gecko-dev/dom/base/MessageChannel.cpp

105 lines
2.5 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "MessageChannel.h"
#include "mozilla/Preferences.h"
#include "mozilla/dom/MessageChannelBinding.h"
#include "mozilla/dom/MessagePort.h"
#include "nsContentUtils.h"
#include "nsPIDOMWindow.h"
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(MessageChannel, mWindow, mPort1, mPort2)
NS_IMPL_CYCLE_COLLECTING_ADDREF(MessageChannel)
NS_IMPL_CYCLE_COLLECTING_RELEASE(MessageChannel)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MessageChannel)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
namespace {
bool gPrefInitialized = false;
bool gPrefEnabled = false;
}
/* static */ bool
MessageChannel::Enabled(JSContext* aCx, JSObject* aObj)
{
if (!gPrefInitialized) {
Preferences::AddBoolVarCache(&gPrefEnabled, "dom.messageChannel.enabled");
gPrefInitialized = true;
}
// Enabled by pref
if (gPrefEnabled) {
return true;
}
// Chrome callers are allowed.
if (nsContentUtils::ThreadsafeIsCallerChrome()) {
return true;
}
nsCOMPtr<nsIPrincipal> principal = nsContentUtils::SubjectPrincipal();
MOZ_ASSERT(principal);
nsCOMPtr<nsIURI> uri;
if (NS_FAILED(principal->GetURI(getter_AddRefs(uri))) || !uri) {
return false;
}
bool isResource = false;
if (NS_FAILED(uri->SchemeIs("resource", &isResource))) {
return false;
}
return isResource;
}
MessageChannel::MessageChannel(nsPIDOMWindow* aWindow)
: mWindow(aWindow)
{
MOZ_COUNT_CTOR(MessageChannel);
SetIsDOMBinding();
mPort1 = new MessagePort(mWindow);
mPort2 = new MessagePort(mWindow);
mPort1->Entangle(mPort2);
mPort2->Entangle(mPort1);
}
MessageChannel::~MessageChannel()
{
MOZ_COUNT_DTOR(MessageChannel);
}
JSObject*
MessageChannel::WrapObject(JSContext* aCx)
{
return MessageChannelBinding::Wrap(aCx, this);
}
/* static */ already_AddRefed<MessageChannel>
MessageChannel::Constructor(const GlobalObject& aGlobal, ErrorResult& aRv)
{
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aGlobal.GetAsSupports());
if (!window) {
aRv.Throw(NS_ERROR_UNEXPECTED);
return nullptr;
}
nsRefPtr<MessageChannel> channel = new MessageChannel(window);
return channel.forget();
}
} // namespace dom
} // namespace mozilla