utils.py 文件源码

def get_identifier(self):
        """ Gets the instance, if token is valid.

        :param klass: the class (must be model.Model instance)
        May throw DoesNotExist
        :returns: instance if signature is ok, None else.
        """
        try:
            payload = signing.Signer().unsign(self.token)
        except signing.BadSignature:
            return None
        else:
            d = json.loads(force_text(urlsafe_base64_decode(payload)))
            return d.get('identifier')