polkit.addRule(function (action, subject) {
  var idx = action.id.lastIndexOf(".");
  var username_stripped = action.id.substring(0, idx);
  var username = action.id.substring(idx + 1);
  if (username_stripped === "{{RULE_BASE}}") {
    if (subject.user === username) {
      return polkit.Result.YES;
    } else {
      return polkit.Result.NO;
    }
  }
});
