DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (b6d82b1a6b02)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163
/* -*- 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 "AccessCheck.h"
#include "js/Proxy.h"
#include "mozilla/dom/BrowsingContext.h"
#include "mozilla/dom/RemoteObjectProxy.h"
#include "mozilla/dom/WindowBinding.h"
#include "xpcprivate.h"

namespace mozilla {
namespace dom {

/**
 * RemoteOuterWindowProxy is the proxy handler for the WindowProxy objects for
 * Window objects that live in a different process.
 *
 * RemoteOuterWindowProxy holds a BrowsingContext, which is cycle collected.
 * This reference is declared to the cycle collector via NoteChildren().
 */

class RemoteOuterWindowProxy
    : public RemoteObjectProxy<BrowsingContext,
                               Window_Binding::sCrossOriginAttributes,
                               Window_Binding::sCrossOriginMethods> {
 public:
  typedef RemoteObjectProxy Base;

  constexpr RemoteOuterWindowProxy()
      : RemoteObjectProxy(prototypes::id::Window) {}

  // Standard internal methods
  bool getOwnPropertyDescriptor(
      JSContext* aCx, JS::Handle<JSObject*> aProxy, JS::Handle<jsid> aId,
      JS::MutableHandle<JS::PropertyDescriptor> aDesc) const final;
  bool ownPropertyKeys(JSContext* aCx, JS::Handle<JSObject*> aProxy,
                       JS::MutableHandleVector<jsid> aProps) const final;

  // SpiderMonkey extensions
  bool getOwnEnumerablePropertyKeys(
      JSContext* cx, JS::Handle<JSObject*> proxy,
      JS::MutableHandleVector<jsid> props) const final;

  void NoteChildren(JSObject* aProxy,
                    nsCycleCollectionTraversalCallback& aCb) const override {
    CycleCollectionNoteChild(aCb,
                             static_cast<BrowsingContext*>(GetNative(aProxy)),
                             "js::GetObjectPrivate(obj)");
  }
};

static const RemoteOuterWindowProxy sSingleton;

// Give RemoteOuterWindowProxy 2 reserved slots, like the other wrappers,
// so JSObject::swap can swap it with CrossCompartmentWrappers without requiring
// malloc.
template <>
const JSClass RemoteOuterWindowProxy::Base::sClass =
    PROXY_CLASS_DEF("Proxy", JSCLASS_HAS_RESERVED_SLOTS(2));

bool GetRemoteOuterWindowProxy(JSContext* aCx, BrowsingContext* aContext,
                               JS::Handle<JSObject*> aTransplantTo,
                               JS::MutableHandle<JSObject*> aRetVal) {
  MOZ_ASSERT(!aContext->GetDocShell(),
             "Why are we creating a RemoteOuterWindowProxy?");

  sSingleton.GetProxyObject(aCx, aContext, aTransplantTo, aRetVal);
  return !!aRetVal;
}

BrowsingContext* GetBrowsingContext(JSObject* aProxy) {
  MOZ_ASSERT(IsRemoteObjectProxy(aProxy, prototypes::id::Window));
  return static_cast<BrowsingContext*>(
      RemoteObjectProxyBase::GetNative(aProxy));
}

bool WrapResult(JSContext* aCx, JS::Handle<JSObject*> aProxy,
                BrowsingContext* aResult, unsigned attrs,
                JS::MutableHandle<JS::PropertyDescriptor> aDesc) {
  JS::Rooted<JS::Value> v(aCx);
  if (!ToJSValue(aCx, WindowProxyHolder(aResult), &v)) {
    return false;
  }
  aDesc.setDataDescriptor(v, attrs);
  aDesc.object().set(aProxy);
  return true;
}

bool RemoteOuterWindowProxy::getOwnPropertyDescriptor(
    JSContext* aCx, JS::Handle<JSObject*> aProxy, JS::Handle<jsid> aId,
    JS::MutableHandle<JS::PropertyDescriptor> aDesc) const {
  BrowsingContext* bc = GetBrowsingContext(aProxy);
  uint32_t index = GetArrayIndexFromId(aId);
  if (IsArrayIndex(index)) {
    const BrowsingContext::Children& children = bc->GetChildren();
    if (index < children.Length()) {
      return WrapResult(aCx, aProxy, children[index],
                        JSPROP_READONLY | JSPROP_ENUMERATE, aDesc);
    }
    return ReportCrossOriginDenial(aCx, aId, NS_LITERAL_CSTRING("access"));
  }

  bool ok = CrossOriginGetOwnPropertyHelper(aCx, aProxy, aId, aDesc);
  if (!ok || aDesc.object()) {
    return ok;
  }

  if (JSID_IS_STRING(aId)) {
    nsAutoJSString str;
    if (!str.init(aCx, JSID_TO_STRING(aId))) {
      return false;
    }

    for (BrowsingContext* child : bc->GetChildren()) {
      if (child->NameEquals(str)) {
        return WrapResult(aCx, aProxy, child, JSPROP_READONLY, aDesc);
      }
    }
  }

  return CrossOriginPropertyFallback(aCx, aProxy, aId, aDesc);
}

bool AppendIndexedPropertyNames(JSContext* aCx, BrowsingContext* aContext,
                                JS::MutableHandleVector<jsid> aIndexedProps) {
  int32_t length = aContext->GetChildren().Length();
  if (!aIndexedProps.reserve(aIndexedProps.length() + length)) {
    return false;
  }

  for (int32_t i = 0; i < length; ++i) {
    aIndexedProps.infallibleAppend(INT_TO_JSID(i));
  }
  return true;
}

bool RemoteOuterWindowProxy::ownPropertyKeys(
    JSContext* aCx, JS::Handle<JSObject*> aProxy,
    JS::MutableHandleVector<jsid> aProps) const {
  BrowsingContext* bc = GetBrowsingContext(aProxy);

  // https://html.spec.whatwg.org/multipage/window-object.html#windowproxy-ownpropertykeys:crossoriginownpropertykeys-(-o-)
  // step 3 to 5
  if (!AppendIndexedPropertyNames(aCx, bc, aProps)) {
    return false;
  }

  // https://html.spec.whatwg.org/multipage/window-object.html#windowproxy-ownpropertykeys:crossoriginownpropertykeys-(-o-)
  // step 7
  return RemoteObjectProxy::ownPropertyKeys(aCx, aProxy, aProps);
}

bool RemoteOuterWindowProxy::getOwnEnumerablePropertyKeys(
    JSContext* aCx, JS::Handle<JSObject*> aProxy,
    JS::MutableHandleVector<jsid> aProps) const {
  return AppendIndexedPropertyNames(aCx, GetBrowsingContext(aProxy), aProps);
}

}  // namespace dom
}  // namespace mozilla