code: def r_oauth_authorized(self):
          
          resp = self.authobj.authorized_response()
          if resp is None:
              return 'Access denied: reason=%s error=%s' % (
                  request.args['error'],
                  request.args['error_description']
              )
          session['oauth_token'] = (resp['access_token'], '')
          user = self.authobj.get('user')
          ## TODO this is too specific to Perseids' api model. We should externalize.
          session['oauth_user_uri'] = user.data['user']['uri']
          session['oauth_user_name'] = user.data['user']['full_name']
          if 'next' in session and session['next'] is not None:
              return redirect(session['next'])
          else:
              return {
                  "template": "nemo_oauth_plugin::authorized.html",
                  "username": session['oauth_user_name']
              }
docs: Route for OAuth2 Authorization callback
          :return: {"template"}