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import tornado
import tornado.web, tornado.httpserver

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


class MainHandler(BaseHandler):
    
    @tornado.web.authenticated
    def get(self):
        name = tornado.escape.xhtml_escape(self.current_user)
        self.write("Hello, " + name)

class LoginHandler(BaseHandler):
    def get(self):
        self.write('<html><body><form action="/login" method="post">'
                   'Name: <input type="text" name="name">'
                   '<input type="submit" value="Sign in">'
                   '</form></body></html>')

    def post(self):
        self.set_secure_cookie("user", self.get_argument("name"))
        self.redirect("/")

application = tornado.web.Application([
    (r"/", MainHandler),
    (r"/login", LoginHandler),
], cookie_secret="61oETzKXQAGaYdkL5gEmGeJJFuYh7EQnp2XdTP1o/Vo=")

if __name__ == '__main__':
    http_server = tornado.httpserver.HTTPServer(application)
    http_server.listen(8888)
    tornado.ioloop.IOLoop.instance().start()