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
18namespace extensions {
19namespace chromedirectsetting {
20
21const char kOnPrefChangeFormat[] =
22    "types.private.ChromeDirectSetting.%s.onChange";
23
24class 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
70base::LazyInstance<PreferenceWhitelist> preference_whitelist =
71    LAZY_INSTANCE_INITIALIZER;
72
73static base::LazyInstance<
74    BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI> > g_factory =
75    LAZY_INSTANCE_INITIALIZER;
76
77ChromeDirectSettingAPI::ChromeDirectSettingAPI(content::BrowserContext* context)
78    : profile_(Profile::FromBrowserContext(context)) {
79  preference_whitelist.Get().RegisterEventListeners(profile_, this);
80}
81
82ChromeDirectSettingAPI::~ChromeDirectSettingAPI() {}
83
84// KeyedService implementation.
85void ChromeDirectSettingAPI::Shutdown() {}
86
87// BrowserContextKeyedAPI implementation.
88BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI>*
89ChromeDirectSettingAPI::GetFactoryInstance() {
90  return g_factory.Pointer();
91}
92
93// EventRouter::Observer implementation.
94void 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
105bool ChromeDirectSettingAPI::IsPreferenceOnWhitelist(
106    const std::string& pref_key) {
107  return preference_whitelist.Get().IsPreferenceOnWhitelist(pref_key);
108}
109
110ChromeDirectSettingAPI* ChromeDirectSettingAPI::Get(
111    content::BrowserContext* context) {
112  return BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI>::Get(context);
113}
114
115// BrowserContextKeyedAPI implementation.
116const char* ChromeDirectSettingAPI::service_name() {
117  return "ChromeDirectSettingAPI";
118}
119
120void 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