Contract 0x882aDEa1A3b875FC776caC94541cCb1275C38654

// SPDX-FileCopyrightText: 2021 Toucan Labs
//
// SPDX-License-Identifier: UNLICENSED

// If you encounter a vulnerability or an issue, please contact <[email protected]> or visit security.toucan.earth
pragma solidity >=0.8.4 <=0.8.14;

import {Router} from '@abacus-network/app/contracts/Router.sol';
import {PausableUpgradeable} from '@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol';
import {UUPSUpgradeable} from '@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol';
import './ToucanCrosschainMessengerStorage.sol';
import './interfaces/IBridgeableToken.sol';

contract ToucanCrosschainMessenger is
    PausableUpgradeable,
    Router,
    UUPSUpgradeable,
    ToucanCrosschainMessengerStorage
{
    // ============ Constants ============

    string public constant VERSION = '1.0.0';
    uint256 public constant TIMER = 1209600; // 14 Days

    // ============ Events ============

    event BridgeRequestReceived(
        uint32 indexed originDomain,
        uint32 toDomain,
        address indexed bridger,
        address indexed token,
        uint256 amount,
        bytes32 requesthash
    );
    event BridgeRequestSent(
        uint32 originDomain,
        uint32 indexed toDomain,
        address indexed bridger,
        address indexed token,
        uint256 amount,
        uint256 nonce,
        bytes32 requesthash
    );

    event TokenPairAdded(
        address indexed homeTokenAddress,
        address indexed remoteTokenAddress,
        uint32 domainId
    );

    // ============ Constructor ============

    function initialize(address _abacusConnectionManager)
        external
        virtual
        initializer
    {
        __Router_initialize(_abacusConnectionManager);
        __Pausable_init();
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256(
                    'EIP712Domain(string name,string version,uint256 chainId)'
                ),
                'ToucanCrosschainMessenger',
                VERSION,
                block.chainid
            )
        );
    }

    /**
     * @notice Adds new token pair than can be bridged
     * @dev Called by owner to add or map home token address to remote token address.
     * Changing the remote token address can only be done within a 7 day period, after first
     * setting it.
     * @param _homeToken token address on home chain
     * @param _remoteToken token address on remote chain
     * @param _domain domain ID of the remote chain whose token is being mapped
     */
    function addTokenPair(
        address _homeToken,
        address _remoteToken,
        uint32 _domain
    ) external onlyOwner {
        require(
            _homeToken != address(0) && _remoteToken != address(0),
            '!_homeToken || !_remoteTokens'
        );
        if (remoteTokens[_homeToken][_domain].timer != 0) {
            require(
                (block.timestamp - remoteTokens[_homeToken][_domain].timer) <
                    TIMER,
                'timer expired'
            );
        }
        remoteTokens[_homeToken][_domain] = RemoteTokenInformation(
            _remoteToken,
            block.timestamp
        );
        emit TokenPairAdded(_homeToken, _remoteToken, _domain);
    }

    /**
     * @notice Pauses the cross chain bridge
     * @dev when invoked by owner it Pauses the cross chain bridging logic to interact with abacus
     */
    function pause() external onlyOwner whenNotPaused {
        _pause();
    }

    /**
     * @notice Unpauses the cross chain bridge
     * @dev when invoked by owner it unpauses the cross chain bridging logic to interact with abacus
     */
    function unpause() external onlyOwner whenPaused {
        _unpause();
    }

    // ============ Handle message functions ============

    /**
     * @notice Receive messages sent via Abacus from other remote Routers;
     * parse the contents of the message and enact the message's effects on the local chain
     * @dev it is internally invoked via handle() which is invoked by Abacus's inbox
     * @param _origin The domain the message is coming from
     * @param _message The message in the form of raw bytes
     */
    function _handle(
        uint32 _origin,
        bytes32, // _sender, // commented out because parameter not used
        bytes memory _message
    ) internal virtual override whenNotPaused {
        // currently only one message type supported, i.e. mint type
        (
            uint8 messageType,
            address receiver,
            address token,
            uint256 amount,
            uint32 toDomain,
            bytes32 requestHash
        ) = abi.decode(
                _message,
                (uint8, address, address, uint256, uint32, bytes32)
            );
        require(
            requests[requestHash].requestType ==
                BridgeRequestType.NOT_REGISTERED,
            'Bridge Request Executed'
        );
        requests[requestHash] = BridgeRequest(
            false,
            block.timestamp, // timestamp when the bridge request was received
            BridgeRequestType.RECEIVED,
            MessageTypes(messageType)
        );
        if (MessageTypes(messageType) == MessageTypes.MINT) {
            IBridgeableToken(token).bridgeMint(receiver, amount);
            emit BridgeRequestReceived(
                _origin,
                toDomain,
                receiver,
                token,
                amount,
                requestHash
            );
        } else {
            revert('Unsopported Operation');
        }
    }

    // ============ Dispatch message functions ============

    /**
     * @notice Send a message of "Type A" to a remote xApp Router via Abacus;
     * this message is called to take some action in the cross-chain context
     * @param _destinationDomain The domain to send the message to
     * @param _token address of token to be bridged
     * @param _amount the amount of tokens to be bridged
     */
    function sendMessage(
        uint32 _destinationDomain,
        address _token,
        uint256 _amount
    ) external payable whenNotPaused {
        require(
            remoteTokens[_token][_destinationDomain].tokenAddress != address(0),
            'remote token not mapped'
        );
        uint256 currentNonce = nonce;
        unchecked {
            ++currentNonce;
        }
        nonce = currentNonce;
        bytes32 requestHash = _generateRequestHash(
            msg.sender,
            _token,
            _amount,
            _destinationDomain,
            currentNonce
        );
        // encode a message to send to the remote xApp Router
        address remoteToken = remoteTokens[_token][_destinationDomain]
            .tokenAddress;
        requests[requestHash] = BridgeRequest(
            false,
            block.timestamp, // timestamp when the bridge request was sent
            BridgeRequestType.SENT,
            MessageTypes.MINT
        );
        bytes memory _outboundMessage = abi.encode(
            MessageTypes.MINT,
            msg.sender,
            remoteToken,
            _amount,
            _destinationDomain,
            requestHash
        );
        // Dispatch Message
        // Pay Gas for processing message
        // And create a checkpoint so message can be processed
        _dispatchWithGas(_destinationDomain, _outboundMessage, msg.value);
        IBridgeableToken(_token).bridgeBurn(msg.sender, _amount);
        emit BridgeRequestSent(
            _localDomain(),
            _destinationDomain,
            msg.sender,
            _token,
            _amount,
            currentNonce,
            requestHash
        );
    }

    function _generateRequestHash(
        address _receiver,
        address _token,
        uint256 _amount,
        uint32 _destinationDomain,
        uint256 _nonce
    ) internal view returns (bytes32 _requestHash) {
        return
            keccak256(
                abi.encodePacked(
                    DOMAIN_SEPARATOR,
                    _receiver,
                    _token,
                    _amount,
                    _destinationDomain,
                    _nonce
                )
            );
    }

    function _authorizeUpgrade(address newImplementation)
        internal
        virtual
        override
        onlyOwner
    {}
}

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.6.11;

// ============ Internal Imports ============
import {AbacusConnectionClient} from "./AbacusConnectionClient.sol";
import {IAbacusConnectionManager} from "@abacus-network/core/interfaces/IAbacusConnectionManager.sol";
import {IInterchainGasPaymaster} from "@abacus-network/core/interfaces/IInterchainGasPaymaster.sol";
import {IMessageRecipient} from "@abacus-network/core/interfaces/IMessageRecipient.sol";
import {IOutbox} from "@abacus-network/core/interfaces/IOutbox.sol";

abstract contract Router is AbacusConnectionClient, IMessageRecipient {
    // ============ Mutable Storage ============

    mapping(uint32 => bytes32) public routers;
    uint256[49] private __GAP; // gap for upgrade safety

    // ============ Events ============

    /**
     * @notice Emitted when a router is set.
     * @param domain The domain of the new router
     * @param router The address of the new router
     */
    event RemoteRouterEnrolled(uint32 indexed domain, bytes32 indexed router);

    // ============ Modifiers ============
    /**
     * @notice Only accept messages from a remote Router contract
     * @param _origin The domain the message is coming from
     * @param _router The address the message is coming from
     */
    modifier onlyRemoteRouter(uint32 _origin, bytes32 _router) {
        require(_isRemoteRouter(_origin, _router), "!router");
        _;
    }

    // ======== Initializer =========
    function __Router_initialize(address _abacusConnectionManager)
        internal
        onlyInitializing
    {
        __AbacusConnectionClient_initialize(_abacusConnectionManager);
    }

    function __Router_initialize(
        address _abacusConnectionManager,
        address _interchainGasPaymaster
    ) internal onlyInitializing {
        __AbacusConnectionClient_initialize(
            _abacusConnectionManager,
            _interchainGasPaymaster
        );
    }

    // ============ External functions ============

    /**
     * @notice Register the address of a Router contract for the same Application on a remote chain
     * @param _domain The domain of the remote Application Router
     * @param _router The address of the remote Application Router
     */
    function enrollRemoteRouter(uint32 _domain, bytes32 _router)
        external
        virtual
        onlyOwner
    {
        _enrollRemoteRouter(_domain, _router);
    }

    /**
     * @notice Handles an incoming message
     * @param _origin The origin domain
     * @param _sender The sender address
     * @param _message The message
     */
    function handle(
        uint32 _origin,
        bytes32 _sender,
        bytes memory _message
    ) external virtual override onlyInbox onlyRemoteRouter(_origin, _sender) {
        // TODO: callbacks on success/failure
        _handle(_origin, _sender, _message);
    }

    // ============ Virtual functions ============
    function _handle(
        uint32 _origin,
        bytes32 _sender,
        bytes memory _message
    ) internal virtual;

    // ============ Internal functions ============

    /**
     * @notice Set the router for a given domain
     * @param _domain The domain
     * @param _router The new router
     */
    function _enrollRemoteRouter(uint32 _domain, bytes32 _router) internal {
        routers[_domain] = _router;
        emit RemoteRouterEnrolled(_domain, _router);
    }

    /**
     * @notice Return true if the given domain / router is the address of a remote Application Router
     * @param _domain The domain of the potential remote Application Router
     * @param _router The address of the potential remote Application Router
     */
    function _isRemoteRouter(uint32 _domain, bytes32 _router)
        internal
        view
        returns (bool)
    {
        return routers[_domain] == _router;
    }

    /**
     * @notice Assert that the given domain has a Application Router registered and return its address
     * @param _domain The domain of the chain for which to get the Application Router
     * @return _router The address of the remote Application Router on _domain
     */
    function _mustHaveRemoteRouter(uint32 _domain)
        internal
        view
        returns (bytes32 _router)
    {
        _router = routers[_domain];
        require(_router != bytes32(0), "!router");
    }

    /**
     * @notice Dispatches a message to an enrolled router via the local router's Outbox.
     * @notice Does not pay interchain gas.
     * @dev Reverts if there is no enrolled router for _destinationDomain.
     * @param _destinationDomain The domain of the chain to which to send the message.
     * @param _msg The message to dispatch.
     */
    function _dispatch(uint32 _destinationDomain, bytes memory _msg)
        internal
        returns (uint256)
    {
        return _dispatch(_outbox(), _destinationDomain, _msg);
    }

    /**
     * @notice Dispatches a message to an enrolled router via the local router's Outbox
     * and pays for it to be relayed to the destination.
     * @dev Reverts if there is no enrolled router for _destinationDomain.
     * @param _destinationDomain The domain of the chain to which to send the message.
     * @param _msg The message to dispatch.
     * @param _gasPayment The amount of native tokens to pay for the message to be relayed.
     */
    function _dispatchWithGas(
        uint32 _destinationDomain,
        bytes memory _msg,
        uint256 _gasPayment
    ) internal {
        IOutbox _outbox = _outbox();
        uint256 _leafIndex = _dispatch(_outbox, _destinationDomain, _msg);
        if (_gasPayment > 0) {
            interchainGasPaymaster.payGasFor{value: _gasPayment}(
                address(_outbox),
                _leafIndex,
                _destinationDomain
            );
        }
    }

    // ============ Private functions ============

    /**
     * @notice Dispatches a message to an enrolled router via the provided Outbox.
     * @dev Does not pay interchain gas.
     * @dev Reverts if there is no enrolled router for _destinationDomain.
     * @param _outbox The outbox contract to dispatch the message through.
     * @param _destinationDomain The domain of the chain to which to send the message.
     * @param _msg The message to dispatch.
     */
    function _dispatch(
        IOutbox _outbox,
        uint32 _destinationDomain,
        bytes memory _msg
    ) private returns (uint256) {
        // Ensure that destination chain has an enrolled router.
        bytes32 _router = _mustHaveRemoteRouter(_destinationDomain);
        return _outbox.dispatch(_destinationDomain, _router, _msg);
    }
}

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

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract PausableUpgradeable is Initializable, ContextUpgradeable {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    function __Pausable_init() internal onlyInitializing {
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal onlyInitializing {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

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

pragma solidity ^0.8.0;

import "../../interfaces/draft-IERC1822Upgradeable.sol";
import "../ERC1967/ERC1967UpgradeUpgradeable.sol";
import "./Initializable.sol";

/**
 * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
 * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
 *
 * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
 * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
 * `UUPSUpgradeable` with a custom implementation of upgrades.
 *
 * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
 *
 * _Available since v4.1._
 */
abstract contract UUPSUpgradeable is Initializable, IERC1822ProxiableUpgradeable, ERC1967UpgradeUpgradeable {
    function __UUPSUpgradeable_init() internal onlyInitializing {
    }

    function __UUPSUpgradeable_init_unchained() internal onlyInitializing {
    }
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
    address private immutable __self = address(this);

    /**
     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
     * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
     * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
     * fail.
     */
    modifier onlyProxy() {
        require(address(this) != __self, "Function must be called through delegatecall");
        require(_getImplementation() == __self, "Function must be called through active proxy");
        _;
    }

    /**
     * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
     * callable on the implementing contract but not through proxies.
     */
    modifier notDelegated() {
        require(address(this) == __self, "UUPSUpgradeable: must not be called through delegatecall");
        _;
    }

    /**
     * @dev Implementation of the ERC1822 {proxiableUUID} function. This returns the storage slot used by the
     * implementation. It is used to validate that the this implementation remains valid after an upgrade.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy. This is guaranteed by the `notDelegated` modifier.
     */
    function proxiableUUID() external view virtual override notDelegated returns (bytes32) {
        return _IMPLEMENTATION_SLOT;
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeTo(address newImplementation) external virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, new bytes(0), false);
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
     * encoded in `data`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, data, true);
    }

    /**
     * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
     * {upgradeTo} and {upgradeToAndCall}.
     *
     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
     *
     * ```solidity
     * function _authorizeUpgrade(address) internal override onlyOwner {}
     * ```
     */
    function _authorizeUpgrade(address newImplementation) internal virtual;

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-FileCopyrightText: 2021 Toucan Labs
//
// SPDX-License-Identifier: UNLICENSED

// If you encounter a vulnerability or an issue, please contact <[email protected]> or visit security.toucan.earthz
pragma solidity >=0.8.4 <=0.8.14;

/// @dev Separate storage contract to improve upgrade safety
contract ToucanCrosschainMessengerStorage {
    enum BridgeRequestType {
        NOT_REGISTERED, // 0
        SENT, // 1
        RECEIVED // 2
    }

    enum MessageTypes {
        MINT
    }

    struct BridgeRequest {
        bool isReverted; // this state is added for future addition of revert functionality
        uint256 timestamp;
        BridgeRequestType requestType;
        MessageTypes messageType;
    }
    
    struct RemoteTokenInformation {
        address tokenAddress;
        uint256 timer;
    }
    uint256 public nonce;
    bytes32 public DOMAIN_SEPARATOR;
    mapping(bytes32 => BridgeRequest) public requests;
    mapping(address => mapping(uint32 => RemoteTokenInformation))
        public remoteTokens;
}

// SPDX-FileCopyrightText: 2021 Toucan Labs
//
// SPDX-License-Identifier: UNLICENSED

// If you encounter a vulnerability or an issue, please contact <[email protected]> or visit security.toucan.earth
pragma solidity ^0.8.0;

interface IBridgeableToken {
    function bridgeMint(address _account, uint256 _amount) external;

    function bridgeBurn(address _account, uint256 _amount) external;
}

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.6.11;

// ============ Internal Imports ============
import {IInterchainGasPaymaster} from "@abacus-network/core/interfaces/IInterchainGasPaymaster.sol";
import {IOutbox} from "@abacus-network/core/interfaces/IOutbox.sol";
import {IAbacusConnectionManager} from "@abacus-network/core/interfaces/IAbacusConnectionManager.sol";

// ============ External Imports ============
import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

abstract contract AbacusConnectionClient is OwnableUpgradeable {
    // ============ Mutable Storage ============

    IAbacusConnectionManager public abacusConnectionManager;
    // Interchain Gas Paymaster contract. The relayer associated with this contract
    // must be willing to relay messages dispatched from the current Outbox contract,
    // otherwise payments made to the paymaster will not result in relayed messages.
    IInterchainGasPaymaster public interchainGasPaymaster;

    uint256[48] private __GAP; // gap for upgrade safety

    // ============ Events ============

    /**
     * @notice Emitted when a new abacusConnectionManager is set.
     * @param abacusConnectionManager The address of the abacusConnectionManager contract
     */
    event AbacusConnectionManagerSet(address indexed abacusConnectionManager);

    /**
     * @notice Emitted when a new Interchain Gas Paymaster is set.
     * @param interchainGasPaymaster The address of the Interchain Gas Paymaster.
     */
    event InterchainGasPaymasterSet(address indexed interchainGasPaymaster);

    // ============ Modifiers ============

    /**
     * @notice Only accept messages from an Abacus Inbox contract
     */
    modifier onlyInbox() {
        require(_isInbox(msg.sender), "!inbox");
        _;
    }

    // ======== Initializer =========

    function __AbacusConnectionClient_initialize(
        address _abacusConnectionManager
    ) internal onlyInitializing {
        _setAbacusConnectionManager(_abacusConnectionManager);
        __Ownable_init();
    }

    function __AbacusConnectionClient_initialize(
        address _abacusConnectionManager,
        address _interchainGasPaymaster
    ) internal onlyInitializing {
        _setInterchainGasPaymaster(_interchainGasPaymaster);
        __AbacusConnectionClient_initialize(_abacusConnectionManager);
    }

    // ============ External functions ============

    /**
     * @notice Sets the address of the application's AbacusConnectionManager.
     * @param _abacusConnectionManager The address of the AbacusConnectionManager contract.
     */
    function setAbacusConnectionManager(address _abacusConnectionManager)
        external
        virtual
        onlyOwner
    {
        _setAbacusConnectionManager(_abacusConnectionManager);
    }

    /**
     * @notice Sets the address of the application's InterchainGasPaymaster.
     * @param _interchainGasPaymaster The address of the InterchainGasPaymaster contract.
     */
    function setInterchainGasPaymaster(address _interchainGasPaymaster)
        external
        virtual
        onlyOwner
    {
        _setInterchainGasPaymaster(_interchainGasPaymaster);
    }

    // ============ Internal functions ============

    /**
     * @notice Sets the address of the application's InterchainGasPaymaster.
     * @param _interchainGasPaymaster The address of the InterchainGasPaymaster contract.
     */
    function _setInterchainGasPaymaster(address _interchainGasPaymaster)
        internal
    {
        interchainGasPaymaster = IInterchainGasPaymaster(
            _interchainGasPaymaster
        );
        emit InterchainGasPaymasterSet(_interchainGasPaymaster);
    }

    /**
     * @notice Modify the contract the Application uses to validate Inbox contracts
     * @param _abacusConnectionManager The address of the abacusConnectionManager contract
     */
    function _setAbacusConnectionManager(address _abacusConnectionManager)
        internal
    {
        abacusConnectionManager = IAbacusConnectionManager(
            _abacusConnectionManager
        );
        emit AbacusConnectionManagerSet(_abacusConnectionManager);
    }

    /**
     * @notice Get the local Outbox contract from the abacusConnectionManager
     * @return The local Outbox contract
     */
    function _outbox() internal view returns (IOutbox) {
        return abacusConnectionManager.outbox();
    }

    /**
     * @notice Determine whether _potentialInbox is an enrolled Inbox from the abacusConnectionManager
     * @return True if _potentialInbox is an enrolled Inbox
     */
    function _isInbox(address _potentialInbox) internal view returns (bool) {
        return abacusConnectionManager.isInbox(_potentialInbox);
    }

    /**
     * @notice Get the local domain from the abacusConnectionManager
     * @return The local domain
     */
    function _localDomain() internal view virtual returns (uint32) {
        return abacusConnectionManager.localDomain();
    }
}

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.6.11;

import {IOutbox} from "./IOutbox.sol";

interface IAbacusConnectionManager {
    function outbox() external view returns (IOutbox);

    function isInbox(address _inbox) external view returns (bool);

    function localDomain() external view returns (uint32);
}

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.6.11;

/**
 * @title IInterchainGasPaymaster
 * @notice Manages payments on a source chain to cover gas costs of relaying
 * messages to destination chains.
 */
interface IInterchainGasPaymaster {
    function payGasFor(
        address _outbox,
        uint256 _leafIndex,
        uint32 _destinationDomain
    ) external payable;
}

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.6.11;

interface IMessageRecipient {
    function handle(
        uint32 _origin,
        bytes32 _sender,
        bytes calldata _message
    ) external;
}

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.6.11;

import {IMailbox} from "./IMailbox.sol";

interface IOutbox is IMailbox {
    function dispatch(
        uint32 _destinationDomain,
        bytes32 _recipientAddress,
        bytes calldata _messageBody
    ) external returns (uint256);

    function cacheCheckpoint() external;

    function latestCheckpoint() external view returns (bytes32, uint256);

    function count() external returns (uint256);

    function fail() external;

    function cachedCheckpoints(bytes32) external view returns (uint256);

    function latestCachedCheckpoint()
        external
        view
        returns (bytes32 root, uint256 index);
}

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

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

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

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

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

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

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

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.6.11;

interface IMailbox {
    function localDomain() external view returns (uint32);
}

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

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts. Equivalent to `reinitializer(1)`.
     */
    modifier initializer() {
        bool isTopLevelCall = _setInitializedVersion(1);
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * `initializer` is equivalent to `reinitializer(1)`, so a reinitializer may be used after the original
     * initialization step. This is essential to configure modules that are added through upgrades and that require
     * initialization.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     */
    modifier reinitializer(uint8 version) {
        bool isTopLevelCall = _setInitializedVersion(version);
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(version);
        }
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     */
    function _disableInitializers() internal virtual {
        _setInitializedVersion(type(uint8).max);
    }

    function _setInitializedVersion(uint8 version) private returns (bool) {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, and for the lowest level
        // of initializers, because in other contexts the contract may have been reentered.
        if (_initializing) {
            require(
                version == 1 && !AddressUpgradeable.isContract(address(this)),
                "Initializable: contract is already initialized"
            );
            return false;
        } else {
            require(_initialized < version, "Initializable: contract is already initialized");
            _initialized = version;
            return true;
        }
    }
}

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

pragma solidity ^0.8.1;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822ProxiableUpgradeable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (proxy/ERC1967/ERC1967Upgrade.sol)

pragma solidity ^0.8.2;

import "../beacon/IBeaconUpgradeable.sol";
import "../../interfaces/draft-IERC1822Upgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/StorageSlotUpgradeable.sol";
import "../utils/Initializable.sol";

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967UpgradeUpgradeable is Initializable {
    function __ERC1967Upgrade_init() internal onlyInitializing {
    }

    function __ERC1967Upgrade_init_unchained() internal onlyInitializing {
    }
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(AddressUpgradeable.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            _functionDelegateCall(newImplementation, data);
        }
    }

    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlotUpgradeable.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822ProxiableUpgradeable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);

    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(AddressUpgradeable.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            AddressUpgradeable.isContract(IBeaconUpgradeable(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }

    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            _functionDelegateCall(IBeaconUpgradeable(newBeacon).implementation(), data);
        }
    }

    /**
     * @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) private returns (bytes memory) {
        require(AddressUpgradeable.isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return AddressUpgradeable.verifyCallResult(success, returndata, "Address: low-level delegate call failed");
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeaconUpgradeable {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

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

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlotUpgradeable {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        assembly {
            r.slot := slot
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"abacusConnectionManager","type":"address"}],"name":"AbacusConnectionManagerSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"previousAdmin","type":"address"},{"indexed":false,"internalType":"address","name":"newAdmin","type":"address"}],"name":"AdminChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"beacon","type":"address"}],"name":"BeaconUpgraded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint32","name":"originDomain","type":"uint32"},{"indexed":false,"internalType":"uint32","name":"toDomain","type":"uint32"},{"indexed":true,"internalType":"address","name":"bridger","type":"address"},{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"requesthash","type":"bytes32"}],"name":"BridgeRequestReceived","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint32","name":"originDomain","type":"uint32"},{"indexed":true,"internalType":"uint32","name":"toDomain","type":"uint32"},{"indexed":true,"internalType":"address","name":"bridger","type":"address"},{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"nonce","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"requesthash","type":"bytes32"}],"name":"BridgeRequestSent","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint8","name":"version","type":"uint8"}],"name":"Initialized","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"interchainGasPaymaster","type":"address"}],"name":"InterchainGasPaymasterSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint32","name":"domain","type":"uint32"},{"indexed":true,"internalType":"bytes32","name":"router","type":"bytes32"}],"name":"RemoteRouterEnrolled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"homeTokenAddress","type":"address"},{"indexed":true,"internalType":"address","name":"remoteTokenAddress","type":"address"},{"indexed":false,"internalType":"uint32","name":"domainId","type":"uint32"}],"name":"TokenPairAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"}],"name":"Upgraded","type":"event"},{"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TIMER","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"VERSION","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"abacusConnectionManager","outputs":[{"internalType":"contract IAbacusConnectionManager","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_homeToken","type":"address"},{"internalType":"address","name":"_remoteToken","type":"address"},{"internalType":"uint32","name":"_domain","type":"uint32"}],"name":"addTokenPair","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_domain","type":"uint32"},{"internalType":"bytes32","name":"_router","type":"bytes32"}],"name":"enrollRemoteRouter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_origin","type":"uint32"},{"internalType":"bytes32","name":"_sender","type":"bytes32"},{"internalType":"bytes","name":"_message","type":"bytes"}],"name":"handle","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_abacusConnectionManager","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"interchainGasPaymaster","outputs":[{"internalType":"contract IInterchainGasPaymaster","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nonce","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"proxiableUUID","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint32","name":"","type":"uint32"}],"name":"remoteTokens","outputs":[{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"timer","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"requests","outputs":[{"internalType":"bool","name":"isReverted","type":"bool"},{"internalType":"uint256","name":"timestamp","type":"uint256"},{"internalType":"enum ToucanCrosschainMessengerStorage.BridgeRequestType","name":"requestType","type":"uint8"},{"internalType":"enum ToucanCrosschainMessengerStorage.MessageTypes","name":"messageType","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32","name":"","type":"uint32"}],"name":"routers","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32","name":"_destinationDomain","type":"uint32"},{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"sendMessage","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_abacusConnectionManager","type":"address"}],"name":"setAbacusConnectionManager","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_interchainGasPaymaster","type":"address"}],"name":"setInterchainGasPaymaster","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"}],"name":"upgradeTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"upgradeToAndCall","outputs":[],"stateMutability":"payable","type":"function"}]

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