hyperlane-monorepo/solidity/contracts/hooks/routing/DomainRoutingHook.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;

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// ============ Internal Imports ============
import {StandardHookMetadata} from "../libs/StandardHookMetadata.sol";
import {AbstractPostDispatchHook} from "../libs/AbstractPostDispatchHook.sol";
import {MailboxClient} from "../../client/MailboxClient.sol";
import {Message} from "../../libs/Message.sol";
import {IPostDispatchHook} from "../../interfaces/hooks/IPostDispatchHook.sol";

// ============ External Imports ============
import {Strings} from "@openzeppelin/contracts/utils/Strings.sol";

/**
 * @title DomainRoutingHook
 * @notice Delegates to a hook based on the destination domain of the message.
 */
contract DomainRoutingHook is AbstractPostDispatchHook, MailboxClient {
    using Strings for uint32;
    using Message for bytes;

    struct HookConfig {
        uint32 destination;
        address hook;
    }

    mapping(uint32 => IPostDispatchHook) public hooks;

    constructor(address _mailbox, address _owner) MailboxClient(_mailbox) {
        _transferOwnership(_owner);
    }

    function setHook(uint32 destination, address hook) public onlyOwner {
        hooks[destination] = IPostDispatchHook(hook);
    }

    function setHooks(HookConfig[] calldata configs) external onlyOwner {
        for (uint256 i = 0; i < configs.length; i++) {
            setHook(configs[i].destination, configs[i].hook);
        }
    }

    function supportsMetadata(bytes calldata)
        public
        pure
        virtual
        override
        returns (bool)
    {
        // routing hook does not care about metadata shape
        return true;
    }

    // ============ Internal Functions ============

    /// @inheritdoc AbstractPostDispatchHook
    function _postDispatch(bytes calldata metadata, bytes calldata message)
        internal
        virtual
        override
    {
        _getConfiguredHook(message).postDispatch{value: msg.value}(
            metadata,
            message
        );
    }

    /// @inheritdoc AbstractPostDispatchHook
    function _quoteDispatch(bytes calldata metadata, bytes calldata message)
        internal
        view
        virtual
        override
        returns (uint256)
    {
        return _getConfiguredHook(message).quoteDispatch(metadata, message);
    }

    function _getConfiguredHook(bytes calldata message)
        internal
        view
        virtual
        returns (IPostDispatchHook hook)
    {
        hook = hooks[message.destination()];
        require(
            address(hook) != address(0),
            string.concat(
                "No hook configured for destination: ",
                message.destination().toString()
            )
        );
    }
}