src/chrome/browser/chromeos/kiosk_mode/kiosk_mode_settings.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/kiosk_mode/kiosk_mode_settings.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/bind.h"
  10 #include "base/command_line.h"
  11 #include "base/lazy_instance.h"
  12 #include "chrome/browser/browser_process.h"
  13 #include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.h"
  14 #include "chrome/browser/chromeos/login/user_manager.h"
  15 #include "chrome/browser/chromeos/settings/cros_settings.h"
  16 #include "chrome/browser/lifetime/application_lifetime.h"
  17 #include "chrome/browser/policy/browser_policy_connector.h"
  18 #include "chrome/browser/policy/cloud/cloud_policy_constants.h"
  19 #include "chromeos/chromeos_switches.h"
  20 #include "chromeos/settings/cros_settings_names.h"
  21 #include "content/public/browser/browser_thread.h"
  22
  23 namespace chromeos {
  24
  25 namespace {
  26 const int kDeviceModeFetchRetryDelayMs = 500;
  27 }
  28
  29 const int KioskModeSettings::kMaxIdleLogoutTimeout = 600000;  // ms
  30 const int KioskModeSettings::kMinIdleLogoutTimeout = 5000;  // ms
  31
  32 const int KioskModeSettings::kMaxIdleLogoutWarningDuration = 60000;  // ms
  33 const int KioskModeSettings::kMinIdleLogoutWarningDuration = 1000;  // ms
  34
  35 static base::LazyInstance<KioskModeSettings> g_kiosk_mode_settings =
  36     LAZY_INSTANCE_INITIALIZER;
  37
  38 // static
  39 KioskModeSettings* KioskModeSettings::Get() {
  40   return g_kiosk_mode_settings.Pointer();
  41 }
  42
  43 bool KioskModeSettings::IsKioskModeEnabled() {
  44   return is_kiosk_mode_;
  45 }
  46
  47 void KioskModeSettings::Initialize(const base::Closure& notify_initialized) {
  48   // No need to call more than once.
  49   if (is_initialized_) {
  50     notify_initialized.Run();
  51     return;
  52   }
  53
  54   CrosSettings* cros_settings = CrosSettings::Get();
  55   if (CrosSettingsProvider::TRUSTED != cros_settings->PrepareTrustedValues(
  56       base::Bind(&KioskModeSettings::Initialize,
  57                  base::Unretained(this),
  58                  notify_initialized))) {
  59     return;
  60   }
  61
  62   // Ignored till we land the code to pull the screensaver path from the app
  63   // packs with the screensaver id.
  64   cros_settings->GetString(kScreenSaverExtensionId, &screensaver_id_);
  65
  66   int screensaver_timeout = 0;
  67   int idle_logout_timeout = 0;
  68   int idle_logout_warning_duration = 0;
  69   cros_settings->GetInteger(kScreenSaverTimeout, &screensaver_timeout);
  70   cros_settings->GetInteger(kIdleLogoutTimeout, &idle_logout_timeout);
  71   cros_settings->GetInteger(kIdleLogoutWarningDuration,
  72                             &idle_logout_warning_duration);
  73
  74   // Restrict idle timeouts to safe values to prevent them from being turned off
  75   // or otherwise misused.
  76   idle_logout_timeout = std::min(idle_logout_timeout,
  77                                  KioskModeSettings::kMaxIdleLogoutTimeout);
  78   idle_logout_timeout = std::max(idle_logout_timeout,
  79                                  KioskModeSettings::kMinIdleLogoutTimeout);
  80
  81   idle_logout_warning_duration =
  82       std::min(idle_logout_warning_duration,
  83                KioskModeSettings::kMaxIdleLogoutWarningDuration);
  84   idle_logout_warning_duration =
  85       std::max(idle_logout_warning_duration,
  86                KioskModeSettings::kMinIdleLogoutWarningDuration);
  87
  88   screensaver_timeout_ = base::TimeDelta::FromMilliseconds(
  89       screensaver_timeout);
  90   idle_logout_timeout_ =
  91       base::TimeDelta::FromMilliseconds(idle_logout_timeout);
  92   idle_logout_warning_duration_ =
  93       base::TimeDelta::FromMilliseconds(idle_logout_warning_duration);
  94
  95   is_initialized_ = true;
  96   notify_initialized.Run();
  97 }
  98
  99 bool KioskModeSettings::is_initialized() const {
 100   return is_initialized_;
 101 }
 102
 103 void KioskModeSettings::GetScreensaverPath(
 104     policy::AppPackUpdater::ScreenSaverUpdateCallback callback) const {
 105   if (!is_initialized_) {
 106     callback.Run(base::FilePath());
 107     return;
 108   }
 109
 110   // Command line flag overrides policy since it can be used
 111   // for testing and dev workflows.
 112   if (CommandLine::ForCurrentProcess()->HasSwitch(
 113           switches::kKioskModeScreensaverPath)) {
 114     callback.Run(base::FilePath(
 115         CommandLine::ForCurrentProcess()->
 116             GetSwitchValueASCII(switches::kKioskModeScreensaverPath)));
 117     return;
 118   }
 119
 120   if (g_browser_process) {
 121     policy::BrowserPolicyConnector* bpc =
 122         g_browser_process->browser_policy_connector();
 123     if (bpc && bpc->GetAppPackUpdater()) {
 124       bpc->GetAppPackUpdater()->SetScreenSaverUpdateCallback(callback);
 125       return;
 126     }
 127   }
 128 }
 129
 130 base::TimeDelta KioskModeSettings::GetScreensaverTimeout() const {
 131   if (!is_initialized_)
 132     return base::TimeDelta::FromSeconds(-1);
 133
 134   return screensaver_timeout_;
 135 }
 136
 137 base::TimeDelta KioskModeSettings::GetIdleLogoutTimeout() const {
 138   if (!is_initialized_)
 139     return base::TimeDelta::FromSeconds(-1);
 140
 141   return idle_logout_timeout_;
 142 }
 143
 144 base::TimeDelta KioskModeSettings::GetIdleLogoutWarningDuration() const {
 145   if (!is_initialized_)
 146     return base::TimeDelta::FromSeconds(-1);
 147
 148   return idle_logout_warning_duration_;
 149 }
 150
 151 KioskModeSettings::KioskModeSettings() : is_initialized_(false) {
 152   // In case we've force-enabled kiosk mode.
 153   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableKioskMode)) {
 154     is_kiosk_mode_ = true;
 155     return;
 156   }
 157
 158   // Precache the value as we know it at construction time to avoid serving
 159   // different values to different users.
 160   if (g_browser_process) {
 161     policy::BrowserPolicyConnector* bpc =
 162         g_browser_process->browser_policy_connector();
 163     policy::DeviceMode device_mode = bpc->GetDeviceMode();
 164     if (device_mode == policy::DEVICE_MODE_RETAIL_KIOSK) {
 165       is_kiosk_mode_ = true;
 166       return;
 167     } else if (device_mode == policy::DEVICE_MODE_PENDING){
 168       DeviceSettingsService::Get()->GetOwnershipStatusAsync(
 169           base::Bind(&KioskModeSettings::VerifyModeIsKnown,
 170                      base::Unretained(this)));
 171     }
 172   }
 173   is_kiosk_mode_ = false;
 174 }
 175
 176 KioskModeSettings::~KioskModeSettings() {
 177 }
 178
 179 void KioskModeSettings::VerifyModeIsKnown(
 180     DeviceSettingsService::OwnershipStatus status) {
 181   if (status != DeviceSettingsService::OWNERSHIP_TAKEN)
 182     return;
 183
 184   if (g_browser_process) {
 185     policy::BrowserPolicyConnector* bpc =
 186         g_browser_process->browser_policy_connector();
 187     policy::DeviceMode device_mode = bpc->GetDeviceMode();
 188     // We retry asking for the mode until it becomes known.
 189     switch (device_mode) {
 190       case policy::DEVICE_MODE_PENDING:
 191         content::BrowserThread::PostDelayedTask(
 192             content::BrowserThread::UI, FROM_HERE,
 193             base::Bind(&KioskModeSettings::VerifyModeIsKnown,
 194                        base::Unretained(this), status),
 195             base::TimeDelta::FromMilliseconds(kDeviceModeFetchRetryDelayMs));
 196         break;
 197       case policy::DEVICE_MODE_RETAIL_KIOSK:
 198         chrome::ExitCleanly();
 199         break;
 200       default:
 201         break;
 202     }
 203   }
 204 }
 205
 206
 207 }  // namespace chromeos