protocol.py 文件源码

def handshake_cookie_verify(b64_cookie):
        '''
        If b64_cookie matches the expected format for a base-64 encoded
        privcount cookie, return the decoded cookie.
        Otherwise, return False.
        Raises an exception if the cookie is not correctly padded base64.
        '''
        if len(b64_cookie) != PrivCountProtocol.COOKIE_B64_BYTES:
            logging.warning("Invalid cookie: wrong encoded length {} expected {}"
                            .format(len(b64_cookie),
                                    PrivCountProtocol.COOKIE_B64_BYTES))
            return False
        cookie = b64decode(b64_cookie)
        if len(cookie) != PrivCountProtocol.COOKIE_BYTES:
            logging.warning("Invalid cookie: wrong decoded length {} expected {}"
                            .format(len(cookie),
                                    PrivCountProtocol.COOKIE_BYTES))
            return False
        return cookie