Add Google authentication support for the backend

General
1

Support Google Auth

2

Any chance you could describe how you envision it working?

3

I’d like to see Google oath2 idm integration including authorization refresh tokens. So its more than just authentication and the initial authorization token…because that initial authorization token expires. (https://developers.google.com/identity/protocols/OAuth2WebServer#refresh). This will allow applications to fully utilize the google oauth2 integration and make requests for new access tokens (offline or in the event of a long session where the initial token expires).
Firebase has the same problem: http://stackoverflow.com/questions/27890737/firebase-google-auth-offline-access-type-in-order-to-get-a-token-refresh

4

Is google login available for use?