Feature Request

Add support for user refresh tokens to authenticate supply. User refresh tokens are described here: https://developers.google.com/android-publisher/authorization

Motivation Behind Feature

In some corporate setups the play store page is not owned/managed internally and it is therefore difficult/impossible to get access to the service account. Adding support for alternative authentication methods would make fastlane more useful in these situations.

Feature Description

It would be useful if supply was able to accept a json file containing refresh token details and use this to authenticate with the google api. The code change required would be very small, this would need to be added to initialize in AbstractGoogleServiceClient:

if is_refresh_token
    auth_client = Google::Auth::UserRefreshCredentials.make_creds(json_key_io: service_account_json, scope: self.class::SCOPE)
else
    auth_client = Google::Auth::ServiceAccountCredentials.make_creds(json_key_io: service_account_json, scope: self.class::SCOPE)
end

is_refresh_token could be set by a command line switch, or determined automatically by inspecting the provided json.

Alternatives or Workarounds

None that I know of.