mirror of
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132 lines
3.8 KiB
C++
132 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "PermissionObserver.h"
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#include "mozilla/dom/PermissionStatus.h"
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#include "mozilla/dom/WindowGlobalChild.h"
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#include "mozilla/Services.h"
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#include "mozilla/UniquePtr.h"
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#include "nsIObserverService.h"
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#include "nsIPermission.h"
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#include "PermissionUtils.h"
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namespace mozilla::dom {
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namespace {
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PermissionObserver* gInstance = nullptr;
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} // namespace
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NS_IMPL_ISUPPORTS(PermissionObserver, nsIObserver, nsISupportsWeakReference)
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PermissionObserver::PermissionObserver() { MOZ_ASSERT(!gInstance); }
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PermissionObserver::~PermissionObserver() {
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MOZ_ASSERT(mSinks.IsEmpty());
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MOZ_ASSERT(gInstance == this);
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gInstance = nullptr;
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}
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/* static */
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already_AddRefed<PermissionObserver> PermissionObserver::GetInstance() {
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RefPtr<PermissionObserver> instance = gInstance;
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if (!instance) {
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instance = new PermissionObserver();
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nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
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if (NS_WARN_IF(!obs)) {
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return nullptr;
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}
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nsresult rv = obs->AddObserver(instance, "perm-changed", true);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return nullptr;
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}
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rv = obs->AddObserver(instance, "perm-changed-notify-only", true);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return nullptr;
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}
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gInstance = instance;
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}
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return instance.forget();
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}
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void PermissionObserver::AddSink(PermissionStatus* aSink) {
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MOZ_ASSERT(aSink);
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MOZ_ASSERT(!mSinks.Contains(aSink));
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mSinks.AppendElement(aSink);
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}
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void PermissionObserver::RemoveSink(PermissionStatus* aSink) {
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MOZ_ASSERT(aSink);
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MOZ_ASSERT(mSinks.Contains(aSink));
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mSinks.RemoveElement(aSink);
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}
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NS_IMETHODIMP
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PermissionObserver::Observe(nsISupports* aSubject, const char* aTopic,
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const char16_t* aData) {
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MOZ_ASSERT(!strcmp(aTopic, "perm-changed") ||
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!strcmp(aTopic, "perm-changed-notify-only"));
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if (mSinks.IsEmpty()) {
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return NS_OK;
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}
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nsCOMPtr<nsIPermission> perm = nullptr;
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nsCOMPtr<nsPIDOMWindowInner> innerWindow = nullptr;
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nsAutoCString type;
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if (!strcmp(aTopic, "perm-changed")) {
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perm = do_QueryInterface(aSubject);
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if (!perm) {
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return NS_OK;
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}
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perm->GetType(type);
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} else if (!strcmp(aTopic, "perm-changed-notify-only")) {
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innerWindow = do_QueryInterface(aSubject);
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if (!innerWindow) {
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return NS_OK;
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}
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type = NS_ConvertUTF16toUTF8(aData);
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}
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Maybe<PermissionName> permission = TypeToPermissionName(type);
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if (permission) {
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for (auto* sink : mSinks) {
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if (sink->mName != permission.value()) {
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continue;
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}
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// Check for permissions that are changed for this sink's principal
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// via the "perm-changed" notification. These permissions affect
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// the window the sink (PermissionStatus) is held in directly.
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if (perm && sink->MaybeUpdatedBy(perm)) {
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sink->PermissionChanged();
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}
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// Check for permissions that are changed for this sink's principal
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// via the "perm-changed-notify-only" notification. These permissions
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// affect the window the sink (PermissionStatus) is held in indirectly- if
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// the window is same-party with the secondary key of a permission. For
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// example, a "3rdPartyFrameStorage^https://example.com" permission would
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// return true on these checks where sink is in a window that is same-site
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// with https://example.com.
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if (innerWindow && sink->MaybeUpdatedByNotifyOnly(innerWindow)) {
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sink->PermissionChanged();
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}
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}
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}
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return NS_OK;
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}
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} // namespace mozilla::dom
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