1 files changed, 89 insertions, 0 deletions
diff --git a/dom/messagechannel/MessageChannel.cpp b/dom/messagechannel/MessageChannel.cpp
new file mode 100644
index 0000000000..bf95613082
--- /dev/null
+++ b/dom/messagechannel/MessageChannel.cpp
@@ -0,0 +1,89 @@
+/* -*- 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 "MessageChannel.h"
+
+#include "mozilla/dom/MessageChannelBinding.h"
+#include "mozilla/dom/MessagePort.h"
+#include "mozilla/dom/Navigator.h"
+#include "mozilla/dom/WorkerRunnable.h"
+#include "mozilla/dom/Document.h"
+#include "nsIGlobalObject.h"
+#include "nsServiceManagerUtils.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(MessageChannel, mGlobal, 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
+
+MessageChannel::MessageChannel(nsIGlobalObject* aGlobal) : mGlobal(aGlobal) {
+  MOZ_ASSERT(aGlobal);
+}
+
+MessageChannel::~MessageChannel() = default;
+
+JSObject* MessageChannel::WrapObject(JSContext* aCx,
+                                     JS::Handle<JSObject*> aGivenProto) {
+  return MessageChannel_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+/* static */
+already_AddRefed<MessageChannel> MessageChannel::Constructor(
+    const GlobalObject& aGlobal, ErrorResult& aRv) {
+  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
+  return Constructor(global, aRv);
+}
+
+/* static */
+already_AddRefed<MessageChannel> MessageChannel::Constructor(
+    nsIGlobalObject* aGlobal, ErrorResult& aRv) {
+  MOZ_ASSERT(aGlobal);
+
+  nsID portUUID1;
+  aRv = nsID::GenerateUUIDInPlace(portUUID1);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  nsID portUUID2;
+  aRv = nsID::GenerateUUIDInPlace(portUUID2);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  RefPtr<MessageChannel> channel = new MessageChannel(aGlobal);
+
+  channel->mPort1 = MessagePort::Create(aGlobal, portUUID1, portUUID2, aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+
+  channel->mPort2 = MessagePort::Create(aGlobal, portUUID2, portUUID1, aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+
+  channel->mPort1->UnshippedEntangle(channel->mPort2);
+  channel->mPort2->UnshippedEntangle(channel->mPort1);
+
+  // MessagePorts should not work if created from a disconnected window.
+  nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(aGlobal);
+  if (window && !window->GetDocShell()) {
+    // The 2 ports are entangled. We can close one of them to close the other
+    // too.
+    channel->mPort1->CloseForced();
+  }
+
+  return channel.forget();
+}
+
+}  // namespace mozilla::dom