/* -*- 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/Permissions.h"

#include "mozilla/dom/ContentChild.h"

#include "mozilla/dom/PermissionsBinding.h"

#include "mozilla/dom/Promise.h"

#include "mozilla/Services.h"

#include "nsIPermissionManager.h"

#include "PermissionUtils.h"

namespace mozilla {

namespace dom {

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Permissions)

  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY

  NS_INTERFACE_MAP_ENTRY(nsISupports)

NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(Permissions)

NS_IMPL_CYCLE_COLLECTING_RELEASE(Permissions)

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(Permissions, mWindow)

Permissions::Permissions(nsPIDOMWindowInner* aWindow)

  : mWindow(aWindow)

{

}

Permissions::~Permissions()

{

}

JSObject*

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

{

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

}

namespace {

already_AddRefed<PermissionStatus>

CreatePermissionStatus(JSContext* aCx,

                       JS::Handle<JSObject*> aPermission,

                       nsPIDOMWindowInner* aWindow,

                       ErrorResult& aRv)

{

  PermissionDescriptor permission;

  JS::Rooted<JS::Value> value(aCx, JS::ObjectOrNullValue(aPermission));

  if (NS_WARN_IF(!permission.Init(aCx, value))) {

    aRv.NoteJSContextException(aCx);

    return nullptr;

  }

  switch (permission.mName) {

    case PermissionName::Geolocation:

    case PermissionName::Notifications:

    case PermissionName::Push:

    case PermissionName::Persistent_storage:

      return PermissionStatus::Create(aWindow, permission.mName, aRv);

    default:

      MOZ_ASSERT_UNREACHABLE("Unhandled type");

      aRv.Throw(NS_ERROR_NOT_IMPLEMENTED);

      return nullptr;

  }

}

} // namespace

already_AddRefed<Promise>

Permissions::Query(JSContext* aCx,

                   JS::Handle<JSObject*> aPermission,

                   ErrorResult& aRv)

{

  if (!mWindow) {

    aRv.Throw(NS_ERROR_UNEXPECTED);

    return nullptr;

  }

  RefPtr<PermissionStatus> status =

    CreatePermissionStatus(aCx, aPermission, mWindow, aRv);

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

    MOZ_ASSERT(!status);

    return nullptr;

  }

  MOZ_ASSERT(status);

  RefPtr<Promise> promise = Promise::Create(mWindow->AsGlobal(), aRv);

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

    return nullptr;

  }

  promise->MaybeResolve(status);

  return promise.forget();

}

/* static */ nsresult

Permissions::RemovePermission(nsIPrincipal* aPrincipal, const char* aPermissionType)

{

  MOZ_ASSERT(XRE_IsParentProcess());

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

  if (NS_WARN_IF(!permMgr)) {

    return NS_ERROR_FAILURE;

  }

  return permMgr->RemoveFromPrincipal(aPrincipal, aPermissionType);

}

already_AddRefed<Promise>

Permissions::Revoke(JSContext* aCx,

                    JS::Handle<JSObject*> aPermission,

                    ErrorResult& aRv)

{

  if (!mWindow) {

    aRv.Throw(NS_ERROR_UNEXPECTED);

    return nullptr;

  }

  PermissionDescriptor permission;

  JS::Rooted<JS::Value> value(aCx, JS::ObjectOrNullValue(aPermission));

  if (NS_WARN_IF(!permission.Init(aCx, value))) {

    aRv.NoteJSContextException(aCx);

    return nullptr;

  }

  RefPtr<Promise> promise = Promise::Create(mWindow->AsGlobal(), aRv);

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

    return nullptr;

  }

  nsCOMPtr<nsIDocument> document = mWindow->GetExtantDoc();

  if (!document) {

    promise->MaybeReject(NS_ERROR_UNEXPECTED);

    return promise.forget();

  }

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

  if (NS_WARN_IF(!permMgr)) {

    promise->MaybeReject(NS_ERROR_FAILURE);

    return promise.forget();

  }

  const char* permissionType = PermissionNameToType(permission.mName);

  nsresult rv;

  if (XRE_IsParentProcess()) {

    rv = RemovePermission(document->NodePrincipal(), permissionType);

  } else {

    // Permissions can't be removed from the content process. Send a message

    // to the parent; `ContentParent::RecvRemovePermission` will call

    // `RemovePermission`.

    ContentChild::GetSingleton()->SendRemovePermission(

      IPC::Principal(document->NodePrincipal()), nsDependentCString(permissionType), &rv);

  }

  if (NS_WARN_IF(NS_FAILED(rv))) {

    promise->MaybeReject(rv);

    return promise.forget();

  }

  RefPtr<PermissionStatus> status =

    CreatePermissionStatus(aCx, aPermission, mWindow, aRv);

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

    MOZ_ASSERT(!status);

    return nullptr;

  }

  MOZ_ASSERT(status);

  promise->MaybeResolve(status);

  return promise.forget();

}

} // namespace dom

} // namespace mozilla