code: def auth_required(func):
      
      @wraps(func)
      async def wrapper(*args):
          if (await get_auth(args[-1])) is None:
              raise web.HTTPForbidden()
  
          return await func(*args)
  
      return wrapper
docs: Utility decorator that checks if a user has been authenticated for this
      request.
  
      Allows views to be decorated like:
  
          @auth_required
          def view_func(request):
              pass
  
      providing a simple means to ensure that whoever is calling the function has
      the correct authentication details.
  
      Args:
          func: Function object being decorated and raises HTTPForbidden if not
  
      Returns:
          A function object that will raise web.HTTPForbidden() if the passed
          request does not have the correct permissions to access the view.