code: def init_app(self, app):
          
  
          app.config.setdefault('RBAC_USE_WHITE', False)
          self.use_white = app.config['RBAC_USE_WHITE']
  
          if not hasattr(app, 'extensions'):
              app.extensions = {}
          app.extensions['rbac'] = _RBACState(self, app)
  
          self.acl.allow(anonymous, 'GET', 'static')
          app.before_first_request(self._setup_acl)
  
          app.before_request(self._authenticate)
docs: Initialize application in Flask-RBAC.
          Adds (RBAC, app) to flask extensions.
          Adds hook to authenticate permission before request.
  
          :param app: Flask object