dazuma
commented
1 year ago I suspect the best way forward is to include appropriate documentation and/or code in the googleauth gem, so that you can attach Google credentials to any http request as you suggest. I'm going to transfer this issue over there for tracking.
It's very difficult to find the classes needed to make a request, so at least you should provide a method to make any request but taking advantage of the authentication from the library.
Another option that would work for me is to use raw requests, but I don't find the documentation on how to authenticate using service accounts. The one I found only works with the library: https://cloud.google.com/docs/authentication/production