Generating Authbearer token

[vb-git14]

Hi,

I want to generate a authbearer token using a service account ruby library just like we do it using the below code:

gcloud auth application-default print-access-token

I have written a simple piece of code:

require 'googleauth'
authorizer = Google::Auth::ServiceAccountCredentials.make_creds(json_key_io: File.open('sa.json'))
token=authorizer.fetch_access_token!

I can get a token, but this needs scope. I wanted to check if it is possible to generate a token without the scope as well like we do with gcloud auth command below.

Thanks.