testWindowNonConfigurable.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 * vim: set ts=8 sts=2 et sw=2 tw=80:

*/

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "js/PropertyAndElement.h"  // JS_DefineProperty

#include "js/Proxy.h"

#include "jsapi-tests/tests.h"

class WindowProxyHandler : public js::ForwardingProxyHandler {

 public:

  constexpr WindowProxyHandler() : js::ForwardingProxyHandler(&family) {}

  static const char family;

  virtual bool defineProperty(JSContext* cx, JS::HandleObject proxy,

                              JS::HandleId id,

                              JS::Handle<JS::PropertyDescriptor> desc,

                              JS::ObjectOpResult& result) const override {

    if (desc.hasConfigurable() && !desc.configurable()) {

      result.failCantDefineWindowNonConfigurable();

      return true;

    return ForwardingProxyHandler::defineProperty(cx, proxy, id, desc, result);

};

const char WindowProxyHandler::family = 0;

static const JSClass windowProxy_class =

    PROXY_CLASS_DEF("TestWindowProxy", JSCLASS_HAS_RESERVED_SLOTS(1));

static const WindowProxyHandler windowProxy_handler;

BEGIN_TEST(testWindowNonConfigurable) {

  JS::RootedObject wrapped(cx, JS_NewObject(cx, nullptr));

  CHECK(wrapped);

  JS::RootedValue wrappedVal(cx, JS::ObjectValue(*wrapped));

  js::ProxyOptions options;

  options.setClass(&windowProxy_class);

  JS::RootedObject obj(cx, NewProxyObject(cx, &windowProxy_handler, wrappedVal,

                                          nullptr, options));

  CHECK(obj);

  CHECK(JS_DefineProperty(cx, global, "windowProxy", obj, 0));

  JS::RootedValue v(cx);

  EVAL(

      "Object.defineProperty(windowProxy, 'bar', {value: 1, configurable: "

      "false})",

      &v);

  CHECK(v.isNull());  // This is the important bit!

  EVAL(

      "Object.defineProperty(windowProxy, 'bar', {value: 1, configurable: "

      "true})",

      &v);

  CHECK(&v.toObject() == obj);

  EVAL(

      "Reflect.defineProperty(windowProxy, 'foo', {value: 1, configurable: "

      "false})",

      &v);

  CHECK(v.isFalse());

  EVAL(

      "Reflect.defineProperty(windowProxy, 'foo', {value: 1, configurable: "

      "true})",

      &v);

  CHECK(v.isTrue());

  return true;

END_TEST(testWindowNonConfigurable)