code: private static void checkClientSecretsFile( GoogleClientSecrets clientSecrets )
      {
          if ( clientSecrets.getDetails().getClientId().startsWith( "[[INSERT" )
                  || clientSecrets.getDetails().getClientSecret().startsWith( "[[INSERT" ) )
          {
              LOG.error( "Enter Client ID and Secret from "
                      + "APIs console into resources/client_secrets.json." );
              System.exit( 1 );
          }
      }
docs: Ensure the client secrets file has been filled out.
  
  @param clientSecrets the GoogleClientSecrets containing data from the
  file