { // Return data is optional
                // Tokens like ZRX returns false on failed transfer
                require(abi.decode(decodedReturnData, (bool)), "Spender: ERC20 transferFrom failed");
            }
            // Check balance
            uint256 balanceAfter = IERC20(_tokenAddr).balanceOf(msg.sender);
            require(balanceAfter.sub(balanceBefore) == _amount, "Spender: ERC20 transferFrom amount mismatch");
        }
    }
    /// @dev Spend tokens on user's behalf. Only an authority can call this.
    /// @param _user The user to spend token from.
    /// @param _tokenAddr The address of the token.
    /// @param _receiver The receiver of the token.
    /// @param _amount Amount to spend.
    function spendFromUserTo(address _user, address _tokenAddr, address _receiver, uint256 _amount) external onlyAuthorized {
        require(! tokenBlacklist[_tokenAddr], "Spender: token is blacklisted");
        // Fix gas stipend for non standard ERC20 transfer in case token contract's SafeMath violation is triggered
        // and all gas are consumed.
        uint256 gasStipend;
        if(consumeGasERC20Tokens[_tokenAddr]) gasStipend = 80000;
        else gasStipend = gasleft();
        if (_tokenAddr != ETH_ADDRESS && _tokenAddr != ZERO_ADDRESS) {
            uint256 balanceBefore = IERC20(_tokenAddr).balanceOf(msg.sender);
            (bool callSucceed, bytes memory returndata) = address(allowanceTarget).call{gas: gasStipend}(
                abi.encodeWithSelector(
                    IAllowanceTarget.executeCall.selector,
                    _tokenAddr,
                    abi.encodeWithSelector(
                        IERC20.transferFrom.selector,
                        _user,
                        _receiver,
                        _amount
                    )
                )
            );
            require(callSucceed, "Spender: ERC20 transferFrom failed");
            bytes memory decodedReturnData = abi.decode(returndata, (bytes));
            if (decodedReturnData.length > 0) { // Return data is optional
                // Tokens like ZRX returns false on failed transfer
                require(abi.decode(decodedReturnData, (bool)), "Spender: ERC20 transferFrom failed");
            }
            // Check balance
            uint256 balanceAfter = IERC20(_tokenAddr).balanceOf(msg.sender);
            require(balanceAfter.sub(balanceBefore) == _amount, "Spender: ERC20 transferFrom amount mismatch");
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev 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 ^0.6.5;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "../interfaces/IAMM.sol";
contract UserProxyStub {
    using SafeERC20 for IERC20;
    // Constants do not have storage slot.
    uint256 private constant MAX_UINT = 2**256 - 1;
    address private constant ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    address private constant ZERO_ADDRESS = address(0);
    /**
     * @dev Below are the variables which consume storage slots.
     */
    address public operator;
    address public weth;
    address public ammWrapperAddr;
    address public pmmAddr;
    address public rfqAddr;
    receive() external payable {
    }
    /**
     * @dev Access control and ownership management.
     */
    modifier onlyOperator() {
        require(operator == msg.sender, "UserProxyStub: not the operator");
        _;
    }
    /* End of access control and ownership management */
    /**
     * @dev Replacing constructor and initialize the contract. This function should only be called once.
     */
    constructor(address _weth) public {
        operator = msg.sender;
        weth = _weth;
    }
    function upgradePMM(address _pmmAddr) external onlyOperator {
        pmmAddr = _pmmAddr;
    }
    function upgradeAMMWrapper(address _ammWrapperAddr) external onlyOperator {
        ammWrapperAddr = _ammWrapperAddr;
    }
    function upgradeRFQ(address _rfqAddr) external onlyOperator {
        rfqAddr = _rfqAddr;
    }
    function toAMM(bytes calldata _payload) external payable {
        (bool callSucceed,) = ammWrapperAddr.call{value: msg.value}(_payload);
        if (callSucceed == false) {
            // Get the error message returned
            assembly {
                let ptr := mload(0x40)
                let size := returndatasize()
                returndatacopy(ptr, 0, size)
                revert(ptr, size)
            }
        }
    }
    function toPMM(bytes calldata _payload) external payable {
        (bool callSucceed,) = pmmAddr.call{value: msg.value}(_payload);
        if (callSucceed == false) {
            // Get the error message returned
            assembly {
                let ptr := mload(0x40)
                let size := returndatasize()
                returndatacopy(ptr, 0, size)
                revert(ptr, size)
            }
        }
    }
    function toRFQ(bytes calldata _payload) external payable {
        (bool callSucceed,) = rfqAddr.call{value: msg.value}(_payload);
        if (callSucceed == false) {
            // Get the error message returned
            assembly {
                let ptr := mload(0x40)
                let size := returndatasize()
                returndatacopy(ptr, 0, size)
                revert(ptr, size)
            }
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";
/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }
    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.
        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
pragma solidity ^0.6.0;
import "./ISetAllowance.sol";
interface IAMM is ISetAllowance {
    function trade(
        address _makerAddress,
        address _fromAssetAddress,
        address _toAssetAddress,
        uint256 _takerAssetAmount,
        uint256 _makerAssetAmount,
        uint256 _feeFactor,
        address _spender,
        address payable _receiver,
        uint256 _nonce,
        uint256 _deadline,
        bytes memory _sig
    ) payable external returns (uint256);
}pragma solidity ^0.6.0;
interface ISetAllowance {
    function setAllowance(address[] memory tokenList, address spender) external;
    function closeAllowance(address[] memory tokenList, address spender) external;
}pragma solidity ^0.6.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "../interfaces/ISetAllowance.sol";
import "../interfaces/IERC1271Wallet.sol";
contract ERC1271WalletStub is
    ISetAllowance,
    IERC1271Wallet
{
    using SafeERC20 for IERC20;
    // bytes4(keccak256("isValidSignature(bytes,bytes)"))
    bytes4 constant internal ERC1271_MAGICVALUE = 0x20c13b0b;
    // bytes4(keccak256("isValidSignature(bytes32,bytes)"))
    bytes4 constant internal ERC1271_MAGICVALUE_BYTES32 = 0x1626ba7e;
    uint256 private constant MAX_UINT = 2**256 - 1;
    address public operator;
    modifier onlyOperator() {
        require(operator == msg.sender, "Quoter: not the operator");
        _;
    }
    constructor (address _operator) public {
        operator = _operator;
    }
    function setAllowance(address[] memory _tokenList, address _spender) override external onlyOperator {
        for (uint256 i = 0 ; i < _tokenList.length; i++) {
            IERC20(_tokenList[i]).safeApprove(_spender, MAX_UINT);
        }
    }
    function closeAllowance(address[] memory _tokenList, address _spender) override external onlyOperator {
        for (uint256 i = 0 ; i < _tokenList.length; i++) {
            IERC20(_tokenList[i]).safeApprove(_spender, 0);
        }
    }
    function isValidSignature(
        bytes calldata _data,
        bytes calldata _signature)
        override
        external
        view
        returns (bytes4 magicValue)
    {
        return ERC1271_MAGICVALUE;
    }
    function isValidSignature(
        bytes32 _hash,
        bytes calldata _signature)
        override
        external
        view
        returns (bytes4 magicValue)
    {
        return ERC1271_MAGICVALUE_BYTES32;
    }
}
pragma solidity ^0.6.0;
interface  IERC1271Wallet {
  /**
   * @notice Verifies whether the provided signature is valid with respect to the provided data
   * @dev MUST return the correct magic value if the signature provided is valid for the provided data
   *   > The bytes4 magic value to return when signature is valid is 0x20c13b0b : bytes4(keccak256("isValidSignature(bytes,bytes)")
   *   > This function MAY modify Ethereum's state
   * @param _data       Arbitrary length data signed on the behalf of address(this)
   * @param _signature  Signature byte array associated with _data
   * @return magicValue Magic value 0x20c13b0b if the signature is valid and 0x0 otherwise
   *
   */
  function isValidSignature(
    bytes calldata _data,
    bytes calldata _signature)
    external
    view
    returns (bytes4 magicValue);
  /**
   * @notice Verifies whether the provided signature is valid with respect to the provided hash
   * @dev MUST return the correct magic value if the signature provided is valid for the provided hash
   *   > The bytes4 magic value to return when signature is valid is 0x20c13b0b : bytes4(keccak256("isValidSignature(bytes,bytes)")
   *   > This function MAY modify Ethereum's state
   * @param _hash       keccak256 hash that was signed
   * @param _signature  Signature byte array associated with _data
   * @return magicValue Magic value 0x20c13b0b if the signature is valid and 0x0 otherwise
   */
  function isValidSignature(
    bytes32 _hash,
    bytes calldata _signature)
    external
    view
    returns (bytes4 magicValue);
}pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "./interfaces/ISpender.sol";
import "./interfaces/IWeth.sol";
import "./interfaces/IRFQ.sol";
import "./interfaces/IPermanentStorage.sol";
import "./interfaces/IERC1271Wallet.sol";
import "./utils/RFQLibEIP712.sol";
contract RFQ is
    ReentrancyGuard,
    IRFQ,
    RFQLibEIP712,
    SignatureValidator
{
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    using Address for address;
    // Constants do not have storage slot.
    string public constant version = "5.2.0";
    uint256 private constant MAX_UINT = 2**256 - 1;
    string public constant SOURCE = "RFQ v1";
    uint256 private constant BPS_MAX = 10000;
    address public immutable userProxy;
    IPermanentStorage public immutable permStorage;
    IWETH public immutable weth;
    // Below are the variables which consume storage slots.
    address public operator;
    ISpender public spender;
    struct GroupedVars {
        bytes32 orderHash;
        bytes32 transactionHash;
    }
    // Operator events
    event TransferOwnership(address newOperator);
    event UpgradeSpender(address newSpender);
    event AllowTransfer(address spender);
    event DisallowTransfer(address spender);
    event DepositETH(uint256 ethBalance);
    event FillOrder(
        string source,
        bytes32 indexed transactionHash,
        bytes32 indexed orderHash,
        address indexed userAddr,
        address takerAssetAddr,
        uint256 takerAssetAmount,
        address makerAddr,
        address makerAssetAddr,
        uint256 makerAssetAmount,
        address receiverAddr,
        uint256 settleAmount,
        uint16 feeFactor
    );
    receive() external payable {}
    /************************************************************
    *          Access control and ownership management          *
    *************************************************************/
    modifier onlyOperator {
        require(operator == msg.sender, "RFQ: not operator");
        _;
    }
    modifier onlyUserProxy() {
        require(address(userProxy) == msg.sender, "RFQ: not the UserProxy contract");
        _;
    }
    function transferOwnership(address _newOperator) external onlyOperator {
        require(_newOperator != address(0), "RFQ: operator can not be zero address");
        operator = _newOperator;
        emit TransferOwnership(_newOperator);
    }
    /************************************************************
    *              Constructor and init functions               *
    *************************************************************/
    constructor (
        address _operator, 
        address _userProxy, 
        ISpender _spender, 
        IPermanentStorage _permStorage, 
        IWETH _weth
    ) public {
        operator = _operator;
        userProxy = _userProxy;
        spender = _spender;
        permStorage = _permStorage;
        weth = _weth;
    }
    /************************************************************
    *           Management functions for Operator               *
    *************************************************************/
    /**
     * @dev set new Spender
     */
    function upgradeSpender(address _newSpender) external onlyOperator {
        require(_newSpender != address(0), "RFQ: spender can not be zero address");
        spender = ISpender(_newSpender);
        emit UpgradeSpender(_newSpender);
    }
    /**
     * @dev approve spender to transfer tokens from this contract. This is used to collect fee.
     */
    function setAllowance(address[] calldata _tokenList, address _spender) override external onlyOperator {
        for (uint256 i = 0 ; i < _tokenList.length; i++) {
            IERC20(_tokenList[i]).safeApprove(_spender, MAX_UINT);
            emit AllowTransfer(_spender);
        }
    }
    function closeAllowance(address[] calldata _tokenList, address _spender) override external onlyOperator {
        for (uint256 i = 0 ; i < _tokenList.length; i++) {
            IERC20(_tokenList[i]).safeApprove(_spender, 0);
            emit DisallowTransfer(_spender);
        }
    }
    /**
     * @dev convert collected ETH to WETH
     */
    function depositETH() external onlyOperator {
        uint256 balance = address(this).balance;
        if (balance > 0) {
            weth.deposit{value: balance}();
            emit DepositETH(balance);
        }
    }
    /************************************************************
    *                   External functions                      *
    *************************************************************/
    function fill(
        RFQLibEIP712.Order memory _order,
        bytes memory _mmSignature,
        bytes memory _userSignature
    )
        override
        payable
        external
        nonReentrant
        onlyUserProxy
        returns (uint256)
    {
        // check the order deadline and fee factor
        require(_order.deadline >= block.timestamp, "RFQ: expired order");
        require(_order.feeFactor < BPS_MAX, "RFQ: invalid fee factor");
        GroupedVars memory vars;
        // Validate signatures
        vars.orderHash = _getOrderHash(_order);
        require(
            isValidSignature(
                _order.makerAddr,
                _getOrderSignDigestFromHash(vars.orderHash),
                bytes(""),
                _mmSignature
            ),
            "RFQ: invalid MM signature"
        );
        vars.transactionHash = _getTransactionHash(_order);
        require(
            isValidSignature(
                _order.takerAddr,
                _getTransactionSignDigestFromHash(vars.transactionHash),
                bytes(""),
                _userSignature
            ),
            "RFQ: invalid user signature"
        );
        // Set transaction as seen, PermanentStorage would throw error if transaction already seen.
        permStorage.setRFQTransactionSeen(vars.transactionHash);
        // Deposit to WETH if taker asset is ETH, else transfer from user
        if (address(weth) == _order.takerAssetAddr) {
            require(
                msg.value == _order.takerAssetAmount,
                "RFQ: insufficient ETH"
            );
            weth.deposit{value: msg.value}();
        } else {
            spender.spendFromUser(_order.takerAddr, _order.takerAssetAddr, _order.takerAssetAmount);
        }
        // Transfer from maker
        spender.spendFromUser(_order.makerAddr, _order.makerAssetAddr, _order.makerAssetAmount);
        // settle token/ETH to user
        return _settle(_order, vars);
    }
    // settle
    function _settle(
        RFQLibEIP712.Order memory _order,
        GroupedVars memory _vars
    ) internal returns(uint256) {
        // Transfer taker asset to maker
        IERC20(_order.takerAssetAddr).safeTransfer(_order.makerAddr, _order.takerAssetAmount);
        // Transfer maker asset to taker, sub fee
        uint256 settleAmount = _order.makerAssetAmount;
        if (_order.feeFactor > 0) {
            // settleAmount = settleAmount * (10000 - feeFactor) / 10000
            settleAmount = settleAmount.mul((BPS_MAX).sub(_order.feeFactor)).div(BPS_MAX);
        }
        // Transfer token/Eth to receiver
        if (_order.makerAssetAddr == address(weth)){
            weth.withdraw(settleAmount);
            payable(_order.receiverAddr).transfer(settleAmount);
        } else {
            IERC20(_order.makerAssetAddr).safeTransfer(_order.receiverAddr, settleAmount);
        }
        emit FillOrder(
            SOURCE,
            _vars.transactionHash,
            _vars.orderHash,
            _order.takerAddr,
            _order.takerAssetAddr,
            _order.takerAssetAmount,
            _order.makerAddr,
            _order.makerAssetAddr,
            _order.makerAssetAmount,
            _order.receiverAddr,
            settleAmount,
            uint16(_order.feeFactor)
        );
        return settleAmount;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    constructor () internal {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
pragma solidity ^0.6.0;
interface ISpender {
    function spendFromUser(address _user, address _tokenAddr, uint256 _amount) external;
    function spendFromUserTo(address _user, address _tokenAddr, address _receiverAddr, uint256 _amount) external;
}
pragma solidity ^0.6.0;
interface IWETH {
    function balanceOf(address account) external view returns (uint256);
    function deposit() external payable;
    function withdraw(uint256 amount) external;
    function transferFrom(address src, address dst, uint wad) external returns (bool);
}pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;
import "../utils/RFQLibEIP712.sol";
import "./ISetAllowance.sol";
interface IRFQ is ISetAllowance {
    function fill(
        RFQLibEIP712.Order memory _order,
        bytes memory _mmSignature,
        bytes memory _userSignature
    ) external payable returns (uint256);
}pragma solidity ^0.6.0;
interface IPermanentStorage {
    function wethAddr() external view returns (address);
    function getCurvePoolInfo(address _makerAddr, address _takerAssetAddr, address _makerAssetAddr) external view returns (int128 takerAssetIndex, int128 makerAssetIndex, uint16 swapMethod, bool supportGetDx);
    function setCurvePoolInfo(address _makerAddr, address[] calldata _underlyingCoins, address[] calldata _coins, bool _supportGetDx) external;
    function isTransactionSeen(bytes32 _transactionHash) external view returns (bool);  // Kept for backward compatability. Should be removed from AMM 5.2.1 upward
    function isAMMTransactionSeen(bytes32 _transactionHash) external view returns (bool);
    function isRFQTransactionSeen(bytes32 _transactionHash) external view returns (bool);
    function isRelayerValid(address _relayer) external view returns (bool);
    function setTransactionSeen(bytes32 _transactionHash) external;  // Kept for backward compatability. Should be removed from AMM 5.2.1 upward
    function setAMMTransactionSeen(bytes32 _transactionHash) external;
    function setRFQTransactionSeen(bytes32 _transactionHash) external;
    function setRelayersValid(address[] memory _relayers, bool[] memory _isValids) external;
}pragma solidity ^0.6.0;
import "./BaseLibEIP712.sol";
import "./SignatureValidator.sol";
contract RFQLibEIP712 is BaseLibEIP712 {
    /***********************************|
    |             Constants             |
    |__________________________________*/
    
    struct Order {
        address takerAddr;
        address makerAddr;
        address takerAssetAddr;
        address makerAssetAddr;
        uint256 takerAssetAmount;
        uint256 makerAssetAmount;
        address receiverAddr;
        uint256 salt;
        uint256 deadline;
        uint256 feeFactor;
    }
    bytes32 public constant ORDER_TYPEHASH = keccak256(
        abi.encodePacked(
            "Order(",
            "address takerAddr,",
            "address makerAddr,",
            "address takerAssetAddr,",
            "address makerAssetAddr,",
            "uint256 takerAssetAmount,",
            "uint256 makerAssetAmount,",
            "uint256 salt,",
            "uint256 deadline,",
            "uint256 feeFactor",
            ")"
        )
    );
    function _getOrderHash(Order memory _order) internal pure returns (bytes32 orderHash) {
        orderHash = keccak256(
            abi.encode(
                ORDER_TYPEHASH,
                _order.takerAddr,
                _order.makerAddr,
                _order.takerAssetAddr,
                _order.makerAssetAddr,
                _order.takerAssetAmount,
                _order.makerAssetAmount,
                _order.salt,
                _order.deadline,
                _order.feeFactor
            )
        );
    }
    function _getOrderSignDigest(Order memory _order) internal view returns (bytes32 orderSignDigest) {
        orderSignDigest = keccak256(
            abi.encodePacked(
                EIP191_HEADER,
                EIP712_DOMAIN_SEPARATOR,
                _getOrderHash(_order)
            )
        );
    }
    function _getOrderSignDigestFromHash(bytes32 _orderHash) internal view returns (bytes32 orderSignDigest) {
        orderSignDigest = keccak256(
            abi.encodePacked(
                EIP191_HEADER,
                EIP712_DOMAIN_SEPARATOR,
                _orderHash
            )
        );
    }
    bytes32 public constant FILL_WITH_PERMIT_TYPEHASH = keccak256(
        abi.encodePacked(
            "fillWithPermit(",
            "address makerAddr,",
            "address takerAssetAddr,",
            "address makerAssetAddr,",
            "uint256 takerAssetAmount,",
            "uint256 makerAssetAmount,",
            "address takerAddr,",
            "address receiverAddr,",
            "uint256 salt,",
            "uint256 deadline,",
            "uint256 feeFactor",
            ")"
        )
    );
    function _getTransactionHash(Order memory _order) internal pure returns(bytes32 transactionHash) {
        transactionHash = keccak256(
            abi.encode(
                FILL_WITH_PERMIT_TYPEHASH,
                _order.makerAddr,
                _order.takerAssetAddr,
                _order.makerAssetAddr,
                _order.takerAssetAmount,
                _order.makerAssetAmount,
                _order.takerAddr,
                _order.receiverAddr,
                _order.salt,
                _order.deadline,
                _order.feeFactor
            )
        );
    }
    function _getTransactionSignDigest(Order memory _order) internal view returns (bytes32 transactionSignDigest) {
        transactionSignDigest = keccak256(
            abi.encodePacked(
                EIP191_HEADER,
                EIP712_DOMAIN_SEPARATOR,
                _getTransactionHash(_order)
            )
        );
    }
    function _getTransactionSignDigestFromHash(bytes32 _txHash) internal view returns (bytes32 transactionSignDigest) {
        transactionSignDigest = keccak256(
            abi.encodePacked(
                EIP191_HEADER,
                EIP712_DOMAIN_SEPARATOR,
                _txHash
            )
        );
    }
}pragma solidity ^0.6.0;
contract BaseLibEIP712 {
    /***********************************|
    |             Constants             |
    |__________________________________*/
    // EIP-191 Header
    string public constant EIP191_HEADER = "\\x19\\x01";
    // EIP712Domain
    string public constant EIP712_DOMAIN_NAME = "Tokenlon";
    string public constant EIP712_DOMAIN_VERSION = "v5";
    // EIP712Domain Separator
    bytes32 public immutable EIP712_DOMAIN_SEPARATOR = keccak256(
        abi.encode(
            keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
            keccak256(bytes(EIP712_DOMAIN_NAME)),
            keccak256(bytes(EIP712_DOMAIN_VERSION)),
            getChainID(),
            address(this)
        )
    );
    /**
        * @dev Return `chainId`
        */
    function getChainID() internal pure returns (uint) {
        uint chainId;
        assembly {
            chainId := chainid()
        }
        return chainId;
    }
}pragma solidity ^0.6.0;
import "../interfaces/IERC1271Wallet.sol";
import "./LibBytes.sol";
interface IWallet {
    /// @dev Verifies that a signature is valid.
    /// @param hash Message hash that is signed.
    /// @param signature Proof of signing.
    /// @return isValid Validity of order signature.
    function isValidSignature(
        bytes32 hash,
        bytes memory signature
    )
        external
        view
        returns (bool isValid);
}
/**
 * @dev Contains logic for signature validation.
 * Signatures from wallet contracts assume ERC-1271 support (https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1271.md)
 * Notes: Methods are strongly inspired by contracts in https://github.com/0xProject/0x-monorepo/blob/development/
 */
contract SignatureValidator {
  using LibBytes for bytes;
  /***********************************|
  |             Variables             |
  |__________________________________*/
  // bytes4(keccak256("isValidSignature(bytes,bytes)"))
  bytes4 constant internal ERC1271_MAGICVALUE = 0x20c13b0b;
  // bytes4(keccak256("isValidSignature(bytes32,bytes)"))
  bytes4 constant internal ERC1271_MAGICVALUE_BYTES32 = 0x1626ba7e;
  // keccak256("isValidWalletSignature(bytes32,address,bytes)")
  bytes4 constant internal ERC1271_FALLBACK_MAGICVALUE_BYTES32 = 0xb0671381;
  // Allowed signature types.
  enum SignatureType {
    Illegal,                     // 0x00, default value
    Invalid,                     // 0x01
    EIP712,                      // 0x02
    EthSign,                     // 0x03
    WalletBytes,                 // 0x04  standard 1271 wallet type
    WalletBytes32,               // 0x05  standard 1271 wallet type
    Wallet,                      // 0x06  0x wallet type for signature compatibility
    NSignatureTypes              // 0x07, number of signature types. Always leave at end.
  }
  /***********************************|
  |        Signature Functions        |
  |__________________________________*/
  /**
   * @dev Verifies that a hash has been signed by the given signer.
   * @param _signerAddress  Address that should have signed the given hash.
   * @param _hash           Hash of the EIP-712 encoded data
   * @param _data           Full EIP-712 data structure that was hashed and signed
   * @param _sig            Proof that the hash has been signed by signer.
   *      For non wallet signatures, _sig is expected to be an array tightly encoded as
   *      (bytes32 r, bytes32 s, uint8 v, uint256 nonce, SignatureType sigType)
   * @return isValid True if the address recovered from the provided signature matches the input signer address.
   */
  function isValidSignature(
    address _signerAddress,
    bytes32 _hash,
    bytes memory _data,
    bytes memory _sig
  )
    public
    view
    returns (bool isValid)
  {
    require(
      _sig.length > 0,
      "SignatureValidator#isValidSignature: length greater than 0 required"
    );
    require(
      _signerAddress != address(0x0),
      "SignatureValidator#isValidSignature: invalid signer"
    );
    // Pop last byte off of signature byte array.
    uint8 signatureTypeRaw = uint8(_sig.popLastByte());
    // Ensure signature is supported
    require(
      signatureTypeRaw < uint8(SignatureType.NSignatureTypes),
      "SignatureValidator#isValidSignature: unsupported signature"
    );
    // Extract signature type
    SignatureType signatureType = SignatureType(signatureTypeRaw);
    // Variables are not scoped in Solidity.
    uint8 v;
    bytes32 r;
    bytes32 s;
    address recovered;
    // Always illegal signature.
    // This is always an implicit option since a signer can create a
    // signature array with invalid type or length. We may as well make
    // it an explicit option. This aids testing and analysis. It is
    // also the initialization value for the enum type.
    if (signatureType == SignatureType.Illegal) {
      revert("SignatureValidator#isValidSignature: illegal signature");
    // Signature using EIP712
    } else if (signatureType == SignatureType.EIP712) {
      require(
        _sig.length == 97,
        "SignatureValidator#isValidSignature: length 97 required"
      );
      r = _sig.readBytes32(0);
      s = _sig.readBytes32(32);
      v = uint8(_sig[64]);
      recovered = ecrecover(_hash, v, r, s);
      isValid = _signerAddress == recovered;
      return isValid;
    // Signed using web3.eth_sign() or Ethers wallet.signMessage()
    } else if (signatureType == SignatureType.EthSign) {
      require(
        _sig.length == 97,
        "SignatureValidator#isValidSignature: length 97 required"
      );
      r = _sig.readBytes32(0);
      s = _sig.readBytes32(32);
      v = uint8(_sig[64]);
      recovered = ecrecover(
        keccak256(abi.encodePacked("\\x19Ethereum Signed Message:\
32", _hash)),
        v,
        r,
        s
      );
      isValid = _signerAddress == recovered;
      return isValid;
    // Signature verified by wallet contract with data validation.
    } else if (signatureType == SignatureType.WalletBytes) {
      isValid = ERC1271_MAGICVALUE == IERC1271Wallet(_signerAddress).isValidSignature(_data, _sig);
      return isValid;
    // Signature verified by wallet contract without data validation.
    } else if (signatureType == SignatureType.WalletBytes32) {
      isValid = ERC1271_MAGICVALUE_BYTES32 == IERC1271Wallet(_signerAddress).isValidSignature(_hash, _sig);
      return isValid;
    } else if (signatureType == SignatureType.Wallet) {
      isValid = isValidWalletSignature(
          _hash,
          _signerAddress,
          _sig
      );
      return isValid;
    }
    // Anything else is illegal (We do not return false because
    // the signature may actually be valid, just not in a format
    // that we currently support. In this case returning false
    // may lead the caller to incorrectly believe that the
    // signature was invalid.)
    revert("SignatureValidator#isValidSignature: unsupported signature");
  }
  /// @dev Verifies signature using logic defined by Wallet contract.
  /// @param hash Any 32 byte hash.
  /// @param walletAddress Address that should have signed the given hash
  ///                      and defines its own signature verification method.
  /// @param signature Proof that the hash has been signed by signer.
  /// @return isValid True if signature is valid for given wallet..
  function isValidWalletSignature(
      bytes32 hash,
      address walletAddress,
      bytes memory signature
  )
      internal
      view
      returns (bool isValid)
  {
      bytes memory _calldata = abi.encodeWithSelector(
          IWallet(walletAddress).isValidSignature.selector,
          hash,
          signature
      );
      bytes32 magic_salt = bytes32(bytes4(keccak256("isValidWalletSignature(bytes32,address,bytes)")));
      assembly {
          if iszero(extcodesize(walletAddress)) {
              // Revert with `Error("WALLET_ERROR")`
              mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
              mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)
              mstore(64, 0x0000000c57414c4c45545f4552524f5200000000000000000000000000000000)
              mstore(96, 0)
              revert(0, 100)
          }
          let cdStart := add(_calldata, 32)
          let success := staticcall(
              gas(),              // forward all gas
              walletAddress,    // address of Wallet contract
              cdStart,          // pointer to start of input
              mload(_calldata),  // length of input
              cdStart,          // write output over input
              32                // output size is 32 bytes
          )
          if iszero(eq(returndatasize(), 32)) {
              // Revert with `Error("WALLET_ERROR")`
              mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
              mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)
              mstore(64, 0x0000000c57414c4c45545f4552524f5200000000000000000000000000000000)
              mstore(96, 0)
              revert(0, 100)
          }
          switch success
          case 0 {
              // Revert with `Error("WALLET_ERROR")`
              mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
              mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)
              mstore(64, 0x0000000c57414c4c45545f4552524f5200000000000000000000000000000000)
              mstore(96, 0)
              revert(0, 100)
          }
          case 1 {
              // Signature is valid if call did not revert and returned true
              isValid := eq(
                  and(mload(cdStart), 0xffffffff00000000000000000000000000000000000000000000000000000000),
                  and(magic_salt, 0xffffffff00000000000000000000000000000000000000000000000000000000)
              )
          }
      }
      return isValid;
  }
}
/*
  Copyright 2018 ZeroEx Intl.
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  http://www.apache.org/licenses/LICENSE-2.0
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  This is a truncated version of the original LibBytes.sol library from ZeroEx.
*/
pragma solidity ^0.6.0;
library LibBytes {
  using LibBytes for bytes;
  /***********************************|
  |        Pop Bytes Functions        |
  |__________________________________*/
  /**
   * @dev Pops the last byte off of a byte array by modifying its length.
   * @param b Byte array that will be modified.
   * @return result The byte that was popped off.
   */
  function popLastByte(bytes memory b)
    internal
    pure
    returns (bytes1 result)
  {
    require(
      b.length > 0,
      "LibBytes#popLastByte: greater than zero length required"
    );
    // Store last byte.
    result = b[b.length - 1];
    assembly {
      // Decrement length of byte array.
      let newLen := sub(mload(b), 1)
      mstore(b, newLen)
    }
    return result;
  }
  /// @dev Reads an address from a position in a byte array.
  /// @param b Byte array containing an address.
  /// @param index Index in byte array of address.
  /// @return result address from byte array.
  function readAddress(
    bytes memory b,
    uint256 index
  )
    internal
    pure
    returns (address result)
  {
    require(
      b.length >= index + 20,  // 20 is length of address
      "LibBytes#readAddress greater or equal to 20 length required"
    );
    // Add offset to index:
    // 1. Arrays are prefixed by 32-byte length parameter (add 32 to index)
    // 2. Account for size difference between address length and 32-byte storage word (subtract 12 from index)
    index += 20;
    // Read address from array memory
    assembly {
      // 1. Add index to address of bytes array
      // 2. Load 32-byte word from memory
      // 3. Apply 20-byte mask to obtain address
      result := and(mload(add(b, index)), 0xffffffffffffffffffffffffffffffffffffffff)
    }
    return result;
  }
  /***********************************|
  |        Read Bytes Functions       |
  |__________________________________*/
  /**
   * @dev Reads a bytes32 value from a position in a byte array.
   * @param b Byte array containing a bytes32 value.
   * @param index Index in byte array of bytes32 value.
   * @return result bytes32 value from byte array.
   */
  function readBytes32(
    bytes memory b,
    uint256 index
  )
    internal
    pure
    returns (bytes32 result)
  {
    require(
      b.length >= index + 32,
      "LibBytes#readBytes32 greater or equal to 32 length required"
    );
    // Arrays are prefixed by a 256 bit length parameter
    index += 32;
    // Read the bytes32 from array memory
    assembly {
      result := mload(add(b, index))
    }
    return result;
  }
  /// @dev Reads an unpadded bytes4 value from a position in a byte array.
  /// @param b Byte array containing a bytes4 value.
  /// @param index Index in byte array of bytes4 value.
  /// @return result bytes4 value from byte array.
  function readBytes4(
    bytes memory b,
    uint256 index
  )
    internal
    pure
    returns (bytes4 result)
  {
    require(
      b.length >= index + 4,
      "LibBytes#readBytes4 greater or equal to 4 length required"
    );
    // Arrays are prefixed by a 32 byte length field
    index += 32;
    // Read the bytes4 from array memory
    assembly {
      result := mload(add(b, index))
      // Solidity does not require us to clean the trailing bytes.
      // We do it anyway
      result := and(result, 0xFFFFFFFF00000000000000000000000000000000000000000000000000000000)
    }
    return result;
  }
  function readBytes2(
    bytes memory b,
    uint256 index
  )
    internal
    pure
    returns (bytes2 result)
  {
    require(
      b.length >= index + 2,
      "LibBytes#readBytes2 greater or equal to 2 length required"
    );
    // Arrays are prefixed by a 32 byte length field
    index += 32;
    // Read the bytes4 from array memory
    assembly {
      result := mload(add(b, index))
      // Solidity does not require us to clean the trailing bytes.
      // We do it anyway
      result := and(result, 0xFFFF000000000000000000000000000000000000000000000000000000000000)
    }
    return result;
  }
}pragma solidity 0.6.12;
import "../utils/LibBytes.sol";
import "./MultiSigLibEIP712.sol";
/**
 * @title MultiSig
 * @author dYdX
 *
 * Multi-Signature Wallet.
 * Allows multiple parties to agree on transactions before execution.
 * Adapted from Stefan George's MultiSigWallet contract.
 *
 * Logic Changes:
 *  - Removed the fallback function
 *  - Ensure newOwner is notNull
 *
 * Syntax Changes:
 *  - Update Solidity syntax for 0.5.X: use `emit` keyword (events), use `view` keyword (functions)
 *  - Add braces to all `if` and `for` statements
 *  - Remove named return variables
 *  - Add space before and after comparison operators
 *  - Add ADDRESS_ZERO as a constant
 *  - uint => uint256
 *  - external_call => externalCall
 */
contract MultiSig is MultiSigLibEIP712 {
    using LibBytes for bytes;
    // ============ Events ============
    event Deposit(address indexed depositer, uint256 amount);
    event Confirmation(address indexed sender, uint256 indexed transactionId);
    event Revocation(address indexed sender, uint256 indexed transactionId);
    event Submission(uint256 indexed transactionId);
    event Execution(uint256 indexed transactionId);
    event ExecutionFailure(uint256 indexed transactionId);
    event OwnerAddition(address indexed owner);
    event OwnerRemoval(address indexed owner);
    event RequirementChange(uint256 required);
    // ============ Constants ============
    uint256 constant public MAX_OWNER_COUNT = 50;
    address constant ADDRESS_ZERO = address(0x0);
    // ============ Storage ============
    mapping (uint256 => Transaction) public transactions;
    mapping (uint256 => mapping (address => bool)) public confirmations;
    mapping (address => bool) public isOwner;
    address[] public owners;
    uint256 public required;
    uint256 public transactionCount;
    // ============ Structs ============
    struct Transaction {
        address destination;
        uint256 value;
        bytes data;
        bool executed;
    }
    // ============ Modifiers ============
    modifier onlyWallet() {
        /* solium-disable-next-line error-reason */
        require(msg.sender == address(this));
        _;
    }
    modifier ownerDoesNotExist(
        address owner
    ) {
        /* solium-disable-next-line error-reason */
        require(!isOwner[owner]);
        _;
    }
    modifier ownerExists(
        address owner
    ) {
        /* solium-disable-next-line error-reason */
        require(isOwner[owner]);
        _;
    }
    modifier transactionExists(
        uint256 transactionId
    ) {
        /* solium-disable-next-line error-reason */
        require(transactions[transactionId].destination != ADDRESS_ZERO);
        _;
    }
    modifier confirmed(
        uint256 transactionId,
        address owner
    ) {
        /* solium-disable-next-line error-reason */
        require(confirmations[transactionId][owner]);
        _;
    }
    modifier notConfirmed(
        uint256 transactionId,
        address owner
    ) {
        /* solium-disable-next-line error-reason */
        require(!confirmations[transactionId][owner]);
        _;
    }
    modifier notExecuted(
        uint256 transactionId
    ) {
        /* solium-disable-next-line error-reason */
        require(!transactions[transactionId].executed);
        _;
    }
    modifier notNull(
        address _address
    ) {
        /* solium-disable-next-line error-reason */
        require(_address != ADDRESS_ZERO);
        _;
    }
    modifier validRequirement(
        uint256 ownerCount,
        uint256 _required
    ) {
        /* solium-disable-next-line error-reason */
        require(
            ownerCount <= MAX_OWNER_COUNT
            && _required <= ownerCount
            && _required != 0
            && ownerCount != 0
        );
        _;
    }
    // ========= Fallback function ==========
    receive() external payable {
        emit Deposit(msg.sender, msg.value);
    }
    // ============ Constructor ============
    /**
     * Contract constructor sets initial owners and required number of confirmations.
     *
     * @param  _owners    List of initial owners.
     * @param  _required  Number of required confirmations.
     */
    constructor(
        address[] memory _owners,
        uint256 _required
    )
        public
        validRequirement(_owners.length, _required)
        MultiSigLibEIP712()
    {
        for (uint256 i = 0; i < _owners.length; i++) {
            /* solium-disable-next-line error-reason */
            require(!isOwner[_owners[i]] && _owners[i] != ADDRESS_ZERO);
            isOwner[_owners[i]] = true;
        }
        owners = _owners;
        required = _required;
    }
    // ============ Wallet-Only Functions ============
    /**
     * Allows to add a new owner. Transaction has to be sent by wallet.
     *
     * @param  owner  Address of new owner.
     */
    function addOwner(
        address owner
    )
        public
        onlyWallet
        ownerDoesNotExist(owner)
        notNull(owner)
        validRequirement(owners.length + 1, required)
    {
        isOwner[owner] = true;
        owners.push(owner);
        emit OwnerAddition(owner);
    }
    /**
     * Allows to remove an owner. Transaction has to be sent by wallet.
     *
     * @param  owner  Address of owner.
     */
    function removeOwner(
        address owner
    )
        public
        onlyWallet
        ownerExists(owner)
    {
        isOwner[owner] = false;
        for (uint256 i = 0; i < owners.length - 1; i++) {
            if (owners[i] == owner) {
                owners[i] = owners[owners.length - 1];
                break;
            }
        }
        delete owners[owners.length - 1];
        if (required > owners.length) {
            changeRequirement(owners.length);
        }
        emit OwnerRemoval(owner);
    }
    /**
     * Allows to replace an owner with a new owner. Transaction has to be sent by wallet.
     *
     * @param  owner     Address of owner to be replaced.
     * @param  newOwner  Address of new owner.
     */
    function replaceOwner(
        address owner,
        address newOwner
    )
        public
        onlyWallet
        ownerExists(owner)
        ownerDoesNotExist(newOwner)
        notNull(newOwner)
    {
        for (uint256 i = 0; i < owners.length; i++) {
            if (owners[i] == owner) {
                owners[i] = newOwner;
                break;
            }
        }
        isOwner[owner] = false;
        isOwner[newOwner] = true;
        emit OwnerRemoval(owner);
        emit OwnerAddition(newOwner);
    }
    /**
     * Allows to change the number of required confirmations. Transaction has to be sent by wallet.
     *
     * @param  _required  Number of required confirmations.
     */
    function changeRequirement(
        uint256 _required
    )
        public
        onlyWallet
        validRequirement(owners.length, _required)
    {
        required = _required;
        emit RequirementChange(_required);
    }
    // ============ Owner Functions ============
    /**
     * Allows an owner to submit and confirm a transaction.
     *
     * @param  destination  Transaction target address.
     * @param  value        Transaction ether value.
     * @param  data         Transaction data payload.
     * @return              Transaction ID.
     */
    function submitTransaction(
        address destination,
        uint256 value,
        bytes memory data
    )
        public
        returns (uint256)
    {
        uint256 transactionId = addTransaction(destination, value, data);
        confirmTransaction(transactionId);
        return transactionId;
    }
    /**
     * Allows an owner to submit and confirm a transaction via meta transaction.
     *
     * @param  signer           Signer of the meta transaction.
     * @param  transactionId    Transaction ID of this transaction.
     * @param  destination      Transaction target address.
     * @param  value            Transaction ether value.
     * @param  data             Transaction data payload.
     * @param  sig              Signature.
     * @return                  Transaction ID.
     */
    function submitTransaction(
        address signer,
        uint256 transactionId,
        address destination,
        uint256 value,
        bytes memory data,
        bytes memory sig
    )
        public
        ownerExists(signer)
        returns (uint256)
    {
        // SUBMIT_TRANSACTION_TYPE_HASH = keccak256("submitTransaction(uint256 transactionId,address destination,uint256 value,bytes data)");
        bytes32 EIP712SignDigest = keccak256(
            abi.encodePacked(
                bytes1(0x19),
                bytes1(0x01),
                EIP712_DOMAIN_SEPARATOR,
                keccak256(
                    abi.encode(
                        SUBMIT_TRANSACTION_TYPE_HASH,
                        transactionId,
                        destination,
                        value,
                        data
                    )
                )
            )
        );
        validateSignature(signer, EIP712SignDigest, sig);
        uint256 _transactionId = addTransaction(destination, value, data);
        require(transactionId == _transactionId);
        confirmTransactionBySigner(signer, transactionId);
        return transactionId;
    }
    // confirm transaction on behalf of signer, not msg.sender
    function confirmTransactionBySigner(
        address signer,
        uint256 transactionId
    )
        internal
        transactionExists(transactionId)
        notConfirmed(transactionId, signer)
    {
        // Confirm
        confirmations[transactionId][signer] = true;
        emit Confirmation(signer, transactionId);
        // Execute
        executeTransactionBySigner(signer, transactionId);
    }
    // execute transaction on behalf of signer, not msg.sender
    function executeTransactionBySigner(
        address signer,
        uint256 transactionId
    )
        internal
        notExecuted(transactionId)
    {
        if (isConfirmed(transactionId)) {
            Transaction storage txn = transactions[transactionId];
            txn.executed = true;
            if (externalCall(
                txn.destination,
                txn.value,
                txn.data.length,
                txn.data)
            ) {
                emit Execution(transactionId);
            } else {
                emit ExecutionFailure(transactionId);
                txn.executed = false;
            }
        }
    }
    /**
     * Allows an owner to confirm a transaction.
     *
     * @param  transactionId  Transaction ID.
     */
    function confirmTransaction(
        uint256 transactionId
    )
        public
        virtual
        ownerExists(msg.sender)
        transactionExists(transactionId)
        notConfirmed(transactionId, msg.sender)
    {
        confirmations[transactionId][msg.sender] = true;
        emit Confirmation(msg.sender, transactionId);
        executeTransaction(transactionId);
    }
    /**
     * Allows an owner to confirm a transaction via meta transaction.
     *
     * @param  signer           Signer of the meta transaction.
     * @param  transactionId    Transaction ID.
     * @param  sig              Signature.
     */
    function confirmTransaction(
        address signer,
        uint256 transactionId,
        bytes memory sig
    )
        public
        virtual
        ownerExists(signer)
        transactionExists(transactionId)
        notConfirmed(transactionId, signer)
    {
        // CONFIRM_TRANSACTION_TYPE_HASH = keccak256("confirmTransaction(uint256 transactionId)");
        bytes32 EIP712SignDigest = keccak256(
            abi.encodePacked(
                bytes1(0x19),
                bytes1(0x01),
                EIP712_DOMAIN_SEPARATOR,
                keccak256(
                    abi.encode(
                        CONFIRM_TRANSACTION_TYPE_HASH,
                        transactionId
                    )
                )
            )
        );
        validateSignature(signer, EIP712SignDigest, sig);
        confirmations[transactionId][signer] = true;
        emit Confirmation(signer, transactionId);
        executeTransactionBySigner(signer, transactionId);
    }
    /**
     * Allows an owner to revoke a confirmation for a transaction.
     *
     * @param  transactionId  Transaction ID.
     */
    function revokeConfirmation(
        uint256 transactionId
    )
        public
        ownerExists(msg.sender)
        confirmed(transactionId, msg.sender)
        notExecuted(transactionId)
    {
        confirmations[transactionId][msg.sender] = false;
        emit Revocation(msg.sender, transactionId);
    }
    /**
     * Allows an owner to execute a confirmed transaction.
     *
     * @param  transactionId  Transaction ID.
     */
    function executeTransaction(
        uint256 transactionId
    )
        public
        virtual
        ownerExists(msg.sender)
        confirmed(transactionId, msg.sender)
        notExecuted(transactionId)
    {
        if (isConfirmed(transactionId)) {
            Transaction storage txn = transactions[transactionId];
            txn.executed = true;
            if (externalCall(
                txn.destination,
                txn.value,
                txn.data.length,
                txn.data)
            ) {
                emit Execution(transactionId);
            } else {
                emit ExecutionFailure(transactionId);
                txn.executed = false;
            }
        }
    }
    // ============ Getter Functions ============
    /**
     * Returns the confirmation status of a transaction.
     *
     * @param  transactionId  Transaction ID.
     * @return                Confirmation status.
     */
    function isConfirmed(
        uint256 transactionId
    )
        public
        view
        returns (bool)
    {
        uint256 count = 0;
        for (uint256 i = 0; i < owners.length; i++) {
            if (confirmations[transactionId][owners[i]]) {
                count += 1;
            }
            if (count == required) {
                return true;
            }
        }
    }
    /**
     * Returns number of confirmations of a transaction.
     *
     * @param  transactionId  Transaction ID.
     * @return                Number of confirmations.
     */
    function getConfirmationCount(
        uint256 transactionId
    )
        public
        view
        returns (uint256)
    {
        uint256 count = 0;
        for (uint256 i = 0; i < owners.length; i++) {
            if (confirmations[transactionId][owners[i]]) {
                count += 1;
            }
        }
        return count;
    }
    /**
     * Returns total number of transactions after filers are applied.
     *
     * @param  pending   Include pending transactions.
     * @param  executed  Include executed transactions.
     * @return           Total number of transactions after filters are applied.
     */
    function getTransactionCount(
        bool pending,
        bool executed
    )
        public
        view
        returns (uint256)
    {
        uint256 count = 0;
        for (uint256 i = 0; i < transactionCount; i++) {
            if (
                pending && !transactions[i].executed
                || executed && transactions[i].executed
            ) {
                count += 1;
            }
        }
        return count;
    }
    /**
     * Returns array of owners.
     *
     * @return  Array of owner addresses.
     */
    function getOwners()
        public
        view
        returns (address[] memory)
    {
        return owners;
    }
    /**
     * Returns array with owner addresses, which confirmed transaction.
     *
     * @param  transactionId  Transaction ID.
     * @return                Array of owner addresses.
     */
    function getConfirmations(
        uint256 transactionId
    )
        public
        view
        returns (address[] memory)
    {
        address[] memory confirmationsTemp = new address[](owners.length);
        uint256 count = 0;
        uint256 i;
        for (i = 0; i < owners.length; i++) {
            if (confirmations[transactionId][owners[i]]) {
                confirmationsTemp[count] = owners[i];
                count += 1;
            }
        }
        address[] memory _confirmations = new address[](count);
        for (i = 0; i < count; i++) {
            _confirmations[i] = confirmationsTemp[i];
        }
        return _confirmations;
    }
    /**
     * Returns list of transaction IDs in defined range.
     *
     * @param  from      Index start position of transaction array.
     * @param  to        Index end position of transaction array.
     * @param  pending   Include pending transactions.
     * @param  executed  Include executed transactions.
     * @return           Array of transaction IDs.
     */
    function getTransactionIds(
        uint256 from,
        uint256 to,
        bool pending,
        bool executed
    )
        public
        view
        returns (uint256[] memory)
    {
        uint256[] memory transactionIdsTemp = new uint256[](transactionCount);
        uint256 count = 0;
        uint256 i;
        for (i = 0; i < transactionCount; i++) {
            if (
                pending && !transactions[i].executed
                || executed && transactions[i].executed
            ) {
                transactionIdsTemp[count] = i;
                count += 1;
            }
        }
        uint256[] memory _transactionIds = new uint256[](to - from);
        for (i = from; i < to; i++) {
            _transactionIds[i - from] = transactionIdsTemp[i];
        }
        return _transactionIds;
    }
    // ============ Helper Functions ============
    function validateSignature(
        address signer,
        bytes32 digest,
        bytes memory sig
    )
        internal
    {
        require(sig.length == 65);
        uint8 v = uint8(sig[64]);
        bytes32 r = sig.readBytes32(0);
        bytes32 s = sig.readBytes32(32);
        address recovered = ecrecover(digest, v, r, s);
        require(signer == recovered);
    }
    // call has been separated into its own function in order to take advantage
    // of the Solidity's code generator to produce a loop that copies tx.data into memory.
    function externalCall(
        address destination,
        uint256 value,
        uint256 dataLength,
        bytes memory data
    )
        internal
        returns (bool)
    {
        bool result;
        /* solium-disable-next-line security/no-inline-assembly */
        assembly {
            let x := mload(0x40)   // "Allocate" memory for output (0x40 is where "free memory" pointer is stored by convention)
            let d := add(data, 32) // First 32 bytes are the padded length of data, so exclude that
            result := call(
                sub(gas(), 34710),   // 34710 is the value that solidity is currently emitting
                                   // It includes callGas (700) + callVeryLow (3, to pay for SUB) + callValueTransferGas (9000) +
                                   // callNewAccountGas (25000, in case the destination address does not exist and needs creating)
                destination,
                value,
                d,
                dataLength,        // Size of the input (in bytes) - this is what fixes the padding problem
                x,
                0                  // Output is ignored, therefore the output size is zero
            )
        }
        return result;
    }
    /**
     * Adds a new transaction to the transaction mapping, if transaction does not exist yet.
     *
     * @param  destination  Transaction target address.
     * @param  value        Transaction ether value.
     * @param  data         Transaction data payload.
     * @return              Transaction ID.
     */
    function addTransaction(
        address destination,
        uint256 value,
        bytes memory data
    )
        internal
        notNull(destination)
        returns (uint256)
    {
        uint256 transactionId = transactionCount;
        transactions[transactionId] = Transaction({
            destination: destination,
            value: value,
            data: data,
            executed: false
        });
        transactionCount += 1;
        emit Submission(transactionId);
        return transactionId;
    }
}pragma solidity 0.6.12;
contract MultiSigLibEIP712 {
    /***********************************|
  |             Constants             |
  |__________________________________*/
    // EIP712Domain
    string public constant EIP712_DOMAIN_NAME = "MultiSig";
    string public constant EIP712_DOMAIN_VERSION = "v1";
    // EIP712Domain Separator
    bytes32 public EIP712_DOMAIN_SEPARATOR;
    // SUBMIT_TRANSACTION_TYPE_HASH = keccak256("submitTransaction(uint256 transactionId,address destination,uint256 value,bytes data)");
    bytes32 public constant SUBMIT_TRANSACTION_TYPE_HASH = 0x2c78e27c3bb2592e67e8d37ad1a95bfccd188e77557c22593b1af0b920a08295;
    // CONFIRM_TRANSACTION_TYPE_HASH = keccak256("confirmTransaction(uint256 transactionId)");
    bytes32 public constant CONFIRM_TRANSACTION_TYPE_HASH = 0x3e96bdc38d4133bc81813a187b2d41bc74332643ce7dbe82c7d94ead8366a65f;
    constructor() public {
        EIP712_DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(EIP712_DOMAIN_NAME)),
                keccak256(bytes(EIP712_DOMAIN_VERSION)),
                getChainID(),
                address(this)
            )
        );
    }
    /**
    * @dev Return `chainId`
    */
    function getChainID() internal pure returns (uint) {
        uint chainId;
        assembly {
            chainId := chainid()
        }
        return chainId;
    }
}
pragma solidity 0.6.12;
import "./MultiSig.sol";
contract MiningTreasury is MultiSig {
    constructor (
        address[] memory _owners,
        uint256 _required
    )
        public
        MultiSig(_owners, _required)
    {
    }
}pragma solidity 0.6.12;
import "./MultiSig.sol";
// File: contracts/external/multisig/DelayedMultiSig.sol
/**
 * @title DelayedMultiSig
 * @author dYdX
 *
 * Multi-Signature Wallet with delay in execution.
 * Allows multiple parties to execute a transaction after a time lock has passed.
 * Adapted from Amir Bandeali's MultiSigWalletWithTimeLock contract.
 * Logic Changes:
 *  - Only owners can execute transactions
 *  - Require that each transaction succeeds
 *  - Added function to execute multiple transactions within the same Ethereum transaction
 */
contract DelayedMultiSig is
    MultiSig
{
    // ============ Events ============
    event ConfirmationTimeSet(uint256 indexed transactionId, uint256 confirmationTime);
    event TimeLockChange(uint32 secondsTimeLocked);
    // ============ Storage ============
    uint32 public secondsTimeLocked;
    mapping (uint256 => uint256) public confirmationTimes;
    // ============ Modifiers ============
    modifier notFullyConfirmed(
        uint256 transactionId
    ) {
        require(
            !isConfirmed(transactionId),
            "TX_FULLY_CONFIRMED"
        );
        _;
    }
    modifier fullyConfirmed(
        uint256 transactionId
    ) {
        require(
            isConfirmed(transactionId),
            "TX_NOT_FULLY_CONFIRMED"
        );
        _;
    }
    modifier pastTimeLock(
        uint256 transactionId
    ) virtual {
        require(
            block.timestamp >= confirmationTimes[transactionId] + secondsTimeLocked,
            "TIME_LOCK_INCOMPLETE"
        );
        _;
    }
    // ============ Constructor ============
    /**
     * Contract constructor sets initial owners, required number of confirmations, and time lock.
     *
     * @param  _owners             List of initial owners.
     * @param  _required           Number of required confirmations.
     * @param  _secondsTimeLocked  Duration needed after a transaction is confirmed and before it
     *                             becomes executable, in seconds.
     */
    constructor (
        address[] memory _owners,
        uint256 _required,
        uint32 _secondsTimeLocked
    )
        public
        MultiSig(_owners, _required)
    {
        secondsTimeLocked = _secondsTimeLocked;
    }
    // ============ Wallet-Only Functions ============
    /**
     * Changes the duration of the time lock for transactions.
     *
     * @param  _secondsTimeLocked  Duration needed after a transaction is confirmed and before it
     *                             becomes executable, in seconds.
     */
    function changeTimeLock(
        uint32 _secondsTimeLocked
    )
        public
        onlyWallet
    {
        secondsTimeLocked = _secondsTimeLocked;
        emit TimeLockChange(_secondsTimeLocked);
    }
    // ============ Owner Functions ============
    /**
     * Allows an owner to confirm a transaction.
     * Overrides the function in MultiSig.
     *
     * @param  transactionId  Transaction ID.
     */
    function confirmTransaction(
        uint256 transactionId
    )
        public
        override
        ownerExists(msg.sender)
        transactionExists(transactionId)
        notConfirmed(transactionId, msg.sender)
        notFullyConfirmed(transactionId)
    {
        confirmations[transactionId][msg.sender] = true;
        emit Confirmation(msg.sender, transactionId);
        if (isConfirmed(transactionId)) {
            setConfirmationTime(transactionId, block.timestamp);
        }
    }
    /**
     * Allows an owner to confirm a transaction via meta transaction.
     * Overrides the function in MultiSig.
     *
     * @param  signer           Signer of the meta transaction.
     * @param  transactionId    Transaction ID.
     * @param  sig              Signature.
     */
    function confirmTransaction(
        address signer,
        uint256 transactionId,
        bytes memory sig
    )
        public
        override
        ownerExists(signer)
        transactionExists(transactionId)
        notConfirmed(transactionId, signer)
        notFullyConfirmed(transactionId)
    {
        // CONFIRM_TRANSACTION_TYPE_HASH = keccak256("confirmTransaction(uint256 transactionId)");
        bytes32 EIP712SignDigest = keccak256(
            abi.encodePacked(
                bytes1(0x19),
                bytes1(0x01),
                EIP712_DOMAIN_SEPARATOR,
                keccak256(
                    abi.encode(
                        CONFIRM_TRANSACTION_TYPE_HASH,
                        transactionId
                    )
                )
            )
        );
        validateSignature(signer, EIP712SignDigest, sig);
        confirmations[transactionId][signer] = true;
        emit Confirmation(signer, transactionId);
        if (isConfirmed(transactionId)) {
            setConfirmationTime(transactionId, block.timestamp);
        }
    }
    /**
     * Allows an owner to execute a confirmed transaction.
     * Overrides the function in MultiSig.
     *
     * @param  transactionId  Transaction ID.
     */
    function executeTransaction(
        uint256 transactionId
    )
        public
        override
        ownerExists(msg.sender)
        notExecuted(transactionId)
        fullyConfirmed(transactionId)
        pastTimeLock(transactionId)
    {
        Transaction storage txn = transactions[transactionId];
        txn.executed = true;
        bool success = externalCall(
            txn.destination,
            txn.value,
            txn.data.length,
            txn.data
        );
        require(
            success,
            "TX_REVERTED"
        );
        emit Execution(transactionId);
    }
    /**
     * Allows an owner to execute multiple confirmed transactions.
     *
     * @param  transactionIds  List of transaction IDs.
     */
    function executeMultipleTransactions(
        uint256[] memory transactionIds
    )
        public
        ownerExists(msg.sender)
    {
        for (uint256 i = 0; i < transactionIds.length; i++) {
            executeTransaction(transactionIds[i]);
        }
    }
    // ============ Helper Functions ============
    /**
     * Sets the time of when a submission first passed.
     */
    function setConfirmationTime(
        uint256 transactionId,
        uint256 confirmationTime
    )
        internal
    {
        confirmationTimes[transactionId] = confirmationTime;
        emit ConfirmationTimeSet(transactionId, confirmationTime);
    }
}pragma solidity 0.6.12;
import "./DelayedMultiSig.sol";
// File: contracts/external/multisig/PartiallyDelayedMultiSig.sol
/**
 * @title PartiallyDelayedMultiSig
 * @author dYdX
 *
 * Multi-Signature Wallet with delay in execution except for some function selectors.
 */
contract PartiallyDelayedMultiSig is
    DelayedMultiSig
{
    // ============ Events ============
    event SelectorSet(address destination, bytes4 selector, bool approved);
    // ============ Constants ============
    bytes4 constant internal BYTES_ZERO = bytes4(0x0);
    // ============ Storage ============
    // destination => function selector => can bypass timelock
    mapping (address => mapping (bytes4 => bool)) public instantData;
    // ============ Modifiers ============
    // Overrides old modifier that requires a timelock for every transaction
    modifier pastTimeLock(
        uint256 transactionId
    ) override {
        // if the function selector is not exempt from timelock, then require timelock
        require(
            block.timestamp >= confirmationTimes[transactionId] + secondsTimeLocked
            || txCanBeExecutedInstantly(transactionId),
            "TIME_LOCK_INCOMPLETE"
        );
        _;
    }
    // ============ Constructor ============
    /**
     * Contract constructor sets initial owners, required number of confirmations, and time lock.
     *
     * @param  _owners               List of initial owners.
     * @param  _required             Number of required confirmations.
     * @param  _secondsTimeLocked    Duration needed after a transaction is confirmed and before it
     *                               becomes executable, in seconds.
     * @param  _noDelayDestinations  List of destinations that correspond with the selectors.
     *                               Zero address allows the function selector to be used with any
     *                               address.
     * @param  _noDelaySelectors     All function selectors that do not require a delay to execute.
     *                               Fallback function is 0x00000000.
     */
    constructor (
        address[] memory _owners,
        uint256 _required,
        uint32 _secondsTimeLocked,
        address[] memory _noDelayDestinations,
        bytes4[] memory _noDelaySelectors
    )
        public
        DelayedMultiSig(_owners, _required, _secondsTimeLocked)
    {
        require(
            _noDelayDestinations.length == _noDelaySelectors.length,
            "ADDRESS_AND_SELECTOR_MISMATCH"
        );
        for (uint256 i = 0; i < _noDelaySelectors.length; i++) {
            address destination = _noDelayDestinations[i];
            bytes4 selector = _noDelaySelectors[i];
            instantData[destination][selector] = true;
            emit SelectorSet(destination, selector, true);
        }
    }
    // ============ Wallet-Only Functions ============
    /**
     * Adds or removes functions that can be executed instantly. Transaction must be sent by wallet.
     *
     * @param  destination  Destination address of function. Zero address allows the function to be
     *                      sent to any address.
     * @param  selector     4-byte selector of the function. Fallback function is 0x00000000.
     * @param  approved     True if adding approval, false if removing approval.
     */
    function setSelector(
        address destination,
        bytes4 selector,
        bool approved
    )
        public
        onlyWallet
    {
        instantData[destination][selector] = approved;
        emit SelectorSet(destination, selector, approved);
    }
    // ============ Helper Functions ============
    /**
     * Returns true if transaction can be executed instantly (without timelock).
     */
    function txCanBeExecutedInstantly(
        uint256 transactionId
    )
        internal
        view
        returns (bool)
    {
        // get transaction from storage
        Transaction memory txn = transactions[transactionId];
        address dest = txn.destination;
        bytes memory data = txn.data;
        // fallback function
        if (data.length == 0) {
            return selectorCanBeExecutedInstantly(dest, BYTES_ZERO);
        }
        // invalid function selector
        if (data.length < 4) {
            return false;
        }
        // check first four bytes (function selector)
        bytes32 rawData;
        /* solium-disable-next-line security/no-inline-assembly */
        assembly {
            rawData := mload(add(data, 32))
        }
        bytes4 selector = bytes4(rawData);
        return selectorCanBeExecutedInstantly(dest, selector);
    }
    /**
     * Function selector is in instantData for address dest (or for address zero).
     */
    function selectorCanBeExecutedInstantly(
        address destination,
        bytes4 selector
    )
        internal
        view
        returns (bool)
    {
        return instantData[destination][selector]
            || instantData[ADDRESS_ZERO][selector];
    }
}pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;
import "./LibOrder.sol";
import "../../utils/LibBytes.sol";
contract LibDecoder {
    using LibBytes for bytes;
    function decodeFillOrder(bytes memory data) internal pure returns(LibOrder.Order memory order, uint256 takerFillAmount, bytes memory mmSignature) {
        require(
            data.length > 800,
            "LibDecoder: LENGTH_LESS_800"
        );
        // compare method_id
        // 0x64a3bc15 is fillOrKillOrder's method id.
        require(
            data.readBytes4(0) == 0x64a3bc15,
            "LibDecoder: WRONG_METHOD_ID"
        );
        
        bytes memory dataSlice;
        assembly {
            dataSlice := add(data, 4)
        }
        return abi.decode(dataSlice, (LibOrder.Order, uint256, bytes));
    }
    function decodeMmSignature(bytes memory signature) internal pure returns(uint8 v, bytes32 r, bytes32 s) {
        v = uint8(signature[0]);
        r = signature.readBytes32(1);
        s = signature.readBytes32(33);
        return (v, r, s);
    }
    function decodeUserSignatureWithoutSign(bytes memory signature) internal pure returns(address receiver) {
        require(
            signature.length == 85 || signature.length == 86,
            "LibDecoder: LENGTH_85_REQUIRED"
        );
        receiver = signature.readAddress(65);
        return receiver;
    }
    function decodeUserSignature(bytes memory signature) internal pure returns(uint8 v, bytes32 r, bytes32 s, address receiver) {
        receiver = decodeUserSignatureWithoutSign(signature);
        v = uint8(signature[0]);
        r = signature.readBytes32(1);
        s = signature.readBytes32(33);
        return (v, r, s, receiver);
    }
    function decodeERC20Asset(bytes memory assetData) internal pure returns(address) {
        require(
            assetData.length == 36,
            "LibDecoder: LENGTH_36_REQUIRED"
        );
        return assetData.readAddress(16);
    }
}/*
  Copyright 2018 ZeroEx Intl.
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/
pragma solidity ^0.6.0;
import "./LibEIP712.sol";
contract LibOrder is
    LibEIP712
{
    // Hash for the EIP712 Order Schema
    bytes32 constant internal EIP712_ORDER_SCHEMA_HASH = keccak256(abi.encodePacked(
        "Order(",
        "address makerAddress,",
        "address takerAddress,",
        "address feeRecipientAddress,",
        "address senderAddress,",
        "uint256 makerAssetAmount,",
        "uint256 takerAssetAmount,",
        "uint256 makerFee,",
        "uint256 takerFee,",
        "uint256 expirationTimeSeconds,",
        "uint256 salt,",
        "bytes makerAssetData,",
        "bytes takerAssetData",
        ")"
    ));
    // A valid order remains fillable until it is expired, fully filled, or cancelled.
    // An order's state is unaffected by external factors, like account balances.
    enum OrderStatus {
        INVALID,                     // Default value
        INVALID_MAKER_ASSET_AMOUNT,  // Order does not have a valid maker asset amount
        INVALID_TAKER_ASSET_AMOUNT,  // Order does not have a valid taker asset amount
        FILLABLE,                    // Order is fillable
        EXPIRED,                     // Order has already expired
        FULLY_FILLED,                // Order is fully filled
        CANCELLED                    // Order has been cancelled
    }
    // solhint-disable max-line-length
    struct Order {
        address makerAddress;           // Address that created the order.      
        address takerAddress;           // Address that is allowed to fill the order. If set to 0, any address is allowed to fill the order.          
        address feeRecipientAddress;    // Address that will recieve fees when order is filled.      
        address senderAddress;          // Address that is allowed to call Exchange contract methods that affect this order. If set to 0, any address is allowed to call these methods.
        uint256 makerAssetAmount;       // Amount of makerAsset being offered by maker. Must be greater than 0.        
        uint256 takerAssetAmount;       // Amount of takerAsset being bid on by maker. Must be greater than 0.        
        uint256 makerFee;               // Amount of ZRX paid to feeRecipient by maker when order is filled. If set to 0, no transfer of ZRX from maker to feeRecipient will be attempted.
        uint256 takerFee;               // Amount of ZRX paid to feeRecipient by taker when order is filled. If set to 0, no transfer of ZRX from taker to feeRecipient will be attempted.
        uint256 expirationTimeSeconds;  // Timestamp in seconds at which order expires.          
        uint256 salt;                   // Arbitrary number to facilitate uniqueness of the order's hash.     
        bytes makerAssetData;           // Encoded data that can be decoded by a specified proxy contract when transferring makerAsset. The last byte references the id of this proxy.
        bytes takerAssetData;           // Encoded data that can be decoded by a specified proxy contract when transferring takerAsset. The last byte references the id of this proxy.
    }
    // solhint-enable max-line-length
    struct OrderInfo {
        uint8 orderStatus;                    // Status that describes order's validity and fillability.
        bytes32 orderHash;                    // EIP712 hash of the order (see LibOrder.getOrderHash).
        uint256 orderTakerAssetFilledAmount;  // Amount of order that has already been filled.
    }
    /// @dev Calculates Keccak-256 hash of the order.
    /// @param order The order structure.
    /// @return orderHash Keccak-256 EIP712 hash of the order.
    function getOrderHash(Order memory order)
        internal
        view
        returns (bytes32 orderHash)
    {
        orderHash = hashEIP712Message(hashOrder(order));
        return orderHash;
    }
    /// @dev Calculates EIP712 hash of the order.
    /// @param order The order structure.
    /// @return result EIP712 hash of the order.
    function hashOrder(Order memory order)
        internal
        pure
        returns (bytes32 result)
    {
        bytes32 schemaHash = EIP712_ORDER_SCHEMA_HASH;
        bytes32 makerAssetDataHash = keccak256(order.makerAssetData);
        bytes32 takerAssetDataHash = keccak256(order.takerAssetData);
        // Assembly for more efficiently computing:
        // keccak256(abi.encodePacked(
        //     EIP712_ORDER_SCHEMA_HASH,
        //     bytes32(order.makerAddress),
        //     bytes32(order.takerAddress),
        //     bytes32(order.feeRecipientAddress),
        //     bytes32(order.senderAddress),
        //     order.makerAssetAmount,
        //     order.takerAssetAmount,
        //     order.makerFee,
        //     order.takerFee,
        //     order.expirationTimeSeconds,
        //     order.salt,
        //     keccak256(order.makerAssetData),
        //     keccak256(order.takerAssetData)
        // ));
        assembly {
            // Calculate memory addresses that will be swapped out before hashing
            let pos1 := sub(order, 32)
            let pos2 := add(order, 320)
            let pos3 := add(order, 352)
            // Backup
            let temp1 := mload(pos1)
            let temp2 := mload(pos2)
            let temp3 := mload(pos3)
            
            // Hash in place
            mstore(pos1, schemaHash)
            mstore(pos2, makerAssetDataHash)
            mstore(pos3, takerAssetDataHash)
            result := keccak256(pos1, 416)
            
            // Restore
            mstore(pos1, temp1)
            mstore(pos2, temp2)
            mstore(pos3, temp3)
        }
        return result;
    }
}/*
  Copyright 2018 ZeroEx Intl.
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/
pragma solidity ^0.6.0;
contract LibEIP712 {
    // EIP191 header for EIP712 prefix
    string constant internal EIP191_HEADER = "\\x19\\x01";
    // EIP712 Domain Name value
    string constant internal EIP712_DOMAIN_NAME = "0x Protocol";
    // EIP712 Domain Version value
    string constant internal EIP712_DOMAIN_VERSION = "2";
    // Hash of the EIP712 Domain Separator Schema
    bytes32 constant internal EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH = keccak256(abi.encodePacked(
        "EIP712Domain(",
        "string name,",
        "string version,",
        "address verifyingContract",
        ")"
    ));
    // Hash of the EIP712 Domain Separator data
    // solhint-disable-next-line var-name-mixedcase
    bytes32 public EIP712_DOMAIN_HASH;
    constructor ()
        public
    {
        EIP712_DOMAIN_HASH = keccak256(abi.encodePacked(
            EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH,
            keccak256(bytes(EIP712_DOMAIN_NAME)),
            keccak256(bytes(EIP712_DOMAIN_VERSION)),
            bytes12(0),
            address(this)
        ));
    }
    /// @dev Calculates EIP712 encoding for a hash struct in this EIP712 Domain.
    /// @param hashStruct The EIP712 hash struct.
    /// @return result EIP712 hash applied to this EIP712 Domain.
    function hashEIP712Message(bytes32 hashStruct)
        internal
        view
        returns (bytes32 result)
    {
        bytes32 eip712DomainHash = EIP712_DOMAIN_HASH;
        // Assembly for more efficient computing:
        // keccak256(abi.encodePacked(
        //     EIP191_HEADER,
        //     EIP712_DOMAIN_HASH,
        //     hashStruct    
        // ));
        assembly {
            // Load free memory pointer
            let memPtr := mload(64)
            mstore(memPtr, 0x1901000000000000000000000000000000000000000000000000000000000000)  // EIP191 header
            mstore(add(memPtr, 2), eip712DomainHash)                                            // EIP712 domain hash
            mstore(add(memPtr, 34), hashStruct)                                                 // Hash of struct
            // Compute hash
            result := keccak256(memPtr, 66)
        }
        return result;
    }
}pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "./pmm/0xLibs/LibOrder.sol";
import "./pmm/0xLibs/LibDecoder.sol";
import "./pmm/0xLibs/LibEncoder.sol";
import "./interfaces/ISpender.sol";
import "./interfaces/IZeroExchange.sol";
import "./interfaces/IWeth.sol";
import "./interfaces/IPMM.sol";
import "./interfaces/IPermanentStorage.sol";
import "./interfaces/IERC1271Wallet.sol";
contract PMM is
    ReentrancyGuard,
    IPMM,
    LibOrder,
    LibDecoder,
    LibEncoder
{
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    using Address for address;
    // Constants do not have storage slot.
    string public constant version = "5.0.0";
    uint256 private constant MAX_UINT = 2**256 - 1;
    string public constant SOURCE = "0x v2";
    uint256 private constant BPS_MAX = 10000;
    bytes4 constant internal ERC1271_MAGICVALUE_BYTES32 = 0x1626ba7e;  // bytes4(keccak256("isValidSignature(bytes32,bytes)"))
    address public immutable userProxy;
    ISpender public immutable spender;
    IPermanentStorage public immutable permStorage;
    IZeroExchange public immutable zeroExchange;
    address public immutable zxERC20Proxy;
    // Below are the variables which consume storage slots.
    address public operator;
    struct TradeInfo {
        address user;
        address receiver;
        uint16 feeFactor;
        address makerAssetAddr;
        address takerAssetAddr;
        bytes32 transactionHash;
        bytes32 orderHash;
    }
    // events
    event FillOrder(
        string source,
        bytes32 indexed transactionHash,
        bytes32 indexed orderHash,
        address indexed userAddr,
        address takerAssetAddr,
        uint256 takerAssetAmount,
        address makerAddr,
        address makerAssetAddr,
        uint256 makerAssetAmount,
        address receiverAddr,
        uint256 settleAmount,
        uint16 feeFactor
    );
    receive() external payable {}
    /************************************************************
    *          Access control and ownership management          *
    *************************************************************/
    modifier onlyOperator {
        require(operator == msg.sender, "PMM: not operator");
        _;
    }
    modifier onlyUserProxy() {
        require(address(userProxy) == msg.sender, "PMM: not the UserProxy contract");
        _;
    }
    function transferOwnership(address _newOperator) external onlyOperator {
        require(_newOperator != address(0), "AMMWrapper: operator can not be zero address");
        operator = _newOperator;
    }
    /************************************************************
    *              Constructor and init functions               *
    *************************************************************/
    constructor (address _operator, address _userProxy, ISpender _spender, IPermanentStorage _permStorage, IZeroExchange _zeroExchange, address _zxERC20Proxy) public {
        operator = _operator;
        userProxy = _userProxy;
        spender = _spender;
        permStorage = _permStorage;
        zeroExchange = _zeroExchange;
        zxERC20Proxy = _zxERC20Proxy;
        // This constant follows ZX_EXCHANGE address
        EIP712_DOMAIN_HASH = keccak256(
            abi.encodePacked(
                EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH,
                keccak256(bytes(EIP712_DOMAIN_NAME)),
                keccak256(bytes(EIP712_DOMAIN_VERSION)),
                bytes12(0),
                address(_zeroExchange)
            )
        );
    }
    /************************************************************
    *           Management functions for Operator               *
    *************************************************************/
    /**
     * @dev approve spender to transfer tokens from this contract. This is used to collect fee.
     */
    function setAllowance(address[] calldata _tokenList, address _spender) override external onlyOperator {
        for (uint256 i = 0 ; i < _tokenList.length; i++) {
            IERC20(_tokenList[i]).safeApprove(_spender, MAX_UINT);
        }
    }
    function closeAllowance(address[] calldata _tokenList, address _spender) override external onlyOperator {
        for (uint256 i = 0 ; i < _tokenList.length; i++) {
            IERC20(_tokenList[i]).safeApprove(_spender, 0);
        }
    }
    /************************************************************
    *                   External functions                      *
    *************************************************************/
    function fill(
        uint256 userSalt,
        bytes memory data,
        bytes memory userSignature
    )
        override
        public
        payable
        onlyUserProxy
        nonReentrant
        returns (uint256)
    {
        // decode & assert
        (LibOrder.Order memory order,
        TradeInfo memory tradeInfo) = _assertTransaction(userSalt, data, userSignature);
        // Deposit to WETH if taker asset is ETH, else transfer from user
        IWETH weth = IWETH(permStorage.wethAddr());
        if (address(weth) == tradeInfo.takerAssetAddr) {
            require(
                msg.value == order.takerAssetAmount,
                "PMM: insufficient ETH"
            );
            weth.deposit{value: msg.value}();
        } else {
            spender.spendFromUser(tradeInfo.user, tradeInfo.takerAssetAddr, order.takerAssetAmount);
        }
        IERC20(tradeInfo.takerAssetAddr).safeIncreaseAllowance(zxERC20Proxy, order.takerAssetAmount);
        // send tx to 0x
        zeroExchange.executeTransaction(
            userSalt,
            address(this),
            data,
            ""
        );
        // settle token/ETH to user
        uint256 settleAmount = _settle(weth, tradeInfo.receiver, tradeInfo.makerAssetAddr, order.makerAssetAmount, tradeInfo.feeFactor);
        IERC20(tradeInfo.takerAssetAddr).safeApprove(zxERC20Proxy, 0);
        emit FillOrder(
            SOURCE,
            tradeInfo.transactionHash,
            tradeInfo.orderHash,
            tradeInfo.user,
            tradeInfo.takerAssetAddr,
            order.takerAssetAmount,
            order.makerAddress,
            tradeInfo.makerAssetAddr,
            order.makerAssetAmount,
            tradeInfo.receiver,
            settleAmount,
            tradeInfo.feeFactor
        );
        return settleAmount;
    }
    /**
     * @dev internal function of `fill`.
     * It decodes and validates transaction data.
     */
    function _assertTransaction(
        uint256 userSalt,
        bytes memory data,
        bytes memory userSignature
    )
        internal
        view
        returns(
            LibOrder.Order memory order,
            TradeInfo memory tradeInfo
        )
    {
        // decode fillOrder data
        uint256 takerFillAmount;
        bytes memory mmSignature;
        (order, takerFillAmount, mmSignature) = decodeFillOrder(data);
        require(
            order.takerAddress == address(this),
            "PMM: incorrect taker"
        );
        require(
            order.takerAssetAmount == takerFillAmount,
            "PMM: incorrect fill amount"
        );
        // generate transactionHash
        tradeInfo.transactionHash = encodeTransactionHash(
            userSalt,
            address(this),
            data
        );
        tradeInfo.orderHash = getOrderHash(order);
        tradeInfo.feeFactor = uint16(order.salt);
        tradeInfo.receiver = decodeUserSignatureWithoutSign(userSignature);
        tradeInfo.user = _ecrecoverAddress(tradeInfo.transactionHash, userSignature);
        if (tradeInfo.user != order.feeRecipientAddress) {
            require(
                order.feeRecipientAddress.isContract(),
                "PMM: invalid contract address"
            );
            // isValidSignature() should return magic value: bytes4(keccak256("isValidSignature(bytes32,bytes)"))
            require(
                ERC1271_MAGICVALUE_BYTES32 == IERC1271Wallet(order.feeRecipientAddress)
                    .isValidSignature(
                        tradeInfo.transactionHash,
                        userSignature
                    ),
                "PMM: invalid ERC1271 signer"
            );
            tradeInfo.user = order.feeRecipientAddress;
        }
        require(
            tradeInfo.feeFactor < BPS_MAX,
            "PMM: invalid fee factor"
        );
        require(
            tradeInfo.receiver != address(0),
            "PMM: invalid receiver"
        );
        // decode asset
        // just support ERC20
        tradeInfo.makerAssetAddr = decodeERC20Asset(order.makerAssetData);
        tradeInfo.takerAssetAddr = decodeERC20Asset(order.takerAssetData);
        return (
            order,
            tradeInfo
        );        
    }
    // settle
    function _settle(IWETH weth, address receiver, address makerAssetAddr, uint256 makerAssetAmount, uint16 feeFactor) internal returns(uint256) {
        uint256 settleAmount = makerAssetAmount;
        if (feeFactor > 0) {
            // settleAmount = settleAmount * (10000 - feeFactor) / 10000
            settleAmount = settleAmount.mul((BPS_MAX).sub(feeFactor)).div(BPS_MAX);
        }
        if (makerAssetAddr == address(weth)){
            weth.withdraw(settleAmount);
            payable(receiver).transfer(settleAmount);
        } else {
            IERC20(makerAssetAddr).safeTransfer(receiver, settleAmount);
        }
        return settleAmount;
    }
    function _ecrecoverAddress(bytes32 transactionHash, bytes memory signature) internal pure returns (address){
        (uint8 v, bytes32 r, bytes32 s, address receiver) = decodeUserSignature(signature);
        return ecrecover(
            keccak256(
                abi.encodePacked(
                    transactionHash,
                    receiver
                )),
            v, r, s
        );
    }
}
pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;
import "./LibEIP712.sol";
contract LibEncoder is
    LibEIP712
{
    // Hash for the EIP712 ZeroEx Transaction Schema
    bytes32 constant internal EIP712_ZEROEX_TRANSACTION_SCHEMA_HASH = keccak256(
        abi.encodePacked(
        "ZeroExTransaction(",
        "uint256 salt,",
        "address signerAddress,",
        "bytes data",
        ")"
    ));
    function encodeTransactionHash(
        uint256 salt,
        address signerAddress,
        bytes memory data
    )
        internal
        view 
        returns (bytes32 result)
    {
        bytes32 schemaHash = EIP712_ZEROEX_TRANSACTION_SCHEMA_HASH;
        bytes32 dataHash = keccak256(data);
        // Assembly for more efficiently computing:
        // keccak256(abi.encodePacked(
        //     EIP712_ZEROEX_TRANSACTION_SCHEMA_HASH,
        //     salt,
        //     bytes32(signerAddress),
        //     keccak256(data)
        // ));
        assembly {
            // Load free memory pointer
            let memPtr := mload(64)
            mstore(memPtr, schemaHash)                                                               // hash of schema
            mstore(add(memPtr, 32), salt)                                                            // salt
            mstore(add(memPtr, 64), and(signerAddress, 0xffffffffffffffffffffffffffffffffffffffff))  // signerAddress
            mstore(add(memPtr, 96), dataHash)                                                        // hash of data
            // Compute hash
            result := keccak256(memPtr, 128)
        }
        result = hashEIP712Message(result);
        return result;
    }
}/*
  Copyright 2018 ZeroEx Intl.
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/
pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;
interface IZeroExchange {
    function executeTransaction(
        uint256 salt,
        address signerAddress,
        bytes calldata data,
        bytes calldata signature
    ) external;
}
pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;
import "../pmm/0xLibs/LibOrder.sol";
import "./ISetAllowance.sol";
interface IPMM is ISetAllowance {
    function fill(
        uint256 userSalt,
        bytes memory data,
        bytes memory userSignature
    ) external payable returns (uint256);
}// SPDX-License-Identifier: MIT
pragma solidity ^0.6.5;
import "../interfaces/IPermanentStorage.sol";
import "../utils/lib_storage/PSStorage.sol";
contract PermanentStorageStub is IPermanentStorage {
    // Supported Curve pools
    address public constant CURVE_COMPOUND_POOL = 0xA2B47E3D5c44877cca798226B7B8118F9BFb7A56;
    address public constant CURVE_USDT_POOL = 0x52EA46506B9CC5Ef470C5bf89f17Dc28bB35D85C;
    address public constant CURVE_Y_POOL = 0x45F783CCE6B7FF23B2ab2D70e416cdb7D6055f51;
    address public constant CURVE_3_POOL = 0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7;
    address public constant CURVE_sUSD_POOL = 0xA5407eAE9Ba41422680e2e00537571bcC53efBfD;
    address public constant CURVE_BUSD_POOL = 0x79a8C46DeA5aDa233ABaFFD40F3A0A2B1e5A4F27;
    address public constant CURVE_renBTC_POOL = 0x93054188d876f558f4a66B2EF1d97d16eDf0895B;
    address public constant CURVE_sBTC_POOL = 0x7fC77b5c7614E1533320Ea6DDc2Eb61fa00A9714;
    address public constant CURVE_hBTC_POOL = 0x4CA9b3063Ec5866A4B82E437059D2C43d1be596F;
    address public constant CURVE_sETH_POOL = 0xc5424B857f758E906013F3555Dad202e4bdB4567;
    // Curve coins
    address private constant ETH = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    address private constant DAI = 0x6B175474E89094C44Da98b954EedeAC495271d0F;
    address private constant USDC = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48;
    address private constant cDAI = 0x5d3a536E4D6DbD6114cc1Ead35777bAB948E3643;
    address private constant cUSDC = 0x39AA39c021dfbaE8faC545936693aC917d5E7563;
    address private constant USDT = 0xdAC17F958D2ee523a2206206994597C13D831ec7;
    address private constant TUSD = 0x0000000000085d4780B73119b644AE5ecd22b376;
    address private constant Y_POOL_yDAI = 0x16de59092dAE5CcF4A1E6439D611fd0653f0Bd01;
    address private constant Y_POOL_yUSDC = 0xd6aD7a6750A7593E092a9B218d66C0A814a3436e;
    address private constant Y_POOL_yUSDT = 0x83f798e925BcD4017Eb265844FDDAbb448f1707D;
    address private constant Y_POOL_yTUSD = 0x73a052500105205d34Daf004eAb301916DA8190f;
    address private constant sUSD = 0x57Ab1ec28D129707052df4dF418D58a2D46d5f51;
    address private constant BUSD = 0x4Fabb145d64652a948d72533023f6E7A623C7C53;
    address private constant BUSD_POOL_yDAI = 0xC2cB1040220768554cf699b0d863A3cd4324ce32;
    address private constant BUSD_POOL_yUSDC = 0x26EA744E5B887E5205727f55dFBE8685e3b21951;
    address private constant BUSD_POOL_yUSDT = 0xE6354ed5bC4b393a5Aad09f21c46E101e692d447;
    address private constant BUSD_POOL_yBUSD = 0x04bC0Ab673d88aE9dbC9DA2380cB6B79C4BCa9aE;
    address private constant renBTC = 0xEB4C2781e4ebA804CE9a9803C67d0893436bB27D;
    address private constant wBTC = 0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599;
    address private constant sBTC = 0xfE18be6b3Bd88A2D2A7f928d00292E7a9963CfC6;
    address private constant hBTC = 0x0316EB71485b0Ab14103307bf65a021042c6d380;
    address private constant sETH = 0x5e74C9036fb86BD7eCdcb084a0673EFc32eA31cb;
    constructor() public {
        // register WETH address
        PSStorage.getStorage().wethAddr = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
        // register Compound pool
        // underlying_coins, exchange_underlying
        AMMWrapperStorage.getStorage().curveTokenIndexes[CURVE_COMPOUND_POOL][DAI] = 1;
        AMMWrapperStorage.getStorage().curveTokenIndexes[CURVE_COMPOUND_POOL][USDC] = 2;
        // coins, exchange
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_COMPOUND_POOL][cDAI] = 1;
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_COMPOUND_POOL][cUSDC] = 2;
        AMMWrapperStorage.getStorage().curveSupportGetDx[CURVE_COMPOUND_POOL] = true; // support get_dx or get_dx_underlying for quoting
        // register USDT pool
        // underlying_coins, exchange_underlying
        AMMWrapperStorage.getStorage().curveTokenIndexes[CURVE_USDT_POOL][DAI] = 1;
        AMMWrapperStorage.getStorage().curveTokenIndexes[CURVE_USDT_POOL][USDC] = 2;
        AMMWrapperStorage.getStorage().curveTokenIndexes[CURVE_USDT_POOL][USDT] = 3;
        // coins, exchange
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_USDT_POOL][cDAI] = 1;
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_USDT_POOL][cUSDC] = 2;
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_USDT_POOL][USDT] = 3;
        AMMWrapperStorage.getStorage().curveSupportGetDx[CURVE_USDT_POOL] = true;
        // register Y pool
        // underlying_coins, exchange_underlying
        AMMWrapperStorage.getStorage().curveTokenIndexes[CURVE_Y_POOL][DAI] = 1;
        AMMWrapperStorage.getStorage().curveTokenIndexes[CURVE_Y_POOL][USDC] = 2;
        AMMWrapperStorage.getStorage().curveTokenIndexes[CURVE_Y_POOL][USDT] = 3;
        AMMWrapperStorage.getStorage().curveTokenIndexes[CURVE_Y_POOL][TUSD] = 4;
        // coins, exchange
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_Y_POOL][Y_POOL_yDAI] = 1;
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_Y_POOL][Y_POOL_yUSDC] = 2;
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_Y_POOL][Y_POOL_yUSDT] = 3;
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_Y_POOL][Y_POOL_yTUSD] = 4;
        AMMWrapperStorage.getStorage().curveSupportGetDx[CURVE_Y_POOL] = true;
        // register 3 pool
        // coins, exchange
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_3_POOL][DAI] = 1;
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_3_POOL][USDC] = 2;
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_3_POOL][USDT] = 3;
        AMMWrapperStorage.getStorage().curveSupportGetDx[CURVE_3_POOL] = false; // only support get_dy and get_dy_underlying for exactly the same functionality
        // register sUSD pool
        // coins, exchange
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_sUSD_POOL][DAI] = 1;
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_sUSD_POOL][USDC] = 2;
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_sUSD_POOL][USDT] = 3;
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_sUSD_POOL][sUSD] = 4;
        AMMWrapperStorage.getStorage().curveSupportGetDx[CURVE_sUSD_POOL] = false;
        // register BUSD pool
        // underlying_coins, exchange_underlying
        AMMWrapperStorage.getStorage().curveTokenIndexes[CURVE_BUSD_POOL][DAI] = 1;
        AMMWrapperStorage.getStorage().curveTokenIndexes[CURVE_BUSD_POOL][USDC] = 2;
        AMMWrapperStorage.getStorage().curveTokenIndexes[CURVE_BUSD_POOL][USDT] = 3;
        AMMWrapperStorage.getStorage().curveTokenIndexes[CURVE_BUSD_POOL][BUSD] = 4;
        // coins, exchange
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_BUSD_POOL][BUSD_POOL_yDAI] = 1;
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_BUSD_POOL][BUSD_POOL_yUSDC] = 2;
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_BUSD_POOL][BUSD_POOL_yUSDT] = 3;
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_BUSD_POOL][BUSD_POOL_yBUSD] = 4;
        AMMWrapperStorage.getStorage().curveSupportGetDx[CURVE_BUSD_POOL] = true;
        // register renBTC pool
        // coins, exchange
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_renBTC_POOL][renBTC] = 1; // renBTC
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_renBTC_POOL][wBTC] = 2; // wBTC
        AMMWrapperStorage.getStorage().curveSupportGetDx[CURVE_renBTC_POOL] = false;
        // register sBTC pool
        // coins, exchange
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_sBTC_POOL][renBTC] = 1; // renBTC
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_sBTC_POOL][wBTC] = 2; // wBTC
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_sBTC_POOL][sBTC] = 3; // sBTC
        AMMWrapperStorage.getStorage().curveSupportGetDx[CURVE_sBTC_POOL] = false;
        // register hBTC pool
        // coins, exchange
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_hBTC_POOL][hBTC] = 1; // hBTC
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_hBTC_POOL][wBTC] = 2; // wBTC
        AMMWrapperStorage.getStorage().curveSupportGetDx[CURVE_hBTC_POOL] = false;
        // register sETH pool
        // coins, exchange
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_sETH_POOL][ETH] = 1; // ETH
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_sETH_POOL][sETH] = 2; // sETH
        AMMWrapperStorage.getStorage().curveSupportGetDx[CURVE_sETH_POOL] = false;
    }
    /************************************************************
    *                     Getter functions                      *
    *************************************************************/
    function ammWrapperAddr() public view returns (address) {
        return PSStorage.getStorage().ammWrapperAddr;
    }
    function pmmAddr() public view returns (address) {
        return PSStorage.getStorage().pmmAddr;
    }
    function rfqAddr() public view returns (address) {
        return PSStorage.getStorage().rfqAddr;
    }
    function wethAddr() override external view returns (address) {
        return PSStorage.getStorage().wethAddr;
    }
    function getCurvePoolInfo(address _makerAddr, address _takerAssetAddr, address _makerAssetAddr) override external view returns (int128 takerAssetIndex, int128 makerAssetIndex, uint16 swapMethod, bool supportGetDx) {
        // underlying_coins
        int128 i = AMMWrapperStorage.getStorage().curveTokenIndexes[_makerAddr][_takerAssetAddr];
        int128 j = AMMWrapperStorage.getStorage().curveTokenIndexes[_makerAddr][_makerAssetAddr];
        supportGetDx = AMMWrapperStorage.getStorage().curveSupportGetDx[_makerAddr];
        swapMethod = 0;
        if (i != 0 && j != 0) {
            // in underlying_coins list
            takerAssetIndex = i;
            makerAssetIndex = j;
            // exchange_underlying
            swapMethod = 2;
        } else {
            // in coins list
            int128 iWrapped = AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[_makerAddr][_takerAssetAddr];
            int128 jWrapped = AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[_makerAddr][_makerAssetAddr];
            if (iWrapped != 0 && jWrapped != 0) {
                takerAssetIndex = iWrapped;
                makerAssetIndex = jWrapped;
                // exchange
                swapMethod = 1;
            } else {
                revert("PermanentStorage: invalid pair");
            }
        }
        return (takerAssetIndex, makerAssetIndex, swapMethod, supportGetDx);
    }
    function isTransactionSeen(bytes32 _transactionHash) override external view returns (bool) {
        return AMMWrapperStorage.getStorage().transactionSeen[_transactionHash];
    }
    function isAMMTransactionSeen(bytes32 _transactionHash) override external view returns (bool) {
        return AMMWrapperStorage.getStorage().transactionSeen[_transactionHash];
    }
    function isRFQTransactionSeen(bytes32 _transactionHash) override external view returns (bool) {
        return RFQStorage.getStorage().transactionSeen[_transactionHash];
    }
    function isRelayerValid(address _relayer) override external view returns (bool) {
        return AMMWrapperStorage.getStorage().relayerValid[_relayer];
    }
    /************************************************************
    *           Management functions for Operator               *
    *************************************************************/
    /// @dev Update AMMWrapper contract address.
    function upgradeAMMWrapper(address _newAMMWrapper) external {
        PSStorage.getStorage().ammWrapperAddr = _newAMMWrapper;
    }
    /// @dev Update PMM contract address.
    function upgradePMM(address _newPMM) external {
        PSStorage.getStorage().pmmAddr = _newPMM;
    }
    /// @dev Update RFQ contract address.
    function upgradeRFQ(address _newRFQ) external {
        PSStorage.getStorage().rfqAddr = _newRFQ;
    }
    /// @dev Update WETH contract address.
    function upgradeWETH(address _newWETH) external {
        PSStorage.getStorage().wethAddr = _newWETH;
    }
    /************************************************************
    *                   External functions                      *
    *************************************************************/
    function setCurvePoolInfo(address _makerAddr, address[] calldata _underlyingCoins, address[] calldata _coins, bool _supportGetDx) override external {
        int128 underlyingCoinsLength = int128(_underlyingCoins.length);
        for (int128 i = 0 ; i < underlyingCoinsLength; i++) {
            address assetAddr = _underlyingCoins[uint256(i)];
            // underlying coins for original DAI, USDC, TUSD
            AMMWrapperStorage.getStorage().curveTokenIndexes[_makerAddr][assetAddr] = i + 1;
        }
        int128 coinsLength = int128(_coins.length);
        for (int128 i = 0 ; i < coinsLength; i++) {
            address assetAddr = _coins[uint256(i)];
            // wrapped coins for cDAI, cUSDC, yDAI, yUSDC, yTUSD, yBUSD
            AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[_makerAddr][assetAddr] = i + 1;
        }
        AMMWrapperStorage.getStorage().curveSupportGetDx[_makerAddr] = _supportGetDx;
    }
    function setTransactionSeen(bytes32 _transactionHash) override external {
        require(!AMMWrapperStorage.getStorage().transactionSeen[_transactionHash], "PermanentStorage: transaction seen before");
        AMMWrapperStorage.getStorage().transactionSeen[_transactionHash] = true;
    }
    function setAMMTransactionSeen(bytes32 _transactionHash) override external {
        require(!AMMWrapperStorage.getStorage().transactionSeen[_transactionHash], "PermanentStorage: transaction seen before");
        AMMWrapperStorage.getStorage().transactionSeen[_transactionHash] = true;
    }
    function setRFQTransactionSeen(bytes32 _transactionHash) override external {
        require(!RFQStorage.getStorage().transactionSeen[_transactionHash], "PermanentStorage: transaction seen before");
        RFQStorage.getStorage().transactionSeen[_transactionHash] = true;
    }
    function setRelayersValid(address[] calldata _relayers, bool[] calldata _isValids) override external {
        require(_relayers.length == _isValids.length, "PermanentStorage: inputs length mismatch");
        for (uint256 i = 0; i < _relayers.length; i++) {
            AMMWrapperStorage.getStorage().relayerValid[_relayers[i]] = _isValids[i];
        }
    }
}
pragma solidity ^0.6.5;
pragma experimental ABIEncoderV2;
library PSStorage {
    bytes32 private constant STORAGE_SLOT = 0x92dd52b981a2dd69af37d8a3febca29ed6a974aede38ae66e4ef773173aba471;
    struct Storage {
        address ammWrapperAddr;
        address pmmAddr;
        address wethAddr;
        address rfqAddr;
    }
    /// @dev Get the storage bucket for this contract.
    function getStorage() internal pure returns (Storage storage stor) {
        assert(STORAGE_SLOT == bytes32(uint256(keccak256("permanent.storage.storage")) - 1));
        bytes32 slot = STORAGE_SLOT;
        // Dip into assembly to change the slot pointed to by the local
        // variable `stor`.
        // See https://solidity.readthedocs.io/en/v0.6.8/assembly.html?highlight=slot#access-to-external-variables-functions-and-libraries
        assembly { stor_slot := slot }
    }
}
library AMMWrapperStorage {
    bytes32 private constant STORAGE_SLOT = 0xd38d862c9fa97c2fa857a46e08022d272a3579c114ca4f335f1e5fcb692c045e;
    struct Storage {
        mapping(bytes32 => bool) transactionSeen;
        // curve pool => underlying token address => underlying token index
        mapping(address => mapping(address => int128)) curveTokenIndexes;
        mapping(address => bool) relayerValid;
        // 5.1.0 appended storage
        // curve pool => wrapped token address => wrapped token index
        mapping(address => mapping(address => int128)) curveWrappedTokenIndexes;
        mapping(address => bool) curveSupportGetDx;
    }
    /// @dev Get the storage bucket for this contract.
    function getStorage() internal pure returns (Storage storage stor) {
        assert(STORAGE_SLOT == bytes32(uint256(keccak256("permanent.ammwrapper.storage")) - 1));
        bytes32 slot = STORAGE_SLOT;
        // Dip into assembly to change the slot pointed to by the local
        // variable `stor`.
        // See https://solidity.readthedocs.io/en/v0.6.8/assembly.html?highlight=slot#access-to-external-variables-functions-and-libraries
        assembly { stor_slot := slot }
    }
}
library RFQStorage {
    bytes32 private constant STORAGE_SLOT = 0x9174e76494cfb023ddc1eb0effb6c12e107165382bbd0ecfddbc38ea108bbe52;
    struct Storage {
        mapping(bytes32 => bool) transactionSeen;
    }
    /// @dev Get the storage bucket for this contract.
    function getStorage() internal pure returns (Storage storage stor) {
        assert(STORAGE_SLOT == bytes32(uint256(keccak256("permanent.rfq.storage")) - 1));
        bytes32 slot = STORAGE_SLOT;
        // Dip into assembly to change the slot pointed to by the local
        // variable `stor`.
        // See https://solidity.readthedocs.io/en/v0.6.8/assembly.html?highlight=slot#access-to-external-variables-functions-and-libraries
        assembly { stor_slot := slot }
    }
}// SPDX-License-Identifier: MIT
pragma solidity ^0.6.5;
import "./interfaces/IPermanentStorage.sol";
import "./utils/lib_storage/PSStorage.sol";
contract PermanentStorage is IPermanentStorage {
    // Constants do not have storage slot.
    bytes32 public constant curveTokenIndexStorageId = 0xf4c750cdce673f6c35898d215e519b86e3846b1f0532fb48b84fe9d80f6de2fc; // keccak256("curveTokenIndex")
    bytes32 public constant transactionSeenStorageId = 0x695d523b8578c6379a2121164fd8de334b9c5b6b36dff5408bd4051a6b1704d0;  // keccak256("transactionSeen")
    bytes32 public constant relayerValidStorageId = 0x2c97779b4deaf24e9d46e02ec2699240a957d92782b51165b93878b09dd66f61;  // keccak256("relayerValid")
    // New supported Curve pools
    address public constant CURVE_renBTC_POOL = 0x93054188d876f558f4a66B2EF1d97d16eDf0895B;
    address public constant CURVE_sBTC_POOL = 0x7fC77b5c7614E1533320Ea6DDc2Eb61fa00A9714;
    address public constant CURVE_hBTC_POOL = 0x4CA9b3063Ec5866A4B82E437059D2C43d1be596F;
    address public constant CURVE_sETH_POOL = 0xc5424B857f758E906013F3555Dad202e4bdB4567;
    // Curve coins
    address private constant ETH = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    address private constant renBTC = 0xEB4C2781e4ebA804CE9a9803C67d0893436bB27D;
    address private constant wBTC = 0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599;
    address private constant sBTC = 0xfE18be6b3Bd88A2D2A7f928d00292E7a9963CfC6;
    address private constant hBTC = 0x0316EB71485b0Ab14103307bf65a021042c6d380;
    address private constant sETH = 0x5e74C9036fb86BD7eCdcb084a0673EFc32eA31cb;
    // Below are the variables which consume storage slots.
    address public operator;
    string public version;  // Current version of the contract
    mapping(bytes32 => mapping(address => bool)) private permission;
    // Operator events
    event TransferOwnership(address newOperator);
    event SetPermission(bytes32 storageId, address role, bool enabled);
    event UpgradeAMMWrapper(address newAMMWrapper);
    event UpgradePMM(address newPMM);
    event UpgradeRFQ(address newRFQ);
    event UpgradeWETH(address newWETH);
    /************************************************************
    *          Access control and ownership management          *
    *************************************************************/
    modifier onlyOperator() {
        require(operator == msg.sender, "PermanentStorage: not the operator");
        _;
    }
    modifier validRole(bool _enabled, address _role) {
        if (_enabled) {
            require(
                (_role == operator) || (_role == ammWrapperAddr()) || (_role == pmmAddr() || (_role == rfqAddr())),
                "PermanentStorage: not a valid role"
            );
        }
        _;
    }
    modifier isPermitted(bytes32 _storageId, address _role) {
        require(permission[_storageId][_role], "PermanentStorage: has no permission");
        _;
    }
    function transferOwnership(address _newOperator) external onlyOperator {
        require(_newOperator != address(0), "PermanentStorage: operator can not be zero address");
        operator = _newOperator;
        emit TransferOwnership(_newOperator);
    }
    /// @dev Set permission for entity to write certain storage.
    function setPermission(bytes32 _storageId, address _role, bool _enabled) external onlyOperator validRole(_enabled, _role) {
        permission[_storageId][_role] = _enabled;
        emit SetPermission(_storageId, _role, _enabled);
    }
    /************************************************************
    *              Constructor and init functions               *
    *************************************************************/
    /// @dev Replacing constructor and initialize the contract. This function should only be called once.
    function initialize() external {
        require(
            keccak256(abi.encodePacked(version)) == keccak256(abi.encodePacked("5.1.0")),
            "PermanentStorage: not upgrading from 5.1.0 version"
        );
        // upgrade from 5.1.0 to 5.2.0
        version = "5.2.0";
        // register renBTC pool
        // coins, exchange
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_renBTC_POOL][renBTC] = 1; // renBTC
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_renBTC_POOL][wBTC] = 2; // wBTC
        AMMWrapperStorage.getStorage().curveSupportGetDx[CURVE_renBTC_POOL] = false;
        // register sBTC pool
        // coins, exchange
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_sBTC_POOL][renBTC] = 1; // renBTC
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_sBTC_POOL][wBTC] = 2; // wBTC
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_sBTC_POOL][sBTC] = 3; // sBTC
        AMMWrapperStorage.getStorage().curveSupportGetDx[CURVE_sBTC_POOL] = false;
        // register hBTC pool
        // coins, exchange
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_hBTC_POOL][hBTC] = 1; // hBTC
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_hBTC_POOL][wBTC] = 2; // wBTC
        AMMWrapperStorage.getStorage().curveSupportGetDx[CURVE_hBTC_POOL] = false;
        // register sETH pool
        // coins, exchange
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_sETH_POOL][ETH] = 1; // ETH
        AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[CURVE_sETH_POOL][sETH] = 2; // sETH
        AMMWrapperStorage.getStorage().curveSupportGetDx[CURVE_sETH_POOL] = false;
    }
    /************************************************************
    *                     Getter functions                      *
    *************************************************************/
    function hasPermission(bytes32 _storageId, address _role) external view returns (bool) {
        return permission[_storageId][_role];
    }
    function ammWrapperAddr() public view returns (address) {
        return PSStorage.getStorage().ammWrapperAddr;
    }
    function pmmAddr() public view returns (address) {
        return PSStorage.getStorage().pmmAddr;
    }
    function rfqAddr() public view returns (address) {
        return PSStorage.getStorage().rfqAddr;
    }
    function wethAddr() override external view returns (address) {
        return PSStorage.getStorage().wethAddr;
    }
    function getCurvePoolInfo(address _makerAddr, address _takerAssetAddr, address _makerAssetAddr) override external view returns (int128 takerAssetIndex, int128 makerAssetIndex, uint16 swapMethod, bool supportGetDx) {
        // underlying_coins
        int128 i = AMMWrapperStorage.getStorage().curveTokenIndexes[_makerAddr][_takerAssetAddr];
        int128 j = AMMWrapperStorage.getStorage().curveTokenIndexes[_makerAddr][_makerAssetAddr];
        supportGetDx = AMMWrapperStorage.getStorage().curveSupportGetDx[_makerAddr];
        swapMethod = 0;
        if (i != 0 && j != 0) {
            // in underlying_coins list
            takerAssetIndex = i;
            makerAssetIndex = j;
            // exchange_underlying
            swapMethod = 2;
        } else {
            // in coins list
            int128 iWrapped = AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[_makerAddr][_takerAssetAddr];
            int128 jWrapped = AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[_makerAddr][_makerAssetAddr];
            if (iWrapped != 0 && jWrapped != 0) {
                takerAssetIndex = iWrapped;
                makerAssetIndex = jWrapped;
                // exchange
                swapMethod = 1;
            } else {
                revert("PermanentStorage: invalid pair");
            }
        }
        return (takerAssetIndex, makerAssetIndex, swapMethod, supportGetDx);
    }
    /* 
    NOTE: `isTransactionSeen` is replaced by `isAMMTransactionSeen`. It is kept for backward compatability.
    It should be removed from AMM 5.2.1 upward.
    */
    function isTransactionSeen(bytes32 _transactionHash) override external view returns (bool) {
        return AMMWrapperStorage.getStorage().transactionSeen[_transactionHash];
    }
    function isAMMTransactionSeen(bytes32 _transactionHash) override external view returns (bool) {
        return AMMWrapperStorage.getStorage().transactionSeen[_transactionHash];
    }
    function isRFQTransactionSeen(bytes32 _transactionHash) override external view returns (bool) {
        return RFQStorage.getStorage().transactionSeen[_transactionHash];
    }
    function isRelayerValid(address _relayer) override external view returns (bool) {
        return AMMWrapperStorage.getStorage().relayerValid[_relayer];
    }
    /************************************************************
    *           Management functions for Operator               *
    *************************************************************/
    /// @dev Update AMMWrapper contract address.
    function upgradeAMMWrapper(address _newAMMWrapper) external onlyOperator {
        PSStorage.getStorage().ammWrapperAddr = _newAMMWrapper;
        emit UpgradeAMMWrapper(_newAMMWrapper);
    }
    /// @dev Update PMM contract address.
    function upgradePMM(address _newPMM) external onlyOperator {
        PSStorage.getStorage().pmmAddr = _newPMM;
        emit UpgradePMM(_newPMM);
    }
    /// @dev Update RFQ contract address.
    function upgradeRFQ(address _newRFQ) external onlyOperator {
        PSStorage.getStorage().rfqAddr = _newRFQ;
        emit UpgradeRFQ(_newRFQ);
    }
    /// @dev Update WETH contract address.
    function upgradeWETH(address _newWETH) external onlyOperator {
        PSStorage.getStorage().wethAddr = _newWETH;
        emit UpgradeWETH(_newWETH);
    }
    /************************************************************
    *                   External functions                      *
    *************************************************************/
    function setCurvePoolInfo(address _makerAddr, address[] calldata _underlyingCoins, address[] calldata _coins, bool _supportGetDx) override external isPermitted(curveTokenIndexStorageId, msg.sender) {
        int128 underlyingCoinsLength = int128(_underlyingCoins.length);
        for (int128 i = 0 ; i < underlyingCoinsLength; i++) {
            address assetAddr = _underlyingCoins[uint256(i)];
            // underlying coins for original DAI, USDC, TUSD
            AMMWrapperStorage.getStorage().curveTokenIndexes[_makerAddr][assetAddr] = i + 1;  // Start the index from 1
        }
        int128 coinsLength = int128(_coins.length);
        for (int128 i = 0 ; i < coinsLength; i++) {
            address assetAddr = _coins[uint256(i)];
            // wrapped coins for cDAI, cUSDC, yDAI, yUSDC, yTUSD, yBUSD
            AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[_makerAddr][assetAddr] = i + 1;  // Start the index from 1
        }
        AMMWrapperStorage.getStorage().curveSupportGetDx[_makerAddr] = _supportGetDx;
    }
    /* 
    NOTE: `setTransactionSeen` is replaced by `setAMMTransactionSeen`. It is kept for backward compatability.
    It should be removed from AMM 5.2.1 upward.
    */
    function setTransactionSeen(bytes32 _transactionHash) override external isPermitted(transactionSeenStorageId, msg.sender) {
        require(!AMMWrapperStorage.getStorage().transactionSeen[_transactionHash], "PermanentStorage: transaction seen before");
        AMMWrapperStorage.getStorage().transactionSeen[_transactionHash] = true;
    }
    function setAMMTransactionSeen(bytes32 _transactionHash) override external isPermitted(transactionSeenStorageId, msg.sender) {
        require(!AMMWrapperStorage.getStorage().transactionSeen[_transactionHash], "PermanentStorage: transaction seen before");
        AMMWrapperStorage.getStorage().transactionSeen[_transactionHash] = true;
    }
    function setRFQTransactionSeen(bytes32 _transactionHash) override external isPermitted(transactionSeenStorageId, msg.sender) {
        require(!RFQStorage.getStorage().transactionSeen[_transactionHash], "PermanentStorage: transaction seen before");
        RFQStorage.getStorage().transactionSeen[_transactionHash] = true;
    }
    function setRelayersValid(address[] calldata _relayers, bool[] calldata _isValids) override external isPermitted(relayerValidStorageId, msg.sender) {
        require(_relayers.length == _isValids.length, "PermanentStorage: inputs length mismatch");
        for (uint256 i = 0; i < _relayers.length; i++) {
            AMMWrapperStorage.getStorage().relayerValid[_relayers[i]] = _isValids[i];
        }
    }
}
pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "./AMMWrapper.sol";
import "./interfaces/ISpender.sol";
import "./interfaces/IUniswapRouterV2.sol";
import "./interfaces/IUniswapV3SwapRouter.sol";
import "./interfaces/IPermanentStorage.sol";
import "./utils/UniswapV3PathLib.sol";
contract AMMWrapperWithPath is AMMWrapper {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    using Path for bytes;
    // Constants do not have storage slot.
    address public constant UNISWAP_V3_ROUTER_ADDRESS = 0xE592427A0AEce92De3Edee1F18E0157C05861564;
    event Swapped(
        TxMetaData,
        Order order
    );
    /************************************************************
    *              Constructor and init functions               *
    *************************************************************/
    constructor (
        address _operator,
        uint256 _subsidyFactor,
        address _userProxy,
        ISpender _spender,
        IPermanentStorage _permStorage,
        IWETH _weth
    ) public AMMWrapper(_operator, _subsidyFactor, _userProxy, _spender, _permStorage, _weth) {}
    /************************************************************
    *                   External functions                      *
    *************************************************************/
    function trade(
        Order memory _order,
        uint256 _feeFactor,
        bytes calldata _sig,
        bytes calldata _makerSpecificData,
        address[] calldata _path
    )
        payable
        external
        nonReentrant
        onlyUserProxy
        returns (uint256) 
    {
        require(_order.deadline >= block.timestamp, "AMMWrapper: expired order");
        TxMetaData memory txMetaData;
        InternalTxData memory internalTxData;
        // These variables are copied straight from function parameters and
        // used to bypass stack too deep error.
        txMetaData.subsidyFactor = uint16(subsidyFactor);
        txMetaData.feeFactor = uint16(_feeFactor);
        internalTxData.makerSpecificData = _makerSpecificData;
        internalTxData.path = _path;
        if (! permStorage.isRelayerValid(tx.origin)) {
            txMetaData.feeFactor = (txMetaData.subsidyFactor > txMetaData.feeFactor) ? txMetaData.subsidyFactor : txMetaData.feeFactor;
            txMetaData.subsidyFactor = 0;
        }
        // Assign trade vairables
        internalTxData.fromEth = (_order.takerAssetAddr == ZERO_ADDRESS || _order.takerAssetAddr == ETH_ADDRESS);
        internalTxData.toEth = (_order.makerAssetAddr == ZERO_ADDRESS || _order.makerAssetAddr == ETH_ADDRESS);
        if(_isCurve(_order.makerAddr)) {
            // PermanetStorage can recognize `ETH_ADDRESS` but not `ZERO_ADDRESS`.
            // Convert it to `ETH_ADDRESS` as passed in `_order.takerAssetAddr` or `_order.makerAssetAddr` might be `ZERO_ADDRESS`.
            internalTxData.takerAssetInternalAddr = internalTxData.fromEth ? ETH_ADDRESS : _order.takerAssetAddr;
            internalTxData.makerAssetInternalAddr = internalTxData.toEth ? ETH_ADDRESS : _order.makerAssetAddr;
        } else {
            internalTxData.takerAssetInternalAddr = internalTxData.fromEth ? address(weth) : _order.takerAssetAddr;
            internalTxData.makerAssetInternalAddr = internalTxData.toEth ? address(weth) : _order.makerAssetAddr;
        }
        txMetaData.transactionHash = _verify(
            _order,
            _sig
        );
        _prepare(_order, internalTxData);
        (txMetaData.source, txMetaData.receivedAmount) = _swapWithPath(
            _order,
            txMetaData,
            internalTxData
        );
        // Settle
        txMetaData.settleAmount = _settle(
            _order,
            txMetaData,
            internalTxData
        );
        emit Swapped(
            txMetaData,
            _order
        );
        return txMetaData.settleAmount;
    }
    /**
     * @dev internal function of `trade`.
     * Used to tell if maker is Curve.
     */
    function _isCurve(address _makerAddr) override internal pure returns (bool) {
        if (
            _makerAddr == UNISWAP_V2_ROUTER_02_ADDRESS ||
            _makerAddr == UNISWAP_V3_ROUTER_ADDRESS ||
            _makerAddr == SUSHISWAP_ROUTER_ADDRESS
        ) return false;
        else return true;
    }
    /**
     * @dev internal function of `trade`.
     * It executes the swap on chosen AMM.
     */
    function _swapWithPath(
        Order memory _order,
        TxMetaData memory _txMetaData,
        InternalTxData memory _internalTxData
    )
        internal
        approveTakerAsset(_internalTxData.takerAssetInternalAddr, _order.makerAddr)
        returns (string memory source, uint256 receivedAmount)
    {
        // Swap
        // minAmount = makerAssetAmount * (10000 - subsidyFactor) / 10000
        uint256 minAmount = _order.makerAssetAmount.mul((BPS_MAX.sub(_txMetaData.subsidyFactor))).div(BPS_MAX);
        if (_order.makerAddr == UNISWAP_V2_ROUTER_02_ADDRESS ||
            _order.makerAddr == SUSHISWAP_ROUTER_ADDRESS) {
            source = (_order.makerAddr == SUSHISWAP_ROUTER_ADDRESS) ? "SushiSwap" : "Uniswap V2";
            // Sushiswap shares the same interface as Uniswap's
            receivedAmount = _tradeUniswapV2TokenToToken(
                _order.makerAddr,
                _internalTxData.takerAssetInternalAddr,
                _internalTxData.makerAssetInternalAddr,
                _order.takerAssetAmount,
                minAmount,
                _order.deadline,
                _internalTxData.path
            );
        } else if (_order.makerAddr == UNISWAP_V3_ROUTER_ADDRESS) {
            source = "Uniswap V3";
            receivedAmount = _tradeUniswapV3TokenToToken(
                _order.makerAddr,
                _internalTxData.takerAssetInternalAddr,
                _internalTxData.makerAssetInternalAddr,
                _order.deadline,
                _order.takerAssetAmount,
                minAmount,
                _internalTxData.makerSpecificData
            );
        } else {
            CurveData memory curveData;
            (
                curveData.fromTokenCurveIndex,
                curveData.toTokenCurveIndex,
                curveData.swapMethod,
            ) = permStorage.getCurvePoolInfo(
                _order.makerAddr,
                _internalTxData.takerAssetInternalAddr,
                _internalTxData.makerAssetInternalAddr
            );
            require(curveData.swapMethod != 0,"AMMWrapper: swap method not registered");
            if (curveData.fromTokenCurveIndex > 0 && curveData.toTokenCurveIndex > 0) {
                source = "Curve";
                // Substract index by 1 because indices stored in `permStorage` starts from 1
                curveData.fromTokenCurveIndex = curveData.fromTokenCurveIndex - 1;
                curveData.toTokenCurveIndex = curveData.toTokenCurveIndex - 1;
                // Curve does not return amount swapped so we need to record balance change instead.
                uint256 balanceBeforeTrade = _getSelfBalance(_internalTxData.makerAssetInternalAddr);
                _tradeCurveTokenToToken(
                    _order.makerAddr,
                    curveData.fromTokenCurveIndex,
                    curveData.toTokenCurveIndex,
                    _order.takerAssetAmount,
                    minAmount,
                    curveData.swapMethod
                );
                uint256 balanceAfterTrade = _getSelfBalance(_internalTxData.makerAssetInternalAddr);
                receivedAmount = balanceAfterTrade.sub(balanceBeforeTrade);
            } else {
                revert("AMMWrapper: unsupported makerAddr");
            }
        }
    }
    function _tradeUniswapV2TokenToToken(
        address _makerAddr,
        address _takerAssetAddr,
        address _makerAssetAddr,
        uint256 _takerAssetAmount,
        uint256 _makerAssetAmount,
        uint256 _deadline,
        address[] memory _path
    )
        internal 
        returns (uint256) 
    {
        IUniswapRouterV2 router = IUniswapRouterV2(_makerAddr);
        if (_path.length == 0) {
            _path = new address[](2);
            _path[0] = _takerAssetAddr;
            _path[1] = _makerAssetAddr;
        } else {
            require(_path.length >= 2, "AMMWrapper: path length must be at least two");
            require(_path[0] == _takerAssetAddr, "AMMWrapper: first element of path must match taker asset");
            require(_path[_path.length - 1] == _makerAssetAddr, "AMMWrapper: last element of path must match maker asset");
        }
        uint256[] memory amounts = router.swapExactTokensForTokens(
            _takerAssetAmount,
            _makerAssetAmount,
            _path,
            address(this),
            _deadline
        );
        return amounts[amounts.length - 1];
    }
    function _validateUniswapV3Path(
        bytes memory _path,
        address _takerAssetAddr,
        address _makerAssetAddr
    ) internal {
        (address tokenA, address tokenB, ) = _path.decodeFirstPool();
        if (_path.hasMultiplePools()) {
            _path = _path.skipToken();
            while (_path.hasMultiplePools()) {
                _path = _path.skipToken();
            }
            (, tokenB, ) = _path.decodeFirstPool();
        }
        require(tokenA == _takerAssetAddr, "AMMWrapper: first element of path must match taker asset");
        require(tokenB == _makerAssetAddr, "AMMWrapper: last element of path must match maker asset");
    }
    function _tradeUniswapV3TokenToToken(
        address _makerAddr,
        address _takerAssetAddr,
        address _makerAssetAddr,
        uint256 _deadline,
        uint256 _takerAssetAmount,
        uint256 _makerAssetAmount,
        bytes memory _makerSpecificData
    )
        internal 
        returns (uint256 amountOut) 
    {
        ISwapRouter router = ISwapRouter(_makerAddr);
        // swapType:
        // 1: exactInputSingle, 2: exactInput
        uint8 swapType = uint8(uint256(_makerSpecificData.readBytes32(0)));
        if (swapType == 1) {
            (, uint24 poolFee) = abi.decode(_makerSpecificData, (uint8, uint24));
            ISwapRouter.ExactInputSingleParams memory exactInputSingleParams;
            exactInputSingleParams.tokenIn = _takerAssetAddr;
            exactInputSingleParams.tokenOut = _makerAssetAddr;
            exactInputSingleParams.fee = poolFee;
            exactInputSingleParams.recipient = address(this);
            exactInputSingleParams.deadline = _deadline;
            exactInputSingleParams.amountIn = _takerAssetAmount;
            exactInputSingleParams.amountOutMinimum = _makerAssetAmount;
            exactInputSingleParams.sqrtPriceLimitX96 = 0;
            amountOut = router.exactInputSingle(exactInputSingleParams);
        } else if (swapType == 2) {
            (, bytes memory path) = abi.decode(_makerSpecificData, (uint8, bytes));
            _validateUniswapV3Path(path, _takerAssetAddr, _makerAssetAddr);
            ISwapRouter.ExactInputParams memory exactInputParams;
            exactInputParams.path = path;
            exactInputParams.recipient = address(this);
            exactInputParams.deadline = _deadline;
            exactInputParams.amountIn = _takerAssetAmount;
            exactInputParams.amountOutMinimum = _makerAssetAmount;
            amountOut = router.exactInput(exactInputParams);
        } else {
            revert("AMMWrapper: unsupported UniswapV3 swap type");
        }
    }
}
pragma solidity ^0.6.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "./interfaces/ISpender.sol";
import "./interfaces/IUniswapExchange.sol";
import "./interfaces/IUniswapFactory.sol";
import "./interfaces/IUniswapRouterV2.sol";
import "./interfaces/ICurveFi.sol";
import "./interfaces/IAMM.sol";
import "./interfaces/IWeth.sol";
import "./interfaces/IPermanentStorage.sol";
import "./utils/AMMLibEIP712.sol";
import "./utils/SignatureValidator.sol";
contract AMMWrapper is
    IAMM,
    ReentrancyGuard,
    AMMLibEIP712,
    SignatureValidator
{
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    // Constants do not have storage slot.
    string public constant version = "5.2.0";
    uint256 internal constant MAX_UINT = 2**256 - 1;
    uint256 internal constant BPS_MAX = 10000;
    address internal constant ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    address internal constant ZERO_ADDRESS = address(0);
    address public immutable userProxy;
    IWETH public immutable weth;
    IPermanentStorage public immutable permStorage;
    address public constant UNISWAP_V2_ROUTER_02_ADDRESS = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address public constant SUSHISWAP_ROUTER_ADDRESS = 0xd9e1cE17f2641f24aE83637ab66a2cca9C378B9F;
    // Below are the variables which consume storage slots.
    address public operator;
    uint256 public subsidyFactor;
    ISpender public spender;
    /* Struct and event declaration */
    // Group the local variables together to prevent
    // Compiler error: Stack too deep, try removing local variables.
    struct TxMetaData {
        string source;
        bytes32 transactionHash;
        uint256 settleAmount;
        uint256 receivedAmount;
        uint16 feeFactor;
        uint16 subsidyFactor;
    }
    struct InternalTxData {
        bool fromEth;
        bool toEth;
        address takerAssetInternalAddr;
        address makerAssetInternalAddr;
        address[] path;
        bytes makerSpecificData;
    }
    struct CurveData {
        int128 fromTokenCurveIndex;
        int128 toTokenCurveIndex;
        uint16 swapMethod;
    }
    // Operator events
    event TransferOwnership(address newOperator);
    event UpgradeSpender(address newSpender);
    event SetSubsidyFactor(uint256 newSubisdyFactor);
    event AllowTransfer(address spender);
    event DisallowTransfer(address spender);
    event DepositETH(uint256 ethBalance);
    event Swapped(
        string source,
        bytes32 indexed transactionHash,
        address indexed userAddr,
        address takerAssetAddr,
        uint256 takerAssetAmount,
        address makerAddr,
        address makerAssetAddr,
        uint256 makerAssetAmount,
        address receiverAddr,
        uint256 settleAmount,
        uint256 receivedAmount,
        uint16 feeFactor,
        uint16 subsidyFactor
    );
    receive() external payable {}
    /************************************************************
    *          Access control and ownership management          *
    *************************************************************/
    modifier onlyOperator() {
        require(operator == msg.sender, "AMMWrapper: not the operator");
        _;
    }
    modifier onlyUserProxy() {
        require(address(userProxy) == msg.sender, "AMMWrapper: not the UserProxy contract");
        _;
    }
    function transferOwnership(address _newOperator) external onlyOperator {
        require(_newOperator != address(0), "AMMWrapper: operator can not be zero address");
        operator = _newOperator;
        emit TransferOwnership(_newOperator);
    }
    /************************************************************
    *                 Internal function modifier                *
    *************************************************************/
    modifier approveTakerAsset(address _takerAssetInternalAddr, address _makerAddr) {
        bool isTakerAssetETH = _isInternalAssetETH(_takerAssetInternalAddr);
        if (! isTakerAssetETH) IERC20(_takerAssetInternalAddr).safeApprove(_makerAddr, MAX_UINT);
        _;
        if (! isTakerAssetETH) IERC20(_takerAssetInternalAddr).safeApprove(_makerAddr, 0);
    }
    /************************************************************
    *              Constructor and init functions               *
    *************************************************************/
    constructor (
        address _operator,
        uint256 _subsidyFactor,
        address _userProxy,
        ISpender _spender,
        IPermanentStorage _permStorage,
        IWETH _weth
    ) public {
        operator = _operator;
        subsidyFactor = _subsidyFactor;
        userProxy = _userProxy;
        spender = _spender;
        permStorage = _permStorage;
        weth = _weth;
    }
    /************************************************************
    *           Management functions for Operator               *
    *************************************************************/
    /**
     * @dev set new Spender
     */
    function upgradeSpender(address _newSpender) external onlyOperator {
        require(_newSpender != address(0), "AMMWrapper: spender can not be zero address");
        spender = ISpender(_newSpender);
        emit UpgradeSpender(_newSpender);
    }
    function setSubsidyFactor(uint256 _subsidyFactor) external onlyOperator {
        subsidyFactor = _subsidyFactor;
        emit SetSubsidyFactor(_subsidyFactor);
    }
    /**
     * @dev approve spender to transfer tokens from this contract. This is used to collect fee.
     */
    function setAllowance(address[] calldata _tokenList, address _spender) override external onlyOperator {
        for (uint256 i = 0 ; i < _tokenList.length; i++) {
            IERC20(_tokenList[i]).safeApprove(_spender, MAX_UINT);
            emit AllowTransfer(_spender);
        }
    }
    function closeAllowance(address[] calldata _tokenList, address _spender) override external onlyOperator {
        for (uint256 i = 0 ; i < _tokenList.length; i++) {
            IERC20(_tokenList[i]).safeApprove(_spender, 0);
            emit DisallowTransfer(_spender);
        }
    }
    /**
     * @dev convert collected ETH to WETH
     */
    function depositETH() external onlyOperator {
        uint256 balance = address(this).balance;
        if (balance > 0) {
            weth.deposit{value: balance}();
            emit DepositETH(balance);
        }
    }
    /************************************************************
    *                   External functions                      *
    *************************************************************/
    function trade(
        address _makerAddr,
        address _takerAssetAddr,
        address _makerAssetAddr,
        uint256 _takerAssetAmount,
        uint256 _makerAssetAmount,
        uint256 _feeFactor,
        address _userAddr,
        address payable _receiverAddr,
        uint256 _salt,
        uint256 _deadline,
        bytes calldata _sig
    )
        override
        payable
        external
        nonReentrant
        onlyUserProxy
        returns (uint256) 
    {
        Order memory order = Order(
            _makerAddr,
            _takerAssetAddr,
            _makerAssetAddr,
            _takerAssetAmount,
            _makerAssetAmount,
            _userAddr,
            _receiverAddr,
            _salt,
            _deadline
        );
        require(order.deadline >= block.timestamp, "AMMWrapper: expired order");
        TxMetaData memory txMetaData;
        InternalTxData memory internalTxData;
        // These variables are copied straight from function parameters and
        // used to bypass stack too deep error.
        txMetaData.subsidyFactor = uint16(subsidyFactor);
        txMetaData.feeFactor = uint16(_feeFactor);
        if (! permStorage.isRelayerValid(tx.origin)) {
            txMetaData.feeFactor = (txMetaData.subsidyFactor > txMetaData.feeFactor) ? txMetaData.subsidyFactor : txMetaData.feeFactor;
            txMetaData.subsidyFactor = 0;
        }
        // Assign trade vairables
        internalTxData.fromEth = (order.takerAssetAddr == ZERO_ADDRESS || order.takerAssetAddr == ETH_ADDRESS);
        internalTxData.toEth = (order.makerAssetAddr == ZERO_ADDRESS || order.makerAssetAddr == ETH_ADDRESS);
        if(_isCurve(order.makerAddr)) {
            // PermanetStorage can recognize `ETH_ADDRESS` but not `ZERO_ADDRESS`.
            // Convert it to `ETH_ADDRESS` as passed in `order.takerAssetAddr` or `order.makerAssetAddr` might be `ZERO_ADDRESS`.
            internalTxData.takerAssetInternalAddr = internalTxData.fromEth ? ETH_ADDRESS : order.takerAssetAddr;
            internalTxData.makerAssetInternalAddr = internalTxData.toEth ? ETH_ADDRESS : order.makerAssetAddr;
        } else {
            internalTxData.takerAssetInternalAddr = internalTxData.fromEth ? address(weth) : order.takerAssetAddr;
            internalTxData.makerAssetInternalAddr = internalTxData.toEth ? address(weth) : order.makerAssetAddr;
        }
        txMetaData.transactionHash = _verify(
            order,
            _sig
        );
        _prepare(order, internalTxData);
        (txMetaData.source, txMetaData.receivedAmount) = _swap(
            order,
            txMetaData,
            internalTxData
        );
        // Settle
        txMetaData.settleAmount = _settle(
            order,
            txMetaData,
            internalTxData
        );
        emit Swapped(
            txMetaData.source,
            txMetaData.transactionHash,
            order.userAddr,
            order.takerAssetAddr,
            order.takerAssetAmount,
            order.makerAddr,
            order.makerAssetAddr,
            order.makerAssetAmount,
            order.receiverAddr,
            txMetaData.settleAmount,
            txMetaData.receivedAmount,
            txMetaData.feeFactor,
            txMetaData.subsidyFactor
        );
        return txMetaData.settleAmount;
    }
    /**
     * @dev internal function of `trade`.
     * Used to tell if maker is Curve.
     */
    function _isCurve(address _makerAddr) virtual internal pure returns (bool) {
        if (
            _makerAddr == UNISWAP_V2_ROUTER_02_ADDRESS ||
            _makerAddr == SUSHISWAP_ROUTER_ADDRESS
        ) return false;
        else return true;
    }
    /**
     * @dev internal function of `trade`.
     * Used to tell if internal asset is ETH.
     */
    function _isInternalAssetETH(address _internalAssetAddr) internal pure returns (bool) {
        if (_internalAssetAddr == ETH_ADDRESS || _internalAssetAddr == ZERO_ADDRESS) return true;
        else return false;
    }
    /**
     * @dev internal function of `trade`.
     * Get this contract's eth balance or token balance.
     */
    function _getSelfBalance(address _makerAssetInternalAddr) internal view returns (uint256) {
        if (_isInternalAssetETH(_makerAssetInternalAddr)) {
            return address(this).balance;
        } else {
            return IERC20(_makerAssetInternalAddr).balanceOf(address(this));
        }
    }
    /**
     * @dev internal function of `trade`.
     * It verifies user signature and store tx hash to prevent replay attack.
     */
    function _verify(
        Order memory _order,
        bytes calldata _sig
    ) internal returns (bytes32 transactionHash) {
        // Verify user signature
        // TRADE_WITH_PERMIT_TYPEHASH = keccak256("tradeWithPermit(address makerAddr,address takerAssetAddr,address makerAssetAddr,uint256 takerAssetAmount,uint256 makerAssetAmount,address userAddr,address receiverAddr,uint256 salt,uint256 deadline)");
        transactionHash = keccak256(
            abi.encode(
                TRADE_WITH_PERMIT_TYPEHASH,
                _order.makerAddr,
                _order.takerAssetAddr,
                _order.makerAssetAddr,
                _order.takerAssetAmount,
                _order.makerAssetAmount,
                _order.userAddr,
                _order.receiverAddr,
                _order.salt,
                _order.deadline
            )
        );
        bytes32 EIP712SignDigest = keccak256(
            abi.encodePacked(
                EIP191_HEADER,
                EIP712_DOMAIN_SEPARATOR,
                transactionHash
            )
        );
        require(isValidSignature(_order.userAddr, EIP712SignDigest, bytes(""), _sig), "AMMWrapper: invalid user signature");
        // Set transaction as seen, PermanentStorage would throw error if transaction already seen.
        permStorage.setAMMTransactionSeen(transactionHash);
    }
    /**
     * @dev internal function of `trade`.
     * It executes the swap on chosen AMM.
     */
    function _prepare(Order memory _order, InternalTxData memory _internalTxData) internal {
        // Transfer asset from user and deposit to weth if needed
        if (_internalTxData.fromEth) {
            require(msg.value > 0, "AMMWrapper: msg.value is zero");
            require(_order.takerAssetAmount == msg.value, "AMMWrapper: msg.value doesn't match");
            // Deposit ETH to WETH if internal asset is WETH instead of ETH
            if (! _isInternalAssetETH(_internalTxData.takerAssetInternalAddr)) {
                weth.deposit{value: msg.value}();
            }
        } else {
            // other ERC20 tokens
            spender.spendFromUser(_order.userAddr, _order.takerAssetAddr, _order.takerAssetAmount);
        }
    }
    /**
     * @dev internal function of `trade`.
     * It executes the swap on chosen AMM.
     */
    function _swap(
        Order memory _order,
        TxMetaData memory _txMetaData,
        InternalTxData memory _internalTxData
    )
        internal
        approveTakerAsset(_internalTxData.takerAssetInternalAddr, _order.makerAddr)
        returns (string memory source, uint256 receivedAmount)
    {
        // Swap
        // minAmount = makerAssetAmount * (10000 - subsidyFactor) / 10000
        uint256 minAmount = _order.makerAssetAmount.mul((BPS_MAX.sub(_txMetaData.subsidyFactor))).div(BPS_MAX);
        if (_order.makerAddr == UNISWAP_V2_ROUTER_02_ADDRESS ||
            _order.makerAddr == SUSHISWAP_ROUTER_ADDRESS) {
            source = (_order.makerAddr == SUSHISWAP_ROUTER_ADDRESS) ? "SushiSwap" : "Uniswap V2";
            // Sushiswap shares the same interface as Uniswap's
            receivedAmount = _tradeUniswapV2TokenToToken(
                _order.makerAddr,
                _internalTxData.takerAssetInternalAddr,
                _internalTxData.makerAssetInternalAddr,
                _order.takerAssetAmount,
                minAmount,
                _order.deadline
            );
        } else {
            CurveData memory curveData;
            (
                curveData.fromTokenCurveIndex,
                curveData.toTokenCurveIndex,
                curveData.swapMethod,
            ) = permStorage.getCurvePoolInfo(
                _order.makerAddr,
                _internalTxData.takerAssetInternalAddr,
                _internalTxData.makerAssetInternalAddr
            );
            require(curveData.swapMethod != 0, "AMMWrapper: swap method not registered");
            if (curveData.fromTokenCurveIndex > 0 && curveData.toTokenCurveIndex > 0) {
                source = "Curve";
                // Substract index by 1 because indices stored in `permStorage` starts from 1
                curveData.fromTokenCurveIndex = curveData.fromTokenCurveIndex - 1;
                curveData.toTokenCurveIndex = curveData.toTokenCurveIndex - 1;
                // Curve does not return amount swapped so we need to record balance change instead.
                uint256 balanceBeforeTrade = _getSelfBalance(_internalTxData.makerAssetInternalAddr);
                _tradeCurveTokenToToken(
                    _order.makerAddr,
                    curveData.fromTokenCurveIndex,
                    curveData.toTokenCurveIndex,
                    _order.takerAssetAmount,
                    minAmount,
                    curveData.swapMethod
                );
                uint256 balanceAfterTrade = _getSelfBalance(_internalTxData.makerAssetInternalAddr);
                receivedAmount = balanceAfterTrade.sub(balanceBeforeTrade);
            } else {
                revert("AMMWrapper: unsupported makerAddr");
            }
        }
    }
    /**
     * @dev internal function of `trade`.
     * It collects fee from the trade or compensates the trade based on the actual amount swapped.
     */
    function _settle(
        Order memory _order,
        TxMetaData memory _txMetaData,
        InternalTxData memory _internalTxData
    )
        internal
        returns (uint256 settleAmount)
    {
        // Convert var type from uint16 to uint256
        uint256 _feeFactor = _txMetaData.feeFactor;
        uint256 _subsidyFactor = _txMetaData.subsidyFactor;
        if (_txMetaData.receivedAmount == _order.makerAssetAmount) {
            settleAmount = _txMetaData.receivedAmount;
        } else if (_txMetaData.receivedAmount > _order.makerAssetAmount) {
            // shouldCollectFee = ((receivedAmount - makerAssetAmount) / receivedAmount) > (feeFactor / 10000)
            bool shouldCollectFee = _txMetaData.receivedAmount.sub(_order.makerAssetAmount).mul(BPS_MAX) > _feeFactor.mul(_txMetaData.receivedAmount);
            if (shouldCollectFee) {
                // settleAmount = receivedAmount * (1 - feeFactor) / 10000
                settleAmount = _txMetaData.receivedAmount.mul(BPS_MAX.sub(_feeFactor)).div(BPS_MAX);
            } else {
                settleAmount = _order.makerAssetAmount;
            }
        } else {
            require(_subsidyFactor > 0, "AMMWrapper: this trade will not be subsidized");
            // If fee factor is smaller than subsidy factor, choose fee factor as actual subsidy factor
            // since we should subsidize less if we charge less.
            uint256 actualSubsidyFactor = (_subsidyFactor < _feeFactor) ? _subsidyFactor : _feeFactor;
            // inSubsidyRange = ((makerAssetAmount - receivedAmount) / receivedAmount) > (actualSubsidyFactor / 10000)
            bool inSubsidyRange = _order.makerAssetAmount.sub(_txMetaData.receivedAmount).mul(BPS_MAX) <= actualSubsidyFactor.mul(_txMetaData.receivedAmount);
            require(inSubsidyRange, "AMMWrapper: amount difference larger than subsidy amount");
            uint256 selfBalance = _getSelfBalance(_internalTxData.makerAssetInternalAddr);
            bool hasEnoughToSubsidize = selfBalance >= _order.makerAssetAmount;
            if (! hasEnoughToSubsidize && _isInternalAssetETH(_internalTxData.makerAssetInternalAddr)) {
                // We treat ETH and WETH the same so we have to convert WETH to ETH if ETH balance is not enough.
                uint256 amountShort = _order.makerAssetAmount.sub(selfBalance);
                if (amountShort <= weth.balanceOf(address(this))) {
                    // Withdraw the amount short from WETH
                    weth.withdraw(amountShort);
                    // Now we have enough
                    hasEnoughToSubsidize = true;
                }
            }
            require(hasEnoughToSubsidize, "AMMWrapper: not enough savings to subsidize");
            settleAmount = _order.makerAssetAmount;
        }
        // Transfer token/ETH to receiver
        if (_internalTxData.toEth) {
            // Withdraw from WETH if internal maker asset is WETH
            if (! _isInternalAssetETH(_internalTxData.makerAssetInternalAddr)) {
                weth.withdraw(settleAmount);
            }
            _order.receiverAddr.transfer(settleAmount);
        } else {
            // other ERC20 tokens
            IERC20(_order.makerAssetAddr).safeTransfer(_order.receiverAddr, settleAmount);
        }
    }
    function _tradeCurveTokenToToken(
        address _makerAddr,
        int128 i,
        int128 j,
        uint256 _takerAssetAmount,
        uint256 _makerAssetAmount,
        uint16 swapMethod
    ) 
        internal
    {
        ICurveFi curve = ICurveFi(_makerAddr);
        if (swapMethod == 1) {
            curve.exchange{value: msg.value}(i, j, _takerAssetAmount, _makerAssetAmount);
        } else if (swapMethod == 2) {
            curve.exchange_underlying{value: msg.value}(i, j, _takerAssetAmount, _makerAssetAmount);
        }
    }
    function _tradeUniswapV2TokenToToken(
        address _makerAddr,
        address _takerAssetAddr,
        address _makerAssetAddr,
        uint256 _takerAssetAmount,
        uint256 _makerAssetAmount,
        uint256 _deadline
    )
        internal 
        returns (uint256) 
    {
        IUniswapRouterV2 router = IUniswapRouterV2(_makerAddr);
        address[] memory path = new address[](2);
        path[0] = _takerAssetAddr;
        path[1] = _makerAssetAddr;
        uint256[] memory amounts = router.swapExactTokensForTokens(
            _takerAssetAmount,
            _makerAssetAmount,
            path,
            address(this),
            _deadline
        );
        return amounts[1];
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0 <0.8.0;
interface IUniswapRouterV2 {
    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );
    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);
    function getAmountsOut(uint256 amountIn, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);
    function getAmountsIn(uint256 amountOut, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);
    function swapETHForExactTokens(
        uint256 amountOut,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);
    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);
}// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0 <0.8.0;
pragma experimental ABIEncoderV2;
import "./IUniswapV3SwapCallback.sol";
/// @title Router token swapping functionality
/// @notice Functions for swapping tokens via Uniswap V3
interface ISwapRouter is IUniswapV3SwapCallback {
    struct ExactInputSingleParams {
        address tokenIn;
        address tokenOut;
        uint24 fee;
        address recipient;
        uint256 deadline;
        uint256 amountIn;
        uint256 amountOutMinimum;
        uint160 sqrtPriceLimitX96;
    }
    /// @notice Swaps `amountIn` of one token for as much as possible of another token
    /// @param params The parameters necessary for the swap, encoded as `ExactInputSingleParams` in calldata
    /// @return amountOut The amount of the received token
    function exactInputSingle(ExactInputSingleParams calldata params) external payable returns (uint256 amountOut);
    struct ExactInputParams {
        bytes path;
        address recipient;
        uint256 deadline;
        uint256 amountIn;
        uint256 amountOutMinimum;
    }
    /// @notice Swaps `amountIn` of one token for as much as possible of another along the specified path
    /// @param params The parameters necessary for the multi-hop swap, encoded as `ExactInputParams` in calldata
    /// @return amountOut The amount of the received token
    function exactInput(ExactInputParams calldata params) external payable returns (uint256 amountOut);
    struct ExactOutputSingleParams {
        address tokenIn;
        address tokenOut;
        uint24 fee;
        address recipient;
        uint256 deadline;
        uint256 amountOut;
        uint256 amountInMaximum;
        uint160 sqrtPriceLimitX96;
    }
    /// @notice Swaps as little as possible of one token for `amountOut` of another token
    /// @param params The parameters necessary for the swap, encoded as `ExactOutputSingleParams` in calldata
    /// @return amountIn The amount of the input token
    function exactOutputSingle(ExactOutputSingleParams calldata params) external payable returns (uint256 amountIn);
    struct ExactOutputParams {
        bytes path;
        address recipient;
        uint256 deadline;
        uint256 amountOut;
        uint256 amountInMaximum;
    }
    /// @notice Swaps as little as possible of one token for `amountOut` of another along the specified path (reversed)
    /// @param params The parameters necessary for the multi-hop swap, encoded as `ExactOutputParams` in calldata
    /// @return amountIn The amount of the input token
    function exactOutput(ExactOutputParams calldata params) external payable returns (uint256 amountIn);
}// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.6.0;
library BytesLib {
    function slice(
        bytes memory _bytes,
        uint256 _start,
        uint256 _length
    ) internal pure returns (bytes memory) {
        require(_length + 31 >= _length, "slice_overflow");
        require(_start + _length >= _start, "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(_start + 20 >= _start, "toAddress_overflow");
        require(_bytes.length >= _start + 20, "toAddress_outOfBounds");
        address tempAddress;
        assembly {
            tempAddress := div(mload(add(add(_bytes, 0x20), _start)), 0x1000000000000000000000000)
        }
        return tempAddress;
    }
    function toUint24(bytes memory _bytes, uint256 _start) internal pure returns (uint24) {
        require(_start + 3 >= _start, "toUint24_overflow");
        require(_bytes.length >= _start + 3, "toUint24_outOfBounds");
        uint24 tempUint;
        assembly {
            tempUint := mload(add(add(_bytes, 0x3), _start))
        }
        return tempUint;
    }
}
/// @title Functions for manipulating path data for multihop swaps
library Path {
    using BytesLib for bytes;
    /// @dev The length of the bytes encoded address
    uint256 private constant ADDR_SIZE = 20;
    /// @dev The length of the bytes encoded fee
    uint256 private constant FEE_SIZE = 3;
    /// @dev The offset of a single token address and pool fee
    uint256 private constant NEXT_OFFSET = ADDR_SIZE + FEE_SIZE;
    /// @dev The offset of an encoded pool key
    uint256 private constant POP_OFFSET = NEXT_OFFSET + ADDR_SIZE;
    /// @dev The minimum length of an encoding that contains 2 or more pools
    uint256 private constant MULTIPLE_POOLS_MIN_LENGTH = POP_OFFSET + NEXT_OFFSET;
    /// @notice Returns true iff the path contains two or more pools
    /// @param path The encoded swap path
    /// @return True if path contains two or more pools, otherwise false
    function hasMultiplePools(bytes memory path) internal pure returns (bool) {
        return path.length >= MULTIPLE_POOLS_MIN_LENGTH;
    }
    /// @notice Decodes the first pool in path
    /// @param path The bytes encoded swap path
    /// @return tokenA The first token of the given pool
    /// @return tokenB The second token of the given pool
    /// @return fee The fee level of the pool
    function decodeFirstPool(bytes memory path)
        internal
        pure
        returns (
            address tokenA,
            address tokenB,
            uint24 fee
        )
    {
        tokenA = path.toAddress(0);
        fee = path.toUint24(ADDR_SIZE);
        tokenB = path.toAddress(NEXT_OFFSET);
    }
    /// @notice Skips a token + fee element from the buffer and returns the remainder
    /// @param path The swap path
    /// @return The remaining token + fee elements in the path
    function skipToken(bytes memory path) internal pure returns (bytes memory) {
        return path.slice(NEXT_OFFSET, path.length - NEXT_OFFSET);
    }
}pragma solidity >=0.5.0 <0.8.0;
interface IUniswapExchange {
    // Address of ERC20 token sold on this exchange
    function tokenAddress() external view returns (address token);
    // Address of Uniswap Factory
    function factoryAddress() external view returns (address factory);
    // Provide Liquidity
    function addLiquidity(uint256 min_liquidity, uint256 max_tokens, uint256 deadline) external payable returns (uint256);
    function removeLiquidity(uint256 amount, uint256 min_eth, uint256 min_tokens, uint256 deadline) external returns (uint256, uint256);
    // Get Prices
    function getEthToTokenInputPrice(uint256 eth_sold) external view returns (uint256 tokens_bought);
    function getEthToTokenOutputPrice(uint256 tokens_bought) external view returns (uint256 eth_sold);
    function getTokenToEthInputPrice(uint256 tokens_sold) external view returns (uint256 eth_bought);
    function getTokenToEthOutputPrice(uint256 eth_bought) external view returns (uint256 tokens_sold);
    // Trade ETH to ERC20
    function ethToTokenSwapInput(uint256 min_tokens, uint256 deadline) external payable returns (uint256 tokens_bought);
    function ethToTokenTransferInput(uint256 min_tokens, uint256 deadline, address recipient) external payable returns (uint256  tokens_bought);
    function ethToTokenSwapOutput(uint256 tokens_bought, uint256 deadline) external payable returns (uint256  eth_sold);
    function ethToTokenTransferOutput(uint256 tokens_bought, uint256 deadline, address recipient) external payable returns (uint256  eth_sold);
    // Trade ERC20 to ETH
    function tokenToEthSwapInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline) external returns (uint256  eth_bought);
    function tokenToEthTransferInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline, address recipient) external returns (uint256  eth_bought);
    function tokenToEthSwapOutput(uint256 eth_bought, uint256 max_tokens, uint256 deadline) external returns (uint256  tokens_sold);
    function tokenToEthTransferOutput(uint256 eth_bought, uint256 max_tokens, uint256 deadline, address recipient) external returns (uint256  tokens_sold);
    // Trade ERC20 to ERC20
    function tokenToTokenSwapInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address token_addr) external returns (uint256  tokens_bought);
    function tokenToTokenTransferInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address recipient, address token_addr) external returns (uint256  tokens_bought);
    function tokenToTokenSwapOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address token_addr) external returns (uint256  tokens_sold);
    function tokenToTokenTransferOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address recipient, address token_addr) external returns (uint256  tokens_sold);
    // Trade ERC20 to Custom Pool
    function tokenToExchangeSwapInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address exchange_addr) external returns (uint256  tokens_bought);
    function tokenToExchangeTransferInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address recipient, address exchange_addr) external returns (uint256  tokens_bought);
    function tokenToExchangeSwapOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address exchange_addr) external returns (uint256  tokens_sold);
    function tokenToExchangeTransferOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address recipient, address exchange_addr) external returns (uint256  tokens_sold);
    // ERC20 comaptibility for liquidity tokens
    function name() external view returns (bytes32);
    function symbol() external view returns (bytes32);
    function decimals() external view returns (uint256);
    function transfer(address _to, uint256 _value) external returns (bool);
    function transferFrom(address _from, address _to, uint256 value) external returns (bool);
    function approve(address _spender, uint256 _value) external returns (bool);
    function allowance(address _owner, address _spender) external view returns (uint256);
    function balanceOf(address _owner) external view returns (uint256);
    function totalSupply() external view returns (uint256);
    // Never use
    function setup(address token_addr) external;
}
pragma solidity >=0.5.0 <0.8.0;
interface IUniswapFactory {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint256
    );
    function getPair(address tokenA, address tokenB)
        external
        view
        returns (address pair);
    function allPairs(uint256) external view returns (address pair);
    function allPairsLength() external view returns (uint256);
    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
    // Create Exchange
    function createExchange(address token) external returns (address exchange);
    // Get Exchange and Token Info
    function getExchange(address token) external view returns (address exchange);
    function getToken(address exchange) external view returns (address token);
    function getTokenWithId(uint256 tokenId) external view returns (address token);
    // Never use
    function initializeFactory(address template) external;
}
    
    pragma solidity >=0.5.0 <0.8.0;
interface ICurveFi {
    function get_virtual_price() external returns (uint256 out);
    function add_liquidity(
        uint256[2] calldata amounts,
        uint256 deadline
    ) external;
    function add_liquidity(
        // sBTC pool
        uint256[3] calldata amounts,
        uint256 min_mint_amount
    ) external;
    function add_liquidity(
        // bUSD pool
        uint256[4] calldata amounts,
        uint256 min_mint_amount
    ) external;
    function get_dx(
        int128 i,
        int128 j,
        uint256 dy
    ) external view returns (uint256 out);
    function get_dx_underlying(
        int128 i,
        int128 j,
        uint256 dy
    ) external view returns (uint256 out);
    function get_dy(
        int128 i,
        int128 j,
        uint256 dx
    ) external view returns (uint256 out);
    function get_dy_underlying(
        int128 i,
        int128 j,
        uint256 dx
    ) external view returns (uint256 out);
    function exchange(
        int128 i,
        int128 j,
        uint256 dx,
        uint256 min_dy
    ) external payable;
    function exchange(
        int128 i,
        int128 j,
        uint256 dx,
        uint256 min_dy,
        uint256 deadline
    ) external payable;
    function exchange_underlying(
        int128 i,
        int128 j,
        uint256 dx,
        uint256 min_dy
    ) external payable;
    function exchange_underlying(
        int128 i,
        int128 j,
        uint256 dx,
        uint256 min_dy,
        uint256 deadline
    ) external payable;
    function remove_liquidity(
        uint256 _amount,
        uint256 deadline,
        uint256[2] calldata min_amounts
    ) external;
    function remove_liquidity_imbalance(
        uint256[2] calldata amounts,
        uint256 deadline
    ) external;
    function remove_liquidity_imbalance(
        uint256[3] calldata amounts,
        uint256 max_burn_amount
    ) external;
    function remove_liquidity(uint256 _amount, uint256[3] calldata amounts)
        external;
    function remove_liquidity_imbalance(
        uint256[4] calldata amounts,
        uint256 max_burn_amount
    ) external;
    function remove_liquidity(uint256 _amount, uint256[4] calldata amounts)
        external;
    function commit_new_parameters(
        int128 amplification,
        int128 new_fee,
        int128 new_admin_fee
    ) external;
    function apply_new_parameters() external;
    function revert_new_parameters() external;
    function commit_transfer_ownership(address _owner) external;
    function apply_transfer_ownership() external;
    function revert_transfer_ownership() external;
    function withdraw_admin_fees() external;
    function coins(int128 arg0) external returns (address out);
    function underlying_coins(int128 arg0) external returns (address out);
    function balances(int128 arg0) external returns (uint256 out);
    function A() external returns (int128 out);
    function fee() external returns (int128 out);
    function admin_fee() external returns (int128 out);
    function owner() external returns (address out);
    function admin_actions_deadline() external returns (uint256 out);
    function transfer_ownership_deadline() external returns (uint256 out);
    function future_A() external returns (int128 out);
    function future_fee() external returns (int128 out);
    function future_admin_fee() external returns (int128 out);
    function future_owner() external returns (address out);
}
pragma solidity ^0.6.0;
import "./BaseLibEIP712.sol";
contract AMMLibEIP712 is BaseLibEIP712 {
    /***********************************|
    |             Constants             |
    |__________________________________*/
    struct Order {
        address makerAddr;
        address takerAssetAddr;
        address makerAssetAddr;
        uint256 takerAssetAmount;
        uint256 makerAssetAmount;
        address userAddr;
        address payable receiverAddr;
        uint256 salt;
        uint256 deadline;
    }
    // keccak256("tradeWithPermit(address makerAddr,address takerAssetAddr,address makerAssetAddr,uint256 takerAssetAmount,uint256 makerAssetAmount,address userAddr,address receiverAddr,uint256 salt,uint256 deadline)");
    bytes32 public constant TRADE_WITH_PERMIT_TYPEHASH = keccak256(
        abi.encodePacked(
            "tradeWithPermit(",
            "address makerAddr,",
            "address takerAssetAddr,",
            "address makerAssetAddr,",
            "uint256 takerAssetAmount,",
            "uint256 makerAssetAmount,",
            "address userAddr,",
            "address receiverAddr,",
            "uint256 salt,",
            "uint256 deadline",
            ")"
        )
    );
}// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0 <0.8.0;
/// @title Callback for IUniswapV3PoolActions#swap
/// @notice Any contract that calls IUniswapV3PoolActions#swap must implement this interface
interface IUniswapV3SwapCallback {
    /// @notice Called to `msg.sender` after executing a swap via IUniswapV3Pool#swap.
    /// @dev In the implementation you must pay the pool tokens owed for the swap.
    /// The caller of this method must be checked to be a UniswapV3Pool deployed by the canonical UniswapV3Factory.
    /// amount0Delta and amount1Delta can both be 0 if no tokens were swapped.
    /// @param amount0Delta The amount of token0 that was sent (negative) or must be received (positive) by the pool by
    /// the end of the swap. If positive, the callback must send that amount of token0 to the pool.
    /// @param amount1Delta The amount of token1 that was sent (negative) or must be received (positive) by the pool by
    /// the end of the swap. If positive, the callback must send that amount of token1 to the pool.
    /// @param data Any data passed through by the caller via the IUniswapV3PoolActions#swap call
    function uniswapV3SwapCallback(
        int256 amount0Delta,
        int256 amount1Delta,
        bytes calldata data
    ) external;
}pragma solidity ^0.6.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "./interfaces/IWeth.sol";
import "./pmm/mmp/Ownable.sol";
import "./pmm/0xLibs/LibDecoder.sol";
interface IIMBTC {
    function burn(uint256 amount, bytes calldata data) external;
}
interface IWBTC {
    function burn(uint256 value) external;
}
contract MarketMakerProxy is 
    Ownable,
    LibDecoder
{
    using SafeERC20 for IERC20;
    string public constant version = "5.0.0";
    uint256 constant MAX_UINT = 2**256 - 1;
    address public SIGNER;
    // auto withdraw weth to eth
    address public WETH_ADDR;
    address public withdrawer;
    mapping (address => bool) public isWithdrawWhitelist;
    modifier onlyWithdrawer() {
        require(
            msg.sender == withdrawer,
            "MarketMakerProxy: only contract withdrawer"
        );
        _;
    }
    constructor () public {
        owner = msg.sender;
        operator = msg.sender;
    }
    receive() external payable {}
    // Manage
    function setSigner(address _signer) public onlyOperator {
        SIGNER = _signer;
    }
    function setConfig(address _weth) public onlyOperator {
        WETH_ADDR = _weth;
    }
    function setWithdrawer(address _withdrawer) public onlyOperator {
        withdrawer = _withdrawer;
    }
    function setAllowance(address[] memory token_addrs, address spender) public onlyOperator {
        for (uint i = 0; i < token_addrs.length; i++) {
            address token = token_addrs[i];
            IERC20(token).safeApprove(spender, MAX_UINT);
        }
    }
    function closeAllowance(address[] memory token_addrs, address spender) public onlyOperator {
        for (uint i = 0; i < token_addrs.length; i++) {
            address token = token_addrs[i];
            IERC20(token).safeApprove(spender, 0);
        }
    }
    function registerWithdrawWhitelist(address _addr, bool _add) public onlyOperator {
        isWithdrawWhitelist[_addr] = _add;
    }
    function withdraw(address token, address payable to, uint256 amount) public onlyWithdrawer {
        require(
            isWithdrawWhitelist[to],
            "MarketMakerProxy: not in withdraw whitelist"
        );
        if(token == WETH_ADDR) {
            IWETH(WETH_ADDR).withdraw(amount);
            to.transfer(amount);
        } else {
            IERC20(token).safeTransfer(to , amount);
        }
    }
    function withdrawETH(address payable to, uint256 amount) public onlyWithdrawer {
        require(
            isWithdrawWhitelist[to],
            "MarketMakerProxy: not in withdraw whitelist"
        );
        to.transfer(amount);
    }
    function isValidSignature(bytes32 orderHash, bytes memory signature) public view returns (bytes32) {
        require(
            SIGNER == _ecrecoverAddress(orderHash, signature),
            "MarketMakerProxy: invalid signature"
        );
        return keccak256("isValidWalletSignature(bytes32,address,bytes)");
    }
    function _ecrecoverAddress(bytes32 orderHash, bytes memory signature) internal pure returns (address) {
        (uint8 v, bytes32 r, bytes32 s) = decodeMmSignature(signature);
        return ecrecover(
            keccak256(
                abi.encodePacked(
                    "\\x19Ethereum Signed Message:\
32",
                    orderHash
                )),
            v, r, s
        );
    }
}
pragma solidity ^0.6.0;
contract Ownable {
  address public owner;
  address public operator;
  constructor ()
    public
  {
    owner = msg.sender;
  }
  modifier onlyOwner() {
    require(
      msg.sender == owner,
      "Ownable: only contract owner"
    );
    _;
  }
  modifier onlyOperator() {
    require(
      msg.sender == operator,
      "Ownable: only contract operator"
    );
    _;
  }
  function transferOwnership(address newOwner)
    public
    onlyOwner
  {
    if (newOwner != address(0)) {
      owner = newOwner;
    }
  }
  function setOperator(address newOperator)
    public
    onlyOwner 
  {
    operator = newOperator;
  }
}pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;
import "@openzeppelin/contracts/math/SafeMath.sol";
import "./interfaces/IUniswapExchange.sol";
import "./interfaces/IUniswapFactory.sol";
import "./interfaces/IUniswapRouterV2.sol";
import "./interfaces/ICurveFi.sol";
import "./interfaces/IWeth.sol";
import "./interfaces/IPermanentStorage.sol";
import "./interfaces/IUniswapV3Quoter.sol";
import "./utils/LibBytes.sol";
/// This contract is designed to be called off-chain.
/// At T1, 4 requests would be made in order to get quote, which is for Uniswap v2, v3, Sushiswap and others.
/// For those source without path design, we can find best out amount in this contract.
/// For Uniswap and Sushiswap, best path would be calculated off-chain, we only verify out amount in this contract.
contract AMMQuoter {
    using SafeMath for uint256;
    using LibBytes for bytes;
    /* Constants */
    string public constant version = "5.2.0";
    address private constant ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    address private constant ZERO_ADDRESS = address(0);
    address public constant UNISWAP_V2_ROUTER_02_ADDRESS = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address public constant UNISWAP_V3_ROUTER_ADDRESS = 0xE592427A0AEce92De3Edee1F18E0157C05861564;
    address public constant UNISWAP_V3_QUOTER_ADDRESS = 0xb27308f9F90D607463bb33eA1BeBb41C27CE5AB6;
    address public constant SUSHISWAP_ROUTER_ADDRESS = 0xd9e1cE17f2641f24aE83637ab66a2cca9C378B9F;
    address public immutable weth;
    IPermanentStorage public immutable permStorage;
    struct GroupedVars {
        address makerAddr;
        address takerAssetAddr;
        address makerAssetAddr;
        uint256 takerAssetAmount;
        uint256 makerAssetAmount;
        address[] path;
    }
    event CurveTokenAdded(
        address indexed makerAddress,
        address indexed assetAddress,
        int128 index
    );
    constructor (IPermanentStorage _permStorage, address _weth) public {
        permStorage = _permStorage;
        weth = _weth;
    }
    function isETH(address assetAddress) public pure returns (bool) {
        return (assetAddress == ZERO_ADDRESS || assetAddress == ETH_ADDRESS);
    }
    function getMakerOutAmountWithPath(
        address _makerAddr,
        address _takerAssetAddr,
        address _makerAssetAddr,
        uint256 _takerAssetAmount,
        address[] calldata _path,
        bytes memory _makerSpecificData
    )
        public
        returns (uint256 makerAssetAmount)
    {
        GroupedVars memory vars;
        vars.makerAddr = _makerAddr;
        vars.takerAssetAddr = _takerAssetAddr;
        vars.makerAssetAddr = _makerAssetAddr;
        vars.takerAssetAmount = _takerAssetAmount;
        vars.path = _path;
        if (vars.makerAddr == UNISWAP_V2_ROUTER_02_ADDRESS ||
            vars.makerAddr == SUSHISWAP_ROUTER_ADDRESS) {
            IUniswapRouterV2 router = IUniswapRouterV2(vars.makerAddr);
            uint256[] memory amounts = router.getAmountsOut(vars.takerAssetAmount, vars.path);
            makerAssetAmount = amounts[amounts.length-1];
        } else if (vars.makerAddr == UNISWAP_V3_ROUTER_ADDRESS) {
            IUniswapV3Quoter quoter = IUniswapV3Quoter(UNISWAP_V3_QUOTER_ADDRESS);
            // swapType:
            // 1: exactInputSingle, 2: exactInput, 3: exactOuputSingle, 4: exactOutput
            uint8 swapType = uint8(uint256(_makerSpecificData.readBytes32(0)));
            if (swapType == 1) {
                address v3TakerInternalAsset = isETH(vars.takerAssetAddr) ? weth : vars.takerAssetAddr;
                address v3MakerInternalAsset = isETH(vars.makerAssetAddr) ? weth : vars.makerAssetAddr;
                (, uint24 poolFee) = abi.decode(_makerSpecificData, (uint8, uint24));
                makerAssetAmount = quoter.quoteExactInputSingle(v3TakerInternalAsset, v3MakerInternalAsset, poolFee, vars.takerAssetAmount, 0);
            } else if (swapType == 2) {
                (, bytes memory path) = abi.decode(_makerSpecificData, (uint8, bytes));
                makerAssetAmount = quoter.quoteExactInput(path, vars.takerAssetAmount);
            } else {
                revert("AMMQuoter: Invalid UniswapV3 swap type");
            }
        } else {
            address curveTakerIntenalAsset = isETH(vars.takerAssetAddr) ? ETH_ADDRESS : vars.takerAssetAddr;
            address curveMakerIntenalAsset = isETH(vars.makerAssetAddr) ? ETH_ADDRESS : vars.makerAssetAddr;
            (int128 fromTokenCurveIndex, int128 toTokenCurveIndex, uint16 swapMethod,) = permStorage.getCurvePoolInfo(vars.makerAddr, curveTakerIntenalAsset, curveMakerIntenalAsset);
            if (fromTokenCurveIndex > 0 && toTokenCurveIndex > 0) {
                require(swapMethod != 0, "AMMQuoter: swap method not registered");
                // Substract index by 1 because indices stored in `permStorage` starts from 1
                fromTokenCurveIndex = fromTokenCurveIndex - 1;
                toTokenCurveIndex = toTokenCurveIndex - 1;
                ICurveFi curve = ICurveFi(vars.makerAddr);
                if (swapMethod == 1) {
                    makerAssetAmount = curve.get_dy(fromTokenCurveIndex, toTokenCurveIndex, vars.takerAssetAmount).sub(1);
                } else if (swapMethod == 2) {
                    makerAssetAmount = curve.get_dy_underlying(fromTokenCurveIndex, toTokenCurveIndex, vars.takerAssetAmount).sub(1);
                }
            } else {
                revert("AMMQuoter: Unsupported makerAddr");
            }
        }
        return makerAssetAmount;
    }
    function getMakerOutAmount(
        address _makerAddr,
        address _takerAssetAddr,
        address _makerAssetAddr,
        uint256 _takerAssetAmount
    )
        public
        view
        returns (uint256)
    {
        uint256 makerAssetAmount;
        if (_makerAddr == UNISWAP_V2_ROUTER_02_ADDRESS ||
            _makerAddr == SUSHISWAP_ROUTER_ADDRESS) {
            IUniswapRouterV2 router = IUniswapRouterV2(_makerAddr);
            address[] memory path = new address[](2);
            if (isETH(_takerAssetAddr)) {
                path[0] = weth;
                path[1] = _makerAssetAddr;
            } else if (isETH(_makerAssetAddr)) {
                path[0] = _takerAssetAddr;
                path[1] = weth;
            } else {
                path[0] = _takerAssetAddr;
                path[1] = _makerAssetAddr;
            }
            uint256[] memory amounts = router.getAmountsOut(_takerAssetAmount, path);
            makerAssetAmount = amounts[1];
        } else {
            address curveTakerIntenalAsset = isETH(_takerAssetAddr) ? ETH_ADDRESS : _takerAssetAddr;
            address curveMakerIntenalAsset = isETH(_makerAssetAddr) ? ETH_ADDRESS : _makerAssetAddr;
            (int128 fromTokenCurveIndex, int128 toTokenCurveIndex, uint16 swapMethod,) = permStorage.getCurvePoolInfo(_makerAddr, curveTakerIntenalAsset, curveMakerIntenalAsset);
            if (fromTokenCurveIndex > 0 && toTokenCurveIndex > 0) {
                require(swapMethod != 0, "AMMQuoter: swap method not registered");
                // Substract index by 1 because indices stored in `permStorage` starts from 1
                fromTokenCurveIndex = fromTokenCurveIndex - 1;
                toTokenCurveIndex = toTokenCurveIndex - 1;
                ICurveFi curve = ICurveFi(_makerAddr);
                if (swapMethod == 1) {
                    makerAssetAmount = curve.get_dy(fromTokenCurveIndex, toTokenCurveIndex, _takerAssetAmount).sub(1);
                } else if (swapMethod == 2) {
                    makerAssetAmount = curve.get_dy_underlying(fromTokenCurveIndex, toTokenCurveIndex, _takerAssetAmount).sub(1);
                }
            } else {
                revert("AMMQuoter: Unsupported makerAddr");
            }
        }
        return makerAssetAmount;
    }
    /// @dev This function is designed for finding best out amount among AMM makers other than Uniswap and Sushiswap
    function getBestOutAmount(
        address[] calldata _makerAddresses,
        address _takerAssetAddr,
        address _makerAssetAddr,
        uint256 _takerAssetAmount
    )
        external
        view
        returns (address bestMaker, uint256 bestAmount)
    {
        bestAmount = 0;
        uint256 poolLength = _makerAddresses.length;
        for (uint256 i = 0; i < poolLength; i++) {
            address makerAddress = _makerAddresses[i];
            uint256 makerAssetAmount = getMakerOutAmount(makerAddress, _takerAssetAddr, _makerAssetAddr, _takerAssetAmount);
            if (makerAssetAmount > bestAmount) {
                bestAmount = makerAssetAmount;
                bestMaker = makerAddress;
            }
        }
        return (bestMaker, bestAmount);
    }
    function getTakerInAmountWithPath(
        address _makerAddr,
        address _takerAssetAddr,
        address _makerAssetAddr,
        uint256 _makerAssetAmount,
        address[] calldata _path,
        bytes memory _makerSpecificData
    )
        public
        returns (uint256 takerAssetAmount)
    {
        GroupedVars memory vars;
        vars.makerAddr = _makerAddr;
        vars.takerAssetAddr = _takerAssetAddr;
        vars.makerAssetAddr = _makerAssetAddr;
        vars.makerAssetAmount = _makerAssetAmount;
        vars.path = _path;
        if (vars.makerAddr == UNISWAP_V2_ROUTER_02_ADDRESS ||
            vars.makerAddr == SUSHISWAP_ROUTER_ADDRESS) {
            IUniswapRouterV2 router = IUniswapRouterV2(vars.makerAddr);
            uint256[] memory amounts = router.getAmountsIn(vars.makerAssetAmount, _path);
            takerAssetAmount = amounts[0];
        } else if (vars.makerAddr == UNISWAP_V3_ROUTER_ADDRESS) {
            IUniswapV3Quoter quoter = IUniswapV3Quoter(UNISWAP_V3_QUOTER_ADDRESS);
            // swapType:
            // 1: exactInputSingle, 2: exactInput, 3: exactOuputSingle, 4: exactOutput
            uint8 swapType = uint8(uint256(_makerSpecificData.readBytes32(0)));
            if (swapType == 3) {
                address v3TakerInternalAsset = isETH(vars.takerAssetAddr) ? weth : vars.takerAssetAddr;
                address v3MakerInternalAsset = isETH(vars.makerAssetAddr) ? weth : vars.makerAssetAddr;
                (, uint24 poolFee) = abi.decode(_makerSpecificData, (uint8, uint24));
                takerAssetAmount = quoter.quoteExactOutputSingle(v3TakerInternalAsset, v3MakerInternalAsset, poolFee, vars.makerAssetAmount, 0);
            } else if (swapType == 4) {
                (, bytes memory path) = abi.decode(_makerSpecificData, (uint8, bytes));
                takerAssetAmount = quoter.quoteExactOutput(path, vars.makerAssetAmount);
            } else {
                revert("AMMQuoter: Invalid UniswapV3 swap type");
            }
        } else {
            address curveTakerIntenalAsset = isETH(vars.takerAssetAddr) ? ETH_ADDRESS : vars.takerAssetAddr;
            address curveMakerIntenalAsset = isETH(vars.makerAssetAddr) ? ETH_ADDRESS : vars.makerAssetAddr;
            (int128 fromTokenCurveIndex, int128 toTokenCurveIndex, uint16 swapMethod, bool supportGetDx) = permStorage.getCurvePoolInfo(vars.makerAddr, curveTakerIntenalAsset, curveMakerIntenalAsset);
            if (fromTokenCurveIndex > 0 && toTokenCurveIndex > 0) {
                require(swapMethod != 0, "AMMQuoter: swap method not registered");
                // Substract index by 1 because indices stored in `permStorage` starts from 1
                fromTokenCurveIndex = fromTokenCurveIndex - 1;
                toTokenCurveIndex = toTokenCurveIndex - 1;
                ICurveFi curve = ICurveFi(vars.makerAddr);
                if (supportGetDx) {
                    if (swapMethod == 1) {
                        takerAssetAmount = curve.get_dx(fromTokenCurveIndex, toTokenCurveIndex, vars.makerAssetAmount);
                    } else if (swapMethod == 2) {
                        takerAssetAmount = curve.get_dx_underlying(fromTokenCurveIndex, toTokenCurveIndex, vars.makerAssetAmount);
                    }
                } else {
                    if (swapMethod == 1) {
                        // does not support get_dx_underlying, try to get an estimated rate here
                        takerAssetAmount = curve.get_dy(toTokenCurveIndex, fromTokenCurveIndex, vars.makerAssetAmount);
                    } else if (swapMethod == 2) {
                        takerAssetAmount = curve.get_dy_underlying(toTokenCurveIndex, fromTokenCurveIndex, vars.makerAssetAmount);
                    }
                }
            } else {
                revert("AMMQuoter: Unsupported makerAddr");
            }
        }
        return takerAssetAmount;
    }
    function getTakerInAmount(
        address _makerAddr,
        address _takerAssetAddr,
        address _makerAssetAddr,
        uint256 _makerAssetAmount
    )
        public
        view
        returns (uint256)
    {
        uint256 takerAssetAmount;
        if (_makerAddr == UNISWAP_V2_ROUTER_02_ADDRESS ||
            _makerAddr == SUSHISWAP_ROUTER_ADDRESS) {
            IUniswapRouterV2 router = IUniswapRouterV2(_makerAddr);
            address[] memory path = new address[](2);
            if (isETH(_takerAssetAddr)) {
                path[0] = weth;
                path[1] = _makerAssetAddr;
            } else if (isETH(_makerAssetAddr)) {
                path[0] = _takerAssetAddr;
                path[1] = weth;
            } else {
                path[0] = _takerAssetAddr;
                path[1] = _makerAssetAddr;
            }
            uint256[] memory amounts = router.getAmountsIn(_makerAssetAmount, path);
            takerAssetAmount = amounts[0];
        } else {
            address curveTakerIntenalAsset = isETH(_takerAssetAddr) ? ETH_ADDRESS : _takerAssetAddr;
            address curveMakerIntenalAsset = isETH(_makerAssetAddr) ? ETH_ADDRESS : _makerAssetAddr;
            (int128 fromTokenCurveIndex, int128 toTokenCurveIndex, uint16 swapMethod, bool supportGetDx) = permStorage.getCurvePoolInfo(_makerAddr, curveTakerIntenalAsset, curveMakerIntenalAsset);
            if (fromTokenCurveIndex > 0 && toTokenCurveIndex > 0) {
                require(swapMethod != 0, "AMMQuoter: swap method not registered");
                // Substract index by 1 because indices stored in `permStorage` starts from 1
                fromTokenCurveIndex = fromTokenCurveIndex - 1;
                toTokenCurveIndex = toTokenCurveIndex - 1;
                ICurveFi curve = ICurveFi(_makerAddr);
                if (supportGetDx) {
                    if (swapMethod == 1) {
                        takerAssetAmount = curve.get_dx(fromTokenCurveIndex, toTokenCurveIndex, _makerAssetAmount);
                    } else if (swapMethod == 2) {
                        takerAssetAmount = curve.get_dx_underlying(fromTokenCurveIndex, toTokenCurveIndex, _makerAssetAmount);
                    }
                } else {
                    if (swapMethod == 1) {
                        // does not support get_dx_underlying, try to get an estimated rate here
                        takerAssetAmount = curve.get_dy(toTokenCurveIndex, fromTokenCurveIndex, _makerAssetAmount);
                    } else if (swapMethod == 2) {
                        takerAssetAmount = curve.get_dy_underlying(toTokenCurveIndex, fromTokenCurveIndex, _makerAssetAmount);
                    }
                }
            } else {
                revert("AMMQuoter: Unsupported makerAddr");
            }
        }
        return takerAssetAmount;
    }
    /// @dev This function is designed for finding best in amount among AMM makers other than Uniswap and Sushiswap
    function getBestInAmount(
        address[] calldata _makerAddresses,
        address _takerAssetAddr,
        address _makerAssetAddr,
        uint256 _makerAssetAmount
    )
        external
        view
        returns (address bestMaker, uint256 bestAmount)
    {
        bestAmount = 2**256 - 1;
        uint256 poolLength = _makerAddresses.length;
        for (uint256 i = 0; i < poolLength; i++) {
            address makerAddress = _makerAddresses[i];
            uint256 takerAssetAmount = getTakerInAmount(makerAddress, _takerAssetAddr, _makerAssetAddr, _makerAssetAmount);
            if (takerAssetAmount < bestAmount) {
                bestAmount = takerAssetAmount;
                bestMaker = makerAddress;
            }
        }
        return (bestMaker, bestAmount);
    }
}
pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;
/// @title Quoter Interface
/// @notice Supports quoting the calculated amounts from exact input or exact output swaps
/// @dev These functions are not marked view because they rely on calling non-view functions and reverting
/// to compute the result. They are also not gas efficient and should not be called on-chain.
interface IUniswapV3Quoter {
    /// @notice Returns the amount out received for a given exact input swap without executing the swap
    /// @param path The path of the swap, i.e. each token pair and the pool fee
    /// @param amountIn The amount of the first token to swap
    /// @return amountOut The amount of the last token that would be received
    function quoteExactInput(bytes memory path, uint256 amountIn) external returns (uint256 amountOut);
    /// @notice Returns the amount out received for a given exact input but for a swap of a single pool
    /// @param tokenIn The token being swapped in
    /// @param tokenOut The token being swapped out
    /// @param fee The fee of the token pool to consider for the pair
    /// @param amountIn The desired input amount
    /// @param sqrtPriceLimitX96 The price limit of the pool that cannot be exceeded by the swap
    /// @return amountOut The amount of `tokenOut` that would be received
    function quoteExactInputSingle(
        address tokenIn,
        address tokenOut,
        uint24 fee,
        uint256 amountIn,
        uint160 sqrtPriceLimitX96
    ) external returns (uint256 amountOut);
    /// @notice Returns the amount in required for a given exact output swap without executing the swap
    /// @param path The path of the swap, i.e. each token pair and the pool fee. Path must be provided in reverse order
    /// @param amountOut The amount of the last token to receive
    /// @return amountIn The amount of first token required to be paid
    function quoteExactOutput(bytes memory path, uint256 amountOut) external returns (uint256 amountIn);
    /// @notice Returns the amount in required to receive the given exact output amount but for a swap of a single pool
    /// @param tokenIn The token being swapped in
    /// @param tokenOut The token being swapped out
    /// @param fee The fee of the token pool to consider for the pair
    /// @param amountOut The desired output amount
    /// @param sqrtPriceLimitX96 The price limit of the pool that cannot be exceeded by the swap
    /// @return amountIn The amount required as the input for the swap in order to receive `amountOut`
    function quoteExactOutputSingle(
        address tokenIn,
        address tokenOut,
        uint24 fee,
        uint256 amountOut,
        uint160 sqrtPriceLimitX96
    ) external returns (uint256 amountIn);
}
pragma solidity ^0.6.0;
import "./interfaces/IHasBlackListERC20Token.sol";
import "./interfaces/ISpender.sol";
contract SpenderSimulation {
    ISpender public immutable spender;
    mapping(address => bool) public hasBlackListERC20Tokens;
    modifier checkBlackList(address _tokenAddr, address _user) {
        if (hasBlackListERC20Tokens[_tokenAddr]) {
            IHasBlackListERC20Token hasBlackListERC20Token = IHasBlackListERC20Token(_tokenAddr);
            require(!hasBlackListERC20Token.isBlackListed(_user), "SpenderSimulation: user in token's blacklist");
        }
        _;
    }
    /************************************************************
    *                       Constructor                         *
    *************************************************************/
    constructor (ISpender _spender, address[] memory _hasBlackListERC20Tokens) public {
        spender = _spender;
        for (uint256 i = 0; i < _hasBlackListERC20Tokens.length; i++) {
            hasBlackListERC20Tokens[_hasBlackListERC20Tokens[i]] = true;
        }
    }
    /************************************************************
    *                    Helper functions                       *
    *************************************************************/
    /// @dev Spend tokens on user's behalf but reverts if succeed.
    /// This is only intended to be run off-chain to check if the transfer will succeed.
    /// @param _user The user to spend token from.
    /// @param _tokenAddr The address of the token.
    /// @param _amount Amount to spend.
    function simulate(address _user, address _tokenAddr, uint256 _amount) external checkBlackList(_tokenAddr, _user) {
        spender.spendFromUser(_user, _tokenAddr, _amount);
        // All checks passed: revert with success reason string
        revert("SpenderSimulation: transfer simulation success");
    }
}
pragma solidity ^0.6.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
interface IHasBlackListERC20Token is IERC20 {
    function isBlackListed(address user) external returns (bool);
    function addBlackList(address user) external;
    function removeBlackList(address user) external;
}// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import "./upgrade_proxy/TransparentUpgradeableProxy.sol";
contract Tokenlon is TransparentUpgradeableProxy {
    constructor(address _logic, address _admin, bytes memory _data) public payable TransparentUpgradeableProxy(_logic, _admin, _data) {}
}// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "./UpgradeableProxy.sol";
/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 * 
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 * 
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 * 
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 * 
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is UpgradeableProxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {UpgradeableProxy-constructor}.
     */
    constructor(address _logic, address _admin, bytes memory _data) public payable UpgradeableProxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _setAdmin(_admin);
    }
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _admin()) {
            _;
        } else {
            _fallback();
        }
    }
    /**
     * @dev Returns the current admin.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     * 
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address) {
        return _admin();
    }
    /**
     * @dev Returns the current implementation.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     * 
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address) {
        return _implementation();
    }
    /**
     * @dev Changes the admin of the proxy.
     * 
     * Emits an {AdminChanged} event.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external ifAdmin {
        require(newAdmin != address(0), "TransparentUpgradeableProxy: new admin is the zero address");
        emit AdminChanged(_admin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev Upgrade the implementation of the proxy.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeTo(newImplementation);
    }
    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeTo(newImplementation);
        // solhint-disable-next-line avoid-low-level-calls
        (bool success,) = newImplementation.delegatecall(data);
        require(success);
    }
    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view returns (address adm) {
        bytes32 slot = _ADMIN_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            adm := sload(slot)
        }
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        bytes32 slot = _ADMIN_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newAdmin)
        }
    }
    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal override virtual {
        require(msg.sender != _admin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "@openzeppelin/contracts/utils/Address.sol";
import "./Proxy.sol";
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 * 
 * Upgradeability is only provided internally through {_upgradeTo}. For an externally upgradeable proxy see
 * {TransparentUpgradeableProxy}.
 */
contract UpgradeableProxy is Proxy {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     * 
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) public payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _setImplementation(_logic);
        if(_data.length > 0) {
            // solhint-disable-next-line avoid-low-level-calls
            (bool success,) = _logic.delegatecall(_data);
            require(success);
        }
    }
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal override view returns (address impl) {
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            impl := sload(slot)
        }
    }
    /**
     * @dev Upgrades the proxy to a new implementation.
     * 
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "UpgradeableProxy: new implementation is not a contract");
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newImplementation)
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 * 
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 * 
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     * 
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }
    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal virtual view returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     * 
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback () payable external {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive () payable external {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     * 
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {
    }
}

pragma solidity ^0.4.17;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        assert(c / a == b);
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address public owner;

    /**
      * @dev The Ownable constructor sets the original `owner` of the contract to the sender
      * account.
      */
    function Ownable() public {
        owner = msg.sender;
    }

    /**
      * @dev Throws if called by any account other than the owner.
      */
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    /**
    * @dev Allows the current owner to transfer control of the contract to a newOwner.
    * @param newOwner The address to transfer ownership to.
    */
    function transferOwnership(address newOwner) public onlyOwner {
        if (newOwner != address(0)) {
            owner = newOwner;
        }
    }

}

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20Basic {
    uint public _totalSupply;
    function totalSupply() public constant returns (uint);
    function balanceOf(address who) public constant returns (uint);
    function transfer(address to, uint value) public;
    event Transfer(address indexed from, address indexed to, uint value);
}

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
    function allowance(address owner, address spender) public constant returns (uint);
    function transferFrom(address from, address to, uint value) public;
    function approve(address spender, uint value) public;
    event Approval(address indexed owner, address indexed spender, uint value);
}

/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is Ownable, ERC20Basic {
    using SafeMath for uint;

    mapping(address => uint) public balances;

    // additional variables for use if transaction fees ever became necessary
    uint public basisPointsRate = 0;
    uint public maximumFee = 0;

    /**
    * @dev Fix for the ERC20 short address attack.
    */
    modifier onlyPayloadSize(uint size) {
        require(!(msg.data.length < size + 4));
        _;
    }

    /**
    * @dev transfer token for a specified address
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    */
    function transfer(address _to, uint _value) public onlyPayloadSize(2 * 32) {
        uint fee = (_value.mul(basisPointsRate)).div(10000);
        if (fee > maximumFee) {
            fee = maximumFee;
        }
        uint sendAmount = _value.sub(fee);
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(sendAmount);
        if (fee > 0) {
            balances[owner] = balances[owner].add(fee);
            Transfer(msg.sender, owner, fee);
        }
        Transfer(msg.sender, _to, sendAmount);
    }

    /**
    * @dev Gets the balance of the specified address.
    * @param _owner The address to query the the balance of.
    * @return An uint representing the amount owned by the passed address.
    */
    function balanceOf(address _owner) public constant returns (uint balance) {
        return balances[_owner];
    }

}

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev Based oncode by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is BasicToken, ERC20 {

    mapping (address => mapping (address => uint)) public allowed;

    uint public constant MAX_UINT = 2**256 - 1;

    /**
    * @dev Transfer tokens from one address to another
    * @param _from address The address which you want to send tokens from
    * @param _to address The address which you want to transfer to
    * @param _value uint the amount of tokens to be transferred
    */
    function transferFrom(address _from, address _to, uint _value) public onlyPayloadSize(3 * 32) {
        var _allowance = allowed[_from][msg.sender];

        // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
        // if (_value > _allowance) throw;

        uint fee = (_value.mul(basisPointsRate)).div(10000);
        if (fee > maximumFee) {
            fee = maximumFee;
        }
        if (_allowance < MAX_UINT) {
            allowed[_from][msg.sender] = _allowance.sub(_value);
        }
        uint sendAmount = _value.sub(fee);
        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(sendAmount);
        if (fee > 0) {
            balances[owner] = balances[owner].add(fee);
            Transfer(_from, owner, fee);
        }
        Transfer(_from, _to, sendAmount);
    }

    /**
    * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
    * @param _spender The address which will spend the funds.
    * @param _value The amount of tokens to be spent.
    */
    function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) {

        // To change the approve amount you first have to reduce the addresses`
        //  allowance to zero by calling `approve(_spender, 0)` if it is not
        //  already 0 to mitigate the race condition described here:
        //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
        require(!((_value != 0) && (allowed[msg.sender][_spender] != 0)));

        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
    }

    /**
    * @dev Function to check the amount of tokens than an owner allowed to a spender.
    * @param _owner address The address which owns the funds.
    * @param _spender address The address which will spend the funds.
    * @return A uint specifying the amount of tokens still available for the spender.
    */
    function allowance(address _owner, address _spender) public constant returns (uint remaining) {
        return allowed[_owner][_spender];
    }

}


/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused);
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() onlyOwner whenNotPaused public {
    paused = true;
    Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused public {
    paused = false;
    Unpause();
  }
}

contract BlackList is Ownable, BasicToken {

    /////// Getters to allow the same blacklist to be used also by other contracts (including upgraded Tether) ///////
    function getBlackListStatus(address _maker) external constant returns (bool) {
        return isBlackListed[_maker];
    }

    function getOwner() external constant returns (address) {
        return owner;
    }

    mapping (address => bool) public isBlackListed;
    
    function addBlackList (address _evilUser) public onlyOwner {
        isBlackListed[_evilUser] = true;
        AddedBlackList(_evilUser);
    }

    function removeBlackList (address _clearedUser) public onlyOwner {
        isBlackListed[_clearedUser] = false;
        RemovedBlackList(_clearedUser);
    }

    function destroyBlackFunds (address _blackListedUser) public onlyOwner {
        require(isBlackListed[_blackListedUser]);
        uint dirtyFunds = balanceOf(_blackListedUser);
        balances[_blackListedUser] = 0;
        _totalSupply -= dirtyFunds;
        DestroyedBlackFunds(_blackListedUser, dirtyFunds);
    }

    event DestroyedBlackFunds(address _blackListedUser, uint _balance);

    event AddedBlackList(address _user);

    event RemovedBlackList(address _user);

}

contract UpgradedStandardToken is StandardToken{
    // those methods are called by the legacy contract
    // and they must ensure msg.sender to be the contract address
    function transferByLegacy(address from, address to, uint value) public;
    function transferFromByLegacy(address sender, address from, address spender, uint value) public;
    function approveByLegacy(address from, address spender, uint value) public;
}

contract TetherToken is Pausable, StandardToken, BlackList {

    string public name;
    string public symbol;
    uint public decimals;
    address public upgradedAddress;
    bool public deprecated;

    //  The contract can be initialized with a number of tokens
    //  All the tokens are deposited to the owner address
    //
    // @param _balance Initial supply of the contract
    // @param _name Token Name
    // @param _symbol Token symbol
    // @param _decimals Token decimals
    function TetherToken(uint _initialSupply, string _name, string _symbol, uint _decimals) public {
        _totalSupply = _initialSupply;
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
        balances[owner] = _initialSupply;
        deprecated = false;
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function transfer(address _to, uint _value) public whenNotPaused {
        require(!isBlackListed[msg.sender]);
        if (deprecated) {
            return UpgradedStandardToken(upgradedAddress).transferByLegacy(msg.sender, _to, _value);
        } else {
            return super.transfer(_to, _value);
        }
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function transferFrom(address _from, address _to, uint _value) public whenNotPaused {
        require(!isBlackListed[_from]);
        if (deprecated) {
            return UpgradedStandardToken(upgradedAddress).transferFromByLegacy(msg.sender, _from, _to, _value);
        } else {
            return super.transferFrom(_from, _to, _value);
        }
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function balanceOf(address who) public constant returns (uint) {
        if (deprecated) {
            return UpgradedStandardToken(upgradedAddress).balanceOf(who);
        } else {
            return super.balanceOf(who);
        }
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) {
        if (deprecated) {
            return UpgradedStandardToken(upgradedAddress).approveByLegacy(msg.sender, _spender, _value);
        } else {
            return super.approve(_spender, _value);
        }
    }

    // Forward ERC20 methods to upgraded contract if this one is deprecated
    function allowance(address _owner, address _spender) public constant returns (uint remaining) {
        if (deprecated) {
            return StandardToken(upgradedAddress).allowance(_owner, _spender);
        } else {
            return super.allowance(_owner, _spender);
        }
    }

    // deprecate current contract in favour of a new one
    function deprecate(address _upgradedAddress) public onlyOwner {
        deprecated = true;
        upgradedAddress = _upgradedAddress;
        Deprecate(_upgradedAddress);
    }

    // deprecate current contract if favour of a new one
    function totalSupply() public constant returns (uint) {
        if (deprecated) {
            return StandardToken(upgradedAddress).totalSupply();
        } else {
            return _totalSupply;
        }
    }

    // Issue a new amount of tokens
    // these tokens are deposited into the owner address
    //
    // @param _amount Number of tokens to be issued
    function issue(uint amount) public onlyOwner {
        require(_totalSupply + amount > _totalSupply);
        require(balances[owner] + amount > balances[owner]);

        balances[owner] += amount;
        _totalSupply += amount;
        Issue(amount);
    }

    // Redeem tokens.
    // These tokens are withdrawn from the owner address
    // if the balance must be enough to cover the redeem
    // or the call will fail.
    // @param _amount Number of tokens to be issued
    function redeem(uint amount) public onlyOwner {
        require(_totalSupply >= amount);
        require(balances[owner] >= amount);

        _totalSupply -= amount;
        balances[owner] -= amount;
        Redeem(amount);
    }

    function setParams(uint newBasisPoints, uint newMaxFee) public onlyOwner {
        // Ensure transparency by hardcoding limit beyond which fees can never be added
        require(newBasisPoints < 20);
        require(newMaxFee < 50);

        basisPointsRate = newBasisPoints;
        maximumFee = newMaxFee.mul(10**decimals);

        Params(basisPointsRate, maximumFee);
    }

    // Called when new token are issued
    event Issue(uint amount);

    // Called when tokens are redeemed
    event Redeem(uint amount);

    // Called when contract is deprecated
    event Deprecate(address newAddress);

    // Called if contract ever adds fees
    event Params(uint feeBasisPoints, uint maxFee);
}

# @version 0.2.4
# (c) Curve.Fi, 2020
# Pool for DAI/USDC/USDT

from vyper.interfaces import ERC20

interface CurveToken:
    def totalSupply() -> uint256: view
    def mint(_to: address, _value: uint256) -> bool: nonpayable
    def burnFrom(_to: address, _value: uint256) -> bool: nonpayable


# Events
event TokenExchange:
    buyer: indexed(address)
    sold_id: int128
    tokens_sold: uint256
    bought_id: int128
    tokens_bought: uint256


event AddLiquidity:
    provider: indexed(address)
    token_amounts: uint256[N_COINS]
    fees: uint256[N_COINS]
    invariant: uint256
    token_supply: uint256

event RemoveLiquidity:
    provider: indexed(address)
    token_amounts: uint256[N_COINS]
    fees: uint256[N_COINS]
    token_supply: uint256

event RemoveLiquidityOne:
    provider: indexed(address)
    token_amount: uint256
    coin_amount: uint256

event RemoveLiquidityImbalance:
    provider: indexed(address)
    token_amounts: uint256[N_COINS]
    fees: uint256[N_COINS]
    invariant: uint256
    token_supply: uint256

event CommitNewAdmin:
    deadline: indexed(uint256)
    admin: indexed(address)

event NewAdmin:
    admin: indexed(address)


event CommitNewFee:
    deadline: indexed(uint256)
    fee: uint256
    admin_fee: uint256

event NewFee:
    fee: uint256
    admin_fee: uint256

event RampA:
    old_A: uint256
    new_A: uint256
    initial_time: uint256
    future_time: uint256

event StopRampA:
    A: uint256
    t: uint256


# This can (and needs to) be changed at compile time
N_COINS: constant(int128) = 3  # <- change

FEE_DENOMINATOR: constant(uint256) = 10 ** 10
LENDING_PRECISION: constant(uint256) = 10 ** 18
PRECISION: constant(uint256) = 10 ** 18  # The precision to convert to
PRECISION_MUL: constant(uint256[N_COINS]) = [1, 1000000000000, 1000000000000]
RATES: constant(uint256[N_COINS]) = [1000000000000000000, 1000000000000000000000000000000, 1000000000000000000000000000000]
FEE_INDEX: constant(int128) = 2  # Which coin may potentially have fees (USDT)

MAX_ADMIN_FEE: constant(uint256) = 10 * 10 ** 9
MAX_FEE: constant(uint256) = 5 * 10 ** 9
MAX_A: constant(uint256) = 10 ** 6
MAX_A_CHANGE: constant(uint256) = 10

ADMIN_ACTIONS_DELAY: constant(uint256) = 3 * 86400
MIN_RAMP_TIME: constant(uint256) = 86400

coins: public(address[N_COINS])
balances: public(uint256[N_COINS])
fee: public(uint256)  # fee * 1e10
admin_fee: public(uint256)  # admin_fee * 1e10

owner: public(address)
token: CurveToken

initial_A: public(uint256)
future_A: public(uint256)
initial_A_time: public(uint256)
future_A_time: public(uint256)

admin_actions_deadline: public(uint256)
transfer_ownership_deadline: public(uint256)
future_fee: public(uint256)
future_admin_fee: public(uint256)
future_owner: public(address)

is_killed: bool
kill_deadline: uint256
KILL_DEADLINE_DT: constant(uint256) = 2 * 30 * 86400


@external
def __init__(
    _owner: address,
    _coins: address[N_COINS],
    _pool_token: address,
    _A: uint256,
    _fee: uint256,
    _admin_fee: uint256
):
    """
    @notice Contract constructor
    @param _owner Contract owner address
    @param _coins Addresses of ERC20 conracts of coins
    @param _pool_token Address of the token representing LP share
    @param _A Amplification coefficient multiplied by n * (n - 1)
    @param _fee Fee to charge for exchanges
    @param _admin_fee Admin fee
    """
    for i in range(N_COINS):
        assert _coins[i] != ZERO_ADDRESS
    self.coins = _coins
    self.initial_A = _A
    self.future_A = _A
    self.fee = _fee
    self.admin_fee = _admin_fee
    self.owner = _owner
    self.kill_deadline = block.timestamp + KILL_DEADLINE_DT
    self.token = CurveToken(_pool_token)


@view
@internal
def _A() -> uint256:
    """
    Handle ramping A up or down
    """
    t1: uint256 = self.future_A_time
    A1: uint256 = self.future_A

    if block.timestamp < t1:
        A0: uint256 = self.initial_A
        t0: uint256 = self.initial_A_time
        # Expressions in uint256 cannot have negative numbers, thus "if"
        if A1 > A0:
            return A0 + (A1 - A0) * (block.timestamp - t0) / (t1 - t0)
        else:
            return A0 - (A0 - A1) * (block.timestamp - t0) / (t1 - t0)

    else:  # when t1 == 0 or block.timestamp >= t1
        return A1


@view
@external
def A() -> uint256:
    return self._A()


@view
@internal
def _xp() -> uint256[N_COINS]:
    result: uint256[N_COINS] = RATES
    for i in range(N_COINS):
        result[i] = result[i] * self.balances[i] / LENDING_PRECISION
    return result


@pure
@internal
def _xp_mem(_balances: uint256[N_COINS]) -> uint256[N_COINS]:
    result: uint256[N_COINS] = RATES
    for i in range(N_COINS):
        result[i] = result[i] * _balances[i] / PRECISION
    return result


@pure
@internal
def get_D(xp: uint256[N_COINS], amp: uint256) -> uint256:
    S: uint256 = 0
    for _x in xp:
        S += _x
    if S == 0:
        return 0

    Dprev: uint256 = 0
    D: uint256 = S
    Ann: uint256 = amp * N_COINS
    for _i in range(255):
        D_P: uint256 = D
        for _x in xp:
            D_P = D_P * D / (_x * N_COINS)  # If division by 0, this will be borked: only withdrawal will work. And that is good
        Dprev = D
        D = (Ann * S + D_P * N_COINS) * D / ((Ann - 1) * D + (N_COINS + 1) * D_P)
        # Equality with the precision of 1
        if D > Dprev:
            if D - Dprev <= 1:
                break
        else:
            if Dprev - D <= 1:
                break
    return D


@view
@internal
def get_D_mem(_balances: uint256[N_COINS], amp: uint256) -> uint256:
    return self.get_D(self._xp_mem(_balances), amp)


@view
@external
def get_virtual_price() -> uint256:
    """
    Returns portfolio virtual price (for calculating profit)
    scaled up by 1e18
    """
    D: uint256 = self.get_D(self._xp(), self._A())
    # D is in the units similar to DAI (e.g. converted to precision 1e18)
    # When balanced, D = n * x_u - total virtual value of the portfolio
    token_supply: uint256 = self.token.totalSupply()
    return D * PRECISION / token_supply


@view
@external
def calc_token_amount(amounts: uint256[N_COINS], deposit: bool) -> uint256:
    """
    Simplified method to calculate addition or reduction in token supply at
    deposit or withdrawal without taking fees into account (but looking at
    slippage).
    Needed to prevent front-running, not for precise calculations!
    """
    _balances: uint256[N_COINS] = self.balances
    amp: uint256 = self._A()
    D0: uint256 = self.get_D_mem(_balances, amp)
    for i in range(N_COINS):
        if deposit:
            _balances[i] += amounts[i]
        else:
            _balances[i] -= amounts[i]
    D1: uint256 = self.get_D_mem(_balances, amp)
    token_amount: uint256 = self.token.totalSupply()
    diff: uint256 = 0
    if deposit:
        diff = D1 - D0
    else:
        diff = D0 - D1
    return diff * token_amount / D0


@external
@nonreentrant('lock')
def add_liquidity(amounts: uint256[N_COINS], min_mint_amount: uint256):
    assert not self.is_killed  # dev: is killed

    fees: uint256[N_COINS] = empty(uint256[N_COINS])
    _fee: uint256 = self.fee * N_COINS / (4 * (N_COINS - 1))
    _admin_fee: uint256 = self.admin_fee
    amp: uint256 = self._A()

    token_supply: uint256 = self.token.totalSupply()
    # Initial invariant
    D0: uint256 = 0
    old_balances: uint256[N_COINS] = self.balances
    if token_supply > 0:
        D0 = self.get_D_mem(old_balances, amp)
    new_balances: uint256[N_COINS] = old_balances

    for i in range(N_COINS):
        in_amount: uint256 = amounts[i]
        if token_supply == 0:
            assert in_amount > 0  # dev: initial deposit requires all coins
        in_coin: address = self.coins[i]

        # Take coins from the sender
        if in_amount > 0:
            if i == FEE_INDEX:
                in_amount = ERC20(in_coin).balanceOf(self)

            # "safeTransferFrom" which works for ERC20s which return bool or not
            _response: Bytes[32] = raw_call(
                in_coin,
                concat(
                    method_id("transferFrom(address,address,uint256)"),
                    convert(msg.sender, bytes32),
                    convert(self, bytes32),
                    convert(amounts[i], bytes32),
                ),
                max_outsize=32,
            )  # dev: failed transfer
            if len(_response) > 0:
                assert convert(_response, bool)  # dev: failed transfer

            if i == FEE_INDEX:
                in_amount = ERC20(in_coin).balanceOf(self) - in_amount

        new_balances[i] = old_balances[i] + in_amount

    # Invariant after change
    D1: uint256 = self.get_D_mem(new_balances, amp)
    assert D1 > D0

    # We need to recalculate the invariant accounting for fees
    # to calculate fair user's share
    D2: uint256 = D1
    if token_supply > 0:
        # Only account for fees if we are not the first to deposit
        for i in range(N_COINS):
            ideal_balance: uint256 = D1 * old_balances[i] / D0
            difference: uint256 = 0
            if ideal_balance > new_balances[i]:
                difference = ideal_balance - new_balances[i]
            else:
                difference = new_balances[i] - ideal_balance
            fees[i] = _fee * difference / FEE_DENOMINATOR
            self.balances[i] = new_balances[i] - (fees[i] * _admin_fee / FEE_DENOMINATOR)
            new_balances[i] -= fees[i]
        D2 = self.get_D_mem(new_balances, amp)
    else:
        self.balances = new_balances

    # Calculate, how much pool tokens to mint
    mint_amount: uint256 = 0
    if token_supply == 0:
        mint_amount = D1  # Take the dust if there was any
    else:
        mint_amount = token_supply * (D2 - D0) / D0

    assert mint_amount >= min_mint_amount, "Slippage screwed you"

    # Mint pool tokens
    self.token.mint(msg.sender, mint_amount)

    log AddLiquidity(msg.sender, amounts, fees, D1, token_supply + mint_amount)


@view
@internal
def get_y(i: int128, j: int128, x: uint256, xp_: uint256[N_COINS]) -> uint256:
    # x in the input is converted to the same price/precision

    assert i != j       # dev: same coin
    assert j >= 0       # dev: j below zero
    assert j < N_COINS  # dev: j above N_COINS

    # should be unreachable, but good for safety
    assert i >= 0
    assert i < N_COINS

    amp: uint256 = self._A()
    D: uint256 = self.get_D(xp_, amp)
    c: uint256 = D
    S_: uint256 = 0
    Ann: uint256 = amp * N_COINS

    _x: uint256 = 0
    for _i in range(N_COINS):
        if _i == i:
            _x = x
        elif _i != j:
            _x = xp_[_i]
        else:
            continue
        S_ += _x
        c = c * D / (_x * N_COINS)
    c = c * D / (Ann * N_COINS)
    b: uint256 = S_ + D / Ann  # - D
    y_prev: uint256 = 0
    y: uint256 = D
    for _i in range(255):
        y_prev = y
        y = (y*y + c) / (2 * y + b - D)
        # Equality with the precision of 1
        if y > y_prev:
            if y - y_prev <= 1:
                break
        else:
            if y_prev - y <= 1:
                break
    return y


@view
@external
def get_dy(i: int128, j: int128, dx: uint256) -> uint256:
    # dx and dy in c-units
    rates: uint256[N_COINS] = RATES
    xp: uint256[N_COINS] = self._xp()

    x: uint256 = xp[i] + (dx * rates[i] / PRECISION)
    y: uint256 = self.get_y(i, j, x, xp)
    dy: uint256 = (xp[j] - y - 1) * PRECISION / rates[j]
    _fee: uint256 = self.fee * dy / FEE_DENOMINATOR
    return dy - _fee


@view
@external
def get_dy_underlying(i: int128, j: int128, dx: uint256) -> uint256:
    # dx and dy in underlying units
    xp: uint256[N_COINS] = self._xp()
    precisions: uint256[N_COINS] = PRECISION_MUL

    x: uint256 = xp[i] + dx * precisions[i]
    y: uint256 = self.get_y(i, j, x, xp)
    dy: uint256 = (xp[j] - y - 1) / precisions[j]
    _fee: uint256 = self.fee * dy / FEE_DENOMINATOR
    return dy - _fee



@external
@nonreentrant('lock')
def exchange(i: int128, j: int128, dx: uint256, min_dy: uint256):
    assert not self.is_killed  # dev: is killed
    rates: uint256[N_COINS] = RATES

    old_balances: uint256[N_COINS] = self.balances
    xp: uint256[N_COINS] = self._xp_mem(old_balances)

    # Handling an unexpected charge of a fee on transfer (USDT, PAXG)
    dx_w_fee: uint256 = dx
    input_coin: address = self.coins[i]

    if i == FEE_INDEX:
        dx_w_fee = ERC20(input_coin).balanceOf(self)

    # "safeTransferFrom" which works for ERC20s which return bool or not
    _response: Bytes[32] = raw_call(
        input_coin,
        concat(
            method_id("transferFrom(address,address,uint256)"),
            convert(msg.sender, bytes32),
            convert(self, bytes32),
            convert(dx, bytes32),
        ),
        max_outsize=32,
    )  # dev: failed transfer
    if len(_response) > 0:
        assert convert(_response, bool)  # dev: failed transfer

    if i == FEE_INDEX:
        dx_w_fee = ERC20(input_coin).balanceOf(self) - dx_w_fee

    x: uint256 = xp[i] + dx_w_fee * rates[i] / PRECISION
    y: uint256 = self.get_y(i, j, x, xp)

    dy: uint256 = xp[j] - y - 1  # -1 just in case there were some rounding errors
    dy_fee: uint256 = dy * self.fee / FEE_DENOMINATOR

    # Convert all to real units
    dy = (dy - dy_fee) * PRECISION / rates[j]
    assert dy >= min_dy, "Exchange resulted in fewer coins than expected"

    dy_admin_fee: uint256 = dy_fee * self.admin_fee / FEE_DENOMINATOR
    dy_admin_fee = dy_admin_fee * PRECISION / rates[j]

    # Change balances exactly in same way as we change actual ERC20 coin amounts
    self.balances[i] = old_balances[i] + dx_w_fee
    # When rounding errors happen, we undercharge admin fee in favor of LP
    self.balances[j] = old_balances[j] - dy - dy_admin_fee

    # "safeTransfer" which works for ERC20s which return bool or not
    _response = raw_call(
        self.coins[j],
        concat(
            method_id("transfer(address,uint256)"),
            convert(msg.sender, bytes32),
            convert(dy, bytes32),
        ),
        max_outsize=32,
    )  # dev: failed transfer
    if len(_response) > 0:
        assert convert(_response, bool)  # dev: failed transfer

    log TokenExchange(msg.sender, i, dx, j, dy)


@external
@nonreentrant('lock')
def remove_liquidity(_amount: uint256, min_amounts: uint256[N_COINS]):
    total_supply: uint256 = self.token.totalSupply()
    amounts: uint256[N_COINS] = empty(uint256[N_COINS])
    fees: uint256[N_COINS] = empty(uint256[N_COINS])  # Fees are unused but we've got them historically in event

    for i in range(N_COINS):
        value: uint256 = self.balances[i] * _amount / total_supply
        assert value >= min_amounts[i], "Withdrawal resulted in fewer coins than expected"
        self.balances[i] -= value
        amounts[i] = value

        # "safeTransfer" which works for ERC20s which return bool or not
        _response: Bytes[32] = raw_call(
            self.coins[i],
            concat(
                method_id("transfer(address,uint256)"),
                convert(msg.sender, bytes32),
                convert(value, bytes32),
            ),
            max_outsize=32,
        )  # dev: failed transfer
        if len(_response) > 0:
            assert convert(_response, bool)  # dev: failed transfer

    self.token.burnFrom(msg.sender, _amount)  # dev: insufficient funds

    log RemoveLiquidity(msg.sender, amounts, fees, total_supply - _amount)


@external
@nonreentrant('lock')
def remove_liquidity_imbalance(amounts: uint256[N_COINS], max_burn_amount: uint256):
    assert not self.is_killed  # dev: is killed

    token_supply: uint256 = self.token.totalSupply()
    assert token_supply != 0  # dev: zero total supply
    _fee: uint256 = self.fee * N_COINS / (4 * (N_COINS - 1))
    _admin_fee: uint256 = self.admin_fee
    amp: uint256 = self._A()

    old_balances: uint256[N_COINS] = self.balances
    new_balances: uint256[N_COINS] = old_balances
    D0: uint256 = self.get_D_mem(old_balances, amp)
    for i in range(N_COINS):
        new_balances[i] -= amounts[i]
    D1: uint256 = self.get_D_mem(new_balances, amp)
    fees: uint256[N_COINS] = empty(uint256[N_COINS])
    for i in range(N_COINS):
        ideal_balance: uint256 = D1 * old_balances[i] / D0
        difference: uint256 = 0
        if ideal_balance > new_balances[i]:
            difference = ideal_balance - new_balances[i]
        else:
            difference = new_balances[i] - ideal_balance
        fees[i] = _fee * difference / FEE_DENOMINATOR
        self.balances[i] = new_balances[i] - (fees[i] * _admin_fee / FEE_DENOMINATOR)
        new_balances[i] -= fees[i]
    D2: uint256 = self.get_D_mem(new_balances, amp)

    token_amount: uint256 = (D0 - D2) * token_supply / D0
    assert token_amount != 0  # dev: zero tokens burned
    token_amount += 1  # In case of rounding errors - make it unfavorable for the "attacker"
    assert token_amount <= max_burn_amount, "Slippage screwed you"

    self.token.burnFrom(msg.sender, token_amount)  # dev: insufficient funds
    for i in range(N_COINS):
        if amounts[i] != 0:

            # "safeTransfer" which works for ERC20s which return bool or not
            _response: Bytes[32] = raw_call(
                self.coins[i],
                concat(
                    method_id("transfer(address,uint256)"),
                    convert(msg.sender, bytes32),
                    convert(amounts[i], bytes32),
                ),
                max_outsize=32,
            )  # dev: failed transfer
            if len(_response) > 0:
                assert convert(_response, bool)  # dev: failed transfer

    log RemoveLiquidityImbalance(msg.sender, amounts, fees, D1, token_supply - token_amount)


@view
@internal
def get_y_D(A_: uint256, i: int128, xp: uint256[N_COINS], D: uint256) -> uint256:
    """
    Calculate x[i] if one reduces D from being calculated for xp to D

    Done by solving quadratic equation iteratively.
    x_1**2 + x1 * (sum' - (A*n**n - 1) * D / (A * n**n)) = D ** (n + 1) / (n ** (2 * n) * prod' * A)
    x_1**2 + b*x_1 = c

    x_1 = (x_1**2 + c) / (2*x_1 + b)
    """
    # x in the input is converted to the same price/precision

    assert i >= 0  # dev: i below zero
    assert i < N_COINS  # dev: i above N_COINS

    c: uint256 = D
    S_: uint256 = 0
    Ann: uint256 = A_ * N_COINS

    _x: uint256 = 0
    for _i in range(N_COINS):
        if _i != i:
            _x = xp[_i]
        else:
            continue
        S_ += _x
        c = c * D / (_x * N_COINS)
    c = c * D / (Ann * N_COINS)
    b: uint256 = S_ + D / Ann
    y_prev: uint256 = 0
    y: uint256 = D
    for _i in range(255):
        y_prev = y
        y = (y*y + c) / (2 * y + b - D)
        # Equality with the precision of 1
        if y > y_prev:
            if y - y_prev <= 1:
                break
        else:
            if y_prev - y <= 1:
                break
    return y


@view
@internal
def _calc_withdraw_one_coin(_token_amount: uint256, i: int128) -> (uint256, uint256):
    # First, need to calculate
    # * Get current D
    # * Solve Eqn against y_i for D - _token_amount
    amp: uint256 = self._A()
    _fee: uint256 = self.fee * N_COINS / (4 * (N_COINS - 1))
    precisions: uint256[N_COINS] = PRECISION_MUL
    total_supply: uint256 = self.token.totalSupply()

    xp: uint256[N_COINS] = self._xp()

    D0: uint256 = self.get_D(xp, amp)
    D1: uint256 = D0 - _token_amount * D0 / total_supply
    xp_reduced: uint256[N_COINS] = xp

    new_y: uint256 = self.get_y_D(amp, i, xp, D1)
    dy_0: uint256 = (xp[i] - new_y) / precisions[i]  # w/o fees

    for j in range(N_COINS):
        dx_expected: uint256 = 0
        if j == i:
            dx_expected = xp[j] * D1 / D0 - new_y
        else:
            dx_expected = xp[j] - xp[j] * D1 / D0
        xp_reduced[j] -= _fee * dx_expected / FEE_DENOMINATOR

    dy: uint256 = xp_reduced[i] - self.get_y_D(amp, i, xp_reduced, D1)
    dy = (dy - 1) / precisions[i]  # Withdraw less to account for rounding errors

    return dy, dy_0 - dy


@view
@external
def calc_withdraw_one_coin(_token_amount: uint256, i: int128) -> uint256:
    return self._calc_withdraw_one_coin(_token_amount, i)[0]


@external
@nonreentrant('lock')
def remove_liquidity_one_coin(_token_amount: uint256, i: int128, min_amount: uint256):
    """
    Remove _amount of liquidity all in a form of coin i
    """
    assert not self.is_killed  # dev: is killed

    dy: uint256 = 0
    dy_fee: uint256 = 0
    dy, dy_fee = self._calc_withdraw_one_coin(_token_amount, i)
    assert dy >= min_amount, "Not enough coins removed"

    self.balances[i] -= (dy + dy_fee * self.admin_fee / FEE_DENOMINATOR)
    self.token.burnFrom(msg.sender, _token_amount)  # dev: insufficient funds

    # "safeTransfer" which works for ERC20s which return bool or not
    _response: Bytes[32] = raw_call(
        self.coins[i],
        concat(
            method_id("transfer(address,uint256)"),
            convert(msg.sender, bytes32),
            convert(dy, bytes32),
        ),
        max_outsize=32,
    )  # dev: failed transfer
    if len(_response) > 0:
        assert convert(_response, bool)  # dev: failed transfer

    log RemoveLiquidityOne(msg.sender, _token_amount, dy)


### Admin functions ###
@external
def ramp_A(_future_A: uint256, _future_time: uint256):
    assert msg.sender == self.owner  # dev: only owner
    assert block.timestamp >= self.initial_A_time + MIN_RAMP_TIME
    assert _future_time >= block.timestamp + MIN_RAMP_TIME  # dev: insufficient time

    _initial_A: uint256 = self._A()
    assert (_future_A > 0) and (_future_A < MAX_A)
    assert ((_future_A >= _initial_A) and (_future_A <= _initial_A * MAX_A_CHANGE)) or\
           ((_future_A < _initial_A) and (_future_A * MAX_A_CHANGE >= _initial_A))
    self.initial_A = _initial_A
    self.future_A = _future_A
    self.initial_A_time = block.timestamp
    self.future_A_time = _future_time

    log RampA(_initial_A, _future_A, block.timestamp, _future_time)


@external
def stop_ramp_A():
    assert msg.sender == self.owner  # dev: only owner

    current_A: uint256 = self._A()
    self.initial_A = current_A
    self.future_A = current_A
    self.initial_A_time = block.timestamp
    self.future_A_time = block.timestamp
    # now (block.timestamp < t1) is always False, so we return saved A

    log StopRampA(current_A, block.timestamp)


@external
def commit_new_fee(new_fee: uint256, new_admin_fee: uint256):
    assert msg.sender == self.owner  # dev: only owner
    assert self.admin_actions_deadline == 0  # dev: active action
    assert new_fee <= MAX_FEE  # dev: fee exceeds maximum
    assert new_admin_fee <= MAX_ADMIN_FEE  # dev: admin fee exceeds maximum

    _deadline: uint256 = block.timestamp + ADMIN_ACTIONS_DELAY
    self.admin_actions_deadline = _deadline
    self.future_fee = new_fee
    self.future_admin_fee = new_admin_fee

    log CommitNewFee(_deadline, new_fee, new_admin_fee)


@external
def apply_new_fee():
    assert msg.sender == self.owner  # dev: only owner
    assert block.timestamp >= self.admin_actions_deadline  # dev: insufficient time
    assert self.admin_actions_deadline != 0  # dev: no active action

    self.admin_actions_deadline = 0
    _fee: uint256 = self.future_fee
    _admin_fee: uint256 = self.future_admin_fee
    self.fee = _fee
    self.admin_fee = _admin_fee

    log NewFee(_fee, _admin_fee)


@external
def revert_new_parameters():
    assert msg.sender == self.owner  # dev: only owner

    self.admin_actions_deadline = 0


@external
def commit_transfer_ownership(_owner: address):
    assert msg.sender == self.owner  # dev: only owner
    assert self.transfer_ownership_deadline == 0  # dev: active transfer

    _deadline: uint256 = block.timestamp + ADMIN_ACTIONS_DELAY
    self.transfer_ownership_deadline = _deadline
    self.future_owner = _owner

    log CommitNewAdmin(_deadline, _owner)


@external
def apply_transfer_ownership():
    assert msg.sender == self.owner  # dev: only owner
    assert block.timestamp >= self.transfer_ownership_deadline  # dev: insufficient time
    assert self.transfer_ownership_deadline != 0  # dev: no active transfer

    self.transfer_ownership_deadline = 0
    _owner: address = self.future_owner
    self.owner = _owner

    log NewAdmin(_owner)


@external
def revert_transfer_ownership():
    assert msg.sender == self.owner  # dev: only owner

    self.transfer_ownership_deadline = 0


@view
@external
def admin_balances(i: uint256) -> uint256:
    return ERC20(self.coins[i]).balanceOf(self) - self.balances[i]


@external
def withdraw_admin_fees():
    assert msg.sender == self.owner  # dev: only owner

    for i in range(N_COINS):
        c: address = self.coins[i]
        value: uint256 = ERC20(c).balanceOf(self) - self.balances[i]
        if value > 0:
            # "safeTransfer" which works for ERC20s which return bool or not
            _response: Bytes[32] = raw_call(
                c,
                concat(
                    method_id("transfer(address,uint256)"),
                    convert(msg.sender, bytes32),
                    convert(value, bytes32),
                ),
                max_outsize=32,
            )  # dev: failed transfer
            if len(_response) > 0:
                assert convert(_response, bool)  # dev: failed transfer


@external
def donate_admin_fees():
    assert msg.sender == self.owner  # dev: only owner
    for i in range(N_COINS):
        self.balances[i] = ERC20(self.coins[i]).balanceOf(self)


@external
def kill_me():
    assert msg.sender == self.owner  # dev: only owner
    assert self.kill_deadline > block.timestamp  # dev: deadline has passed
    self.is_killed = True


@external
def unkill_me():
    assert msg.sender == self.owner  # dev: only owner
    self.is_killed = False

pragma solidity ^0.4.24;

// File: zos-lib/contracts/upgradeability/Proxy.sol

/**
 * @title Proxy
 * @dev Implements delegation of calls to other contracts, with proper
 * forwarding of return values and bubbling of failures.
 * It defines a fallback function that delegates all calls to the address
 * returned by the abstract _implementation() internal function.
 */
contract Proxy {
  /**
   * @dev Fallback function.
   * Implemented entirely in `_fallback`.
   */
  function () payable external {
    _fallback();
  }

  /**
   * @return The Address of the implementation.
   */
  function _implementation() internal view returns (address);

  /**
   * @dev Delegates execution to an implementation contract.
   * This is a low level function that doesn't return to its internal call site.
   * It will return to the external caller whatever the implementation returns.
   * @param implementation Address to delegate.
   */
  function _delegate(address implementation) internal {
    assembly {
      // Copy msg.data. We take full control of memory in this inline assembly
      // block because it will not return to Solidity code. We overwrite the
      // Solidity scratch pad at memory position 0.
      calldatacopy(0, 0, calldatasize)

      // Call the implementation.
      // out and outsize are 0 because we don't know the size yet.
      let result := delegatecall(gas, implementation, 0, calldatasize, 0, 0)

      // Copy the returned data.
      returndatacopy(0, 0, returndatasize)

      switch result
      // delegatecall returns 0 on error.
      case 0 { revert(0, returndatasize) }
      default { return(0, returndatasize) }
    }
  }

  /**
   * @dev Function that is run as the first thing in the fallback function.
   * Can be redefined in derived contracts to add functionality.
   * Redefinitions must call super._willFallback().
   */
  function _willFallback() internal {
  }

  /**
   * @dev fallback implementation.
   * Extracted to enable manual triggering.
   */
  function _fallback() internal {
    _willFallback();
    _delegate(_implementation());
  }
}

// File: openzeppelin-solidity/contracts/AddressUtils.sol

/**
 * Utility library of inline functions on addresses
 */
library AddressUtils {

  /**
   * Returns whether 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) {
    uint256 size;
    // 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 then.
    // solium-disable-next-line security/no-inline-assembly
    assembly { size := extcodesize(addr) }
    return size > 0;
  }

}

// File: zos-lib/contracts/upgradeability/UpgradeabilityProxy.sol

/**
 * @title UpgradeabilityProxy
 * @dev This contract implements a proxy that allows to change the
 * implementation address to which it will delegate.
 * Such a change is called an implementation upgrade.
 */
contract UpgradeabilityProxy is Proxy {
  /**
   * @dev Emitted when the implementation is upgraded.
   * @param implementation Address of the new implementation.
   */
  event Upgraded(address implementation);

  /**
   * @dev Storage slot with the address of the current implementation.
   * This is the keccak-256 hash of "org.zeppelinos.proxy.implementation", and is
   * validated in the constructor.
   */
  bytes32 private constant IMPLEMENTATION_SLOT = 0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3;

  /**
   * @dev Contract constructor.
   * @param _implementation Address of the initial implementation.
   */
  constructor(address _implementation) public {
    assert(IMPLEMENTATION_SLOT == keccak256("org.zeppelinos.proxy.implementation"));

    _setImplementation(_implementation);
  }

  /**
   * @dev Returns the current implementation.
   * @return Address of the current implementation
   */
  function _implementation() internal view returns (address impl) {
    bytes32 slot = IMPLEMENTATION_SLOT;
    assembly {
      impl := sload(slot)
    }
  }

  /**
   * @dev Upgrades the proxy to a new implementation.
   * @param newImplementation Address of the new implementation.
   */
  function _upgradeTo(address newImplementation) internal {
    _setImplementation(newImplementation);
    emit Upgraded(newImplementation);
  }

  /**
   * @dev Sets the implementation address of the proxy.
   * @param newImplementation Address of the new implementation.
   */
  function _setImplementation(address newImplementation) private {
    require(AddressUtils.isContract(newImplementation), "Cannot set a proxy implementation to a non-contract address");

    bytes32 slot = IMPLEMENTATION_SLOT;

    assembly {
      sstore(slot, newImplementation)
    }
  }
}

// File: zos-lib/contracts/upgradeability/AdminUpgradeabilityProxy.sol

/**
 * @title AdminUpgradeabilityProxy
 * @dev This contract combines an upgradeability proxy with an authorization
 * mechanism for administrative tasks.
 * All external functions in this contract must be guarded by the
 * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity
 * feature proposal that would enable this to be done automatically.
 */
contract AdminUpgradeabilityProxy is UpgradeabilityProxy {
  /**
   * @dev Emitted when the administration has been transferred.
   * @param previousAdmin Address of the previous admin.
   * @param newAdmin Address of the new admin.
   */
  event AdminChanged(address previousAdmin, address newAdmin);

  /**
   * @dev Storage slot with the admin of the contract.
   * This is the keccak-256 hash of "org.zeppelinos.proxy.admin", and is
   * validated in the constructor.
   */
  bytes32 private constant ADMIN_SLOT = 0x10d6a54a4754c8869d6886b5f5d7fbfa5b4522237ea5c60d11bc4e7a1ff9390b;

  /**
   * @dev Modifier to check whether the `msg.sender` is the admin.
   * If it is, it will run the function. Otherwise, it will delegate the call
   * to the implementation.
   */
  modifier ifAdmin() {
    if (msg.sender == _admin()) {
      _;
    } else {
      _fallback();
    }
  }

  /**
   * Contract constructor.
   * It sets the `msg.sender` as the proxy administrator.
   * @param _implementation address of the initial implementation.
   */
  constructor(address _implementation) UpgradeabilityProxy(_implementation) public {
    assert(ADMIN_SLOT == keccak256("org.zeppelinos.proxy.admin"));

    _setAdmin(msg.sender);
  }

  /**
   * @return The address of the proxy admin.
   */
  function admin() external view ifAdmin returns (address) {
    return _admin();
  }

  /**
   * @return The address of the implementation.
   */
  function implementation() external view ifAdmin returns (address) {
    return _implementation();
  }

  /**
   * @dev Changes the admin of the proxy.
   * Only the current admin can call this function.
   * @param newAdmin Address to transfer proxy administration to.
   */
  function changeAdmin(address newAdmin) external ifAdmin {
    require(newAdmin != address(0), "Cannot change the admin of a proxy to the zero address");
    emit AdminChanged(_admin(), newAdmin);
    _setAdmin(newAdmin);
  }

  /**
   * @dev Upgrade the backing implementation of the proxy.
   * Only the admin can call this function.
   * @param newImplementation Address of the new implementation.
   */
  function upgradeTo(address newImplementation) external ifAdmin {
    _upgradeTo(newImplementation);
  }

  /**
   * @dev Upgrade the backing implementation of the proxy and call a function
   * on the new implementation.
   * This is useful to initialize the proxied contract.
   * @param newImplementation Address of the new implementation.
   * @param data Data to send as msg.data in the low level call.
   * It should include the signature and the parameters of the function to be
   * called, as described in
   * https://solidity.readthedocs.io/en/develop/abi-spec.html#function-selector-and-argument-encoding.
   */
  function upgradeToAndCall(address newImplementation, bytes data) payable external ifAdmin {
    _upgradeTo(newImplementation);
    require(address(this).call.value(msg.value)(data));
  }

  /**
   * @return The admin slot.
   */
  function _admin() internal view returns (address adm) {
    bytes32 slot = ADMIN_SLOT;
    assembly {
      adm := sload(slot)
    }
  }

  /**
   * @dev Sets the address of the proxy admin.
   * @param newAdmin Address of the new proxy admin.
   */
  function _setAdmin(address newAdmin) internal {
    bytes32 slot = ADMIN_SLOT;

    assembly {
      sstore(slot, newAdmin)
    }
  }

  /**
   * @dev Only fall back when the sender is not the admin.
   */
  function _willFallback() internal {
    require(msg.sender != _admin(), "Cannot call fallback function from the proxy admin");
    super._willFallback();
  }
}

// File: contracts/FiatTokenProxy.sol

/**
* Copyright CENTRE SECZ 2018
*
* Permission is hereby granted, free of charge, to any person obtaining a copy 
* of this software and associated documentation files (the "Software"), to deal 
* in the Software without restriction, including without limitation the rights 
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
* copies of the Software, and to permit persons to whom the Software is furnished to 
* do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all 
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

pragma solidity ^0.4.24;


/**
 * @title FiatTokenProxy
 * @dev This contract proxies FiatToken calls and enables FiatToken upgrades
*/ 
contract FiatTokenProxy is AdminUpgradeabilityProxy {
    constructor(address _implementation) public AdminUpgradeabilityProxy(_implementation) {
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
pragma abicoder v2;
import "./utils/UserProxyStorage.sol";
import "./utils/Multicall.sol";
/**
 * @dev UserProxy contract
 */
contract UserProxy is Multicall {
    // Below are the variables which consume storage slots.
    address public operator;
    string public version; // Current version of the contract
    address private nominatedOperator;
    // Operator events
    event OperatorNominated(address indexed newOperator);
    event OperatorChanged(address indexed oldOperator, address indexed newOperator);
    event SetAMMStatus(bool enable);
    event UpgradeAMMWrapper(address newAMMWrapper);
    event SetPMMStatus(bool enable);
    event UpgradePMM(address newPMM);
    event SetRFQStatus(bool enable);
    event UpgradeRFQ(address newRFQ);
    event SetRFQv2Status(bool enable);
    event UpgradeRFQv2(address newRFQv2);
    event SetLimitOrderStatus(bool enable);
    event UpgradeLimitOrder(address newLimitOrder);
    receive() external payable {}
    /************************************************************
     *          Access control and ownership management          *
     *************************************************************/
    modifier onlyOperator() {
        require(operator == msg.sender, "UserProxy: not the operator");
        _;
    }
    function nominateNewOperator(address _newOperator) external onlyOperator {
        require(_newOperator != address(0), "UserProxy: operator can not be zero address");
        nominatedOperator = _newOperator;
        emit OperatorNominated(_newOperator);
    }
    function acceptOwnership() external {
        require(msg.sender == nominatedOperator, "UserProxy: not nominated");
        emit OperatorChanged(operator, nominatedOperator);
        operator = nominatedOperator;
        nominatedOperator = address(0);
    }
    /************************************************************
     *              Constructor and init functions               *
     *************************************************************/
    /// @dev Replacing constructor and initialize the contract. This function should only be called once.
    function initialize(address _operator) external {
        require(keccak256(abi.encodePacked(version)) == keccak256(abi.encodePacked("")), "UserProxy: not upgrading from empty");
        require(_operator != address(0), "UserProxy: operator can not be zero address");
        operator = _operator;
        // Upgrade version
        version = "5.3.0";
    }
    /************************************************************
     *                     Getter functions                      *
     *************************************************************/
    function ammWrapperAddr() public view returns (address) {
        return AMMWrapperStorage.getStorage().ammWrapperAddr;
    }
    function isAMMEnabled() public view returns (bool) {
        return AMMWrapperStorage.getStorage().isEnabled;
    }
    function pmmAddr() public view returns (address) {
        return PMMStorage.getStorage().pmmAddr;
    }
    function isPMMEnabled() public view returns (bool) {
        return PMMStorage.getStorage().isEnabled;
    }
    function rfqAddr() public view returns (address) {
        return RFQStorage.getStorage().rfqAddr;
    }
    function isRFQEnabled() public view returns (bool) {
        return RFQStorage.getStorage().isEnabled;
    }
    function rfqv2Addr() public view returns (address) {
        return RFQv2Storage.getStorage().rfqv2Addr;
    }
    function isRFQv2Enabled() public view returns (bool) {
        return RFQv2Storage.getStorage().isEnabled;
    }
    function limitOrderAddr() public view returns (address) {
        return LimitOrderStorage.getStorage().limitOrderAddr;
    }
    function isLimitOrderEnabled() public view returns (bool) {
        return LimitOrderStorage.getStorage().isEnabled;
    }
    /************************************************************
     *           Management functions for Operator               *
     *************************************************************/
    function setAMMStatus(bool _enable) public onlyOperator {
        AMMWrapperStorage.getStorage().isEnabled = _enable;
        emit SetAMMStatus(_enable);
    }
    function upgradeAMMWrapper(address _newAMMWrapperAddr, bool _enable) external onlyOperator {
        AMMWrapperStorage.getStorage().ammWrapperAddr = _newAMMWrapperAddr;
        AMMWrapperStorage.getStorage().isEnabled = _enable;
        emit UpgradeAMMWrapper(_newAMMWrapperAddr);
        emit SetAMMStatus(_enable);
    }
    function setPMMStatus(bool _enable) public onlyOperator {
        PMMStorage.getStorage().isEnabled = _enable;
        emit SetPMMStatus(_enable);
    }
    function upgradePMM(address _newPMMAddr, bool _enable) external onlyOperator {
        PMMStorage.getStorage().pmmAddr = _newPMMAddr;
        PMMStorage.getStorage().isEnabled = _enable;
        emit UpgradePMM(_newPMMAddr);
        emit SetPMMStatus(_enable);
    }
    function setRFQStatus(bool _enable) public onlyOperator {
        RFQStorage.getStorage().isEnabled = _enable;
        emit SetRFQStatus(_enable);
    }
    function upgradeRFQ(address _newRFQAddr, bool _enable) external onlyOperator {
        RFQStorage.getStorage().rfqAddr = _newRFQAddr;
        RFQStorage.getStorage().isEnabled = _enable;
        emit UpgradeRFQ(_newRFQAddr);
        emit SetRFQStatus(_enable);
    }
    function setRFQv2Status(bool _enable) public onlyOperator {
        RFQv2Storage.getStorage().isEnabled = _enable;
        emit SetRFQv2Status(_enable);
    }
    function upgradeRFQv2(address _newRFQv2Addr, bool _enable) external onlyOperator {
        RFQv2Storage.getStorage().rfqv2Addr = _newRFQv2Addr;
        RFQv2Storage.getStorage().isEnabled = _enable;
        emit UpgradeRFQv2(_newRFQv2Addr);
        emit SetRFQv2Status(_enable);
    }
    function setLimitOrderStatus(bool _enable) public onlyOperator {
        LimitOrderStorage.getStorage().isEnabled = _enable;
        emit SetLimitOrderStatus(_enable);
    }
    function upgradeLimitOrder(address _newLimitOrderAddr, bool _enable) external onlyOperator {
        LimitOrderStorage.getStorage().limitOrderAddr = _newLimitOrderAddr;
        LimitOrderStorage.getStorage().isEnabled = _enable;
        emit UpgradeLimitOrder(_newLimitOrderAddr);
        emit SetLimitOrderStatus(_enable);
    }
    /************************************************************
     *                   External functions                      *
     *************************************************************/
    /**
     * @dev proxy the call to AMM
     */
    function toAMM(bytes calldata _payload) external payable {
        require(isAMMEnabled(), "UserProxy: AMM is disabled");
        (bool callSucceed, ) = ammWrapperAddr().call{ value: msg.value }(_payload);
        if (!callSucceed) {
            // revert with data from last call
            assembly {
                let ptr := mload(0x40)
                let size := returndatasize()
                returndatacopy(ptr, 0, size)
                revert(ptr, size)
            }
        }
    }
    /**
     * @dev proxy the call to PMM
     */
    function toPMM(bytes calldata _payload) external payable {
        require(isPMMEnabled(), "UserProxy: PMM is disabled");
        require(msg.sender == tx.origin, "UserProxy: only EOA");
        (bool callSucceed, ) = pmmAddr().call{ value: msg.value }(_payload);
        if (!callSucceed) {
            // revert with data from last call
            assembly {
                let ptr := mload(0x40)
                let size := returndatasize()
                returndatacopy(ptr, 0, size)
                revert(ptr, size)
            }
        }
    }
    /**
     * @dev proxy the call to RFQ
     */
    function toRFQ(bytes calldata _payload) external payable {
        require(isRFQEnabled(), "UserProxy: RFQ is disabled");
        require(msg.sender == tx.origin, "UserProxy: only EOA");
        (bool callSucceed, ) = rfqAddr().call{ value: msg.value }(_payload);
        if (!callSucceed) {
            // revert with data from last call
            assembly {
                let ptr := mload(0x40)
                let size := returndatasize()
                returndatacopy(ptr, 0, size)
                revert(ptr, size)
            }
        }
    }
    /**
     * @dev proxy the call to RFQv2
     */
    function toRFQv2(bytes calldata _payload) external payable {
        require(isRFQv2Enabled(), "UserProxy: RFQv2 is disabled");
        require(msg.sender == tx.origin, "UserProxy: only EOA");
        (bool callSucceed, ) = rfqv2Addr().call{ value: msg.value }(_payload);
        if (!callSucceed) {
            // revert with data from last call
            assembly {
                let ptr := mload(0x40)
                let size := returndatasize()
                returndatacopy(ptr, 0, size)
                revert(ptr, size)
            }
        }
    }
    /**
     * @dev proxy the call to Limit Order
     */
    function toLimitOrder(bytes calldata _payload) external {
        require(isLimitOrderEnabled(), "UserProxy: Limit Order is disabled");
        require(msg.sender == tx.origin, "UserProxy: only EOA");
        (bool callSucceed, ) = limitOrderAddr().call(_payload);
        if (!callSucceed) {
            // revert with data from last call
            assembly {
                let ptr := mload(0x40)
                let size := returndatasize()
                returndatacopy(ptr, 0, size)
                revert(ptr, size)
            }
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;
library AMMWrapperStorage {
    bytes32 private constant STORAGE_SLOT = 0xbf49677e3150252dfa801a673d2d5ec21eaa360a4674864e55e79041e3f65a6b;
    /// @dev Storage bucket for proxy contract.
    struct Storage {
        // The address of the AMMWrapper contract.
        address ammWrapperAddr;
        // Is AMM enabled
        bool isEnabled;
    }
    /// @dev Get the storage bucket for this contract.
    function getStorage() internal pure returns (Storage storage stor) {
        assert(STORAGE_SLOT == bytes32(uint256(keccak256("userproxy.ammwrapper.storage")) - 1));
        bytes32 slot = STORAGE_SLOT;
        // Dip into assembly to change the slot pointed to by the local
        // variable `stor`.
        // See https://solidity.readthedocs.io/en/v0.6.8/assembly.html?highlight=slot#access-to-external-variables-functions-and-libraries
        assembly {
            stor.slot := slot
        }
    }
}
library PMMStorage {
    bytes32 private constant STORAGE_SLOT = 0x8f135983375ba6442123d61647e7325c1753eabc2e038e44d3b888a970def89a;
    /// @dev Storage bucket for proxy contract.
    struct Storage {
        // The address of the PMM contract.
        address pmmAddr;
        // Is PMM enabled
        bool isEnabled;
    }
    /// @dev Get the storage bucket for this contract.
    function getStorage() internal pure returns (Storage storage stor) {
        assert(STORAGE_SLOT == bytes32(uint256(keccak256("userproxy.pmm.storage")) - 1));
        bytes32 slot = STORAGE_SLOT;
        // Dip into assembly to change the slot pointed to by the local
        // variable `stor`.
        // See https://solidity.readthedocs.io/en/v0.6.8/assembly.html?highlight=slot#access-to-external-variables-functions-and-libraries
        assembly {
            stor.slot := slot
        }
    }
}
library RFQStorage {
    bytes32 private constant STORAGE_SLOT = 0x857df08bd185dc66e3cc5e11acb4e1dd65290f3fee6426f52f84e8faccf229cf;
    /// @dev Storage bucket for proxy contract.
    struct Storage {
        // The address of the RFQ contract.
        address rfqAddr;
        // Is RFQ enabled
        bool isEnabled;
    }
    /// @dev Get the storage bucket for this contract.
    function getStorage() internal pure returns (Storage storage stor) {
        assert(STORAGE_SLOT == bytes32(uint256(keccak256("userproxy.rfq.storage")) - 1));
        bytes32 slot = STORAGE_SLOT;
        // Dip into assembly to change the slot pointed to by the local
        // variable `stor`.
        // See https://solidity.readthedocs.io/en/v0.6.8/assembly.html?highlight=slot#access-to-external-variables-functions-and-libraries
        assembly {
            stor.slot := slot
        }
    }
}
library RFQv2Storage {
    bytes32 private constant STORAGE_SLOT = 0xd5f1768ede616e352f32123fd6fe01064898ae4e55a2678c79b8ad79680ff744;
    /// @dev Storage bucket for proxy contract.
    struct Storage {
        // The address of the RFQv2 contract.
        address rfqv2Addr;
        // Is RFQv2 enabled
        bool isEnabled;
    }
    /// @dev Get the storage bucket for this contract.
    function getStorage() internal pure returns (Storage storage stor) {
        assert(STORAGE_SLOT == bytes32(uint256(keccak256("userproxy.rfqv2.storage")) - 1));
        bytes32 slot = STORAGE_SLOT;
        // Dip into assembly to change the slot pointed to by the local
        // variable `stor`.
        // See https://solidity.readthedocs.io/en/v0.6.8/assembly.html?highlight=slot#access-to-external-variables-functions-and-libraries
        assembly {
            stor.slot := slot
        }
    }
}
library LimitOrderStorage {
    bytes32 private constant STORAGE_SLOT = 0xf1a59a985b4002cdf0db464f05bed7182ee06372a999d820ea1883b8bf067ce5;
    /// @dev Storage bucket for proxy contract.
    struct Storage {
        // The address of the Limit Order contract.
        address limitOrderAddr;
        // Is Limit Order enabled
        bool isEnabled;
    }
    /// @dev Get the storage bucket for this contract.
    function getStorage() internal pure returns (Storage storage stor) {
        assert(STORAGE_SLOT == bytes32(uint256(keccak256("userproxy.limitorder.storage")) - 1));
        bytes32 slot = STORAGE_SLOT;
        // Dip into assembly to change the slot pointed to by the local
        // variable `stor`.
        // See https://solidity.readthedocs.io/en/v0.6.8/assembly.html?highlight=slot#access-to-external-variables-functions-and-libraries
        assembly {
            stor.slot := slot
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
pragma abicoder v2;
import "../interfaces/IMulticall.sol";
// Modified from https://github.com/Uniswap/uniswap-v3-periphery/blob/v1.1.1/contracts/base/Multicall.sol
abstract contract Multicall is IMulticall {
    function multicall(bytes[] calldata data, bool revertOnFail) external override returns (bool[] memory successes, bytes[] memory results) {
        successes = new bool[](data.length);
        results = new bytes[](data.length);
        for (uint256 i = 0; i < data.length; ++i) {
            (bool success, bytes memory result) = address(this).delegatecall(data[i]);
            successes[i] = success;
            results[i] = result;
            if (!success) {
                // Get failed reason
                string memory revertReason;
                if (result.length < 68) {
                    revertReason = "Delegatecall failed";
                } else {
                    assembly {
                        result := add(result, 0x04)
                    }
                    revertReason = abi.decode(result, (string));
                }
                if (revertOnFail) {
                    revert(revertReason);
                }
                emit MulticallFailure(i, revertReason);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.7.0;
pragma abicoder v2;
interface IMulticall {
    event MulticallFailure(uint256 index, string reason);
    function multicall(bytes[] calldata data, bool revertOnFail) external returns (bool[] memory successes, bytes[] memory results);
}

// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts/utils/Address.sol
pragma solidity ^0.6.2;
/**
 * @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 in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }
    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// File: contracts/upgrade_proxy/Proxy.sol
pragma solidity ^0.6.0;
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 * 
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 * 
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     * 
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())
            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())
            switch result
            // delegatecall returns 0 on error.
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }
    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal virtual view returns (address);
    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     * 
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal {
        _beforeFallback();
        _delegate(_implementation());
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback () payable external {
        _fallback();
    }
    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive () payable external {
        _fallback();
    }
    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     * 
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {
    }
}
// File: contracts/upgrade_proxy/UpgradeableProxy.sol
pragma solidity ^0.6.0;
/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 * 
 * Upgradeability is only provided internally through {_upgradeTo}. For an externally upgradeable proxy see
 * {TransparentUpgradeableProxy}.
 */
contract UpgradeableProxy is Proxy {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     * 
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) public payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _setImplementation(_logic);
        if(_data.length > 0) {
            // solhint-disable-next-line avoid-low-level-calls
            (bool success,) = _logic.delegatecall(_data);
            require(success);
        }
    }
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);
    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal override view returns (address impl) {
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            impl := sload(slot)
        }
    }
    /**
     * @dev Upgrades the proxy to a new implementation.
     * 
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }
    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "UpgradeableProxy: new implementation is not a contract");
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newImplementation)
        }
    }
}
// File: contracts/upgrade_proxy/TransparentUpgradeableProxy.sol
pragma solidity ^0.6.0;
/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 * 
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 * 
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 * 
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 * 
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is UpgradeableProxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {UpgradeableProxy-constructor}.
     */
    constructor(address _logic, address _admin, bytes memory _data) public payable UpgradeableProxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _setAdmin(_admin);
    }
    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);
    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _admin()) {
            _;
        } else {
            _fallback();
        }
    }
    /**
     * @dev Returns the current admin.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     * 
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address) {
        return _admin();
    }
    /**
     * @dev Returns the current implementation.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     * 
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address) {
        return _implementation();
    }
    /**
     * @dev Changes the admin of the proxy.
     * 
     * Emits an {AdminChanged} event.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external ifAdmin {
        require(newAdmin != address(0), "TransparentUpgradeableProxy: new admin is the zero address");
        emit AdminChanged(_admin(), newAdmin);
        _setAdmin(newAdmin);
    }
    /**
     * @dev Upgrade the implementation of the proxy.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeTo(newImplementation);
    }
    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     * 
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable ifAdmin {
        _upgradeTo(newImplementation);
        // solhint-disable-next-line avoid-low-level-calls
        (bool success,) = newImplementation.delegatecall(data);
        require(success);
    }
    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view returns (address adm) {
        bytes32 slot = _ADMIN_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            adm := sload(slot)
        }
    }
    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        bytes32 slot = _ADMIN_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newAdmin)
        }
    }
    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal override virtual {
        require(msg.sender != _admin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
import "./interfaces/IPermanentStorage.sol";
import "./utils/PSStorage.sol";
contract PermanentStorage is IPermanentStorage {
    // Constants do not have storage slot.
    bytes32 public constant curveTokenIndexStorageId = 0xf4c750cdce673f6c35898d215e519b86e3846b1f0532fb48b84fe9d80f6de2fc; // keccak256("curveTokenIndex")
    bytes32 public constant transactionSeenStorageId = 0x695d523b8578c6379a2121164fd8de334b9c5b6b36dff5408bd4051a6b1704d0; // keccak256("transactionSeen")
    bytes32 public constant relayerValidStorageId = 0x2c97779b4deaf24e9d46e02ec2699240a957d92782b51165b93878b09dd66f61; // keccak256("relayerValid")
    bytes32 public constant allowFillSeenStorageId = 0x808188d002c47900fbb4e871d29754afff429009f6684806712612d807395dd8; // keccak256("allowFillSeen")
    // New supported Curve pools
    address public constant CURVE_renBTC_POOL = 0x93054188d876f558f4a66B2EF1d97d16eDf0895B;
    address public constant CURVE_sBTC_POOL = 0x7fC77b5c7614E1533320Ea6DDc2Eb61fa00A9714;
    address public constant CURVE_hBTC_POOL = 0x4CA9b3063Ec5866A4B82E437059D2C43d1be596F;
    address public constant CURVE_sETH_POOL = 0xc5424B857f758E906013F3555Dad202e4bdB4567;
    // Curve coins
    address private constant ETH = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    address private constant renBTC = 0xEB4C2781e4ebA804CE9a9803C67d0893436bB27D;
    address private constant wBTC = 0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599;
    address private constant sBTC = 0xfE18be6b3Bd88A2D2A7f928d00292E7a9963CfC6;
    address private constant hBTC = 0x0316EB71485b0Ab14103307bf65a021042c6d380;
    address private constant sETH = 0x5e74C9036fb86BD7eCdcb084a0673EFc32eA31cb;
    // Below are the variables which consume storage slots.
    address public operator;
    string public version; // Current version of the contract
    mapping(bytes32 => mapping(address => bool)) private permission;
    address private nominatedOperator;
    /************************************************************
     *          Access control and ownership management          *
     *************************************************************/
    modifier onlyOperator() {
        require(operator == msg.sender, "PermanentStorage: not the operator");
        _;
    }
    modifier isPermitted(bytes32 _storageId, address _role) {
        require(permission[_storageId][_role], "PermanentStorage: has no permission");
        _;
    }
    function nominateNewOperator(address _newOperator) external onlyOperator {
        require(_newOperator != address(0), "PermanentStorage: operator can not be zero address");
        nominatedOperator = _newOperator;
        emit OperatorNominated(_newOperator);
    }
    function acceptOwnership() external {
        require(msg.sender == nominatedOperator, "PermanentStorage: not nominated");
        emit OperatorChanged(operator, nominatedOperator);
        operator = nominatedOperator;
        nominatedOperator = address(0);
    }
    /// @dev Set permission for entity to write certain storage.
    function setPermission(
        bytes32 _storageId,
        address _role,
        bool _enabled
    ) external onlyOperator {
        if (_enabled) {
            require(
                (_role == operator) || (_role == ammWrapperAddr()) || (_role == rfqAddr()) || (_role == rfqv2Addr()) || (_role == limitOrderAddr()),
                "PermanentStorage: not a valid role"
            );
        }
        permission[_storageId][_role] = _enabled;
        emit SetPermission(_storageId, _role, _enabled);
    }
    /************************************************************
     *              Constructor and init functions               *
     *************************************************************/
    /// @dev Replacing constructor and initialize the contract. This function should only be called once.
    function initialize(address _operator) external {
        require(keccak256(abi.encodePacked(version)) == keccak256(abi.encodePacked("")), "PermanentStorage: not upgrading from empty");
        require(_operator != address(0), "PermanentStorage: operator can not be zero address");
        operator = _operator;
        // Upgrade version
        version = "5.4.0";
    }
    /************************************************************
     *                     Getter functions                      *
     *************************************************************/
    function hasPermission(bytes32 _storageId, address _role) external view override returns (bool) {
        return permission[_storageId][_role];
    }
    function ammWrapperAddr() public view override returns (address) {
        return PSStorage.getStorage().ammWrapperAddr;
    }
    function pmmAddr() public view override returns (address) {
        return PSStorage.getStorage().pmmAddr;
    }
    function rfqAddr() public view override returns (address) {
        return PSStorage.getStorage().rfqAddr;
    }
    function rfqv2Addr() public view override returns (address) {
        return PSStorage.getStorage().rfqv2Addr;
    }
    function limitOrderAddr() public view override returns (address) {
        return PSStorage.getStorage().limitOrderAddr;
    }
    function wethAddr() external view override returns (address) {
        return PSStorage.getStorage().wethAddr;
    }
    function getCurvePoolInfo(
        address _makerAddr,
        address _takerAssetAddr,
        address _makerAssetAddr
    )
        external
        view
        override
        returns (
            int128 takerAssetIndex,
            int128 makerAssetIndex,
            uint16 swapMethod,
            bool supportGetDx
        )
    {
        // underlying_coins
        int128 i = AMMWrapperStorage.getStorage().curveTokenIndexes[_makerAddr][_takerAssetAddr];
        int128 j = AMMWrapperStorage.getStorage().curveTokenIndexes[_makerAddr][_makerAssetAddr];
        supportGetDx = AMMWrapperStorage.getStorage().curveSupportGetDx[_makerAddr];
        swapMethod = 0;
        if (i != 0 && j != 0) {
            // in underlying_coins list
            takerAssetIndex = i;
            makerAssetIndex = j;
            // exchange_underlying
            swapMethod = 2;
        } else {
            // in coins list
            int128 iWrapped = AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[_makerAddr][_takerAssetAddr];
            int128 jWrapped = AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[_makerAddr][_makerAssetAddr];
            if (iWrapped != 0 && jWrapped != 0) {
                takerAssetIndex = iWrapped;
                makerAssetIndex = jWrapped;
                // exchange
                swapMethod = 1;
            } else {
                revert("PermanentStorage: invalid pair");
            }
        }
        return (takerAssetIndex, makerAssetIndex, swapMethod, supportGetDx);
    }
    function isAMMTransactionSeen(bytes32 _transactionHash) external view override returns (bool) {
        return AMMWrapperStorage.getStorage().transactionSeen[_transactionHash];
    }
    function isRFQTransactionSeen(bytes32 _transactionHash) external view override returns (bool) {
        return RFQStorage.getStorage().transactionSeen[_transactionHash];
    }
    function isRFQOfferFilled(bytes32 _offerHash) external view override returns (bool) {
        return RFQv2Storage.getStorage().filledOffer[_offerHash];
    }
    function isLimitOrderTransactionSeen(bytes32 _transactionHash) external view override returns (bool) {
        return LimitOrderStorage.getStorage().transactionSeen[_transactionHash];
    }
    function isLimitOrderAllowFillSeen(bytes32 _allowFillHash) external view override returns (bool) {
        return LimitOrderStorage.getStorage().allowFillSeen[_allowFillHash];
    }
    function isRelayerValid(address _relayer) external view override returns (bool) {
        return AMMWrapperStorage.getStorage().relayerValid[_relayer];
    }
    /************************************************************
     *           Management functions for Operator               *
     *************************************************************/
    /// @dev Update AMMWrapper contract address.
    function upgradeAMMWrapper(address _newAMMWrapper) external onlyOperator {
        PSStorage.getStorage().ammWrapperAddr = _newAMMWrapper;
        emit UpgradeAMMWrapper(_newAMMWrapper);
    }
    /// @dev Update PMM contract address.
    function upgradePMM(address _newPMM) external onlyOperator {
        PSStorage.getStorage().pmmAddr = _newPMM;
        emit UpgradePMM(_newPMM);
    }
    /// @dev Update RFQ contract address.
    function upgradeRFQ(address _newRFQ) external onlyOperator {
        PSStorage.getStorage().rfqAddr = _newRFQ;
        emit UpgradeRFQ(_newRFQ);
    }
    /// @dev Update RFQv2 contract address.
    function upgradeRFQv2(address _newRFQv2) external onlyOperator {
        PSStorage.getStorage().rfqv2Addr = _newRFQv2;
        emit UpgradeRFQv2(_newRFQv2);
    }
    /// @dev Update Limit Order contract address.
    function upgradeLimitOrder(address _newLimitOrder) external onlyOperator {
        PSStorage.getStorage().limitOrderAddr = _newLimitOrder;
        emit UpgradeLimitOrder(_newLimitOrder);
    }
    /// @dev Update WETH contract address.
    function upgradeWETH(address _newWETH) external onlyOperator {
        PSStorage.getStorage().wethAddr = _newWETH;
        emit UpgradeWETH(_newWETH);
    }
    /************************************************************
     *                   External functions                      *
     *************************************************************/
    function setCurvePoolInfo(
        address _makerAddr,
        address[] calldata _underlyingCoins,
        address[] calldata _coins,
        bool _supportGetDx
    ) external override isPermitted(curveTokenIndexStorageId, msg.sender) {
        int128 underlyingCoinsLength = int128(_underlyingCoins.length);
        for (int128 i = 0; i < underlyingCoinsLength; ++i) {
            address assetAddr = _underlyingCoins[uint256(i)];
            // underlying coins for original DAI, USDC, TUSD
            AMMWrapperStorage.getStorage().curveTokenIndexes[_makerAddr][assetAddr] = i + 1; // Start the index from 1
        }
        int128 coinsLength = int128(_coins.length);
        for (int128 i = 0; i < coinsLength; ++i) {
            address assetAddr = _coins[uint256(i)];
            // wrapped coins for cDAI, cUSDC, yDAI, yUSDC, yTUSD, yBUSD
            AMMWrapperStorage.getStorage().curveWrappedTokenIndexes[_makerAddr][assetAddr] = i + 1; // Start the index from 1
        }
        AMMWrapperStorage.getStorage().curveSupportGetDx[_makerAddr] = _supportGetDx;
        emit SetCurvePoolInfo(_makerAddr, _underlyingCoins, _coins, _supportGetDx);
    }
    function setAMMTransactionSeen(bytes32 _transactionHash) external override isPermitted(transactionSeenStorageId, msg.sender) {
        require(!AMMWrapperStorage.getStorage().transactionSeen[_transactionHash], "PermanentStorage: transaction seen before");
        AMMWrapperStorage.getStorage().transactionSeen[_transactionHash] = true;
    }
    function setRFQTransactionSeen(bytes32 _transactionHash) external override isPermitted(transactionSeenStorageId, msg.sender) {
        require(!RFQStorage.getStorage().transactionSeen[_transactionHash], "PermanentStorage: transaction seen before");
        RFQStorage.getStorage().transactionSeen[_transactionHash] = true;
    }
    function setRFQOfferFilled(bytes32 _offerHash) external override isPermitted(transactionSeenStorageId, msg.sender) {
        require(!RFQv2Storage.getStorage().filledOffer[_offerHash], "PermanentStorage: offer already filled");
        RFQv2Storage.getStorage().filledOffer[_offerHash] = true;
    }
    function setLimitOrderTransactionSeen(bytes32 _transactionHash) external override isPermitted(transactionSeenStorageId, msg.sender) {
        require(!LimitOrderStorage.getStorage().transactionSeen[_transactionHash], "PermanentStorage: transaction seen before");
        LimitOrderStorage.getStorage().transactionSeen[_transactionHash] = true;
    }
    function setLimitOrderAllowFillSeen(bytes32 _allowFillHash) external override isPermitted(allowFillSeenStorageId, msg.sender) {
        require(!LimitOrderStorage.getStorage().allowFillSeen[_allowFillHash], "PermanentStorage: allow fill seen before");
        LimitOrderStorage.getStorage().allowFillSeen[_allowFillHash] = true;
    }
    function setRelayersValid(address[] calldata _relayers, bool[] calldata _isValids) external override isPermitted(relayerValidStorageId, msg.sender) {
        require(_relayers.length == _isValids.length, "PermanentStorage: inputs length mismatch");
        for (uint256 i = 0; i < _relayers.length; ++i) {
            AMMWrapperStorage.getStorage().relayerValid[_relayers[i]] = _isValids[i];
            emit SetRelayerValid(_relayers[i], _isValids[i]);
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.7.0;
interface IPermanentStorage {
    // Operator events
    event OperatorNominated(address indexed newOperator);
    event OperatorChanged(address indexed oldOperator, address indexed newOperator);
    event SetPermission(bytes32 storageId, address role, bool enabled);
    event UpgradeAMMWrapper(address newAMMWrapper);
    event UpgradePMM(address newPMM);
    event UpgradeRFQ(address newRFQ);
    event UpgradeRFQv2(address newRFQv2);
    event UpgradeLimitOrder(address newLimitOrder);
    event UpgradeWETH(address newWETH);
    event SetCurvePoolInfo(address makerAddr, address[] underlyingCoins, address[] coins, bool supportGetD);
    event SetRelayerValid(address relayer, bool valid);
    function hasPermission(bytes32 _storageId, address _role) external view returns (bool);
    function ammWrapperAddr() external view returns (address);
    function pmmAddr() external view returns (address);
    function rfqAddr() external view returns (address);
    function rfqv2Addr() external view returns (address);
    function limitOrderAddr() external view returns (address);
    function wethAddr() external view returns (address);
    function getCurvePoolInfo(
        address _makerAddr,
        address _takerAssetAddr,
        address _makerAssetAddr
    )
        external
        view
        returns (
            int128 takerAssetIndex,
            int128 makerAssetIndex,
            uint16 swapMethod,
            bool supportGetDx
        );
    function setCurvePoolInfo(
        address _makerAddr,
        address[] calldata _underlyingCoins,
        address[] calldata _coins,
        bool _supportGetDx
    ) external;
    function isAMMTransactionSeen(bytes32 _transactionHash) external view returns (bool);
    function isRFQTransactionSeen(bytes32 _transactionHash) external view returns (bool);
    function isRFQOfferFilled(bytes32 _offerHash) external view returns (bool);
    function isLimitOrderTransactionSeen(bytes32 _transactionHash) external view returns (bool);
    function isLimitOrderAllowFillSeen(bytes32 _allowFillHash) external view returns (bool);
    function isRelayerValid(address _relayer) external view returns (bool);
    function setAMMTransactionSeen(bytes32 _transactionHash) external;
    function setRFQTransactionSeen(bytes32 _transactionHash) external;
    function setRFQOfferFilled(bytes32 _offerHash) external;
    function setLimitOrderTransactionSeen(bytes32 _transactionHash) external;
    function setLimitOrderAllowFillSeen(bytes32 _allowFillHash) external;
    function setRelayersValid(address[] memory _relayers, bool[] memory _isValids) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;
library PSStorage {
    bytes32 private constant STORAGE_SLOT = 0x92dd52b981a2dd69af37d8a3febca29ed6a974aede38ae66e4ef773173aba471;
    struct Storage {
        address ammWrapperAddr;
        address pmmAddr;
        address wethAddr;
        address rfqAddr;
        address limitOrderAddr;
        address rfqv2Addr;
    }
    /// @dev Get the storage bucket for this contract.
    function getStorage() internal pure returns (Storage storage stor) {
        assert(STORAGE_SLOT == bytes32(uint256(keccak256("permanent.storage.storage")) - 1));
        bytes32 slot = STORAGE_SLOT;
        // Dip into assembly to change the slot pointed to by the local
        // variable `stor`.
        // See https://solidity.readthedocs.io/en/v0.6.8/assembly.html?highlight=slot#access-to-external-variables-functions-and-libraries
        assembly {
            stor.slot := slot
        }
    }
}
library AMMWrapperStorage {
    bytes32 private constant STORAGE_SLOT = 0xd38d862c9fa97c2fa857a46e08022d272a3579c114ca4f335f1e5fcb692c045e;
    struct Storage {
        mapping(bytes32 => bool) transactionSeen;
        // curve pool => underlying token address => underlying token index
        mapping(address => mapping(address => int128)) curveTokenIndexes;
        mapping(address => bool) relayerValid;
        // 5.1.0 appended storage
        // curve pool => wrapped token address => wrapped token index
        mapping(address => mapping(address => int128)) curveWrappedTokenIndexes;
        mapping(address => bool) curveSupportGetDx;
    }
    /// @dev Get the storage bucket for this contract.
    function getStorage() internal pure returns (Storage storage stor) {
        assert(STORAGE_SLOT == bytes32(uint256(keccak256("permanent.ammwrapper.storage")) - 1));
        bytes32 slot = STORAGE_SLOT;
        // Dip into assembly to change the slot pointed to by the local
        // variable `stor`.
        // See https://solidity.readthedocs.io/en/v0.6.8/assembly.html?highlight=slot#access-to-external-variables-functions-and-libraries
        assembly {
            stor.slot := slot
        }
    }
}
library RFQStorage {
    bytes32 private constant STORAGE_SLOT = 0x9174e76494cfb023ddc1eb0effb6c12e107165382bbd0ecfddbc38ea108bbe52;
    struct Storage {
        mapping(bytes32 => bool) transactionSeen;
    }
    /// @dev Get the storage bucket for this contract.
    function getStorage() internal pure returns (Storage storage stor) {
        assert(STORAGE_SLOT == bytes32(uint256(keccak256("permanent.rfq.storage")) - 1));
        bytes32 slot = STORAGE_SLOT;
        // Dip into assembly to change the slot pointed to by the local
        // variable `stor`.
        // See https://solidity.readthedocs.io/en/v0.6.8/assembly.html?highlight=slot#access-to-external-variables-functions-and-libraries
        assembly {
            stor.slot := slot
        }
    }
}
library RFQv2Storage {
    bytes32 private constant STORAGE_SLOT = 0x080acc42eac0383f7fcd5637f944d2e6a75ec0034a43cf5966b3e1fbe75ceddf;
    struct Storage {
        mapping(bytes32 => bool) filledOffer;
    }
    /// @dev Get the storage bucket for this contract.
    function getStorage() internal pure returns (Storage storage stor) {
        assert(STORAGE_SLOT == bytes32(uint256(keccak256("permanent.rfqv2.storage")) - 1));
        bytes32 slot = STORAGE_SLOT;
        // Dip into assembly to change the slot pointed to by the local
        // variable `stor`.
        // See https://solidity.readthedocs.io/en/v0.6.8/assembly.html?highlight=slot#access-to-external-variables-functions-and-libraries
        assembly {
            stor.slot := slot
        }
    }
}
library LimitOrderStorage {
    bytes32 private constant STORAGE_SLOT = 0xb1b5d1092eed9d9f9f6bdd5bf9fe04f7537770f37e1d84ac8960cc3acb80615c;
    struct Storage {
        mapping(bytes32 => bool) transactionSeen;
        mapping(bytes32 => bool) allowFillSeen;
    }
    /// @dev Get the storage bucket for this contract.
    function getStorage() internal pure returns (Storage storage stor) {
        assert(STORAGE_SLOT == bytes32(uint256(keccak256("permanent.limitorder.storage")) - 1));
        bytes32 slot = STORAGE_SLOT;
        // Dip into assembly to change the slot pointed to by the local
        // variable `stor`.
        // See https://solidity.readthedocs.io/en/v0.6.8/assembly.html?highlight=slot#access-to-external-variables-functions-and-libraries
        assembly {
            stor.slot := slot
        }
    }
}

// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts/math/SafeMath.sol


pragma solidity ^0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


pragma solidity ^0.6.0;

/**
 * @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);
}

// File: contracts/interface/IAllowanceTarget.sol

pragma solidity ^0.6.0;

interface IAllowanceTarget {
    function setSpenderWithTimelock(address _newSpender) external;
    function completeSetSpender() external;
    function executeCall(address payable _target, bytes calldata _callData) external returns (bytes memory resultData);
    function teardown() external;
}

// File: contracts/Spender.sol


pragma solidity ^0.6.5;




/**
 * @dev Spender contract
 */
contract Spender {
    using SafeMath for uint256;

    // Constants do not have storage slot.
    address private constant ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    address private constant ZERO_ADDRESS = address(0);
    uint256 constant private TIME_LOCK_DURATION = 1 days;

    // Below are the variables which consume storage slots.
    address public operator;
    address public allowanceTarget;
    mapping(address => bool) private authorized;
    mapping(address => bool) private tokenBlacklist;
    uint256 public numPendingAuthorized;
    mapping(uint256 => address) public pendingAuthorized;
    uint256 public timelockExpirationTime;
    uint256 public contractDeployedTime;
    bool public timelockActivated;



    /************************************************************
    *          Access control and ownership management          *
    *************************************************************/
    modifier onlyOperator() {
        require(operator == msg.sender, "Spender: not the operator");
        _;
    }

    modifier onlyAuthorized() {
        require(authorized[msg.sender], "Spender: not authorized");
        _;
    }

    function transferOwnership(address _newOperator) external onlyOperator {
        require(_newOperator != address(0), "Spender: operator can not be zero address");
        operator = _newOperator;
    }


    /************************************************************
    *                    Timelock management                    *
    *************************************************************/
    /// @dev Everyone can activate timelock after the contract has been deployed for more than 1 day.
    function activateTimelock() external {
        bool canActivate = block.timestamp.sub(contractDeployedTime) > 1 days;
        require(canActivate && ! timelockActivated, "Spender: can not activate timelock yet or has been activated");
        timelockActivated = true;
    }


    /************************************************************
    *              Constructor and init functions               *
    *************************************************************/
    constructor(address _operator) public {
        require(_operator != address(0), "Spender: _operator should not be 0");

        // Set operator
        operator = _operator;
        timelockActivated = false;
        contractDeployedTime = block.timestamp;
    }

    function setAllowanceTarget(address _allowanceTarget) external onlyOperator {
        require(allowanceTarget == address(0), "Spender: can not reset allowance target");

        // Set allowanceTarget
        allowanceTarget = _allowanceTarget;
    }



    /************************************************************
    *          AllowanceTarget interaction functions            *
    *************************************************************/
    function setNewSpender(address _newSpender) external onlyOperator {
        IAllowanceTarget(allowanceTarget).setSpenderWithTimelock(_newSpender);
    }

    function teardownAllowanceTarget() external onlyOperator {
        IAllowanceTarget(allowanceTarget).teardown();
    }



    /************************************************************
    *           Whitelist and blacklist functions               *
    *************************************************************/
    function isBlacklisted(address _tokenAddr) external view returns (bool) {
        return tokenBlacklist[_tokenAddr];
    }

    function blacklist(address[] calldata _tokenAddrs, bool[] calldata _isBlacklisted) external onlyOperator {
        require(_tokenAddrs.length == _isBlacklisted.length, "Spender: length mismatch");
        for (uint256 i = 0; i < _tokenAddrs.length; i++) {
            tokenBlacklist[_tokenAddrs[i]] = _isBlacklisted[i];
        }
    }
    
    function isAuthorized(address _caller) external view returns (bool) {
        return authorized[_caller];
    }

    function authorize(address[] calldata _pendingAuthorized) external onlyOperator {
        require(_pendingAuthorized.length > 0, "Spender: authorize list is empty");
        require(numPendingAuthorized == 0 && timelockExpirationTime == 0, "Spender: an authorize current in progress");

        if (timelockActivated) {
            numPendingAuthorized = _pendingAuthorized.length;
            for (uint256 i = 0; i < _pendingAuthorized.length; i++) {
                require(_pendingAuthorized[i] != address(0), "Spender: can not authorize zero address");
                pendingAuthorized[i] = _pendingAuthorized[i];
            }
            timelockExpirationTime = now + TIME_LOCK_DURATION;
        } else {
            for (uint256 i = 0; i < _pendingAuthorized.length; i++) {
                require(_pendingAuthorized[i] != address(0), "Spender: can not authorize zero address");
                authorized[_pendingAuthorized[i]] = true;
            }
        }
    }

    function completeAuthorize() external {
        require(timelockExpirationTime != 0, "Spender: no pending authorize");
        require(now >= timelockExpirationTime, "Spender: time lock not expired yet");

        for (uint256 i = 0; i < numPendingAuthorized; i++) {
            authorized[pendingAuthorized[i]] = true;
            delete pendingAuthorized[i];
        }
        timelockExpirationTime = 0;
        numPendingAuthorized = 0;
    }

    function deauthorize(address[] calldata _deauthorized) external onlyOperator {
        for (uint256 i = 0; i < _deauthorized.length; i++) {
            authorized[_deauthorized[i]] = false;
        }
    }


    /************************************************************
    *                   External functions                      *
    *************************************************************/
    /// @dev Spend tokens on user's behalf. Only an authority can call this.
    /// @param _user The user to spend token from.
    /// @param _tokenAddr The address of the token.
    /// @param _amount Amount to spend.
    function spendFromUser(address _user, address _tokenAddr, uint256 _amount) external onlyAuthorized {
        require(! tokenBlacklist[_tokenAddr], "Spender: token is blacklisted");

        if (_tokenAddr != ETH_ADDRESS && _tokenAddr != ZERO_ADDRESS) {

            uint256 balanceBefore = IERC20(_tokenAddr).balanceOf(msg.sender);
            (bool callSucceed, ) = address(allowanceTarget).call(
                abi.encodeWithSelector(
                    IAllowanceTarget.executeCall.selector,
                    _tokenAddr,
                    abi.encodeWithSelector(
                        IERC20.transferFrom.selector,
                        _user,
                        msg.sender,
                        _amount
                    )
                )
            );
            require(callSucceed, "Spender: ERC20 transferFrom failed");
            // Check balance
            uint256 balanceAfter = IERC20(_tokenAddr).balanceOf(msg.sender);
            require(balanceAfter.sub(balanceBefore) == _amount, "Spender: ERC20 transferFrom result mismatch");

        }
    }
}

// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts/utils/Address.sol


pragma solidity ^0.6.2;

/**
 * @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 in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: contracts/interface/IAllowanceTarget.sol

pragma solidity ^0.6.0;

interface IAllowanceTarget {
    function setSpenderWithTimelock(address _newSpender) external;
    function completeSetSpender() external;
    function executeCall(address payable _target, bytes calldata _callData) external returns (bytes memory resultData);
    function teardown() external;
}

// File: contracts/AllowanceTarget.sol


pragma solidity ^0.6.5;



/**
 * @dev AllowanceTarget contract
 */
contract AllowanceTarget is IAllowanceTarget {
    using Address for address;

    uint256 constant private TIME_LOCK_DURATION = 1 days;

    address public spender;
    address public newSpender;
    uint256 public timelockExpirationTime;

    modifier onlySpender() {
        require(spender == msg.sender, "AllowanceTarget: not the spender");
        _;
    }


    constructor(address _spender) public {
        require(_spender != address(0), "AllowanceTarget: _spender should not be 0");

        // Set spender
        spender = _spender;
    }


    function setSpenderWithTimelock(address _newSpender) override external onlySpender {
        require(_newSpender.isContract(), "AllowanceTarget: new spender not a contract");
        require(newSpender == address(0) && timelockExpirationTime == 0, "AllowanceTarget: SetSpender in progress");

        timelockExpirationTime = now + TIME_LOCK_DURATION;
        newSpender = _newSpender;
    }

    function completeSetSpender() override external {
        require(timelockExpirationTime != 0, "AllowanceTarget: no pending SetSpender");
        require(now >= timelockExpirationTime, "AllowanceTarget: time lock not expired yet");

        // Set new spender
        spender = newSpender;
        // Reset
        timelockExpirationTime = 0;
        newSpender = address(0);
    }


    function teardown() override external onlySpender {
        selfdestruct(payable(spender));
    }


    /// @dev Execute an arbitrary call. Only an authority can call this.
    /// @param target The call target.
    /// @param callData The call data.
    /// @return resultData The data returned by the call.
    function executeCall(
        address payable target,
        bytes calldata callData
    )
        override
        external
        onlySpender
        returns (bytes memory resultData)
    {
        bool success;
        (success, resultData) = target.call(callData);
        if (!success) {
            // Get the error message returned
            assembly {
                let ptr := mload(0x40)
                let size := returndatasize()
                returndatacopy(ptr, 0, size)
                revert(ptr, size)
            }
        }
    }
}

/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
import { EIP712Domain } from "./EIP712Domain.sol"; // solhint-disable-line no-unused-import
import { Blacklistable } from "../v1/Blacklistable.sol"; // solhint-disable-line no-unused-import
import { FiatTokenV1 } from "../v1/FiatTokenV1.sol"; // solhint-disable-line no-unused-import
import { FiatTokenV2 } from "./FiatTokenV2.sol"; // solhint-disable-line no-unused-import
import { FiatTokenV2_1 } from "./FiatTokenV2_1.sol";
import { EIP712 } from "../util/EIP712.sol";
// solhint-disable func-name-mixedcase
/**
 * @title FiatToken V2.2
 * @notice ERC20 Token backed by fiat reserves, version 2.2
 */
contract FiatTokenV2_2 is FiatTokenV2_1 {
    /**
     * @notice Initialize v2.2
     * @param accountsToBlacklist   A list of accounts to migrate from the old blacklist
     * @param newSymbol             New token symbol
     * data structure to the new blacklist data structure.
     */
    function initializeV2_2(
        address[] calldata accountsToBlacklist,
        string calldata newSymbol
    ) external {
        // solhint-disable-next-line reason-string
        require(_initializedVersion == 2);
        // Update fiat token symbol
        symbol = newSymbol;
        // Add previously blacklisted accounts to the new blacklist data structure
        // and remove them from the old blacklist data structure.
        for (uint256 i = 0; i < accountsToBlacklist.length; i++) {
            require(
                _deprecatedBlacklisted[accountsToBlacklist[i]],
                "FiatTokenV2_2: Blacklisting previously unblacklisted account!"
            );
            _blacklist(accountsToBlacklist[i]);
            delete _deprecatedBlacklisted[accountsToBlacklist[i]];
        }
        _blacklist(address(this));
        delete _deprecatedBlacklisted[address(this)];
        _initializedVersion = 3;
    }
    /**
     * @dev Internal function to get the current chain id.
     * @return The current chain id.
     */
    function _chainId() internal virtual view returns (uint256) {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        return chainId;
    }
    /**
     * @inheritdoc EIP712Domain
     */
    function _domainSeparator() internal override view returns (bytes32) {
        return EIP712.makeDomainSeparator(name, "2", _chainId());
    }
    /**
     * @notice Update allowance with a signed permit
     * @dev EOA wallet signatures should be packed in the order of r, s, v.
     * @param owner       Token owner's address (Authorizer)
     * @param spender     Spender's address
     * @param value       Amount of allowance
     * @param deadline    The time at which the signature expires (unix time), or max uint256 value to signal no expiration
     * @param signature   Signature bytes signed by an EOA wallet or a contract wallet
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        bytes memory signature
    ) external whenNotPaused {
        _permit(owner, spender, value, deadline, signature);
    }
    /**
     * @notice Execute a transfer with a signed authorization
     * @dev EOA wallet signatures should be packed in the order of r, s, v.
     * @param from          Payer's address (Authorizer)
     * @param to            Payee's address
     * @param value         Amount to be transferred
     * @param validAfter    The time after which this is valid (unix time)
     * @param validBefore   The time before which this is valid (unix time)
     * @param nonce         Unique nonce
     * @param signature     Signature bytes signed by an EOA wallet or a contract wallet
     */
    function transferWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        bytes memory signature
    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {
        _transferWithAuthorization(
            from,
            to,
            value,
            validAfter,
            validBefore,
            nonce,
            signature
        );
    }
    /**
     * @notice Receive a transfer with a signed authorization from the payer
     * @dev This has an additional check to ensure that the payee's address
     * matches the caller of this function to prevent front-running attacks.
     * EOA wallet signatures should be packed in the order of r, s, v.
     * @param from          Payer's address (Authorizer)
     * @param to            Payee's address
     * @param value         Amount to be transferred
     * @param validAfter    The time after which this is valid (unix time)
     * @param validBefore   The time before which this is valid (unix time)
     * @param nonce         Unique nonce
     * @param signature     Signature bytes signed by an EOA wallet or a contract wallet
     */
    function receiveWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        bytes memory signature
    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {
        _receiveWithAuthorization(
            from,
            to,
            value,
            validAfter,
            validBefore,
            nonce,
            signature
        );
    }
    /**
     * @notice Attempt to cancel an authorization
     * @dev Works only if the authorization is not yet used.
     * EOA wallet signatures should be packed in the order of r, s, v.
     * @param authorizer    Authorizer's address
     * @param nonce         Nonce of the authorization
     * @param signature     Signature bytes signed by an EOA wallet or a contract wallet
     */
    function cancelAuthorization(
        address authorizer,
        bytes32 nonce,
        bytes memory signature
    ) external whenNotPaused {
        _cancelAuthorization(authorizer, nonce, signature);
    }
    /**
     * @dev Helper method that sets the blacklist state of an account on balanceAndBlacklistStates.
     * If _shouldBlacklist is true, we apply a (1 << 255) bitmask with an OR operation on the
     * account's balanceAndBlacklistState. This flips the high bit for the account to 1,
     * indicating that the account is blacklisted.
     *
     * If _shouldBlacklist if false, we reset the account's balanceAndBlacklistStates to their
     * balances. This clears the high bit for the account, indicating that the account is unblacklisted.
     * @param _account         The address of the account.
     * @param _shouldBlacklist True if the account should be blacklisted, false if the account should be unblacklisted.
     */
    function _setBlacklistState(address _account, bool _shouldBlacklist)
        internal
        override
    {
        balanceAndBlacklistStates[_account] = _shouldBlacklist
            ? balanceAndBlacklistStates[_account] | (1 << 255)
            : _balanceOf(_account);
    }
    /**
     * @dev Helper method that sets the balance of an account on balanceAndBlacklistStates.
     * Since balances are stored in the last 255 bits of the balanceAndBlacklistStates value,
     * we need to ensure that the updated balance does not exceed (2^255 - 1).
     * Since blacklisted accounts' balances cannot be updated, the method will also
     * revert if the account is blacklisted
     * @param _account The address of the account.
     * @param _balance The new fiat token balance of the account (max: (2^255 - 1)).
     */
    function _setBalance(address _account, uint256 _balance) internal override {
        require(
            _balance <= ((1 << 255) - 1),
            "FiatTokenV2_2: Balance exceeds (2^255 - 1)"
        );
        require(
            !_isBlacklisted(_account),
            "FiatTokenV2_2: Account is blacklisted"
        );
        balanceAndBlacklistStates[_account] = _balance;
    }
    /**
     * @inheritdoc Blacklistable
     */
    function _isBlacklisted(address _account)
        internal
        override
        view
        returns (bool)
    {
        return balanceAndBlacklistStates[_account] >> 255 == 1;
    }
    /**
     * @dev Helper method to obtain the balance of an account. Since balances
     * are stored in the last 255 bits of the balanceAndBlacklistStates value,
     * we apply a ((1 << 255) - 1) bit bitmask with an AND operation on the
     * balanceAndBlacklistState to obtain the balance.
     * @param _account  The address of the account.
     * @return          The fiat token balance of the account.
     */
    function _balanceOf(address _account)
        internal
        override
        view
        returns (uint256)
    {
        return balanceAndBlacklistStates[_account] & ((1 << 255) - 1);
    }
    /**
     * @inheritdoc FiatTokenV1
     */
    function approve(address spender, uint256 value)
        external
        override
        whenNotPaused
        returns (bool)
    {
        _approve(msg.sender, spender, value);
        return true;
    }
    /**
     * @inheritdoc FiatTokenV2
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external override whenNotPaused {
        _permit(owner, spender, value, deadline, v, r, s);
    }
    /**
     * @inheritdoc FiatTokenV2
     */
    function increaseAllowance(address spender, uint256 increment)
        external
        override
        whenNotPaused
        returns (bool)
    {
        _increaseAllowance(msg.sender, spender, increment);
        return true;
    }
    /**
     * @inheritdoc FiatTokenV2
     */
    function decreaseAllowance(address spender, uint256 decrement)
        external
        override
        whenNotPaused
        returns (bool)
    {
        _decreaseAllowance(msg.sender, spender, decrement);
        return true;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2 <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;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";
/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }
    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.
        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
 * @dev 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 >=0.6.0 <0.8.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }
    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }
    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
import { FiatTokenV2 } from "./FiatTokenV2.sol";
// solhint-disable func-name-mixedcase
/**
 * @title FiatToken V2.1
 * @notice ERC20 Token backed by fiat reserves, version 2.1
 */
contract FiatTokenV2_1 is FiatTokenV2 {
    /**
     * @notice Initialize v2.1
     * @param lostAndFound  The address to which the locked funds are sent
     */
    function initializeV2_1(address lostAndFound) external {
        // solhint-disable-next-line reason-string
        require(_initializedVersion == 1);
        uint256 lockedAmount = _balanceOf(address(this));
        if (lockedAmount > 0) {
            _transfer(address(this), lostAndFound, lockedAmount);
        }
        _blacklist(address(this));
        _initializedVersion = 2;
    }
    /**
     * @notice Version string for the EIP712 domain separator
     * @return Version string
     */
    function version() external pure returns (string memory) {
        return "2";
    }
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
import { FiatTokenV1_1 } from "../v1.1/FiatTokenV1_1.sol";
import { EIP712 } from "../util/EIP712.sol";
import { EIP3009 } from "./EIP3009.sol";
import { EIP2612 } from "./EIP2612.sol";
/**
 * @title FiatToken V2
 * @notice ERC20 Token backed by fiat reserves, version 2
 */
contract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {
    uint8 internal _initializedVersion;
    /**
     * @notice Initialize v2
     * @param newName   New token name
     */
    function initializeV2(string calldata newName) external {
        // solhint-disable-next-line reason-string
        require(initialized && _initializedVersion == 0);
        name = newName;
        _DEPRECATED_CACHED_DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(
            newName,
            "2"
        );
        _initializedVersion = 1;
    }
    /**
     * @notice Increase the allowance by a given increment
     * @param spender   Spender's address
     * @param increment Amount of increase in allowance
     * @return True if successful
     */
    function increaseAllowance(address spender, uint256 increment)
        external
        virtual
        whenNotPaused
        notBlacklisted(msg.sender)
        notBlacklisted(spender)
        returns (bool)
    {
        _increaseAllowance(msg.sender, spender, increment);
        return true;
    }
    /**
     * @notice Decrease the allowance by a given decrement
     * @param spender   Spender's address
     * @param decrement Amount of decrease in allowance
     * @return True if successful
     */
    function decreaseAllowance(address spender, uint256 decrement)
        external
        virtual
        whenNotPaused
        notBlacklisted(msg.sender)
        notBlacklisted(spender)
        returns (bool)
    {
        _decreaseAllowance(msg.sender, spender, decrement);
        return true;
    }
    /**
     * @notice Execute a transfer with a signed authorization
     * @param from          Payer's address (Authorizer)
     * @param to            Payee's address
     * @param value         Amount to be transferred
     * @param validAfter    The time after which this is valid (unix time)
     * @param validBefore   The time before which this is valid (unix time)
     * @param nonce         Unique nonce
     * @param v             v of the signature
     * @param r             r of the signature
     * @param s             s of the signature
     */
    function transferWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {
        _transferWithAuthorization(
            from,
            to,
            value,
            validAfter,
            validBefore,
            nonce,
            v,
            r,
            s
        );
    }
    /**
     * @notice Receive a transfer with a signed authorization from the payer
     * @dev This has an additional check to ensure that the payee's address
     * matches the caller of this function to prevent front-running attacks.
     * @param from          Payer's address (Authorizer)
     * @param to            Payee's address
     * @param value         Amount to be transferred
     * @param validAfter    The time after which this is valid (unix time)
     * @param validBefore   The time before which this is valid (unix time)
     * @param nonce         Unique nonce
     * @param v             v of the signature
     * @param r             r of the signature
     * @param s             s of the signature
     */
    function receiveWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {
        _receiveWithAuthorization(
            from,
            to,
            value,
            validAfter,
            validBefore,
            nonce,
            v,
            r,
            s
        );
    }
    /**
     * @notice Attempt to cancel an authorization
     * @dev Works only if the authorization is not yet used.
     * @param authorizer    Authorizer's address
     * @param nonce         Nonce of the authorization
     * @param v             v of the signature
     * @param r             r of the signature
     * @param s             s of the signature
     */
    function cancelAuthorization(
        address authorizer,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external whenNotPaused {
        _cancelAuthorization(authorizer, nonce, v, r, s);
    }
    /**
     * @notice Update allowance with a signed permit
     * @param owner       Token owner's address (Authorizer)
     * @param spender     Spender's address
     * @param value       Amount of allowance
     * @param deadline    The time at which the signature expires (unix time), or max uint256 value to signal no expiration
     * @param v           v of the signature
     * @param r           r of the signature
     * @param s           s of the signature
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    )
        external
        virtual
        whenNotPaused
        notBlacklisted(owner)
        notBlacklisted(spender)
    {
        _permit(owner, spender, value, deadline, v, r, s);
    }
    /**
     * @dev Internal function to increase the allowance by a given increment
     * @param owner     Token owner's address
     * @param spender   Spender's address
     * @param increment Amount of increase
     */
    function _increaseAllowance(
        address owner,
        address spender,
        uint256 increment
    ) internal override {
        _approve(owner, spender, allowed[owner][spender].add(increment));
    }
    /**
     * @dev Internal function to decrease the allowance by a given decrement
     * @param owner     Token owner's address
     * @param spender   Spender's address
     * @param decrement Amount of decrease
     */
    function _decreaseAllowance(
        address owner,
        address spender,
        uint256 decrement
    ) internal override {
        _approve(
            owner,
            spender,
            allowed[owner][spender].sub(
                decrement,
                "ERC20: decreased allowance below zero"
            )
        );
    }
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
// solhint-disable func-name-mixedcase
/**
 * @title EIP712 Domain
 */
contract EIP712Domain {
    // was originally DOMAIN_SEPARATOR
    // but that has been moved to a method so we can override it in V2_2+
    bytes32 internal _DEPRECATED_CACHED_DOMAIN_SEPARATOR;
    /**
     * @notice Get the EIP712 Domain Separator.
     * @return The bytes32 EIP712 domain separator.
     */
    function DOMAIN_SEPARATOR() external view returns (bytes32) {
        return _domainSeparator();
    }
    /**
     * @dev Internal method to get the EIP712 Domain Separator.
     * @return The bytes32 EIP712 domain separator.
     */
    function _domainSeparator() internal virtual view returns (bytes32) {
        return _DEPRECATED_CACHED_DOMAIN_SEPARATOR;
    }
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
import { AbstractFiatTokenV2 } from "./AbstractFiatTokenV2.sol";
import { EIP712Domain } from "./EIP712Domain.sol";
import { SignatureChecker } from "../util/SignatureChecker.sol";
import { MessageHashUtils } from "../util/MessageHashUtils.sol";
/**
 * @title EIP-3009
 * @notice Provide internal implementation for gas-abstracted transfers
 * @dev Contracts that inherit from this must wrap these with publicly
 * accessible functions, optionally adding modifiers where necessary
 */
abstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {
    // keccak256("TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)")
    bytes32
        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;
    // keccak256("ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)")
    bytes32
        public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;
    // keccak256("CancelAuthorization(address authorizer,bytes32 nonce)")
    bytes32
        public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;
    /**
     * @dev authorizer address => nonce => bool (true if nonce is used)
     */
    mapping(address => mapping(bytes32 => bool)) private _authorizationStates;
    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);
    event AuthorizationCanceled(
        address indexed authorizer,
        bytes32 indexed nonce
    );
    /**
     * @notice Returns the state of an authorization
     * @dev Nonces are randomly generated 32-byte data unique to the
     * authorizer's address
     * @param authorizer    Authorizer's address
     * @param nonce         Nonce of the authorization
     * @return True if the nonce is used
     */
    function authorizationState(address authorizer, bytes32 nonce)
        external
        view
        returns (bool)
    {
        return _authorizationStates[authorizer][nonce];
    }
    /**
     * @notice Execute a transfer with a signed authorization
     * @param from          Payer's address (Authorizer)
     * @param to            Payee's address
     * @param value         Amount to be transferred
     * @param validAfter    The time after which this is valid (unix time)
     * @param validBefore   The time before which this is valid (unix time)
     * @param nonce         Unique nonce
     * @param v             v of the signature
     * @param r             r of the signature
     * @param s             s of the signature
     */
    function _transferWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        _transferWithAuthorization(
            from,
            to,
            value,
            validAfter,
            validBefore,
            nonce,
            abi.encodePacked(r, s, v)
        );
    }
    /**
     * @notice Execute a transfer with a signed authorization
     * @dev EOA wallet signatures should be packed in the order of r, s, v.
     * @param from          Payer's address (Authorizer)
     * @param to            Payee's address
     * @param value         Amount to be transferred
     * @param validAfter    The time after which this is valid (unix time)
     * @param validBefore   The time before which this is valid (unix time)
     * @param nonce         Unique nonce
     * @param signature     Signature byte array produced by an EOA wallet or a contract wallet
     */
    function _transferWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        bytes memory signature
    ) internal {
        _requireValidAuthorization(from, nonce, validAfter, validBefore);
        _requireValidSignature(
            from,
            keccak256(
                abi.encode(
                    TRANSFER_WITH_AUTHORIZATION_TYPEHASH,
                    from,
                    to,
                    value,
                    validAfter,
                    validBefore,
                    nonce
                )
            ),
            signature
        );
        _markAuthorizationAsUsed(from, nonce);
        _transfer(from, to, value);
    }
    /**
     * @notice Receive a transfer with a signed authorization from the payer
     * @dev This has an additional check to ensure that the payee's address
     * matches the caller of this function to prevent front-running attacks.
     * @param from          Payer's address (Authorizer)
     * @param to            Payee's address
     * @param value         Amount to be transferred
     * @param validAfter    The time after which this is valid (unix time)
     * @param validBefore   The time before which this is valid (unix time)
     * @param nonce         Unique nonce
     * @param v             v of the signature
     * @param r             r of the signature
     * @param s             s of the signature
     */
    function _receiveWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        _receiveWithAuthorization(
            from,
            to,
            value,
            validAfter,
            validBefore,
            nonce,
            abi.encodePacked(r, s, v)
        );
    }
    /**
     * @notice Receive a transfer with a signed authorization from the payer
     * @dev This has an additional check to ensure that the payee's address
     * matches the caller of this function to prevent front-running attacks.
     * EOA wallet signatures should be packed in the order of r, s, v.
     * @param from          Payer's address (Authorizer)
     * @param to            Payee's address
     * @param value         Amount to be transferred
     * @param validAfter    The time after which this is valid (unix time)
     * @param validBefore   The time before which this is valid (unix time)
     * @param nonce         Unique nonce
     * @param signature     Signature byte array produced by an EOA wallet or a contract wallet
     */
    function _receiveWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        bytes memory signature
    ) internal {
        require(to == msg.sender, "FiatTokenV2: caller must be the payee");
        _requireValidAuthorization(from, nonce, validAfter, validBefore);
        _requireValidSignature(
            from,
            keccak256(
                abi.encode(
                    RECEIVE_WITH_AUTHORIZATION_TYPEHASH,
                    from,
                    to,
                    value,
                    validAfter,
                    validBefore,
                    nonce
                )
            ),
            signature
        );
        _markAuthorizationAsUsed(from, nonce);
        _transfer(from, to, value);
    }
    /**
     * @notice Attempt to cancel an authorization
     * @param authorizer    Authorizer's address
     * @param nonce         Nonce of the authorization
     * @param v             v of the signature
     * @param r             r of the signature
     * @param s             s of the signature
     */
    function _cancelAuthorization(
        address authorizer,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        _cancelAuthorization(authorizer, nonce, abi.encodePacked(r, s, v));
    }
    /**
     * @notice Attempt to cancel an authorization
     * @dev EOA wallet signatures should be packed in the order of r, s, v.
     * @param authorizer    Authorizer's address
     * @param nonce         Nonce of the authorization
     * @param signature     Signature byte array produced by an EOA wallet or a contract wallet
     */
    function _cancelAuthorization(
        address authorizer,
        bytes32 nonce,
        bytes memory signature
    ) internal {
        _requireUnusedAuthorization(authorizer, nonce);
        _requireValidSignature(
            authorizer,
            keccak256(
                abi.encode(CANCEL_AUTHORIZATION_TYPEHASH, authorizer, nonce)
            ),
            signature
        );
        _authorizationStates[authorizer][nonce] = true;
        emit AuthorizationCanceled(authorizer, nonce);
    }
    /**
     * @notice Validates that signature against input data struct
     * @param signer        Signer's address
     * @param dataHash      Hash of encoded data struct
     * @param signature     Signature byte array produced by an EOA wallet or a contract wallet
     */
    function _requireValidSignature(
        address signer,
        bytes32 dataHash,
        bytes memory signature
    ) private view {
        require(
            SignatureChecker.isValidSignatureNow(
                signer,
                MessageHashUtils.toTypedDataHash(_domainSeparator(), dataHash),
                signature
            ),
            "FiatTokenV2: invalid signature"
        );
    }
    /**
     * @notice Check that an authorization is unused
     * @param authorizer    Authorizer's address
     * @param nonce         Nonce of the authorization
     */
    function _requireUnusedAuthorization(address authorizer, bytes32 nonce)
        private
        view
    {
        require(
            !_authorizationStates[authorizer][nonce],
            "FiatTokenV2: authorization is used or canceled"
        );
    }
    /**
     * @notice Check that authorization is valid
     * @param authorizer    Authorizer's address
     * @param nonce         Nonce of the authorization
     * @param validAfter    The time after which this is valid (unix time)
     * @param validBefore   The time before which this is valid (unix time)
     */
    function _requireValidAuthorization(
        address authorizer,
        bytes32 nonce,
        uint256 validAfter,
        uint256 validBefore
    ) private view {
        require(
            now > validAfter,
            "FiatTokenV2: authorization is not yet valid"
        );
        require(now < validBefore, "FiatTokenV2: authorization is expired");
        _requireUnusedAuthorization(authorizer, nonce);
    }
    /**
     * @notice Mark an authorization as used
     * @param authorizer    Authorizer's address
     * @param nonce         Nonce of the authorization
     */
    function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)
        private
    {
        _authorizationStates[authorizer][nonce] = true;
        emit AuthorizationUsed(authorizer, nonce);
    }
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
import { AbstractFiatTokenV2 } from "./AbstractFiatTokenV2.sol";
import { EIP712Domain } from "./EIP712Domain.sol";
import { MessageHashUtils } from "../util/MessageHashUtils.sol";
import { SignatureChecker } from "../util/SignatureChecker.sol";
/**
 * @title EIP-2612
 * @notice Provide internal implementation for gas-abstracted approvals
 */
abstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)")
    bytes32
        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    mapping(address => uint256) private _permitNonces;
    /**
     * @notice Nonces for permit
     * @param owner Token owner's address (Authorizer)
     * @return Next nonce
     */
    function nonces(address owner) external view returns (uint256) {
        return _permitNonces[owner];
    }
    /**
     * @notice Verify a signed approval permit and execute if valid
     * @param owner     Token owner's address (Authorizer)
     * @param spender   Spender's address
     * @param value     Amount of allowance
     * @param deadline  The time at which the signature expires (unix time), or max uint256 value to signal no expiration
     * @param v         v of the signature
     * @param r         r of the signature
     * @param s         s of the signature
     */
    function _permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        _permit(owner, spender, value, deadline, abi.encodePacked(r, s, v));
    }
    /**
     * @notice Verify a signed approval permit and execute if valid
     * @dev EOA wallet signatures should be packed in the order of r, s, v.
     * @param owner      Token owner's address (Authorizer)
     * @param spender    Spender's address
     * @param value      Amount of allowance
     * @param deadline   The time at which the signature expires (unix time), or max uint256 value to signal no expiration
     * @param signature  Signature byte array signed by an EOA wallet or a contract wallet
     */
    function _permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        bytes memory signature
    ) internal {
        require(
            deadline == type(uint256).max || deadline >= now,
            "FiatTokenV2: permit is expired"
        );
        bytes32 typedDataHash = MessageHashUtils.toTypedDataHash(
            _domainSeparator(),
            keccak256(
                abi.encode(
                    PERMIT_TYPEHASH,
                    owner,
                    spender,
                    value,
                    _permitNonces[owner]++,
                    deadline
                )
            )
        );
        require(
            SignatureChecker.isValidSignatureNow(
                owner,
                typedDataHash,
                signature
            ),
            "EIP2612: invalid signature"
        );
        _approve(owner, spender, value);
    }
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
import { AbstractFiatTokenV1 } from "../v1/AbstractFiatTokenV1.sol";
abstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {
    function _increaseAllowance(
        address owner,
        address spender,
        uint256 increment
    ) internal virtual;
    function _decreaseAllowance(
        address owner,
        address spender,
        uint256 decrement
    ) internal virtual;
}
/**
 * SPDX-License-Identifier: MIT
 *
 * Copyright (c) 2016 Smart Contract Solutions, Inc.
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
pragma solidity 0.6.12;
import { Ownable } from "./Ownable.sol";
/**
 * @notice Base contract which allows children to implement an emergency stop
 * mechanism
 * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol
 * Modifications:
 * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)
 * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)
 * 3. Removed whenPaused (6/14/2018)
 * 4. Switches ownable library to use ZeppelinOS (7/12/18)
 * 5. Remove constructor (7/13/18)
 * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)
 * 7. Make public functions external (5/27/20)
 */
contract Pausable is Ownable {
    event Pause();
    event Unpause();
    event PauserChanged(address indexed newAddress);
    address public pauser;
    bool public paused = false;
    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     */
    modifier whenNotPaused() {
        require(!paused, "Pausable: paused");
        _;
    }
    /**
     * @dev throws if called by any account other than the pauser
     */
    modifier onlyPauser() {
        require(msg.sender == pauser, "Pausable: caller is not the pauser");
        _;
    }
    /**
     * @dev called by the owner to pause, triggers stopped state
     */
    function pause() external onlyPauser {
        paused = true;
        emit Pause();
    }
    /**
     * @dev called by the owner to unpause, returns to normal state
     */
    function unpause() external onlyPauser {
        paused = false;
        emit Unpause();
    }
    /**
     * @notice Updates the pauser address.
     * @param _newPauser The address of the new pauser.
     */
    function updatePauser(address _newPauser) external onlyOwner {
        require(
            _newPauser != address(0),
            "Pausable: new pauser is the zero address"
        );
        pauser = _newPauser;
        emit PauserChanged(pauser);
    }
}
/**
 * SPDX-License-Identifier: MIT
 *
 * Copyright (c) 2018 zOS Global Limited.
 * Copyright (c) 2018-2020 CENTRE SECZ
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
pragma solidity 0.6.12;
/**
 * @notice The Ownable contract has an owner address, and provides basic
 * authorization control functions
 * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol
 * Modifications:
 * 1. Consolidate OwnableStorage into this contract (7/13/18)
 * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)
 * 3. Make public functions external (5/27/20)
 */
contract Ownable {
    // Owner of the contract
    address private _owner;
    /**
     * @dev Event to show ownership has been transferred
     * @param previousOwner representing the address of the previous owner
     * @param newOwner representing the address of the new owner
     */
    event OwnershipTransferred(address previousOwner, address newOwner);
    /**
     * @dev The constructor sets the original owner of the contract to the sender account.
     */
    constructor() public {
        setOwner(msg.sender);
    }
    /**
     * @dev Tells the address of the owner
     * @return the address of the owner
     */
    function owner() external view returns (address) {
        return _owner;
    }
    /**
     * @dev Sets a new owner address
     */
    function setOwner(address newOwner) internal {
        _owner = newOwner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(msg.sender == _owner, "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) external onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        setOwner(newOwner);
    }
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
import { SafeMath } from "@openzeppelin/contracts/math/SafeMath.sol";
import { AbstractFiatTokenV1 } from "./AbstractFiatTokenV1.sol";
import { Ownable } from "./Ownable.sol";
import { Pausable } from "./Pausable.sol";
import { Blacklistable } from "./Blacklistable.sol";
/**
 * @title FiatToken
 * @dev ERC20 Token backed by fiat reserves
 */
contract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {
    using SafeMath for uint256;
    string public name;
    string public symbol;
    uint8 public decimals;
    string public currency;
    address public masterMinter;
    bool internal initialized;
    /// @dev A mapping that stores the balance and blacklist states for a given address.
    /// The first bit defines whether the address is blacklisted (1 if blacklisted, 0 otherwise).
    /// The last 255 bits define the balance for the address.
    mapping(address => uint256) internal balanceAndBlacklistStates;
    mapping(address => mapping(address => uint256)) internal allowed;
    uint256 internal totalSupply_ = 0;
    mapping(address => bool) internal minters;
    mapping(address => uint256) internal minterAllowed;
    event Mint(address indexed minter, address indexed to, uint256 amount);
    event Burn(address indexed burner, uint256 amount);
    event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);
    event MinterRemoved(address indexed oldMinter);
    event MasterMinterChanged(address indexed newMasterMinter);
    /**
     * @notice Initializes the fiat token contract.
     * @param tokenName       The name of the fiat token.
     * @param tokenSymbol     The symbol of the fiat token.
     * @param tokenCurrency   The fiat currency that the token represents.
     * @param tokenDecimals   The number of decimals that the token uses.
     * @param newMasterMinter The masterMinter address for the fiat token.
     * @param newPauser       The pauser address for the fiat token.
     * @param newBlacklister  The blacklister address for the fiat token.
     * @param newOwner        The owner of the fiat token.
     */
    function initialize(
        string memory tokenName,
        string memory tokenSymbol,
        string memory tokenCurrency,
        uint8 tokenDecimals,
        address newMasterMinter,
        address newPauser,
        address newBlacklister,
        address newOwner
    ) public {
        require(!initialized, "FiatToken: contract is already initialized");
        require(
            newMasterMinter != address(0),
            "FiatToken: new masterMinter is the zero address"
        );
        require(
            newPauser != address(0),
            "FiatToken: new pauser is the zero address"
        );
        require(
            newBlacklister != address(0),
            "FiatToken: new blacklister is the zero address"
        );
        require(
            newOwner != address(0),
            "FiatToken: new owner is the zero address"
        );
        name = tokenName;
        symbol = tokenSymbol;
        currency = tokenCurrency;
        decimals = tokenDecimals;
        masterMinter = newMasterMinter;
        pauser = newPauser;
        blacklister = newBlacklister;
        setOwner(newOwner);
        initialized = true;
    }
    /**
     * @dev Throws if called by any account other than a minter.
     */
    modifier onlyMinters() {
        require(minters[msg.sender], "FiatToken: caller is not a minter");
        _;
    }
    /**
     * @notice Mints fiat tokens to an address.
     * @param _to The address that will receive the minted tokens.
     * @param _amount The amount of tokens to mint. Must be less than or equal
     * to the minterAllowance of the caller.
     * @return True if the operation was successful.
     */
    function mint(address _to, uint256 _amount)
        external
        whenNotPaused
        onlyMinters
        notBlacklisted(msg.sender)
        notBlacklisted(_to)
        returns (bool)
    {
        require(_to != address(0), "FiatToken: mint to the zero address");
        require(_amount > 0, "FiatToken: mint amount not greater than 0");
        uint256 mintingAllowedAmount = minterAllowed[msg.sender];
        require(
            _amount <= mintingAllowedAmount,
            "FiatToken: mint amount exceeds minterAllowance"
        );
        totalSupply_ = totalSupply_.add(_amount);
        _setBalance(_to, _balanceOf(_to).add(_amount));
        minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);
        emit Mint(msg.sender, _to, _amount);
        emit Transfer(address(0), _to, _amount);
        return true;
    }
    /**
     * @dev Throws if called by any account other than the masterMinter
     */
    modifier onlyMasterMinter() {
        require(
            msg.sender == masterMinter,
            "FiatToken: caller is not the masterMinter"
        );
        _;
    }
    /**
     * @notice Gets the minter allowance for an account.
     * @param minter The address to check.
     * @return The remaining minter allowance for the account.
     */
    function minterAllowance(address minter) external view returns (uint256) {
        return minterAllowed[minter];
    }
    /**
     * @notice Checks if an account is a minter.
     * @param account The address to check.
     * @return True if the account is a minter, false if the account is not a minter.
     */
    function isMinter(address account) external view returns (bool) {
        return minters[account];
    }
    /**
     * @notice Gets the remaining amount of fiat tokens a spender is allowed to transfer on
     * behalf of the token owner.
     * @param owner   The token owner's address.
     * @param spender The spender's address.
     * @return The remaining allowance.
     */
    function allowance(address owner, address spender)
        external
        override
        view
        returns (uint256)
    {
        return allowed[owner][spender];
    }
    /**
     * @notice Gets the totalSupply of the fiat token.
     * @return The totalSupply of the fiat token.
     */
    function totalSupply() external override view returns (uint256) {
        return totalSupply_;
    }
    /**
     * @notice Gets the fiat token balance of an account.
     * @param account  The address to check.
     * @return balance The fiat token balance of the account.
     */
    function balanceOf(address account)
        external
        override
        view
        returns (uint256)
    {
        return _balanceOf(account);
    }
    /**
     * @notice Sets a fiat token allowance for a spender to spend on behalf of the caller.
     * @param spender The spender's address.
     * @param value   The allowance amount.
     * @return True if the operation was successful.
     */
    function approve(address spender, uint256 value)
        external
        virtual
        override
        whenNotPaused
        notBlacklisted(msg.sender)
        notBlacklisted(spender)
        returns (bool)
    {
        _approve(msg.sender, spender, value);
        return true;
    }
    /**
     * @dev Internal function to set allowance.
     * @param owner     Token owner's address.
     * @param spender   Spender's address.
     * @param value     Allowance amount.
     */
    function _approve(
        address owner,
        address spender,
        uint256 value
    ) internal override {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        allowed[owner][spender] = value;
        emit Approval(owner, spender, value);
    }
    /**
     * @notice Transfers tokens from an address to another by spending the caller's allowance.
     * @dev The caller must have some fiat token allowance on the payer's tokens.
     * @param from  Payer's address.
     * @param to    Payee's address.
     * @param value Transfer amount.
     * @return True if the operation was successful.
     */
    function transferFrom(
        address from,
        address to,
        uint256 value
    )
        external
        override
        whenNotPaused
        notBlacklisted(msg.sender)
        notBlacklisted(from)
        notBlacklisted(to)
        returns (bool)
    {
        require(
            value <= allowed[from][msg.sender],
            "ERC20: transfer amount exceeds allowance"
        );
        _transfer(from, to, value);
        allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);
        return true;
    }
    /**
     * @notice Transfers tokens from the caller.
     * @param to    Payee's address.
     * @param value Transfer amount.
     * @return True if the operation was successful.
     */
    function transfer(address to, uint256 value)
        external
        override
        whenNotPaused
        notBlacklisted(msg.sender)
        notBlacklisted(to)
        returns (bool)
    {
        _transfer(msg.sender, to, value);
        return true;
    }
    /**
     * @dev Internal function to process transfers.
     * @param from  Payer's address.
     * @param to    Payee's address.
     * @param value Transfer amount.
     */
    function _transfer(
        address from,
        address to,
        uint256 value
    ) internal override {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(
            value <= _balanceOf(from),
            "ERC20: transfer amount exceeds balance"
        );
        _setBalance(from, _balanceOf(from).sub(value));
        _setBalance(to, _balanceOf(to).add(value));
        emit Transfer(from, to, value);
    }
    /**
     * @notice Adds or updates a new minter with a mint allowance.
     * @param minter The address of the minter.
     * @param minterAllowedAmount The minting amount allowed for the minter.
     * @return True if the operation was successful.
     */
    function configureMinter(address minter, uint256 minterAllowedAmount)
        external
        whenNotPaused
        onlyMasterMinter
        returns (bool)
    {
        minters[minter] = true;
        minterAllowed[minter] = minterAllowedAmount;
        emit MinterConfigured(minter, minterAllowedAmount);
        return true;
    }
    /**
     * @notice Removes a minter.
     * @param minter The address of the minter to remove.
     * @return True if the operation was successful.
     */
    function removeMinter(address minter)
        external
        onlyMasterMinter
        returns (bool)
    {
        minters[minter] = false;
        minterAllowed[minter] = 0;
        emit MinterRemoved(minter);
        return true;
    }
    /**
     * @notice Allows a minter to burn some of its own tokens.
     * @dev The caller must be a minter, must not be blacklisted, and the amount to burn
     * should be less than or equal to the account's balance.
     * @param _amount the amount of tokens to be burned.
     */
    function burn(uint256 _amount)
        external
        whenNotPaused
        onlyMinters
        notBlacklisted(msg.sender)
    {
        uint256 balance = _balanceOf(msg.sender);
        require(_amount > 0, "FiatToken: burn amount not greater than 0");
        require(balance >= _amount, "FiatToken: burn amount exceeds balance");
        totalSupply_ = totalSupply_.sub(_amount);
        _setBalance(msg.sender, balance.sub(_amount));
        emit Burn(msg.sender, _amount);
        emit Transfer(msg.sender, address(0), _amount);
    }
    /**
     * @notice Updates the master minter address.
     * @param _newMasterMinter The address of the new master minter.
     */
    function updateMasterMinter(address _newMasterMinter) external onlyOwner {
        require(
            _newMasterMinter != address(0),
            "FiatToken: new masterMinter is the zero address"
        );
        masterMinter = _newMasterMinter;
        emit MasterMinterChanged(masterMinter);
    }
    /**
     * @inheritdoc Blacklistable
     */
    function _blacklist(address _account) internal override {
        _setBlacklistState(_account, true);
    }
    /**
     * @inheritdoc Blacklistable
     */
    function _unBlacklist(address _account) internal override {
        _setBlacklistState(_account, false);
    }
    /**
     * @dev Helper method that sets the blacklist state of an account.
     * @param _account         The address of the account.
     * @param _shouldBlacklist True if the account should be blacklisted, false if the account should be unblacklisted.
     */
    function _setBlacklistState(address _account, bool _shouldBlacklist)
        internal
        virtual
    {
        _deprecatedBlacklisted[_account] = _shouldBlacklist;
    }
    /**
     * @dev Helper method that sets the balance of an account.
     * @param _account The address of the account.
     * @param _balance The new fiat token balance of the account.
     */
    function _setBalance(address _account, uint256 _balance) internal virtual {
        balanceAndBlacklistStates[_account] = _balance;
    }
    /**
     * @inheritdoc Blacklistable
     */
    function _isBlacklisted(address _account)
        internal
        virtual
        override
        view
        returns (bool)
    {
        return _deprecatedBlacklisted[_account];
    }
    /**
     * @dev Helper method to obtain the balance of an account.
     * @param _account  The address of the account.
     * @return          The fiat token balance of the account.
     */
    function _balanceOf(address _account)
        internal
        virtual
        view
        returns (uint256)
    {
        return balanceAndBlacklistStates[_account];
    }
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
import { Ownable } from "./Ownable.sol";
/**
 * @title Blacklistable Token
 * @dev Allows accounts to be blacklisted by a "blacklister" role
 */
abstract contract Blacklistable is Ownable {
    address public blacklister;
    mapping(address => bool) internal _deprecatedBlacklisted;
    event Blacklisted(address indexed _account);
    event UnBlacklisted(address indexed _account);
    event BlacklisterChanged(address indexed newBlacklister);
    /**
     * @dev Throws if called by any account other than the blacklister.
     */
    modifier onlyBlacklister() {
        require(
            msg.sender == blacklister,
            "Blacklistable: caller is not the blacklister"
        );
        _;
    }
    /**
     * @dev Throws if argument account is blacklisted.
     * @param _account The address to check.
     */
    modifier notBlacklisted(address _account) {
        require(
            !_isBlacklisted(_account),
            "Blacklistable: account is blacklisted"
        );
        _;
    }
    /**
     * @notice Checks if account is blacklisted.
     * @param _account The address to check.
     * @return True if the account is blacklisted, false if the account is not blacklisted.
     */
    function isBlacklisted(address _account) external view returns (bool) {
        return _isBlacklisted(_account);
    }
    /**
     * @notice Adds account to blacklist.
     * @param _account The address to blacklist.
     */
    function blacklist(address _account) external onlyBlacklister {
        _blacklist(_account);
        emit Blacklisted(_account);
    }
    /**
     * @notice Removes account from blacklist.
     * @param _account The address to remove from the blacklist.
     */
    function unBlacklist(address _account) external onlyBlacklister {
        _unBlacklist(_account);
        emit UnBlacklisted(_account);
    }
    /**
     * @notice Updates the blacklister address.
     * @param _newBlacklister The address of the new blacklister.
     */
    function updateBlacklister(address _newBlacklister) external onlyOwner {
        require(
            _newBlacklister != address(0),
            "Blacklistable: new blacklister is the zero address"
        );
        blacklister = _newBlacklister;
        emit BlacklisterChanged(blacklister);
    }
    /**
     * @dev Checks if account is blacklisted.
     * @param _account The address to check.
     * @return true if the account is blacklisted, false otherwise.
     */
    function _isBlacklisted(address _account)
        internal
        virtual
        view
        returns (bool);
    /**
     * @dev Helper method that blacklists an account.
     * @param _account The address to blacklist.
     */
    function _blacklist(address _account) internal virtual;
    /**
     * @dev Helper method that unblacklists an account.
     * @param _account The address to unblacklist.
     */
    function _unBlacklist(address _account) internal virtual;
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
abstract contract AbstractFiatTokenV1 is IERC20 {
    function _approve(
        address owner,
        address spender,
        uint256 value
    ) internal virtual;
    function _transfer(
        address from,
        address to,
        uint256 value
    ) internal virtual;
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
import { Ownable } from "../v1/Ownable.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
contract Rescuable is Ownable {
    using SafeERC20 for IERC20;
    address private _rescuer;
    event RescuerChanged(address indexed newRescuer);
    /**
     * @notice Returns current rescuer
     * @return Rescuer's address
     */
    function rescuer() external view returns (address) {
        return _rescuer;
    }
    /**
     * @notice Revert if called by any account other than the rescuer.
     */
    modifier onlyRescuer() {
        require(msg.sender == _rescuer, "Rescuable: caller is not the rescuer");
        _;
    }
    /**
     * @notice Rescue ERC20 tokens locked up in this contract.
     * @param tokenContract ERC20 token contract address
     * @param to        Recipient address
     * @param amount    Amount to withdraw
     */
    function rescueERC20(
        IERC20 tokenContract,
        address to,
        uint256 amount
    ) external onlyRescuer {
        tokenContract.safeTransfer(to, amount);
    }
    /**
     * @notice Updates the rescuer address.
     * @param newRescuer The address of the new rescuer.
     */
    function updateRescuer(address newRescuer) external onlyOwner {
        require(
            newRescuer != address(0),
            "Rescuable: new rescuer is the zero address"
        );
        _rescuer = newRescuer;
        emit RescuerChanged(newRescuer);
    }
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
import { FiatTokenV1 } from "../v1/FiatTokenV1.sol";
import { Rescuable } from "./Rescuable.sol";
/**
 * @title FiatTokenV1_1
 * @dev ERC20 Token backed by fiat reserves
 */
contract FiatTokenV1_1 is FiatTokenV1, Rescuable {
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
import { ECRecover } from "./ECRecover.sol";
import { IERC1271 } from "../interface/IERC1271.sol";
/**
 * @dev Signature verification helper that can be used instead of `ECRecover.recover` to seamlessly support both ECDSA
 * signatures from externally owned accounts (EOAs) as well as ERC1271 signatures from smart contract wallets.
 *
 * Adapted from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/21bb89ef5bfc789b9333eb05e3ba2b7b284ac77c/contracts/utils/cryptography/SignatureChecker.sol
 */
library SignatureChecker {
    /**
     * @dev Checks if a signature is valid for a given signer and data hash. If the signer is a smart contract, the
     * signature is validated against that smart contract using ERC1271, otherwise it's validated using `ECRecover.recover`.
     * @param signer        Address of the claimed signer
     * @param digest        Keccak-256 hash digest of the signed message
     * @param signature     Signature byte array associated with hash
     */
    function isValidSignatureNow(
        address signer,
        bytes32 digest,
        bytes memory signature
    ) external view returns (bool) {
        if (!isContract(signer)) {
            return ECRecover.recover(digest, signature) == signer;
        }
        return isValidERC1271SignatureNow(signer, digest, signature);
    }
    /**
     * @dev Checks if a signature is valid for a given signer and data hash. The signature is validated
     * against the signer smart contract using ERC1271.
     * @param signer        Address of the claimed signer
     * @param digest        Keccak-256 hash digest of the signed message
     * @param signature     Signature byte array associated with hash
     *
     * NOTE: Unlike ECDSA signatures, contract signatures are revocable, and the outcome of this function can thus
     * change through time. It could return true at block N and false at block N+1 (or the opposite).
     */
    function isValidERC1271SignatureNow(
        address signer,
        bytes32 digest,
        bytes memory signature
    ) internal view returns (bool) {
        (bool success, bytes memory result) = signer.staticcall(
            abi.encodeWithSelector(
                IERC1271.isValidSignature.selector,
                digest,
                signature
            )
        );
        return (success &&
            result.length >= 32 &&
            abi.decode(result, (bytes32)) ==
            bytes32(IERC1271.isValidSignature.selector));
    }
    /**
     * @dev Checks if the input address is a smart contract.
     */
    function isContract(address addr) internal view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(addr)
        }
        return size > 0;
    }
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
/**
 * @dev Signature message hash utilities for producing digests to be consumed by {ECDSA} recovery or signing.
 *
 * The library provides methods for generating a hash of a message that conforms to the
 * https://eips.ethereum.org/EIPS/eip-191[EIP 191] and https://eips.ethereum.org/EIPS/eip-712[EIP 712]
 * specifications.
 */
library MessageHashUtils {
    /**
     * @dev Returns the keccak256 digest of an EIP-712 typed data (EIP-191 version `0x01`).
     * Adapted from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/21bb89ef5bfc789b9333eb05e3ba2b7b284ac77c/contracts/utils/cryptography/MessageHashUtils.sol
     *
     * The digest is calculated from a `domainSeparator` and a `structHash`, by prefixing them with
     * `\\x19\\x01` and hashing the result. It corresponds to the hash signed by the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] JSON-RPC method as part of EIP-712.
     *
     * @param domainSeparator    Domain separator
     * @param structHash         Hashed EIP-712 data struct
     * @return digest            The keccak256 digest of an EIP-712 typed data
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash)
        internal
        pure
        returns (bytes32 digest)
    {
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, "\\x19\\x01")
            mstore(add(ptr, 0x02), domainSeparator)
            mstore(add(ptr, 0x22), structHash)
            digest := keccak256(ptr, 0x42)
        }
    }
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
/**
 * @title EIP712
 * @notice A library that provides EIP712 helper functions
 */
library EIP712 {
    /**
     * @notice Make EIP712 domain separator
     * @param name      Contract name
     * @param version   Contract version
     * @param chainId   Blockchain ID
     * @return Domain separator
     */
    function makeDomainSeparator(
        string memory name,
        string memory version,
        uint256 chainId
    ) internal view returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    // keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")
                    0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,
                    keccak256(bytes(name)),
                    keccak256(bytes(version)),
                    chainId,
                    address(this)
                )
            );
    }
    /**
     * @notice Make EIP712 domain separator
     * @param name      Contract name
     * @param version   Contract version
     * @return Domain separator
     */
    function makeDomainSeparator(string memory name, string memory version)
        internal
        view
        returns (bytes32)
    {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        return makeDomainSeparator(name, version, chainId);
    }
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
/**
 * @title ECRecover
 * @notice A library that provides a safe ECDSA recovery function
 */
library ECRecover {
    /**
     * @notice Recover signer's address from a signed message
     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol
     * Modifications: Accept v, r, and s as separate arguments
     * @param digest    Keccak-256 hash digest of the signed message
     * @param v         v of the signature
     * @param r         r of the signature
     * @param s         s of the signature
     * @return Signer address
     */
    function recover(
        bytes32 digest,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (
            uint256(s) >
            0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0
        ) {
            revert("ECRecover: invalid signature 's' value");
        }
        if (v != 27 && v != 28) {
            revert("ECRecover: invalid signature 'v' value");
        }
        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(digest, v, r, s);
        require(signer != address(0), "ECRecover: invalid signature");
        return signer;
    }
    /**
     * @notice Recover signer's address from a signed message
     * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/0053ee040a7ff1dbc39691c9e67a69f564930a88/contracts/utils/cryptography/ECDSA.sol
     * @param digest    Keccak-256 hash digest of the signed message
     * @param signature Signature byte array associated with hash
     * @return Signer address
     */
    function recover(bytes32 digest, bytes memory signature)
        internal
        pure
        returns (address)
    {
        require(signature.length == 65, "ECRecover: invalid signature length");
        bytes32 r;
        bytes32 s;
        uint8 v;
        // ecrecover takes the signature parameters, and the only way to get them
        // currently is to use assembly.
        /// @solidity memory-safe-assembly
        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := byte(0, mload(add(signature, 0x60)))
        }
        return recover(digest, v, r, s);
    }
}
/**
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2023, Circle Internet Financial, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
pragma solidity 0.6.12;
/**
 * @dev Interface of the ERC1271 standard signature validation method for
 * contracts as defined in https://eips.ethereum.org/EIPS/eip-1271[ERC-1271].
 */
interface IERC1271 {
    /**
     * @dev Should return whether the signature provided is valid for the provided data
     * @param hash          Hash of the data to be signed
     * @param signature     Signature byte array associated with the provided data hash
     * @return magicValue   bytes4 magic value 0x1626ba7e when function passes
     */
    function isValidSignature(bytes32 hash, bytes memory signature)
        external
        view
        returns (bytes4 magicValue);
}