We will start by building over the last recipe. It is easy to just implement Google authentication by leaving out the Facebook auth (by leaving out the Facebook-specific parts).

Now, we have to create a project from the Google developer console (https://console.developers.google.com). Then, we have to create a client ID for the web application; this ID will provide the credentials needed for OAuth to work. The following screenshot should help:

As always, we will first start with the configuration part in my_app/__init__.py:

from flask_oauth import OAuth

oauth = OAuth()

google = oauth.remote_app('google',
    base_url='https://www.google.com/accounts/',
    authorize_url='https://accounts.google.com/o/oauth2/auth',
    request_token_url=None,
    request_token_params={
        'scope': 'https://www.googleapis.com/auth/userinfo.email',
     ...