Google Oauth 2 for http://blog.miguelgrinberg.com/post/oauth-authentication-with-flask

gistfile1.txt

class GoogleSignIn(OAuthSignIn):
    def __init__(self):
        super(GoogleSignIn, self).__init__('google')
        self.service = OAuth2Service(
            name='google',
            client_id=self.consumer_id,
            client_secret=self.consumer_secret,
            authorize_url='https://accounts.google.com/o/oauth2/auth',
            access_token_url='https://accounts.google.com/o/oauth2/token',
            base_url='https://www.googleapis.com/plus/v1/people/'
        )

    def authorize(self):
        return redirect(self.service.get_authorize_url(
            scope='email',
            response_type='code',
            redirect_uri=self.get_callback_url())
        )

    def callback(self):
        if 'code' not in request.args:
            return None, None, None
        oauth_session = self.service.get_auth_session(
            data={'code': request.args['code'],
                  'grant_type': 'authorization_code',
                  'redirect_uri': self.get_callback_url()},
            decoder=json.loads
        )
        me = json.loads(oauth_session.get('me').text)
        me_email = None
        for e in me['emails']:
            if e['type'] == 'account':
                me_email = e['value']
        return (
            me.get('id'),
            me.get('displayName'),
            me_email)