SWI-Prolog code for "Login with Google"

This pack deals with "Login With Google" using OpenID Connect (OAuth 2.0 for Login). The code is partially based on pl-oauth2client-for-google

To run the code

1. Follow these steps to create a Google project and get
   • A client ID
   • A client secret
   • Register a redirect url. To test from localhost, this should be `http://localhost:3040/oauth2/auth_redirect`
2. Edit demo/test.pl, fill in the client id and client secret. Start Prolog with demo/test.pl and run the command below to start the server.

   ?- server.

3. Go to `http://localhost:3040` and hit the button. After logging in this should show a Prolog dict holding the Google profile information.

Requirements

Requires SWI-Prolog 7.1.30 or later (to be released, use version from GIT or nightly builds for Windows