class Google::Auth::GCECredentials

def add_universe_domain_to hash
  return if @universe_domain_overridden
  universe_domain =
    if disable_universe_domain_check
      # TODO: Remove when universe domain metadata endpoint is stable (see b/349488459).
      "googleapis.com"
    else
      Google::Cloud.env.lookup_metadata "universe", "universe-domain"
    end
  universe_domain = "googleapis.com" if !universe_domain || universe_domain.empty?
  hash["universe_domain"] = universe_domain.strip
end