Contract Source Code (Solidity Standard Json-Input format)

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//SPDX-License-Identifier: BSD 3-Clause
pragma solidity 0.8.13;

import {ISwapWrapper} from "../interfaces/ISwapWrapper.sol";
import {ISwapRouter} from "../lib/ISwapRouter02.sol";
import {ERC20} from "solmate/tokens/ERC20.sol";
import {IWETH9} from "../lib/IWETH9.sol";
import {SafeTransferLib} from "solmate/utils/SafeTransferLib.sol";
import "../lib/uniswap/Path.sol";

contract AutoRouterWrapper is ISwapWrapper {
    using SafeTransferLib for ERC20;
    using BytesLib for bytes;

    /// @notice A deployed SwapRouter02(1.1.0). See https://docs.uniswap.org/protocol/reference/deployments.
    ISwapRouter public immutable swapRouter;

    /// @notice WETH contract.
    IWETH9 public immutable weth;

    /// @notice SwapWrapper name.
    string public name;

    /// @dev Address we use to represent ETH.
    address internal constant eth = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    error TxFailed();
    error OnlyMulticallsAllowed();
    error PathMismatch();
    error UnhandledFunction(bytes4 selector);
    error ETHAmountInMismatch();
    error TotalAmountMismatch();
    error RecipientMismatch(bytes4 selector);
    error TokenInMismatch(bytes4 selector);
    error TokenOutMismatch(bytes4 selector);

    /**
     * @param _name SwapWrapper name.
     * @param _uniV3SwapRouter Deployed Uniswap v3 SwapRouter.
     */
    constructor(string memory _name, address _uniV3SwapRouter) {
        name = _name;
        swapRouter = ISwapRouter(_uniV3SwapRouter);
        weth = IWETH9(swapRouter.WETH9());
    }

    function swap(address _tokenIn, address _tokenOut, address _recipient, uint256 _amount, bytes calldata _data)
        external
        payable
        returns (uint256)
    {
        // If token is ETH and value was sent, ensure the value matches the swap input amount.
        bool _isInputEth = _tokenIn == eth;
        if ((_isInputEth && msg.value != _amount) || (!_isInputEth && msg.value > 0)) {
            revert ETHAmountInMismatch();
        }
        uint256 _prevBalance = getBalance(_tokenOut, _recipient);

        if (!_isInputEth) {
            // If caller isn't sending ETH, we need to transfer in tokens...
            ERC20(_tokenIn).safeTransferFrom(msg.sender, address(this), _amount);
            ERC20(_tokenIn).safeApprove(address(swapRouter), 0);
            ERC20(_tokenIn).safeApprove(address(swapRouter), _amount);
        }

        uint256 _totalAmountIn = _validateData(_tokenIn, _tokenOut, _recipient, _data);
        // _totalAmountIn has been modified by the various `check...()` methods, and should now sum to _amount
        if (_totalAmountIn != _amount) revert TotalAmountMismatch();

        (bool _success,) = address(swapRouter).call{value: _isInputEth ? _amount : 0}(_data);
        if (!_success) revert TxFailed();

        uint256 _amountOut = getBalance(_tokenOut, _recipient) - _prevBalance;
        emit WrapperSwapExecuted(_tokenIn, _tokenOut, msg.sender, _recipient, _totalAmountIn, _amountOut);
        return _amountOut;
    }

    function _validateData(address _tokenIn, address _tokenOut, address _recipient, bytes calldata _data)
        internal
        view
        returns (uint256 _totalAmountIn)
    {
        bytes4 _selector = bytes4(_data[:4]);
        // Check that it's the multicall function that's being called.
        if (_selector != ISwapRouter.multicall.selector) revert OnlyMulticallsAllowed();

        ( /*uint256 deadline*/ , bytes[] memory _calls) = abi.decode(_data[4:], (uint256, bytes[]));

        uint256 _callsLength = _calls.length;
        for (uint256 i = 0; i < _callsLength; i++) {
            bytes memory _call = _calls[i];
            // Get the selector
            _selector = bytes4(_call.slice(0, 4));
            // Remove the selector
            bytes memory _callWithoutSelector = _call.slice(4, _call.length - 4);

            // check TokenIn if it's the first call of a multicall
            bool _checkTokenIn = i == 0;
            // check TokenOut if it's the last call of a multicall
            bool _checkTokenOut = i == _callsLength - 1;

            // Check that selector is an approved selector and validate its arguments.
            if (_selector == ISwapRouter.exactInputSingle.selector) {
                _totalAmountIn += checkExactInputSingle(
                    _callWithoutSelector, _tokenIn, _tokenOut, _recipient, _checkTokenIn, _checkTokenOut
                );
            } else if (_selector == ISwapRouter.exactInput.selector) {
                _totalAmountIn += checkExactInput(
                    _callWithoutSelector, _tokenIn, _tokenOut, _recipient, _checkTokenIn, _checkTokenOut
                );
            } else if (_selector == ISwapRouter.sweepToken.selector) {
                checkSweepToken(_callWithoutSelector, _tokenOut, _recipient);
            } else if (_selector == ISwapRouter.swapExactTokensForTokens.selector) {
                _totalAmountIn += checkSwapExactTokensForTokens(
                    _callWithoutSelector, _tokenIn, _tokenOut, _recipient, _checkTokenIn, _checkTokenOut
                );
            } else if (_selector == ISwapRouter.unwrapWETH9.selector) {
                checkUnwrapWETH9(_callWithoutSelector, _recipient);
            } else {
                revert UnhandledFunction(_selector);
            }
        }
    }

    function checkExactInputSingle(
        bytes memory _data,
        address _tokenInExpected,
        address _tokenOutExpected,
        address _recipientExpected,
        bool _checkTokenIn,
        bool _checkTokenOut
    ) internal view returns (uint256) {
        (
            address _tokenIn,
            address _tokenOut,
            /*uint24 _fee*/
            ,
            address _recipient,
            uint256 _amountIn,
            /*uint256 _amountOutMinimum*/
            ,
            /*uint160 _sqrtPriceLimitX96*/
        ) = abi.decode(_data, (address, address, uint24, address, uint256, uint256, uint160));

        if (_checkTokenIn) {
            bool _tokensMatch = checkTokens(_tokenIn, _tokenInExpected);
            if (!_tokensMatch) revert TokenInMismatch(ISwapRouter.exactInputSingle.selector);
        }
        if (_checkTokenOut) {
            bool _tokensMatch = checkTokens(_tokenOut, _tokenOutExpected);
            if (!_tokensMatch) revert TokenOutMismatch(ISwapRouter.exactInputSingle.selector);
        }
        checkRecipient(_recipient, _recipientExpected, ISwapRouter.exactInputSingle.selector);

        return _amountIn;
    }

    function checkExactInput(
        bytes memory _data,
        address _tokenInExpected,
        address _tokenOutExpected,
        address _recipientExpected,
        bool _checkTokenIn,
        bool _checkTokenOut
    ) internal view returns (uint256) {
        (
            bytes memory _path,
            address _recipient,
            uint256 _amountIn,
            /*uint256 amountOutMinimum*/
            // First 32 bytes point to the location of dynamic bytes _path
        ) = abi.decode(_data.slice(32, _data.length - 32), (bytes, address, uint256, uint256));

        if (_checkTokenIn) {
            (address _tokenA, /*address _tokenB*/,) = Path.decodeFirstPool(_path);
            bool _tokensMatch = checkTokens(_tokenA, _tokenInExpected);
            if (!_tokensMatch) revert TokenInMismatch(ISwapRouter.exactInput.selector);
        }

        if (_checkTokenOut) {
            ( /*address _tokenA*/ , address _tokenB,) = Path.decodeLastPool(_path);
            bool _tokensMatch = checkTokens(_tokenB, _tokenOutExpected);
            if (!_tokensMatch) revert TokenOutMismatch(ISwapRouter.exactInput.selector);
        }
        checkRecipient(_recipient, _recipientExpected, ISwapRouter.exactInput.selector);

        return _amountIn;
    }

    function checkSweepToken(bytes memory _data, address _tokenOutExpected, address _recipientExpected) internal view {
        (address _token, /*uint256 _amountMinimum*/, address _recipient) =
            abi.decode(_data, (address, uint256, address));
        bool _tokensMatch = checkTokens(_token, _tokenOutExpected);
        if (!_tokensMatch) {
            revert TokenOutMismatch(ISwapRouter.sweepToken.selector);
        }
        checkRecipient(_recipient, _recipientExpected, ISwapRouter.sweepToken.selector);
    }

    function checkSwapExactTokensForTokens(
        bytes memory _data,
        address _tokenInExpected,
        address _tokenOutExpected,
        address _recipientExpected,
        bool _checkTokenIn,
        bool _checkTokenOut
    ) internal view returns (uint256) {
        (
            uint256 _amountIn,
            /*uint256 amountOutMin*/
            ,
            address[] memory _path,
            address _recipient
        ) = abi.decode(_data, (uint256, uint256, address[], address));

        if (_checkTokenIn) {
            bool _tokensMatch = checkTokens(_path[0], _tokenInExpected);
            if (!_tokensMatch) revert TokenInMismatch(ISwapRouter.swapExactTokensForTokens.selector);
        }
        if (_checkTokenOut) {
            bool _tokensMatch = checkTokens(_path[_path.length - 1], _tokenOutExpected);
            if (!_tokensMatch) revert TokenOutMismatch(ISwapRouter.swapExactTokensForTokens.selector);
        }
        checkRecipient(_recipient, _recipientExpected, ISwapRouter.swapExactTokensForTokens.selector);

        return _amountIn;
    }

    function checkUnwrapWETH9(bytes memory _data, address _recipientExpected) internal pure {
        ( /*uint256 amountOutMin*/ , address _recipient) = abi.decode(_data, (uint256, address));
        checkRecipient(_recipient, _recipientExpected, ISwapRouter.unwrapWETH9.selector);
    }

    function checkRecipient(address _recipient, address _recipientExpected, bytes4 _selector) internal pure {
        if (_selector == ISwapRouter.sweepToken.selector || _selector == ISwapRouter.unwrapWETH9.selector) {
            if (_recipient != _recipientExpected) revert RecipientMismatch(_selector);
        } else {
            // address(2) is a flag for identifying address(this).
            // See https://github.com/Uniswap/swap-router-contracts/blob/9dc4a9cce101be984e148e1af6fe605ebcfa658a/contracts/libraries/Constants.sol#L14
            if (_recipient != _recipientExpected && _recipient != address(2)) {
                revert RecipientMismatch(_selector);
            }
        }
    }

    function getBalance(address _tokenOut, address _recipient) internal view returns (uint256) {
        if (_tokenOut == address(eth)) {
            return address(_recipient).balance;
        } else {
            return ERC20(_tokenOut).balanceOf(address(_recipient));
        }
    }

    // Return true if two tokens match, OR if _tokenExpected is eth, token must be weth.
    function checkTokens(address _token, address _tokenExpected) internal view returns (bool) {
        // `TokenIn` should never == eth by the time this check is reached.
        return _token == _tokenExpected || (_tokenExpected == eth ? _token == address(weth) : false);
    }

    /// @notice Required to receive ETH on `weth.withdraw()`
    receive() external payable {}
}

//SPDX-License-Identifier: BSD 3-Clause
pragma solidity >=0.8.0;

error ETHAmountInMismatch();

/**
 * @notice ISwapWrapper is the interface that all swap wrappers should implement.
 * This will be used to support swap protocols like Uniswap V2 and V3, Sushiswap, 1inch, etc.
 */
interface ISwapWrapper {
    /// @notice Event emitted after a successful swap.
    event WrapperSwapExecuted(
        address indexed tokenIn,
        address indexed tokenOut,
        address sender,
        address indexed recipient,
        uint256 amountIn,
        uint256 amountOut
    );

    /// @notice Name of swap wrapper for UX readability.
    function name() external returns (string memory);

    /**
     * @notice Swap function. Generally we expect the implementer to call some exactAmountIn-like swap method, and so the documentation
     * is written with this in mind. However, the method signature is general enough to support exactAmountOut swaps as well.
     * @param _tokenIn Token to be swapped (or 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE for ETH).
     * @param _tokenOut Token to receive (or 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE for ETH).
     * @param _recipient Receiver of `_tokenOut`.
     * @param _amount Amount of `_tokenIn` that should be swapped.
     * @param _data Additional data that the swap wrapper may require to execute the swap.
     * @return Amount of _tokenOut received.
     */
    function swap(address _tokenIn, address _tokenOut, address _recipient, uint256 _amount, bytes calldata _data)
        external
        payable
        returns (uint256);
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity ^0.8.13;

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 amountIn;
        uint256 amountOutMinimum;
        uint160 sqrtPriceLimitX96;
    }

    struct ExactInputParams {
        bytes path;
        address recipient;
        uint256 amountIn;
        uint256 amountOutMinimum;
    }

    function exactInput(ExactInputParams memory params) external payable returns (uint256 amountOut);

    function exactInputSingle(ExactInputSingleParams calldata params) external payable returns (uint256 amountOut);

    function multicall(uint256 deadline, bytes[] calldata data) external payable returns (bytes[] memory);

    function sweepToken(address token, uint256 amountMinimum, address recipient) external payable;

    function unwrapWETH9WithFee(uint256 amountMinimum, address recipient, uint256 feeBips, address feeRecipient)
        external
        payable;

    function wrapETH(uint256 value) external payable;

    function unwrapWETH9(uint256 amountMinimum, address recipient) external payable;

    function WETH9() external view returns (address payable);

    //V2 Periphery
    function swapExactTokensForTokens(uint256 amountIn, uint256 amountOutMin, address[] calldata path, address to)
        external
        payable
        returns (uint256 amountOut);
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

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

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

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

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

    string public name;

    string public symbol;

    uint8 public immutable decimals;

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

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

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

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

    bytes32 public constant PERMIT_TYPEHASH =
        keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

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

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

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

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

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

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

        return true;
    }

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

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

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

        return true;
    }

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

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

        balanceOf[from] -= amount;

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

        emit Transfer(from, to, amount);

        return true;
    }

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

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

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            bytes32 digest = keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    DOMAIN_SEPARATOR(),
                    keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
                )
            );

            address recoveredAddress = ecrecover(digest, v, r, s);

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

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: BSD-2-Clause
// !! THIS FILE WAS AUTOGENERATED BY abi-to-sol v0.5.2. SEE SOURCE BELOW. !!
pragma solidity 0.8.13;

interface IWETH9 {
    function name() external view returns (string memory);

    function approve(address guy, uint256 wad) external returns (bool);

    function totalSupply() external view returns (uint256);

    function transferFrom(address src, address dst, uint256 wad) external returns (bool);

    function withdraw(uint256 wad) external;

    function decimals() external view returns (uint8);

    function balanceOf(address) external view returns (uint256);

    function symbol() external view returns (string memory);

    function transfer(address dst, uint256 wad) external returns (bool);

    function deposit() external payable;

    function allowance(address, address) external view returns (uint256);

    event Approval(address indexed src, address indexed guy, uint256 wad);
    event Transfer(address indexed src, address indexed dst, uint256 wad);
    event Deposit(address indexed dst, uint256 wad);
    event Withdrawal(address indexed src, uint256 wad);
}

// THIS FILE WAS AUTOGENERATED FROM THE FOLLOWING ABI JSON:
/*
[{"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"name":"guy","type":"address"},{"name":"wad","type":"uint256"}],"name":"approve","outputs":[{"name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"name":"src","type":"address"},{"name":"dst","type":"address"},{"name":"wad","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"wad","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"name":"","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"name":"dst","type":"address"},{"name":"wad","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"deposit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"name":"","type":"address"},{"name":"","type":"address"}],"name":"allowance","outputs":[{"name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"src","type":"address"},{"indexed":true,"name":"guy","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"src","type":"address"},{"indexed":true,"name":"dst","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"dst","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"src","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Withdrawal","type":"event"}]*/

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import {ERC20} from "../tokens/ERC20.sol";

/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/utils/SafeTransferLib.sol)
/// @author Modified from Gnosis (https://github.com/gnosis/gp-v2-contracts/blob/main/src/contracts/libraries/GPv2SafeERC20.sol)
/// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer.
library SafeTransferLib {
    /*///////////////////////////////////////////////////////////////
                            ETH OPERATIONS
    //////////////////////////////////////////////////////////////*/

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

        assembly {
            // Transfer the ETH and store if it succeeded or not.
            callStatus := call(gas(), to, amount, 0, 0, 0, 0)
        }

        require(callStatus, "ETH_TRANSFER_FAILED");
    }

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

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

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

            // Write the abi-encoded calldata to memory piece by piece:
            mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000) // Begin with the function selector.
            mstore(add(freeMemoryPointer, 4), and(from, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "from" argument.
            mstore(add(freeMemoryPointer, 36), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "to" argument.
            mstore(add(freeMemoryPointer, 68), amount) // Finally append the "amount" argument. No mask as it's a full 32 byte value.

            // Call the token and store if it succeeded or not.
            // We use 100 because the calldata length is 4 + 32 * 3.
            callStatus := call(gas(), token, 0, freeMemoryPointer, 100, 0, 0)
        }

        require(didLastOptionalReturnCallSucceed(callStatus), "TRANSFER_FROM_FAILED");
    }

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

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

            // Write the abi-encoded calldata to memory piece by piece:
            mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000) // Begin with the function selector.
            mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Finally append the "amount" argument. No mask as it's a full 32 byte value.

            // Call the token and store if it succeeded or not.
            // We use 68 because the calldata length is 4 + 32 * 2.
            callStatus := call(gas(), token, 0, freeMemoryPointer, 68, 0, 0)
        }

        require(didLastOptionalReturnCallSucceed(callStatus), "TRANSFER_FAILED");
    }

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

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

            // Write the abi-encoded calldata to memory piece by piece:
            mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000) // Begin with the function selector.
            mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Finally append the "amount" argument. No mask as it's a full 32 byte value.

            // Call the token and store if it succeeded or not.
            // We use 68 because the calldata length is 4 + 32 * 2.
            callStatus := call(gas(), token, 0, freeMemoryPointer, 68, 0, 0)
        }

        require(didLastOptionalReturnCallSucceed(callStatus), "APPROVE_FAILED");
    }

    /*///////////////////////////////////////////////////////////////
                         INTERNAL HELPER LOGIC
    //////////////////////////////////////////////////////////////*/

    function didLastOptionalReturnCallSucceed(bool callStatus) private pure returns (bool success) {
        assembly {
            // Get how many bytes the call returned.
            let returnDataSize := returndatasize()

            // If the call reverted:
            if iszero(callStatus) {
                // Copy the revert message into memory.
                returndatacopy(0, 0, returnDataSize)

                // Revert with the same message.
                revert(0, returnDataSize)
            }

            switch returnDataSize
            case 32 {
                // Copy the return data into memory.
                returndatacopy(0, 0, returnDataSize)

                // Set success to whether it returned true.
                success := iszero(iszero(mload(0)))
            }
            case 0 {
                // There was no return data.
                success := 1
            }
            default {
                // It returned some malformed input.
                success := 0
            }
        }
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.6.0;

import "./BytesLib.sol";

/// @title MODIFIED FILE: Functions for manipulating path data for multihop swaps
/// @notice Additional `decodeLastPool` method was added to the orignal file linked below.
/// @notice Link: https://github.com/Uniswap/v3-periphery/blob/b325bb0905d922ae61fcc7df85ee802e8df5e96c/contracts/libraries/Path.sol
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 Returns the number of pools in the path
    /// @param path The encoded swap path
    /// @return The number of pools in the path
    function numPools(bytes memory path) internal pure returns (uint256) {
        // Ignore the first token address. From then on every fee and token offset indicates a pool.
        return ((path.length - ADDR_SIZE) / NEXT_OFFSET);
    }

    /// @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 Gets the segment corresponding to the first pool in the path
    /// @param path The bytes encoded swap path
    /// @return The segment containing all data necessary to target the first pool in the path
    function getFirstPool(bytes memory path) internal pure returns (bytes memory) {
        return path.slice(0, POP_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);
    }

    /// @notice Custom method we've added: Decodes the last 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 decodeLastPool(bytes memory path) internal pure returns (address tokenA, address tokenB, uint24 fee) {
        path = path.slice(path.length - POP_OFFSET, POP_OFFSET);
        tokenA = path.toAddress(0);
        fee = path.toUint24(ADDR_SIZE);
        tokenB = path.toAddress(NEXT_OFFSET);
    }
}

// Sourced from https://github.com/Uniswap/v3-core/blob/ed88be38ab2032d82bf10ac6f8d03aa631889d48/contracts/interfaces/callback/IUniswapV3SwapCallback.sol
// Modified solidity pragma.

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.8.13;

/// @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;
}

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * @title Solidity Bytes Arrays Utils
 * @author Gonçalo Sá <[email protected]>
 *
 * @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity.
 *      The library lets you concatenate, slice and type cast bytes arrays both in memory and storage.
 * @notice Link: https://github.com/Uniswap/v3-periphery/blob/b325bb0905d922ae61fcc7df85ee802e8df5e96c/contracts/libraries/BytesLib.sol
 */
pragma solidity >=0.8.0 <0.9.0;

library BytesLib {
    function slice(bytes memory _bytes, uint256 _start, uint256 _length) internal pure returns (bytes memory) {
        require(_length + 31 >= _length, "slice_overflow");
        require(_bytes.length >= _start + _length, "slice_outOfBounds");

        bytes memory tempBytes;

        assembly {
            switch iszero(_length)
            case 0 {
                // Get a location of some free memory and store it in tempBytes as
                // Solidity does for memory variables.
                tempBytes := mload(0x40)

                // The first word of the slice result is potentially a partial
                // word read from the original array. To read it, we calculate
                // the length of that partial word and start copying that many
                // bytes into the array. The first word we copy will start with
                // data we don't care about, but the last `lengthmod` bytes will
                // land at the beginning of the contents of the new array. When
                // we're done copying, we overwrite the full first word with
                // the actual length of the slice.
                let lengthmod := and(_length, 31)

                // The multiplication in the next line is necessary
                // because when slicing multiples of 32 bytes (lengthmod == 0)
                // the following copy loop was copying the origin's length
                // and then ending prematurely not copying everything it should.
                let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod)))
                let end := add(mc, _length)

                for {
                    // The multiplication in the next line has the same exact purpose
                    // as the one above.
                    let cc := add(add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))), _start)
                } lt(mc, end) {
                    mc := add(mc, 0x20)
                    cc := add(cc, 0x20)
                } { mstore(mc, mload(cc)) }

                mstore(tempBytes, _length)

                //update free-memory pointer
                //allocating the array padded to 32 bytes like the compiler does now
                mstore(0x40, and(add(mc, 31), not(31)))
            }
            //if we want a zero-length slice let's just return a zero-length array
            default {
                tempBytes := mload(0x40)
                //zero out the 32 bytes slice we are about to return
                //we need to do it because Solidity does not garbage collect
                mstore(tempBytes, 0)

                mstore(0x40, add(tempBytes, 0x20))
            }
        }

        return tempBytes;
    }

    function toAddress(bytes memory _bytes, uint256 _start) internal pure returns (address) {
        require(_bytes.length >= _start + 20, "toAddress_outOfBounds");
        address tempAddress;

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

        return tempAddress;
    }

    function 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;
    }
}

{
  "remappings": [
    "ds-test/=lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "murky/=lib/murky/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "solmate/=lib/solmate/src/",
    "weird-erc20/=lib/solmate/lib/weird-erc20/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 9999999
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"address","name":"_uniV3SwapRouter","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"ETHAmountInMismatch","type":"error"},{"inputs":[],"name":"OnlyMulticallsAllowed","type":"error"},{"inputs":[],"name":"PathMismatch","type":"error"},{"inputs":[{"internalType":"bytes4","name":"selector","type":"bytes4"}],"name":"RecipientMismatch","type":"error"},{"inputs":[{"internalType":"bytes4","name":"selector","type":"bytes4"}],"name":"TokenInMismatch","type":"error"},{"inputs":[{"internalType":"bytes4","name":"selector","type":"bytes4"}],"name":"TokenOutMismatch","type":"error"},{"inputs":[],"name":"TotalAmountMismatch","type":"error"},{"inputs":[],"name":"TxFailed","type":"error"},{"inputs":[{"internalType":"bytes4","name":"selector","type":"bytes4"}],"name":"UnhandledFunction","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"tokenIn","type":"address"},{"indexed":true,"internalType":"address","name":"tokenOut","type":"address"},{"indexed":false,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountIn","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amountOut","type":"uint256"}],"name":"WrapperSwapExecuted","type":"event"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenIn","type":"address"},{"internalType":"address","name":"_tokenOut","type":"address"},{"internalType":"address","name":"_recipient","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"swap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"swapRouter","outputs":[{"internalType":"contract ISwapRouter","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"weth","outputs":[{"internalType":"contract IWETH9","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000000000000000000000000000000000000000004000000000000000000000000068b3465833fb72a70ecdf485e0e4c7bd8665fc45000000000000000000000000000000000000000000000000000000000000001a556e6973776170204175746f526f757465722057726170706572000000000000

-----Decoded View---------------
Arg [0] : _name (string): Uniswap AutoRouter Wrapper
Arg [1] : _uniV3SwapRouter (address): 0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [1] : 00000000000000000000000068b3465833fb72a70ecdf485e0e4c7bd8665fc45
Arg [2] : 000000000000000000000000000000000000000000000000000000000000001a
Arg [3] : 556e6973776170204175746f526f757465722057726170706572000000000000