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// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.12;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./lib/MessageSenderLib.sol";
import "./lib/MessageReceiverApp.sol";
import "./lib/MsgDataTypes.sol";
import "./FeeOperator.sol";
import "./SigVerifier.sol";
import "./Swapper.sol";
import "./interfaces/ICodec.sol";

/**
 * @author Chainhop Dex Team
 * @author Padoriku
 * @title An app that enables swapping on a chain, transferring to another chain and swapping
 * another time on the destination chain before sending the result tokens to a user
 */
contract TransferSwapper is MessageReceiverApp, Swapper, SigVerifier, FeeOperator, ReentrancyGuard {
    using SafeERC20 for IERC20;
    using ECDSA for bytes32;

    struct TransferDescription {
        address receiver; // the receiving party (the user) of the final output token
        uint64 dstChainId; // destination chain id
        uint32 maxBridgeSlippage; // user defined maximum allowed slippage (pip) at bridge
        MsgDataTypes.BridgeSendType bridgeType; // type of the bridge to use
        uint64 nonce; // nonce is needed for de-dup tx at this contract and bridge
        bool nativeIn; // whether to check msg.value and wrap token before swapping/sending
        bool nativeOut; // whether to unwrap before sending the final token to user
        uint256 fee; // this fee is only executor fee. it does not include msg bridge fee
        uint256 feeDeadline; // the unix timestamp before which the fee is valid
        // sig of sha3("executor fee", srcChainId, dstChainId, amountIn, tokenIn, feeDeadline, fee)
        // see _verifyFee()
        bytes feeSig;
        // IMPORTANT: amountIn and tokenIn are completely ignored if src chain has a swap
        // these two fields are only meant for the scenario where no swaps are needed on src chain
        uint256 amountIn;
        address tokenIn;
        address dstTokenOut; // the final output token, emitted in event for display purpose only
        // in case of multi route swaps, whether to allow the successful swaps to go through
        // and sending the amountIn of the failed swaps back to user
        bool allowPartialFill;
    }

    struct Request {
        bytes32 id; // see _computeId()
        ICodec.SwapDescription[] swaps; // the swaps need to happen on the destination chain
        address receiver; // see TransferDescription.receiver
        bool nativeOut; // see TransferDescription.nativeOut
        uint256 fee; // see TransferDescription.fee
        bool allowPartialFill; // see TransferDescription.allowPartialFill
    }

    /**
     * @notice Denotes the status of a cross-chain transfer/swap request
     * @dev Partially filled requests are considered 'Succeeded'. There is no 'Failed' state as
     * it's only possible if everything reverts and there is no successful transaction
     * @param Null An empty status that should never be reached
     * @param Succeeded Transfer/swap has succeeded and funds are received by the receiver
     * @param Fallback Swaps have failed on the dst chain, and bridge tokens are refunded to receiver
     */
    enum RequestStatus {
        Null,
        Succeeded,
        Fallback
    }

    event NativeWrapUpdated(address nativeWrap);

    /**
     * @notice Emitted when requested dstChainId == srcChainId, no bridging
     * @param id see _computeId()
     * @param amountIn the input amount approved by the sender
     * @param tokenIn the input token approved by the sender
     * @param amountOut the output amount gained after swapping using the input tokens
     * @param tokenOut the output token gained after swapping using the input tokens
     */
    event DirectSwap(bytes32 id, uint256 amountIn, address tokenIn, uint256 amountOut, address tokenOut);

    /**
     * @notice Emitted when operations on src chain is done, the transfer is sent through the bridge
     * @param id see _computeId()
     * @param transferId the src transfer id produced by MessageSenderLib.sendMessageWithTransfer()
     * @param dstChainId destination chain id
     * @param srcAmount input amount approved by the sender
     * @param srcToken the input token approved by the sender
     * @param dstToken the final output token (after bridging and swapping) desired by the sender
     * @param bridgeOutReceiver the receiver (user or dst TransferSwapper) of the bridge token
     */
    event RequestSent(
        bytes32 id,
        bytes32 transferId,
        uint64 dstChainId,
        uint256 srcAmount,
        address srcToken,
        address dstToken,
        address bridgeOutReceiver
    );
    // emitted when operations on dst chain is done.
    // dstAmount is denominated by dstToken, refundAmount is denominated by bridge out token.
    // if refundAmount is a non-zero number, it means the "allow partial fill" option is turned on.

    /**
     * @notice Emitted when operations on dst chain is done.
     * @param id see _computeId()
     * @param dstAmount the final output token (after bridging and swapping) desired by the sender
     * @param refundAmount the amount refunded to the receiver in bridge token
     * @dev refundAmount may be fill by either a complete refund or when allowPartialFill is on and
     * some swaps fails in the swap routes
     * @param refundToken bridge out token
     * @param feeCollected the fee chainhop deducts from bridge out token
     * @param status see RequestStatus
     */
    event RequestDone(
        bytes32 id,
        uint256 dstAmount,
        uint256 refundAmount,
        address refundToken,
        uint256 feeCollected,
        RequestStatus status
    );

    /// @notice erc20 wrap of the gas token of this chain, e.g. WETH
    address public nativeWrap;

    /// @dev saves the sender addresses of direct bridge transfers so that when refund happens, this contract
    /// knows who to refund the tokens to
    mapping(bytes32 => address) public directBridgeSenders;

    constructor(
        address _messageBus,
        address _nativeWrap,
        address _signer,
        address _feeCollector,
        string[] memory _funcSigs,
        address[] memory _codecs,
        address[] memory _supportedDexList,
        string[] memory _supportedDexFuncs
    )
        Swapper(_funcSigs, _codecs, _supportedDexList, _supportedDexFuncs)
        FeeOperator(_feeCollector)
        SigVerifier(_signer)
    {
        messageBus = _messageBus;
        nativeWrap = _nativeWrap;
    }

    /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
     * Source chain functions
     * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

    /**
     * @notice swaps if needed, then transfer the token to another chain along with an instruction on how to swap
     * on that chain
     * @param _dstTransferSwapper the address of the receiving party of the bridge token (TransferSwapper) on the destination chain
     * @dev this field has no effect if the there is no dst swaps as the bridged tokens are sent directly to _desc.receiver
     */
    function transferWithSwap(
        address _dstTransferSwapper,
        TransferDescription calldata _desc,
        ICodec.SwapDescription[] calldata _srcSwaps,
        ICodec.SwapDescription[] calldata _dstSwaps
    ) external payable nonReentrant {
        // a request needs to incur a swap, a transfer, or both. otherwise it's a nop and we revert early to save gas
        require(_srcSwaps.length != 0 || _desc.dstChainId != uint64(block.chainid), "nop");
        require(_srcSwaps.length != 0 || (_desc.amountIn != 0 && _desc.tokenIn != address(0)), "nop");

        uint256 amountIn = _desc.amountIn;
        address tokenIn = _desc.tokenIn;
        address tokenOut = _desc.tokenIn;
        ICodec[] memory codecs;

        if (_srcSwaps.length != 0) {
            (amountIn, tokenIn, tokenOut, codecs) = sanitizeSwaps(_srcSwaps);
            require(tokenIn == _desc.tokenIn, "tkin mm");
        }
        if (_desc.nativeIn) {
            require(tokenIn == nativeWrap, "tkin no nativeWrap");
            require(msg.value >= amountIn, "insfcnt amt"); // insufficient amount
            IWETH(nativeWrap).deposit{value: amountIn}();
        } else {
            IERC20(tokenIn).safeTransferFrom(msg.sender, address(this), amountIn);
        }
        _swapAndSend(_dstTransferSwapper, amountIn, tokenIn, tokenOut, _srcSwaps, _dstSwaps, _desc, codecs);
    }

    function _swapAndSend(
        address _dstTransferSwapper,
        uint256 _amountIn,
        address _tokenIn,
        address _tokenOut,
        ICodec.SwapDescription[] memory _srcSwaps,
        ICodec.SwapDescription[] memory _dstSwaps,
        TransferDescription memory _desc,
        ICodec[] memory _codecs
    ) private {
        // swap if needed
        uint256 amountOut = _amountIn;
        if (_srcSwaps.length != 0) {
            bool ok;
            (ok, amountOut) = executeSwaps(_srcSwaps, _codecs);
            require(ok, "swap fail");
        }

        bytes32 id = _computeId(_desc.receiver, _desc.nonce);
        // direct send if needed
        if (_desc.dstChainId == uint64(block.chainid)) {
            emit DirectSwap(id, _amountIn, _tokenIn, amountOut, _tokenOut);
            _sendToken(_tokenOut, amountOut, _desc.receiver, _desc.nativeOut);
            return;
        }

        _verifyFee(_desc, _amountIn, _tokenIn);
        uint256 msgFee = msg.value;
        if (_desc.nativeIn) {
            msgFee = msg.value - _amountIn;
        }
        // transfer through bridge
        address bridgeOutReceiver = _dstSwaps.length > 0 ? _dstTransferSwapper : _desc.receiver;
        bytes32 transferId = _transfer(id, bridgeOutReceiver, _desc, _dstSwaps, amountOut, _tokenOut, msgFee);
        emit RequestSent(id, transferId, _desc.dstChainId, _amountIn, _tokenIn, _desc.dstTokenOut, bridgeOutReceiver);
    }

    function _transfer(
        bytes32 _id,
        address _bridgeOutReceiver,
        TransferDescription memory _desc,
        ICodec.SwapDescription[] memory _dstSwaps,
        uint256 _amount,
        address _token,
        uint256 _msgFee
    ) private returns (bytes32 transferId) {
        bytes memory requestMessage = _encodeRequestMessage(_id, _desc, _dstSwaps);
        transferId = MessageSenderLib.sendMessageWithTransfer(
            _bridgeOutReceiver,
            _token,
            _amount,
            _desc.dstChainId,
            _desc.nonce,
            _desc.maxBridgeSlippage,
            requestMessage,
            _desc.bridgeType,
            messageBus,
            _msgFee
        );
    }

    /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
     * Destination chain functions
     * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

    /**
     * @notice Executes a swap if needed, then sends the output token to the receiver
     * @dev If allowPartialFill is off, this function reverts as soon as one swap in swap routes fails
     * @dev This function is called and is only callable by MessageBus. The transaction of such call is triggered by executor.
     * @param _token the token received by this contract
     * @param _amount the amount of token received by this contract
     * @return ok whether the processing is successful
     */
    function executeMessageWithTransfer(
        address, // _sender
        address _token,
        uint256 _amount,
        uint64, // _srcChainId
        bytes memory _message,
        address // _executor
    ) external payable override onlyMessageBus nonReentrant returns (ExecutionStatus) {
        Request memory m = abi.decode((_message), (Request));

        // handle the case where amount received is not enough to pay fee
        if (_amount < m.fee) {
            m.fee = _amount;
            emit RequestDone(m.id, 0, 0, _token, m.fee, RequestStatus.Succeeded);
            return ExecutionStatus.Success;
        } else {
            _amount = _amount - m.fee;
        }

        address tokenOut = _token;
        bool nativeOut = m.nativeOut;
        uint256 sumAmtOut = _amount;
        uint256 sumAmtFailed;

        if (m.swaps.length != 0) {
            ICodec[] memory codecs;
            address tokenIn;
            // swap first before sending the token out to user
            (, tokenIn, tokenOut, codecs) = sanitizeSwaps(m.swaps);
            require(tokenIn == _token, "tkin mm"); // tokenIn mismatch
            (sumAmtOut, sumAmtFailed) = executeSwapsWithOverride(m.swaps, codecs, _amount, m.allowPartialFill);
            // if at this stage the tx is not reverted, it means at least 1 swap in routes succeeded
        }
        if (sumAmtFailed > 0) {
            _sendToken(_token, sumAmtFailed, m.receiver, false);
        }
        _sendToken(tokenOut, sumAmtOut, m.receiver, nativeOut);
        // status is always success as long as this function call doesn't revert. partial fill is also considered success
        emit RequestDone(m.id, sumAmtOut, sumAmtFailed, _token, m.fee, RequestStatus.Succeeded);
        return ExecutionStatus.Success;
    }

    /**
     * @notice Sends the received token to the receiver
     * @dev Only called if executeMessageWithTransfer reverts
     * @param _token the token received by this contract
     * @param _amount the amount of token received by this contract
     * @return ok whether the processing is successful
     */
    function executeMessageWithTransferFallback(
        address, // _sender
        address _token,
        uint256 _amount,
        uint64, // _srcChainId
        bytes memory _message,
        address // _executor
    ) external payable override onlyMessageBus nonReentrant returns (ExecutionStatus) {
        Request memory m = abi.decode((_message), (Request));

        uint256 refundAmount = _amount - m.fee; // no need to check amount >= fee as it's already checked before
        _sendToken(_token, refundAmount, m.receiver, false);

        emit RequestDone(m.id, 0, refundAmount, _token, m.fee, RequestStatus.Fallback);
        return ExecutionStatus.Success;
    }

    /**
     * @notice Used to trigger refund when bridging fails due to large slippage
     * @dev only MessageBus can call this function, this requires the user to get sigs of the message from SGN
     * @param _token the token received by this contract
     * @param _amount the amount of token received by this contract
     * @return ok whether the processing is successful
     */
    function executeMessageWithTransferRefund(
        address _token,
        uint256 _amount,
        bytes calldata _message,
        address // _executor
    ) external payable override onlyMessageBus nonReentrant returns (ExecutionStatus) {
        Request memory m = abi.decode((_message), (Request));
        _sendToken(_token, _amount, m.receiver, false);
        emit RequestDone(m.id, 0, _amount, _token, m.fee, RequestStatus.Fallback);
        return ExecutionStatus.Success;
    }

    /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
     * Misc
     * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
    function _computeId(address _receiver, uint64 _nonce) private view returns (bytes32) {
        return keccak256(abi.encodePacked(msg.sender, _receiver, uint64(block.chainid), _nonce));
    }

    function _sendToken(
        address _token,
        uint256 _amount,
        address _receiver,
        bool _nativeOut
    ) private {
        if (_nativeOut) {
            require(_token == nativeWrap, "tk no native");
            IWETH(nativeWrap).withdraw(_amount);
            (bool sent, ) = _receiver.call{value: _amount, gas: 50000}("");
            require(sent, "send fail");
        } else {
            IERC20(_token).safeTransfer(_receiver, _amount);
        }
    }

    function _encodeRequestMessage(
        bytes32 _id,
        TransferDescription memory _desc,
        ICodec.SwapDescription[] memory _swaps
    ) private pure returns (bytes memory message) {
        message = abi.encode(
            Request({
                id: _id,
                swaps: _swaps,
                receiver: _desc.receiver,
                nativeOut: _desc.nativeOut,
                fee: _desc.fee,
                allowPartialFill: _desc.allowPartialFill
            })
        );
    }

    function _verifyFee(
        TransferDescription memory _desc,
        uint256 _amountIn,
        address _tokenIn
    ) private view {
        bytes32 hash = keccak256(
            abi.encodePacked(
                "executor fee",
                uint64(block.chainid),
                _desc.dstChainId,
                _amountIn,
                _tokenIn,
                _desc.feeDeadline,
                _desc.fee
            )
        );
        bytes32 signHash = hash.toEthSignedMessageHash();
        verifySig(signHash, _desc.feeSig);
        require(_desc.feeDeadline > block.timestamp, "deadline exceeded");
    }

    function setNativeWrap(address _nativeWrap) external onlyOwner {
        nativeWrap = _nativeWrap;
        emit NativeWrapUpdated(_nativeWrap);
    }

    // This is needed to receive ETH when calling `IWETH.withdraw`
    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

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

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

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

    /**
     * @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
// OpenZeppelin Contracts (last updated v4.5.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^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() {
        _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 making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

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

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity 0.8.12;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "../interfaces/IBridge.sol";
import "../interfaces/IOriginalTokenVault.sol";
import "../interfaces/IOriginalTokenVaultV2.sol";
import "../interfaces/IPeggedTokenBridge.sol";
import "../interfaces/IPeggedTokenBridgeV2.sol";
import "../interfaces/IMessageBus.sol";
import "./MsgDataTypes.sol";

library MessageSenderLib {
    using SafeERC20 for IERC20;

    // ============== Internal library functions called by apps ==============

    /**
     * @notice Sends a message to an app on another chain via MessageBus without an associated transfer.
     * @param _receiver The address of the destination app contract.
     * @param _dstChainId The destination chain ID.
     * @param _message Arbitrary message bytes to be decoded by the destination app contract.
     * @param _messageBus The address of the MessageBus on this chain.
     * @param _fee The fee amount to pay to MessageBus.
     */
    function sendMessage(
        address _receiver,
        uint64 _dstChainId,
        bytes memory _message,
        address _messageBus,
        uint256 _fee
    ) internal {
        IMessageBus(_messageBus).sendMessage{value: _fee}(_receiver, _dstChainId, _message);
    }

    /**
     * @notice Sends a message to an app on another chain via MessageBus with an associated transfer.
     * @param _receiver The address of the destination app contract.
     * @param _token The address of the token to be sent.
     * @param _amount The amount of tokens to be sent.
     * @param _dstChainId The destination chain ID.
     * @param _nonce A number input to guarantee uniqueness of transferId. Can be timestamp in practice.
     * @param _maxSlippage The max slippage accepted, given as percentage in point (pip). Eg. 5000 means 0.5%.
     * Must be greater than minimalMaxSlippage. Receiver is guaranteed to receive at least (100% - max slippage percentage) * amount or the
     * transfer can be refunded. Only applicable to the {MsgDataTypes.BridgeSendType.Liquidity}.
     * @param _message Arbitrary message bytes to be decoded by the destination app contract.
     * @param _bridgeSendType One of the {MsgDataTypes.BridgeSendType} enum.
     * @param _messageBus The address of the MessageBus on this chain.
     * @param _fee The fee amount to pay to MessageBus.
     * @return The transfer ID.
     */
    function sendMessageWithTransfer(
        address _receiver,
        address _token,
        uint256 _amount,
        uint64 _dstChainId,
        uint64 _nonce,
        uint32 _maxSlippage,
        bytes memory _message,
        MsgDataTypes.BridgeSendType _bridgeSendType,
        address _messageBus,
        uint256 _fee
    ) internal returns (bytes32) {
        (bytes32 transferId, address bridge) = sendTokenTransfer(
            _receiver,
            _token,
            _amount,
            _dstChainId,
            _nonce,
            _maxSlippage,
            _bridgeSendType,
            _messageBus
        );
        if (_message.length > 0) {
            IMessageBus(_messageBus).sendMessageWithTransfer{value: _fee}(
                _receiver,
                _dstChainId,
                bridge,
                transferId,
                _message
            );
        }
        return transferId;
    }

    /**
     * @notice Sends a token transfer via a bridge.
     * @param _receiver The address of the destination app contract.
     * @param _token The address of the token to be sent.
     * @param _amount The amount of tokens to be sent.
     * @param _dstChainId The destination chain ID.
     * @param _nonce A number input to guarantee uniqueness of transferId. Can be timestamp in practice.
     * @param _maxSlippage The max slippage accepted, given as percentage in point (pip). Eg. 5000 means 0.5%.
     * Must be greater than minimalMaxSlippage. Receiver is guaranteed to receive at least (100% - max slippage percentage) * amount or the
     * transfer can be refunded.
     * @param _bridgeSendType One of the {MsgDataTypes.BridgeSendType} enum.
     */
    function sendTokenTransfer(
        address _receiver,
        address _token,
        uint256 _amount,
        uint64 _dstChainId,
        uint64 _nonce,
        uint32 _maxSlippage,
        MsgDataTypes.BridgeSendType _bridgeSendType,
        address _messageBus
    ) internal returns (bytes32 transferId, address bridge) {
        if (_bridgeSendType == MsgDataTypes.BridgeSendType.Liquidity) {
            bridge = IMessageBus(_messageBus).liquidityBridge();
            IERC20(_token).safeIncreaseAllowance(bridge, _amount);
            IBridge(bridge).send(_receiver, _token, _amount, _dstChainId, _nonce, _maxSlippage);
            transferId = computeLiqBridgeTransferId(_receiver, _token, _amount, _dstChainId, _nonce);
        } else if (_bridgeSendType == MsgDataTypes.BridgeSendType.PegDeposit) {
            bridge = IMessageBus(_messageBus).pegVault();
            IERC20(_token).safeIncreaseAllowance(bridge, _amount);
            IOriginalTokenVault(bridge).deposit(_token, _amount, _dstChainId, _receiver, _nonce);
            transferId = computePegV1DepositId(_receiver, _token, _amount, _dstChainId, _nonce);
        } else if (_bridgeSendType == MsgDataTypes.BridgeSendType.PegBurn) {
            bridge = IMessageBus(_messageBus).pegBridge();
            IERC20(_token).safeIncreaseAllowance(bridge, _amount);
            IPeggedTokenBridge(bridge).burn(_token, _amount, _receiver, _nonce);
            // handle cases where certain tokens do not spend allowance for role-based burn
            IERC20(_token).safeApprove(bridge, 0);
            transferId = computePegV1BurnId(_receiver, _token, _amount, _nonce);
        } else if (_bridgeSendType == MsgDataTypes.BridgeSendType.PegV2Deposit) {
            bridge = IMessageBus(_messageBus).pegVaultV2();
            IERC20(_token).safeIncreaseAllowance(bridge, _amount);
            transferId = IOriginalTokenVaultV2(bridge).deposit(_token, _amount, _dstChainId, _receiver, _nonce);
        } else if (_bridgeSendType == MsgDataTypes.BridgeSendType.PegV2Burn) {
            bridge = IMessageBus(_messageBus).pegBridgeV2();
            IERC20(_token).safeIncreaseAllowance(bridge, _amount);
            transferId = IPeggedTokenBridgeV2(bridge).burn(_token, _amount, _dstChainId, _receiver, _nonce);
            // handle cases where certain tokens do not spend allowance for role-based burn
            IERC20(_token).safeApprove(bridge, 0);
        } else if (_bridgeSendType == MsgDataTypes.BridgeSendType.PegV2BurnFrom) {
            bridge = IMessageBus(_messageBus).pegBridgeV2();
            IERC20(_token).safeIncreaseAllowance(bridge, _amount);
            transferId = IPeggedTokenBridgeV2(bridge).burnFrom(_token, _amount, _dstChainId, _receiver, _nonce);
            // handle cases where certain tokens do not spend allowance for role-based burn
            IERC20(_token).safeApprove(bridge, 0);
        } else {
            revert("bridge type not supported");
        }
    }

    function computeLiqBridgeTransferId(
        address _receiver,
        address _token,
        uint256 _amount,
        uint64 _dstChainId,
        uint64 _nonce
    ) internal view returns (bytes32) {
        return
            keccak256(
                abi.encodePacked(address(this), _receiver, _token, _amount, _dstChainId, _nonce, uint64(block.chainid))
            );
    }

    function computePegV1DepositId(
        address _receiver,
        address _token,
        uint256 _amount,
        uint64 _dstChainId,
        uint64 _nonce
    ) internal view returns (bytes32) {
        return
            keccak256(
                abi.encodePacked(address(this), _token, _amount, _dstChainId, _receiver, _nonce, uint64(block.chainid))
            );
    }

    function computePegV1BurnId(
        address _receiver,
        address _token,
        uint256 _amount,
        uint64 _nonce
    ) internal view returns (bytes32) {
        return keccak256(abi.encodePacked(address(this), _token, _amount, _receiver, _nonce, uint64(block.chainid)));
    }
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity 0.8.12;

import "../interfaces/IMessageReceiverApp.sol";
import "./MessageBusAddress.sol";

abstract contract MessageReceiverApp is IMessageReceiverApp, MessageBusAddress {
    modifier onlyMessageBus() {
        require(msg.sender == messageBus, "caller is not message bus");
        _;
    }

    /**
     * @notice Called by MessageBus (MessageBusReceiver) if the process is originated from MessageBus (MessageBusSender)'s
     *         sendMessageWithTransfer it is only called when the tokens are checked to be arrived at this contract's address.
     * @param _sender The address of the source app contract
     * @param _token The address of the token that comes out of the bridge
     * @param _amount The amount of tokens received at this contract through the cross-chain bridge.
     *        the contract that implements this contract can safely assume that the tokens will arrive before this
     *        function is called.
     * @param _srcChainId The source chain ID where the transfer is originated from
     * @param _message Arbitrary message bytes originated from and encoded by the source app contract
     * @param _executor Address who called the MessageBus execution function
     */
    function executeMessageWithTransfer(
        address _sender,
        address _token,
        uint256 _amount,
        uint64 _srcChainId,
        bytes calldata _message,
        address _executor
    ) external payable virtual override onlyMessageBus returns (ExecutionStatus) {}

    /**
     * @notice Only called by MessageBus (MessageBusReceiver) if
     *         1. executeMessageWithTransfer reverts, or
     *         2. executeMessageWithTransfer returns ExecutionStatus.Fail
     * @param _sender The address of the source app contract
     * @param _token The address of the token that comes out of the bridge
     * @param _amount The amount of tokens received at this contract through the cross-chain bridge.
     *        the contract that implements this contract can safely assume that the tokens will arrive before this
     *        function is called.
     * @param _srcChainId The source chain ID where the transfer is originated from
     * @param _message Arbitrary message bytes originated from and encoded by the source app contract
     * @param _executor Address who called the MessageBus execution function
     */
    function executeMessageWithTransferFallback(
        address _sender,
        address _token,
        uint256 _amount,
        uint64 _srcChainId,
        bytes calldata _message,
        address _executor
    ) external payable virtual override onlyMessageBus returns (ExecutionStatus) {}

    /**
     * @notice Called by MessageBus (MessageBusReceiver) to process refund of the original transfer from this contract
     * @param _token The token address of the original transfer
     * @param _amount The amount of the original transfer
     * @param _message The same message associated with the original transfer
     * @param _executor Address who called the MessageBus execution function
     */
    function executeMessageWithTransferRefund(
        address _token,
        uint256 _amount,
        bytes calldata _message,
        address _executor
    ) external payable virtual override onlyMessageBus returns (ExecutionStatus) {}

    /**
     * @notice Called by MessageBus (MessageBusReceiver)
     * @param _sender The address of the source app contract
     * @param _srcChainId The source chain ID where the transfer is originated from
     * @param _message Arbitrary message bytes originated from and encoded by the source app contract
     * @param _executor Address who called the MessageBus execution function
     */
    function executeMessage(
        address _sender,
        uint64 _srcChainId,
        bytes calldata _message,
        address _executor
    ) external payable virtual override onlyMessageBus returns (ExecutionStatus) {}
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity 0.8.12;

library MsgDataTypes {
    // bridge operation type at the sender side (src chain)
    enum BridgeSendType {
        Null,
        Liquidity,
        PegDeposit,
        PegBurn,
        PegV2Deposit,
        PegV2Burn,
        PegV2BurnFrom
    }

    // bridge operation type at the receiver side (dst chain)
    enum TransferType {
        Null,
        LqRelay, // relay through liquidity bridge
        LqWithdraw, // withdraw from liquidity bridge
        PegMint, // mint through pegged token bridge
        PegWithdraw, // withdraw from original token vault
        PegV2Mint, // mint through pegged token bridge v2
        PegV2Withdraw // withdraw from original token vault v2
    }

    enum MsgType {
        MessageWithTransfer,
        MessageOnly
    }

    enum TxStatus {
        Null,
        Success,
        Fail,
        Fallback,
        Pending // transient state within a transaction
    }

    struct TransferInfo {
        TransferType t;
        address sender;
        address receiver;
        address token;
        uint256 amount;
        uint64 wdseq; // only needed for LqWithdraw (refund)
        uint64 srcChainId;
        bytes32 refId;
        bytes32 srcTxHash; // src chain msg tx hash
    }

    struct RouteInfo {
        address sender;
        address receiver;
        uint64 srcChainId;
        bytes32 srcTxHash; // src chain msg tx hash
    }

    struct MsgWithTransferExecutionParams {
        bytes message;
        TransferInfo transfer;
        bytes[] sigs;
        address[] signers;
        uint256[] powers;
    }

    struct BridgeTransferParams {
        bytes request;
        bytes[] sigs;
        address[] signers;
        uint256[] powers;
    }
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.12;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/**
 * @title Allows the owner to set fee collector and allows fee collectors to collect fees
 * @author Padoriku
 */
abstract contract FeeOperator is Ownable {
    using SafeERC20 for IERC20;

    address public feeCollector;

    event FeeCollectorUpdated(address from, address to);

    modifier onlyFeeCollector() {
        require(msg.sender == feeCollector, "not fee collector");
        _;
    }

    constructor(address _feeCollector) {
        feeCollector = _feeCollector;
    }

    function collectFee(address[] calldata _tokens, address _to) external onlyFeeCollector {
        for (uint256 i = 0; i < _tokens.length; i++) {
            uint256 balance = IERC20(_tokens[i]).balanceOf(address(this));
            IERC20(_tokens[i]).safeTransfer(_to, balance);
        }
    }

    function setFeeCollector(address _feeCollector) external onlyOwner {
        address oldFeeCollector = feeCollector;
        feeCollector = _feeCollector;
        emit FeeCollectorUpdated(oldFeeCollector, _feeCollector);
    }
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.12;

import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/**
 * @title Allows owner to set signer, and verifies signatures
 * @author Padoriku
 */
contract SigVerifier is Ownable {
    using ECDSA for bytes32;

    address public signer;

    event SignerUpdated(address from, address to);

    constructor(address _signer) {
        signer = _signer;
    }

    function setSigner(address _signer) public onlyOwner {
        address oldSigner = signer;
        signer = _signer;
        emit SignerUpdated(oldSigner, _signer);
    }

    function verifySig(bytes32 _hash, bytes memory _feeSig) internal view {
        address _signer = _hash.recover(_feeSig);
        require(_signer == signer, "invalid signer");
    }
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.12;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./CodecRegistry.sol";
import "./interfaces/ICodec.sol";
import "./interfaces/IWETH.sol";
import "./DexRegistry.sol";

/**
 * @title Loads codecs for the swaps and performs swap actions
 * @author Padoriku
 */
contract Swapper is CodecRegistry, DexRegistry {
    using SafeERC20 for IERC20;

    constructor(
        string[] memory _funcSigs,
        address[] memory _codecs,
        address[] memory _supportedDexList,
        string[] memory _supportedDexFuncs
    ) DexRegistry(_supportedDexList, _supportedDexFuncs) CodecRegistry(_funcSigs, _codecs) {}

    /**
     * @dev Checks the input swaps for that tokenIn and tokenOut for every swap should be the same
     * @param _swaps the swaps the check
     * @return sumAmtIn the sum of all amountIns in the swaps
     * @return tokenIn the input token of the swaps
     * @return tokenOut the desired output token of the swaps
     * @return codecs a list of codecs which each of them corresponds to a swap
     */
    function sanitizeSwaps(ICodec.SwapDescription[] memory _swaps)
        internal
        view
        returns (
            uint256 sumAmtIn,
            address tokenIn,
            address tokenOut,
            ICodec[] memory codecs // _codecs[i] is for _swaps[i]
        )
    {
        address prevTokenIn;
        address prevTokenOut;
        codecs = loadCodecs(_swaps);

        for (uint256 i = 0; i < _swaps.length; i++) {
            require(dexRegistry[_swaps[i].dex][bytes4(_swaps[i].data)], "unsupported dex");
            (uint256 _amountIn, address _tokenIn, address _tokenOut) = codecs[i].decodeCalldata(_swaps[i]);
            require(prevTokenIn == address(0) || prevTokenIn == _tokenIn, "tkin mismatch");
            prevTokenIn = _tokenIn;
            require(prevTokenOut == address(0) || prevTokenOut == _tokenOut, "tko mismatch");
            prevTokenOut = _tokenOut;

            sumAmtIn += _amountIn;
            tokenIn = _tokenIn;
            tokenOut = _tokenOut;
        }
    }

    /**
     * @notice Executes the swaps, decode their return values and sums the returned amount
     * @dev This function is intended to be used on src chain only
     * @dev This function immediately fails (return false) if any swaps fail. There is no "partial fill" on src chain
     * @param _swaps swaps. this function assumes that the swaps are already sanitized
     * @param _codecs the codecs for each swap
     * @return ok whether the operation is successful
     * @return sumAmtOut the sum of all amounts gained from swapping
     */
    function executeSwaps(
        ICodec.SwapDescription[] memory _swaps,
        ICodec[] memory _codecs // _codecs[i] is for _swaps[i]
    ) internal returns (bool ok, uint256 sumAmtOut) {
        for (uint256 i = 0; i < _swaps.length; i++) {
            (uint256 amountIn, address tokenIn, address tokenOut) = _codecs[i].decodeCalldata(_swaps[i]);
            bytes memory data = _codecs[i].encodeCalldataWithOverride(_swaps[i].data, amountIn, address(this));
            IERC20(tokenIn).safeIncreaseAllowance(_swaps[i].dex, amountIn);
            uint256 balBefore = IERC20(tokenOut).balanceOf(address(this));
            (ok, ) = _swaps[i].dex.call(data);
            if (!ok) {
                return (false, 0);
            }
            uint256 balAfter = IERC20(tokenOut).balanceOf(address(this));
            sumAmtOut += balAfter - balBefore;
        }
    }

    /**
     * @notice Executes the swaps with override, redistributes amountIns for each swap route,
     * decode their return values and sums the returned amount
     * @dev This function is intended to be used on dst chain only
     * @param _swaps swaps to execute. this function assumes that the swaps are already sanitized
     * @param _codecs the codecs for each swap
     * @param _amountInOverride the amountIn to substitute the amountIns in swaps for
     * @dev _amountInOverride serves the purpose of correcting the estimated amountIns to actual bridge outs
     * @dev _amountInOverride is also distributed according to the weight of each original amountIn
     * @return sumAmtOut the sum of all amounts gained from swapping
     * @return sumAmtFailed the sum of all amounts that fails to swap
     */
    function executeSwapsWithOverride(
        ICodec.SwapDescription[] memory _swaps,
        ICodec[] memory _codecs, // _codecs[i] is for _swaps[i]
        uint256 _amountInOverride,
        bool _allowPartialFill
    ) internal returns (uint256 sumAmtOut, uint256 sumAmtFailed) {
        (uint256[] memory amountIns, address tokenIn, address tokenOut) = _redistributeAmountIn(
            _swaps,
            _amountInOverride,
            _codecs
        );
        uint256 balBefore = IERC20(tokenOut).balanceOf(address(this));
        // execute the swaps with adjusted amountIns
        for (uint256 i = 0; i < _swaps.length; i++) {
            bytes memory swapCalldata = _codecs[i].encodeCalldataWithOverride(
                _swaps[i].data,
                amountIns[i],
                address(this)
            );
            IERC20(tokenIn).safeIncreaseAllowance(_swaps[i].dex, amountIns[i]);
            (bool ok, ) = _swaps[i].dex.call(swapCalldata);
            require(ok || _allowPartialFill, "swap failed");
            if (!ok) {
                sumAmtFailed += amountIns[i];
            }
        }
        uint256 balAfter = IERC20(tokenOut).balanceOf(address(this));
        sumAmtOut = balAfter - balBefore;
        require(sumAmtOut > 0, "all swaps failed");
    }

    /// @notice distributes the _amountInOverride to the swaps base on how much each original amountIns weight
    function _redistributeAmountIn(
        ICodec.SwapDescription[] memory _swaps,
        uint256 _amountInOverride,
        ICodec[] memory _codecs
    )
        private
        view
        returns (
            uint256[] memory amountIns,
            address tokenIn,
            address tokenOut
        )
    {
        uint256 sumAmtIn;
        amountIns = new uint256[](_swaps.length);

        // compute sumAmtIn and collect amountIns
        for (uint256 i = 0; i < _swaps.length; i++) {
            uint256 amountIn;
            (amountIn, tokenIn, tokenOut) = _codecs[i].decodeCalldata(_swaps[i]);
            sumAmtIn += amountIn;
            amountIns[i] = amountIn;
        }

        // compute adjusted amountIns with regard to the weight of each amountIns in total amountIn
        for (uint256 i = 0; i < amountIns.length; i++) {
            amountIns[i] = (_amountInOverride * amountIns[i]) / sumAmtIn;
        }
    }
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.0;

interface ICodec {
    struct SwapDescription {
        address dex; // the DEX to use for the swap, zero address implies no swap needed
        bytes data; // the data to call the dex with
    }

    function decodeCalldata(SwapDescription calldata swap)
        external
        view
        returns (
            uint256 amountIn,
            address tokenIn,
            address tokenOut
        );

    function encodeCalldataWithOverride(
        bytes calldata data,
        uint256 amountInOverride,
        address receiverOverride
    ) external pure returns (bytes memory swapCalldata);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

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

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

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

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.0;

interface IBridge {
    function send(
        address _receiver,
        address _token,
        uint256 _amount,
        uint64 _dstChainId,
        uint64 _nonce,
        uint32 _maxSlippage
    ) external;

    function relay(
        bytes calldata _relayRequest,
        bytes[] calldata _sigs,
        address[] calldata _signers,
        uint256[] calldata _powers
    ) external;

    function transfers(bytes32 transferId) external view returns (bool);

    function withdraws(bytes32 withdrawId) external view returns (bool);

    function withdraw(
        bytes calldata _wdmsg,
        bytes[] calldata _sigs,
        address[] calldata _signers,
        uint256[] calldata _powers
    ) external;

    /**
     * @notice Verifies that a message is signed by a quorum among the signers.
     * @param _msg signed message
     * @param _sigs list of signatures sorted by signer addresses in ascending order
     * @param _signers sorted list of current signers
     * @param _powers powers of current signers
     */
    function verifySigs(
        bytes memory _msg,
        bytes[] calldata _sigs,
        address[] calldata _signers,
        uint256[] calldata _powers
    ) external view;
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.0;

interface IOriginalTokenVault {
    /**
     * @notice Lock original tokens to trigger mint at a remote chain's PeggedTokenBridge
     * @param _token local token address
     * @param _amount locked token amount
     * @param _mintChainId destination chainId to mint tokens
     * @param _mintAccount destination account to receive minted tokens
     * @param _nonce user input to guarantee unique depositId
     */
    function deposit(
        address _token,
        uint256 _amount,
        uint64 _mintChainId,
        address _mintAccount,
        uint64 _nonce
    ) external;

    function records(bytes32 recordId) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.0;

interface IOriginalTokenVaultV2 {
    /**
     * @notice Lock original tokens to trigger mint at a remote chain's PeggedTokenBridge
     * @param _token local token address
     * @param _amount locked token amount
     * @param _mintChainId destination chainId to mint tokens
     * @param _mintAccount destination account to receive minted tokens
     * @param _nonce user input to guarantee unique depositId
     */
    function deposit(
        address _token,
        uint256 _amount,
        uint64 _mintChainId,
        address _mintAccount,
        uint64 _nonce
    ) external returns (bytes32);

    function records(bytes32 recordId) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.0;

interface IPeggedTokenBridge {
    /**
     * @notice Burn tokens to trigger withdrawal at a remote chain's OriginalTokenVault
     * @param _token local token address
     * @param _amount locked token amount
     * @param _withdrawAccount account who withdraw original tokens on the remote chain
     * @param _nonce user input to guarantee unique depositId
     */
    function burn(
        address _token,
        uint256 _amount,
        address _withdrawAccount,
        uint64 _nonce
    ) external;

    function records(bytes32 recordId) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.0;

interface IPeggedTokenBridgeV2 {
    /**
     * @notice Burn pegged tokens to trigger a cross-chain withdrawal of the original tokens at a remote chain's
     * OriginalTokenVault, or mint at another remote chain
     * @param _token The pegged token address.
     * @param _amount The amount to burn.
     * @param _toChainId If zero, withdraw from original vault; otherwise, the remote chain to mint tokens.
     * @param _toAccount The account to receive tokens on the remote chain
     * @param _nonce A number to guarantee unique depositId. Can be timestamp in practice.
     */
    function burn(
        address _token,
        uint256 _amount,
        uint64 _toChainId,
        address _toAccount,
        uint64 _nonce
    ) external returns (bytes32);

    // same with `burn` above, use openzeppelin ERC20Burnable interface
    function burnFrom(
        address _token,
        uint256 _amount,
        uint64 _toChainId,
        address _toAccount,
        uint64 _nonce
    ) external returns (bytes32);

    /**
     * @notice Mint tokens triggered by deposit at a remote chain's OriginalTokenVault.
     * @param _request The serialized Mint protobuf.
     * @param _sigs The list of signatures sorted by signing addresses in ascending order. A relay must be signed-off by
     * +2/3 of the sigsVerifier's current signing power to be delivered.
     * @param _signers The sorted list of signers.
     * @param _powers The signing powers of the signers.
     */
    function mint(
        bytes calldata _request,
        bytes[] calldata _sigs,
        address[] calldata _signers,
        uint256[] calldata _powers
    ) external returns (bytes32);

    function records(bytes32 recordId) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.0;

import "../lib/MsgDataTypes.sol";

interface IMessageBus {
    function liquidityBridge() external view returns (address);

    function pegBridge() external view returns (address);

    function pegBridgeV2() external view returns (address);

    function pegVault() external view returns (address);

    function pegVaultV2() external view returns (address);

    /**
     * @notice Calculates the required fee for the message.
     * @param _message Arbitrary message bytes to be decoded by the destination app contract.
     @ @return The required fee.
     */
    function calcFee(bytes calldata _message) external view returns (uint256);

    /**
     * @notice Sends a message to an app on another chain via MessageBus without an associated transfer.
     * A fee is charged in the native gas token.
     * @param _receiver The address of the destination app contract.
     * @param _dstChainId The destination chain ID.
     * @param _message Arbitrary message bytes to be decoded by the destination app contract.
     */
    function sendMessage(
        address _receiver,
        uint256 _dstChainId,
        bytes calldata _message
    ) external payable;

    /**
     * @notice Sends a message associated with a transfer to an app on another chain via MessageBus without an associated transfer.
     * A fee is charged in the native token.
     * @param _receiver The address of the destination app contract.
     * @param _dstChainId The destination chain ID.
     * @param _srcBridge The bridge contract to send the transfer with.
     * @param _srcTransferId The transfer ID.
     * @param _dstChainId The destination chain ID.
     * @param _message Arbitrary message bytes to be decoded by the destination app contract.
     */
    function sendMessageWithTransfer(
        address _receiver,
        uint256 _dstChainId,
        address _srcBridge,
        bytes32 _srcTransferId,
        bytes calldata _message
    ) external payable;

    /**
     * @notice Withdraws message fee in the form of native gas token.
     * @param _account The address receiving the fee.
     * @param _cumulativeFee The cumulative fee credited to the account. Tracked by SGN.
     * @param _sigs The list of signatures sorted by signing addresses in ascending order. A withdrawal must be
     * signed-off by +2/3 of the sigsVerifier's current signing power to be delivered.
     * @param _signers The sorted list of signers.
     * @param _powers The signing powers of the signers.
     */
    function withdrawFee(
        address _account,
        uint256 _cumulativeFee,
        bytes[] calldata _sigs,
        address[] calldata _signers,
        uint256[] calldata _powers
    ) external;

    /**
     * @notice Execute a message with a successful transfer.
     * @param _message Arbitrary message bytes originated from and encoded by the source app contract
     * @param _transfer The transfer info.
     * @param _sigs The list of signatures sorted by signing addresses in ascending order. A relay must be signed-off by
     * +2/3 of the sigsVerifier's current signing power to be delivered.
     * @param _signers The sorted list of signers.
     * @param _powers The signing powers of the signers.
     */
    function executeMessageWithTransfer(
        bytes calldata _message,
        MsgDataTypes.TransferInfo calldata _transfer,
        bytes[] calldata _sigs,
        address[] calldata _signers,
        uint256[] calldata _powers
    ) external payable;

    /**
     * @notice Execute a message with a refunded transfer.
     * @param _message Arbitrary message bytes originated from and encoded by the source app contract
     * @param _transfer The transfer info.
     * @param _sigs The list of signatures sorted by signing addresses in ascending order. A relay must be signed-off by
     * +2/3 of the sigsVerifier's current signing power to be delivered.
     * @param _signers The sorted list of signers.
     * @param _powers The signing powers of the signers.
     */
    function executeMessageWithTransferRefund(
        bytes calldata _message, // the same message associated with the original transfer
        MsgDataTypes.TransferInfo calldata _transfer,
        bytes[] calldata _sigs,
        address[] calldata _signers,
        uint256[] calldata _powers
    ) external payable;

    /**
     * @notice Execute a message not associated with a transfer.
     * @param _message Arbitrary message bytes originated from and encoded by the source app contract
     * @param _sigs The list of signatures sorted by signing addresses in ascending order. A relay must be signed-off by
     * +2/3 of the sigsVerifier's current signing power to be delivered.
     * @param _signers The sorted list of signers.
     * @param _powers The signing powers of the signers.
     */
    function executeMessage(
        bytes calldata _message,
        MsgDataTypes.RouteInfo calldata _route,
        bytes[] calldata _sigs,
        address[] calldata _signers,
        uint256[] calldata _powers
    ) external payable;
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.0;

interface IMessageReceiverApp {
    enum ExecutionStatus {
        Fail, // execution failed, finalized
        Success, // execution succeeded, finalized
        Retry // execution rejected, can retry later
    }

    /**
     * @notice Called by MessageBus (MessageBusReceiver) if the process is originated from MessageBus (MessageBusSender)'s
     *         sendMessageWithTransfer it is only called when the tokens are checked to be arrived at this contract's address.
     * @param _sender The address of the source app contract
     * @param _token The address of the token that comes out of the bridge
     * @param _amount The amount of tokens received at this contract through the cross-chain bridge.
     *        the contract that implements this contract can safely assume that the tokens will arrive before this
     *        function is called.
     * @param _srcChainId The source chain ID where the transfer is originated from
     * @param _message Arbitrary message bytes originated from and encoded by the source app contract
     * @param _executor Address who called the MessageBus execution function
     */
    function executeMessageWithTransfer(
        address _sender,
        address _token,
        uint256 _amount,
        uint64 _srcChainId,
        bytes calldata _message,
        address _executor
    ) external payable returns (ExecutionStatus);

    /**
     * @notice Only called by MessageBus (MessageBusReceiver) if
     *         1. executeMessageWithTransfer reverts, or
     *         2. executeMessageWithTransfer returns ExecutionStatus.Fail
     * @param _sender The address of the source app contract
     * @param _token The address of the token that comes out of the bridge
     * @param _amount The amount of tokens received at this contract through the cross-chain bridge.
     *        the contract that implements this contract can safely assume that the tokens will arrive before this
     *        function is called.
     * @param _srcChainId The source chain ID where the transfer is originated from
     * @param _message Arbitrary message bytes originated from and encoded by the source app contract
     * @param _executor Address who called the MessageBus execution function
     */
    function executeMessageWithTransferFallback(
        address _sender,
        address _token,
        uint256 _amount,
        uint64 _srcChainId,
        bytes calldata _message,
        address _executor
    ) external payable returns (ExecutionStatus);

    /**
     * @notice Called by MessageBus (MessageBusReceiver) to process refund of the original transfer from this contract
     * @param _token The token address of the original transfer
     * @param _amount The amount of the original transfer
     * @param _message The same message associated with the original transfer
     * @param _executor Address who called the MessageBus execution function
     */
    function executeMessageWithTransferRefund(
        address _token,
        uint256 _amount,
        bytes calldata _message,
        address _executor
    ) external payable returns (ExecutionStatus);

    /**
     * @notice Called by MessageBus (MessageBusReceiver)
     * @param _sender The address of the source app contract
     * @param _srcChainId The source chain ID where the transfer is originated from
     * @param _message Arbitrary message bytes originated from and encoded by the source app contract
     * @param _executor Address who called the MessageBus execution function
     */
    function executeMessage(
        address _sender,
        uint64 _srcChainId,
        bytes calldata _message,
        address _executor
    ) external payable returns (ExecutionStatus);
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity 0.8.12;

import "@openzeppelin/contracts/access/Ownable.sol";

abstract contract MessageBusAddress is Ownable {
    event MessageBusUpdated(address messageBus);

    address public messageBus;

    function setMessageBus(address _messageBus) public onlyOwner {
        messageBus = _messageBus;
        emit MessageBusUpdated(messageBus);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.12;

import "@openzeppelin/contracts/access/Ownable.sol";
import "./interfaces/ICodec.sol";

/**
 * @title A codec registry that maps swap function selectors to corresponding codec addresses
 * @author Padoriku
 */
abstract contract CodecRegistry is Ownable {
    // Initially supported swap functions
    // 0x3df02124 exchange(int128,int128,uint256,uint256)
    // 0xa6417ed6 exchange_underlying(int128,int128,uint256,uint256)
    // 0x44ee1986 exchange_underlying(int128,int128,uint256,uint256,address)
    // 0x38ed1739 swapExactTokensForTokens(uint256,uint256,address[],address,uint256)
    // 0xc04b8d59 exactInput((bytes,address,uint256,uint256,uint256))
    mapping(bytes4 => ICodec) public selector2codec;

    // not used programmatically, but added for contract transparency
    address[] public codecs;

    event CodecUpdated(bytes4 selector, address codec);

    constructor(string[] memory _funcSigs, address[] memory _codecs) {
        require(_funcSigs.length == _codecs.length, "len mm");
        for (uint256 i = 0; i < _funcSigs.length; i++) {
            bytes4 selector = bytes4(keccak256(bytes(_funcSigs[i])));
            _setCodec(selector, _codecs[i]);
        }
    }

    function setCodec(string calldata _funcSig, address _codec) public onlyOwner {
        bytes4 selector = bytes4(keccak256(bytes(_funcSig)));
        _setCodec(selector, _codec);
        emit CodecUpdated(selector, _codec);
    }

    function _setCodec(bytes4 _selector, address _codec) private {
        selector2codec[_selector] = ICodec(_codec);
        codecs.push(_codec);
    }

    function loadCodecs(ICodec.SwapDescription[] memory _swaps) internal view returns (ICodec[] memory) {
        ICodec[] memory _codecs = new ICodec[](_swaps.length);
        for (uint256 i = 0; i < _swaps.length; i++) {
            bytes4 selector = bytes4(_swaps[i].data);
            _codecs[i] = selector2codec[selector];
            require(address(_codecs[i]) != address(0), "cdc no found");
        }
        return (_codecs);
    }

    function getCodec(
        bytes4[] memory _selectors,
        ICodec[] memory _codecs,
        bytes4 _selector
    ) internal pure returns (ICodec) {
        for (uint256 i = 0; i < _codecs.length; i++) {
            if (_selector == _selectors[i]) {
                return _codecs[i];
            }
        }
        revert("cdc no found");
    }
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.12;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IWETH is IERC20 {
    function deposit() external payable;

    function withdraw(uint256) external;
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.8.12;

import "@openzeppelin/contracts/access/Ownable.sol";

/**
 * @title Manages a list supported dex
 * @author Padoriku
 */
abstract contract DexRegistry is Ownable {
    event SupportedDexUpdated(address dex, bytes4 selector, bool enabled);

    mapping(address => mapping(bytes4 => bool)) public dexRegistry;

    constructor(address[] memory _supportedDexList, string[] memory _supportedFuncs) {
        for (uint256 i = 0; i < _supportedDexList.length; i++) {
            bytes4 selector = bytes4(keccak256(bytes(_supportedFuncs[i])));
            _setSupportedDex(_supportedDexList[i], selector, true);
        }
    }

    function setSupportedDex(
        address _dex,
        bytes4 _selector,
        bool _enabled
    ) external onlyOwner {
        _setSupportedDex(_dex, _selector, _enabled);
        emit SupportedDexUpdated(_dex, _selector, _enabled);
    }

    function _setSupportedDex(
        address _dex,
        bytes4 _selector,
        bool _enabled
    ) private {
        bool enabled = dexRegistry[_dex][_selector];
        require(enabled != _enabled, "nop");
        dexRegistry[_dex][_selector] = _enabled;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 800,
    "details": {
      "yul": false
    }
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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MsgDataTypes.BridgeSendType","name":"bridgeType","type":"uint8"},{"internalType":"uint64","name":"nonce","type":"uint64"},{"internalType":"bool","name":"nativeIn","type":"bool"},{"internalType":"bool","name":"nativeOut","type":"bool"},{"internalType":"uint256","name":"fee","type":"uint256"},{"internalType":"uint256","name":"feeDeadline","type":"uint256"},{"internalType":"bytes","name":"feeSig","type":"bytes"},{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"address","name":"dstTokenOut","type":"address"},{"internalType":"bool","name":"allowPartialFill","type":"bool"}],"internalType":"struct TransferSwapper.TransferDescription","name":"_desc","type":"tuple"},{"components":[{"internalType":"address","name":"dex","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"internalType":"struct ICodec.SwapDescription[]","name":"_srcSwaps","type":"tuple[]"},{"components":[{"internalType":"address","name":"dex","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"internalType":"struct ICodec.SwapDescription[]","name":"_dstSwaps","type":"tuple[]"}],"name":"transferWithSwap","outputs":[],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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-----Decoded View---------------
Arg [0] : _messageBus (address): 0x0D71D18126E03646eb09FEc929e2ae87b7CAE69d
Arg [1] : _nativeWrap (address): 0x4200000000000000000000000000000000000006
Arg [2] : _signer (address): 0x26e6eAf3D3C5d4B8290AA7dd896140f383dFf043
Arg [3] : _feeCollector (address): 0xf0761BB438CeFca39A8fd1F27d75ccC7F6Df92d8
Arg [4] : _funcSigs (string[]): exactInput((bytes,address,uint256,uint256,uint256))
Arg [5] : _codecs (address[]): 0xdB7E4d4dd546a6Df6F9a312761e1B63C2036a782
Arg [6] : _supportedDexList (address[]): 0xE592427A0AEce92De3Edee1F18E0157C05861564
Arg [7] : _supportedDexFuncs (string[]): exactInput((bytes,address,uint256,uint256,uint256))

-----Encoded View---------------
22 Constructor Arguments found :
Arg [0] : 0000000000000000000000000d71d18126e03646eb09fec929e2ae87b7cae69d
Arg [1] : 0000000000000000000000004200000000000000000000000000000000000006
Arg [2] : 00000000000000000000000026e6eaf3d3c5d4b8290aa7dd896140f383dff043
Arg [3] : 000000000000000000000000f0761bb438cefca39a8fd1f27d75ccc7f6df92d8
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [5] : 00000000000000000000000000000000000000000000000000000000000001a0
Arg [6] : 00000000000000000000000000000000000000000000000000000000000001e0
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000220
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [9] : 0000000000000000000000000000000000000000000000000000000000000020
Arg [10] : 0000000000000000000000000000000000000000000000000000000000000033
Arg [11] : 6578616374496e707574282862797465732c616464726573732c75696e743235
Arg [12] : 362c75696e743235362c75696e74323536292900000000000000000000000000
Arg [13] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [14] : 000000000000000000000000db7e4d4dd546a6df6f9a312761e1b63c2036a782
Arg [15] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [16] : 000000000000000000000000e592427a0aece92de3edee1f18e0157c05861564
Arg [17] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [18] : 0000000000000000000000000000000000000000000000000000000000000020
Arg [19] : 0000000000000000000000000000000000000000000000000000000000000033
Arg [20] : 6578616374496e707574282862797465732c616464726573732c75696e743235
Arg [21] : 362c75696e743235362c75696e74323536292900000000000000000000000000