{
    "Function": "_cancelAuthorization",
    "File": "contracts/v1/EIP3009.sol",
    "Parent Contracts": [
        "contracts/v1/EIP712Domain.sol",
        "contracts/v1/AbstractFiatTokenV1.sol",
        "contracts/util/IERC20.sol"
    ],
    "High-Level Calls": [
        "EIP712"
    ],
    "Internal Calls": [
        "_requireUnusedAuthorization",
        "_domainSeparatorV4",
        "require(bool,string)",
        "abi.encode()"
    ],
    "Library Calls": [
        "recover"
    ],
    "Low-Level Calls": [],
    "Code": "function _cancelAuthorization(\n        address authorizer,\n        bytes32 nonce,\n        uint8 v,\n        bytes32 r,\n        bytes32 s\n    ) internal {\n        _requireUnusedAuthorization(authorizer, nonce);\n\n        bytes memory data = abi.encode(\n            CANCEL_AUTHORIZATION_TYPEHASH,\n            authorizer,\n            nonce\n        );\n        require(\n            EIP712.recover(_domainSeparatorV4(), v, r, s, data) == authorizer,\n            \"EIP3009: invalid signature\"\n        );\n\n        _authorizationStates[authorizer][nonce] = true;\n        emit AuthorizationCanceled(authorizer, nonce);\n    }"
}