AllowedMethodsEnforcer.sol

//SPDX-License-Identifier: MIT
pragma solidity 0.8.15;

import "../CaveatEnforcer.sol";

contract AllowedMethodsEnforcer is CaveatEnforcer {
    /**
     * @notice Allows the delegator to limit what methods the delegate may call.
     * @param terms - A series of 4byte method identifiers, representing the methods that the delegate is allowed to call.
     * @param transaction - The transaction the delegate might try to perform.
     * @param delegationHash - The hash of the delegation being operated on.
     */
    function enforceCaveat(
        bytes calldata terms,
        Transaction calldata transaction,
        bytes32 delegationHash
    ) public pure override returns (bool) {
        bytes4 targetSig = bytes4(transaction.data[0:4]);
        for (uint256 i = 0; i < terms.length; i += 4) {
            bytes4 allowedSig = bytes4(terms[i:i + 4]);
            if (allowedSig == targetSig) {
                return true;
            }
        }
        revert("AllowedMethodsEnforcer:method-not-allowed");
    }
}