src/chrome/browser/extensions/api/preference/chrome_direct_setting_api.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/extensions/api/preference/chrome_direct_setting_api.h"
   6
   7 #include "base/bind.h"
   8 #include "base/containers/hash_tables.h"
   9 #include "base/lazy_instance.h"
  10 #include "base/prefs/pref_change_registrar.h"
  11 #include "base/prefs/pref_service.h"
  12 #include "base/strings/stringprintf.h"
  13 #include "chrome/browser/extensions/api/preference/preference_api_constants.h"
  14 #include "chrome/browser/extensions/extension_service.h"
  15 #include "chrome/browser/profiles/profile.h"
  16 #include "extensions/browser/extension_system.h"
  17
  18 namespace extensions {
  19 namespace chromedirectsetting {
  20
  21 const char kOnPrefChangeFormat[] =
  22     "types.private.ChromeDirectSetting.%s.onChange";
  23
  24 class PreferenceWhitelist {
  25  public:
  26   PreferenceWhitelist() {
  27     whitelist_.insert("googlegeolocationaccess.enabled");
  28     whitelist_.insert("spdy_proxy.enabled");
  29     whitelist_.insert("data_reduction.daily_original_length");
  30     whitelist_.insert("data_reduction.daily_received_length");
  31     whitelist_.insert("data_reduction.update_daily_lengths");
  32     whitelist_.insert("easy_unlock.proximity_required");
  33   }
  34
  35   ~PreferenceWhitelist() {}
  36
  37   bool IsPreferenceOnWhitelist(const std::string& pref_key){
  38     return whitelist_.find(pref_key) != whitelist_.end();
  39   }
  40
  41   void RegisterEventListeners(
  42       Profile* profile,
  43       EventRouter::Observer* observer) {
  44     for (base::hash_set<std::string>::iterator iter = whitelist_.begin();
  45          iter != whitelist_.end();
  46          iter++) {
  47       std::string event_name = base::StringPrintf(
  48           kOnPrefChangeFormat,
  49           (*iter).c_str());
  50       EventRouter::Get(profile)->RegisterObserver(observer, event_name);
  51     }
  52   }
  53
  54   void RegisterPropertyListeners(
  55       Profile* profile,
  56       PrefChangeRegistrar* registrar,
  57       const base::Callback<void(const std::string&)>& callback) {
  58     for (base::hash_set<std::string>::iterator iter = whitelist_.begin();
  59          iter != whitelist_.end();
  60          iter++) {
  61       const char* pref_key = (*iter).c_str();
  62       std::string event_name = base::StringPrintf(
  63           kOnPrefChangeFormat,
  64           pref_key);
  65       registrar->Add(pref_key, callback);
  66     }
  67   }
  68
  69  private:
  70   base::hash_set<std::string> whitelist_;
  71
  72   DISALLOW_COPY_AND_ASSIGN(PreferenceWhitelist);
  73 };
  74
  75 base::LazyInstance<PreferenceWhitelist> preference_whitelist =
  76     LAZY_INSTANCE_INITIALIZER;
  77
  78 static base::LazyInstance<
  79     BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI> > g_factory =
  80     LAZY_INSTANCE_INITIALIZER;
  81
  82 ChromeDirectSettingAPI::ChromeDirectSettingAPI(content::BrowserContext* context)
  83     : profile_(Profile::FromBrowserContext(context)) {
  84   preference_whitelist.Get().RegisterEventListeners(profile_, this);
  85 }
  86
  87 ChromeDirectSettingAPI::~ChromeDirectSettingAPI() {}
  88
  89 // KeyedService implementation.
  90 void ChromeDirectSettingAPI::Shutdown() {}
  91
  92 // BrowserContextKeyedAPI implementation.
  93 BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI>*
  94 ChromeDirectSettingAPI::GetFactoryInstance() {
  95   return g_factory.Pointer();
  96 }
  97
  98 // EventRouter::Observer implementation.
  99 void ChromeDirectSettingAPI::OnListenerAdded(const EventListenerInfo& details) {
 100   EventRouter::Get(profile_)->UnregisterObserver(this);
 101   registrar_.Init(profile_->GetPrefs());
 102   preference_whitelist.Get().RegisterPropertyListeners(
 103       profile_,
 104       &registrar_,
 105       base::Bind(&ChromeDirectSettingAPI::OnPrefChanged,
 106                  base::Unretained(this),
 107                  registrar_.prefs()));
 108 }
 109
 110 bool ChromeDirectSettingAPI::IsPreferenceOnWhitelist(
 111     const std::string& pref_key) {
 112   return preference_whitelist.Get().IsPreferenceOnWhitelist(pref_key);
 113 }
 114
 115 ChromeDirectSettingAPI* ChromeDirectSettingAPI::Get(
 116     content::BrowserContext* context) {
 117   return BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI>::Get(context);
 118 }
 119
 120 // BrowserContextKeyedAPI implementation.
 121 const char* ChromeDirectSettingAPI::service_name() {
 122   return "ChromeDirectSettingAPI";
 123 }
 124
 125 void ChromeDirectSettingAPI::OnPrefChanged(
 126     PrefService* pref_service, const std::string& pref_key) {
 127   std::string event_name = base::StringPrintf(kOnPrefChangeFormat,
 128                                               pref_key.c_str());
 129   EventRouter* router = EventRouter::Get(profile_);
 130   if (router && router->HasEventListener(event_name)) {
 131     const PrefService::Preference* preference =
 132         profile_->GetPrefs()->FindPreference(pref_key.c_str());
 133     const base::Value* value = preference->GetValue();
 134
 135     scoped_ptr<base::DictionaryValue> result(new base::DictionaryValue);
 136     result->Set(preference_api_constants::kValue, value->DeepCopy());
 137     base::ListValue args;
 138     args.Append(result.release());
 139
 140     ExtensionService* extension_service =
 141         ExtensionSystem::Get(profile_)->extension_service();
 142     const ExtensionSet* extensions = extension_service->extensions();
 143     for (ExtensionSet::const_iterator it = extensions->begin();
 144          it != extensions->end(); ++it) {
 145       const std::string& extension_id = (*it)->id();
 146       if (router->ExtensionHasEventListener(extension_id, event_name)) {
 147         scoped_ptr<base::ListValue> args_copy(args.DeepCopy());
 148         scoped_ptr<Event> event(new Event(event_name, args_copy.Pass()));
 149         router->DispatchEventToExtension(extension_id, event.Pass());
 150       }
 151     }
 152   }
 153 }
 154
 155 }  // namespace chromedirectsetting
 156 }  // namespace extensions