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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/extensions/api/settings_private/settings_private_event_router.h"
#include <utility>
#include <vector>
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/task/single_thread_task_runner.h"
#include "build/build_config.h"
#include "build/chromeos_buildflags.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/extensions/api/settings_private/generated_prefs.h"
#include "chrome/browser/extensions/api/settings_private/generated_prefs_factory.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/extensions/api/settings_private.h"
#include "components/prefs/pref_service.h"
#include "content/public/browser/browser_context.h"
namespace extensions {
SettingsPrivateEventRouter::SettingsPrivateEventRouter(
content::BrowserContext* context)
: context_(context) {
Profile* profile = Profile::FromBrowserContext(context_);
prefs_util_ = std::make_unique<PrefsUtil>(profile);
user_prefs_registrar_.Init(profile->GetPrefs());
local_state_registrar_.Init(g_browser_process->local_state());
EventRouter::Get(context_)->RegisterObserver(
this, api::settings_private::OnPrefsChanged::kEventName);
StartOrStopListeningForPrefsChanges();
}
SettingsPrivateEventRouter::~SettingsPrivateEventRouter() {
DCHECK(!listening_);
}
void SettingsPrivateEventRouter::OnGeneratedPrefChanged(
const std::string& pref_name) {
OnPreferenceChanged(pref_name);
}
void SettingsPrivateEventRouter::Shutdown() {
EventRouter::Get(context_)->UnregisterObserver(this);
if (listening_) {
#if BUILDFLAG(IS_CHROMEOS)
cros_settings_subscription_map_.clear();
#endif
const PrefsUtil::TypedPrefMap& keys = prefs_util_->GetAllowlistedKeys();
settings_private::GeneratedPrefs* generated_prefs =
settings_private::GeneratedPrefsFactory::GetForBrowserContext(context_);
for (const auto& it : keys) {
if (generated_prefs && generated_prefs->HasPref(it.first))
generated_prefs->RemoveObserver(it.first, this);
else if (!prefs_util_->IsCrosSetting(it.first))
FindRegistrarForPref(it.first)->Remove(it.first);
}
}
listening_ = false;
}
void SettingsPrivateEventRouter::OnListenerAdded(
const EventListenerInfo& details) {
// Start listening to events from the PrefChangeRegistrars.
StartOrStopListeningForPrefsChanges();
}
void SettingsPrivateEventRouter::OnListenerRemoved(
const EventListenerInfo& details) {
// Stop listening to events from the PrefChangeRegistrars if there are no
// more listeners.
StartOrStopListeningForPrefsChanges();
}
PrefChangeRegistrar* SettingsPrivateEventRouter::FindRegistrarForPref(
const std::string& pref_name) {
Profile* profile = Profile::FromBrowserContext(context_);
if (prefs_util_->FindServiceForPref(pref_name) == profile->GetPrefs()) {
return &user_prefs_registrar_;
}
return &local_state_registrar_;
}
void SettingsPrivateEventRouter::StartOrStopListeningForPrefsChanges() {
DCHECK(prefs_util_);
EventRouter* event_router = EventRouter::Get(context_);
bool should_listen = event_router->HasEventListener(
api::settings_private::OnPrefsChanged::kEventName);
settings_private::GeneratedPrefs* generated_prefs =
settings_private::GeneratedPrefsFactory::GetForBrowserContext(context_);
if (should_listen && !listening_) {
const PrefsUtil::TypedPrefMap& keys = prefs_util_->GetAllowlistedKeys();
for (const auto& it : keys) {
std::string pref_name = it.first;
if (prefs_util_->IsCrosSetting(pref_name)) {
#if BUILDFLAG(IS_CHROMEOS)
base::CallbackListSubscription subscription =
ash::CrosSettings::Get()->AddSettingsObserver(
pref_name.c_str(),
base::BindRepeating(
&SettingsPrivateEventRouter::OnPreferenceChanged,
base::Unretained(this), pref_name));
cros_settings_subscription_map_.insert(
make_pair(pref_name, std::move(subscription)));
#endif
} else if (generated_prefs && generated_prefs->HasPref(pref_name)) {
generated_prefs->AddObserver(pref_name, this);
} else {
FindRegistrarForPref(it.first)->Add(
pref_name, base::BindRepeating(
&SettingsPrivateEventRouter::OnPreferenceChanged,
base::Unretained(this)));
}
}
} else if (!should_listen && listening_) {
const PrefsUtil::TypedPrefMap& keys = prefs_util_->GetAllowlistedKeys();
for (const auto& it : keys) {
if (prefs_util_->IsCrosSetting(it.first)) {
#if BUILDFLAG(IS_CHROMEOS)
cros_settings_subscription_map_.erase(it.first);
#endif
} else if (generated_prefs && generated_prefs->HasPref(it.first)) {
generated_prefs->RemoveObserver(it.first, this);
} else {
FindRegistrarForPref(it.first)->Remove(it.first);
}
}
}
listening_ = should_listen;
}
void SettingsPrivateEventRouter::OnPreferenceChanged(
const std::string& pref_name) {
// This posts an asynchronous task to ensure that all pref stores are updated,
// as |prefs_util_->GetPref()| relies on this information to determine if a
// preference is controlled by e.g. extensions.
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindOnce(&SettingsPrivateEventRouter::SendPrefChange,
weak_ptr_factory_.GetWeakPtr(), pref_name));
}
void SettingsPrivateEventRouter::SendPrefChange(const std::string& pref_name) {
EventRouter* event_router = EventRouter::Get(context_);
if (!event_router->HasEventListener(
api::settings_private::OnPrefsChanged::kEventName)) {
return;
}
std::optional<api::settings_private::PrefObject> pref_object =
prefs_util_->GetPref(pref_name);
std::vector<api::settings_private::PrefObject> prefs;
if (pref_object)
prefs.push_back(std::move(*pref_object));
auto args(api::settings_private::OnPrefsChanged::Create(prefs));
std::unique_ptr<Event> extension_event =
std::make_unique<Event>(events::SETTINGS_PRIVATE_ON_PREFS_CHANGED,
api::settings_private::OnPrefsChanged::kEventName,
std::move(args), context_);
event_router->BroadcastEvent(std::move(extension_event));
}
std::unique_ptr<SettingsPrivateEventRouter> SettingsPrivateEventRouter::Create(
content::BrowserContext* context) {
return std::make_unique<SettingsPrivateEventRouter>(context);
}
} // namespace extensions
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