274 def checkCanProcessRequest(role_name):

   275   """Raises an alternate HTTP response if the specified request does not exist

   276      or if it's state is completed or denied. 

   277   """

   278   def wrapper(request, args, kwargs):

   279 

   280     fields = {'link_id': kwargs['link_id'],

   281         'scope_path': kwargs['scope_path'],

   282         'role': role_name}

   283 

   284     request_entity = request_logic.getFromFieldsOr404(**fields)

   285 

   286     if request_entity.state in ['completed', 'denied']:

   287       # TODO tell the user that this request has been processed

   288       deny(request, args, kwargs)

   289 

   290     return

   291   return wrapper

   292 

   293