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