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
  17 namespace extensions {
  18 namespace chromedirectsetting {
  19
  20 const char kOnPrefChangeFormat[] =
  21     "types.private.ChromeDirectSetting.%s.onChange";
  22
  23 class PreferenceWhitelist {
  24  public:
  25   PreferenceWhitelist() {
  26     whitelist_.insert("googlegeolocationaccess.enabled");
  27   }
  28
  29   ~PreferenceWhitelist() {}
  30
  31   bool IsPreferenceOnWhitelist(const std::string& pref_key){
  32     return whitelist_.find(pref_key) != whitelist_.end();
  33   }
  34
  35   void RegisterEventListeners(
  36       Profile* profile,
  37       EventRouter::Observer* observer) {
  38     for (base::hash_set<std::string>::iterator iter = whitelist_.begin();
  39          iter != whitelist_.end();
  40          iter++) {
  41       std::string event_name = base::StringPrintf(
  42           kOnPrefChangeFormat,
  43           (*iter).c_str());
  44       ExtensionSystem::Get(profile)->event_router()->RegisterObserver(
  45           observer,
  46           event_name);
  47     }
  48   }
  49
  50   void RegisterPropertyListeners(
  51       Profile* profile,
  52       PrefChangeRegistrar* registrar,
  53       const base::Callback<void(const std::string&)>& callback) {
  54     for (base::hash_set<std::string>::iterator iter = whitelist_.begin();
  55          iter != whitelist_.end();
  56          iter++) {
  57       const char* pref_key = (*iter).c_str();
  58       std::string event_name = base::StringPrintf(
  59           kOnPrefChangeFormat,
  60           pref_key);
  61       registrar->Add(pref_key, callback);
  62     }
  63   }
  64
  65  private:
  66   base::hash_set<std::string> whitelist_;
  67
  68   DISALLOW_COPY_AND_ASSIGN(PreferenceWhitelist);
  69 };
  70
  71 base::LazyInstance<PreferenceWhitelist> preference_whitelist =
  72     LAZY_INSTANCE_INITIALIZER;
  73
  74 static base::LazyInstance<ProfileKeyedAPIFactory<ChromeDirectSettingAPI> >
  75     g_factory = LAZY_INSTANCE_INITIALIZER;
  76
  77 ChromeDirectSettingAPI::ChromeDirectSettingAPI(Profile* profile)
  78     : profile_(profile) {
  79   preference_whitelist.Get().RegisterEventListeners(profile, this);
  80 }
  81
  82 ChromeDirectSettingAPI::~ChromeDirectSettingAPI() {}
  83
  84 // BrowserContextKeyedService implementation.
  85 void ChromeDirectSettingAPI::Shutdown() {}
  86
  87 // ProfileKeyedAPI implementation.
  88 ProfileKeyedAPIFactory<ChromeDirectSettingAPI>*
  89     ChromeDirectSettingAPI::GetFactoryInstance() {
  90   return &g_factory.Get();
  91 }
  92
  93 // EventRouter::Observer implementation.
  94 void ChromeDirectSettingAPI::OnListenerAdded(const EventListenerInfo& details) {
  95   ExtensionSystem::Get(profile_)->event_router()->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(Profile* profile) {
 111   return
 112       ProfileKeyedAPIFactory<ChromeDirectSettingAPI>::GetForProfile(profile);
 113 }
 114
 115 // ProfileKeyedAPI 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 = ExtensionSystem::Get(profile_)->event_router();
 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<DictionaryValue> result(new 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
 154