Parse.com在调用云代码时识别用户是否是匿名用户

I am trying to secure my app build on parse.com. I am using cloud code to save sove objects and ideally, I would allow registered user to do things that anonymous ones don't. Is there a way that I can detect if the user who is calling cloud code is a registered user or an anonymous user?I am trying to secure my app build on parse.com