Using Google OAuth2 with Flask

Question

Can anyone point me to a complete example for authenticating with Google accounts using OAuth2 and Flask, and not on App Engine?

I am trying to have users g

Answer 1

Give Authomatic a try (I'm the maintainer of that project). It is very simple to use, works with any Python framework and supports 16 OAuth 2.0, 10 OAuth 1.0a providers and OpenID.

Here is a simple example about how to authenticate a user with Google and get his/her list of YouTube videos:

# main.py

from flask import Flask, request, make_response, render_template
from authomatic.adapters import WerkzeugAdapter
from authomatic import Authomatic
from authomatic.providers import oauth2


CONFIG = {
    'google': {
        'class_': oauth2.Google,
        'consumer_key': '########################',
        'consumer_secret': '########################',
        'scope': oauth2.Google.user_info_scope + ['https://gdata.youtube.com'],
    },
}

app = Flask(__name__)
authomatic = Authomatic(CONFIG, 'random secret string for session signing')


@app.route('/login//', methods=['GET', 'POST'])
def login(provider_name):
    response = make_response()

    # Authenticate the user
    result = authomatic.login(WerkzeugAdapter(request, response), provider_name)

    if result:
        videos = []
        if result.user:
            # Get user info
            result.user.update()

            # Talk to Google YouTube API
            if result.user.credentials:
                response = result.provider.access('https://gdata.youtube.com/'
                    'feeds/api/users/default/playlists?alt=json')
                if response.status == 200:
                    videos = response.data.get('feed', {}).get('entry', [])

        return render_template(user_name=result.user.name,
                               user_email=result.user.email,
                               user_id=result.user.id,
                               youtube_videos=videos)
    return response


if __name__ == '__main__':
    app.run(debug=True)

There is also a very simple Flask tutorial which shows how to authenticate a user by Facebook and Twitter and talk to their APIs to read the user's newsfeeds.