hyperlane-monorepo/solidity/contracts/isms/TrustedRelayerIsm.sol

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.8.0;

// ============ Internal Imports ============
import {IInterchainSecurityModule} from "../interfaces/IInterchainSecurityModule.sol";
import {Address} from "@openzeppelin/contracts/utils/Address.sol";
import {Message} from "../libs/Message.sol";
import {Mailbox} from "../Mailbox.sol";
import {PackageVersioned} from "contracts/PackageVersioned.sol";

contract TrustedRelayerIsm is IInterchainSecurityModule, PackageVersioned {
    using Message for bytes;

    uint8 public immutable moduleType = uint8(Types.NULL);
    Mailbox public immutable mailbox;
    address public immutable trustedRelayer;

    constructor(address _mailbox, address _trustedRelayer) {
        require(
            _trustedRelayer != address(0),
            "TrustedRelayerIsm: invalid relayer"
        );
        require(
            Address.isContract(_mailbox),
            "TrustedRelayerIsm: invalid mailbox"
        );
        mailbox = Mailbox(_mailbox);
        trustedRelayer = _trustedRelayer;
    }

    function verify(
        bytes calldata,
        bytes calldata message
    ) external view returns (bool) {
        return mailbox.processor(message.id()) == trustedRelayer;
    }
}