{
    "Function": "_requireValidAuthorization",
    "File": "contracts/v1/EIP3009.sol",
    "Parent Contracts": [
        "contracts/v1/EIP712Domain.sol",
        "contracts/v1/AbstractFiatTokenV1.sol",
        "contracts/util/IERC20.sol"
    ],
    "High-Level Calls": [],
    "Internal Calls": [
        "require(bool,string)",
        "_requireUnusedAuthorization",
        "require(bool,string)"
    ],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "function _requireValidAuthorization(\n        address authorizer,\n        bytes32 nonce,\n        uint256 validAfter,\n        uint256 validBefore\n    ) private view {\n        require(\n            block.timestamp > validAfter,\n            \"FEIP3009: authorization is not yet valid\"\n        );\n        require(\n            block.timestamp < validBefore,\n            \"EIP3009: authorization is expired\"\n        );\n        _requireUnusedAuthorization(authorizer, nonce);\n    }"
}