Flask OAuth Twitter

flask_oauth.py

@app.route('/oauth_authorized')
@twitter.authorized_handler
def oauth_authorized(resp):
    next_url = request.args.get('next') or url_for('index')
    if resp is None:
        flash('Authorization denied.  Thanks for nothing.', 'error')
        return redirect(next_url)

    if RedisUser.find(resp['user_id']) is None:
        flash('Authorized but unknown user.', 'error')
        return redirect(next_url)

    session['twitter_token'] = (
        resp['oauth_token'],
        resp['oauth_token_secret']
    )
    session['twitter_user'] = (
        resp['user_id'],
        resp['screen_name']
    )

    flash('Signed in as %s' % resp['screen_name'], 'success')
    return redirect(next_url)