tornado Persona auth handler

tornado_persona_auth.py

class PersonaAuthHandler(BaseHandler):

   @tornado.web.asynchronous
   def post(self):
       assertion = self.get_argument('assertion')
       http_client = tornado.httpclient.AsyncHTTPClient()
       domain = 'localhost'  # MAKE SURE YOU CHANGE THIS
       url = 'https://browserid.org/verify'
       data = {
         'assertion': assertion,
         'audience': domain,
       }
       response = http_client.fetch(
         url,
         method='POST',
         body=urllib.urlencode(data),
         callback=self.async_callback(self._on_response)
       )

   def _on_response(self, response):
        data = tornado.escape.json_decode(response.body)
        if data['status'] != 'okay':
            raise tornado.web.HTTPError(400, "Failed assertion test")
        email = data['email']
        user, _created = User.objects.get_or_create(email=email)
        self.set_secure_cookie('user', tornado.escape.json_encode(user.as_dict()))
        self.finish()