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