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// Copyright 2013 The Chromium Authors. All rights reserved.
// 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/preference/chrome_direct_setting_api.h"
#include <utility>
#include "base/bind.h"
#include "base/containers/hash_tables.h"
#include "base/lazy_instance.h"
#include "base/macros.h"
#include "base/strings/stringprintf.h"
#include "chrome/browser/extensions/api/preference/preference_api_constants.h"
#include "chrome/browser/profiles/profile.h"
#include "components/prefs/pref_change_registrar.h"
#include "components/prefs/pref_service.h"
#include "extensions/browser/extension_registry.h"
namespace extensions {
namespace chromedirectsetting {
const char kOnPrefChangeFormat[] =
"types.private.ChromeDirectSetting.%s.onChange";
class PreferenceWhitelist {
public:
PreferenceWhitelist() {
// Note: DO NOT add any setting here that does not have a UI element in
// chrome://settings unless you write a component extension that is always
// installed. Otherwise, users may install your extension, the extension may
// toggle settings, and after the extension has been disabled/uninstalled
// the toggled setting remains in place. See http://crbug.com/164227#c157 .
// The following settings need to be checked and probably removed. See
// http://crbug.com/164227#c157 .
whitelist_.insert("easy_unlock.proximity_required");
}
~PreferenceWhitelist() {}
bool IsPreferenceOnWhitelist(const std::string& pref_key){
return whitelist_.find(pref_key) != whitelist_.end();
}
void RegisterEventListeners(
Profile* profile,
EventRouter::Observer* observer) {
for (base::hash_set<std::string>::iterator iter = whitelist_.begin();
iter != whitelist_.end();
iter++) {
std::string event_name = base::StringPrintf(
kOnPrefChangeFormat,
(*iter).c_str());
EventRouter::Get(profile)->RegisterObserver(observer, event_name);
}
}
void RegisterPropertyListeners(
Profile* profile,
PrefChangeRegistrar* registrar,
const base::Callback<void(const std::string&)>& callback) {
for (base::hash_set<std::string>::iterator iter = whitelist_.begin();
iter != whitelist_.end();
iter++) {
const char* pref_key = (*iter).c_str();
std::string event_name = base::StringPrintf(
kOnPrefChangeFormat,
pref_key);
registrar->Add(pref_key, callback);
}
}
private:
base::hash_set<std::string> whitelist_;
DISALLOW_COPY_AND_ASSIGN(PreferenceWhitelist);
};
base::LazyInstance<PreferenceWhitelist> preference_whitelist =
LAZY_INSTANCE_INITIALIZER;
static base::LazyInstance<
BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI> > g_factory =
LAZY_INSTANCE_INITIALIZER;
ChromeDirectSettingAPI::ChromeDirectSettingAPI(content::BrowserContext* context)
: profile_(Profile::FromBrowserContext(context)) {
preference_whitelist.Get().RegisterEventListeners(profile_, this);
}
ChromeDirectSettingAPI::~ChromeDirectSettingAPI() {}
// KeyedService implementation.
void ChromeDirectSettingAPI::Shutdown() {}
// BrowserContextKeyedAPI implementation.
BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI>*
ChromeDirectSettingAPI::GetFactoryInstance() {
return g_factory.Pointer();
}
// EventRouter::Observer implementation.
void ChromeDirectSettingAPI::OnListenerAdded(const EventListenerInfo& details) {
EventRouter::Get(profile_)->UnregisterObserver(this);
registrar_.Init(profile_->GetPrefs());
preference_whitelist.Get().RegisterPropertyListeners(
profile_,
®istrar_,
base::Bind(&ChromeDirectSettingAPI::OnPrefChanged,
base::Unretained(this),
registrar_.prefs()));
}
bool ChromeDirectSettingAPI::IsPreferenceOnWhitelist(
const std::string& pref_key) {
return preference_whitelist.Get().IsPreferenceOnWhitelist(pref_key);
}
ChromeDirectSettingAPI* ChromeDirectSettingAPI::Get(
content::BrowserContext* context) {
return BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI>::Get(context);
}
// BrowserContextKeyedAPI implementation.
const char* ChromeDirectSettingAPI::service_name() {
return "ChromeDirectSettingAPI";
}
void ChromeDirectSettingAPI::OnPrefChanged(
PrefService* pref_service, const std::string& pref_key) {
std::string event_name = base::StringPrintf(kOnPrefChangeFormat,
pref_key.c_str());
EventRouter* router = EventRouter::Get(profile_);
if (router && router->HasEventListener(event_name)) {
const PrefService::Preference* preference =
profile_->GetPrefs()->FindPreference(pref_key.c_str());
const base::Value* value = preference->GetValue();
scoped_ptr<base::DictionaryValue> result(new base::DictionaryValue);
result->Set(preference_api_constants::kValue, value->DeepCopy());
base::ListValue args;
args.Append(result.release());
for (const scoped_refptr<const extensions::Extension>& extension :
ExtensionRegistry::Get(profile_)->enabled_extensions()) {
const std::string& extension_id = extension->id();
if (router->ExtensionHasEventListener(extension_id, event_name)) {
scoped_ptr<base::ListValue> args_copy(args.DeepCopy());
// TODO(kalman): Have a histogram value for each pref type.
// This isn't so important for the current use case of these
// histograms, which is to track which event types are waking up event
// pages, or which are delivered to persistent background pages. Simply
// "a setting changed" is enough detail for that. However if we try to
// use these histograms for any fine-grained logic (like removing the
// string event name altogether), or if we discover this event is
// firing a lot and want to understand that better, then this will need
// to change.
events::HistogramValue histogram_value =
events::TYPES_PRIVATE_CHROME_DIRECT_SETTING_ON_CHANGE;
scoped_ptr<Event> event(
new Event(histogram_value, event_name, std::move(args_copy)));
router->DispatchEventToExtension(extension_id, std::move(event));
}
}
}
}
} // namespace chromedirectsetting
} // namespace extensions
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