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:
PreferenceWhitelist()26 PreferenceWhitelist() {
27 whitelist_.insert("googlegeolocationaccess.enabled");
28 }
29
~PreferenceWhitelist()30 ~PreferenceWhitelist() {}
31
IsPreferenceOnWhitelist(const std::string & pref_key)32 bool IsPreferenceOnWhitelist(const std::string& pref_key){
33 return whitelist_.find(pref_key) != whitelist_.end();
34 }
35
RegisterEventListeners(Profile * profile,EventRouter::Observer * observer)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
RegisterPropertyListeners(Profile * profile,PrefChangeRegistrar * registrar,const base::Callback<void (const std::string &)> & callback)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
ChromeDirectSettingAPI(content::BrowserContext * context)77 ChromeDirectSettingAPI::ChromeDirectSettingAPI(content::BrowserContext* context)
78 : profile_(Profile::FromBrowserContext(context)) {
79 preference_whitelist.Get().RegisterEventListeners(profile_, this);
80 }
81
~ChromeDirectSettingAPI()82 ChromeDirectSettingAPI::~ChromeDirectSettingAPI() {}
83
84 // KeyedService implementation.
Shutdown()85 void ChromeDirectSettingAPI::Shutdown() {}
86
87 // BrowserContextKeyedAPI implementation.
88 BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI>*
GetFactoryInstance()89 ChromeDirectSettingAPI::GetFactoryInstance() {
90 return g_factory.Pointer();
91 }
92
93 // EventRouter::Observer implementation.
OnListenerAdded(const EventListenerInfo & details)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 ®istrar_,
100 base::Bind(&ChromeDirectSettingAPI::OnPrefChanged,
101 base::Unretained(this),
102 registrar_.prefs()));
103 }
104
IsPreferenceOnWhitelist(const std::string & pref_key)105 bool ChromeDirectSettingAPI::IsPreferenceOnWhitelist(
106 const std::string& pref_key) {
107 return preference_whitelist.Get().IsPreferenceOnWhitelist(pref_key);
108 }
109
Get(content::BrowserContext * context)110 ChromeDirectSettingAPI* ChromeDirectSettingAPI::Get(
111 content::BrowserContext* context) {
112 return BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI>::Get(context);
113 }
114
115 // BrowserContextKeyedAPI implementation.
service_name()116 const char* ChromeDirectSettingAPI::service_name() {
117 return "ChromeDirectSettingAPI";
118 }
119
OnPrefChanged(PrefService * pref_service,const std::string & pref_key)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
154