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      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   // Non-guest users can change the time zone.
     33   if (LoginState::Get()->IsGuestUser())
     34     return;
     35 
     36   if (path == kSystemTimezone) {
     37     base::string16 timezone_id;
     38     if (!in_value.GetAsString(&timezone_id))
     39       return;
     40     // This will call TimezoneChanged.
     41     system::TimezoneSettings::GetInstance()->SetTimezoneFromID(timezone_id);
     42   }
     43 }
     44 
     45 const base::Value* SystemSettingsProvider::Get(const std::string& path) const {
     46   if (path == kSystemTimezone)
     47     return timezone_value_.get();
     48   return NULL;
     49 }
     50 
     51 // The timezone is always trusted.
     52 CrosSettingsProvider::TrustedStatus
     53     SystemSettingsProvider::PrepareTrustedValues(const base::Closure& cb) {
     54   return TRUSTED;
     55 }
     56 
     57 bool SystemSettingsProvider::HandlesSetting(const std::string& path) const {
     58   return path == kSystemTimezone;
     59 }
     60 
     61 void SystemSettingsProvider::TimezoneChanged(const icu::TimeZone& timezone) {
     62   // Fires system setting change notification.
     63   timezone_value_.reset(new base::StringValue(
     64       system::TimezoneSettings::GetTimezoneID(timezone)));
     65   NotifyObservers(kSystemTimezone);
     66 }
     67 
     68 }  // namespace chromeos
     69