Handlers and the use of decorators

decorators.py

from google.appengine.api import users
from webapp2 import redirect_to, redirect


def google_login_required(handler):
    def _check_login(self, *args, **kwargs):
        user = users.get_current_user()
        if user:
            return handler(self, *args, **kwargs)
        else:
            return self.redirect(users.create_login_url(self.request.uri))
    return _check_login

def admin_required(handler):
    def _check_login(self, *args, **kwargs):
        google_user = users.get_current_user()
        if google_user:
            if not users.is_current_user_admin():
                return redirect_to("forbidden")
            else:
                return handler(self, *args, **kwargs)
        else:
            return self.redirect(users.create_login_url(self.request.uri))
    return _check_login

def normal_login_required(handler):
    # if user logs in with username/password combo
    def _check_login(self, *args, **kwargs):
        # ... write code that checks login here ...
        if valid_login:
            return handler(self, *args, **kwargs)
        else:
            return self.redirect_to("forbidden")
    return _check_login

main.py

from decorators import google_login_required, admin_required

# This one is visible to everyone
class OpenToEveryoneHandler(BaseHandler):
    def get(self):
        return self.render_template("visible_to_everyone.html")

      
# This one is visible to logged in users (via Google login)      
class LimitedVisibilityHandler(BaseHandler):
    @google_login_required
    def get(self):
        return self.render_template("visible_to_logged_in_users.html")

      
# This one is visible to admins     
class AdminVisibilityHandler(BaseHandler):
    @admin_required
    def get(self):
        return self.render_template("visible_to_admins.html")