处理取消授权通知

        :params msg: 加密内容
        :params signature: 消息签名
        :params timestamp: 时间戳
        :params nonce: 随机数

def get_unauthorized(self, msg, signature, timestamp, nonce):
        """
        处理取消授权通知

        :params msg: 加密内容
        :params signature: 消息签名
        :params timestamp: 时间戳
        :params nonce: 随机数
        """
        warnings.warn('`get_unauthorized` method of `WeChatComponent` is deprecated,'
                      'Use `parse_message` instead',
                      DeprecationWarning, stacklevel=2)
        content = self.crypto.decrypt_message(msg, signature, timestamp, nonce)
        message = xmltodict.parse(to_text(content))['xml']
        return ComponentUnauthorizedMessage(message)