code: def start_auth(self, context, internal_request, get_state=stateID):
          
          oauth_state = get_state(self.config["base_url"], rndstr().encode())
  
          state_data = dict(state=oauth_state)
          context.state[self.name] = state_data
  
          request_args = {"redirect_uri": self.redirect_url, "state": oauth_state}
          cis = self.consumer.construct_AuthorizationRequest(request_args=request_args)
          return Redirect(cis.request(self.consumer.authorization_endpoint))
docs: See super class method satosa.backends.base#start_auth
          :param get_state: Generates a state to be used in the authentication call.
  
          :type get_state: Callable[[str, bytes], str]
          :type context: satosa.context.Context
          :type internal_request: satosa.internal.InternalData
          :rtype satosa.response.Redirect