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   }
  29
  30   ~PreferenceWhitelist() {}
  31
  32   bool IsPreferenceOnWhitelist(const std::string& pref_key){
  33     return whitelist_.find(pref_key) != whitelist_.end();
  34   }
  35
  36   void RegisterEventListeners(
  37       Profile* profile,
  38       EventRouter::Observer* observer) {
  39     for (base::hash_set<std::string>::iterator iter = whitelist_.begin();
  40          iter != whitelist_.end();
  41          iter++) {
  42       std::string event_name = base::StringPrintf(
  43           kOnPrefChangeFormat,
  44           (*iter).c_str());
  45       EventRouter::Get(profile)->RegisterObserver(observer, event_name);
  46     }
  47   }
  48
  49   void RegisterPropertyListeners(
  50       Profile* profile,
  51       PrefChangeRegistrar* registrar,
  52       const base::Callback<void(const std::string&)>& callback) {
  53     for (base::hash_set<std::string>::iterator iter = whitelist_.begin();
  54          iter != whitelist_.end();
  55          iter++) {
  56       const char* pref_key = (*iter).c_str();
  57       std::string event_name = base::StringPrintf(
  58           kOnPrefChangeFormat,
  59           pref_key);
  60       registrar->Add(pref_key, callback);
  61     }
  62   }
  63
  64  private:
  65   base::hash_set<std::string> whitelist_;
  66
  67   DISALLOW_COPY_AND_ASSIGN(PreferenceWhitelist);
  68 };
  69
  70 base::LazyInstance<PreferenceWhitelist> preference_whitelist =
  71     LAZY_INSTANCE_INITIALIZER;
  72
  73 static base::LazyInstance<
  74     BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI> > g_factory =
  75     LAZY_INSTANCE_INITIALIZER;
  76
  77 ChromeDirectSettingAPI::ChromeDirectSettingAPI(content::BrowserContext* context)
  78     : profile_(Profile::FromBrowserContext(context)) {
  79   preference_whitelist.Get().RegisterEventListeners(profile_, this);
  80 }
  81
  82 ChromeDirectSettingAPI::~ChromeDirectSettingAPI() {}
  83
  84 // KeyedService implementation.
  85 void ChromeDirectSettingAPI::Shutdown() {}
  86
  87 // BrowserContextKeyedAPI implementation.
  88 BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI>*
  89 ChromeDirectSettingAPI::GetFactoryInstance() {
  90   return g_factory.Pointer();
  91 }
  92
  93 // EventRouter::Observer implementation.
  94 void ChromeDirectSettingAPI::OnListenerAdded(const EventListenerInfo& details) {
  95   EventRouter::Get(profile_)->UnregisterObserver(this);
  96   registrar_.Init(profile_->GetPrefs());
  97   preference_whitelist.Get().RegisterPropertyListeners(
  98       profile_,
  99       &registrar_,
 100       base::Bind(&ChromeDirectSettingAPI::OnPrefChanged,
 101                  base::Unretained(this),
 102                  registrar_.prefs()));
 103 }
 104
 105 bool ChromeDirectSettingAPI::IsPreferenceOnWhitelist(
 106     const std::string& pref_key) {
 107   return preference_whitelist.Get().IsPreferenceOnWhitelist(pref_key);
 108 }
 109
 110 ChromeDirectSettingAPI* ChromeDirectSettingAPI::Get(
 111     content::BrowserContext* context) {
 112   return BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI>::Get(context);
 113 }
 114
 115 // BrowserContextKeyedAPI implementation.
 116 const char* ChromeDirectSettingAPI::service_name() {
 117   return "ChromeDirectSettingAPI";
 118 }
 119
 120 void ChromeDirectSettingAPI::OnPrefChanged(
 121     PrefService* pref_service, const std::string& pref_key) {
 122   std::string event_name = base::StringPrintf(kOnPrefChangeFormat,
 123                                               pref_key.c_str());
 124   EventRouter* router = EventRouter::Get(profile_);
 125   if (router && router->HasEventListener(event_name)) {
 126     const PrefService::Preference* preference =
 127         profile_->GetPrefs()->FindPreference(pref_key.c_str());
 128     const base::Value* value = preference->GetValue();
 129
 130     scoped_ptr<base::DictionaryValue> result(new base::DictionaryValue);
 131     result->Set(preference_api_constants::kValue, value->DeepCopy());
 132     base::ListValue args;
 133     args.Append(result.release());
 134
 135     ExtensionService* extension_service =
 136         ExtensionSystem::Get(profile_)->extension_service();
 137     const ExtensionSet* extensions = extension_service->extensions();
 138     for (ExtensionSet::const_iterator it = extensions->begin();
 139          it != extensions->end(); ++it) {
 140       if ((*it)->location() == Manifest::COMPONENT) {
 141         std::string extension_id = (*it)->id();
 142         if (router->ExtensionHasEventListener(extension_id, event_name)) {
 143           scoped_ptr<base::ListValue> args_copy(args.DeepCopy());
 144           scoped_ptr<Event> event(new Event(event_name, args_copy.Pass()));
 145           router->DispatchEventToExtension(extension_id, event.Pass());
 146         }
 147       }
 148     }
 149   }
 150 }
 151
 152 }  // namespace chromedirectsetting
 153 }  // namespace extensions