chrome/browser/chromeos/settings/system_settings_provider.cc

   1 // Copyright (c) 2012 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/chromeos/settings/system_settings_provider.h"
   6
   7 #include "base/strings/string16.h"
   8 #include "base/time/time.h"
   9 #include "base/values.h"
  10 #include "chromeos/login/login_state.h"
  11 #include "chromeos/settings/cros_settings_names.h"
  12 #include "content/public/browser/render_process_host.h"
  13
  14 namespace chromeos {
  15
  16 SystemSettingsProvider::SystemSettingsProvider(
  17     const NotifyObserversCallback& notify_cb)
  18     : CrosSettingsProvider(notify_cb) {
  19   system::TimezoneSettings *timezone_settings =
  20       system::TimezoneSettings::GetInstance();
  21   timezone_settings->AddObserver(this);
  22   timezone_value_.reset(new base::StringValue(
  23       timezone_settings->GetCurrentTimezoneID()));
  24 }
  25
  26 SystemSettingsProvider::~SystemSettingsProvider() {
  27   system::TimezoneSettings::GetInstance()->RemoveObserver(this);
  28 }
  29
  30 void SystemSettingsProvider::DoSet(const std::string& path,
  31                                    const base::Value& in_value) {
  32   // Only non-guest users can change the time zone.
  33   if (LoginState::Get()->IsGuestSessionUser() ||
  34       LoginState::Get()->IsPublicSessionUser()) {
  35     return;
  36   }
  37
  38   if (path == kSystemTimezone) {
  39     base::string16 timezone_id;
  40     if (!in_value.GetAsString(&timezone_id))
  41       return;
  42     // This will call TimezoneChanged.
  43     system::TimezoneSettings::GetInstance()->SetTimezoneFromID(timezone_id);
  44   }
  45 }
  46
  47 const base::Value* SystemSettingsProvider::Get(const std::string& path) const {
  48   if (path == kSystemTimezone)
  49     return timezone_value_.get();
  50   return NULL;
  51 }
  52
  53 // The timezone is always trusted.
  54 CrosSettingsProvider::TrustedStatus
  55     SystemSettingsProvider::PrepareTrustedValues(const base::Closure& cb) {
  56   return TRUSTED;
  57 }
  58
  59 bool SystemSettingsProvider::HandlesSetting(const std::string& path) const {
  60   return path == kSystemTimezone;
  61 }
  62
  63 void SystemSettingsProvider::TimezoneChanged(const icu::TimeZone& timezone) {
  64   // Fires system setting change notification.
  65   timezone_value_.reset(new base::StringValue(
  66       system::TimezoneSettings::GetTimezoneID(timezone)));
  67   NotifyObservers(kSystemTimezone);
  68 }
  69
  70 }  // namespace chromeos