hyperlane-monorepo/solidity/contracts/interfaces/isms/IRoutingIsm.sol

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

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

interface IRoutingIsm is IInterchainSecurityModule {
    /**
     * @notice Returns the ISM responsible for verifying _message
     * @dev Can change based on the content of _message
     * @param _message Formatted Hyperlane message (see Message.sol).
     * @return module The ISM to use to verify _message
     */
    function route(
        bytes calldata _message
    ) external view returns (IInterchainSecurityModule);
}