human
Solve the following python programming problem given the following code:
def authorized(validator) : 
    'Decorate a RequestHandler or method to require that a request is authorized

    If decorating a coroutine make sure coroutine decorator is first.
    eg.::

        class Handler(tornado.web.RequestHandler):

            @authorized(validator)
            @coroutine
            def get(self):
                pass

    :param validator: a coroutine that will authorize the user associated with the token and return True/False
    ' 
    def _authorized_decorator(method) : 
        @ gen.coroutine 
        def wrapper(self, * args, **kwargs) : 
            token = _get_token (self.request) 
            authorized = (yield validator (token, ** kwargs)) 
            if (not authorized) : 
                message = 'Token is not authorised for this action: {}'.format (token) 
                logging.warning (message) 
                raise HTTPError (403, message) 
result = method (self, * args, ** kwargs) 
            if isinstance (result, Future) : 
                result = (yield result) 
raise gen.Return (result) 
return wrapper 
return validator 

    
    

    Fix the buggy line: return validator
assistant
#Here is Python program to fix the buggy line: return validator
.

return def _authorized_decorator(