OAuth2 Google Calendar API Redirect Route Complete

redirect.py

@app.route("/authorize-user")
def auth_user():
    """
    Redirects a user to Google's authorization server to show the OAuth
    Consent screen and get user consent.
    """
    return redirect(authorization_url)

@app.route("/oauth2redirect")
def oauth2_redirect():
    """
    The redirect URI that Google hits after user grants access in the OAuth
    consent screen where we fetch the access token from the access code given in the 
    URL and set them in the flask session.
    """
    # grabs the URL response from the redirect after auth
    authorization_response = request.url

    # fetchs the access code from the request url response
    # and then exchanges it for the token
    flow.fetch_token(authorization_response=authorization_response)

    # grab and set credentials into your flask session 
    # TODO: in production move these credentials to a persistent data store.
    credentials = flow.credentials
    flask.session['credentials'] = {
        'token': credentials.token,
        'refresh_token': credentials.refresh_token,
        'token_uri': credentials.token_uri,
        'client_id': credentials.client_id,
        'client_secret': credentials.client_secret,
        'scopes': credentials.scopes}

    return flask.redirect(flask.url_for('test_api_request')) # to be written