// File: contracts/bridges/CBridgeAdapter.sol



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

pragma solidity >=0.8.15;

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

import "../lib/MessageSenderLib.sol";
import "../lib/MessageReceiverApp.sol";
import "../interfaces/IBridgeAdapter.sol";
import "../interfaces/ITransferSwapper.sol";
import "../interfaces/IIntermediaryOriginalToken.sol";

contract CBridgeAdapter is MessageReceiverApp, IBridgeAdapter {
    using SafeERC20 for IERC20;
    
    address public mainContract;

    event MainContractUpdated(address mainContract);

    modifier onlyMainContract() {
        require(msg.sender == mainContract, "caller is not main contract");
        _;
    }

    constructor(address _mainContract, address _messageBus) {
        mainContract = _mainContract;
        messageBus = _messageBus;
    }

    struct CBridgeParams {
        // type of the bridge in cBridge to use (i.e. liquidity bridge, pegged token bridge, etc.)
        MsgDataTypes.BridgeSendType bridgeType;
        // user defined maximum allowed slippage (pip) at bridge
        uint32 maxSlippage;
        // if this field is set, this contract attempts to wrap the input OR src bridge out token
        // (as specified in the tokenIn field OR the output token in src SwapDescription[]) before
        // sending to the bridge. This field is determined by the backend when searching for routes
        address wrappedBridgeToken;
        // a unique identifier that cBridge uses to dedup transfers
        // this value is the a timestamp sent from frontend, but in theory can be any unique number
        uint64 nonce;
    }

    function bridge(
        uint64 _dstChainId,
        address _receiver,
        uint256 _amount,
        address _token,
        bytes memory _bridgeParams,
        bytes memory _requestMessage
    ) external payable onlyMainContract returns (bytes memory bridgeResp) {
        CBridgeParams memory params = abi.decode((_bridgeParams), (CBridgeParams));
        IERC20(_token).safeTransferFrom(msg.sender, address(this), _amount);
        if (params.wrappedBridgeToken != address(0)) {
            address canonical = IIntermediaryOriginalToken(params.wrappedBridgeToken).canonical();
            require(canonical == _token, "canonical != _token");
            // non-standard implementation: actual token wrapping is done inside the token contract's
            // transferFrom(). Approving the wrapper token contract to pull the token we intend to
            // send so that when bridge contract calls wrapper.transferFrom() it automatically pulls
            // the original token from this contract, wraps it, then transfer the wrapper token from
            // this contract to bridge.
            IERC20(_token).safeApprove(params.wrappedBridgeToken, _amount);
            _token = params.wrappedBridgeToken;
        }
        bytes32 transferId = MessageSenderLib.sendMessageWithTransfer(
            _receiver,
            _token,
            _amount,
            _dstChainId,
            params.nonce,
            params.maxSlippage,
            _requestMessage,
            params.bridgeType,
            messageBus,
            msg.value
        );
        if (params.wrappedBridgeToken != address(0)) {
            IERC20(IIntermediaryOriginalToken(params.wrappedBridgeToken).canonical()).safeApprove(params.wrappedBridgeToken, 0);
        }
        return abi.encodePacked(transferId);
    }

    function updateMainContract(address _mainContract) external onlyOwner {
        mainContract = _mainContract;
        emit MainContractUpdated(_mainContract);
    }

    /**
     * @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
     * @dev Bridge contract *always* sends native token to its receiver (this contract) even though the _token field is always an ERC20 token
     * @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 returns (ExecutionStatus) {
        uint256 nativeAmt = 0;
        ITransferSwapper main = ITransferSwapper(mainContract);
        if (_token != main.nativeWrap()) {
            IERC20(_token).safeApprove(mainContract, _amount);
        } else {
            nativeAmt = _amount;
        }
        ExecutionStatus status = main.executeMessageWithTransferRefundFromAdapter{value: nativeAmt}(_token, _amount, _message, _executor);
        if (_token != main.nativeWrap()) {
            IERC20(_token).safeApprove(mainContract, 0);
        }
        return status;
    }
}

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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");
        }
    }
}

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



// 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);
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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);
    }
}

// File: contracts/lib/MessageSenderLib.sol



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

pragma solidity 0.8.15;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "../interfaces/IBridgeCeler.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);
            IBridgeCeler(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)));
    }
}

// File: contracts/lib/MessageReceiverApp.sol



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

pragma solidity 0.8.15;

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

abstract contract MessageReceiverApp is IMessageReceiverApp, MessageBusAddress {
    // testMode is used for the ease of testing functions with the "onlyMessageBus" modifier.
    // WARNING: when testMode is true, ANYONE can call executeMessageXXX functions
    // this variable can only be set during contract construction and is always not set on mainnets
    bool public testMode;

    modifier onlyMessageBus() {
        if (!testMode) {
            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) {}
}

// File: contracts/interfaces/IBridgeAdapter.sol



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

pragma solidity >=0.8.15;

interface IBridgeAdapter {
    function bridge(
        uint64 _dstChainId,
        // the address that the fund is transfered to on the destination chain
        address _receiver,
        uint256 _amount,
        address _token,
        // Bridge transfers quoted and abi encoded by chainhop backend server.
        // Bridge adapter implementations need to decode this themselves.
        bytes memory _bridgeParams,
        // The message to be bridged alongside the transfer.
        // Note if the bridge adapter doesn't support message passing, the call should revert when
        // this field is set.
        bytes memory _requestMessage
    ) external payable returns (bytes memory bridgeResp);
}

// File: contracts/interfaces/ITransferSwapper.sol



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

pragma solidity >=0.8.15;

import "./IMessageReceiverApp.sol";

interface ITransferSwapper {
    function nativeWrap() external view returns (address);

    /**
     * @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 executeMessageWithTransferRefundFromAdapter(
        address _token,
        uint256 _amount,
        bytes calldata _message,
        address _executor
    ) external payable returns (IMessageReceiverApp.ExecutionStatus);
}

// File: contracts/interfaces/IIntermediaryOriginalToken.sol



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

pragma solidity >=0.8.15;

interface IIntermediaryOriginalToken {
    function canonical() external view returns (address);
}

// File: @openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol



// 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);
}

// File: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



// 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;
    }
}

// File: contracts/interfaces/IBridgeCeler.sol



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

pragma solidity >=0.8.15;

interface IBridgeCeler {
    // common
    function delayThresholds(address token) external view returns (uint256);

    function delayPeriod() external view returns (uint256);

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

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

    // liquidity bridge
    function minSend(address token) external view returns (uint256);

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

    // peg vault v0/v2
    function minDeposit(address token) external view returns (uint256);

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

    // peg bridge v0/v2
    function minBurn(address token) external view returns (uint256);

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

    function nativeWrap() external view returns (address);

    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;
}

// File: contracts/interfaces/IOriginalTokenVault.sol



// 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);
}

// File: contracts/interfaces/IOriginalTokenVaultV2.sol



// 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);
}

// File: contracts/interfaces/IPeggedTokenBridge.sol



// 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);
}

// File: contracts/interfaces/IPeggedTokenBridgeV2.sol



// 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);
}

// File: contracts/interfaces/IMessageBus.sol



// 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);

    function feeBase() external view returns (uint256);

    function feePerByte() external view returns (uint256);

    /**
     * @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;
}

// File: contracts/lib/MsgDataTypes.sol



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

pragma solidity 0.8.15;

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;
    }
}

// File: contracts/interfaces/IMessageReceiverApp.sol



// 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);
}

// File: contracts/lib/MessageBusAddress.sol



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

pragma solidity 0.8.15;

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);
    }
}