Authenticating users

The first requirement for our Notes application is showing the home page only to users who are logged in and redirect others to the login form; the users service provided by App Engine is exactly what we need and adding it to our MainHandler class is quite simple:

import webapp2

from google.appengine.api import users

class MainHandler(webapp2.RequestHandler):
    def get(self):
        user = users.get_current_user()
        if user is not None:
            self.response.write('Hello Notes!')
        login_url = users.create_login_url(self.request.uri)
app = webapp2.WSGIApplication([
    ('/', MainHandler)
], debug=True)

The user package we import on the second line of the previous code provides access to users' service functionalities. ...

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