Authenticating Users

This part of the Python Guestbook code walkthrough shows how to authenticate users and display a customized greeting for the signed-in user.

This page is part of a multi-page tutorial. To start from the beginning and see instructions for setting up, go to Creating a Guestbook.

Signing in users

The MainPage class defines a handler for HTTP GET requests to the root path '/'. The handler checks to see whether a user is signed in:

If the user is already signed in to your application, the get_current_user() method returns a User object, and the app displays the users's nickname. If the user has not signed in, the code redirects the user's browser to the Google account sign-in screen. The Google account sign-in mechanism sends the user back to the app after the user has signed in.

For more information, see the Users API.

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