File: ServiceWorker.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 "ServiceWorker.h"

#include "nsIDocument.h"
#include "nsPIDOMWindow.h"
#include "ServiceWorkerManager.h"
#include "ServiceWorkerPrivate.h"

#include "mozilla/dom/DOMPrefs.h"
#include "mozilla/dom/ClientIPCTypes.h"
#include "mozilla/dom/ClientState.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/ServiceWorkerGlobalScopeBinding.h"
#include "mozilla/dom/WorkerPrivate.h"

#ifdef XP_WIN
#undef PostMessage
#endif

using mozilla::ErrorResult;
using namespace mozilla::dom;

namespace mozilla {
namespace dom {

bool ServiceWorkerVisible(JSContext* aCx, JSObject* aObj) {
  if (NS_IsMainThread()) {
    return DOMPrefs::ServiceWorkersEnabled();
  }

  return IS_INSTANCE_OF(ServiceWorkerGlobalScope, aObj);
}

// static
already_AddRefed<ServiceWorker> ServiceWorker::Create(
    nsIGlobalObject* aOwner, const ServiceWorkerDescriptor& aDescriptor) {
  RefPtr<ServiceWorker> ref;

  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
  if (!swm) {
    return ref.forget();
  }

  RefPtr<ServiceWorkerRegistrationInfo> reg =
      swm->GetRegistration(aDescriptor.PrincipalInfo(), aDescriptor.Scope());
  if (!reg) {
    return ref.forget();
  }

  RefPtr<ServiceWorkerInfo> info = reg->GetByDescriptor(aDescriptor);
  if (!info) {
    return ref.forget();
  }

  ref = new ServiceWorker(aOwner, aDescriptor, info);
  return ref.forget();
}

ServiceWorker::ServiceWorker(nsIGlobalObject* aGlobal,
                             const ServiceWorkerDescriptor& aDescriptor,
                             ServiceWorker::Inner* aInner)
    : DOMEventTargetHelper(aGlobal), mDescriptor(aDescriptor), mInner(aInner) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_DIAGNOSTIC_ASSERT(aGlobal);
  MOZ_DIAGNOSTIC_ASSERT(mInner);

  // This will update our state too.
  mInner->AddServiceWorker(this);
}

ServiceWorker::~ServiceWorker() {
  MOZ_ASSERT(NS_IsMainThread());
  if (mInner) {
    mInner->RemoveServiceWorker(this);
  }
}

NS_IMPL_ADDREF_INHERITED(ServiceWorker, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(ServiceWorker, DOMEventTargetHelper)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ServiceWorker)
  NS_INTERFACE_MAP_ENTRY(ServiceWorker)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)

JSObject* ServiceWorker::WrapObject(JSContext* aCx,
                                    JS::Handle<JSObject*> aGivenProto) {
  MOZ_ASSERT(NS_IsMainThread());

  return ServiceWorkerBinding::Wrap(aCx, this, aGivenProto);
}

ServiceWorkerState ServiceWorker::State() const { return mDescriptor.State(); }

void ServiceWorker::SetState(ServiceWorkerState aState) {
  ServiceWorkerState oldState = mDescriptor.State();
  mDescriptor.SetState(aState);
  if (oldState != aState) {
    DOMEventTargetHelper::DispatchTrustedEvent(
        NS_LITERAL_STRING("statechange"));
  }
}

void ServiceWorker::GetScriptURL(nsString& aURL) const {
  CopyUTF8toUTF16(mDescriptor.ScriptURL(), aURL);
}

void ServiceWorker::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
                                const Sequence<JSObject*>& aTransferable,
                                ErrorResult& aRv) {
  if (State() == ServiceWorkerState::Redundant || !mInner) {
    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
    return;
  }

  mInner->PostMessage(GetParentObject(), aCx, aMessage, aTransferable, aRv);
}

const ServiceWorkerDescriptor& ServiceWorker::Descriptor() const {
  return mDescriptor;
}

void ServiceWorker::DisconnectFromOwner() {
  if (mInner) {
    mInner->RemoveServiceWorker(this);
    mInner = nullptr;
  }
  DOMEventTargetHelper::DisconnectFromOwner();
}

}  // namespace dom
}  // namespace mozilla