Function check_credentials

src/websockets/sync/server.py:714–719

(username: str, password: str)

        credentials_dict = dict(credentials_list)

        def check_credentials(username: str, password: str) -> bool:
            try:
                expected_password = credentials_dict[username]
            except KeyError:
                return False
            return hmac.compare_digest(expected_password, password)

    assert check_credentials is not None  # help mypy