Tornado - Authentication

Quote from site :

Tornado provides get_current_user() method to determine if the user is already logged in. Developers need to override this method to get the current user and that can be done through cookies (secure). Every logged-in user, is represented by Tornado as self.current_user. By default this value is set to None.

http://technobeans.wordpress.com/2012/08/14/tornado-authentication/

import tornado.ioloop
import tornado.web

class Main(tornado.web.RequestHandler):
        def get_current_user(self):
                return self.get_secure_cookie("user")

        def get(self):
                if not self.current_user:
                        self.redirect("/login")
                        return
                username = self.current_user
                self.write('Hi there, '+ username)

class Login(Main):
        def get(self):
                self.render('auth.html')
        def post(self):
                self.set_secure_cookie("user", self.get_argument("username"))
                self.redirect("/")

application = tornado.web.Application([
        (r"/", Main),
        (r"/login", Login),
        (r"/(style\.css)",tornado.web.StaticFileHandler, {"path": "./css/"}),
        ],debug=True, cookie_secret="61oETzKXQAGaYdkL5gEmGeJJFuYh7EQnp2XdTP1o/Vo=")

if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()