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// SPDX-License-Identifier: Apache 2
pragma solidity ^0.8.17;

import {IWETH} from "../interfaces/IWETH.sol";
import {IWormhole} from "../interfaces/IWormhole.sol";
import {ITokenBridge} from "../interfaces/ITokenBridge.sol";

import "../libraries/BytesLib.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import "example-messaging-executor/evm/src/interfaces/IExecutor.sol";
import "example-messaging-executor/evm/src/interfaces/IVaaV1Receiver.sol";
import "example-messaging-executor/evm/src/libraries/ExecutorMessages.sol";

import "./TokenBridgeRelayerMessages.sol";
import "./TokenBridgeRelayerGetters.sol";

string constant tokenBridgeRelayerVersion = "TokenBridgeRelayer-0.4.0";

/**
 * @title Wormhole Token Bridge Relayer
 * @notice This contract composes on Wormhole's Token Bridge contracts to facilitate
 * one-click transfers of Token Bridge supported assets cross chain.
 */
contract TokenBridgeRelayer is
    TokenBridgeRelayerGetters,
    TokenBridgeRelayerMessages,
    ReentrancyGuard,
    IVaaV1Receiver
{
    using BytesLib for bytes;

    // contract version
    string public constant VERSION = tokenBridgeRelayerVersion;

    // Wormhole chain ID of this contract
    uint16 public immutable chainId;
    // boolean to determine if weth is unwrappable
    bool public immutable unwrapWeth;
    // address of WETH on this chain
    IWETH public immutable weth;
    // address of the Wormhole contract on this chain
    IWormhole public immutable wormhole;
    // address of the Wormhole TokenBridge contract on this chain
    ITokenBridge public immutable tokenBridge;
    bytes32 public immutable tokenBridgeEmitter;
    // address of the Executor contract on this chain
    IExecutor public immutable executor;

    constructor(address tokenBridge_, bool unwrapWeth_, address executor_) {
        assert(tokenBridge_ != address(0));
        assert(executor_ != address(0));

        tokenBridge = ITokenBridge(payable(tokenBridge_));
        tokenBridgeEmitter = bytes32(uint256(uint160(tokenBridge_)));
        weth = tokenBridge.WETH();
        unwrapWeth = unwrapWeth_;

        if (unwrapWeth) {
            assert(address(weth) != address(0));
        }

        chainId = tokenBridge.chainId();
        wormhole = tokenBridge.wormhole();

        executor = IExecutor(payable(executor_));
    }

    /**
     * @notice Emitted when a transfer is completed by the Wormhole token bridge
     * @param emitterChainId Wormhole chain ID of emitter contract on the source chain
     * @param emitterAddress Address (bytes32 zero-left-padded) of emitter on the source chain
     * @param sequence Sequence of the Wormhole message
     */
    event TransferRedeemed(uint16 indexed emitterChainId, bytes32 indexed emitterAddress, uint64 indexed sequence);

    /**
     * @notice Calls Wormhole's Token Bridge contract to emit a contract-controlled
     * transfer. The transfer message includes the target recipient on the destination chain.
     * @param token ERC20 token address to transfer cross chain.
     * @param amount Quantity of tokens to be transferred.
     * @param targetChain Wormhole chain ID of the target blockchain.
     * @param targetRecipient User's wallet address on the target blockchain in bytes32 format
     * (zero-left-padded).
     * @param nonce Wormhole message nonce
     * @param dstTransferRecipient Token Bridge payload 3 recipient
     * @param dstExecutionAddress Executor destination address
     * @param executionAmount msg.value to be sent to the execution payee
     * @param refundAddr Executor refund address on this chain
     * @param signedQuoteBytes Executor signed quote
     * @param relayInstructions Executor relay instructions
     * @return messageSequence Wormhole sequence for emitted TransferTokensWithRelay message.
     */
    function transferTokensWithRelay(
        address token,
        uint256 amount,
        uint16 targetChain,
        bytes32 targetRecipient,
        uint32 nonce,
        bytes32 dstTransferRecipient,
        bytes32 dstExecutionAddress,
        uint256 executionAmount,
        address refundAddr,
        bytes calldata signedQuoteBytes,
        bytes calldata relayInstructions
    ) public payable nonReentrant returns (uint64 messageSequence) {
        // Cache wormhole fee and confirm that the user has passed enough
        // value to cover the wormhole protocol fee.
        uint256 wormholeFee = wormhole.messageFee();
        require(msg.value == wormholeFee + executionAmount, "insufficient value");

        // Cache token decimals, and remove dust from the amount argument. This
        // ensures that the dust is never transferred to this contract.
        uint8 tokenDecimals = getDecimals(token);
        amount = denormalizeAmount(normalizeAmount(amount, tokenDecimals), tokenDecimals);

        // Transfer tokens from user to the this contract, and
        // override amount with actual amount received.
        amount = custodyTokens(token, amount);

        // call the internal _transferTokensWithRelay function
        messageSequence = _transferTokensWithRelay(
            InternalTransferParams({
                token: token,
                tokenDecimals: tokenDecimals,
                amount: amount,
                targetChain: targetChain,
                targetRecipient: targetRecipient,
                nonce: nonce,
                wormholeFee: wormholeFee,
                dstTransferRecipient: dstTransferRecipient,
                dstExecutionAddress: dstExecutionAddress,
                executionAmount: executionAmount,
                refundAddr: refundAddr
            }),
            signedQuoteBytes,
            relayInstructions
        );
    }

    /**
     * @notice Wraps Ether and calls Wormhole's Token Bridge contract to emit
     * a contract-controlled transfer. The transfer message includes an arbitrary
     * payload with instructions for how to handle relayer payments on the target
     * contract and the quantity of tokens to convert into native assets for the user.
     * @param targetChain Wormhole chain ID of the target blockchain.
     * @param targetRecipient User's wallet address on the target blockchain in bytes32 format
     * (zero-left-padded).
     * @param nonce Wormhole message nonce
     * @return messageSequence Wormhole sequence for emitted TransferTokensWithRelay message.
     */
    function wrapAndTransferEthWithRelay(
        uint16 targetChain,
        bytes32 targetRecipient,
        uint32 nonce,
        bytes32 dstTransferRecipient,
        bytes32 dstExecutionAddress,
        uint256 executionAmount,
        address refundAddr,
        bytes calldata signedQuoteBytes,
        bytes calldata relayInstructions
    ) public payable returns (uint64 messageSequence) {
        require(unwrapWeth, "WETH functionality not supported");

        // Cache wormhole fee and confirm that the user has passed enough
        // value to cover the wormhole protocol fee.
        uint256 wormholeFee = wormhole.messageFee();
        uint256 fees = wormholeFee + executionAmount;
        require(msg.value > fees, "insufficient value");

        // remove the wormhole protocol fee and execution payment from the amount
        uint256 amount = msg.value - fees;

        // refund dust
        uint256 dust = amount - denormalizeAmount(normalizeAmount(amount, 18), 18);
        if (dust > 0) {
            (bool success,) = payable(msg.sender).call{value: dust}("");
            require(success, "Failed to refund dust");
        }

        // remove dust from amount and cache WETH
        uint256 amountLessDust = amount - dust;

        // deposit into the WETH contract
        weth.deposit{value: amountLessDust}();

        // call the internal _transferTokensWithRelay function
        messageSequence = _transferTokensWithRelay(
            InternalTransferParams({
                token: address(weth),
                tokenDecimals: 18,
                amount: amountLessDust,
                targetChain: targetChain,
                targetRecipient: targetRecipient,
                nonce: nonce,
                wormholeFee: wormholeFee,
                dstTransferRecipient: dstTransferRecipient,
                dstExecutionAddress: dstExecutionAddress,
                executionAmount: executionAmount,
                refundAddr: refundAddr
            }),
            signedQuoteBytes,
            relayInstructions
        );
    }

    function _transferTokensWithRelay(
        InternalTransferParams memory params,
        bytes calldata signedQuoteBytes,
        bytes calldata relayInstructions
    ) internal returns (uint64 messageSequence) {
        // sanity check function arguments
        require(params.targetRecipient != bytes32(0), "targetRecipient cannot be bytes32(0)");

        /**
         * Cache the normalized amount and verify that it's nonzero.
         * The token bridge performs the same operation before encoding
         * the amount in the `TransferWithPayload` message.
         */
        uint256 normalizedAmount = normalizeAmount(params.amount, params.tokenDecimals);
        require(normalizedAmount > 0, "normalized amount must be > 0");

        /**
         * Encode instructions (TransferWithRelay) to send with the token transfer.
         * The `targetRecipient` address is in bytes32 format (zero-left-padded) to
         * support non-evm smart contracts that have addresses that are longer
         * than 20 bytes.
         *
         * We normalize the relayerFee and toNativeTokenAmount to support
         * non-evm smart contracts that can only handle uint64.max values.
         */
        bytes memory messagePayload =
            encodeTransferWithRelay(TransferWithRelay({targetRecipient: params.targetRecipient}));

        // approve the token bridge to spend the specified tokens
        SafeERC20.safeApprove(IERC20(params.token), address(tokenBridge), params.amount);

        /**
         * Call `transferTokensWithPayload` method on the token bridge and pay
         * the Wormhole network fee. The token bridge will emit a Wormhole
         * message with an encoded `TransferWithPayload` struct (see the
         * ITokenBridge.sol interface file in this repo).
         */
        messageSequence = tokenBridge.transferTokensWithPayload{value: params.wormholeFee}(
            params.token, params.amount, params.targetChain, params.dstTransferRecipient, params.nonce, messagePayload
        );

        executor.requestExecution{value: params.executionAmount}(
            params.targetChain,
            params.dstExecutionAddress,
            params.refundAddr,
            signedQuoteBytes,
            ExecutorMessages.makeVAAv1Request(chainId, tokenBridgeEmitter, messageSequence),
            relayInstructions
        );
    }

    /**
     * @notice Calls Wormhole's Token Bridge contract to complete token transfers. Takes
     * custody of the wrapped (or released) tokens and sends the tokens to the target recipient.
     * It pays the fee recipient in the minted token denomination. If requested by the user,
     * it will perform a swap with the off-chain relayer to provide the user with native assets.
     * If the `token` being transferred is WETH, the contract will unwrap native assets and send
     * the transferred amount to the recipient and pay the fee recipient in native assets.
     * @dev reverts if:
     * - the transferred token is not accepted by this contract
     * - the transferred token is not attested on this blockchain's Token Bridge contract
     * - the emitter of the transfer message is not registered with this contract
     * - the relayer fails to provide enough native assets to facilitate a native swap
     * - the recipient attempts to swap native assets when performing a self redemption
     * @param encodedTransferMessage Attested `TransferWithPayload` wormhole message.
     */
    function executeVAAv1(bytes calldata encodedTransferMessage) public payable {
        // complete the transfer by calling the token bridge
        (bytes memory payload, uint256 amount, address token) = _completeTransfer(encodedTransferMessage);

        // parse the payload into the `TransferWithRelay` struct
        TransferWithRelay memory transferWithRelay = decodeTransferWithRelay(payload);

        // cache the recipient address and unwrap weth flag
        address recipient = bytes32ToAddress(transferWithRelay.targetRecipient);

        // transfer the full amount to the recipient
        if (token == address(weth) && unwrapWeth) {
            // withdraw weth and send to the recipient
            weth.withdraw(amount);
            (bool success,) = payable(recipient).call{value: amount}("");
            require(success, "Failed to transfer to recipient");
        } else {
            SafeERC20.safeTransfer(IERC20(token), recipient, amount);
        }
    }

    function _completeTransfer(bytes memory encodedTransferMessage) internal returns (bytes memory, uint256, address) {
        /**
         * parse the encoded Wormhole message
         *
         * SECURITY: This message not been verified by the Wormhole core layer yet.
         * The encoded payload can only be trusted once the message has been verified
         * by the Wormhole core contract. In this case, the message will be verified
         * by a call to the token bridge contract in subsequent actions.
         */
        IWormhole.VM memory parsedMessage = wormhole.parseVM(encodedTransferMessage);

        /**
         * The amount encoded in the payload could be incorrect,
         * since fee-on-transfer tokens are supported by the token bridge.
         *
         * NOTE: The token bridge truncates the encoded amount for any token
         * with decimals greater than 8. This is to support blockchains that
         * cannot handle transfer amounts exceeding max(uint64).
         */
        address localTokenAddress = fetchLocalAddressFromTransferMessage(parsedMessage.payload);

        // check balance before completing the transfer
        uint256 balanceBefore = getBalance(localTokenAddress);

        /**
         * Call `completeTransferWithPayload` on the token bridge. This
         * method acts as a reentrancy protection since it does not allow
         * transfers to be redeemed more than once.
         */
        bytes memory transferPayload = tokenBridge.completeTransferWithPayload(encodedTransferMessage);

        // compute and save the balance difference after completing the transfer
        uint256 amountReceived = getBalance(localTokenAddress) - balanceBefore;

        // parse the wormhole message payload into the `TransferWithPayload` struct
        ITokenBridge.TransferWithPayload memory transfer = tokenBridge.parseTransferWithPayload(transferPayload);

        // emit event with information about the TransferWithPayload message
        emit TransferRedeemed(parsedMessage.emitterChainId, parsedMessage.emitterAddress, parsedMessage.sequence);

        return (transfer.payload, amountReceived, localTokenAddress);
    }

    /**
     * @notice Parses the encoded address and chainId from a `TransferWithPayload`
     * message. Finds the address of the wrapped token contract if the token is not
     * native to this chain.
     * @param payload Encoded `TransferWithPayload` message
     * @return localAddress Address of the encoded (bytes32 format) token address on
     * this chain.
     */
    function fetchLocalAddressFromTransferMessage(bytes memory payload) public view returns (address localAddress) {
        // parse the source token address and chainId
        bytes32 sourceAddress = payload.toBytes32(33);
        uint16 tokenChain = payload.toUint16(65);

        // Fetch the wrapped address from the token bridge if the token
        // is not from this chain.
        if (tokenChain != chainId) {
            // identify wormhole token bridge wrapper
            localAddress = tokenBridge.wrappedAsset(tokenChain, sourceAddress);
            require(localAddress != address(0), "token not attested");
        } else {
            // return the encoded address if the token is native to this chain
            localAddress = bytes32ToAddress(sourceAddress);
        }
    }

    function custodyTokens(address token, uint256 amount) internal returns (uint256) {
        // query own token balance before transfer
        uint256 balanceBefore = getBalance(token);

        // deposit tokens
        SafeERC20.safeTransferFrom(IERC20(token), msg.sender, address(this), amount);

        // return the balance difference
        return getBalance(token) - balanceBefore;
    }

    function bytes32ToAddress(bytes32 address_) internal pure returns (address) {
        require(bytes12(address_) == 0, "invalid EVM address");
        return address(uint160(uint256(address_)));
    }

    // necessary for receiving native assets
    receive() external payable {}
}

// contracts/Bridge.sol
// SPDX-License-Identifier: Apache 2

pragma solidity ^0.8.17;

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

interface IWETH is IERC20 {
    function deposit() external payable;
    function withdraw(uint256 amount) external;
    function balanceOf() external returns (uint256);
}

// contracts/Messages.sol
// SPDX-License-Identifier: Apache 2

pragma solidity ^0.8.17;

interface IWormhole {
    struct GuardianSet {
        address[] keys;
        uint32 expirationTime;
    }

    struct Signature {
        bytes32 r;
        bytes32 s;
        uint8 v;
        uint8 guardianIndex;
    }

    struct VM {
        uint8 version;
        uint32 timestamp;
        uint32 nonce;
        uint16 emitterChainId;
        bytes32 emitterAddress;
        uint64 sequence;
        uint8 consistencyLevel;
        bytes payload;
        uint32 guardianSetIndex;
        Signature[] signatures;
        bytes32 hash;
    }

    event LogMessagePublished(
        address indexed sender, uint64 sequence, uint32 nonce, bytes payload, uint8 consistencyLevel
    );

    function publishMessage(uint32 nonce, bytes memory payload, uint8 consistencyLevel)
        external
        payable
        returns (uint64 sequence);

    function parseAndVerifyVM(bytes calldata encodedVM)
        external
        view
        returns (VM memory vm, bool valid, string memory reason);

    function verifyVM(VM memory vm) external view returns (bool valid, string memory reason);

    function verifySignatures(bytes32 hash, Signature[] memory signatures, GuardianSet memory guardianSet)
        external
        pure
        returns (bool valid, string memory reason);

    function parseVM(bytes memory encodedVM) external pure returns (VM memory vm);

    function getGuardianSet(uint32 index) external view returns (GuardianSet memory);

    function getCurrentGuardianSetIndex() external view returns (uint32);

    function getGuardianSetExpiry() external view returns (uint32);

    function governanceActionIsConsumed(bytes32 hash) external view returns (bool);

    function isInitialized(address impl) external view returns (bool);

    function chainId() external view returns (uint16);

    function governanceChainId() external view returns (uint16);

    function governanceContract() external view returns (bytes32);

    function messageFee() external view returns (uint256);

    function evmChainId() external view returns (uint256);

    function nextSequence(address emitter) external view returns (uint64);
}

// SPDX-License-Identifier: Apache 2

pragma solidity ^0.8.17;

import "./IWETH.sol";
import "./IWormhole.sol";

interface ITokenBridge {
    struct Transfer {
        uint8 payloadID;
        uint256 amount;
        bytes32 tokenAddress;
        uint16 tokenChain;
        bytes32 to;
        uint16 toChain;
        uint256 fee;
    }

    struct TransferWithPayload {
        uint8 payloadID;
        uint256 amount;
        bytes32 tokenAddress;
        uint16 tokenChain;
        bytes32 to;
        uint16 toChain;
        bytes32 fromAddress;
        bytes payload;
    }

    struct AssetMeta {
        uint8 payloadID;
        bytes32 tokenAddress;
        uint16 tokenChain;
        uint8 decimals;
        bytes32 symbol;
        bytes32 name;
    }

    struct RegisterChain {
        bytes32 module;
        uint8 action;
        uint16 chainId;
        uint16 emitterChainID;
        bytes32 emitterAddress;
    }

    struct UpgradeContract {
        bytes32 module;
        uint8 action;
        uint16 chainId;
        bytes32 newContract;
    }

    struct RecoverChainId {
        bytes32 module;
        uint8 action;
        uint256 evmChainId;
        uint16 newChainId;
    }

    event ContractUpgraded(address indexed oldContract, address indexed newContract);

    function _parseTransferCommon(bytes memory encoded) external pure returns (Transfer memory transfer);

    function attestToken(address tokenAddress, uint32 nonce) external payable returns (uint64 sequence);

    function wrapAndTransferETH(uint16 recipientChain, bytes32 recipient, uint256 arbiterFee, uint32 nonce)
        external
        payable
        returns (uint64 sequence);

    function wrapAndTransferETHWithPayload(uint16 recipientChain, bytes32 recipient, uint32 nonce, bytes memory payload)
        external
        payable
        returns (uint64 sequence);

    function transferTokens(
        address token,
        uint256 amount,
        uint16 recipientChain,
        bytes32 recipient,
        uint256 arbiterFee,
        uint32 nonce
    ) external payable returns (uint64 sequence);

    function transferTokensWithPayload(
        address token,
        uint256 amount,
        uint16 recipientChain,
        bytes32 recipient,
        uint32 nonce,
        bytes memory payload
    ) external payable returns (uint64 sequence);

    function updateWrapped(bytes memory encodedVm) external returns (address token);

    function createWrapped(bytes memory encodedVm) external returns (address token);

    function completeTransferWithPayload(bytes memory encodedVm) external returns (bytes memory);

    function completeTransferAndUnwrapETHWithPayload(bytes memory encodedVm) external returns (bytes memory);

    function completeTransfer(bytes memory encodedVm) external;

    function completeTransferAndUnwrapETH(bytes memory encodedVm) external;

    function encodeAssetMeta(AssetMeta memory meta) external pure returns (bytes memory encoded);

    function encodeTransfer(Transfer memory transfer) external pure returns (bytes memory encoded);

    function encodeTransferWithPayload(TransferWithPayload memory transfer)
        external
        pure
        returns (bytes memory encoded);

    function parsePayloadID(bytes memory encoded) external pure returns (uint8 payloadID);

    function parseAssetMeta(bytes memory encoded) external pure returns (AssetMeta memory meta);

    function parseTransfer(bytes memory encoded) external pure returns (Transfer memory transfer);

    function parseTransferWithPayload(bytes memory encoded)
        external
        pure
        returns (TransferWithPayload memory transfer);

    function governanceActionIsConsumed(bytes32 hash) external view returns (bool);

    function isInitialized(address impl) external view returns (bool);

    function isTransferCompleted(bytes32 hash) external view returns (bool);

    function wormhole() external view returns (IWormhole);

    function chainId() external view returns (uint16);

    function evmChainId() external view returns (uint256);

    function isFork() external view returns (bool);

    function governanceChainId() external view returns (uint16);

    function governanceContract() external view returns (bytes32);

    function wrappedAsset(uint16 tokenChainId, bytes32 tokenAddress) external view returns (address);

    function bridgeContracts(uint16 chainId_) external view returns (bytes32);

    function tokenImplementation() external view returns (address);

    function WETH() external view returns (IWETH);

    function outstandingBridged(address token) external view returns (uint256);

    function isWrappedAsset(address token) external view returns (bool);

    function finality() external view returns (uint8);

    function implementation() external view returns (address);

    function initialize() external;

    function registerChain(bytes memory encodedVM) external;

    function upgrade(bytes memory encodedVM) external;

    function submitRecoverChainId(bytes memory encodedVM) external;

    function parseRegisterChain(bytes memory encoded) external pure returns (RegisterChain memory chain);

    function parseUpgrade(bytes memory encoded) external pure returns (UpgradeContract memory chain);

    function parseRecoverChainId(bytes memory encodedRecoverChainId)
        external
        pure
        returns (RecoverChainId memory rci);
}

// SPDX-License-Identifier: Unlicense
/*
 * @title Solidity Bytes Arrays Utils
 * @author Gonçalo Sá <[email protected]>
 *
 * @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity.
 *      The library lets you concatenate, slice and type cast bytes arrays both in memory and storage.
 */
pragma solidity >=0.8.0 <0.9.0;

library BytesLib {
    function concat(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bytes memory) {
        bytes memory tempBytes;

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

            // Store the length of the first bytes array at the beginning of
            // the memory for tempBytes.
            let length := mload(_preBytes)
            mstore(tempBytes, length)

            // Maintain a memory counter for the current write location in the
            // temp bytes array by adding the 32 bytes for the array length to
            // the starting location.
            let mc := add(tempBytes, 0x20)
            // Stop copying when the memory counter reaches the length of the
            // first bytes array.
            let end := add(mc, length)

            for {
                // Initialize a copy counter to the start of the _preBytes data,
                // 32 bytes into its memory.
                let cc := add(_preBytes, 0x20)
            } lt(mc, end) {
                // Increase both counters by 32 bytes each iteration.
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } {
                // Write the _preBytes data into the tempBytes memory 32 bytes
                // at a time.
                mstore(mc, mload(cc))
            }

            // Add the length of _postBytes to the current length of tempBytes
            // and store it as the new length in the first 32 bytes of the
            // tempBytes memory.
            length := mload(_postBytes)
            mstore(tempBytes, add(length, mload(tempBytes)))

            // Move the memory counter back from a multiple of 0x20 to the
            // actual end of the _preBytes data.
            mc := end
            // Stop copying when the memory counter reaches the new combined
            // length of the arrays.
            end := add(mc, length)

            for { let cc := add(_postBytes, 0x20) } lt(mc, end) {
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } { mstore(mc, mload(cc)) }

            // Update the free-memory pointer by padding our last write location
            // to 32 bytes: add 31 bytes to the end of tempBytes to move to the
            // next 32 byte block, then round down to the nearest multiple of
            // 32. If the sum of the length of the two arrays is zero then add
            // one before rounding down to leave a blank 32 bytes (the length block with 0).
            mstore(
                0x40,
                and(
                    add(add(end, iszero(add(length, mload(_preBytes)))), 31),
                    not(31) // Round down to the nearest 32 bytes.
                )
            )
        }

        return tempBytes;
    }

    function concatStorage(bytes storage _preBytes, bytes memory _postBytes) internal {
        assembly {
            // Read the first 32 bytes of _preBytes storage, which is the length
            // of the array. (We don't need to use the offset into the slot
            // because arrays use the entire slot.)
            let fslot := sload(_preBytes.slot)
            // Arrays of 31 bytes or less have an even value in their slot,
            // while longer arrays have an odd value. The actual length is
            // the slot divided by two for odd values, and the lowest order
            // byte divided by two for even values.
            // If the slot is even, bitwise and the slot with 255 and divide by
            // two to get the length. If the slot is odd, bitwise and the slot
            // with -1 and divide by two.
            let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)
            let mlength := mload(_postBytes)
            let newlength := add(slength, mlength)
            // slength can contain both the length and contents of the array
            // if length < 32 bytes so let's prepare for that
            // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage
            switch add(lt(slength, 32), lt(newlength, 32))
            case 2 {
                // Since the new array still fits in the slot, we just need to
                // update the contents of the slot.
                // uint256(bytes_storage) = uint256(bytes_storage) + uint256(bytes_memory) + new_length
                sstore(
                    _preBytes.slot,
                    // all the modifications to the slot are inside this
                    // next block
                    add(
                        // we can just add to the slot contents because the
                        // bytes we want to change are the LSBs
                        fslot,
                        add(
                            mul(
                                div(
                                    // load the bytes from memory
                                    mload(add(_postBytes, 0x20)),
                                    // zero all bytes to the right
                                    exp(0x100, sub(32, mlength))
                                ),
                                // and now shift left the number of bytes to
                                // leave space for the length in the slot
                                exp(0x100, sub(32, newlength))
                            ),
                            // increase length by the double of the memory
                            // bytes length
                            mul(mlength, 2)
                        )
                    )
                )
            }
            case 1 {
                // The stored value fits in the slot, but the combined value
                // will exceed it.
                // get the keccak hash to get the contents of the array
                mstore(0x0, _preBytes.slot)
                let sc := add(keccak256(0x0, 0x20), div(slength, 32))

                // save new length
                sstore(_preBytes.slot, add(mul(newlength, 2), 1))

                // The contents of the _postBytes array start 32 bytes into
                // the structure. Our first read should obtain the `submod`
                // bytes that can fit into the unused space in the last word
                // of the stored array. To get this, we read 32 bytes starting
                // from `submod`, so the data we read overlaps with the array
                // contents by `submod` bytes. Masking the lowest-order
                // `submod` bytes allows us to add that value directly to the
                // stored value.

                let submod := sub(32, slength)
                let mc := add(_postBytes, submod)
                let end := add(_postBytes, mlength)
                let mask := sub(exp(0x100, submod), 1)

                sstore(
                    sc,
                    add(
                        and(fslot, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00),
                        and(mload(mc), mask)
                    )
                )

                for {
                    mc := add(mc, 0x20)
                    sc := add(sc, 1)
                } lt(mc, end) {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } { sstore(sc, mload(mc)) }

                mask := exp(0x100, sub(mc, end))

                sstore(sc, mul(div(mload(mc), mask), mask))
            }
            default {
                // get the keccak hash to get the contents of the array
                mstore(0x0, _preBytes.slot)
                // Start copying to the last used word of the stored array.
                let sc := add(keccak256(0x0, 0x20), div(slength, 32))

                // save new length
                sstore(_preBytes.slot, add(mul(newlength, 2), 1))

                // Copy over the first `submod` bytes of the new data as in
                // case 1 above.
                let slengthmod := mod(slength, 32)
                let mlengthmod := mod(mlength, 32)
                let submod := sub(32, slengthmod)
                let mc := add(_postBytes, submod)
                let end := add(_postBytes, mlength)
                let mask := sub(exp(0x100, submod), 1)

                sstore(sc, add(sload(sc), and(mload(mc), mask)))

                for {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } lt(mc, end) {
                    sc := add(sc, 1)
                    mc := add(mc, 0x20)
                } { sstore(sc, mload(mc)) }

                mask := exp(0x100, sub(mc, end))

                sstore(sc, mul(div(mload(mc), mask), mask))
            }
        }
    }

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

        bytes memory tempBytes;

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

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

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

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

                mstore(tempBytes, _length)

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

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

        return tempBytes;
    }

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

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

        return tempAddress;
    }

    function toUint8(bytes memory _bytes, uint256 _start) internal pure returns (uint8) {
        require(_bytes.length >= _start + 1, "toUint8_outOfBounds");
        uint8 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x1), _start))
        }

        return tempUint;
    }

    function toUint16(bytes memory _bytes, uint256 _start) internal pure returns (uint16) {
        require(_bytes.length >= _start + 2, "toUint16_outOfBounds");
        uint16 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x2), _start))
        }

        return tempUint;
    }

    function toUint32(bytes memory _bytes, uint256 _start) internal pure returns (uint32) {
        require(_bytes.length >= _start + 4, "toUint32_outOfBounds");
        uint32 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x4), _start))
        }

        return tempUint;
    }

    function toUint64(bytes memory _bytes, uint256 _start) internal pure returns (uint64) {
        require(_bytes.length >= _start + 8, "toUint64_outOfBounds");
        uint64 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x8), _start))
        }

        return tempUint;
    }

    function toUint96(bytes memory _bytes, uint256 _start) internal pure returns (uint96) {
        require(_bytes.length >= _start + 12, "toUint96_outOfBounds");
        uint96 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0xc), _start))
        }

        return tempUint;
    }

    function toUint128(bytes memory _bytes, uint256 _start) internal pure returns (uint128) {
        require(_bytes.length >= _start + 16, "toUint128_outOfBounds");
        uint128 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x10), _start))
        }

        return tempUint;
    }

    function toUint256(bytes memory _bytes, uint256 _start) internal pure returns (uint256) {
        require(_bytes.length >= _start + 32, "toUint256_outOfBounds");
        uint256 tempUint;

        assembly {
            tempUint := mload(add(add(_bytes, 0x20), _start))
        }

        return tempUint;
    }

    function toBytes32(bytes memory _bytes, uint256 _start) internal pure returns (bytes32) {
        require(_bytes.length >= _start + 32, "toBytes32_outOfBounds");
        bytes32 tempBytes32;

        assembly {
            tempBytes32 := mload(add(add(_bytes, 0x20), _start))
        }

        return tempBytes32;
    }

    function equal(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bool) {
        bool success = true;

        assembly {
            let length := mload(_preBytes)

            // if lengths don't match the arrays are not equal
            switch eq(length, mload(_postBytes))
            case 1 {
                // cb is a circuit breaker in the for loop since there's
                //  no said feature for inline assembly loops
                // cb = 1 - don't breaker
                // cb = 0 - break
                let cb := 1

                let mc := add(_preBytes, 0x20)
                let end := add(mc, length)

                for { let cc := add(_postBytes, 0x20) }
                // the next line is the loop condition:
                // while(uint256(mc < end) + cb == 2)
                eq(add(lt(mc, end), cb), 2) {
                    mc := add(mc, 0x20)
                    cc := add(cc, 0x20)
                } {
                    // if any of these checks fails then arrays are not equal
                    if iszero(eq(mload(mc), mload(cc))) {
                        // unsuccess:
                        success := 0
                        cb := 0
                    }
                }
            }
            default {
                // unsuccess:
                success := 0
            }
        }

        return success;
    }

    function equalStorage(bytes storage _preBytes, bytes memory _postBytes) internal view returns (bool) {
        bool success = true;

        assembly {
            // we know _preBytes_offset is 0
            let fslot := sload(_preBytes.slot)
            // Decode the length of the stored array like in concatStorage().
            let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)
            let mlength := mload(_postBytes)

            // if lengths don't match the arrays are not equal
            switch eq(slength, mlength)
            case 1 {
                // slength can contain both the length and contents of the array
                // if length < 32 bytes so let's prepare for that
                // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage
                if iszero(iszero(slength)) {
                    switch lt(slength, 32)
                    case 1 {
                        // blank the last byte which is the length
                        fslot := mul(div(fslot, 0x100), 0x100)

                        if iszero(eq(fslot, mload(add(_postBytes, 0x20)))) {
                            // unsuccess:
                            success := 0
                        }
                    }
                    default {
                        // cb is a circuit breaker in the for loop since there's
                        //  no said feature for inline assembly loops
                        // cb = 1 - don't breaker
                        // cb = 0 - break
                        let cb := 1

                        // get the keccak hash to get the contents of the array
                        mstore(0x0, _preBytes.slot)
                        let sc := keccak256(0x0, 0x20)

                        let mc := add(_postBytes, 0x20)
                        let end := add(mc, mlength)

                        // the next line is the loop condition:
                        // while(uint256(mc < end) + cb == 2)
                        for {} eq(add(lt(mc, end), cb), 2) {
                            sc := add(sc, 1)
                            mc := add(mc, 0x20)
                        } {
                            if iszero(eq(sload(sc), mload(mc))) {
                                // unsuccess:
                                success := 0
                                cb := 0
                            }
                        }
                    }
                }
            }
            default {
                // unsuccess:
                success := 0
            }
        }

        return success;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

    function _nonReentrantAfter() private {
        // 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: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

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

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

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

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

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

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

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

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

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

// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.19;

interface IExecutor {
    struct SignedQuoteHeader {
        bytes4 prefix;
        address quoterAddress;
        bytes32 payeeAddress;
        uint16 srcChain;
        uint16 dstChain;
        uint64 expiryTime;
    }

    event RequestForExecution(
        address indexed quoterAddress,
        uint256 amtPaid,
        uint16 dstChain,
        bytes32 dstAddr,
        address refundAddr,
        bytes signedQuote,
        bytes requestBytes,
        bytes relayInstructions
    );

    function requestExecution(
        uint16 dstChain,
        bytes32 dstAddr,
        address refundAddr,
        bytes calldata signedQuote,
        bytes calldata requestBytes,
        bytes calldata relayInstructions
    ) external payable;
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.19;

/// @notice Any contract that wishes to receive V1 VAAs from the executor needs to implement `IVaaV1Receiver`.
interface IVaaV1Receiver {
    /// @notice Receive an attested message from the executor relayer.
    /// @param msg The attested message payload.
    function executeVAAv1(bytes memory msg) external payable;
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.19;

library ExecutorMessages {
    bytes4 private constant REQ_MM = "ERM1";
    bytes4 private constant REQ_VAA_V1 = "ERV1";
    bytes4 private constant REQ_NTT_V1 = "ERN1";
    bytes4 private constant REQ_CCTP_V1 = "ERC1";
    bytes4 private constant REQ_CCTP_V2 = "ERC2";

    /// @notice Payload length will not fit in a uint32.
    /// @dev Selector: 492f620d.
    error PayloadTooLarge();

    /// @notice Encodes a modular messaging request payload.
    /// @param srcChain The source chain for the message (usually this chain).
    /// @param srcAddr The source address for the message.
    /// @param sequence The sequence number returned by `endpoint.sendMessage`.
    /// @param payload The full payload, the keccak of which was sent to `endpoint.sendMessage`.
    /// @return bytes The encoded request.
    function makeMMRequest(uint16 srcChain, address srcAddr, uint64 sequence, bytes memory payload)
        internal
        pure
        returns (bytes memory)
    {
        if (payload.length > type(uint32).max) {
            revert PayloadTooLarge();
        }
        return abi.encodePacked(
            REQ_MM, srcChain, bytes32(uint256(uint160(srcAddr))), sequence, uint32(payload.length), payload
        );
    }

    /// @notice Encodes a version 1 VAA request payload.
    /// @param emitterChain The emitter chain from the VAA.
    /// @param emitterAddress The emitter address from the VAA.
    /// @param sequence The sequence number from the VAA.
    /// @return bytes The encoded request.
    function makeVAAv1Request(uint16 emitterChain, bytes32 emitterAddress, uint64 sequence)
        internal
        pure
        returns (bytes memory)
    {
        return abi.encodePacked(REQ_VAA_V1, emitterChain, emitterAddress, sequence);
    }

    /// @notice Encodes a version 1 NTT request payload.
    /// @param srcChain The source chain for the NTT transfer.
    /// @param srcManager The source manager for the NTT transfer.
    /// @param messageId The manager message id for the NTT transfer.
    /// @return bytes The encoded request.
    function makeNTTv1Request(uint16 srcChain, bytes32 srcManager, bytes32 messageId)
        internal
        pure
        returns (bytes memory)
    {
        return abi.encodePacked(REQ_NTT_V1, srcChain, srcManager, messageId);
    }

    /// @notice Encodes a version 1 CCTP request payload.
    /// @param sourceDomain The source chain for the CCTP transfer.
    /// @param nonce The nonce of the CCTP transfer.
    /// @return bytes The encoded request.
    function makeCCTPv1Request(uint32 sourceDomain, uint64 nonce) internal pure returns (bytes memory) {
        return abi.encodePacked(REQ_CCTP_V1, sourceDomain, nonce);
    }

    /// @notice Encodes a version 2 CCTP request payload.
    ///         This request currently assumes the Executor will auto detect the event off chain.
    ///         That may change in the future, in which case this interface would change.
    /// @return bytes The encoded request.
    function makeCCTPv2Request() internal pure returns (bytes memory) {
        return abi.encodePacked(REQ_CCTP_V2, uint8(1));
    }
}

// SPDX-License-Identifier: Apache 2
pragma solidity ^0.8.17;

import "../libraries/BytesLib.sol";

import "./TokenBridgeRelayerStructs.sol";

abstract contract TokenBridgeRelayerMessages is TokenBridgeRelayerStructs {
    using BytesLib for bytes;

    /**
     * @notice Encodes the TransferWithRelay struct into bytes.
     * @param transfer TransferWithRelay struct.
     * @return encoded TransferWithRelay struct encoded into bytes.
     */
    function encodeTransferWithRelay(TransferWithRelay memory transfer) public pure returns (bytes memory encoded) {
        encoded = abi.encodePacked(transfer.targetRecipient);
    }

    /**
     * @notice Decodes an encoded `TransferWithRelay` struct.
     * @dev reverts if:
     * - the length of the payload has an unexpected length
     * @param encoded Encoded `TransferWithRelay` struct.
     * @return transfer `TransferTokenRelay` struct.
     */
    function decodeTransferWithRelay(bytes memory encoded) public pure returns (TransferWithRelay memory transfer) {
        uint256 index = 0;

        // recipient of the transferred tokens and native assets
        transfer.targetRecipient = encoded.toBytes32(index);
        index += 32;

        require(index == encoded.length, "invalid message length");
    }
}

// SPDX-License-Identifier: Apache 2
pragma solidity ^0.8.17;

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

abstract contract TokenBridgeRelayerGetters {
    function normalizeAmount(uint256 amount, uint8 decimals) public pure returns (uint256) {
        if (decimals > 8) {
            amount /= 10 ** (decimals - 8);
        }
        return amount;
    }

    function denormalizeAmount(uint256 amount, uint8 decimals) public pure returns (uint256) {
        if (decimals > 8) {
            amount *= 10 ** (decimals - 8);
        }
        return amount;
    }

    function getDecimals(address token) internal view returns (uint8) {
        (, bytes memory queriedDecimals) = token.staticcall(abi.encodeWithSignature("decimals()"));
        return abi.decode(queriedDecimals, (uint8));
    }

    function getBalance(address token) internal view returns (uint256 balance) {
        // fetch the specified token balance for this contract
        (, bytes memory queriedBalance) =
            token.staticcall(abi.encodeWithSelector(IERC20.balanceOf.selector, address(this)));
        balance = abi.decode(queriedBalance, (uint256));
    }
}

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

pragma solidity ^0.8.0;

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

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

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

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

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: Apache 2
pragma solidity ^0.8.17;

abstract contract TokenBridgeRelayerStructs {
    struct TransferWithRelay {
        bytes32 targetRecipient;
    }

    struct InternalTransferParams {
        address token;
        uint8 tokenDecimals;
        uint256 amount;
        uint16 targetChain;
        bytes32 targetRecipient;
        uint32 nonce;
        uint256 wormholeFee;
        bytes32 dstTransferRecipient;
        bytes32 dstExecutionAddress;
        uint256 executionAmount;
        address refundAddr;
    }
}

{
  "remappings": [
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "ds-test/=lib/openzeppelin-contracts/lib/forge-std/lib/ds-test/src/",
    "example-messaging-executor/=lib/example-messaging-executor/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": true,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"tokenBridge_","type":"address"},{"internalType":"bool","name":"unwrapWeth_","type":"bool"},{"internalType":"address","name":"executor_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint16","name":"emitterChainId","type":"uint16"},{"indexed":true,"internalType":"bytes32","name":"emitterAddress","type":"bytes32"},{"indexed":true,"internalType":"uint64","name":"sequence","type":"uint64"}],"name":"TransferRedeemed","type":"event"},{"inputs":[],"name":"VERSION","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"chainId","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"encoded","type":"bytes"}],"name":"decodeTransferWithRelay","outputs":[{"components":[{"internalType":"bytes32","name":"targetRecipient","type":"bytes32"}],"internalType":"struct TokenBridgeRelayerStructs.TransferWithRelay","name":"transfer","type":"tuple"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint8","name":"decimals","type":"uint8"}],"name":"denormalizeAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"targetRecipient","type":"bytes32"}],"internalType":"struct TokenBridgeRelayerStructs.TransferWithRelay","name":"transfer","type":"tuple"}],"name":"encodeTransferWithRelay","outputs":[{"internalType":"bytes","name":"encoded","type":"bytes"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"bytes","name":"encodedTransferMessage","type":"bytes"}],"name":"executeVAAv1","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"executor","outputs":[{"internalType":"contract IExecutor","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"payload","type":"bytes"}],"name":"fetchLocalAddressFromTransferMessage","outputs":[{"internalType":"address","name":"localAddress","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint8","name":"decimals","type":"uint8"}],"name":"normalizeAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"tokenBridge","outputs":[{"internalType":"contract ITokenBridge","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenBridgeEmitter","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint16","name":"targetChain","type":"uint16"},{"internalType":"bytes32","name":"targetRecipient","type":"bytes32"},{"internalType":"uint32","name":"nonce","type":"uint32"},{"internalType":"bytes32","name":"dstTransferRecipient","type":"bytes32"},{"internalType":"bytes32","name":"dstExecutionAddress","type":"bytes32"},{"internalType":"uint256","name":"executionAmount","type":"uint256"},{"internalType":"address","name":"refundAddr","type":"address"},{"internalType":"bytes","name":"signedQuoteBytes","type":"bytes"},{"internalType":"bytes","name":"relayInstructions","type":"bytes"}],"name":"transferTokensWithRelay","outputs":[{"internalType":"uint64","name":"messageSequence","type":"uint64"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"unwrapWeth","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"weth","outputs":[{"internalType":"contract IWETH","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"wormhole","outputs":[{"internalType":"contract IWormhole","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"targetChain","type":"uint16"},{"internalType":"bytes32","name":"targetRecipient","type":"bytes32"},{"internalType":"uint32","name":"nonce","type":"uint32"},{"internalType":"bytes32","name":"dstTransferRecipient","type":"bytes32"},{"internalType":"bytes32","name":"dstExecutionAddress","type":"bytes32"},{"internalType":"uint256","name":"executionAmount","type":"uint256"},{"internalType":"address","name":"refundAddr","type":"address"},{"internalType":"bytes","name":"signedQuoteBytes","type":"bytes"},{"internalType":"bytes","name":"relayInstructions","type":"bytes"}],"name":"wrapAndTransferEthWithRelay","outputs":[{"internalType":"uint64","name":"messageSequence","type":"uint64"}],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000b1731c586ca89a23809861c6103f0b96b3f57d92000000000000000000000000000000000000000000000000000000000000000100000000000000000000000085d06449c78064c2e02d787e9dc71716786f8d19

-----Decoded View---------------
Arg [0] : tokenBridge_ (address): 0xB1731c586ca89a23809861c6103F0b96B3F57D92
Arg [1] : unwrapWeth_ (bool): True
Arg [2] : executor_ (address): 0x85D06449C78064c2E02d787e9DC71716786F8D19

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000b1731c586ca89a23809861c6103f0b96b3f57d92
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [2] : 00000000000000000000000085d06449c78064c2e02d787e9dc71716786f8d19