tornado-get-current-user-secure.py

import tornado.ioloop
import tornado.web
 
from tornado.options import parse_command_line, define, options
 
define("port", default=8888)
define("debug", default=False)

class AuthHandler(tornado.web.RequestHandler):
    def get(self):
        # http://www.tornadoweb.org/en/branch3.1/_modules/tornado/web.html#RequestHandler.set_secure_cookie
        self.set_secure_cookie("username", "foo")
        # http://www.tornadoweb.org/en/stable/_modules/tornado/web.html#RequestHandler.redirect
        self.redirect("/")
 
class MainHandler(tornado.web.RequestHandler):
    def get_current_user(self):
        return self.get_secure_cookie("username")

    def get(self):
        user = self.get_current_user()
        if not user:
            raise tornado.web.HTTPError(401, "Access denied")
    
        self.write("Welcome back, {}".format(user))
 
handlers = [
    (r"/auth", AuthHandler),
    (r"/", MainHandler),
]
 
if __name__ == "__main__":
    parse_command_line()

    opts = {
        "debug": options.debug,
        "cookie_secret": "II*^WvQiOkv)QihQwQZ<JH!YY/q)v%TY"
    }
    
    application = tornado.web.Application(handlers, **opts)
    application.listen(options.port)
    
    tornado.ioloop.IOLoop.instance().start()