Contract 0x00000000009726632680fb29d3f7a9734e3010e2 15

/*

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                                                                    ____ ____  __ _______ ____


    /$$$$$$                                           /$$$$$$                                                                /$$                        
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                                    | $$                       /$$  \ $$ /$$  \ $$                     /$$  \ $$                                        
                                    | $$                      |  $$$$$$/|  $$$$$$/                    |  $$$$$$/                                        
                                    |__/                       \______/  \______/                      \______/                                         
                
     
*/

//SPDX-License-Identifier: GPL-3.0
pragma solidity =0.8.11;
import "@rari-capital/solmate/src/utils/SafeTransferLib.sol";
import "@rari-capital/solmate/src/tokens/ERC20.sol";
import "./routers/BaseAggregator.sol";

/// @title Rainbow swap aggregator contract
contract RainbowRouter is BaseAggregator {
    /// @dev The address that is the current owner of this contract
    address public owner;

    /// @dev Event emitted when the owner changes
    event OwnerChanged(address indexed newOwner, address indexed oldOwner);

    /// @dev Event emitted when a swap target gets added
    event SwapTargetAdded(address indexed target);

    /// @dev Event emitted when a swap target gets removed
    event SwapTargetRemoved(address indexed target);

    /// @dev Event emitted when token fees are withdrawn
    event TokenWithdrawn(
        address indexed token,
        address indexed target,
        uint256 amount
    );

    /// @dev Event emitted when ETH fees are withdrawn
    event EthWithdrawn(address indexed target, uint256 amount);

    /// @dev modifier that ensures only the owner is allowed to call a specific method
    modifier onlyOwner() {
        require(msg.sender == owner, "ONLY_OWNER");
        _;
    }

    constructor() {
        owner = msg.sender;
        status = 1;
    }

    /// @dev We don't want to accept any ETH, except refunds from aggregators
    /// or the owner (for testing purposes), which can also withdraw
    /// This is done by evaluating the value of status, which is set to 2
    /// only during swaps due to the "nonReentrant" modifier
    receive() external payable {
        require(status == 2 || msg.sender == owner, "NO_RECEIVE");
    }

    /// @dev method to add or remove swap targets from swapTargets
    /// This is required so we only approve "trusted" swap targets
    /// to transfer tokens out of this contract
    /// @param target address of the swap target to add
    /// @param add flag to add or remove the swap target
    function updateSwapTargets(address target, bool add) external onlyOwner {
        swapTargets[target] = add;
        if (add) {
            emit SwapTargetAdded(target);
        } else {
            emit SwapTargetRemoved(target);
        }
    }

    /// @dev method to withdraw ERC20 tokens (from the fees)
    /// @param token address of the token to withdraw
    /// @param to address that's receiving the tokens
    /// @param amount amount of tokens to withdraw
    function withdrawToken(
        address token,
        address to,
        uint256 amount
    ) external onlyOwner {
        require(to != address(0), "ZERO_ADDRESS");
        SafeTransferLib.safeTransfer(ERC20(token), to, amount);
        emit TokenWithdrawn(token, to, amount);
    }

    /// @dev method to withdraw ETH (from the fees)
    /// @param to address that's receiving the ETH
    /// @param amount amount of ETH to withdraw
    function withdrawEth(address to, uint256 amount) external onlyOwner {
        require(to != address(0), "ZERO_ADDRESS");
        SafeTransferLib.safeTransferETH(to, amount);
        emit EthWithdrawn(to, amount);
    }

    /// @dev Transfers ownership of the contract to a new account (`newOwner`).
    /// @param newOwner address of the new owner
    /// Can only be called by the current owner.
    function transferOwnership(address newOwner) external virtual onlyOwner {
        require(newOwner != address(0), "ZERO_ADDRESS");
        require(newOwner != owner, "SAME_OWNER");
        address previousOwner = owner;
        owner = newOwner;
        emit OwnerChanged(newOwner, previousOwner);
    }
}

// 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: 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: GPL-3.0
pragma solidity =0.8.11;

import "@rari-capital/solmate/src/utils/SafeTransferLib.sol";
import "@rari-capital/solmate/src/tokens/ERC20.sol";
import "../libraries/PermitHelper.sol";

/// @title Rainbow base aggregator contract
contract BaseAggregator {
    /// @dev Used to prevent re-entrancy
    uint256 internal status;

    /// @dev Set of allowed swapTargets.
    mapping(address => bool) public swapTargets;

    /// @dev modifier that prevents reentrancy attacks on specific methods
    modifier nonReentrant() {
        // On the first call to nonReentrant, status will be 1
        require(status != 2, "NON_REENTRANT");

        // Any calls to nonReentrant after this point will fail
        status = 2;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        status = 1;
    }

    /// @dev modifier that ensures only approved targets can be called
    modifier onlyApprovedTarget(address target) {
        require(swapTargets[target], "TARGET_NOT_AUTH");
        _;
    }

    /** EXTERNAL **/

    /// @param buyTokenAddress the address of token that the user should receive
    /// @param target the address of the aggregator contract that will exec the swap
    /// @param swapCallData the calldata that will be passed to the aggregator contract
    /// @param feeAmount the amount of ETH that we will take as a fee
    function fillQuoteEthToToken(
        address buyTokenAddress,
        address payable target,
        bytes calldata swapCallData,
        uint256 feeAmount
    ) external payable nonReentrant onlyApprovedTarget(target) {
        // 1 - Get the initial balances
        uint256 initialTokenBalance = ERC20(buyTokenAddress).balanceOf(
            address(this)
        );
        uint256 initialEthAmount = address(this).balance - msg.value;
        uint256 sellAmount = msg.value - feeAmount;

        // 2 - Call the encoded swap function call on the contract at `target`,
        // passing along any ETH attached to this function call to cover protocol fees
        // minus our fees, which are kept in this contract
        (bool success, bytes memory res) = target.call{value: sellAmount}(
            swapCallData
        );

        // Get the revert message of the call and revert with it if the call failed
        if (!success) {
            assembly {
                let returndata_size := mload(res)
                revert(add(32, res), returndata_size)
            }
        }

        // 3 - Make sure we received the tokens
        {
            uint256 finalTokenBalance = ERC20(buyTokenAddress).balanceOf(
                address(this)
            );
            require(initialTokenBalance < finalTokenBalance, "NO_TOKENS");
        }

        // 4 - Send the received tokens back to the user
        SafeTransferLib.safeTransfer(
            ERC20(buyTokenAddress),
            msg.sender,
            ERC20(buyTokenAddress).balanceOf(address(this)) -
                initialTokenBalance
        );

        // 5 - Return the remaining ETH to the user (if any)
        {
            uint256 finalEthAmount = address(this).balance - feeAmount;
            if (finalEthAmount > initialEthAmount) {
                SafeTransferLib.safeTransferETH(
                    msg.sender,
                    finalEthAmount - initialEthAmount
                );
            }
        }
    }

    /// @param sellTokenAddress the address of token that the user is selling
    /// @param buyTokenAddress the address of token that the user should receive
    /// @param target the address of the aggregator contract that will exec the swap
    /// @param swapCallData the calldata that will be passed to the aggregator contract
    /// @param sellAmount the amount of tokens that the user is selling
    /// @param feeAmount the amount of the tokens to sell that we will take as a fee
    function fillQuoteTokenToToken(
        address sellTokenAddress,
        address buyTokenAddress,
        address payable target,
        bytes calldata swapCallData,
        uint256 sellAmount,
        uint256 feeAmount
    ) external payable nonReentrant onlyApprovedTarget(target) {
        _fillQuoteTokenToToken(
            sellTokenAddress,
            buyTokenAddress,
            target,
            swapCallData,
            sellAmount,
            feeAmount
        );
    }

    /// @dev method that executes ERC20 to ERC20 token swaps with the ability to take a fee from the input
    // and accepts a signature to use permit, so the user doesn't have to make an previous approval transaction
    /// @param sellTokenAddress the address of token that the user is selling
    /// @param buyTokenAddress the address of token that the user should receive
    /// @param target the address of the aggregator contract that will exec the swap
    /// @param swapCallData the calldata that will be passed to the aggregator contract
    /// @param sellAmount the amount of tokens that the user is selling
    /// @param feeAmount the amount of the tokens to sell that we will take as a fee
    /// @param permitData struct containing the value, nonce, deadline, v, r and s values of the permit data
    function fillQuoteTokenToTokenWithPermit(
        address sellTokenAddress,
        address buyTokenAddress,
        address payable target,
        bytes calldata swapCallData,
        uint256 sellAmount,
        uint256 feeAmount,
        PermitHelper.Permit calldata permitData
    ) external payable nonReentrant onlyApprovedTarget(target) {
        // 1 - Apply permit
        PermitHelper.permit(
            permitData,
            sellTokenAddress,
            msg.sender,
            address(this)
        );

        //2 - Call fillQuoteTokenToToken
        _fillQuoteTokenToToken(
            sellTokenAddress,
            buyTokenAddress,
            target,
            swapCallData,
            sellAmount,
            feeAmount
        );
    }

    /// @dev method that executes ERC20 to ETH token swaps with the ability to take a fee from the output
    /// @param sellTokenAddress the address of token that the user is selling
    /// @param target the address of the aggregator contract that will exec the swap
    /// @param swapCallData the calldata that will be passed to the aggregator contract
    /// @param sellAmount the amount of tokens that the user is selling
    /// @param feePercentageBasisPoints the amount of ETH that we will take as a fee in 1e18 basis points (basis points with 4 decimals plus 14 extra decimals of precision)
    function fillQuoteTokenToEth(
        address sellTokenAddress,
        address payable target,
        bytes calldata swapCallData,
        uint256 sellAmount,
        uint256 feePercentageBasisPoints
    ) external payable nonReentrant onlyApprovedTarget(target) {
        _fillQuoteTokenToEth(
            sellTokenAddress,
            target,
            swapCallData,
            sellAmount,
            feePercentageBasisPoints
        );
    }

    /// @dev method that executes ERC20 to ETH token swaps with the ability to take a fee from the output
    // and accepts a signature to use permit, so the user doesn't have to make an previous approval transaction
    /// @param sellTokenAddress the address of token that the user is selling
    /// @param target the address of the aggregator contract that will exec the swap
    /// @param swapCallData the calldata that will be passed to the aggregator contract
    /// @param sellAmount the amount of tokens that the user is selling
    /// @param feePercentageBasisPoints the amount of ETH that we will take as a fee in 1e18 basis points (basis points with 4 decimals plus 14 extra decimals of precision)
    /// @param permitData struct containing the amount, nonce, deadline, v, r and s values of the permit data
    function fillQuoteTokenToEthWithPermit(
        address sellTokenAddress,
        address payable target,
        bytes calldata swapCallData,
        uint256 sellAmount,
        uint256 feePercentageBasisPoints,
        PermitHelper.Permit calldata permitData
    ) external payable nonReentrant onlyApprovedTarget(target) {
        // 1 - Apply permit
        PermitHelper.permit(
            permitData,
            sellTokenAddress,
            msg.sender,
            address(this)
        );

        // 2 - call fillQuoteTokenToEth
        _fillQuoteTokenToEth(
            sellTokenAddress,
            target,
            swapCallData,
            sellAmount,
            feePercentageBasisPoints
        );
    }

    /** INTERNAL **/

    /// @dev internal method that executes ERC20 to ETH token swaps with the ability to take a fee from the output
    function _fillQuoteTokenToEth(
        address sellTokenAddress,
        address payable target,
        bytes calldata swapCallData,
        uint256 sellAmount,
        uint256 feePercentageBasisPoints
    ) internal {
        // 1 - Get the initial ETH amount
        uint256 initialEthAmount = address(this).balance - msg.value;

        // 2 - Move the tokens to this contract
        // NOTE: This implicitly assumes that the the necessary approvals have been granted
        // from msg.sender to the BaseAggregator
        SafeTransferLib.safeTransferFrom(
            ERC20(sellTokenAddress),
            msg.sender,
            address(this),
            sellAmount
        );

        // 3 - Approve the aggregator's contract to swap the tokens
        SafeTransferLib.safeApprove(
            ERC20(sellTokenAddress),
            target,
            sellAmount
        );

        // 4 - Call the encoded swap function call on the contract at `target`,
        // passing along any ETH attached to this function call to cover protocol fees.
        (bool success, bytes memory res) = target.call{value: msg.value}(
            swapCallData
        );

        // Get the revert message of the call and revert with it if the call failed
        if (!success) {
            assembly {
                let returndata_size := mload(res)
                revert(add(32, res), returndata_size)
            }
        }

        // 5 - Check that the tokens were fully spent during the swap
        uint256 allowance = ERC20(sellTokenAddress).allowance(
            address(this),
            target
        );
        require(allowance == 0, "ALLOWANCE_NOT_ZERO");

        // 6 - Subtract the fees and send the rest to the user
        // Fees will be held in this contract
        uint256 finalEthAmount = address(this).balance;
        uint256 ethDiff = finalEthAmount - initialEthAmount;

        require(ethDiff > 0, "NO_ETH_BACK");

        if (feePercentageBasisPoints > 0) {
            uint256 fees = (ethDiff * feePercentageBasisPoints) / 1e18;
            uint256 amountMinusFees = ethDiff - fees;
            SafeTransferLib.safeTransferETH(msg.sender, amountMinusFees);
            // when there's no fee, 1inch sends the funds directly to the user
            // we check to prevent sending 0 ETH in that case
        } else if (ethDiff > 0) {
            SafeTransferLib.safeTransferETH(msg.sender, ethDiff);
        }
    }

    /// @dev internal method that executes ERC20 to ERC20 token swaps with the ability to take a fee from the input
    function _fillQuoteTokenToToken(
        address sellTokenAddress,
        address buyTokenAddress,
        address payable target,
        bytes calldata swapCallData,
        uint256 sellAmount,
        uint256 feeAmount
    ) internal {
        // 1 - Get the initial output token balance
        uint256 initialOutputTokenAmount = ERC20(buyTokenAddress).balanceOf(
            address(this)
        );

        // 2 - Move the tokens to this contract (which includes our fees)
        // NOTE: This implicitly assumes that the the necessary approvals have been granted
        // from msg.sender to the BaseAggregator
        SafeTransferLib.safeTransferFrom(
            ERC20(sellTokenAddress),
            msg.sender,
            address(this),
            sellAmount
        );

        // 3 - Approve the aggregator's contract to swap the tokens if needed
        SafeTransferLib.safeApprove(
            ERC20(sellTokenAddress),
            target,
            sellAmount - feeAmount
        );

        // 4 - Call the encoded swap function call on the contract at `target`,
        // passing along any ETH attached to this function call to cover protocol fees.
        (bool success, bytes memory res) = target.call{value: msg.value}(
            swapCallData
        );

        // Get the revert message of the call and revert with it if the call failed
        if (!success) {
            assembly {
                let returndata_size := mload(res)
                revert(add(32, res), returndata_size)
            }
        }

        // 5 - Check that the tokens were fully spent during the swap
        uint256 allowance = ERC20(sellTokenAddress).allowance(
            address(this),
            target
        );
        require(allowance == 0, "ALLOWANCE_NOT_ZERO");

        // 6 - Make sure we received the tokens
        uint256 finalOutputTokenAmount = ERC20(buyTokenAddress).balanceOf(
            address(this)
        );
        require(initialOutputTokenAmount < finalOutputTokenAmount, "NO_TOKENS");

        // 7 - Send tokens to the user
        SafeTransferLib.safeTransfer(
            ERC20(buyTokenAddress),
            msg.sender,
            finalOutputTokenAmount - initialOutputTokenAmount
        );
    }
}

//SPDX-License-Identifier: GPL-3.0
pragma solidity =0.8.11;
import "../interfaces/IERC2612.sol";
import "../interfaces/IDAI.sol";

/// @title PermitHelper
/// @dev Helper methods for using ERC20 Permit (ERC2612 or DAI/CHAI like)
library PermitHelper {
    struct Permit {
        uint256 value;
        uint256 nonce;
        uint256 deadline;
        bool isDaiStylePermit;
        uint8 v;
        bytes32 r;
        bytes32 s;
    }

    /// @dev permit method helper that will handle both known implementations
    // DAI vs ERC2612 tokens
    /// @param permitData bytes containing the encoded permit signature
    /// @param tokenAddress address of the token that will be permitted
    /// @param holder address that holds the tokens to be permitted
    /// @param spender address that will be permitted to spend the tokens
    function permit(
        Permit memory permitData,
        address tokenAddress,
        address holder,
        address spender
    ) internal {
        if (permitData.isDaiStylePermit) {
            IDAI(tokenAddress).permit(
                holder,
                spender,
                permitData.nonce,
                permitData.deadline,
                true,
                permitData.v,
                permitData.r,
                permitData.s
            );
        } else {
            IERC2612(tokenAddress).permit(
                holder,
                spender,
                permitData.value,
                permitData.deadline,
                permitData.v,
                permitData.r,
                permitData.s
            );
        }
    }
}

//SPDX-License-Identifier: GPL-3.0
pragma solidity =0.8.11;

import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol";

interface IERC2612 is IERC20Metadata, IERC20Permit {
    function _nonces(address owner) external view returns (uint256);

    function version() external view returns (string memory);
}

//SPDX-License-Identifier: GPL-3.0
pragma solidity =0.8.11;

import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@uniswap/v3-periphery/contracts/interfaces/external/IERC20PermitAllowed.sol";

interface IDAI is IERC20Metadata, IERC20PermitAllowed {
    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function version() external view returns (string memory);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

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

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

/// @title Interface for permit
/// @notice Interface used by DAI/CHAI for permit
interface IERC20PermitAllowed {
    /// @notice Approve the spender to spend some tokens via the holder signature
    /// @dev This is the permit interface used by DAI and CHAI
    /// @param holder The address of the token holder, the token owner
    /// @param spender The address of the token spender
    /// @param nonce The holder's nonce, increases at each call to permit
    /// @param expiry The timestamp at which the permit is no longer valid
    /// @param allowed Boolean that sets approval amount, true for type(uint256).max and false for 0
    /// @param v Must produce valid secp256k1 signature from the holder along with `r` and `s`
    /// @param r Must produce valid secp256k1 signature from the holder along with `v` and `s`
    /// @param s Must produce valid secp256k1 signature from the holder along with `r` and `v`
    function permit(
        address holder,
        address spender,
        uint256 nonce,
        uint256 expiry,
        bool allowed,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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