docs: def user_pass(self, func=None, location=None, **rkwargs):
          """Decorator ensures that user pass the given func."""
          def wrapper(view):
              view = to_coroutine(view)
  
              @functools.wraps(view)
              async def handler(request, *args, **kwargs):
                  await self.check_user(request, func, location, **rkwargs)
                  return await view(request, *args, **kwargs)
              return handler
  
          return wrapper