An example or template to quickly bootstrap an OAuth sign-in process with JWT and using Google as the Identity Provider. It uses the FirebaseUI JavaScript library to handle the sign-in and uses an Elixir plug as an authenticated custom backend server. It's easy to add Facebook, Twitter, and Github as Identify Providers (see the link below). You can also use email as an Identity Provider but I haven't tried that, so I'm not sure what extra work that might entail.

This is as simple as possible to demonstrate the parts. Click the Google badge to sign in and click the Sign out button to sign out. Round trip until it makes sense. ;)

1. git clone https://github.com/formido/google-auth-login-example.git
2. Open the file at priv/app.eex, find the HTML comment labeled TODO, and follow the instructions as clarified in this FirebaseUI-Web document.
3. cd google-auth-login-example
4. mix deps.get
5. iex -S mix
6. Visit localhost:4001 from a browser.