src/chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.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_screensaver.h"
   6
   7 #include "ash/screensaver/screensaver_view.h"
   8 #include "ash/shell.h"
   9 #include "ash/wm/user_activity_detector.h"
  10 #include "base/bind.h"
  11 #include "base/callback.h"
  12 #include "base/lazy_instance.h"
  13 #include "base/logging.h"
  14 #include "chrome/browser/browser_process.h"
  15 #include "chrome/browser/chrome_notification_types.h"
  16 #include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_settings.h"
  17 #include "chrome/browser/chromeos/login/existing_user_controller.h"
  18 #include "chrome/browser/chromeos/login/login_display_host_impl.h"
  19 #include "chrome/browser/chromeos/policy/app_pack_updater.h"
  20 #include "chrome/browser/extensions/extension_service.h"
  21 #include "chrome/browser/extensions/extension_system.h"
  22 #include "chrome/browser/extensions/sandboxed_unpacker.h"
  23 #include "chrome/browser/policy/browser_policy_connector.h"
  24 #include "chrome/browser/ui/webui/chromeos/login/oobe_ui.h"
  25 #include "chrome/common/extensions/extension.h"
  26 #include "chrome/common/extensions/extension_file_util.h"
  27 #include "chrome/common/extensions/manifest_handlers/app_launch_info.h"
  28 #include "chromeos/login/login_state.h"
  29 #include "content/public/browser/browser_thread.h"
  30 #include "content/public/browser/notification_service.h"
  31
  32 using extensions::Extension;
  33 using extensions::SandboxedUnpacker;
  34
  35 namespace chromeos {
  36
  37 namespace {
  38
  39 ExtensionService* GetDefaultExtensionService() {
  40   Profile* default_profile = ProfileManager::GetDefaultProfile();
  41   if (!default_profile)
  42     return NULL;
  43   return extensions::ExtensionSystem::Get(
  44       default_profile)->extension_service();
  45 }
  46
  47 typedef base::Callback<void(
  48     scoped_refptr<Extension>,
  49     const base::FilePath&)> UnpackCallback;
  50
  51 class ScreensaverUnpackerClient
  52     : public extensions::SandboxedUnpackerClient {
  53  public:
  54   ScreensaverUnpackerClient(const base::FilePath& crx_path,
  55                             const UnpackCallback& unpacker_callback)
  56       : crx_path_(crx_path),
  57         unpack_callback_(unpacker_callback) {}
  58
  59   virtual void OnUnpackSuccess(const base::FilePath& temp_dir,
  60                                const base::FilePath& extension_root,
  61                                const base::DictionaryValue* original_manifest,
  62                                const Extension* extension,
  63                                const SkBitmap& install_icon) OVERRIDE;
  64   virtual void OnUnpackFailure(const string16& error) OVERRIDE;
  65
  66  protected:
  67   virtual ~ScreensaverUnpackerClient() {}
  68
  69  private:
  70   void LoadScreensaverExtension(
  71       const base::FilePath& extension_base_path,
  72       const base::FilePath& screensaver_extension_path);
  73
  74   void NotifyAppPackOfDamagedFile();
  75
  76   base::FilePath crx_path_;
  77   UnpackCallback unpack_callback_;
  78
  79   DISALLOW_COPY_AND_ASSIGN(ScreensaverUnpackerClient);
  80 };
  81
  82 void ScreensaverUnpackerClient::OnUnpackSuccess(
  83     const base::FilePath& temp_dir,
  84     const base::FilePath& extension_root,
  85     const base::DictionaryValue* original_manifest,
  86     const Extension* extension,
  87     const SkBitmap& install_icon) {
  88   content::BrowserThread::PostTask(
  89       content::BrowserThread::FILE,
  90       FROM_HERE,
  91       base::Bind(&ScreensaverUnpackerClient::LoadScreensaverExtension,
  92                  this,
  93                  temp_dir,
  94                  extension_root));
  95 }
  96
  97 void ScreensaverUnpackerClient::OnUnpackFailure(const string16& error) {
  98   LOG(ERROR) << "Couldn't unpack screensaver extension. Error: " << error;
  99   NotifyAppPackOfDamagedFile();
 100 }
 101
 102 void ScreensaverUnpackerClient::LoadScreensaverExtension(
 103     const base::FilePath& extension_base_path,
 104     const base::FilePath& screensaver_extension_path) {
 105   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
 106
 107   ExtensionService* service = GetDefaultExtensionService();
 108   // TODO(rkc): This is a HACK, please remove this method from extension
 109   // service once this code is deprecated. See crbug.com/280363
 110   if (service)
 111     service->disable_garbage_collection();
 112
 113   std::string error;
 114   scoped_refptr<Extension> screensaver_extension =
 115       extension_file_util::LoadExtension(screensaver_extension_path,
 116                                          extensions::Manifest::COMPONENT,
 117                                          Extension::NO_FLAGS,
 118                                          &error);
 119   if (!screensaver_extension.get()) {
 120     LOG(ERROR) << "Could not load screensaver extension from: "
 121                << screensaver_extension_path.value() << " due to: " << error;
 122     NotifyAppPackOfDamagedFile();
 123     return;
 124   }
 125
 126   content::BrowserThread::PostTask(
 127       content::BrowserThread::UI,
 128       FROM_HERE,
 129       base::Bind(
 130           unpack_callback_,
 131           screensaver_extension,
 132           extension_base_path));
 133 }
 134
 135 void ScreensaverUnpackerClient::NotifyAppPackOfDamagedFile() {
 136   if (!content::BrowserThread::CurrentlyOn(content::BrowserThread::UI)) {
 137     content::BrowserThread::PostTask(
 138         content::BrowserThread::UI, FROM_HERE,
 139         base::Bind(&ScreensaverUnpackerClient::NotifyAppPackOfDamagedFile,
 140                    this));
 141     return;
 142   }
 143
 144   policy::BrowserPolicyConnector* connector =
 145       g_browser_process->browser_policy_connector();
 146   policy::AppPackUpdater* updater = connector->GetAppPackUpdater();
 147   if (updater)
 148     updater->OnDamagedFileDetected(crx_path_);
 149 }
 150
 151 }  // namespace
 152
 153 KioskModeScreensaver::KioskModeScreensaver()
 154     : weak_ptr_factory_(this) {
 155   chromeos::KioskModeSettings* kiosk_mode_settings =
 156       chromeos::KioskModeSettings::Get();
 157
 158   if (kiosk_mode_settings->is_initialized()) {
 159     GetScreensaverCrxPath();
 160   } else {
 161     kiosk_mode_settings->Initialize(base::Bind(
 162         &KioskModeScreensaver::GetScreensaverCrxPath,
 163         weak_ptr_factory_.GetWeakPtr()));
 164   }
 165 }
 166
 167 KioskModeScreensaver::~KioskModeScreensaver() {
 168   // If we are shutting down the system might already be gone and we shouldn't
 169   // do anything (see crbug.com/288216).
 170   if (!g_browser_process || g_browser_process->IsShuttingDown())
 171     return;
 172
 173   // If the extension was unpacked.
 174   if (!extension_base_path_.empty()) {
 175     ExtensionService* service = GetDefaultExtensionService();
 176     // TODO(rkc): This is a HACK, please remove this method from extension
 177     // service once this code is deprecated. See crbug.com/280363
 178     if (service)
 179       service->enable_garbage_collection();
 180
 181     // Delete it.
 182     content::BrowserThread::PostTask(
 183         content::BrowserThread::FILE,
 184         FROM_HERE,
 185         base::Bind(
 186             &extension_file_util::DeleteFile, extension_base_path_, true));
 187   }
 188
 189   // In case we're shutting down without ever triggering the active
 190   // notification and/or logging in.
 191   if (ash::Shell::GetInstance() &&
 192       ash::Shell::GetInstance()->user_activity_detector() &&
 193       ash::Shell::GetInstance()->user_activity_detector()->HasObserver(this))
 194     ash::Shell::GetInstance()->user_activity_detector()->RemoveObserver(this);
 195 }
 196
 197 void KioskModeScreensaver::GetScreensaverCrxPath() {
 198   chromeos::KioskModeSettings::Get()->GetScreensaverPath(
 199       base::Bind(&KioskModeScreensaver::ScreensaverPathCallback,
 200                  weak_ptr_factory_.GetWeakPtr()));
 201 }
 202
 203 void KioskModeScreensaver::ScreensaverPathCallback(
 204     const base::FilePath& screensaver_crx) {
 205   if (screensaver_crx.empty())
 206     return;
 207
 208   Profile* default_profile = ProfileManager::GetDefaultProfile();
 209   if (!default_profile)
 210     return;
 211   base::FilePath extensions_dir =
 212       GetDefaultExtensionService()->install_directory();
 213   scoped_refptr<SandboxedUnpacker> screensaver_unpacker(
 214       new SandboxedUnpacker(
 215           screensaver_crx,
 216           extensions::Manifest::COMPONENT,
 217           Extension::NO_FLAGS,
 218           extensions_dir,
 219           content::BrowserThread::GetMessageLoopProxyForThread(
 220               content::BrowserThread::FILE).get(),
 221           new ScreensaverUnpackerClient(
 222               screensaver_crx,
 223               base::Bind(
 224                   &KioskModeScreensaver::SetupScreensaver,
 225                   weak_ptr_factory_.GetWeakPtr()))));
 226
 227   // Fire off the unpacker on the file thread; don't need it to return.
 228   content::BrowserThread::PostTask(
 229       content::BrowserThread::FILE,
 230       FROM_HERE,
 231       base::Bind(
 232           &SandboxedUnpacker::Start, screensaver_unpacker.get()));
 233 }
 234
 235 void KioskModeScreensaver::SetupScreensaver(
 236     scoped_refptr<Extension> extension,
 237     const base::FilePath& extension_base_path) {
 238   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 239   extension_base_path_ = extension_base_path;
 240
 241   // If the user is already logged in, don't need to display the screensaver.
 242   if (chromeos::LoginState::Get()->IsUserLoggedIn())
 243     return;
 244
 245   ash::Shell::GetInstance()->user_activity_detector()->AddObserver(this);
 246
 247   Profile* default_profile = ProfileManager::GetDefaultProfile();
 248   // Add the extension to the extension service and display the screensaver.
 249   if (default_profile) {
 250     extensions::ExtensionSystem::Get(default_profile)->extension_service()
 251         ->AddExtension(extension.get());
 252     ash::ShowScreensaver(
 253         extensions::AppLaunchInfo::GetFullLaunchURL(extension.get()));
 254   } else {
 255     LOG(ERROR) << "Couldn't get default profile. Unable to load screensaver!";
 256     ShutdownKioskModeScreensaver();
 257   }
 258 }
 259
 260 void KioskModeScreensaver::OnUserActivity(const ui::Event* event) {
 261   // We don't want to handle further user notifications; we'll either login
 262   // the user and close out or or at least close the screensaver.
 263   ash::Shell::GetInstance()->user_activity_detector()->RemoveObserver(this);
 264
 265   // Find the retail mode login page.
 266   if (LoginDisplayHostImpl::default_host()) {
 267     LoginDisplayHostImpl* webui_host =
 268         static_cast<LoginDisplayHostImpl*>(
 269             LoginDisplayHostImpl::default_host());
 270     OobeUI* oobe_ui = webui_host->GetOobeUI();
 271
 272     // Show the login spinner.
 273     if (oobe_ui)
 274       oobe_ui->ShowRetailModeLoginSpinner();
 275
 276     // Close the screensaver, our login spinner is already showing.
 277     ash::CloseScreensaver();
 278
 279     // Log us in.
 280     ExistingUserController* controller =
 281         ExistingUserController::current_controller();
 282     if (controller && !chromeos::LoginState::Get()->IsUserLoggedIn())
 283       controller->LoginAsRetailModeUser();
 284   } else {
 285     // No default host for the WebUiLoginDisplay means that we're already in the
 286     // process of logging in - shut down screensaver and do nothing else.
 287     ash::CloseScreensaver();
 288   }
 289
 290   ShutdownKioskModeScreensaver();
 291 }
 292
 293 static KioskModeScreensaver* g_kiosk_mode_screensaver = NULL;
 294
 295 void InitializeKioskModeScreensaver() {
 296   if (g_kiosk_mode_screensaver) {
 297     LOG(WARNING) << "Screensaver was already initialized";
 298     return;
 299   }
 300
 301   g_kiosk_mode_screensaver = new KioskModeScreensaver();
 302 }
 303
 304 void ShutdownKioskModeScreensaver() {
 305   delete g_kiosk_mode_screensaver;
 306   g_kiosk_mode_screensaver = NULL;
 307 }
 308
 309 }  // namespace chromeos