realms-wiki/realms/modules/auth/oauth/views.py

from flask import Blueprint, url_for, request, flash, redirect, session, current_app
from .models import User

blueprint = Blueprint('auth.oauth', __name__)


def oauth_failed(next_url):
    flash('You denied the request to sign in.')
    return redirect(next_url)


@blueprint.route("/login/oauth/<provider>")
def login(provider):
    return User.get_app(provider).authorize(callback=url_for('auth.oauth.callback', provider=provider))


@blueprint.route('/login/oauth/<provider>/callback')
def callback(provider):
    next_url = request.args.get('next') or current_app.config['ROOT_ENDPOINT']
    try:
        resp = User.get_app(provider).authorized_response()
        if resp is None:
            flash('You denied the request to sign in.', 'error')
            flash('Reason: ' + request.args['error_reason'] +
                  ' ' + request.args['error_description'], 'error')
            return redirect(next_url)
    except Exception as e:
        flash('Access denied: %s' % e.message)
        return redirect(next_url)

    session[provider + '_token'] = (
        resp['oauth_token'],
        resp['oauth_token_secret']
    )

    return redirect(next_url)