/* -*- 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 "mozilla/dom/PermissionStatus.h"

#include "mozilla/AsyncEventDispatcher.h"

#include "mozilla/Services.h"

#include "nsIPermissionManager.h"

#include "PermissionObserver.h"

#include "PermissionUtils.h"

namespace mozilla {

namespace dom {

/* static */ already_AddRefed<PermissionStatus>

PermissionStatus::Create(nsPIDOMWindowInner* aWindow,

                         PermissionName aName,

                         ErrorResult& aRv)

{

  RefPtr<PermissionStatus> status = new PermissionStatus(aWindow, aName);

  aRv = status->Init();

  if (NS_WARN_IF(aRv.Failed())) {

    return nullptr;

  }

  return status.forget();

}

PermissionStatus::PermissionStatus(nsPIDOMWindowInner* aWindow,

                                   PermissionName aName)

  : DOMEventTargetHelper(aWindow)

  , mName(aName)

  , mState(PermissionState::Denied)

{

  KeepAliveIfHasListenersFor(NS_LITERAL_STRING("change"));

}

nsresult

PermissionStatus::Init()

{

  mObserver = PermissionObserver::GetInstance();

  if (NS_WARN_IF(!mObserver)) {

    return NS_ERROR_FAILURE;

  }

  mObserver->AddSink(this);

  nsresult rv = UpdateState();

  if (NS_WARN_IF(NS_FAILED(rv))) {

    return rv;

  }

  return NS_OK;

}

PermissionStatus::~PermissionStatus()

{

  if (mObserver) {

    mObserver->RemoveSink(this);

  }

}

JSObject*

PermissionStatus::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)

{

  return PermissionStatus_Binding::Wrap(aCx, this, aGivenProto);

}

nsresult

PermissionStatus::UpdateState()

{

  nsCOMPtr<nsIPermissionManager> permMgr = services::GetPermissionManager();

  if (NS_WARN_IF(!permMgr)) {

    return NS_ERROR_FAILURE;

  }

  nsCOMPtr<nsPIDOMWindowInner> window = GetOwner();

  if (NS_WARN_IF(!window)) {

    return NS_ERROR_FAILURE;

  }

  uint32_t action = nsIPermissionManager::DENY_ACTION;

  nsresult rv = permMgr->TestPermissionFromWindow(window,

                                                  PermissionNameToType(mName),

                                                  &action);

  if (NS_WARN_IF(NS_FAILED(rv))) {

    return rv;

  }

  mState = ActionToPermissionState(action);

  return NS_OK;

}

already_AddRefed<nsIPrincipal>

PermissionStatus::GetPrincipal() const

{

  nsCOMPtr<nsPIDOMWindowInner> window = GetOwner();

  if (NS_WARN_IF(!window)) {

    return nullptr;

  }

  nsIDocument* doc = window->GetExtantDoc();

  if (NS_WARN_IF(!doc)) {

    return nullptr;

  }

  nsCOMPtr<nsIPrincipal> principal =

    mozilla::BasePrincipal::Cast(doc->NodePrincipal())->CloneStrippingUserContextIdAndFirstPartyDomain();

  NS_ENSURE_TRUE(principal, nullptr);

  return principal.forget();

}

void

PermissionStatus::PermissionChanged()

{

  auto oldState = mState;

  UpdateState();

  if (mState != oldState) {

    RefPtr<AsyncEventDispatcher> eventDispatcher =

      new AsyncEventDispatcher(this, NS_LITERAL_STRING("change"), CanBubble::eNo);

    eventDispatcher->PostDOMEvent();

  }

}

void

PermissionStatus::DisconnectFromOwner()

{

  IgnoreKeepAliveIfHasListenersFor(NS_LITERAL_STRING("change"));

  if (mObserver) {

    mObserver->RemoveSink(this);

    mObserver = nullptr;

  }

  DOMEventTargetHelper::DisconnectFromOwner();

}

} // namespace dom

} // namespace mozilla