mirror of
https://github.com/mozilla/gecko-dev.git
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104 lines
2.5 KiB
C++
104 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "MessageChannel.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/dom/MessageChannelBinding.h"
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#include "mozilla/dom/MessagePort.h"
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#include "nsContentUtils.h"
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#include "nsPIDOMWindow.h"
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namespace mozilla {
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namespace dom {
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NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(MessageChannel, mWindow, mPort1, mPort2)
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NS_IMPL_CYCLE_COLLECTING_ADDREF(MessageChannel)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(MessageChannel)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MessageChannel)
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NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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namespace {
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bool gPrefInitialized = false;
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bool gPrefEnabled = false;
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}
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/* static */ bool
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MessageChannel::Enabled(JSContext* aCx, JSObject* aObj)
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{
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if (!gPrefInitialized) {
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Preferences::AddBoolVarCache(&gPrefEnabled, "dom.messageChannel.enabled");
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gPrefInitialized = true;
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}
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// Enabled by pref
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if (gPrefEnabled) {
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return true;
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}
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// Chrome callers are allowed.
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if (nsContentUtils::ThreadsafeIsCallerChrome()) {
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return true;
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}
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nsCOMPtr<nsIPrincipal> principal = nsContentUtils::SubjectPrincipal();
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MOZ_ASSERT(principal);
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nsCOMPtr<nsIURI> uri;
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if (NS_FAILED(principal->GetURI(getter_AddRefs(uri))) || !uri) {
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return false;
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}
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bool isResource = false;
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if (NS_FAILED(uri->SchemeIs("resource", &isResource))) {
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return false;
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}
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return isResource;
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}
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MessageChannel::MessageChannel(nsPIDOMWindow* aWindow)
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: mWindow(aWindow)
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{
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MOZ_COUNT_CTOR(MessageChannel);
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mPort1 = new MessagePort(mWindow);
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mPort2 = new MessagePort(mWindow);
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mPort1->Entangle(mPort2);
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mPort2->Entangle(mPort1);
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}
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MessageChannel::~MessageChannel()
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{
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MOZ_COUNT_DTOR(MessageChannel);
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}
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JSObject*
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MessageChannel::WrapObject(JSContext* aCx)
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{
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return MessageChannelBinding::Wrap(aCx, this);
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}
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/* static */ already_AddRefed<MessageChannel>
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MessageChannel::Constructor(const GlobalObject& aGlobal, ErrorResult& aRv)
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{
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nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aGlobal.GetAsSupports());
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if (!window) {
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aRv.Throw(NS_ERROR_UNEXPECTED);
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return nullptr;
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}
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nsRefPtr<MessageChannel> channel = new MessageChannel(window);
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return channel.forget();
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}
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} // namespace dom
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} // namespace mozilla
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