The uberauth library is a base which tries to help with all authentication methods that work with a request & callback for example OAuth2.

Yeah, it’s built on the same concept as OmniAuth, so you want to use the individual strategy libraries. Here’s the one for google: GitHub - ueberauth/ueberauth_google: Google OAuth2 Strategy for Überauth.

Side note; I never really liked this approach, it feels like too much abstraction. I built Assent to have everything out-of-the-box to both conform the strategy flows, make each strategy integration as minimal as possible, and prevent breaking stuff whenever there’s any changes to the core logic: GitHub - pow-auth/assent: Multi-provider framework in Elixir

I had the same impression the first time I looked into this… sometimes it’s just easier to read the code