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4369044005
Differential Revision: https://phabricator.services.mozilla.com/D65819 --HG-- extra : moz-landing-system : lando
116 lines
4 KiB
C++
116 lines
4 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "SettingsChangeObserver.h"
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#include "ContentBlockingUserInteraction.h"
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#include "mozilla/Services.h"
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#include "mozilla/Preferences.h"
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#include "nsIObserverService.h"
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#include "nsIPermission.h"
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#include "nsTArray.h"
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using namespace mozilla;
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namespace {
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UniquePtr<nsTArray<SettingsChangeObserver::AntiTrackingSettingsChangedCallback>>
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gSettingsChangedCallbacks;
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}
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NS_IMPL_ISUPPORTS(SettingsChangeObserver, nsIObserver)
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NS_IMETHODIMP SettingsChangeObserver::Observe(nsISupports* aSubject,
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const char* aTopic,
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const char16_t* aData) {
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if (!strcmp(aTopic, "xpcom-shutdown")) {
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nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
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if (obs) {
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obs->RemoveObserver(this, "perm-added");
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obs->RemoveObserver(this, "perm-changed");
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obs->RemoveObserver(this, "perm-cleared");
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obs->RemoveObserver(this, "perm-deleted");
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obs->RemoveObserver(this, "xpcom-shutdown");
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Preferences::UnregisterPrefixCallback(
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SettingsChangeObserver::PrivacyPrefChanged,
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"browser.contentblocking.");
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Preferences::UnregisterPrefixCallback(
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SettingsChangeObserver::PrivacyPrefChanged, "network.cookie.");
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Preferences::UnregisterPrefixCallback(
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SettingsChangeObserver::PrivacyPrefChanged, "privacy.");
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gSettingsChangedCallbacks = nullptr;
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}
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} else {
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nsCOMPtr<nsIPermission> perm = do_QueryInterface(aSubject);
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if (perm) {
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nsAutoCString type;
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nsresult rv = perm->GetType(type);
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if (NS_WARN_IF(NS_FAILED(rv)) || type.Equals(USER_INTERACTION_PERM)) {
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// Ignore failures or notifications that have been sent because of
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// user interactions.
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return NS_OK;
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}
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}
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RunAntiTrackingSettingsChangedCallbacks();
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}
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return NS_OK;
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}
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// static
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void SettingsChangeObserver::PrivacyPrefChanged(const char* aPref,
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void* aClosure) {
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RunAntiTrackingSettingsChangedCallbacks();
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}
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// static
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void SettingsChangeObserver::RunAntiTrackingSettingsChangedCallbacks() {
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if (gSettingsChangedCallbacks) {
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for (auto& callback : *gSettingsChangedCallbacks) {
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callback();
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}
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}
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}
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// static
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void SettingsChangeObserver::OnAntiTrackingSettingsChanged(
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const SettingsChangeObserver::AntiTrackingSettingsChangedCallback&
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aCallback) {
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static bool initialized = false;
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if (!initialized) {
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// It is possible that while we have some data in our cache, something
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// changes in our environment that causes the anti-tracking checks below to
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// change their response. Therefore, we need to clear our cache when we
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// detect a related change.
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Preferences::RegisterPrefixCallback(
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SettingsChangeObserver::PrivacyPrefChanged, "browser.contentblocking.");
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Preferences::RegisterPrefixCallback(
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SettingsChangeObserver::PrivacyPrefChanged, "network.cookie.");
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Preferences::RegisterPrefixCallback(
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SettingsChangeObserver::PrivacyPrefChanged, "privacy.");
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nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
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if (obs) {
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RefPtr<SettingsChangeObserver> observer = new SettingsChangeObserver();
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obs->AddObserver(observer, "perm-added", false);
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obs->AddObserver(observer, "perm-changed", false);
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obs->AddObserver(observer, "perm-cleared", false);
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obs->AddObserver(observer, "perm-deleted", false);
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obs->AddObserver(observer, "xpcom-shutdown", false);
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}
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gSettingsChangedCallbacks =
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MakeUnique<nsTArray<AntiTrackingSettingsChangedCallback>>();
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initialized = true;
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}
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gSettingsChangedCallbacks->AppendElement(aCallback);
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}
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