gecko-dev/dom/base/nsContentPermissionHelper.cpp

/* -*- 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 <map>
#include "nsCOMPtr.h"
#include "nsIPrincipal.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/PContentPermission.h"
#include "mozilla/dom/PermissionMessageUtils.h"
#include "mozilla/dom/PContentPermissionRequestParent.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/TabChild.h"
#include "mozilla/dom/TabParent.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/Preferences.h"
#include "mozilla/Unused.h"
#include "nsComponentManagerUtils.h"
#include "nsArrayUtils.h"
#include "nsIMutableArray.h"
#include "nsContentPermissionHelper.h"
#include "nsJSUtils.h"
#include "nsISupportsPrimitives.h"
#include "nsServiceManagerUtils.h"
#include "mozilla/dom/Document.h"
#include "nsIWeakReferenceUtils.h"

using mozilla::Unused;  // <snicker>
using namespace mozilla::dom;
using namespace mozilla;

#define kVisibilityChange "visibilitychange"

class VisibilityChangeListener final : public nsIDOMEventListener {
 public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIDOMEVENTLISTENER

  explicit VisibilityChangeListener(nsPIDOMWindowInner* aWindow);

  void RemoveListener();
  void SetCallback(nsIContentPermissionRequestCallback* aCallback);
  already_AddRefed<nsIContentPermissionRequestCallback> GetCallback();

 private:
  virtual ~VisibilityChangeListener() {}

  nsWeakPtr mWindow;
  nsCOMPtr<nsIContentPermissionRequestCallback> mCallback;
};

NS_IMPL_ISUPPORTS(VisibilityChangeListener, nsIDOMEventListener)

VisibilityChangeListener::VisibilityChangeListener(
    nsPIDOMWindowInner* aWindow) {
  MOZ_ASSERT(aWindow);

  mWindow = do_GetWeakReference(aWindow);
  nsCOMPtr<Document> doc = aWindow->GetExtantDoc();
  if (doc) {
    doc->AddSystemEventListener(NS_LITERAL_STRING(kVisibilityChange),
                                /* listener */ this,
                                /* use capture */ true,
                                /* wants untrusted */ false);
  }
}

NS_IMETHODIMP
VisibilityChangeListener::HandleEvent(Event* aEvent) {
  nsAutoString type;
  aEvent->GetType(type);
  if (!type.EqualsLiteral(kVisibilityChange)) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<Document> doc = do_QueryInterface(aEvent->GetTarget());
  MOZ_ASSERT(doc);

  if (mCallback) {
    mCallback->NotifyVisibility(!doc->Hidden());
  }

  return NS_OK;
}

void VisibilityChangeListener::RemoveListener() {
  nsCOMPtr<nsPIDOMWindowInner> window = do_QueryReferent(mWindow);
  if (!window) {
    return;
  }

  nsCOMPtr<EventTarget> target = window->GetExtantDoc();
  if (target) {
    target->RemoveSystemEventListener(NS_LITERAL_STRING(kVisibilityChange),
                                      /* listener */ this,
                                      /* use capture */ true);
  }
}

void VisibilityChangeListener::SetCallback(
    nsIContentPermissionRequestCallback* aCallback) {
  mCallback = aCallback;
}

already_AddRefed<nsIContentPermissionRequestCallback>
VisibilityChangeListener::GetCallback() {
  nsCOMPtr<nsIContentPermissionRequestCallback> callback = mCallback;
  return callback.forget();
}

namespace mozilla {
namespace dom {

class ContentPermissionRequestParent : public PContentPermissionRequestParent {
 public:
  ContentPermissionRequestParent(const nsTArray<PermissionRequest>& aRequests,
                                 Element* aElement,
                                 const IPC::Principal& aPrincipal,
                                 const IPC::Principal& aTopLevelPrincipal,
                                 const bool aIsHandlingUserInput);
  virtual ~ContentPermissionRequestParent();

  bool IsBeingDestroyed();

  nsCOMPtr<nsIPrincipal> mPrincipal;
  nsCOMPtr<nsIPrincipal> mTopLevelPrincipal;
  nsCOMPtr<Element> mElement;
  bool mIsHandlingUserInput;
  RefPtr<nsContentPermissionRequestProxy> mProxy;
  nsTArray<PermissionRequest> mRequests;

 private:
  virtual mozilla::ipc::IPCResult Recvprompt() override;
  virtual mozilla::ipc::IPCResult RecvNotifyVisibility(
      const bool& aIsVisible) override;
  virtual mozilla::ipc::IPCResult RecvDestroy() override;
  virtual void ActorDestroy(ActorDestroyReason why) override;
};

ContentPermissionRequestParent::ContentPermissionRequestParent(
    const nsTArray<PermissionRequest>& aRequests, Element* aElement,
    const IPC::Principal& aPrincipal, const IPC::Principal& aTopLevelPrincipal,
    const bool aIsHandlingUserInput) {
  MOZ_COUNT_CTOR(ContentPermissionRequestParent);

  mPrincipal = aPrincipal;
  mTopLevelPrincipal = aTopLevelPrincipal;
  mElement = aElement;
  mRequests = aRequests;
  mIsHandlingUserInput = aIsHandlingUserInput;
}

ContentPermissionRequestParent::~ContentPermissionRequestParent() {
  MOZ_COUNT_DTOR(ContentPermissionRequestParent);
}

mozilla::ipc::IPCResult ContentPermissionRequestParent::Recvprompt() {
  mProxy = new nsContentPermissionRequestProxy(this);
  if (NS_FAILED(mProxy->Init(mRequests))) {
    mProxy->Cancel();
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult ContentPermissionRequestParent::RecvNotifyVisibility(
    const bool& aIsVisible) {
  if (!mProxy) {
    return IPC_FAIL_NO_REASON(this);
  }
  mProxy->NotifyVisibility(aIsVisible);
  return IPC_OK();
}

mozilla::ipc::IPCResult ContentPermissionRequestParent::RecvDestroy() {
  Unused << PContentPermissionRequestParent::Send__delete__(this);
  return IPC_OK();
}

void ContentPermissionRequestParent::ActorDestroy(ActorDestroyReason why) {
  if (mProxy) {
    mProxy->OnParentDestroyed();
  }
}

bool ContentPermissionRequestParent::IsBeingDestroyed() {
  // When ContentParent::MarkAsDead() is called, we are being destroyed.
  // It's unsafe to send out any message now.
  ContentParent* contentParent = static_cast<ContentParent*>(Manager());
  return !contentParent->IsAlive();
}

NS_IMPL_ISUPPORTS(ContentPermissionType, nsIContentPermissionType)

ContentPermissionType::ContentPermissionType(
    const nsACString& aType, const nsTArray<nsString>& aOptions) {
  mType = aType;
  mOptions = aOptions;
}

ContentPermissionType::~ContentPermissionType() {}

NS_IMETHODIMP
ContentPermissionType::GetType(nsACString& aType) {
  aType = mType;
  return NS_OK;
}

NS_IMETHODIMP
ContentPermissionType::GetOptions(nsIArray** aOptions) {
  NS_ENSURE_ARG_POINTER(aOptions);

  *aOptions = nullptr;

  nsresult rv;
  nsCOMPtr<nsIMutableArray> options =
      do_CreateInstance(NS_ARRAY_CONTRACTID, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  // copy options into JS array
  for (uint32_t i = 0; i < mOptions.Length(); ++i) {
    nsCOMPtr<nsISupportsString> isupportsString =
        do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = isupportsString->SetData(mOptions[i]);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = options->AppendElement(isupportsString);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  options.forget(aOptions);
  return NS_OK;
}

// nsContentPermissionUtils

/* static */
uint32_t nsContentPermissionUtils::ConvertPermissionRequestToArray(
    nsTArray<PermissionRequest>& aSrcArray, nsIMutableArray* aDesArray) {
  uint32_t len = aSrcArray.Length();
  for (uint32_t i = 0; i < len; i++) {
    RefPtr<ContentPermissionType> cpt =
        new ContentPermissionType(aSrcArray[i].type(), aSrcArray[i].options());
    aDesArray->AppendElement(cpt);
  }
  return len;
}

/* static */
uint32_t nsContentPermissionUtils::ConvertArrayToPermissionRequest(
    nsIArray* aSrcArray, nsTArray<PermissionRequest>& aDesArray) {
  uint32_t len = 0;
  aSrcArray->GetLength(&len);
  for (uint32_t i = 0; i < len; i++) {
    nsCOMPtr<nsIContentPermissionType> cpt = do_QueryElementAt(aSrcArray, i);
    nsAutoCString type;
    cpt->GetType(type);

    nsCOMPtr<nsIArray> optionArray;
    cpt->GetOptions(getter_AddRefs(optionArray));
    uint32_t optionsLength = 0;
    if (optionArray) {
      optionArray->GetLength(&optionsLength);
    }
    nsTArray<nsString> options;
    for (uint32_t j = 0; j < optionsLength; ++j) {
      nsCOMPtr<nsISupportsString> isupportsString =
          do_QueryElementAt(optionArray, j);
      if (isupportsString) {
        nsString option;
        isupportsString->GetData(option);
        options.AppendElement(option);
      }
    }

    aDesArray.AppendElement(PermissionRequest(type, options));
  }
  return len;
}

static std::map<PContentPermissionRequestParent*, TabId>&
ContentPermissionRequestParentMap() {
  MOZ_ASSERT(NS_IsMainThread());
  static std::map<PContentPermissionRequestParent*, TabId>
      sPermissionRequestParentMap;
  return sPermissionRequestParentMap;
}

static std::map<PContentPermissionRequestChild*, TabId>&
ContentPermissionRequestChildMap() {
  MOZ_ASSERT(NS_IsMainThread());
  static std::map<PContentPermissionRequestChild*, TabId>
      sPermissionRequestChildMap;
  return sPermissionRequestChildMap;
}

/* static */
nsresult nsContentPermissionUtils::CreatePermissionArray(
    const nsACString& aType, const nsTArray<nsString>& aOptions,
    nsIArray** aTypesArray) {
  nsCOMPtr<nsIMutableArray> types = do_CreateInstance(NS_ARRAY_CONTRACTID);
  RefPtr<ContentPermissionType> permType =
      new ContentPermissionType(aType, aOptions);
  types->AppendElement(permType);
  types.forget(aTypesArray);

  return NS_OK;
}

/* static */
PContentPermissionRequestParent*
nsContentPermissionUtils::CreateContentPermissionRequestParent(
    const nsTArray<PermissionRequest>& aRequests, Element* aElement,
    const IPC::Principal& aPrincipal, const IPC::Principal& aTopLevelPrincipal,
    const bool aIsHandlingUserInput, const TabId& aTabId) {
  PContentPermissionRequestParent* parent = new ContentPermissionRequestParent(
      aRequests, aElement, aPrincipal, aTopLevelPrincipal,
      aIsHandlingUserInput);
  ContentPermissionRequestParentMap()[parent] = aTabId;

  return parent;
}

/* static */
nsresult nsContentPermissionUtils::AskPermission(
    nsIContentPermissionRequest* aRequest, nsPIDOMWindowInner* aWindow) {
  NS_ENSURE_STATE(aWindow && aWindow->IsCurrentInnerWindow());

  // for content process
  if (XRE_IsContentProcess()) {
    RefPtr<RemotePermissionRequest> req =
        new RemotePermissionRequest(aRequest, aWindow);

    MOZ_ASSERT(NS_IsMainThread());  // IPC can only be execute on main thread.

    TabChild* child = TabChild::GetFrom(aWindow->GetDocShell());
    NS_ENSURE_TRUE(child, NS_ERROR_FAILURE);

    nsCOMPtr<nsIArray> typeArray;
    nsresult rv = aRequest->GetTypes(getter_AddRefs(typeArray));
    NS_ENSURE_SUCCESS(rv, rv);

    nsTArray<PermissionRequest> permArray;
    ConvertArrayToPermissionRequest(typeArray, permArray);

    nsCOMPtr<nsIPrincipal> principal;
    rv = aRequest->GetPrincipal(getter_AddRefs(principal));
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIPrincipal> topLevelPrincipal;
    rv = aRequest->GetTopLevelPrincipal(getter_AddRefs(topLevelPrincipal));
    NS_ENSURE_SUCCESS(rv, rv);

    bool isHandlingUserInput;
    rv = aRequest->GetIsHandlingUserInput(&isHandlingUserInput);
    NS_ENSURE_SUCCESS(rv, rv);

    ContentChild::GetSingleton()->SetEventTargetForActor(
        req, aWindow->EventTargetFor(TaskCategory::Other));

    req->IPDLAddRef();
    ContentChild::GetSingleton()->SendPContentPermissionRequestConstructor(
        req, permArray, IPC::Principal(principal),
        IPC::Principal(topLevelPrincipal), isHandlingUserInput,
        child->GetTabId());
    ContentPermissionRequestChildMap()[req.get()] = child->GetTabId();

    req->Sendprompt();
    return NS_OK;
  }

  // for chrome process
  nsCOMPtr<nsIContentPermissionPrompt> prompt =
      do_GetService(NS_CONTENT_PERMISSION_PROMPT_CONTRACTID);
  if (prompt) {
    if (NS_FAILED(prompt->Prompt(aRequest))) {
      return NS_ERROR_FAILURE;
    }
  }
  return NS_OK;
}

/* static */
nsTArray<PContentPermissionRequestParent*>
nsContentPermissionUtils::GetContentPermissionRequestParentById(
    const TabId& aTabId) {
  nsTArray<PContentPermissionRequestParent*> parentArray;
  for (auto& it : ContentPermissionRequestParentMap()) {
    if (it.second == aTabId) {
      parentArray.AppendElement(it.first);
    }
  }

  return parentArray;
}

/* static */
void nsContentPermissionUtils::NotifyRemoveContentPermissionRequestParent(
    PContentPermissionRequestParent* aParent) {
  auto it = ContentPermissionRequestParentMap().find(aParent);
  MOZ_ASSERT(it != ContentPermissionRequestParentMap().end());

  ContentPermissionRequestParentMap().erase(it);
}

/* static */
nsTArray<PContentPermissionRequestChild*>
nsContentPermissionUtils::GetContentPermissionRequestChildById(
    const TabId& aTabId) {
  nsTArray<PContentPermissionRequestChild*> childArray;
  for (auto& it : ContentPermissionRequestChildMap()) {
    if (it.second == aTabId) {
      childArray.AppendElement(it.first);
    }
  }

  return childArray;
}

/* static */
void nsContentPermissionUtils::NotifyRemoveContentPermissionRequestChild(
    PContentPermissionRequestChild* aChild) {
  auto it = ContentPermissionRequestChildMap().find(aChild);
  MOZ_ASSERT(it != ContentPermissionRequestChildMap().end());

  ContentPermissionRequestChildMap().erase(it);
}

NS_IMPL_ISUPPORTS(nsContentPermissionRequester, nsIContentPermissionRequester)

nsContentPermissionRequester::nsContentPermissionRequester(
    nsPIDOMWindowInner* aWindow)
    : mWindow(do_GetWeakReference(aWindow)),
      mListener(new VisibilityChangeListener(aWindow)) {}

nsContentPermissionRequester::~nsContentPermissionRequester() {
  mListener->RemoveListener();
  mListener = nullptr;
}

NS_IMETHODIMP
nsContentPermissionRequester::GetVisibility(
    nsIContentPermissionRequestCallback* aCallback) {
  NS_ENSURE_ARG_POINTER(aCallback);

  nsCOMPtr<nsPIDOMWindowInner> window = do_QueryReferent(mWindow);
  if (!window) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsIDocShell> docshell = window->GetDocShell();
  if (!docshell) {
    return NS_ERROR_FAILURE;
  }

  bool isActive = false;
  docshell->GetIsActive(&isActive);
  aCallback->NotifyVisibility(isActive);
  return NS_OK;
}

NS_IMETHODIMP
nsContentPermissionRequester::SetOnVisibilityChange(
    nsIContentPermissionRequestCallback* aCallback) {
  mListener->SetCallback(aCallback);

  if (!aCallback) {
    mListener->RemoveListener();
  }

  return NS_OK;
}

NS_IMETHODIMP
nsContentPermissionRequester::GetOnVisibilityChange(
    nsIContentPermissionRequestCallback** aCallback) {
  NS_ENSURE_ARG_POINTER(aCallback);

  nsCOMPtr<nsIContentPermissionRequestCallback> callback =
      mListener->GetCallback();
  callback.forget(aCallback);
  return NS_OK;
}

static nsIPrincipal* GetTopLevelPrincipal(nsPIDOMWindowInner* aWindow) {
  MOZ_ASSERT(aWindow);

  nsPIDOMWindowOuter* top = aWindow->GetScriptableTop();
  if (!top) {
    return nullptr;
  }

  nsPIDOMWindowInner* inner = top->GetCurrentInnerWindow();
  if (!inner) {
    return nullptr;
  }

  return nsGlobalWindowInner::Cast(inner)->GetPrincipal();
}

NS_IMPL_CYCLE_COLLECTION(ContentPermissionRequestBase, mPrincipal,
                         mTopLevelPrincipal, mWindow)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ContentPermissionRequestBase)
  NS_INTERFACE_MAP_ENTRY_CONCRETE(nsISupports)
  NS_INTERFACE_MAP_ENTRY_CONCRETE(nsIContentPermissionRequest)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(ContentPermissionRequestBase)
NS_IMPL_CYCLE_COLLECTING_RELEASE(ContentPermissionRequestBase)

ContentPermissionRequestBase::ContentPermissionRequestBase(
    nsIPrincipal* aPrincipal, nsPIDOMWindowInner* aWindow,
    const nsACString& aPrefName, const nsACString& aType)
    : mPrincipal(aPrincipal),
      mTopLevelPrincipal(aWindow ? ::GetTopLevelPrincipal(aWindow) : nullptr),
      mWindow(aWindow),
      mRequester(aWindow ? new nsContentPermissionRequester(aWindow) : nullptr),
      mPrefName(aPrefName),
      mType(aType),
      mIsHandlingUserInput(EventStateManager::IsHandlingUserInput()) {}

NS_IMETHODIMP
ContentPermissionRequestBase::GetPrincipal(
    nsIPrincipal** aRequestingPrincipal) {
  NS_IF_ADDREF(*aRequestingPrincipal = mPrincipal);
  return NS_OK;
}

NS_IMETHODIMP
ContentPermissionRequestBase::GetTopLevelPrincipal(
    nsIPrincipal** aRequestingPrincipal) {
  NS_IF_ADDREF(*aRequestingPrincipal = mTopLevelPrincipal);
  return NS_OK;
}

NS_IMETHODIMP
ContentPermissionRequestBase::GetWindow(mozIDOMWindow** aRequestingWindow) {
  NS_IF_ADDREF(*aRequestingWindow = mWindow);
  return NS_OK;
}

NS_IMETHODIMP
ContentPermissionRequestBase::GetElement(Element** aElement) {
  NS_ENSURE_ARG_POINTER(aElement);
  *aElement = nullptr;
  return NS_OK;
}

NS_IMETHODIMP
ContentPermissionRequestBase::GetIsHandlingUserInput(
    bool* aIsHandlingUserInput) {
  *aIsHandlingUserInput = mIsHandlingUserInput;
  return NS_OK;
}

NS_IMETHODIMP
ContentPermissionRequestBase::GetRequester(
    nsIContentPermissionRequester** aRequester) {
  NS_ENSURE_ARG_POINTER(aRequester);

  nsCOMPtr<nsIContentPermissionRequester> requester = mRequester;
  requester.forget(aRequester);
  return NS_OK;
}

NS_IMETHODIMP
ContentPermissionRequestBase::GetTypes(nsIArray** aTypes) {
  nsTArray<nsString> emptyOptions;
  return nsContentPermissionUtils::CreatePermissionArray(mType, emptyOptions,
                                                         aTypes);
}

ContentPermissionRequestBase::PromptResult
ContentPermissionRequestBase::CheckPromptPrefs() {
  MOZ_ASSERT(!mPrefName.IsEmpty(),
             "This derived class must support checking pref types");

  nsAutoCString prefName(mPrefName);
  prefName.AppendLiteral(".prompt.testing");
  if (Preferences::GetBool(PromiseFlatCString(prefName).get(), false)) {
    prefName.AppendLiteral(".allow");
    if (Preferences::GetBool(PromiseFlatCString(prefName).get(), true)) {
      return PromptResult::Granted;
    }
    return PromptResult::Denied;
  }

  return PromptResult::Pending;
}

nsresult ContentPermissionRequestBase::ShowPrompt(
    ContentPermissionRequestBase::PromptResult& aResult) {
  aResult = CheckPromptPrefs();

  if (aResult != PromptResult::Pending) {
    return NS_OK;
  }

  return nsContentPermissionUtils::AskPermission(this, mWindow);
}

class RequestPromptEvent : public Runnable {
 public:
  RequestPromptEvent(ContentPermissionRequestBase* aRequest,
                     nsPIDOMWindowInner* aWindow)
      : mozilla::Runnable("RequestPromptEvent"),
        mRequest(aRequest),
        mWindow(aWindow) {}

  NS_IMETHOD Run() override {
    nsContentPermissionUtils::AskPermission(mRequest, mWindow);
    return NS_OK;
  }

 private:
  RefPtr<ContentPermissionRequestBase> mRequest;
  nsCOMPtr<nsPIDOMWindowInner> mWindow;
};

class RequestAllowEvent : public Runnable {
 public:
  RequestAllowEvent(bool allow, ContentPermissionRequestBase* request)
      : mozilla::Runnable("RequestAllowEvent"),
        mAllow(allow),
        mRequest(request) {}

  NS_IMETHOD Run() override {
    if (mAllow) {
      mRequest->Allow(JS::UndefinedHandleValue);
    } else {
      mRequest->Cancel();
    }
    return NS_OK;
  }

 private:
  bool mAllow;
  RefPtr<ContentPermissionRequestBase> mRequest;
};

void ContentPermissionRequestBase::RequestDelayedTask(
    nsIEventTarget* aTarget,
    ContentPermissionRequestBase::DelayedTaskType aType) {
  nsCOMPtr<nsIRunnable> r;
  switch (aType) {
    case DelayedTaskType::Allow:
      r = new RequestAllowEvent(true, this);
      break;
    case DelayedTaskType::Deny:
      r = new RequestAllowEvent(false, this);
      break;
    default:
      r = new RequestPromptEvent(this, mWindow);
      break;
  }

  aTarget->Dispatch(r.forget());
}

nsresult TranslateChoices(
    JS::HandleValue aChoices,
    const nsTArray<PermissionRequest>& aPermissionRequests,
    nsTArray<PermissionChoice>& aTranslatedChoices) {
  if (aChoices.isNullOrUndefined()) {
    // No choice is specified.
  } else if (aChoices.isObject()) {
    // Iterate through all permission types.
    for (uint32_t i = 0; i < aPermissionRequests.Length(); ++i) {
      nsCString type = aPermissionRequests[i].type();

      JS::Rooted<JSObject*> obj(RootingCx(), &aChoices.toObject());
      // People really shouldn't be passing WindowProxy or Location
      // objects for the choices here.
      obj = js::CheckedUnwrapStatic(obj);
      if (!obj) {
        return NS_ERROR_FAILURE;
      }

      AutoJSAPI jsapi;
      jsapi.Init();

      JSContext* cx = jsapi.cx();
      JSAutoRealm ar(cx, obj);

      JS::Rooted<JS::Value> val(cx);

      if (!JS_GetProperty(cx, obj, type.BeginReading(), &val) ||
          !val.isString()) {
        // no setting for the permission type, clear exception and skip it
        jsapi.ClearException();
      } else {
        nsAutoJSString choice;
        if (!choice.init(cx, val)) {
          jsapi.ClearException();
          return NS_ERROR_FAILURE;
        }
        aTranslatedChoices.AppendElement(PermissionChoice(type, choice));
      }
    }
  } else {
    MOZ_ASSERT(false, "SelectedChoices should be undefined or an JS object");
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

}  // namespace dom
}  // namespace mozilla

NS_IMPL_ISUPPORTS(
    nsContentPermissionRequestProxy::nsContentPermissionRequesterProxy,
    nsIContentPermissionRequester)

NS_IMETHODIMP
nsContentPermissionRequestProxy::nsContentPermissionRequesterProxy ::
    GetVisibility(nsIContentPermissionRequestCallback* aCallback) {
  NS_ENSURE_ARG_POINTER(aCallback);

  mGetCallback = aCallback;
  mWaitGettingResult = true;
  Unused << mParent->SendGetVisibility();
  return NS_OK;
}

NS_IMETHODIMP
nsContentPermissionRequestProxy::nsContentPermissionRequesterProxy ::
    SetOnVisibilityChange(nsIContentPermissionRequestCallback* aCallback) {
  mOnChangeCallback = aCallback;
  return NS_OK;
}

NS_IMETHODIMP
nsContentPermissionRequestProxy::nsContentPermissionRequesterProxy ::
    GetOnVisibilityChange(nsIContentPermissionRequestCallback** aCallback) {
  NS_ENSURE_ARG_POINTER(aCallback);

  nsCOMPtr<nsIContentPermissionRequestCallback> callback = mOnChangeCallback;
  callback.forget(aCallback);
  return NS_OK;
}

void nsContentPermissionRequestProxy::nsContentPermissionRequesterProxy ::
    NotifyVisibilityResult(const bool& aIsVisible) {
  if (mWaitGettingResult) {
    MOZ_ASSERT(mGetCallback);
    mWaitGettingResult = false;
    mGetCallback->NotifyVisibility(aIsVisible);
    return;
  }

  if (mOnChangeCallback) {
    mOnChangeCallback->NotifyVisibility(aIsVisible);
  }
}

nsContentPermissionRequestProxy::nsContentPermissionRequestProxy(
    ContentPermissionRequestParent* parent)
    : mParent(parent) {
  NS_ASSERTION(mParent, "null parent");
}

nsContentPermissionRequestProxy::~nsContentPermissionRequestProxy() = default;

nsresult nsContentPermissionRequestProxy::Init(
    const nsTArray<PermissionRequest>& requests) {
  mPermissionRequests = requests;
  mRequester = new nsContentPermissionRequesterProxy(mParent);

  nsCOMPtr<nsIContentPermissionPrompt> prompt =
      do_GetService(NS_CONTENT_PERMISSION_PROMPT_CONTRACTID);
  if (!prompt) {
    return NS_ERROR_FAILURE;
  }

  prompt->Prompt(this);
  return NS_OK;
}

void nsContentPermissionRequestProxy::OnParentDestroyed() {
  mRequester = nullptr;
  mParent = nullptr;
}

NS_IMPL_ISUPPORTS(nsContentPermissionRequestProxy, nsIContentPermissionRequest)

NS_IMETHODIMP
nsContentPermissionRequestProxy::GetTypes(nsIArray** aTypes) {
  nsCOMPtr<nsIMutableArray> types = do_CreateInstance(NS_ARRAY_CONTRACTID);
  if (mozilla::dom::nsContentPermissionUtils::ConvertPermissionRequestToArray(
          mPermissionRequests, types)) {
    types.forget(aTypes);
    return NS_OK;
  }
  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsContentPermissionRequestProxy::GetWindow(mozIDOMWindow** aRequestingWindow) {
  NS_ENSURE_ARG_POINTER(aRequestingWindow);
  *aRequestingWindow = nullptr;  // ipc doesn't have a window
  return NS_OK;
}

NS_IMETHODIMP
nsContentPermissionRequestProxy::GetPrincipal(
    nsIPrincipal** aRequestingPrincipal) {
  NS_ENSURE_ARG_POINTER(aRequestingPrincipal);
  if (mParent == nullptr) {
    return NS_ERROR_FAILURE;
  }

  NS_ADDREF(*aRequestingPrincipal = mParent->mPrincipal);
  return NS_OK;
}

NS_IMETHODIMP
nsContentPermissionRequestProxy::GetTopLevelPrincipal(
    nsIPrincipal** aRequestingPrincipal) {
  NS_ENSURE_ARG_POINTER(aRequestingPrincipal);
  if (mParent == nullptr) {
    return NS_ERROR_FAILURE;
  }

  NS_ADDREF(*aRequestingPrincipal = mParent->mTopLevelPrincipal);
  return NS_OK;
}

NS_IMETHODIMP
nsContentPermissionRequestProxy::GetElement(Element** aRequestingElement) {
  NS_ENSURE_ARG_POINTER(aRequestingElement);
  if (mParent == nullptr) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<Element> elem = mParent->mElement;
  elem.forget(aRequestingElement);
  return NS_OK;
}

NS_IMETHODIMP
nsContentPermissionRequestProxy::GetIsHandlingUserInput(
    bool* aIsHandlingUserInput) {
  NS_ENSURE_ARG_POINTER(aIsHandlingUserInput);
  if (mParent == nullptr) {
    return NS_ERROR_FAILURE;
  }
  *aIsHandlingUserInput = mParent->mIsHandlingUserInput;
  return NS_OK;
}

NS_IMETHODIMP
nsContentPermissionRequestProxy::Cancel() {
  if (mParent == nullptr) {
    return NS_ERROR_FAILURE;
  }

  // Don't send out the delete message when the managing protocol (PBrowser) is
  // being destroyed and PContentPermissionRequest will soon be.
  if (mParent->IsBeingDestroyed()) {
    return NS_ERROR_FAILURE;
  }

  nsTArray<PermissionChoice> emptyChoices;

  Unused << mParent->SendNotifyResult(false, emptyChoices);
  return NS_OK;
}

NS_IMETHODIMP
nsContentPermissionRequestProxy::Allow(JS::HandleValue aChoices) {
  if (mParent == nullptr) {
    return NS_ERROR_FAILURE;
  }

  // Don't send out the delete message when the managing protocol (PBrowser) is
  // being destroyed and PContentPermissionRequest will soon be.
  if (mParent->IsBeingDestroyed()) {
    return NS_ERROR_FAILURE;
  }

  nsTArray<PermissionChoice> choices;
  nsresult rv = TranslateChoices(aChoices, mPermissionRequests, choices);
  if (NS_FAILED(rv)) {
    return rv;
  }

  Unused << mParent->SendNotifyResult(true, choices);
  return NS_OK;
}

void nsContentPermissionRequestProxy::NotifyVisibility(const bool& aIsVisible) {
  MOZ_ASSERT(mRequester);

  mRequester->NotifyVisibilityResult(aIsVisible);
}

NS_IMETHODIMP
nsContentPermissionRequestProxy::GetRequester(
    nsIContentPermissionRequester** aRequester) {
  NS_ENSURE_ARG_POINTER(aRequester);

  RefPtr<nsContentPermissionRequesterProxy> requester = mRequester;
  requester.forget(aRequester);
  return NS_OK;
}

// RemotePermissionRequest

NS_IMPL_ISUPPORTS(RemotePermissionRequest, nsIContentPermissionRequestCallback);

RemotePermissionRequest::RemotePermissionRequest(
    nsIContentPermissionRequest* aRequest, nsPIDOMWindowInner* aWindow)
    : mRequest(aRequest), mWindow(aWindow), mIPCOpen(false), mDestroyed(false) {
  mListener = new VisibilityChangeListener(mWindow);
  mListener->SetCallback(this);
}

RemotePermissionRequest::~RemotePermissionRequest() {
  MOZ_ASSERT(
      !mIPCOpen,
      "Protocol must not be open when RemotePermissionRequest is destroyed.");
}

void RemotePermissionRequest::DoCancel() {
  NS_ASSERTION(mRequest, "We need a request");
  mRequest->Cancel();
}

void RemotePermissionRequest::DoAllow(JS::HandleValue aChoices) {
  NS_ASSERTION(mRequest, "We need a request");
  mRequest->Allow(aChoices);
}

// PContentPermissionRequestChild
mozilla::ipc::IPCResult RemotePermissionRequest::RecvNotifyResult(
    const bool& aAllow, InfallibleTArray<PermissionChoice>&& aChoices) {
  Destroy();

  if (aAllow && mWindow->IsCurrentInnerWindow()) {
    // Use 'undefined' if no choice is provided.
    if (aChoices.IsEmpty()) {
      DoAllow(JS::UndefinedHandleValue);
      return IPC_OK();
    }

    // Convert choices to a JS val if any.
    // {"type1": "choice1", "type2": "choiceA"}
    AutoJSAPI jsapi;
    if (NS_WARN_IF(!jsapi.Init(mWindow))) {
      return IPC_OK();  // This is not an IPC error.
    }

    JSContext* cx = jsapi.cx();
    JS::Rooted<JSObject*> obj(cx);
    obj = JS_NewPlainObject(cx);
    for (uint32_t i = 0; i < aChoices.Length(); ++i) {
      const nsString& choice = aChoices[i].choice();
      const nsCString& type = aChoices[i].type();
      JS::Rooted<JSString*> jChoice(
          cx, JS_NewUCStringCopyN(cx, choice.get(), choice.Length()));
      JS::Rooted<JS::Value> vChoice(cx, StringValue(jChoice));
      if (!JS_SetProperty(cx, obj, type.get(), vChoice)) {
        return IPC_FAIL_NO_REASON(this);
      }
    }
    JS::RootedValue val(cx, JS::ObjectValue(*obj));
    DoAllow(val);
  } else {
    DoCancel();
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult RemotePermissionRequest::RecvGetVisibility() {
  nsCOMPtr<nsIDocShell> docshell = mWindow->GetDocShell();
  if (!docshell) {
    return IPC_FAIL_NO_REASON(this);
  }

  bool isActive = false;
  docshell->GetIsActive(&isActive);
  Unused << SendNotifyVisibility(isActive);
  return IPC_OK();
}

void RemotePermissionRequest::Destroy() {
  if (!IPCOpen()) {
    return;
  }
  Unused << this->SendDestroy();
  mListener->RemoveListener();
  mListener = nullptr;
  mDestroyed = true;
}

NS_IMETHODIMP
RemotePermissionRequest::NotifyVisibility(bool isVisible) {
  if (!IPCOpen()) {
    return NS_OK;
  }

  Unused << SendNotifyVisibility(isVisible);
  return NS_OK;
}