chrome/browser/extensions/extension_service.cc

   1 // Copyright (c) 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/extension_service.h"
   6
   7 #include <algorithm>
   8 #include <iterator>
   9 #include <set>
  10
  11 #include "base/command_line.h"
  12 #include "base/location.h"
  13 #include "base/metrics/histogram_macros.h"
  14 #include "base/profiler/scoped_profile.h"
  15 #include "base/single_thread_task_runner.h"
  16 #include "base/strings/string_number_conversions.h"
  17 #include "base/strings/stringprintf.h"
  18 #include "base/strings/utf_string_conversions.h"
  19 #include "base/thread_task_runner_handle.h"
  20 #include "base/threading/sequenced_worker_pool.h"
  21 #include "base/threading/thread_restrictions.h"
  22 #include "base/time/time.h"
  23 #include "base/trace_event/trace_event.h"
  24 #include "chrome/browser/browser_process.h"
  25 #include "chrome/browser/chrome_notification_types.h"
  26 #include "chrome/browser/content_settings/content_settings_internal_extension_provider.h"
  27 #include "chrome/browser/extensions/api/content_settings/content_settings_custom_extension_provider.h"
  28 #include "chrome/browser/extensions/api/content_settings/content_settings_service.h"
  29 #include "chrome/browser/extensions/app_data_migrator.h"
  30 #include "chrome/browser/extensions/component_loader.h"
  31 #include "chrome/browser/extensions/crx_installer.h"
  32 #include "chrome/browser/extensions/data_deleter.h"
  33 #include "chrome/browser/extensions/extension_action_storage_manager.h"
  34 #include "chrome/browser/extensions/extension_assets_manager.h"
  35 #include "chrome/browser/extensions/extension_disabled_ui.h"
  36 #include "chrome/browser/extensions/extension_error_controller.h"
  37 #include "chrome/browser/extensions/extension_special_storage_policy.h"
  38 #include "chrome/browser/extensions/extension_sync_service.h"
  39 #include "chrome/browser/extensions/extension_util.h"
  40 #include "chrome/browser/extensions/external_install_manager.h"
  41 #include "chrome/browser/extensions/external_provider_impl.h"
  42 #include "chrome/browser/extensions/install_verifier.h"
  43 #include "chrome/browser/extensions/installed_loader.h"
  44 #include "chrome/browser/extensions/pending_extension_manager.h"
  45 #include "chrome/browser/extensions/permissions_updater.h"
  46 #include "chrome/browser/extensions/shared_module_service.h"
  47 #include "chrome/browser/extensions/unpacked_installer.h"
  48 #include "chrome/browser/extensions/updater/chrome_extension_downloader_factory.h"
  49 #include "chrome/browser/extensions/updater/extension_updater.h"
  50 #include "chrome/browser/google/google_brand.h"
  51 #include "chrome/browser/profiles/profile.h"
  52 #include "chrome/browser/search/thumbnail_source.h"
  53 #include "chrome/browser/ui/webui/extensions/extension_icon_source.h"
  54 #include "chrome/browser/ui/webui/favicon_source.h"
  55 #include "chrome/browser/ui/webui/theme_source.h"
  56 #include "chrome/common/chrome_switches.h"
  57 #include "chrome/common/crash_keys.h"
  58 #include "chrome/common/extensions/extension_constants.h"
  59 #include "chrome/common/extensions/features/feature_channel.h"
  60 #include "chrome/common/url_constants.h"
  61 #include "components/content_settings/core/browser/host_content_settings_map.h"
  62 #include "components/crx_file/id_util.h"
  63 #include "components/startup_metric_utils/startup_metric_utils.h"
  64 #include "content/public/browser/devtools_agent_host.h"
  65 #include "content/public/browser/notification_service.h"
  66 #include "content/public/browser/render_process_host.h"
  67 #include "content/public/browser/storage_partition.h"
  68 #include "extensions/browser/app_sorting.h"
  69 #include "extensions/browser/event_router.h"
  70 #include "extensions/browser/extension_host.h"
  71 #include "extensions/browser/extension_prefs.h"
  72 #include "extensions/browser/extension_registry.h"
  73 #include "extensions/browser/extension_system.h"
  74 #include "extensions/browser/extensions_browser_client.h"
  75 #include "extensions/browser/install_flag.h"
  76 #include "extensions/browser/runtime_data.h"
  77 #include "extensions/browser/uninstall_reason.h"
  78 #include "extensions/browser/update_observer.h"
  79 #include "extensions/browser/updater/extension_cache.h"
  80 #include "extensions/browser/updater/extension_downloader.h"
  81 #include "extensions/common/extension_messages.h"
  82 #include "extensions/common/extension_urls.h"
  83 #include "extensions/common/feature_switch.h"
  84 #include "extensions/common/file_util.h"
  85 #include "extensions/common/manifest_constants.h"
  86 #include "extensions/common/manifest_handlers/background_info.h"
  87 #include "extensions/common/manifest_url_handlers.h"
  88 #include "extensions/common/one_shot_event.h"
  89 #include "extensions/common/permissions/api_permission.h"
  90 #include "extensions/common/permissions/permission_message_provider.h"
  91 #include "extensions/common/permissions/permissions_data.h"
  92
  93 #if defined(ENABLE_SUPERVISED_USERS)
  94 #include "chrome/browser/supervised_user/supervised_user_service.h"
  95 #include "chrome/browser/supervised_user/supervised_user_service_factory.h"
  96 #endif
  97
  98 #if defined(OS_CHROMEOS)
  99 #include "chrome/browser/chromeos/extensions/install_limiter.h"
 100 #include "storage/browser/fileapi/file_system_backend.h"
 101 #include "storage/browser/fileapi/file_system_context.h"
 102 #endif
 103
 104 using content::BrowserContext;
 105 using content::BrowserThread;
 106 using content::DevToolsAgentHost;
 107 using extensions::APIPermission;
 108 using extensions::CrxInstaller;
 109 using extensions::Extension;
 110 using extensions::ExtensionIdSet;
 111 using extensions::ExtensionInfo;
 112 using extensions::ExtensionRegistry;
 113 using extensions::ExtensionSet;
 114 using extensions::FeatureSwitch;
 115 using extensions::InstallVerifier;
 116 using extensions::ManagementPolicy;
 117 using extensions::Manifest;
 118 using extensions::PermissionID;
 119 using extensions::PermissionIDSet;
 120 using extensions::PermissionSet;
 121 using extensions::SharedModuleInfo;
 122 using extensions::SharedModuleService;
 123 using extensions::UnloadedExtensionInfo;
 124
 125 namespace {
 126
 127 // Wait this many seconds after an extensions becomes idle before updating it.
 128 const int kUpdateIdleDelay = 5;
 129
 130 #if defined(ENABLE_SUPERVISED_USERS)
 131 // Callback for SupervisedUserService::AddExtensionUpdateRequest.
 132 void ExtensionUpdateRequestSent(const std::string& id, bool success) {
 133   LOG_IF(WARNING, !success) << "Failed sending update request for " << id;
 134 }
 135 #endif
 136
 137 }  // namespace
 138
 139 // ExtensionService.
 140
 141 void ExtensionService::CheckExternalUninstall(const std::string& id) {
 142   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 143
 144   // Check if the providers know about this extension.
 145   extensions::ProviderCollection::const_iterator i;
 146   for (i = external_extension_providers_.begin();
 147        i != external_extension_providers_.end(); ++i) {
 148     DCHECK(i->get()->IsReady());
 149     if (i->get()->HasExtension(id))
 150       return;  // Yup, known extension, don't uninstall.
 151   }
 152
 153   // We get the list of external extensions to check from preferences.
 154   // It is possible that an extension has preferences but is not loaded.
 155   // For example, an extension that requires experimental permissions
 156   // will not be loaded if the experimental command line flag is not used.
 157   // In this case, do not uninstall.
 158   if (!GetInstalledExtension(id)) {
 159     // We can't call UninstallExtension with an unloaded/invalid
 160     // extension ID.
 161     LOG(WARNING) << "Attempted uninstallation of unloaded/invalid extension "
 162                  << "with id: " << id;
 163     return;
 164   }
 165   UninstallExtension(id,
 166                      extensions::UNINSTALL_REASON_ORPHANED_EXTERNAL_EXTENSION,
 167                      base::Bind(&base::DoNothing),
 168                      NULL);
 169 }
 170
 171 void ExtensionService::SetFileTaskRunnerForTesting(
 172     const scoped_refptr<base::SequencedTaskRunner>& task_runner) {
 173   file_task_runner_ = task_runner;
 174 }
 175
 176 void ExtensionService::ClearProvidersForTesting() {
 177   external_extension_providers_.clear();
 178 }
 179
 180 void ExtensionService::AddProviderForTesting(
 181     extensions::ExternalProviderInterface* test_provider) {
 182   CHECK(test_provider);
 183   external_extension_providers_.push_back(
 184       linked_ptr<extensions::ExternalProviderInterface>(test_provider));
 185 }
 186
 187 void ExtensionService::BlacklistExtensionForTest(
 188     const std::string& extension_id) {
 189   ExtensionIdSet blacklisted;
 190   ExtensionIdSet unchanged;
 191   blacklisted.insert(extension_id);
 192   UpdateBlacklistedExtensions(blacklisted, unchanged);
 193 }
 194
 195 bool ExtensionService::OnExternalExtensionUpdateUrlFound(
 196     const std::string& id,
 197     const std::string& install_parameter,
 198     const GURL& update_url,
 199     Manifest::Location location,
 200     int creation_flags,
 201     bool mark_acknowledged) {
 202   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 203   CHECK(crx_file::id_util::IdIsValid(id));
 204
 205   if (Manifest::IsExternalLocation(location)) {
 206     // All extensions that are not user specific can be cached.
 207     extensions::ExtensionsBrowserClient::Get()->GetExtensionCache()
 208         ->AllowCaching(id);
 209   }
 210
 211   const Extension* extension = GetExtensionById(id, true);
 212   if (extension) {
 213     // Already installed. Skip this install if the current location has
 214     // higher priority than |location|.
 215     Manifest::Location current = extension->location();
 216     if (current == Manifest::GetHigherPriorityLocation(current, location))
 217       return false;
 218     // Otherwise, overwrite the current installation.
 219   }
 220
 221   // Add |id| to the set of pending extensions.  If it can not be added,
 222   // then there is already a pending record from a higher-priority install
 223   // source.  In this case, signal that this extension will not be
 224   // installed by returning false.
 225   if (!pending_extension_manager()->AddFromExternalUpdateUrl(
 226           id,
 227           install_parameter,
 228           update_url,
 229           location,
 230           creation_flags,
 231           mark_acknowledged)) {
 232     return false;
 233   }
 234
 235   update_once_all_providers_are_ready_ = true;
 236   return true;
 237 }
 238
 239 // static
 240 // This function is used to uninstall an extension via sync.  The LOG statements
 241 // within this function are used to inform the user if the uninstall cannot be
 242 // done.
 243 bool ExtensionService::UninstallExtensionHelper(
 244     ExtensionService* extensions_service,
 245     const std::string& extension_id,
 246     extensions::UninstallReason reason) {
 247   // We can't call UninstallExtension with an invalid extension ID.
 248   if (!extensions_service->GetInstalledExtension(extension_id)) {
 249     LOG(WARNING) << "Attempted uninstallation of non-existent extension with "
 250                  << "id: " << extension_id;
 251     return false;
 252   }
 253
 254   // The following call to UninstallExtension will not allow an uninstall of a
 255   // policy-controlled extension.
 256   base::string16 error;
 257   if (!extensions_service->UninstallExtension(
 258           extension_id, reason, base::Bind(&base::DoNothing), &error)) {
 259     LOG(WARNING) << "Cannot uninstall extension with id " << extension_id
 260                  << ": " << error;
 261     return false;
 262   }
 263
 264   return true;
 265 }
 266
 267 ExtensionService::ExtensionService(Profile* profile,
 268                                    const base::CommandLine* command_line,
 269                                    const base::FilePath& install_directory,
 270                                    extensions::ExtensionPrefs* extension_prefs,
 271                                    extensions::Blacklist* blacklist,
 272                                    bool autoupdate_enabled,
 273                                    bool extensions_enabled,
 274                                    extensions::OneShotEvent* ready)
 275     : extensions::Blacklist::Observer(blacklist),
 276       profile_(profile),
 277       system_(extensions::ExtensionSystem::Get(profile)),
 278       extension_prefs_(extension_prefs),
 279       blacklist_(blacklist),
 280       registry_(extensions::ExtensionRegistry::Get(profile)),
 281       pending_extension_manager_(profile),
 282       install_directory_(install_directory),
 283       extensions_enabled_(extensions_enabled),
 284       show_extensions_prompts_(true),
 285       install_updates_when_idle_(true),
 286       ready_(ready),
 287       update_once_all_providers_are_ready_(false),
 288       browser_terminating_(false),
 289       installs_delayed_for_gc_(false),
 290       is_first_run_(false),
 291       block_extensions_(false),
 292       shared_module_service_(new extensions::SharedModuleService(profile_)),
 293       app_data_migrator_(new extensions::AppDataMigrator(profile_, registry_)) {
 294   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 295   TRACE_EVENT0("browser,startup", "ExtensionService::ExtensionService::ctor");
 296
 297   // Figure out if extension installation should be enabled.
 298   if (extensions::ExtensionsBrowserClient::Get()->AreExtensionsDisabled(
 299           *command_line, profile))
 300     extensions_enabled_ = false;
 301
 302   registrar_.Add(this, chrome::NOTIFICATION_APP_TERMINATING,
 303                  content::NotificationService::AllBrowserContextsAndSources());
 304   registrar_.Add(this,
 305                  extensions::NOTIFICATION_EXTENSION_PROCESS_TERMINATED,
 306                  content::NotificationService::AllBrowserContextsAndSources());
 307   registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_TERMINATED,
 308                  content::NotificationService::AllBrowserContextsAndSources());
 309   registrar_.Add(this, chrome::NOTIFICATION_UPGRADE_RECOMMENDED,
 310                  content::NotificationService::AllBrowserContextsAndSources());
 311   registrar_.Add(this,
 312                  chrome::NOTIFICATION_PROFILE_DESTRUCTION_STARTED,
 313                  content::Source<Profile>(profile_));
 314
 315   extensions::ExtensionManagementFactory::GetForBrowserContext(profile_)
 316       ->AddObserver(this);
 317
 318   // Set up the ExtensionUpdater.
 319   if (autoupdate_enabled) {
 320     int update_frequency = extensions::kDefaultUpdateFrequencySeconds;
 321     if (command_line->HasSwitch(switches::kExtensionsUpdateFrequency)) {
 322       base::StringToInt(command_line->GetSwitchValueASCII(
 323           switches::kExtensionsUpdateFrequency),
 324           &update_frequency);
 325     }
 326     updater_.reset(new extensions::ExtensionUpdater(
 327         this,
 328         extension_prefs,
 329         profile->GetPrefs(),
 330         profile,
 331         update_frequency,
 332         extensions::ExtensionsBrowserClient::Get()->GetExtensionCache(),
 333         base::Bind(ChromeExtensionDownloaderFactory::CreateForProfile,
 334                    profile)));
 335   }
 336
 337   component_loader_.reset(
 338       new extensions::ComponentLoader(this,
 339                                       profile->GetPrefs(),
 340                                       g_browser_process->local_state(),
 341                                       profile));
 342
 343   if (extensions_enabled_) {
 344     extensions::ExternalProviderImpl::CreateExternalProviders(
 345         this, profile_, &external_extension_providers_);
 346   }
 347
 348   // Set this as the ExtensionService for app sorting to ensure it causes syncs
 349   // if required.
 350   is_first_run_ = !extension_prefs_->SetAlertSystemFirstRun();
 351
 352   error_controller_.reset(
 353       new extensions::ExtensionErrorController(profile_, is_first_run_));
 354   external_install_manager_.reset(
 355       new extensions::ExternalInstallManager(profile_, is_first_run_));
 356
 357   extension_action_storage_manager_.reset(
 358       new extensions::ExtensionActionStorageManager(profile_));
 359
 360   // How long is the path to the Extensions directory?
 361   UMA_HISTOGRAM_CUSTOM_COUNTS("Extensions.ExtensionRootPathLength",
 362                               install_directory_.value().length(), 0, 500, 100);
 363 }
 364
 365 extensions::PendingExtensionManager*
 366     ExtensionService::pending_extension_manager() {
 367   return &pending_extension_manager_;
 368 }
 369
 370 ExtensionService::~ExtensionService() {
 371   // No need to unload extensions here because they are profile-scoped, and the
 372   // profile is in the process of being deleted.
 373
 374   extensions::ProviderCollection::const_iterator i;
 375   for (i = external_extension_providers_.begin();
 376        i != external_extension_providers_.end(); ++i) {
 377     extensions::ExternalProviderInterface* provider = i->get();
 378     provider->ServiceShutdown();
 379   }
 380 }
 381
 382 void ExtensionService::Shutdown() {
 383   extensions::ExtensionManagementFactory::GetInstance()
 384       ->GetForBrowserContext(profile())
 385       ->RemoveObserver(this);
 386   system_->management_policy()->UnregisterProvider(
 387       shared_module_policy_provider_.get());
 388 }
 389
 390 const Extension* ExtensionService::GetExtensionById(
 391     const std::string& id, bool include_disabled) const {
 392   int include_mask = ExtensionRegistry::ENABLED;
 393   if (include_disabled) {
 394     // Include blacklisted and blocked extensions here because there are
 395     // hundreds of callers of this function, and many might assume that this
 396     // includes those that have been disabled due to blacklisting or blocking.
 397     include_mask |= ExtensionRegistry::DISABLED |
 398                     ExtensionRegistry::BLACKLISTED | ExtensionRegistry::BLOCKED;
 399   }
 400   return registry_->GetExtensionById(id, include_mask);
 401 }
 402
 403 void ExtensionService::Init() {
 404   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 405   TRACE_EVENT0("browser,startup", "ExtensionService::Init");
 406   TRACK_SCOPED_REGION("Startup", "ExtensionService::Init");
 407   SCOPED_UMA_HISTOGRAM_TIMER("Extensions.ExtensionServiceInitTime");
 408
 409   DCHECK(!is_ready());  // Can't redo init.
 410   DCHECK_EQ(registry_->enabled_extensions().size(), 0u);
 411
 412   // LoadAllExtensions() calls OnLoadedInstalledExtensions().
 413   component_loader_->LoadAll();
 414   extensions::InstalledLoader(this).LoadAllExtensions();
 415
 416   EnabledReloadableExtensions();
 417   MaybeFinishShutdownDelayed();
 418   SetReadyAndNotifyListeners();
 419
 420   // TODO(erikkay): this should probably be deferred to a future point
 421   // rather than running immediately at startup.
 422   CheckForExternalUpdates();
 423
 424   LoadGreylistFromPrefs();
 425 }
 426
 427 void ExtensionService::EnabledReloadableExtensions() {
 428   TRACE_EVENT0("browser,startup",
 429                "ExtensionService::EnabledReloadableExtensions");
 430
 431   std::vector<std::string> extensions_to_enable;
 432   const ExtensionSet& disabled_extensions = registry_->disabled_extensions();
 433   for (ExtensionSet::const_iterator iter = disabled_extensions.begin();
 434        iter != disabled_extensions.end(); ++iter) {
 435     const Extension* e = iter->get();
 436     if (extension_prefs_->GetDisableReasons(e->id()) ==
 437         Extension::DISABLE_RELOAD) {
 438       extensions_to_enable.push_back(e->id());
 439     }
 440   }
 441   for (const std::string& extension : extensions_to_enable) {
 442     EnableExtension(extension);
 443   }
 444 }
 445
 446 void ExtensionService::MaybeFinishShutdownDelayed() {
 447   TRACE_EVENT0("browser,startup",
 448                "ExtensionService::MaybeFinishShutdownDelayed");
 449
 450   scoped_ptr<extensions::ExtensionPrefs::ExtensionsInfo> delayed_info(
 451       extension_prefs_->GetAllDelayedInstallInfo());
 452   for (size_t i = 0; i < delayed_info->size(); ++i) {
 453     ExtensionInfo* info = delayed_info->at(i).get();
 454     scoped_refptr<const Extension> extension(NULL);
 455     if (info->extension_manifest) {
 456       std::string error;
 457       extension = Extension::Create(
 458           info->extension_path, info->extension_location,
 459           *info->extension_manifest,
 460           extension_prefs_->GetDelayedInstallCreationFlags(info->extension_id),
 461           info->extension_id, &error);
 462       if (extension.get())
 463         delayed_installs_.Insert(extension);
 464     }
 465   }
 466   MaybeFinishDelayedInstallations();
 467   scoped_ptr<extensions::ExtensionPrefs::ExtensionsInfo> delayed_info2(
 468       extension_prefs_->GetAllDelayedInstallInfo());
 469   UMA_HISTOGRAM_COUNTS_100("Extensions.UpdateOnLoad",
 470                            delayed_info2->size() - delayed_info->size());
 471 }
 472
 473 void ExtensionService::LoadGreylistFromPrefs() {
 474   TRACE_EVENT0("browser,startup", "ExtensionService::LoadGreylistFromPrefs");
 475
 476   scoped_ptr<ExtensionSet> all_extensions =
 477       registry_->GenerateInstalledExtensionsSet();
 478
 479   for (ExtensionSet::const_iterator it = all_extensions->begin();
 480        it != all_extensions->end(); ++it) {
 481     extensions::BlacklistState state =
 482         extension_prefs_->GetExtensionBlacklistState((*it)->id());
 483     if (state == extensions::BLACKLISTED_SECURITY_VULNERABILITY ||
 484         state == extensions::BLACKLISTED_POTENTIALLY_UNWANTED ||
 485         state == extensions::BLACKLISTED_CWS_POLICY_VIOLATION)
 486       greylist_.Insert(*it);
 487   }
 488 }
 489
 490 bool ExtensionService::UpdateExtension(const extensions::CRXFileInfo& file,
 491                                        bool file_ownership_passed,
 492                                        CrxInstaller** out_crx_installer) {
 493   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 494   if (browser_terminating_) {
 495     LOG(WARNING) << "Skipping UpdateExtension due to browser shutdown";
 496     // Leak the temp file at extension_path. We don't want to add to the disk
 497     // I/O burden at shutdown, we can't rely on the I/O completing anyway, and
 498     // the file is in the OS temp directory which should be cleaned up for us.
 499     return false;
 500   }
 501
 502   const std::string& id = file.extension_id;
 503
 504   const extensions::PendingExtensionInfo* pending_extension_info =
 505       pending_extension_manager()->GetById(id);
 506
 507   const Extension* extension = GetInstalledExtension(id);
 508   if (!pending_extension_info && !extension) {
 509     LOG(WARNING) << "Will not update extension " << id
 510                  << " because it is not installed or pending";
 511     // Delete extension_path since we're not creating a CrxInstaller
 512     // that would do it for us.
 513     if (!GetFileTaskRunner()->PostTask(
 514             FROM_HERE,
 515             base::Bind(&extensions::file_util::DeleteFile, file.path, false)))
 516       NOTREACHED();
 517
 518     return false;
 519   }
 520
 521   scoped_refptr<CrxInstaller> installer(
 522       CrxInstaller::Create(this, scoped_ptr<ExtensionInstallPrompt>()));
 523   installer->set_expected_id(id);
 524   installer->set_expected_hash(file.expected_hash);
 525   int creation_flags = Extension::NO_FLAGS;
 526   if (pending_extension_info) {
 527     installer->set_install_source(pending_extension_info->install_source());
 528     installer->set_allow_silent_install(true);
 529     if (pending_extension_info->remote_install())
 530       installer->set_grant_permissions(false);
 531     creation_flags = pending_extension_info->creation_flags();
 532     if (pending_extension_info->mark_acknowledged())
 533       external_install_manager_->AcknowledgeExternalExtension(id);
 534
 535     // If the extension came in disabled due to a permission increase, then
 536     // don't grant it all the permissions. crbug.com/484214
 537     if (extensions::ExtensionPrefs::Get(profile_)->HasDisableReason(
 538             id, Extension::DISABLE_PERMISSIONS_INCREASE)) {
 539       installer->set_grant_permissions(false);
 540     }
 541   } else if (extension) {
 542     installer->set_install_source(extension->location());
 543   }
 544   // If the extension was installed from or has migrated to the webstore, or
 545   // its auto-update URL is from the webstore, treat it as a webstore install.
 546   // Note that we ignore some older extensions with blank auto-update URLs
 547   // because we are mostly concerned with restrictions on NaCl extensions,
 548   // which are newer.
 549   if ((extension && extension->from_webstore()) ||
 550       (extension && extensions::ManifestURL::UpdatesFromGallery(extension)) ||
 551       (!extension && extension_urls::IsWebstoreUpdateUrl(
 552            pending_extension_info->update_url()))) {
 553     creation_flags |= Extension::FROM_WEBSTORE;
 554   }
 555
 556   // Bookmark apps being updated is kind of a contradiction, but that's because
 557   // we mark the default apps as bookmark apps, and they're hosted in the web
 558   // store, thus they can get updated. See http://crbug.com/101605 for more
 559   // details.
 560   if (extension && extension->from_bookmark())
 561     creation_flags |= Extension::FROM_BOOKMARK;
 562
 563   if (extension && extension->was_installed_by_default())
 564     creation_flags |= Extension::WAS_INSTALLED_BY_DEFAULT;
 565
 566   if (extension && extension->was_installed_by_oem())
 567     creation_flags |= Extension::WAS_INSTALLED_BY_OEM;
 568
 569   if (extension && extension->was_installed_by_custodian())
 570     creation_flags |= Extension::WAS_INSTALLED_BY_CUSTODIAN;
 571
 572   if (extension) {
 573     installer->set_is_ephemeral(extension_prefs_->IsEphemeralApp(id));
 574     installer->set_do_not_sync(extension_prefs_->DoNotSync(id));
 575   }
 576
 577   installer->set_creation_flags(creation_flags);
 578
 579   installer->set_delete_source(file_ownership_passed);
 580   installer->set_install_cause(extension_misc::INSTALL_CAUSE_UPDATE);
 581   installer->InstallCrxFile(file);
 582
 583   if (out_crx_installer)
 584     *out_crx_installer = installer.get();
 585
 586   return true;
 587 }
 588
 589 void ExtensionService::ReloadExtensionImpl(
 590     // "transient" because the process of reloading may cause the reference
 591     // to become invalid. Instead, use |extension_id|, a copy.
 592     const std::string& transient_extension_id,
 593     bool be_noisy) {
 594   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 595
 596   // If the extension is already reloading, don't reload again.
 597   if (extension_prefs_->GetDisableReasons(transient_extension_id) &
 598       Extension::DISABLE_RELOAD) {
 599     return;
 600   }
 601
 602   // Ignore attempts to reload a blacklisted or blocked extension. Sometimes
 603   // this can happen in a convoluted reload sequence triggered by the
 604   // termination of a blacklisted or blocked extension and a naive attempt to
 605   // reload it. For an example see http://crbug.com/373842.
 606   if (registry_->blacklisted_extensions().Contains(transient_extension_id) ||
 607       registry_->blocked_extensions().Contains(transient_extension_id)) {
 608     return;
 609   }
 610
 611   base::FilePath path;
 612
 613   std::string extension_id = transient_extension_id;
 614   const Extension* transient_current_extension =
 615       GetExtensionById(extension_id, false);
 616
 617   // Disable the extension if it's loaded. It might not be loaded if it crashed.
 618   if (transient_current_extension) {
 619     // If the extension has an inspector open for its background page, detach
 620     // the inspector and hang onto a cookie for it, so that we can reattach
 621     // later.
 622     // TODO(yoz): this is not incognito-safe!
 623     extensions::ProcessManager* manager =
 624         extensions::ProcessManager::Get(profile_);
 625     extensions::ExtensionHost* host =
 626         manager->GetBackgroundHostForExtension(extension_id);
 627     if (host && DevToolsAgentHost::HasFor(host->host_contents())) {
 628       // Look for an open inspector for the background page.
 629       scoped_refptr<DevToolsAgentHost> agent_host =
 630           DevToolsAgentHost::GetOrCreateFor(host->host_contents());
 631       agent_host->DisconnectWebContents();
 632       orphaned_dev_tools_[extension_id] = agent_host;
 633     }
 634
 635     path = transient_current_extension->path();
 636     // BeingUpgraded is set back to false when the extension is added.
 637     system_->runtime_data()->SetBeingUpgraded(transient_current_extension->id(),
 638                                               true);
 639     DisableExtension(extension_id, Extension::DISABLE_RELOAD);
 640     reloading_extensions_.insert(extension_id);
 641   } else {
 642     std::map<std::string, base::FilePath>::const_iterator iter =
 643         unloaded_extension_paths_.find(extension_id);
 644     if (iter == unloaded_extension_paths_.end()) {
 645       return;
 646     }
 647     path = unloaded_extension_paths_[extension_id];
 648   }
 649
 650   transient_current_extension = NULL;
 651
 652   if (delayed_installs_.Contains(extension_id)) {
 653     FinishDelayedInstallation(extension_id);
 654     return;
 655   }
 656
 657   // If we're reloading a component extension, use the component extension
 658   // loader's reloader.
 659   if (component_loader_->Exists(extension_id)) {
 660     component_loader_->Reload(extension_id);
 661     return;
 662   }
 663
 664   // Check the installed extensions to see if what we're reloading was already
 665   // installed.
 666   scoped_ptr<ExtensionInfo> installed_extension(
 667       extension_prefs_->GetInstalledExtensionInfo(extension_id));
 668   if (installed_extension.get() &&
 669       installed_extension->extension_manifest.get()) {
 670     extensions::InstalledLoader(this).Load(*installed_extension, false);
 671   } else {
 672     // Otherwise, the extension is unpacked (location LOAD).
 673     // We should always be able to remember the extension's path. If it's not in
 674     // the map, someone failed to update |unloaded_extension_paths_|.
 675     CHECK(!path.empty());
 676     scoped_refptr<extensions::UnpackedInstaller> unpacked_installer =
 677         extensions::UnpackedInstaller::Create(this);
 678     unpacked_installer->set_be_noisy_on_failure(be_noisy);
 679     unpacked_installer->Load(path);
 680   }
 681 }
 682
 683 void ExtensionService::ReloadExtension(const std::string& extension_id) {
 684   ReloadExtensionImpl(extension_id, true); // be_noisy
 685 }
 686
 687 void ExtensionService::ReloadExtensionWithQuietFailure(
 688     const std::string& extension_id) {
 689   ReloadExtensionImpl(extension_id, false); // be_noisy
 690 }
 691
 692 bool ExtensionService::UninstallExtension(
 693     // "transient" because the process of uninstalling may cause the reference
 694     // to become invalid. Instead, use |extenson->id()|.
 695     const std::string& transient_extension_id,
 696     extensions::UninstallReason reason,
 697     const base::Closure& deletion_done_callback,
 698     base::string16* error) {
 699   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 700
 701   scoped_refptr<const Extension> extension =
 702       GetInstalledExtension(transient_extension_id);
 703
 704   // Callers should not send us nonexistent extensions.
 705   CHECK(extension.get());
 706
 707   ManagementPolicy* by_policy = system_->management_policy();
 708   // Policy change which triggers an uninstall will always set
 709   // |external_uninstall| to true so this is the only way to uninstall
 710   // managed extensions.
 711   // Shared modules being uninstalled will also set |external_uninstall| to true
 712   // so that we can guarantee users don't uninstall a shared module.
 713   // (crbug.com/273300)
 714   // TODO(rdevlin.cronin): This is probably not right. We should do something
 715   // else, like include an enum IS_INTERNAL_UNINSTALL or IS_USER_UNINSTALL so
 716   // we don't do this.
 717   bool external_uninstall =
 718       (reason == extensions::UNINSTALL_REASON_INTERNAL_MANAGEMENT) ||
 719       (reason == extensions::UNINSTALL_REASON_COMPONENT_REMOVED) ||
 720       (reason == extensions::UNINSTALL_REASON_REINSTALL) ||
 721       (reason == extensions::UNINSTALL_REASON_ORPHANED_EXTERNAL_EXTENSION) ||
 722       (reason == extensions::UNINSTALL_REASON_ORPHANED_SHARED_MODULE) ||
 723       (reason == extensions::UNINSTALL_REASON_SYNC &&
 724        extension->was_installed_by_custodian());
 725   if (!external_uninstall &&
 726       (!by_policy->UserMayModifySettings(extension.get(), error) ||
 727        by_policy->MustRemainInstalled(extension.get(), error))) {
 728     content::NotificationService::current()->Notify(
 729         extensions::NOTIFICATION_EXTENSION_UNINSTALL_NOT_ALLOWED,
 730         content::Source<Profile>(profile_),
 731         content::Details<const Extension>(extension.get()));
 732     return false;
 733   }
 734
 735   InstallVerifier::Get(GetBrowserContext())->Remove(extension->id());
 736
 737   UMA_HISTOGRAM_ENUMERATION("Extensions.UninstallType",
 738                             extension->GetType(), 100);
 739   RecordPermissionMessagesHistogram(extension.get(), "Uninstall");
 740
 741   // Unload before doing more cleanup to ensure that nothing is hanging on to
 742   // any of these resources.
 743   UnloadExtension(extension->id(), UnloadedExtensionInfo::REASON_UNINSTALL);
 744
 745   // Tell the backend to start deleting installed extensions on the file thread.
 746   if (!Manifest::IsUnpackedLocation(extension->location())) {
 747     if (!GetFileTaskRunner()->PostTask(
 748             FROM_HERE,
 749             base::Bind(&ExtensionService::UninstallExtensionOnFileThread,
 750                        extension->id(),
 751                        profile_,
 752                        install_directory_,
 753                        extension->path())))
 754       NOTREACHED();
 755   }
 756
 757   extensions::DataDeleter::StartDeleting(
 758       profile_, extension.get(), deletion_done_callback);
 759
 760   UntrackTerminatedExtension(extension->id());
 761
 762   // Notify interested parties that we've uninstalled this extension.
 763   ExtensionRegistry::Get(profile_)
 764       ->TriggerOnUninstalled(extension.get(), reason);
 765
 766   // Don't sync the uninstall if we're going to reinstall the extension
 767   // momentarily.
 768   if (reason != extensions::UNINSTALL_REASON_REINSTALL) {
 769     ExtensionSyncService::Get(profile_)->SyncUninstallExtension(*extension);
 770   }
 771
 772   delayed_installs_.Remove(extension->id());
 773
 774   extension_prefs_->OnExtensionUninstalled(
 775       extension->id(), extension->location(), external_uninstall);
 776
 777   // Track the uninstallation.
 778   UMA_HISTOGRAM_ENUMERATION("Extensions.ExtensionUninstalled", 1, 2);
 779
 780   return true;
 781 }
 782
 783 // static
 784 void ExtensionService::UninstallExtensionOnFileThread(
 785     const std::string& id,
 786     Profile* profile,
 787     const base::FilePath& install_dir,
 788     const base::FilePath& extension_path) {
 789   extensions::ExtensionAssetsManager* assets_manager =
 790       extensions::ExtensionAssetsManager::GetInstance();
 791   assets_manager->UninstallExtension(id, profile, install_dir, extension_path);
 792 }
 793
 794 bool ExtensionService::IsExtensionEnabled(
 795     const std::string& extension_id) const {
 796   if (registry_->enabled_extensions().Contains(extension_id) ||
 797       registry_->terminated_extensions().Contains(extension_id)) {
 798     return true;
 799   }
 800
 801   if (registry_->disabled_extensions().Contains(extension_id) ||
 802       registry_->blacklisted_extensions().Contains(extension_id) ||
 803       registry_->blocked_extensions().Contains(extension_id)) {
 804     return false;
 805   }
 806
 807   // Blocked extensions aren't marked as such in prefs, thus if
 808   // |block_extensions_| is true then CanBlockExtension() must be called with an
 809   // Extension object. If the |extension_id| is not loaded, assume not enabled.
 810   if (block_extensions_) {
 811     const Extension* extension = GetInstalledExtension(extension_id);
 812     if (!extension || CanBlockExtension(extension))
 813       return false;
 814   }
 815
 816   // If the extension hasn't been loaded yet, check the prefs for it. Assume
 817   // enabled unless otherwise noted.
 818   return !extension_prefs_->IsExtensionDisabled(extension_id) &&
 819          !extension_prefs_->IsExtensionBlacklisted(extension_id) &&
 820          !extension_prefs_->IsExternalExtensionUninstalled(extension_id);
 821 }
 822
 823 void ExtensionService::EnableExtension(const std::string& extension_id) {
 824   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 825
 826   if (IsExtensionEnabled(extension_id))
 827     return;
 828   const Extension* extension =
 829       registry_->disabled_extensions().GetByID(extension_id);
 830
 831   ManagementPolicy* policy = system_->management_policy();
 832   if (extension && policy->MustRemainDisabled(extension, NULL, NULL)) {
 833     UMA_HISTOGRAM_COUNTS_100("Extensions.EnableDeniedByPolicy", 1);
 834     return;
 835   }
 836
 837   extension_prefs_->SetExtensionState(extension_id, Extension::ENABLED);
 838   extension_prefs_->ClearDisableReasons(extension_id);
 839
 840   // This can happen if sync enables an extension that is not
 841   // installed yet.
 842   if (!extension)
 843     return;
 844
 845   // Move it over to the enabled list.
 846   registry_->AddEnabled(make_scoped_refptr(extension));
 847   registry_->RemoveDisabled(extension->id());
 848
 849   NotifyExtensionLoaded(extension);
 850
 851   // Notify listeners that the extension was enabled.
 852   content::NotificationService::current()->Notify(
 853       extensions::NOTIFICATION_EXTENSION_ENABLED,
 854       content::Source<Profile>(profile_),
 855       content::Details<const Extension>(extension));
 856
 857   ExtensionSyncService::Get(profile_)->SyncExtensionChangeIfNeeded(*extension);
 858 }
 859
 860 void ExtensionService::DisableExtension(const std::string& extension_id,
 861                                         int disable_reasons) {
 862   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 863
 864   // The extension may have been disabled already. Just add a disable reason.
 865   if (!IsExtensionEnabled(extension_id)) {
 866     extension_prefs_->AddDisableReasons(extension_id, disable_reasons);
 867     return;
 868   }
 869
 870   const Extension* extension = GetInstalledExtension(extension_id);
 871   // |extension| can be NULL if sync disables an extension that is not
 872   // installed yet.
 873   // EXTERNAL_COMPONENT extensions are not generally modifiable by users, but
 874   // can be uninstalled by the browser if the user sets extension-specific
 875   // preferences.
 876   if (extension &&
 877       !(disable_reasons & Extension::DISABLE_RELOAD) &&
 878       !(disable_reasons & Extension::DISABLE_UPDATE_REQUIRED_BY_POLICY) &&
 879       !system_->management_policy()->UserMayModifySettings(extension, NULL) &&
 880       extension->location() != Manifest::EXTERNAL_COMPONENT) {
 881     return;
 882   }
 883
 884   extension_prefs_->SetExtensionState(extension_id, Extension::DISABLED);
 885   extension_prefs_->AddDisableReasons(extension_id, disable_reasons);
 886
 887   int include_mask =
 888       ExtensionRegistry::EVERYTHING & ~ExtensionRegistry::DISABLED;
 889   extension = registry_->GetExtensionById(extension_id, include_mask);
 890   if (!extension)
 891     return;
 892
 893   // The extension is either enabled or terminated.
 894   DCHECK(registry_->enabled_extensions().Contains(extension->id()) ||
 895          registry_->terminated_extensions().Contains(extension->id()));
 896
 897   // Move it over to the disabled list. Don't send a second unload notification
 898   // for terminated extensions being disabled.
 899   registry_->AddDisabled(make_scoped_refptr(extension));
 900   if (registry_->enabled_extensions().Contains(extension->id())) {
 901     registry_->RemoveEnabled(extension->id());
 902     NotifyExtensionUnloaded(extension, UnloadedExtensionInfo::REASON_DISABLE);
 903   } else {
 904     registry_->RemoveTerminated(extension->id());
 905   }
 906
 907   ExtensionSyncService::Get(profile_)->SyncExtensionChangeIfNeeded(*extension);
 908 }
 909
 910 void ExtensionService::DisableUserExtensions(
 911     const std::vector<std::string>& except_ids) {
 912   extensions::ManagementPolicy* management_policy =
 913       system_->management_policy();
 914   extensions::ExtensionList to_disable;
 915
 916   const ExtensionSet& enabled_set = registry_->enabled_extensions();
 917   for (ExtensionSet::const_iterator extension = enabled_set.begin();
 918       extension != enabled_set.end(); ++extension) {
 919     if (management_policy->UserMayModifySettings(extension->get(), NULL))
 920       to_disable.push_back(*extension);
 921   }
 922   const ExtensionSet& terminated_set = registry_->terminated_extensions();
 923   for (ExtensionSet::const_iterator extension = terminated_set.begin();
 924       extension != terminated_set.end(); ++extension) {
 925     if (management_policy->UserMayModifySettings(extension->get(), NULL))
 926       to_disable.push_back(*extension);
 927   }
 928
 929   for (extensions::ExtensionList::const_iterator extension = to_disable.begin();
 930       extension != to_disable.end(); ++extension) {
 931     if ((*extension)->was_installed_by_default() &&
 932         extension_urls::IsWebstoreUpdateUrl(
 933             extensions::ManifestURL::GetUpdateURL(extension->get())))
 934       continue;
 935     const std::string& id = (*extension)->id();
 936     if (except_ids.end() == std::find(except_ids.begin(), except_ids.end(), id))
 937       DisableExtension(id, extensions::Extension::DISABLE_USER_ACTION);
 938   }
 939 }
 940
 941 // Extensions that are not locked, components or forced by policy should be
 942 // locked. Extensions are no longer considered enabled or disabled. Blacklisted
 943 // extensions are now considered both blacklisted and locked.
 944 void ExtensionService::BlockAllExtensions() {
 945   if (block_extensions_)
 946     return;
 947   block_extensions_ = true;
 948
 949   // Blacklisted extensions are already unloaded, need not be blocked.
 950   scoped_ptr<ExtensionSet> extensions =
 951       registry_->GenerateInstalledExtensionsSet(ExtensionRegistry::ENABLED |
 952                                                 ExtensionRegistry::DISABLED |
 953                                                 ExtensionRegistry::TERMINATED);
 954
 955   for (const scoped_refptr<const Extension>& extension : *extensions) {
 956     const std::string& id = extension->id();
 957
 958     if (!CanBlockExtension(extension.get()))
 959       continue;
 960
 961     registry_->RemoveEnabled(id);
 962     registry_->RemoveDisabled(id);
 963     registry_->RemoveTerminated(id);
 964
 965     registry_->AddBlocked(extension.get());
 966     UnloadExtension(id, extensions::UnloadedExtensionInfo::REASON_LOCK_ALL);
 967   }
 968 }
 969
 970 // All locked extensions should revert to being either enabled or disabled
 971 // as appropriate.
 972 void ExtensionService::UnblockAllExtensions() {
 973   block_extensions_ = false;
 974   scoped_ptr<ExtensionSet> to_unblock =
 975       registry_->GenerateInstalledExtensionsSet(ExtensionRegistry::BLOCKED);
 976
 977   for (const scoped_refptr<const Extension>& extension : *to_unblock) {
 978     registry_->RemoveBlocked(extension->id());
 979     AddExtension(extension.get());
 980   }
 981 }
 982
 983 void ExtensionService::GrantPermissionsAndEnableExtension(
 984     const Extension* extension) {
 985   GrantPermissions(extension);
 986   RecordPermissionMessagesHistogram(extension, "ReEnable");
 987   EnableExtension(extension->id());
 988 }
 989
 990 void ExtensionService::GrantPermissions(const Extension* extension) {
 991   CHECK(extension);
 992   extensions::PermissionsUpdater(profile()).GrantActivePermissions(extension);
 993 }
 994
 995 // static
 996 void ExtensionService::RecordPermissionMessagesHistogram(
 997     const Extension* extension, const char* histogram) {
 998   // Since this is called from multiple sources, and since the histogram macros
 999   // use statics, we need to manually lookup the histogram ourselves.
1000   base::HistogramBase* counter = base::LinearHistogram::FactoryGet(
1001       base::StringPrintf("Extensions.Permissions_%s3", histogram),
1002       1,
1003       APIPermission::kEnumBoundary,
1004       APIPermission::kEnumBoundary + 1,
1005       base::HistogramBase::kUmaTargetedHistogramFlag);
1006
1007   base::HistogramBase* counter_has_any = base::BooleanHistogram::FactoryGet(
1008       base::StringPrintf("Extensions.HasPermissions_%s3", histogram),
1009       base::HistogramBase::kUmaTargetedHistogramFlag);
1010
1011   PermissionIDSet permissions =
1012       extensions::PermissionMessageProvider::Get()->GetAllPermissionIDs(
1013           extension->permissions_data()->active_permissions().get(),
1014           extension->GetType());
1015   counter_has_any->AddBoolean(!permissions.empty());
1016   for (const PermissionID& id : permissions)
1017     counter->Add(id.id());
1018 }
1019
1020 void ExtensionService::NotifyExtensionLoaded(const Extension* extension) {
1021   // The URLRequestContexts need to be first to know that the extension
1022   // was loaded, otherwise a race can arise where a renderer that is created
1023   // for the extension may try to load an extension URL with an extension id
1024   // that the request context doesn't yet know about. The profile is responsible
1025   // for ensuring its URLRequestContexts appropriately discover the loaded
1026   // extension.
1027   system_->RegisterExtensionWithRequestContexts(
1028       extension,
1029       base::Bind(&ExtensionService::OnExtensionRegisteredWithRequestContexts,
1030                  AsWeakPtr(), make_scoped_refptr(extension)));
1031
1032   // Tell renderers about the new extension, unless it's a theme (renderers
1033   // don't need to know about themes).
1034   if (!extension->is_theme()) {
1035     for (content::RenderProcessHost::iterator i(
1036             content::RenderProcessHost::AllHostsIterator());
1037          !i.IsAtEnd(); i.Advance()) {
1038       content::RenderProcessHost* host = i.GetCurrentValue();
1039       Profile* host_profile =
1040           Profile::FromBrowserContext(host->GetBrowserContext());
1041       if (host_profile->GetOriginalProfile() ==
1042           profile_->GetOriginalProfile()) {
1043         // We don't need to include tab permisisons here, since the extension
1044         // was just loaded.
1045         std::vector<ExtensionMsg_Loaded_Params> loaded_extensions(
1046             1, ExtensionMsg_Loaded_Params(extension,
1047                                           false /* no tab permissions */));
1048         host->Send(
1049             new ExtensionMsg_Loaded(loaded_extensions));
1050       }
1051     }
1052   }
1053
1054   // Tell subsystems that use the EXTENSION_LOADED notification about the new
1055   // extension.
1056   //
1057   // NOTE: It is important that this happen after notifying the renderers about
1058   // the new extensions so that if we navigate to an extension URL in
1059   // ExtensionRegistryObserver::OnLoaded or
1060   // NOTIFICATION_EXTENSION_LOADED_DEPRECATED, the
1061   // renderer is guaranteed to know about it.
1062   registry_->TriggerOnLoaded(extension);
1063
1064   content::NotificationService::current()->Notify(
1065       extensions::NOTIFICATION_EXTENSION_LOADED_DEPRECATED,
1066       content::Source<Profile>(profile_),
1067       content::Details<const Extension>(extension));
1068
1069   // TODO(kalman): Convert ExtensionSpecialStoragePolicy to a
1070   // BrowserContextKeyedService and use ExtensionRegistryObserver.
1071   profile_->GetExtensionSpecialStoragePolicy()->
1072       GrantRightsForExtension(extension, profile_);
1073
1074   // TODO(kalman): This is broken. The crash reporter is process-wide so doesn't
1075   // work properly multi-profile. Besides which, it should be using
1076   // ExtensionRegistryObserver. See http://crbug.com/355029.
1077   UpdateActiveExtensionsInCrashReporter();
1078
1079   const extensions::PermissionsData* permissions_data =
1080       extension->permissions_data();
1081
1082   // If the extension has permission to load chrome://favicon/ resources we need
1083   // to make sure that the FaviconSource is registered with the
1084   // ChromeURLDataManager.
1085   if (permissions_data->HasHostPermission(GURL(chrome::kChromeUIFaviconURL))) {
1086     FaviconSource* favicon_source = new FaviconSource(profile_,
1087                                                       FaviconSource::FAVICON);
1088     content::URLDataSource::Add(profile_, favicon_source);
1089   }
1090
1091   // Same for chrome://theme/ resources.
1092   if (permissions_data->HasHostPermission(GURL(chrome::kChromeUIThemeURL))) {
1093     ThemeSource* theme_source = new ThemeSource(profile_);
1094     content::URLDataSource::Add(profile_, theme_source);
1095   }
1096
1097   // Same for chrome://thumb/ resources.
1098   if (permissions_data->HasHostPermission(
1099           GURL(chrome::kChromeUIThumbnailURL))) {
1100     ThumbnailSource* thumbnail_source = new ThumbnailSource(profile_, false);
1101     content::URLDataSource::Add(profile_, thumbnail_source);
1102   }
1103 }
1104
1105 void ExtensionService::OnExtensionRegisteredWithRequestContexts(
1106     scoped_refptr<const extensions::Extension> extension) {
1107   registry_->AddReady(extension);
1108   if (registry_->enabled_extensions().Contains(extension->id()))
1109     registry_->TriggerOnReady(extension.get());
1110 }
1111
1112 void ExtensionService::NotifyExtensionUnloaded(
1113     const Extension* extension,
1114     UnloadedExtensionInfo::Reason reason) {
1115   UnloadedExtensionInfo details(extension, reason);
1116
1117   registry_->TriggerOnUnloaded(extension, reason);
1118
1119   content::NotificationService::current()->Notify(
1120       extensions::NOTIFICATION_EXTENSION_UNLOADED_DEPRECATED,
1121       content::Source<Profile>(profile_),
1122       content::Details<UnloadedExtensionInfo>(&details));
1123
1124   for (content::RenderProcessHost::iterator i(
1125           content::RenderProcessHost::AllHostsIterator());
1126        !i.IsAtEnd(); i.Advance()) {
1127     content::RenderProcessHost* host = i.GetCurrentValue();
1128     Profile* host_profile =
1129         Profile::FromBrowserContext(host->GetBrowserContext());
1130     if (host_profile->GetOriginalProfile() == profile_->GetOriginalProfile())
1131       host->Send(new ExtensionMsg_Unloaded(extension->id()));
1132   }
1133
1134   system_->UnregisterExtensionWithRequestContexts(extension->id(), reason);
1135
1136   // TODO(kalman): Convert ExtensionSpecialStoragePolicy to a
1137   // BrowserContextKeyedService and use ExtensionRegistryObserver.
1138   profile_->GetExtensionSpecialStoragePolicy()->
1139       RevokeRightsForExtension(extension);
1140
1141 #if defined(OS_CHROMEOS)
1142   // Revoke external file access for the extension from its file system context.
1143   // It is safe to access the extension's storage partition at this point. The
1144   // storage partition may get destroyed only after the extension gets unloaded.
1145   GURL site =
1146       extensions::util::GetSiteForExtensionId(extension->id(), profile_);
1147   storage::FileSystemContext* filesystem_context =
1148       BrowserContext::GetStoragePartitionForSite(profile_, site)
1149           ->GetFileSystemContext();
1150   if (filesystem_context && filesystem_context->external_backend()) {
1151     filesystem_context->external_backend()->
1152         RevokeAccessForExtension(extension->id());
1153   }
1154 #endif
1155
1156   // TODO(kalman): This is broken. The crash reporter is process-wide so doesn't
1157   // work properly multi-profile. Besides which, it should be using
1158   // ExtensionRegistryObserver::OnExtensionLoaded. See http://crbug.com/355029.
1159   UpdateActiveExtensionsInCrashReporter();
1160 }
1161
1162 content::BrowserContext* ExtensionService::GetBrowserContext() const {
1163   // Implemented in the .cc file to avoid adding a profile.h dependency to
1164   // extension_service.h.
1165   return profile_;
1166 }
1167
1168 bool ExtensionService::is_ready() {
1169   return ready_->is_signaled();
1170 }
1171
1172 base::SequencedTaskRunner* ExtensionService::GetFileTaskRunner() {
1173   if (file_task_runner_.get())
1174     return file_task_runner_.get();
1175
1176   // We should be able to interrupt any part of extension install process during
1177   // shutdown. SKIP_ON_SHUTDOWN ensures that not started extension install tasks
1178   // will be ignored/deleted while we will block on started tasks.
1179   std::string token("ext_install-");
1180   token.append(profile_->GetPath().AsUTF8Unsafe());
1181   file_task_runner_ = BrowserThread::GetBlockingPool()->
1182       GetSequencedTaskRunnerWithShutdownBehavior(
1183         BrowserThread::GetBlockingPool()->GetNamedSequenceToken(token),
1184         base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
1185   return file_task_runner_.get();
1186 }
1187
1188 void ExtensionService::CheckManagementPolicy() {
1189   std::vector<std::string> to_unload;
1190   std::map<std::string, Extension::DisableReason> to_disable;
1191   std::vector<std::string> to_enable;
1192
1193   // Loop through the extensions list, finding extensions we need to unload or
1194   // disable.
1195   for (scoped_refptr<const Extension> extension :
1196        registry_->enabled_extensions()) {
1197     if (!system_->management_policy()->UserMayLoad(extension.get(), nullptr))
1198       to_unload.push_back(extension->id());
1199     Extension::DisableReason disable_reason = Extension::DISABLE_NONE;
1200     if (system_->management_policy()->MustRemainDisabled(
1201             extension.get(), &disable_reason, nullptr))
1202       to_disable[extension->id()] = disable_reason;
1203   }
1204
1205   extensions::ExtensionManagement* management =
1206       extensions::ExtensionManagementFactory::GetForBrowserContext(profile());
1207
1208   // Loop through the disabled extension list, find extensions to re-enable
1209   // automatically. These extensions are exclusive from the |to_disable| and
1210   // |to_unload| lists constructed above, since disabled_extensions() and
1211   // enabled_extensions() are supposed to be mutually exclusive.
1212   for (scoped_refptr<const Extension> extension :
1213        registry_->disabled_extensions()) {
1214     // Find all disabled extensions disabled due to minimum version requirement,
1215     // but now satisfying it.
1216     if (management->CheckMinimumVersion(extension.get(), nullptr) &&
1217         extension_prefs_->HasDisableReason(
1218             extension->id(), Extension::DISABLE_UPDATE_REQUIRED_BY_POLICY)) {
1219       // Is DISABLE_UPDATE_REQUIRED_BY_POLICY the *only* reason?
1220       if (extension_prefs_->GetDisableReasons(extension->id()) ==
1221           Extension::DISABLE_UPDATE_REQUIRED_BY_POLICY) {
1222         // We need to enable those disabled *only* due to minimum version
1223         // requirement.
1224         to_enable.push_back(extension->id());
1225       }
1226       extension_prefs_->RemoveDisableReason(
1227           extension->id(), Extension::DISABLE_UPDATE_REQUIRED_BY_POLICY);
1228     }
1229   }
1230
1231   for (const std::string& id : to_unload)
1232     UnloadExtension(id, UnloadedExtensionInfo::REASON_DISABLE);
1233
1234   for (std::map<std::string, Extension::DisableReason>::const_iterator i =
1235            to_disable.begin(); i != to_disable.end(); ++i)
1236     DisableExtension(i->first, i->second);
1237
1238   // No extension is getting re-enabled here after disabling/unloading
1239   // because to_enable is mutually exclusive to to_disable + to_unload.
1240   for (const std::string& id : to_enable)
1241     EnableExtension(id);
1242
1243   if (updater_.get()) {
1244     // Find all extensions disabled due to minimum version requirement from
1245     // policy (including the ones that got disabled just now), and check
1246     // for update.
1247     extensions::ExtensionUpdater::CheckParams to_recheck;
1248     for (scoped_refptr<const Extension> extension :
1249          registry_->disabled_extensions()) {
1250       if (extension_prefs_->GetDisableReasons(extension->id()) ==
1251           Extension::DISABLE_UPDATE_REQUIRED_BY_POLICY) {
1252         // The minimum version check is the only thing holding this extension
1253         // back, so check if it can be updated to fix that.
1254         to_recheck.ids.push_back(extension->id());
1255       }
1256     }
1257     if (!to_recheck.ids.empty())
1258       updater_->CheckNow(to_recheck);
1259   }
1260 }
1261
1262 void ExtensionService::CheckForUpdatesSoon() {
1263   // This can legitimately happen in unit tests.
1264   if (!updater_.get())
1265     return;
1266
1267   if (AreAllExternalProvidersReady()) {
1268     updater_->CheckSoon();
1269   } else {
1270     // Sync can start updating before all the external providers are ready
1271     // during startup. Start the update as soon as those providers are ready,
1272     // but not before.
1273     update_once_all_providers_are_ready_ = true;
1274   }
1275 }
1276
1277 // Some extensions will autoupdate themselves externally from Chrome.  These
1278 // are typically part of some larger client application package. To support
1279 // these, the extension will register its location in the preferences file
1280 // (and also, on Windows, in the registry) and this code will periodically
1281 // check that location for a .crx file, which it will then install locally if
1282 // a new version is available.
1283 // Errors are reported through ExtensionErrorReporter. Success is not
1284 // reported.
1285 void ExtensionService::CheckForExternalUpdates() {
1286   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
1287   TRACE_EVENT0("browser,startup", "ExtensionService::CheckForExternalUpdates");
1288   SCOPED_UMA_HISTOGRAM_TIMER("Extensions.CheckForExternalUpdatesTime");
1289
1290   // Note that this installation is intentionally silent (since it didn't
1291   // go through the front-end).  Extensions that are registered in this
1292   // way are effectively considered 'pre-bundled', and so implicitly
1293   // trusted.  In general, if something has HKLM or filesystem access,
1294   // they could install an extension manually themselves anyway.
1295
1296   // Ask each external extension provider to give us a call back for each
1297   // extension they know about. See OnExternalExtension(File|UpdateUrl)Found.
1298   extensions::ProviderCollection::const_iterator i;
1299   for (i = external_extension_providers_.begin();
1300        i != external_extension_providers_.end(); ++i) {
1301     extensions::ExternalProviderInterface* provider = i->get();
1302     provider->VisitRegisteredExtension();
1303   }
1304
1305   // Do any required work that we would have done after completion of all
1306   // providers.
1307   if (external_extension_providers_.empty())
1308     OnAllExternalProvidersReady();
1309 }
1310
1311 void ExtensionService::OnExternalProviderReady(
1312     const extensions::ExternalProviderInterface* provider) {
1313   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
1314   CHECK(provider->IsReady());
1315
1316   // An external provider has finished loading.  We only take action
1317   // if all of them are finished. So we check them first.
1318   if (AreAllExternalProvidersReady())
1319     OnAllExternalProvidersReady();
1320 }
1321
1322 bool ExtensionService::AreAllExternalProvidersReady() const {
1323   extensions::ProviderCollection::const_iterator i;
1324   for (i = external_extension_providers_.begin();
1325        i != external_extension_providers_.end(); ++i) {
1326     if (!i->get()->IsReady())
1327       return false;
1328   }
1329   return true;
1330 }
1331
1332 void ExtensionService::OnAllExternalProvidersReady() {
1333   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
1334   base::TimeDelta elapsed = base::Time::Now() - profile_->GetStartTime();
1335   UMA_HISTOGRAM_TIMES("Extension.ExternalProvidersReadyAfter", elapsed);
1336
1337   // Install any pending extensions.
1338   if (update_once_all_providers_are_ready_ && updater()) {
1339     update_once_all_providers_are_ready_ = false;
1340     extensions::ExtensionUpdater::CheckParams params;
1341     params.callback = external_updates_finished_callback_;
1342     updater()->CheckNow(params);
1343   }
1344
1345   // Uninstall all the unclaimed extensions.
1346   scoped_ptr<extensions::ExtensionPrefs::ExtensionsInfo> extensions_info(
1347       extension_prefs_->GetInstalledExtensionsInfo());
1348   for (size_t i = 0; i < extensions_info->size(); ++i) {
1349     ExtensionInfo* info = extensions_info->at(i).get();
1350     if (Manifest::IsExternalLocation(info->extension_location))
1351       CheckExternalUninstall(info->extension_id);
1352   }
1353
1354   error_controller_->ShowErrorIfNeeded();
1355
1356   external_install_manager_->UpdateExternalExtensionAlert();
1357 }
1358
1359 void ExtensionService::UnloadExtension(
1360     const std::string& extension_id,
1361     UnloadedExtensionInfo::Reason reason) {
1362   // Make sure the extension gets deleted after we return from this function.
1363   int include_mask =
1364       ExtensionRegistry::EVERYTHING & ~ExtensionRegistry::TERMINATED;
1365   scoped_refptr<const Extension> extension(
1366       registry_->GetExtensionById(extension_id, include_mask));
1367
1368   // This method can be called via PostTask, so the extension may have been
1369   // unloaded by the time this runs.
1370   if (!extension.get()) {
1371     // In case the extension may have crashed/uninstalled. Allow the profile to
1372     // clean up its RequestContexts.
1373     system_->UnregisterExtensionWithRequestContexts(extension_id, reason);
1374     return;
1375   }
1376
1377   // Keep information about the extension so that we can reload it later
1378   // even if it's not permanently installed.
1379   unloaded_extension_paths_[extension->id()] = extension->path();
1380
1381   // Clean up if the extension is meant to be enabled after a reload.
1382   reloading_extensions_.erase(extension->id());
1383
1384   if (registry_->disabled_extensions().Contains(extension->id())) {
1385     registry_->RemoveDisabled(extension->id());
1386     // Make sure the profile cleans up its RequestContexts when an already
1387     // disabled extension is unloaded (since they are also tracking the disabled
1388     // extensions).
1389     system_->UnregisterExtensionWithRequestContexts(extension_id, reason);
1390     // Don't send the unloaded notification. It was sent when the extension
1391     // was disabled.
1392   } else {
1393     // Remove the extension from the enabled list.
1394     registry_->RemoveEnabled(extension->id());
1395     NotifyExtensionUnloaded(extension.get(), reason);
1396   }
1397
1398   content::NotificationService::current()->Notify(
1399       extensions::NOTIFICATION_EXTENSION_REMOVED,
1400       content::Source<Profile>(profile_),
1401       content::Details<const Extension>(extension.get()));
1402 }
1403
1404 void ExtensionService::RemoveComponentExtension(
1405     const std::string& extension_id) {
1406   scoped_refptr<const Extension> extension(
1407       GetExtensionById(extension_id, false));
1408   UnloadExtension(extension_id, UnloadedExtensionInfo::REASON_UNINSTALL);
1409   if (extension.get()) {
1410     ExtensionRegistry::Get(profile_)->TriggerOnUninstalled(
1411         extension.get(), extensions::UNINSTALL_REASON_COMPONENT_REMOVED);
1412   }
1413 }
1414
1415 void ExtensionService::UnloadAllExtensionsForTest() {
1416   UnloadAllExtensionsInternal();
1417 }
1418
1419 void ExtensionService::ReloadExtensionsForTest() {
1420   // Calling UnloadAllExtensionsForTest here triggers a false-positive presubmit
1421   // warning about calling test code in production.
1422   UnloadAllExtensionsInternal();
1423   component_loader_->LoadAll();
1424   extensions::InstalledLoader(this).LoadAllExtensions();
1425   // Don't call SetReadyAndNotifyListeners() since tests call this multiple
1426   // times.
1427 }
1428
1429 void ExtensionService::SetReadyAndNotifyListeners() {
1430   TRACE_EVENT0("browser,startup",
1431                "ExtensionService::SetReadyAndNotifyListeners");
1432   TRACK_SCOPED_REGION(
1433       "Startup", "ExtensionService::SetReadyAndNotifyListeners");
1434   SCOPED_UMA_HISTOGRAM_TIMER(
1435       "Extensions.ExtensionServiceNotifyReadyListenersTime");
1436
1437   ready_->Signal();
1438   content::NotificationService::current()->Notify(
1439       extensions::NOTIFICATION_EXTENSIONS_READY_DEPRECATED,
1440       content::Source<Profile>(profile_),
1441       content::NotificationService::NoDetails());
1442 }
1443
1444 void ExtensionService::OnLoadedInstalledExtensions() {
1445   if (updater_)
1446     updater_->Start();
1447
1448   OnBlacklistUpdated();
1449 }
1450
1451 void ExtensionService::AddExtension(const Extension* extension) {
1452   // TODO(jstritar): We may be able to get rid of this branch by overriding the
1453   // default extension state to DISABLED when the --disable-extensions flag
1454   // is set (http://crbug.com/29067).
1455   if (!extensions_enabled() &&
1456       !extension->is_theme() &&
1457       extension->location() != Manifest::COMPONENT &&
1458       !Manifest::IsExternalLocation(extension->location())) {
1459     return;
1460   }
1461
1462   bool is_extension_upgrade = false;
1463   bool is_extension_installed = false;
1464   const Extension* old = GetInstalledExtension(extension->id());
1465   if (old) {
1466     is_extension_installed = true;
1467     int version_compare_result =
1468         extension->version()->CompareTo(*(old->version()));
1469     is_extension_upgrade = version_compare_result > 0;
1470     // Other than for unpacked extensions, CrxInstaller should have guaranteed
1471     // that we aren't downgrading.
1472     if (!Manifest::IsUnpackedLocation(extension->location()))
1473       CHECK_GE(version_compare_result, 0);
1474   }
1475   // If the extension was disabled for a reload, then enable it.
1476   bool reloading = reloading_extensions_.erase(extension->id()) > 0;
1477
1478   // Set the upgraded bit; we consider reloads upgrades.
1479   system_->runtime_data()->SetBeingUpgraded(extension->id(),
1480                                             is_extension_upgrade || reloading);
1481
1482   // The extension is now loaded, remove its data from unloaded extension map.
1483   unloaded_extension_paths_.erase(extension->id());
1484
1485   // If a terminated extension is loaded, remove it from the terminated list.
1486   UntrackTerminatedExtension(extension->id());
1487
1488   // Check if the extension's privileges have changed and mark the
1489   // extension disabled if necessary.
1490   CheckPermissionsIncrease(extension, is_extension_installed);
1491
1492   if (is_extension_installed && !reloading) {
1493     // To upgrade an extension in place, unload the old one and then load the
1494     // new one.  ReloadExtension disables the extension, which is sufficient.
1495     UnloadExtension(extension->id(), UnloadedExtensionInfo::REASON_UPDATE);
1496   }
1497
1498   if (extension_prefs_->IsExtensionBlacklisted(extension->id())) {
1499     // Only prefs is checked for the blacklist. We rely on callers to check the
1500     // blacklist before calling into here, e.g. CrxInstaller checks before
1501     // installation then threads through the install and pending install flow
1502     // of this class, and we check when loading installed extensions.
1503     registry_->AddBlacklisted(extension);
1504   } else if (block_extensions_ && CanBlockExtension(extension)) {
1505     registry_->AddBlocked(extension);
1506   } else if (!reloading &&
1507              extension_prefs_->IsExtensionDisabled(extension->id())) {
1508     registry_->AddDisabled(extension);
1509     ExtensionSyncService::Get(profile_)->SyncExtensionChangeIfNeeded(
1510         *extension);
1511     content::NotificationService::current()->Notify(
1512         extensions::NOTIFICATION_EXTENSION_UPDATE_DISABLED,
1513         content::Source<Profile>(profile_),
1514         content::Details<const Extension>(extension));
1515
1516     // Show the extension disabled error if a permissions increase or a remote
1517     // installation is the reason it was disabled, and no other reasons exist.
1518     int reasons = extension_prefs_->GetDisableReasons(extension->id());
1519     const int kReasonMask = Extension::DISABLE_PERMISSIONS_INCREASE |
1520                             Extension::DISABLE_REMOTE_INSTALL;
1521     if (reasons & kReasonMask && !(reasons & ~kReasonMask)) {
1522       extensions::AddExtensionDisabledError(
1523           this,
1524           extension,
1525           extension_prefs_->HasDisableReason(
1526               extension->id(), Extension::DISABLE_REMOTE_INSTALL));
1527     }
1528   } else if (reloading) {
1529     // Replace the old extension with the new version.
1530     CHECK(!registry_->AddDisabled(extension));
1531     EnableExtension(extension->id());
1532   } else {
1533     // All apps that are displayed in the launcher are ordered by their ordinals
1534     // so we must ensure they have valid ordinals.
1535     if (extension->RequiresSortOrdinal()) {
1536       extension_prefs_->app_sorting()->SetExtensionVisible(
1537           extension->id(),
1538           extension->ShouldDisplayInNewTabPage() &&
1539               !extension_prefs_->IsEphemeralApp(extension->id()));
1540       if (!extension_prefs_->IsEphemeralApp(extension->id())) {
1541         extension_prefs_->app_sorting()->EnsureValidOrdinals(
1542             extension->id(), syncer::StringOrdinal());
1543       }
1544     }
1545
1546     registry_->AddEnabled(extension);
1547     ExtensionSyncService::Get(profile_)->SyncExtensionChangeIfNeeded(
1548         *extension);
1549     NotifyExtensionLoaded(extension);
1550   }
1551   system_->runtime_data()->SetBeingUpgraded(extension->id(), false);
1552 }
1553
1554 void ExtensionService::AddComponentExtension(const Extension* extension) {
1555   const std::string old_version_string(
1556       extension_prefs_->GetVersionString(extension->id()));
1557   const Version old_version(old_version_string);
1558
1559   VLOG(1) << "AddComponentExtension " << extension->name();
1560   if (!old_version.IsValid() || !old_version.Equals(*extension->version())) {
1561     VLOG(1) << "Component extension " << extension->name() << " ("
1562         << extension->id() << ") installing/upgrading from '"
1563         << old_version_string << "' to " << extension->version()->GetString();
1564
1565     AddNewOrUpdatedExtension(extension,
1566                              Extension::ENABLED,
1567                              extensions::kInstallFlagNone,
1568                              syncer::StringOrdinal(),
1569                              std::string());
1570     return;
1571   }
1572
1573   AddExtension(extension);
1574 }
1575
1576 void ExtensionService::CheckPermissionsIncrease(const Extension* extension,
1577                                                 bool is_extension_installed) {
1578   extensions::PermissionsUpdater(profile_).InitializePermissions(extension);
1579
1580   // We keep track of all permissions the user has granted each extension.
1581   // This allows extensions to gracefully support backwards compatibility
1582   // by including unknown permissions in their manifests. When the user
1583   // installs the extension, only the recognized permissions are recorded.
1584   // When the unknown permissions become recognized (e.g., through browser
1585   // upgrade), we can prompt the user to accept these new permissions.
1586   // Extensions can also silently upgrade to less permissions, and then
1587   // silently upgrade to a version that adds these permissions back.
1588   //
1589   // For example, pretend that Chrome 10 includes a permission "omnibox"
1590   // for an API that adds suggestions to the omnibox. An extension can
1591   // maintain backwards compatibility while still having "omnibox" in the
1592   // manifest. If a user installs the extension on Chrome 9, the browser
1593   // will record the permissions it recognized, not including "omnibox."
1594   // When upgrading to Chrome 10, "omnibox" will be recognized and Chrome
1595   // will disable the extension and prompt the user to approve the increase
1596   // in privileges. The extension could then release a new version that
1597   // removes the "omnibox" permission. When the user upgrades, Chrome will
1598   // still remember that "omnibox" had been granted, so that if the
1599   // extension once again includes "omnibox" in an upgrade, the extension
1600   // can upgrade without requiring this user's approval.
1601   int disable_reasons = extension_prefs_->GetDisableReasons(extension->id());
1602
1603   // Silently grant all active permissions to default apps and apps installed
1604   // in kiosk mode.
1605   bool auto_grant_permission =
1606       extension->was_installed_by_default() ||
1607       extensions::ExtensionsBrowserClient::Get()->IsRunningInForcedAppMode();
1608   if (auto_grant_permission)
1609     GrantPermissions(extension);
1610
1611   bool is_privilege_increase = false;
1612   // We only need to compare the granted permissions to the current permissions
1613   // if the extension has not been auto-granted its permissions above and is
1614   // installed internally.
1615   if (extension->location() == Manifest::INTERNAL && !auto_grant_permission) {
1616     // Add all the recognized permissions if the granted permissions list
1617     // hasn't been initialized yet.
1618     scoped_refptr<PermissionSet> granted_permissions =
1619         extension_prefs_->GetGrantedPermissions(extension->id());
1620     CHECK(granted_permissions.get());
1621
1622     // Here, we check if an extension's privileges have increased in a manner
1623     // that requires the user's approval. This could occur because the browser
1624     // upgraded and recognized additional privileges, or an extension upgrades
1625     // to a version that requires additional privileges.
1626     is_privilege_increase =
1627         extensions::PermissionMessageProvider::Get()->IsPrivilegeIncrease(
1628             granted_permissions.get(),
1629             extension->permissions_data()->active_permissions().get(),
1630             extension->GetType());
1631   }
1632
1633   if (is_extension_installed) {
1634     // If the extension was already disabled, suppress any alerts for becoming
1635     // disabled on permissions increase.
1636     bool previously_disabled =
1637         extension_prefs_->IsExtensionDisabled(extension->id());
1638     // Legacy disabled extensions do not have a disable reason. Infer that if
1639     // there was no permission increase, it was likely disabled by the user.
1640     if (previously_disabled && disable_reasons == Extension::DISABLE_NONE &&
1641         !extension_prefs_->DidExtensionEscalatePermissions(extension->id())) {
1642       disable_reasons |= Extension::DISABLE_USER_ACTION;
1643     }
1644     // Extensions that came to us disabled from sync need a similar inference,
1645     // except based on the new version's permissions.
1646     if (previously_disabled &&
1647         disable_reasons == Extension::DISABLE_UNKNOWN_FROM_SYNC) {
1648       // Remove the DISABLE_UNKNOWN_FROM_SYNC reason.
1649       extension_prefs_->ClearDisableReasons(extension->id());
1650       if (!is_privilege_increase)
1651         disable_reasons |= Extension::DISABLE_USER_ACTION;
1652     }
1653     disable_reasons &= ~Extension::DISABLE_UNKNOWN_FROM_SYNC;
1654   }
1655
1656   // Extension has changed permissions significantly. Disable it. A
1657   // notification should be sent by the caller. If the extension is already
1658   // disabled because it was installed remotely, don't add another disable
1659   // reason.
1660   if (is_privilege_increase &&
1661       disable_reasons != Extension::DISABLE_REMOTE_INSTALL) {
1662     disable_reasons |= Extension::DISABLE_PERMISSIONS_INCREASE;
1663     if (!extension_prefs_->DidExtensionEscalatePermissions(extension->id())) {
1664       RecordPermissionMessagesHistogram(extension, "AutoDisable");
1665     }
1666     extension_prefs_->SetExtensionState(extension->id(), Extension::DISABLED);
1667
1668 #if defined(ENABLE_SUPERVISED_USERS)
1669     // If a custodian-installed extension is disabled for a supervised user due
1670     // to a permissions increase, send a request to the custodian if the
1671     // supervised user themselves can't re-enable the extension.
1672     if (extensions::util::IsExtensionSupervised(extension, profile_) &&
1673         extensions::util::NeedCustodianApprovalForPermissionIncrease()) {
1674       SupervisedUserService* supervised_user_service =
1675           SupervisedUserServiceFactory::GetForProfile(profile_);
1676       supervised_user_service->AddExtensionUpdateRequest(
1677           extension->id(), *extension->version(),
1678           base::Bind(ExtensionUpdateRequestSent, extension->id()));
1679     }
1680 #endif
1681   }
1682   if (disable_reasons != Extension::DISABLE_NONE)
1683     extension_prefs_->AddDisableReasons(extension->id(), disable_reasons);
1684 }
1685
1686 void ExtensionService::UpdateActiveExtensionsInCrashReporter() {
1687   std::set<std::string> extension_ids;
1688   const ExtensionSet& extensions = registry_->enabled_extensions();
1689   for (ExtensionSet::const_iterator iter = extensions.begin();
1690        iter != extensions.end(); ++iter) {
1691     const Extension* extension = iter->get();
1692     if (!extension->is_theme() && extension->location() != Manifest::COMPONENT)
1693       extension_ids.insert(extension->id());
1694   }
1695
1696   // TODO(kalman): This is broken. ExtensionService is per-profile.
1697   // crash_keys::SetActiveExtensions is per-process. See
1698   // http://crbug.com/355029.
1699   crash_keys::SetActiveExtensions(extension_ids);
1700 }
1701
1702 void ExtensionService::OnExtensionInstalled(
1703     const Extension* extension,
1704     const syncer::StringOrdinal& page_ordinal,
1705     int install_flags) {
1706   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
1707
1708   const std::string& id = extension->id();
1709   int disable_reasons = GetDisableReasonsOnInstalled(extension);
1710   std::string install_parameter;
1711   const extensions::PendingExtensionInfo* pending_extension_info =
1712       pending_extension_manager()->GetById(id);
1713   if (pending_extension_info) {
1714     if (!pending_extension_info->ShouldAllowInstall(extension)) {
1715       pending_extension_manager()->Remove(id);
1716
1717       LOG(WARNING) << "ShouldAllowInstall() returned false for "
1718                    << id << " of type " << extension->GetType()
1719                    << " and update URL "
1720                    << extensions::ManifestURL::GetUpdateURL(extension).spec()
1721                    << "; not installing";
1722
1723       // Delete the extension directory since we're not going to
1724       // load it.
1725       if (!GetFileTaskRunner()->PostTask(
1726               FROM_HERE,
1727               base::Bind(&extensions::file_util::DeleteFile,
1728                          extension->path(),
1729                          true))) {
1730         NOTREACHED();
1731       }
1732       return;
1733     }
1734
1735     install_parameter = pending_extension_info->install_parameter();
1736     pending_extension_manager()->Remove(id);
1737   } else {
1738     // We explicitly want to re-enable an uninstalled external
1739     // extension; if we're here, that means the user is manually
1740     // installing the extension.
1741     if (extension_prefs_->IsExternalExtensionUninstalled(id)) {
1742       disable_reasons = Extension::DISABLE_NONE;
1743     }
1744   }
1745
1746   // Unsupported requirements overrides the management policy.
1747   if (install_flags & extensions::kInstallFlagHasRequirementErrors) {
1748     disable_reasons |= Extension::DISABLE_UNSUPPORTED_REQUIREMENT;
1749   } else {
1750     // Requirement is supported now, remove the corresponding disable reason
1751     // instead.
1752     extension_prefs_->RemoveDisableReason(
1753         id, Extension::DISABLE_UNSUPPORTED_REQUIREMENT);
1754     disable_reasons &= ~Extension::DISABLE_UNSUPPORTED_REQUIREMENT;
1755   }
1756
1757   // Check if the extension was disabled because of the minimum version
1758   // requirements from enterprise policy, and satisfies it now.
1759   if (extensions::ExtensionManagementFactory::GetForBrowserContext(profile())
1760           ->CheckMinimumVersion(extension, nullptr)) {
1761     // And remove the corresponding disable reason.
1762     extension_prefs_->RemoveDisableReason(
1763         id, Extension::DISABLE_UPDATE_REQUIRED_BY_POLICY);
1764     disable_reasons &= ~Extension::DISABLE_UPDATE_REQUIRED_BY_POLICY;
1765   }
1766
1767   if (install_flags & extensions::kInstallFlagIsBlacklistedForMalware) {
1768     // Installation of a blacklisted extension can happen from sync, policy,
1769     // etc, where to maintain consistency we need to install it, just never
1770     // load it (see AddExtension). Usually it should be the job of callers to
1771     // intercept blacklisted extensions earlier (e.g. CrxInstaller, before even
1772     // showing the install dialogue).
1773     extension_prefs_->AcknowledgeBlacklistedExtension(id);
1774     UMA_HISTOGRAM_ENUMERATION("ExtensionBlacklist.SilentInstall",
1775                               extension->location(),
1776                               Manifest::NUM_LOCATIONS);
1777   }
1778
1779   if (!GetInstalledExtension(extension->id())) {
1780     UMA_HISTOGRAM_ENUMERATION("Extensions.InstallType",
1781                               extension->GetType(), 100);
1782     UMA_HISTOGRAM_ENUMERATION("Extensions.InstallSource",
1783                               extension->location(), Manifest::NUM_LOCATIONS);
1784     RecordPermissionMessagesHistogram(extension, "Install");
1785   } else {
1786     UMA_HISTOGRAM_ENUMERATION("Extensions.UpdateType",
1787                               extension->GetType(), 100);
1788     UMA_HISTOGRAM_ENUMERATION("Extensions.UpdateSource",
1789                               extension->location(), Manifest::NUM_LOCATIONS);
1790
1791     // A fully installed app cannot be demoted to an ephemeral app.
1792     if ((install_flags & extensions::kInstallFlagIsEphemeral) &&
1793         !extension_prefs_->IsEphemeralApp(id)) {
1794       install_flags &= ~static_cast<int>(extensions::kInstallFlagIsEphemeral);
1795     }
1796   }
1797
1798   if (disable_reasons)
1799     extension_prefs_->AddDisableReasons(id, disable_reasons);
1800
1801   const Extension::State initial_state =
1802       disable_reasons == Extension::DISABLE_NONE ? Extension::ENABLED
1803                                                  : Extension::DISABLED;
1804
1805   if (ShouldDelayExtensionUpdate(
1806           id,
1807           !!(install_flags & extensions::kInstallFlagInstallImmediately))) {
1808     extension_prefs_->SetDelayedInstallInfo(
1809         extension,
1810         initial_state,
1811         install_flags,
1812         extensions::ExtensionPrefs::DELAY_REASON_WAIT_FOR_IDLE,
1813         page_ordinal,
1814         install_parameter);
1815
1816     // Transfer ownership of |extension|.
1817     delayed_installs_.Insert(extension);
1818
1819     // Notify observers that app update is available.
1820     FOR_EACH_OBSERVER(extensions::UpdateObserver, update_observers_,
1821                       OnAppUpdateAvailable(extension));
1822     return;
1823   }
1824
1825   extensions::SharedModuleService::ImportStatus status =
1826       shared_module_service_->SatisfyImports(extension);
1827   if (installs_delayed_for_gc_) {
1828     extension_prefs_->SetDelayedInstallInfo(
1829         extension,
1830         initial_state,
1831         install_flags,
1832         extensions::ExtensionPrefs::DELAY_REASON_GC,
1833         page_ordinal,
1834         install_parameter);
1835     delayed_installs_.Insert(extension);
1836   } else if (status != SharedModuleService::IMPORT_STATUS_OK) {
1837     if (status == SharedModuleService::IMPORT_STATUS_UNSATISFIED) {
1838       extension_prefs_->SetDelayedInstallInfo(
1839           extension,
1840           initial_state,
1841           install_flags,
1842           extensions::ExtensionPrefs::DELAY_REASON_WAIT_FOR_IMPORTS,
1843           page_ordinal,
1844           install_parameter);
1845       delayed_installs_.Insert(extension);
1846     }
1847   } else {
1848     AddNewOrUpdatedExtension(extension,
1849                              initial_state,
1850                              install_flags,
1851                              page_ordinal,
1852                              install_parameter);
1853   }
1854 }
1855
1856 void ExtensionService::OnExtensionManagementSettingsChanged() {
1857   error_controller_->ShowErrorIfNeeded();
1858
1859   // Revokes blocked permissions from active_permissions for all extensions.
1860   extensions::ExtensionManagement* settings =
1861       extensions::ExtensionManagementFactory::GetForBrowserContext(profile());
1862   CHECK(settings);
1863   scoped_ptr<ExtensionSet> all_extensions(
1864       registry_->GenerateInstalledExtensionsSet());
1865   for (const auto& extension : *all_extensions.get()) {
1866     if (!settings->IsPermissionSetAllowed(
1867             extension.get(),
1868             extension->permissions_data()->active_permissions())) {
1869       extensions::PermissionsUpdater(profile()).RemovePermissions(
1870           extension.get(),
1871           settings->GetBlockedPermissions(extension.get()).get());
1872     }
1873   }
1874
1875   CheckManagementPolicy();
1876 }
1877
1878 void ExtensionService::AddNewOrUpdatedExtension(
1879     const Extension* extension,
1880     Extension::State initial_state,
1881     int install_flags,
1882     const syncer::StringOrdinal& page_ordinal,
1883     const std::string& install_parameter) {
1884   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
1885   bool was_ephemeral = extension_prefs_->IsEphemeralApp(extension->id());
1886   extension_prefs_->OnExtensionInstalled(
1887       extension, initial_state, page_ordinal, install_flags, install_parameter);
1888   delayed_installs_.Remove(extension->id());
1889   if (InstallVerifier::NeedsVerification(*extension))
1890     InstallVerifier::Get(GetBrowserContext())->VerifyExtension(extension->id());
1891
1892   const Extension* old = GetInstalledExtension(extension->id());
1893   if (extensions::AppDataMigrator::NeedsMigration(old, extension)) {
1894     app_data_migrator_->DoMigrationAndReply(
1895         old, extension,
1896         base::Bind(&ExtensionService::FinishInstallation, AsWeakPtr(),
1897                    make_scoped_refptr(extension), was_ephemeral));
1898     return;
1899   }
1900
1901   FinishInstallation(extension, was_ephemeral);
1902 }
1903
1904 void ExtensionService::MaybeFinishDelayedInstallation(
1905     const std::string& extension_id) {
1906   // Check if the extension already got installed.
1907   if (!delayed_installs_.Contains(extension_id))
1908     return;
1909   extensions::ExtensionPrefs::DelayReason reason =
1910       extension_prefs_->GetDelayedInstallReason(extension_id);
1911
1912   // Check if the extension is idle. DELAY_REASON_NONE is used for older
1913   // preferences files that will not have set this field but it was previously
1914   // only used for idle updates.
1915   if ((reason == extensions::ExtensionPrefs::DELAY_REASON_WAIT_FOR_IDLE ||
1916        reason == extensions::ExtensionPrefs::DELAY_REASON_NONE) &&
1917        is_ready() && !extensions::util::IsExtensionIdle(extension_id, profile_))
1918     return;
1919
1920   const Extension* extension = delayed_installs_.GetByID(extension_id);
1921   if (reason == extensions::ExtensionPrefs::DELAY_REASON_WAIT_FOR_IMPORTS) {
1922     extensions::SharedModuleService::ImportStatus status =
1923         shared_module_service_->SatisfyImports(extension);
1924     if (status != SharedModuleService::IMPORT_STATUS_OK) {
1925       if (status == SharedModuleService::IMPORT_STATUS_UNRECOVERABLE) {
1926         delayed_installs_.Remove(extension_id);
1927         // Make sure no version of the extension is actually installed, (i.e.,
1928         // that this delayed install was not an update).
1929         CHECK(!extension_prefs_->GetInstalledExtensionInfo(extension_id).get());
1930         extension_prefs_->DeleteExtensionPrefs(extension_id);
1931       }
1932       return;
1933     }
1934   }
1935
1936   FinishDelayedInstallation(extension_id);
1937 }
1938
1939 void ExtensionService::FinishDelayedInstallation(
1940     const std::string& extension_id) {
1941   scoped_refptr<const Extension> extension(
1942       GetPendingExtensionUpdate(extension_id));
1943   CHECK(extension.get());
1944   delayed_installs_.Remove(extension_id);
1945
1946   bool was_ephemeral = extension_prefs_->IsEphemeralApp(extension->id());
1947   if (!extension_prefs_->FinishDelayedInstallInfo(extension_id))
1948     NOTREACHED();
1949
1950   FinishInstallation(extension.get(), was_ephemeral);
1951 }
1952
1953 void ExtensionService::FinishInstallation(
1954     const Extension* extension, bool was_ephemeral) {
1955   const extensions::Extension* existing_extension =
1956       GetInstalledExtension(extension->id());
1957   bool is_update = false;
1958   std::string old_name;
1959   if (existing_extension) {
1960     is_update = true;
1961     old_name = existing_extension->name();
1962   }
1963   bool from_ephemeral =
1964       was_ephemeral && !extension_prefs_->IsEphemeralApp(extension->id());
1965   extensions::InstalledExtensionInfo details(
1966       extension, is_update, from_ephemeral, old_name);
1967   content::NotificationService::current()->Notify(
1968       extensions::NOTIFICATION_EXTENSION_WILL_BE_INSTALLED_DEPRECATED,
1969       content::Source<Profile>(profile_),
1970       content::Details<const extensions::InstalledExtensionInfo>(&details));
1971
1972   registry_->TriggerOnWillBeInstalled(
1973       extension, is_update, from_ephemeral, old_name);
1974
1975   // Unpacked extensions default to allowing file access, but if that has been
1976   // overridden, don't reset the value.
1977   if (Manifest::ShouldAlwaysAllowFileAccess(extension->location()) &&
1978       !extension_prefs_->HasAllowFileAccessSetting(extension->id())) {
1979     extension_prefs_->SetAllowFileAccess(extension->id(), true);
1980   }
1981
1982   AddExtension(extension);
1983
1984   // Notify observers that need to know when an installation is complete.
1985   registry_->TriggerOnInstalled(extension, is_update);
1986
1987   // Check extensions that may have been delayed only because this shared module
1988   // was not available.
1989   if (SharedModuleInfo::IsSharedModule(extension))
1990     MaybeFinishDelayedInstallations();
1991 }
1992
1993 void ExtensionService::PromoteEphemeralApp(
1994     const extensions::Extension* extension, bool is_from_sync) {
1995   DCHECK(GetInstalledExtension(extension->id()) &&
1996          extension_prefs_->IsEphemeralApp(extension->id()));
1997
1998   if (extension->RequiresSortOrdinal()) {
1999     extension_prefs_->app_sorting()->SetExtensionVisible(
2000         extension->id(), extension->ShouldDisplayInNewTabPage());
2001
2002     if (!is_from_sync) {
2003       // Reset the sort ordinals of the app to ensure it is added to the default
2004       // position, like newly installed apps would.
2005       extension_prefs_->app_sorting()->ClearOrdinals(extension->id());
2006     }
2007
2008     extension_prefs_->app_sorting()->EnsureValidOrdinals(
2009         extension->id(), syncer::StringOrdinal());
2010   }
2011
2012   // Remove the ephemeral flags from the preferences.
2013   extension_prefs_->OnEphemeralAppPromoted(extension->id());
2014
2015   // Fire install-related events to allow observers to handle the promotion
2016   // of the ephemeral app.
2017   extensions::InstalledExtensionInfo details(
2018       extension,
2019       true /* is update */,
2020       true /* from ephemeral */,
2021       extension->name() /* old name */);
2022   content::NotificationService::current()->Notify(
2023       extensions::NOTIFICATION_EXTENSION_WILL_BE_INSTALLED_DEPRECATED,
2024       content::Source<Profile>(profile_),
2025       content::Details<const extensions::InstalledExtensionInfo>(&details));
2026
2027   registry_->TriggerOnWillBeInstalled(
2028       extension,
2029       true /* is update */,
2030       true /* from ephemeral */,
2031       extension->name() /* old name */);
2032
2033   if (registry_->enabled_extensions().Contains(extension->id())) {
2034     // If the app is already enabled and loaded, fire the load events to allow
2035     // observers to handle the promotion of the ephemeral app.
2036     content::NotificationService::current()->Notify(
2037         extensions::NOTIFICATION_EXTENSION_LOADED_DEPRECATED,
2038         content::Source<Profile>(profile_),
2039         content::Details<const Extension>(extension));
2040
2041     registry_->TriggerOnLoaded(extension);
2042   } else {
2043     // Cached ephemeral apps may be updated and disabled due to permissions
2044     // increase. The app can be enabled (as long as no other disable reasons
2045     // exist) as the install was user-acknowledged.
2046     int disable_mask = Extension::DISABLE_NONE;
2047     if (!is_from_sync)
2048       disable_mask |= Extension::DISABLE_PERMISSIONS_INCREASE;
2049
2050     int other_disable_reasons =
2051         extension_prefs_->GetDisableReasons(extension->id()) & ~disable_mask;
2052     if (!other_disable_reasons) {
2053       if (extension_prefs_->DidExtensionEscalatePermissions(extension->id()))
2054         GrantPermissionsAndEnableExtension(extension);
2055       else
2056         EnableExtension(extension->id());
2057     }
2058   }
2059
2060   registry_->TriggerOnInstalled(extension, true);
2061
2062   if (!is_from_sync) {
2063     ExtensionSyncService::Get(profile_)->SyncExtensionChangeIfNeeded(
2064         *extension);
2065   }
2066 }
2067
2068 const Extension* ExtensionService::GetPendingExtensionUpdate(
2069     const std::string& id) const {
2070   return delayed_installs_.GetByID(id);
2071 }
2072
2073 void ExtensionService::RegisterContentSettings(
2074     HostContentSettingsMap* host_content_settings_map) {
2075   TRACE_EVENT0("browser,startup", "ExtensionService::RegisterContentSettings");
2076   DCHECK_CURRENTLY_ON(BrowserThread::UI);
2077   host_content_settings_map->RegisterProvider(
2078       HostContentSettingsMap::INTERNAL_EXTENSION_PROVIDER,
2079       scoped_ptr<content_settings::ObservableProvider>(
2080           new content_settings::InternalExtensionProvider(profile_)));
2081
2082   host_content_settings_map->RegisterProvider(
2083       HostContentSettingsMap::CUSTOM_EXTENSION_PROVIDER,
2084       scoped_ptr<content_settings::ObservableProvider>(
2085           new content_settings::CustomExtensionProvider(
2086               extensions::ContentSettingsService::Get(
2087                   profile_)->content_settings_store(),
2088               profile_->GetOriginalProfile() != profile_)));
2089 }
2090
2091 void ExtensionService::TrackTerminatedExtension(
2092     const std::string& extension_id) {
2093   extensions_being_terminated_.erase(extension_id);
2094
2095   const Extension* extension = GetInstalledExtension(extension_id);
2096   if (!extension) {
2097     return;
2098   }
2099
2100   // No need to check for duplicates; inserting a duplicate is a no-op.
2101   registry_->AddTerminated(make_scoped_refptr(extension));
2102   UnloadExtension(extension->id(), UnloadedExtensionInfo::REASON_TERMINATE);
2103 }
2104
2105 void ExtensionService::TerminateExtension(const std::string& extension_id) {
2106   TrackTerminatedExtension(extension_id);
2107 }
2108
2109 void ExtensionService::UntrackTerminatedExtension(const std::string& id) {
2110   std::string lowercase_id = base::ToLowerASCII(id);
2111   const Extension* extension =
2112       registry_->terminated_extensions().GetByID(lowercase_id);
2113   registry_->RemoveTerminated(lowercase_id);
2114   if (extension) {
2115     content::NotificationService::current()->Notify(
2116         extensions::NOTIFICATION_EXTENSION_REMOVED,
2117         content::Source<Profile>(profile_),
2118         content::Details<const Extension>(extension));
2119   }
2120 }
2121
2122 const Extension* ExtensionService::GetInstalledExtension(
2123     const std::string& id) const {
2124   return registry_->GetExtensionById(id, ExtensionRegistry::EVERYTHING);
2125 }
2126
2127 bool ExtensionService::OnExternalExtensionFileFound(
2128          const std::string& id,
2129          const Version* version,
2130          const base::FilePath& path,
2131          Manifest::Location location,
2132          int creation_flags,
2133          bool mark_acknowledged,
2134          bool install_immediately) {
2135   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
2136   CHECK(crx_file::id_util::IdIsValid(id));
2137   if (extension_prefs_->IsExternalExtensionUninstalled(id))
2138     return false;
2139
2140   // Before even bothering to unpack, check and see if we already have this
2141   // version. This is important because these extensions are going to get
2142   // installed on every startup.
2143   const Extension* existing = GetExtensionById(id, true);
2144
2145   if (existing) {
2146     // The default apps will have the location set as INTERNAL. Since older
2147     // default apps are installed as EXTERNAL, we override them. However, if the
2148     // app is already installed as internal, then do the version check.
2149     // TODO(grv) : Remove after Q1-2013.
2150     bool is_default_apps_migration =
2151         (location == Manifest::INTERNAL &&
2152          Manifest::IsExternalLocation(existing->location()));
2153
2154     if (!is_default_apps_migration) {
2155       DCHECK(version);
2156
2157       switch (existing->version()->CompareTo(*version)) {
2158         case -1:  // existing version is older, we should upgrade
2159           break;
2160         case 0:  // existing version is same, do nothing
2161           return false;
2162         case 1:  // existing version is newer, uh-oh
2163           LOG(WARNING) << "Found external version of extension " << id
2164                        << "that is older than current version. Current version "
2165                        << "is: " << existing->VersionString() << ". New "
2166                        << "version is: " << version->GetString()
2167                        << ". Keeping current version.";
2168           return false;
2169       }
2170     }
2171   }
2172
2173   // If the extension is already pending, don't start an install.
2174   if (!pending_extension_manager()->AddFromExternalFile(
2175           id, location, *version, creation_flags, mark_acknowledged)) {
2176     return false;
2177   }
2178
2179   // no client (silent install)
2180   scoped_refptr<CrxInstaller> installer(CrxInstaller::CreateSilent(this));
2181   installer->set_install_source(location);
2182   installer->set_expected_id(id);
2183   installer->set_expected_version(*version);
2184   installer->set_install_cause(extension_misc::INSTALL_CAUSE_EXTERNAL_FILE);
2185   installer->set_install_immediately(install_immediately);
2186   installer->set_creation_flags(creation_flags);
2187 #if defined(OS_CHROMEOS)
2188   extensions::InstallLimiter::Get(profile_)->Add(installer, path);
2189 #else
2190   installer->InstallCrx(path);
2191 #endif
2192
2193   // Depending on the source, a new external extension might not need a user
2194   // notification on installation. For such extensions, mark them acknowledged
2195   // now to suppress the notification.
2196   if (mark_acknowledged)
2197     external_install_manager_->AcknowledgeExternalExtension(id);
2198
2199   return true;
2200 }
2201
2202 void ExtensionService::DidCreateRenderViewForBackgroundPage(
2203     extensions::ExtensionHost* host) {
2204   OrphanedDevTools::iterator iter =
2205       orphaned_dev_tools_.find(host->extension_id());
2206   if (iter == orphaned_dev_tools_.end())
2207     return;
2208
2209   iter->second->ConnectWebContents(host->host_contents());
2210   orphaned_dev_tools_.erase(iter);
2211 }
2212
2213 void ExtensionService::Observe(int type,
2214                                const content::NotificationSource& source,
2215                                const content::NotificationDetails& details) {
2216   switch (type) {
2217     case chrome::NOTIFICATION_APP_TERMINATING:
2218       // Shutdown has started. Don't start any more extension installs.
2219       // (We cannot use ExtensionService::Shutdown() for this because it
2220       // happens too late in browser teardown.)
2221       browser_terminating_ = true;
2222       break;
2223     case extensions::NOTIFICATION_EXTENSION_PROCESS_TERMINATED: {
2224       if (profile_ !=
2225           content::Source<Profile>(source).ptr()->GetOriginalProfile()) {
2226         break;
2227       }
2228
2229       extensions::ExtensionHost* host =
2230           content::Details<extensions::ExtensionHost>(details).ptr();
2231
2232       // If the extension is already being terminated, there is nothing left to
2233       // do.
2234       if (!extensions_being_terminated_.insert(host->extension_id()).second)
2235         break;
2236
2237       // Mark the extension as terminated and Unload it. We want it to
2238       // be in a consistent state: either fully working or not loaded
2239       // at all, but never half-crashed.  We do it in a PostTask so
2240       // that other handlers of this notification will still have
2241       // access to the Extension and ExtensionHost.
2242       base::ThreadTaskRunnerHandle::Get()->PostTask(
2243           FROM_HERE, base::Bind(&ExtensionService::TrackTerminatedExtension,
2244                                 AsWeakPtr(), host->extension()->id()));
2245       break;
2246     }
2247     case content::NOTIFICATION_RENDERER_PROCESS_TERMINATED: {
2248       content::RenderProcessHost* process =
2249           content::Source<content::RenderProcessHost>(source).ptr();
2250       Profile* host_profile =
2251           Profile::FromBrowserContext(process->GetBrowserContext());
2252       if (!profile_->IsSameProfile(host_profile->GetOriginalProfile()))
2253           break;
2254
2255       extensions::ProcessMap* process_map =
2256           extensions::ProcessMap::Get(profile_);
2257       if (process_map->Contains(process->GetID())) {
2258         // An extension process was terminated, this might have resulted in an
2259         // app or extension becoming idle.
2260         std::set<std::string> extension_ids =
2261             process_map->GetExtensionsInProcess(process->GetID());
2262         // In addition to the extensions listed in the process map, one of those
2263         // extensions could be referencing a shared module which is waiting for
2264         // idle to update.  Check all imports of these extensions, too.
2265         std::set<std::string> import_ids;
2266         for (std::set<std::string>::const_iterator it = extension_ids.begin();
2267              it != extension_ids.end();
2268              ++it) {
2269           const Extension* extension = GetExtensionById(*it, true);
2270           if (!extension)
2271             continue;
2272           const std::vector<SharedModuleInfo::ImportInfo>& imports =
2273               SharedModuleInfo::GetImports(extension);
2274           std::vector<SharedModuleInfo::ImportInfo>::const_iterator import_it;
2275           for (import_it = imports.begin(); import_it != imports.end();
2276                import_it++) {
2277             import_ids.insert((*import_it).extension_id);
2278           }
2279         }
2280         extension_ids.insert(import_ids.begin(), import_ids.end());
2281
2282         for (std::set<std::string>::const_iterator it = extension_ids.begin();
2283              it != extension_ids.end(); ++it) {
2284           if (delayed_installs_.Contains(*it)) {
2285             base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
2286                 FROM_HERE,
2287                 base::Bind(&ExtensionService::MaybeFinishDelayedInstallation,
2288                            AsWeakPtr(), *it),
2289                 base::TimeDelta::FromSeconds(kUpdateIdleDelay));
2290           }
2291         }
2292       }
2293
2294       process_map->RemoveAllFromProcess(process->GetID());
2295       BrowserThread::PostTask(
2296           BrowserThread::IO,
2297           FROM_HERE,
2298           base::Bind(&extensions::InfoMap::UnregisterAllExtensionsInProcess,
2299                      system_->info_map(),
2300                      process->GetID()));
2301       break;
2302     }
2303     case chrome::NOTIFICATION_UPGRADE_RECOMMENDED: {
2304       // Notify observers that chrome update is available.
2305       FOR_EACH_OBSERVER(extensions::UpdateObserver, update_observers_,
2306                         OnChromeUpdateAvailable());
2307       break;
2308     }
2309     case chrome::NOTIFICATION_PROFILE_DESTRUCTION_STARTED: {
2310       OnProfileDestructionStarted();
2311       break;
2312     }
2313
2314     default:
2315       NOTREACHED() << "Unexpected notification type.";
2316   }
2317 }
2318
2319 int ExtensionService::GetDisableReasonsOnInstalled(const Extension* extension) {
2320   Extension::DisableReason disable_reason;
2321   // Extensions disabled by management policy should always be disabled, even
2322   // if it's force-installed.
2323   if (system_->management_policy()->MustRemainDisabled(
2324           extension, &disable_reason, nullptr)) {
2325     // A specified reason is required to disable the extension.
2326     DCHECK(disable_reason != Extension::DISABLE_NONE);
2327     return disable_reason;
2328   }
2329
2330   // Extensions installed by policy can't be disabled. So even if a previous
2331   // installation disabled the extension, make sure it is now enabled.
2332   if (system_->management_policy()->MustRemainEnabled(extension, nullptr))
2333     return Extension::DISABLE_NONE;
2334
2335   // An already disabled extension should inherit the disable reasons and
2336   // remain disabled.
2337   if (extension_prefs_->IsExtensionDisabled(extension->id())) {
2338     int disable_reasons = extension_prefs_->GetDisableReasons(extension->id());
2339     // If an extension was disabled without specified reason, presume it's
2340     // disabled by user.
2341     return disable_reasons == Extension::DISABLE_NONE
2342                ? Extension::DISABLE_USER_ACTION
2343                : disable_reasons;
2344   }
2345
2346   if (FeatureSwitch::prompt_for_external_extensions()->IsEnabled()) {
2347     // External extensions are initially disabled. We prompt the user before
2348     // enabling them. Hosted apps are excepted because they are not dangerous
2349     // (they need to be launched by the user anyway).
2350     if (extension->GetType() != Manifest::TYPE_HOSTED_APP &&
2351         Manifest::IsExternalLocation(extension->location()) &&
2352         !extension_prefs_->IsExternalExtensionAcknowledged(extension->id())) {
2353       return Extension::DISABLE_EXTERNAL_EXTENSION;
2354     }
2355   }
2356
2357   return Extension::DISABLE_NONE;
2358 }
2359
2360 // Helper method to determine if an extension can be blocked.
2361 bool ExtensionService::CanBlockExtension(const Extension* extension) const {
2362   DCHECK(extension);
2363   return extension->location() != Manifest::COMPONENT &&
2364          extension->location() != Manifest::EXTERNAL_COMPONENT &&
2365          !system_->management_policy()->MustRemainEnabled(extension, NULL);
2366 }
2367
2368 bool ExtensionService::ShouldDelayExtensionUpdate(
2369     const std::string& extension_id,
2370     bool install_immediately) const {
2371   const char kOnUpdateAvailableEvent[] = "runtime.onUpdateAvailable";
2372
2373   // If delayed updates are globally disabled, or just for this extension,
2374   // don't delay.
2375   if (!install_updates_when_idle_ || install_immediately)
2376     return false;
2377
2378   const Extension* old = GetInstalledExtension(extension_id);
2379   // If there is no old extension, this is not an update, so don't delay.
2380   if (!old)
2381     return false;
2382
2383   if (extensions::BackgroundInfo::HasPersistentBackgroundPage(old)) {
2384     // Delay installation if the extension listens for the onUpdateAvailable
2385     // event.
2386     return extensions::EventRouter::Get(profile_)
2387         ->ExtensionHasEventListener(extension_id, kOnUpdateAvailableEvent);
2388   } else {
2389     // Delay installation if the extension is not idle.
2390     return !extensions::util::IsExtensionIdle(extension_id, profile_);
2391   }
2392 }
2393
2394 void ExtensionService::OnGarbageCollectIsolatedStorageStart() {
2395   DCHECK(!installs_delayed_for_gc_);
2396   installs_delayed_for_gc_ = true;
2397 }
2398
2399 void ExtensionService::OnGarbageCollectIsolatedStorageFinished() {
2400   DCHECK(installs_delayed_for_gc_);
2401   installs_delayed_for_gc_ = false;
2402   MaybeFinishDelayedInstallations();
2403 }
2404
2405 void ExtensionService::MaybeFinishDelayedInstallations() {
2406   std::vector<std::string> to_be_installed;
2407   for (ExtensionSet::const_iterator it = delayed_installs_.begin();
2408        it != delayed_installs_.end();
2409        ++it) {
2410     to_be_installed.push_back((*it)->id());
2411   }
2412   for (std::vector<std::string>::const_iterator it = to_be_installed.begin();
2413        it != to_be_installed.end();
2414        ++it) {
2415     MaybeFinishDelayedInstallation(*it);
2416   }
2417 }
2418
2419 void ExtensionService::OnBlacklistUpdated() {
2420   blacklist_->GetBlacklistedIDs(
2421       registry_->GenerateInstalledExtensionsSet()->GetIDs(),
2422       base::Bind(&ExtensionService::ManageBlacklist, AsWeakPtr()));
2423 }
2424
2425 void ExtensionService::ManageBlacklist(
2426     const extensions::Blacklist::BlacklistStateMap& state_map) {
2427   DCHECK_CURRENTLY_ON(BrowserThread::UI);
2428
2429   std::set<std::string> blacklisted;
2430   ExtensionIdSet greylist;
2431   ExtensionIdSet unchanged;
2432   for (extensions::Blacklist::BlacklistStateMap::const_iterator it =
2433            state_map.begin();
2434        it != state_map.end();
2435        ++it) {
2436     switch (it->second) {
2437       case extensions::NOT_BLACKLISTED:
2438         break;
2439
2440       case extensions::BLACKLISTED_MALWARE:
2441         blacklisted.insert(it->first);
2442         break;
2443
2444       case extensions::BLACKLISTED_SECURITY_VULNERABILITY:
2445       case extensions::BLACKLISTED_CWS_POLICY_VIOLATION:
2446       case extensions::BLACKLISTED_POTENTIALLY_UNWANTED:
2447         greylist.insert(it->first);
2448         break;
2449
2450       case extensions::BLACKLISTED_UNKNOWN:
2451         unchanged.insert(it->first);
2452         break;
2453     }
2454   }
2455
2456   UpdateBlacklistedExtensions(blacklisted, unchanged);
2457   UpdateGreylistedExtensions(greylist, unchanged, state_map);
2458
2459   error_controller_->ShowErrorIfNeeded();
2460 }
2461
2462 namespace {
2463 void Partition(const ExtensionIdSet& before,
2464                const ExtensionIdSet& after,
2465                const ExtensionIdSet& unchanged,
2466                ExtensionIdSet* no_longer,
2467                ExtensionIdSet* not_yet) {
2468   *not_yet   = base::STLSetDifference<ExtensionIdSet>(after, before);
2469   *no_longer = base::STLSetDifference<ExtensionIdSet>(before, after);
2470   *no_longer = base::STLSetDifference<ExtensionIdSet>(*no_longer, unchanged);
2471 }
2472 }  // namespace
2473
2474 void ExtensionService::UpdateBlacklistedExtensions(
2475     const ExtensionIdSet& blacklisted,
2476     const ExtensionIdSet& unchanged) {
2477   ExtensionIdSet not_yet_blocked, no_longer_blocked;
2478   Partition(registry_->blacklisted_extensions().GetIDs(), blacklisted,
2479             unchanged, &no_longer_blocked, &not_yet_blocked);
2480
2481   for (ExtensionIdSet::iterator it = no_longer_blocked.begin();
2482        it != no_longer_blocked.end(); ++it) {
2483     scoped_refptr<const Extension> extension =
2484         registry_->blacklisted_extensions().GetByID(*it);
2485     if (!extension.get()) {
2486       NOTREACHED() << "Extension " << *it << " no longer blacklisted, "
2487                    << "but it was never blacklisted.";
2488       continue;
2489     }
2490     registry_->RemoveBlacklisted(*it);
2491     extension_prefs_->SetExtensionBlacklisted(extension->id(), false);
2492     AddExtension(extension.get());
2493     UMA_HISTOGRAM_ENUMERATION("ExtensionBlacklist.UnblacklistInstalled",
2494                               extension->location(),
2495                               Manifest::NUM_LOCATIONS);
2496   }
2497
2498   for (ExtensionIdSet::iterator it = not_yet_blocked.begin();
2499        it != not_yet_blocked.end(); ++it) {
2500     scoped_refptr<const Extension> extension = GetInstalledExtension(*it);
2501     if (!extension.get()) {
2502       NOTREACHED() << "Extension " << *it << " needs to be "
2503                    << "blacklisted, but it's not installed.";
2504       continue;
2505     }
2506     registry_->AddBlacklisted(extension);
2507     extension_prefs_->SetExtensionBlacklistState(
2508         extension->id(), extensions::BLACKLISTED_MALWARE);
2509     UnloadExtension(*it, UnloadedExtensionInfo::REASON_BLACKLIST);
2510     UMA_HISTOGRAM_ENUMERATION("ExtensionBlacklist.BlacklistInstalled",
2511                               extension->location(), Manifest::NUM_LOCATIONS);
2512   }
2513 }
2514
2515 // TODO(oleg): UMA logging
2516 void ExtensionService::UpdateGreylistedExtensions(
2517     const ExtensionIdSet& greylist,
2518     const ExtensionIdSet& unchanged,
2519     const extensions::Blacklist::BlacklistStateMap& state_map) {
2520   ExtensionIdSet not_yet_greylisted, no_longer_greylisted;
2521   Partition(greylist_.GetIDs(),
2522             greylist, unchanged,
2523             &no_longer_greylisted, &not_yet_greylisted);
2524
2525   for (ExtensionIdSet::iterator it = no_longer_greylisted.begin();
2526        it != no_longer_greylisted.end(); ++it) {
2527     scoped_refptr<const Extension> extension = greylist_.GetByID(*it);
2528     if (!extension.get()) {
2529       NOTREACHED() << "Extension " << *it << " no longer greylisted, "
2530                    << "but it was not marked as greylisted.";
2531       continue;
2532     }
2533
2534     greylist_.Remove(*it);
2535     extension_prefs_->SetExtensionBlacklistState(extension->id(),
2536                                                  extensions::NOT_BLACKLISTED);
2537     if (extension_prefs_->GetDisableReasons(extension->id()) &
2538         extensions::Extension::DISABLE_GREYLIST)
2539       EnableExtension(*it);
2540   }
2541
2542   for (ExtensionIdSet::iterator it = not_yet_greylisted.begin();
2543        it != not_yet_greylisted.end(); ++it) {
2544     scoped_refptr<const Extension> extension = GetInstalledExtension(*it);
2545     if (!extension.get()) {
2546       NOTREACHED() << "Extension " << *it << " needs to be "
2547                    << "disabled, but it's not installed.";
2548       continue;
2549     }
2550     greylist_.Insert(extension);
2551     extension_prefs_->SetExtensionBlacklistState(extension->id(),
2552                                                  state_map.find(*it)->second);
2553     if (registry_->enabled_extensions().Contains(extension->id()))
2554       DisableExtension(*it, extensions::Extension::DISABLE_GREYLIST);
2555   }
2556 }
2557
2558 void ExtensionService::AddUpdateObserver(extensions::UpdateObserver* observer) {
2559   update_observers_.AddObserver(observer);
2560 }
2561
2562 void ExtensionService::RemoveUpdateObserver(
2563     extensions::UpdateObserver* observer) {
2564   update_observers_.RemoveObserver(observer);
2565 }
2566
2567 // Used only by test code.
2568 void ExtensionService::UnloadAllExtensionsInternal() {
2569   profile_->GetExtensionSpecialStoragePolicy()->RevokeRightsForAllExtensions();
2570
2571   registry_->ClearAll();
2572   system_->runtime_data()->ClearAll();
2573
2574   // TODO(erikkay) should there be a notification for this?  We can't use
2575   // EXTENSION_UNLOADED since that implies that the extension has been disabled
2576   // or uninstalled.
2577 }
2578
2579 void ExtensionService::OnProfileDestructionStarted() {
2580   ExtensionIdSet ids_to_unload = registry_->enabled_extensions().GetIDs();
2581   for (ExtensionIdSet::iterator it = ids_to_unload.begin();
2582        it != ids_to_unload.end();
2583        ++it) {
2584     UnloadExtension(*it, UnloadedExtensionInfo::REASON_PROFILE_SHUTDOWN);
2585   }
2586 }