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/event_router.h"
  69 #include "extensions/browser/extension_host.h"
  70 #include "extensions/browser/extension_prefs.h"
  71 #include "extensions/browser/extension_registry.h"
  72 #include "extensions/browser/extension_system.h"
  73 #include "extensions/browser/extensions_browser_client.h"
  74 #include "extensions/browser/install_flag.h"
  75 #include "extensions/browser/runtime_data.h"
  76 #include "extensions/browser/uninstall_reason.h"
  77 #include "extensions/browser/update_observer.h"
  78 #include "extensions/browser/updater/extension_cache.h"
  79 #include "extensions/browser/updater/extension_downloader.h"
  80 #include "extensions/common/extension_messages.h"
  81 #include "extensions/common/extension_urls.h"
  82 #include "extensions/common/feature_switch.h"
  83 #include "extensions/common/file_util.h"
  84 #include "extensions/common/manifest_constants.h"
  85 #include "extensions/common/manifest_handlers/background_info.h"
  86 #include "extensions/common/manifest_url_handlers.h"
  87 #include "extensions/common/one_shot_event.h"
  88 #include "extensions/common/permissions/api_permission.h"
  89 #include "extensions/common/permissions/permission_message_provider.h"
  90 #include "extensions/common/permissions/permissions_data.h"
  91
  92 #if defined(ENABLE_SUPERVISED_USERS)
  93 #include "chrome/browser/supervised_user/supervised_user_service.h"
  94 #include "chrome/browser/supervised_user/supervised_user_service_factory.h"
  95 #endif
  96
  97 #if defined(OS_CHROMEOS)
  98 #include "chrome/browser/chromeos/extensions/install_limiter.h"
  99 #include "storage/browser/fileapi/file_system_backend.h"
 100 #include "storage/browser/fileapi/file_system_context.h"
 101 #endif
 102
 103 using content::BrowserContext;
 104 using content::BrowserThread;
 105 using content::DevToolsAgentHost;
 106 using extensions::APIPermission;
 107 using extensions::CrxInstaller;
 108 using extensions::Extension;
 109 using extensions::ExtensionIdSet;
 110 using extensions::ExtensionInfo;
 111 using extensions::ExtensionRegistry;
 112 using extensions::ExtensionSet;
 113 using extensions::FeatureSwitch;
 114 using extensions::InstallVerifier;
 115 using extensions::ManagementPolicy;
 116 using extensions::Manifest;
 117 using extensions::PermissionID;
 118 using extensions::PermissionIDSet;
 119 using extensions::PermissionMessage;
 120 using extensions::PermissionMessageIDs;
 121 using extensions::PermissionSet;
 122 using extensions::SharedModuleInfo;
 123 using extensions::SharedModuleService;
 124 using extensions::UnloadedExtensionInfo;
 125
 126 namespace {
 127
 128 // Wait this many seconds after an extensions becomes idle before updating it.
 129 const int kUpdateIdleDelay = 5;
 130
 131 #if defined(ENABLE_SUPERVISED_USERS)
 132 // Callback for SupervisedUserService::AddExtensionUpdateRequest.
 133 void ExtensionUpdateRequestSent(const std::string& id, bool success) {
 134   LOG_IF(WARNING, !success) << "Failed sending update request for " << id;
 135 }
 136 #endif
 137
 138 }  // namespace
 139
 140 // ExtensionService.
 141
 142 void ExtensionService::CheckExternalUninstall(const std::string& id) {
 143   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 144
 145   // Check if the providers know about this extension.
 146   extensions::ProviderCollection::const_iterator i;
 147   for (i = external_extension_providers_.begin();
 148        i != external_extension_providers_.end(); ++i) {
 149     DCHECK(i->get()->IsReady());
 150     if (i->get()->HasExtension(id))
 151       return;  // Yup, known extension, don't uninstall.
 152   }
 153
 154   // We get the list of external extensions to check from preferences.
 155   // It is possible that an extension has preferences but is not loaded.
 156   // For example, an extension that requires experimental permissions
 157   // will not be loaded if the experimental command line flag is not used.
 158   // In this case, do not uninstall.
 159   if (!GetInstalledExtension(id)) {
 160     // We can't call UninstallExtension with an unloaded/invalid
 161     // extension ID.
 162     LOG(WARNING) << "Attempted uninstallation of unloaded/invalid extension "
 163                  << "with id: " << id;
 164     return;
 165   }
 166   UninstallExtension(id,
 167                      extensions::UNINSTALL_REASON_ORPHANED_EXTERNAL_EXTENSION,
 168                      base::Bind(&base::DoNothing),
 169                      NULL);
 170 }
 171
 172 void ExtensionService::SetFileTaskRunnerForTesting(
 173     const scoped_refptr<base::SequencedTaskRunner>& task_runner) {
 174   file_task_runner_ = task_runner;
 175 }
 176
 177 void ExtensionService::ClearProvidersForTesting() {
 178   external_extension_providers_.clear();
 179 }
 180
 181 void ExtensionService::AddProviderForTesting(
 182     extensions::ExternalProviderInterface* test_provider) {
 183   CHECK(test_provider);
 184   external_extension_providers_.push_back(
 185       linked_ptr<extensions::ExternalProviderInterface>(test_provider));
 186 }
 187
 188 void ExtensionService::BlacklistExtensionForTest(
 189     const std::string& extension_id) {
 190   ExtensionIdSet blacklisted;
 191   ExtensionIdSet unchanged;
 192   blacklisted.insert(extension_id);
 193   UpdateBlacklistedExtensions(blacklisted, unchanged);
 194 }
 195
 196 bool ExtensionService::OnExternalExtensionUpdateUrlFound(
 197     const std::string& id,
 198     const std::string& install_parameter,
 199     const GURL& update_url,
 200     Manifest::Location location,
 201     int creation_flags,
 202     bool mark_acknowledged) {
 203   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 204   CHECK(crx_file::id_util::IdIsValid(id));
 205
 206   if (Manifest::IsExternalLocation(location)) {
 207     // All extensions that are not user specific can be cached.
 208     extensions::ExtensionsBrowserClient::Get()->GetExtensionCache()
 209         ->AllowCaching(id);
 210   }
 211
 212   const Extension* extension = GetExtensionById(id, true);
 213   if (extension) {
 214     // Already installed. Skip this install if the current location has
 215     // higher priority than |location|.
 216     Manifest::Location current = extension->location();
 217     if (current == Manifest::GetHigherPriorityLocation(current, location))
 218       return false;
 219     // Otherwise, overwrite the current installation.
 220   }
 221
 222   // Add |id| to the set of pending extensions.  If it can not be added,
 223   // then there is already a pending record from a higher-priority install
 224   // source.  In this case, signal that this extension will not be
 225   // installed by returning false.
 226   if (!pending_extension_manager()->AddFromExternalUpdateUrl(
 227           id,
 228           install_parameter,
 229           update_url,
 230           location,
 231           creation_flags,
 232           mark_acknowledged)) {
 233     return false;
 234   }
 235
 236   update_once_all_providers_are_ready_ = true;
 237   return true;
 238 }
 239
 240 // static
 241 // This function is used to uninstall an extension via sync.  The LOG statements
 242 // within this function are used to inform the user if the uninstall cannot be
 243 // done.
 244 bool ExtensionService::UninstallExtensionHelper(
 245     ExtensionService* extensions_service,
 246     const std::string& extension_id,
 247     extensions::UninstallReason reason) {
 248   // We can't call UninstallExtension with an invalid extension ID.
 249   if (!extensions_service->GetInstalledExtension(extension_id)) {
 250     LOG(WARNING) << "Attempted uninstallation of non-existent extension with "
 251                  << "id: " << extension_id;
 252     return false;
 253   }
 254
 255   // The following call to UninstallExtension will not allow an uninstall of a
 256   // policy-controlled extension.
 257   base::string16 error;
 258   if (!extensions_service->UninstallExtension(
 259           extension_id, reason, base::Bind(&base::DoNothing), &error)) {
 260     LOG(WARNING) << "Cannot uninstall extension with id " << extension_id
 261                  << ": " << error;
 262     return false;
 263   }
 264
 265   return true;
 266 }
 267
 268 ExtensionService::ExtensionService(Profile* profile,
 269                                    const base::CommandLine* command_line,
 270                                    const base::FilePath& install_directory,
 271                                    extensions::ExtensionPrefs* extension_prefs,
 272                                    extensions::Blacklist* blacklist,
 273                                    bool autoupdate_enabled,
 274                                    bool extensions_enabled,
 275                                    extensions::OneShotEvent* ready)
 276     : extensions::Blacklist::Observer(blacklist),
 277       profile_(profile),
 278       system_(extensions::ExtensionSystem::Get(profile)),
 279       extension_prefs_(extension_prefs),
 280       blacklist_(blacklist),
 281       registry_(extensions::ExtensionRegistry::Get(profile)),
 282       pending_extension_manager_(profile),
 283       install_directory_(install_directory),
 284       extensions_enabled_(extensions_enabled),
 285       show_extensions_prompts_(true),
 286       install_updates_when_idle_(true),
 287       ready_(ready),
 288       update_once_all_providers_are_ready_(false),
 289       browser_terminating_(false),
 290       installs_delayed_for_gc_(false),
 291       is_first_run_(false),
 292       block_extensions_(false),
 293       shared_module_service_(new extensions::SharedModuleService(profile_)),
 294       app_data_migrator_(new extensions::AppDataMigrator(profile_, registry_)) {
 295   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 296   TRACE_EVENT0("browser,startup", "ExtensionService::ExtensionService::ctor");
 297
 298   // Figure out if extension installation should be enabled.
 299   if (extensions::ExtensionsBrowserClient::Get()->AreExtensionsDisabled(
 300           *command_line, profile))
 301     extensions_enabled_ = false;
 302
 303   registrar_.Add(this, chrome::NOTIFICATION_APP_TERMINATING,
 304                  content::NotificationService::AllBrowserContextsAndSources());
 305   registrar_.Add(this,
 306                  extensions::NOTIFICATION_EXTENSION_PROCESS_TERMINATED,
 307                  content::NotificationService::AllBrowserContextsAndSources());
 308   registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_TERMINATED,
 309                  content::NotificationService::AllBrowserContextsAndSources());
 310   registrar_.Add(this, chrome::NOTIFICATION_UPGRADE_RECOMMENDED,
 311                  content::NotificationService::AllBrowserContextsAndSources());
 312   registrar_.Add(this,
 313                  chrome::NOTIFICATION_PROFILE_DESTRUCTION_STARTED,
 314                  content::Source<Profile>(profile_));
 315
 316   extensions::ExtensionManagementFactory::GetForBrowserContext(profile_)
 317       ->AddObserver(this);
 318
 319   // Set up the ExtensionUpdater.
 320   if (autoupdate_enabled) {
 321     int update_frequency = extensions::kDefaultUpdateFrequencySeconds;
 322     if (command_line->HasSwitch(switches::kExtensionsUpdateFrequency)) {
 323       base::StringToInt(command_line->GetSwitchValueASCII(
 324           switches::kExtensionsUpdateFrequency),
 325           &update_frequency);
 326     }
 327     updater_.reset(new extensions::ExtensionUpdater(
 328         this,
 329         extension_prefs,
 330         profile->GetPrefs(),
 331         profile,
 332         update_frequency,
 333         extensions::ExtensionsBrowserClient::Get()->GetExtensionCache(),
 334         base::Bind(ChromeExtensionDownloaderFactory::CreateForProfile,
 335                    profile)));
 336   }
 337
 338   component_loader_.reset(
 339       new extensions::ComponentLoader(this,
 340                                       profile->GetPrefs(),
 341                                       g_browser_process->local_state(),
 342                                       profile));
 343
 344   if (extensions_enabled_) {
 345     extensions::ExternalProviderImpl::CreateExternalProviders(
 346         this, profile_, &external_extension_providers_);
 347   }
 348
 349   // Set this as the ExtensionService for app sorting to ensure it causes syncs
 350   // if required.
 351   is_first_run_ = !extension_prefs_->SetAlertSystemFirstRun();
 352
 353   error_controller_.reset(
 354       new extensions::ExtensionErrorController(profile_, is_first_run_));
 355   external_install_manager_.reset(
 356       new extensions::ExternalInstallManager(profile_, is_first_run_));
 357
 358   extension_action_storage_manager_.reset(
 359       new extensions::ExtensionActionStorageManager(profile_));
 360
 361   // How long is the path to the Extensions directory?
 362   UMA_HISTOGRAM_CUSTOM_COUNTS("Extensions.ExtensionRootPathLength",
 363                               install_directory_.value().length(), 0, 500, 100);
 364 }
 365
 366 extensions::PendingExtensionManager*
 367     ExtensionService::pending_extension_manager() {
 368   return &pending_extension_manager_;
 369 }
 370
 371 ExtensionService::~ExtensionService() {
 372   // No need to unload extensions here because they are profile-scoped, and the
 373   // profile is in the process of being deleted.
 374
 375   extensions::ProviderCollection::const_iterator i;
 376   for (i = external_extension_providers_.begin();
 377        i != external_extension_providers_.end(); ++i) {
 378     extensions::ExternalProviderInterface* provider = i->get();
 379     provider->ServiceShutdown();
 380   }
 381 }
 382
 383 void ExtensionService::Shutdown() {
 384   extensions::ExtensionManagementFactory::GetInstance()
 385       ->GetForBrowserContext(profile())
 386       ->RemoveObserver(this);
 387   system_->management_policy()->UnregisterProvider(
 388       shared_module_policy_provider_.get());
 389 }
 390
 391 const Extension* ExtensionService::GetExtensionById(
 392     const std::string& id, bool include_disabled) const {
 393   int include_mask = ExtensionRegistry::ENABLED;
 394   if (include_disabled) {
 395     // Include blacklisted and blocked extensions here because there are
 396     // hundreds of callers of this function, and many might assume that this
 397     // includes those that have been disabled due to blacklisting or blocking.
 398     include_mask |= ExtensionRegistry::DISABLED |
 399                     ExtensionRegistry::BLACKLISTED | ExtensionRegistry::BLOCKED;
 400   }
 401   return registry_->GetExtensionById(id, include_mask);
 402 }
 403
 404 void ExtensionService::Init() {
 405   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 406   TRACE_EVENT0("browser,startup", "ExtensionService::Init");
 407   TRACK_SCOPED_REGION("Startup", "ExtensionService::Init");
 408   SCOPED_UMA_HISTOGRAM_TIMER("Extensions.ExtensionServiceInitTime");
 409
 410   DCHECK(!is_ready());  // Can't redo init.
 411   DCHECK_EQ(registry_->enabled_extensions().size(), 0u);
 412
 413   const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
 414   if (cmd_line->HasSwitch(switches::kInstallEphemeralAppFromWebstore)) {
 415     // The sole purpose of this launch is to install a new extension from CWS
 416     // and immediately terminate: loading already installed extensions is
 417     // unnecessary and may interfere with the inline install dialog (e.g. if an
 418     // extension listens to onStartup and opens a window).
 419     SetReadyAndNotifyListeners();
 420   } else {
 421     // LoadAllExtensions() calls OnLoadedInstalledExtensions().
 422     component_loader_->LoadAll();
 423     extensions::InstalledLoader(this).LoadAllExtensions();
 424
 425     EnabledReloadableExtensions();
 426     MaybeFinishShutdownDelayed();
 427     SetReadyAndNotifyListeners();
 428
 429     // TODO(erikkay): this should probably be deferred to a future point
 430     // rather than running immediately at startup.
 431     CheckForExternalUpdates();
 432
 433     LoadGreylistFromPrefs();
 434   }
 435 }
 436
 437 void ExtensionService::EnabledReloadableExtensions() {
 438   TRACE_EVENT0("browser,startup",
 439                "ExtensionService::EnabledReloadableExtensions");
 440
 441   std::vector<std::string> extensions_to_enable;
 442   const ExtensionSet& disabled_extensions = registry_->disabled_extensions();
 443   for (ExtensionSet::const_iterator iter = disabled_extensions.begin();
 444        iter != disabled_extensions.end(); ++iter) {
 445     const Extension* e = iter->get();
 446     if (extension_prefs_->GetDisableReasons(e->id()) ==
 447         Extension::DISABLE_RELOAD) {
 448       extensions_to_enable.push_back(e->id());
 449     }
 450   }
 451   for (const std::string& extension : extensions_to_enable) {
 452     EnableExtension(extension);
 453   }
 454 }
 455
 456 void ExtensionService::MaybeFinishShutdownDelayed() {
 457   TRACE_EVENT0("browser,startup",
 458                "ExtensionService::MaybeFinishShutdownDelayed");
 459
 460   scoped_ptr<extensions::ExtensionPrefs::ExtensionsInfo> delayed_info(
 461       extension_prefs_->GetAllDelayedInstallInfo());
 462   for (size_t i = 0; i < delayed_info->size(); ++i) {
 463     ExtensionInfo* info = delayed_info->at(i).get();
 464     scoped_refptr<const Extension> extension(NULL);
 465     if (info->extension_manifest) {
 466       std::string error;
 467       extension = Extension::Create(
 468           info->extension_path, info->extension_location,
 469           *info->extension_manifest,
 470           extension_prefs_->GetDelayedInstallCreationFlags(info->extension_id),
 471           info->extension_id, &error);
 472       if (extension.get())
 473         delayed_installs_.Insert(extension);
 474     }
 475   }
 476   MaybeFinishDelayedInstallations();
 477   scoped_ptr<extensions::ExtensionPrefs::ExtensionsInfo> delayed_info2(
 478       extension_prefs_->GetAllDelayedInstallInfo());
 479   UMA_HISTOGRAM_COUNTS_100("Extensions.UpdateOnLoad",
 480                            delayed_info2->size() - delayed_info->size());
 481 }
 482
 483 void ExtensionService::LoadGreylistFromPrefs() {
 484   TRACE_EVENT0("browser,startup", "ExtensionService::LoadGreylistFromPrefs");
 485
 486   scoped_ptr<ExtensionSet> all_extensions =
 487       registry_->GenerateInstalledExtensionsSet();
 488
 489   for (ExtensionSet::const_iterator it = all_extensions->begin();
 490        it != all_extensions->end(); ++it) {
 491     extensions::BlacklistState state =
 492         extension_prefs_->GetExtensionBlacklistState((*it)->id());
 493     if (state == extensions::BLACKLISTED_SECURITY_VULNERABILITY ||
 494         state == extensions::BLACKLISTED_POTENTIALLY_UNWANTED ||
 495         state == extensions::BLACKLISTED_CWS_POLICY_VIOLATION)
 496       greylist_.Insert(*it);
 497   }
 498 }
 499
 500 bool ExtensionService::UpdateExtension(const extensions::CRXFileInfo& file,
 501                                        bool file_ownership_passed,
 502                                        CrxInstaller** out_crx_installer) {
 503   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 504   if (browser_terminating_) {
 505     LOG(WARNING) << "Skipping UpdateExtension due to browser shutdown";
 506     // Leak the temp file at extension_path. We don't want to add to the disk
 507     // I/O burden at shutdown, we can't rely on the I/O completing anyway, and
 508     // the file is in the OS temp directory which should be cleaned up for us.
 509     return false;
 510   }
 511
 512   const std::string& id = file.extension_id;
 513
 514   const extensions::PendingExtensionInfo* pending_extension_info =
 515       pending_extension_manager()->GetById(id);
 516
 517   const Extension* extension = GetInstalledExtension(id);
 518   if (!pending_extension_info && !extension) {
 519     LOG(WARNING) << "Will not update extension " << id
 520                  << " because it is not installed or pending";
 521     // Delete extension_path since we're not creating a CrxInstaller
 522     // that would do it for us.
 523     if (!GetFileTaskRunner()->PostTask(
 524             FROM_HERE,
 525             base::Bind(&extensions::file_util::DeleteFile, file.path, false)))
 526       NOTREACHED();
 527
 528     return false;
 529   }
 530
 531   scoped_refptr<CrxInstaller> installer(
 532       CrxInstaller::Create(this, scoped_ptr<ExtensionInstallPrompt>()));
 533   installer->set_expected_id(id);
 534   installer->set_expected_hash(file.expected_hash);
 535   int creation_flags = Extension::NO_FLAGS;
 536   if (pending_extension_info) {
 537     installer->set_install_source(pending_extension_info->install_source());
 538     installer->set_allow_silent_install(true);
 539     if (pending_extension_info->remote_install())
 540       installer->set_grant_permissions(false);
 541     creation_flags = pending_extension_info->creation_flags();
 542     if (pending_extension_info->mark_acknowledged())
 543       external_install_manager_->AcknowledgeExternalExtension(id);
 544
 545     // If the extension came in disabled due to a permission increase, then
 546     // don't grant it all the permissions. crbug.com/484214
 547     if (extensions::ExtensionPrefs::Get(profile_)->HasDisableReason(
 548             id, Extension::DISABLE_PERMISSIONS_INCREASE)) {
 549       installer->set_grant_permissions(false);
 550     }
 551   } else if (extension) {
 552     installer->set_install_source(extension->location());
 553   }
 554   // If the extension was installed from or has migrated to the webstore, or
 555   // its auto-update URL is from the webstore, treat it as a webstore install.
 556   // Note that we ignore some older extensions with blank auto-update URLs
 557   // because we are mostly concerned with restrictions on NaCl extensions,
 558   // which are newer.
 559   if ((extension && extension->from_webstore()) ||
 560       (extension && extensions::ManifestURL::UpdatesFromGallery(extension)) ||
 561       (!extension && extension_urls::IsWebstoreUpdateUrl(
 562            pending_extension_info->update_url()))) {
 563     creation_flags |= Extension::FROM_WEBSTORE;
 564   }
 565
 566   // Bookmark apps being updated is kind of a contradiction, but that's because
 567   // we mark the default apps as bookmark apps, and they're hosted in the web
 568   // store, thus they can get updated. See http://crbug.com/101605 for more
 569   // details.
 570   if (extension && extension->from_bookmark())
 571     creation_flags |= Extension::FROM_BOOKMARK;
 572
 573   if (extension && extension->was_installed_by_default())
 574     creation_flags |= Extension::WAS_INSTALLED_BY_DEFAULT;
 575
 576   if (extension && extension->was_installed_by_oem())
 577     creation_flags |= Extension::WAS_INSTALLED_BY_OEM;
 578
 579   if (extension && extension->was_installed_by_custodian())
 580     creation_flags |= Extension::WAS_INSTALLED_BY_CUSTODIAN;
 581
 582   if (extension) {
 583     installer->set_is_ephemeral(extension_prefs_->IsEphemeralApp(id));
 584     installer->set_do_not_sync(extension_prefs_->DoNotSync(id));
 585   }
 586
 587   installer->set_creation_flags(creation_flags);
 588
 589   installer->set_delete_source(file_ownership_passed);
 590   installer->set_install_cause(extension_misc::INSTALL_CAUSE_UPDATE);
 591   installer->InstallCrxFile(file);
 592
 593   if (out_crx_installer)
 594     *out_crx_installer = installer.get();
 595
 596   return true;
 597 }
 598
 599 void ExtensionService::ReloadExtensionImpl(
 600     // "transient" because the process of reloading may cause the reference
 601     // to become invalid. Instead, use |extension_id|, a copy.
 602     const std::string& transient_extension_id,
 603     bool be_noisy) {
 604   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 605
 606   // If the extension is already reloading, don't reload again.
 607   if (extension_prefs_->GetDisableReasons(transient_extension_id) &
 608       Extension::DISABLE_RELOAD) {
 609     return;
 610   }
 611
 612   // Ignore attempts to reload a blacklisted or blocked extension. Sometimes
 613   // this can happen in a convoluted reload sequence triggered by the
 614   // termination of a blacklisted or blocked extension and a naive attempt to
 615   // reload it. For an example see http://crbug.com/373842.
 616   if (registry_->blacklisted_extensions().Contains(transient_extension_id) ||
 617       registry_->blocked_extensions().Contains(transient_extension_id)) {
 618     return;
 619   }
 620
 621   base::FilePath path;
 622
 623   std::string extension_id = transient_extension_id;
 624   const Extension* transient_current_extension =
 625       GetExtensionById(extension_id, false);
 626
 627   // Disable the extension if it's loaded. It might not be loaded if it crashed.
 628   if (transient_current_extension) {
 629     // If the extension has an inspector open for its background page, detach
 630     // the inspector and hang onto a cookie for it, so that we can reattach
 631     // later.
 632     // TODO(yoz): this is not incognito-safe!
 633     extensions::ProcessManager* manager =
 634         extensions::ProcessManager::Get(profile_);
 635     extensions::ExtensionHost* host =
 636         manager->GetBackgroundHostForExtension(extension_id);
 637     if (host && DevToolsAgentHost::HasFor(host->host_contents())) {
 638       // Look for an open inspector for the background page.
 639       scoped_refptr<DevToolsAgentHost> agent_host =
 640           DevToolsAgentHost::GetOrCreateFor(host->host_contents());
 641       agent_host->DisconnectWebContents();
 642       orphaned_dev_tools_[extension_id] = agent_host;
 643     }
 644
 645     path = transient_current_extension->path();
 646     // BeingUpgraded is set back to false when the extension is added.
 647     system_->runtime_data()->SetBeingUpgraded(transient_current_extension->id(),
 648                                               true);
 649     DisableExtension(extension_id, Extension::DISABLE_RELOAD);
 650     reloading_extensions_.insert(extension_id);
 651   } else {
 652     std::map<std::string, base::FilePath>::const_iterator iter =
 653         unloaded_extension_paths_.find(extension_id);
 654     if (iter == unloaded_extension_paths_.end()) {
 655       return;
 656     }
 657     path = unloaded_extension_paths_[extension_id];
 658   }
 659
 660   transient_current_extension = NULL;
 661
 662   if (delayed_installs_.Contains(extension_id)) {
 663     FinishDelayedInstallation(extension_id);
 664     return;
 665   }
 666
 667   // If we're reloading a component extension, use the component extension
 668   // loader's reloader.
 669   if (component_loader_->Exists(extension_id)) {
 670     component_loader_->Reload(extension_id);
 671     return;
 672   }
 673
 674   // Check the installed extensions to see if what we're reloading was already
 675   // installed.
 676   scoped_ptr<ExtensionInfo> installed_extension(
 677       extension_prefs_->GetInstalledExtensionInfo(extension_id));
 678   if (installed_extension.get() &&
 679       installed_extension->extension_manifest.get()) {
 680     extensions::InstalledLoader(this).Load(*installed_extension, false);
 681   } else {
 682     // Otherwise, the extension is unpacked (location LOAD).
 683     // We should always be able to remember the extension's path. If it's not in
 684     // the map, someone failed to update |unloaded_extension_paths_|.
 685     CHECK(!path.empty());
 686     scoped_refptr<extensions::UnpackedInstaller> unpacked_installer =
 687         extensions::UnpackedInstaller::Create(this);
 688     unpacked_installer->set_be_noisy_on_failure(be_noisy);
 689     unpacked_installer->Load(path);
 690   }
 691 }
 692
 693 void ExtensionService::ReloadExtension(const std::string& extension_id) {
 694   ReloadExtensionImpl(extension_id, true); // be_noisy
 695 }
 696
 697 void ExtensionService::ReloadExtensionWithQuietFailure(
 698     const std::string& extension_id) {
 699   ReloadExtensionImpl(extension_id, false); // be_noisy
 700 }
 701
 702 bool ExtensionService::UninstallExtension(
 703     // "transient" because the process of uninstalling may cause the reference
 704     // to become invalid. Instead, use |extenson->id()|.
 705     const std::string& transient_extension_id,
 706     extensions::UninstallReason reason,
 707     const base::Closure& deletion_done_callback,
 708     base::string16* error) {
 709   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 710
 711   scoped_refptr<const Extension> extension =
 712       GetInstalledExtension(transient_extension_id);
 713
 714   // Callers should not send us nonexistent extensions.
 715   CHECK(extension.get());
 716
 717   ManagementPolicy* by_policy = system_->management_policy();
 718   // Policy change which triggers an uninstall will always set
 719   // |external_uninstall| to true so this is the only way to uninstall
 720   // managed extensions.
 721   // Shared modules being uninstalled will also set |external_uninstall| to true
 722   // so that we can guarantee users don't uninstall a shared module.
 723   // (crbug.com/273300)
 724   // TODO(rdevlin.cronin): This is probably not right. We should do something
 725   // else, like include an enum IS_INTERNAL_UNINSTALL or IS_USER_UNINSTALL so
 726   // we don't do this.
 727   bool external_uninstall =
 728       (reason == extensions::UNINSTALL_REASON_INTERNAL_MANAGEMENT) ||
 729       (reason == extensions::UNINSTALL_REASON_COMPONENT_REMOVED) ||
 730       (reason == extensions::UNINSTALL_REASON_REINSTALL) ||
 731       (reason == extensions::UNINSTALL_REASON_ORPHANED_EXTERNAL_EXTENSION) ||
 732       (reason == extensions::UNINSTALL_REASON_ORPHANED_SHARED_MODULE) ||
 733       (reason == extensions::UNINSTALL_REASON_SYNC &&
 734        extension->was_installed_by_custodian());
 735   if (!external_uninstall &&
 736       (!by_policy->UserMayModifySettings(extension.get(), error) ||
 737        by_policy->MustRemainInstalled(extension.get(), error))) {
 738     content::NotificationService::current()->Notify(
 739         extensions::NOTIFICATION_EXTENSION_UNINSTALL_NOT_ALLOWED,
 740         content::Source<Profile>(profile_),
 741         content::Details<const Extension>(extension.get()));
 742     return false;
 743   }
 744
 745   InstallVerifier::Get(GetBrowserContext())->Remove(extension->id());
 746
 747   UMA_HISTOGRAM_ENUMERATION("Extensions.UninstallType",
 748                             extension->GetType(), 100);
 749   RecordPermissionMessagesHistogram(extension.get(), "Uninstall");
 750
 751   // Unload before doing more cleanup to ensure that nothing is hanging on to
 752   // any of these resources.
 753   UnloadExtension(extension->id(), UnloadedExtensionInfo::REASON_UNINSTALL);
 754
 755   // Tell the backend to start deleting installed extensions on the file thread.
 756   if (!Manifest::IsUnpackedLocation(extension->location())) {
 757     if (!GetFileTaskRunner()->PostTask(
 758             FROM_HERE,
 759             base::Bind(&ExtensionService::UninstallExtensionOnFileThread,
 760                        extension->id(),
 761                        profile_,
 762                        install_directory_,
 763                        extension->path())))
 764       NOTREACHED();
 765   }
 766
 767   extensions::DataDeleter::StartDeleting(
 768       profile_, extension.get(), deletion_done_callback);
 769
 770   UntrackTerminatedExtension(extension->id());
 771
 772   // Notify interested parties that we've uninstalled this extension.
 773   ExtensionRegistry::Get(profile_)
 774       ->TriggerOnUninstalled(extension.get(), reason);
 775
 776   // Don't sync the uninstall if we're going to reinstall the extension
 777   // momentarily.
 778   if (reason != extensions::UNINSTALL_REASON_REINSTALL) {
 779     ExtensionSyncService::Get(profile_)->SyncUninstallExtension(*extension);
 780   }
 781
 782   delayed_installs_.Remove(extension->id());
 783
 784   extension_prefs_->OnExtensionUninstalled(
 785       extension->id(), extension->location(), external_uninstall);
 786
 787   // Track the uninstallation.
 788   UMA_HISTOGRAM_ENUMERATION("Extensions.ExtensionUninstalled", 1, 2);
 789
 790   return true;
 791 }
 792
 793 // static
 794 void ExtensionService::UninstallExtensionOnFileThread(
 795     const std::string& id,
 796     Profile* profile,
 797     const base::FilePath& install_dir,
 798     const base::FilePath& extension_path) {
 799   extensions::ExtensionAssetsManager* assets_manager =
 800       extensions::ExtensionAssetsManager::GetInstance();
 801   assets_manager->UninstallExtension(id, profile, install_dir, extension_path);
 802 }
 803
 804 bool ExtensionService::IsExtensionEnabled(
 805     const std::string& extension_id) const {
 806   if (registry_->enabled_extensions().Contains(extension_id) ||
 807       registry_->terminated_extensions().Contains(extension_id)) {
 808     return true;
 809   }
 810
 811   if (registry_->disabled_extensions().Contains(extension_id) ||
 812       registry_->blacklisted_extensions().Contains(extension_id) ||
 813       registry_->blocked_extensions().Contains(extension_id)) {
 814     return false;
 815   }
 816
 817   // Blocked extensions aren't marked as such in prefs, thus if
 818   // |block_extensions_| is true then CanBlockExtension() must be called with an
 819   // Extension object. If the |extension_id| is not loaded, assume not enabled.
 820   if (block_extensions_) {
 821     const Extension* extension = GetInstalledExtension(extension_id);
 822     if (!extension || CanBlockExtension(extension))
 823       return false;
 824   }
 825
 826   // If the extension hasn't been loaded yet, check the prefs for it. Assume
 827   // enabled unless otherwise noted.
 828   return !extension_prefs_->IsExtensionDisabled(extension_id) &&
 829          !extension_prefs_->IsExtensionBlacklisted(extension_id) &&
 830          !extension_prefs_->IsExternalExtensionUninstalled(extension_id);
 831 }
 832
 833 void ExtensionService::EnableExtension(const std::string& extension_id) {
 834   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 835
 836   if (IsExtensionEnabled(extension_id))
 837     return;
 838   const Extension* extension =
 839       registry_->disabled_extensions().GetByID(extension_id);
 840
 841   ManagementPolicy* policy = system_->management_policy();
 842   if (extension && policy->MustRemainDisabled(extension, NULL, NULL)) {
 843     UMA_HISTOGRAM_COUNTS_100("Extensions.EnableDeniedByPolicy", 1);
 844     return;
 845   }
 846
 847   extension_prefs_->SetExtensionState(extension_id, Extension::ENABLED);
 848   extension_prefs_->ClearDisableReasons(extension_id);
 849
 850   // This can happen if sync enables an extension that is not
 851   // installed yet.
 852   if (!extension)
 853     return;
 854
 855   // Move it over to the enabled list.
 856   registry_->AddEnabled(make_scoped_refptr(extension));
 857   registry_->RemoveDisabled(extension->id());
 858
 859   NotifyExtensionLoaded(extension);
 860
 861   // Notify listeners that the extension was enabled.
 862   content::NotificationService::current()->Notify(
 863       extensions::NOTIFICATION_EXTENSION_ENABLED,
 864       content::Source<Profile>(profile_),
 865       content::Details<const Extension>(extension));
 866
 867   ExtensionSyncService::Get(profile_)->SyncExtensionChangeIfNeeded(*extension);
 868 }
 869
 870 void ExtensionService::DisableExtension(const std::string& extension_id,
 871                                         int disable_reasons) {
 872   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 873
 874   // The extension may have been disabled already. Just add a disable reason.
 875   if (!IsExtensionEnabled(extension_id)) {
 876     extension_prefs_->AddDisableReasons(extension_id, disable_reasons);
 877     return;
 878   }
 879
 880   const Extension* extension = GetInstalledExtension(extension_id);
 881   // |extension| can be NULL if sync disables an extension that is not
 882   // installed yet.
 883   // EXTERNAL_COMPONENT extensions are not generally modifiable by users, but
 884   // can be uninstalled by the browser if the user sets extension-specific
 885   // preferences.
 886   if (extension &&
 887       !(disable_reasons & Extension::DISABLE_RELOAD) &&
 888       !(disable_reasons & Extension::DISABLE_UPDATE_REQUIRED_BY_POLICY) &&
 889       !system_->management_policy()->UserMayModifySettings(extension, NULL) &&
 890       extension->location() != Manifest::EXTERNAL_COMPONENT) {
 891     return;
 892   }
 893
 894   extension_prefs_->SetExtensionState(extension_id, Extension::DISABLED);
 895   extension_prefs_->AddDisableReasons(extension_id, disable_reasons);
 896
 897   int include_mask =
 898       ExtensionRegistry::EVERYTHING & ~ExtensionRegistry::DISABLED;
 899   extension = registry_->GetExtensionById(extension_id, include_mask);
 900   if (!extension)
 901     return;
 902
 903   // The extension is either enabled or terminated.
 904   DCHECK(registry_->enabled_extensions().Contains(extension->id()) ||
 905          registry_->terminated_extensions().Contains(extension->id()));
 906
 907   // Move it over to the disabled list. Don't send a second unload notification
 908   // for terminated extensions being disabled.
 909   registry_->AddDisabled(make_scoped_refptr(extension));
 910   if (registry_->enabled_extensions().Contains(extension->id())) {
 911     registry_->RemoveEnabled(extension->id());
 912     NotifyExtensionUnloaded(extension, UnloadedExtensionInfo::REASON_DISABLE);
 913   } else {
 914     registry_->RemoveTerminated(extension->id());
 915   }
 916
 917   ExtensionSyncService::Get(profile_)->SyncExtensionChangeIfNeeded(*extension);
 918 }
 919
 920 void ExtensionService::DisableUserExtensions(
 921     const std::vector<std::string>& except_ids) {
 922   extensions::ManagementPolicy* management_policy =
 923       system_->management_policy();
 924   extensions::ExtensionList to_disable;
 925
 926   const ExtensionSet& enabled_set = registry_->enabled_extensions();
 927   for (ExtensionSet::const_iterator extension = enabled_set.begin();
 928       extension != enabled_set.end(); ++extension) {
 929     if (management_policy->UserMayModifySettings(extension->get(), NULL))
 930       to_disable.push_back(*extension);
 931   }
 932   const ExtensionSet& terminated_set = registry_->terminated_extensions();
 933   for (ExtensionSet::const_iterator extension = terminated_set.begin();
 934       extension != terminated_set.end(); ++extension) {
 935     if (management_policy->UserMayModifySettings(extension->get(), NULL))
 936       to_disable.push_back(*extension);
 937   }
 938
 939   for (extensions::ExtensionList::const_iterator extension = to_disable.begin();
 940       extension != to_disable.end(); ++extension) {
 941     if ((*extension)->was_installed_by_default() &&
 942         extension_urls::IsWebstoreUpdateUrl(
 943             extensions::ManifestURL::GetUpdateURL(extension->get())))
 944       continue;
 945     const std::string& id = (*extension)->id();
 946     if (except_ids.end() == std::find(except_ids.begin(), except_ids.end(), id))
 947       DisableExtension(id, extensions::Extension::DISABLE_USER_ACTION);
 948   }
 949 }
 950
 951 // Extensions that are not locked, components or forced by policy should be
 952 // locked. Extensions are no longer considered enabled or disabled. Blacklisted
 953 // extensions are now considered both blacklisted and locked.
 954 void ExtensionService::BlockAllExtensions() {
 955   if (block_extensions_)
 956     return;
 957   block_extensions_ = true;
 958
 959   // Blacklisted extensions are already unloaded, need not be blocked.
 960   scoped_ptr<ExtensionSet> extensions =
 961       registry_->GenerateInstalledExtensionsSet(ExtensionRegistry::ENABLED |
 962                                                 ExtensionRegistry::DISABLED |
 963                                                 ExtensionRegistry::TERMINATED);
 964
 965   for (const scoped_refptr<const Extension>& extension : *extensions) {
 966     const std::string& id = extension->id();
 967
 968     if (!CanBlockExtension(extension.get()))
 969       continue;
 970
 971     registry_->RemoveEnabled(id);
 972     registry_->RemoveDisabled(id);
 973     registry_->RemoveTerminated(id);
 974
 975     registry_->AddBlocked(extension.get());
 976     UnloadExtension(id, extensions::UnloadedExtensionInfo::REASON_LOCK_ALL);
 977   }
 978 }
 979
 980 // All locked extensions should revert to being either enabled or disabled
 981 // as appropriate.
 982 void ExtensionService::UnblockAllExtensions() {
 983   block_extensions_ = false;
 984   scoped_ptr<ExtensionSet> to_unblock =
 985       registry_->GenerateInstalledExtensionsSet(ExtensionRegistry::BLOCKED);
 986
 987   for (const scoped_refptr<const Extension>& extension : *to_unblock) {
 988     registry_->RemoveBlocked(extension->id());
 989     AddExtension(extension.get());
 990   }
 991 }
 992
 993 void ExtensionService::GrantPermissionsAndEnableExtension(
 994     const Extension* extension) {
 995   GrantPermissions(extension);
 996   RecordPermissionMessagesHistogram(extension, "ReEnable");
 997   EnableExtension(extension->id());
 998 }
 999
1000 void ExtensionService::GrantPermissions(const Extension* extension) {
1001   CHECK(extension);
1002   extensions::PermissionsUpdater(profile()).GrantActivePermissions(extension);
1003 }
1004
1005 // static
1006 void ExtensionService::RecordPermissionMessagesHistogram(
1007     const Extension* extension, const char* histogram) {
1008   // Since this is called from multiple sources, and since the histogram macros
1009   // use statics, we need to manually lookup the histogram ourselves.
1010   base::HistogramBase* counter = base::LinearHistogram::FactoryGet(
1011       base::StringPrintf("Extensions.Permissions_%s3", histogram),
1012       1,
1013       APIPermission::kEnumBoundary,
1014       APIPermission::kEnumBoundary + 1,
1015       base::HistogramBase::kUmaTargetedHistogramFlag);
1016
1017   base::HistogramBase* counter_has_any = base::BooleanHistogram::FactoryGet(
1018       base::StringPrintf("Extensions.HasPermissions_%s3", histogram),
1019       base::HistogramBase::kUmaTargetedHistogramFlag);
1020
1021   PermissionIDSet permissions =
1022       extensions::PermissionMessageProvider::Get()->GetAllPermissionIDs(
1023           extension->permissions_data()->active_permissions().get(),
1024           extension->GetType());
1025   counter_has_any->AddBoolean(!permissions.empty());
1026   for (const PermissionID& id : permissions)
1027     counter->Add(id.id());
1028 }
1029
1030 void ExtensionService::NotifyExtensionLoaded(const Extension* extension) {
1031   // The URLRequestContexts need to be first to know that the extension
1032   // was loaded, otherwise a race can arise where a renderer that is created
1033   // for the extension may try to load an extension URL with an extension id
1034   // that the request context doesn't yet know about. The profile is responsible
1035   // for ensuring its URLRequestContexts appropriately discover the loaded
1036   // extension.
1037   system_->RegisterExtensionWithRequestContexts(extension);
1038
1039   // Tell renderers about the new extension, unless it's a theme (renderers
1040   // don't need to know about themes).
1041   if (!extension->is_theme()) {
1042     for (content::RenderProcessHost::iterator i(
1043             content::RenderProcessHost::AllHostsIterator());
1044          !i.IsAtEnd(); i.Advance()) {
1045       content::RenderProcessHost* host = i.GetCurrentValue();
1046       Profile* host_profile =
1047           Profile::FromBrowserContext(host->GetBrowserContext());
1048       if (host_profile->GetOriginalProfile() ==
1049           profile_->GetOriginalProfile()) {
1050         // We don't need to include tab permisisons here, since the extension
1051         // was just loaded.
1052         std::vector<ExtensionMsg_Loaded_Params> loaded_extensions(
1053             1, ExtensionMsg_Loaded_Params(extension,
1054                                           false /* no tab permissions */));
1055         host->Send(
1056             new ExtensionMsg_Loaded(loaded_extensions));
1057       }
1058     }
1059   }
1060
1061   // Tell subsystems that use the EXTENSION_LOADED notification about the new
1062   // extension.
1063   //
1064   // NOTE: It is important that this happen after notifying the renderers about
1065   // the new extensions so that if we navigate to an extension URL in
1066   // ExtensionRegistryObserver::OnLoaded or
1067   // NOTIFICATION_EXTENSION_LOADED_DEPRECATED, the
1068   // renderer is guaranteed to know about it.
1069   registry_->TriggerOnLoaded(extension);
1070
1071   content::NotificationService::current()->Notify(
1072       extensions::NOTIFICATION_EXTENSION_LOADED_DEPRECATED,
1073       content::Source<Profile>(profile_),
1074       content::Details<const Extension>(extension));
1075
1076   // TODO(kalman): Convert ExtensionSpecialStoragePolicy to a
1077   // BrowserContextKeyedService and use ExtensionRegistryObserver.
1078   profile_->GetExtensionSpecialStoragePolicy()->
1079       GrantRightsForExtension(extension, profile_);
1080
1081   // TODO(kalman): This is broken. The crash reporter is process-wide so doesn't
1082   // work properly multi-profile. Besides which, it should be using
1083   // ExtensionRegistryObserver. See http://crbug.com/355029.
1084   UpdateActiveExtensionsInCrashReporter();
1085
1086   const extensions::PermissionsData* permissions_data =
1087       extension->permissions_data();
1088
1089   // If the extension has permission to load chrome://favicon/ resources we need
1090   // to make sure that the FaviconSource is registered with the
1091   // ChromeURLDataManager.
1092   if (permissions_data->HasHostPermission(GURL(chrome::kChromeUIFaviconURL))) {
1093     FaviconSource* favicon_source = new FaviconSource(profile_,
1094                                                       FaviconSource::FAVICON);
1095     content::URLDataSource::Add(profile_, favicon_source);
1096   }
1097
1098   // Same for chrome://theme/ resources.
1099   if (permissions_data->HasHostPermission(GURL(chrome::kChromeUIThemeURL))) {
1100     ThemeSource* theme_source = new ThemeSource(profile_);
1101     content::URLDataSource::Add(profile_, theme_source);
1102   }
1103
1104   // Same for chrome://thumb/ resources.
1105   if (permissions_data->HasHostPermission(
1106           GURL(chrome::kChromeUIThumbnailURL))) {
1107     ThumbnailSource* thumbnail_source = new ThumbnailSource(profile_, false);
1108     content::URLDataSource::Add(profile_, thumbnail_source);
1109   }
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, since the
1671     // supervised user themselves can't re-enable the extension.
1672     if (extensions::util::IsExtensionSupervised(extension, profile_)) {
1673       SupervisedUserService* supervised_user_service =
1674           SupervisedUserServiceFactory::GetForProfile(profile_);
1675       supervised_user_service->AddExtensionUpdateRequest(
1676           extension->id(), *extension->version(),
1677           base::Bind(ExtensionUpdateRequestSent, extension->id()));
1678     }
1679 #endif
1680   }
1681   if (disable_reasons != Extension::DISABLE_NONE)
1682     extension_prefs_->AddDisableReasons(extension->id(), disable_reasons);
1683 }
1684
1685 void ExtensionService::UpdateActiveExtensionsInCrashReporter() {
1686   std::set<std::string> extension_ids;
1687   const ExtensionSet& extensions = registry_->enabled_extensions();
1688   for (ExtensionSet::const_iterator iter = extensions.begin();
1689        iter != extensions.end(); ++iter) {
1690     const Extension* extension = iter->get();
1691     if (!extension->is_theme() && extension->location() != Manifest::COMPONENT)
1692       extension_ids.insert(extension->id());
1693   }
1694
1695   // TODO(kalman): This is broken. ExtensionService is per-profile.
1696   // crash_keys::SetActiveExtensions is per-process. See
1697   // http://crbug.com/355029.
1698   crash_keys::SetActiveExtensions(extension_ids);
1699 }
1700
1701 void ExtensionService::OnExtensionInstalled(
1702     const Extension* extension,
1703     const syncer::StringOrdinal& page_ordinal,
1704     int install_flags) {
1705   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
1706
1707   const std::string& id = extension->id();
1708   int disable_reasons = GetDisableReasonsOnInstalled(extension);
1709   std::string install_parameter;
1710   const extensions::PendingExtensionInfo* pending_extension_info =
1711       pending_extension_manager()->GetById(id);
1712   if (pending_extension_info) {
1713     if (!pending_extension_info->ShouldAllowInstall(extension)) {
1714       pending_extension_manager()->Remove(id);
1715
1716       LOG(WARNING) << "ShouldAllowInstall() returned false for "
1717                    << id << " of type " << extension->GetType()
1718                    << " and update URL "
1719                    << extensions::ManifestURL::GetUpdateURL(extension).spec()
1720                    << "; not installing";
1721
1722       // Delete the extension directory since we're not going to
1723       // load it.
1724       if (!GetFileTaskRunner()->PostTask(
1725               FROM_HERE,
1726               base::Bind(&extensions::file_util::DeleteFile,
1727                          extension->path(),
1728                          true))) {
1729         NOTREACHED();
1730       }
1731       return;
1732     }
1733
1734     install_parameter = pending_extension_info->install_parameter();
1735     pending_extension_manager()->Remove(id);
1736   } else {
1737     // We explicitly want to re-enable an uninstalled external
1738     // extension; if we're here, that means the user is manually
1739     // installing the extension.
1740     if (extension_prefs_->IsExternalExtensionUninstalled(id)) {
1741       disable_reasons = Extension::DISABLE_NONE;
1742     }
1743   }
1744
1745   // Unsupported requirements overrides the management policy.
1746   if (install_flags & extensions::kInstallFlagHasRequirementErrors) {
1747     disable_reasons |= Extension::DISABLE_UNSUPPORTED_REQUIREMENT;
1748   } else {
1749     // Requirement is supported now, remove the corresponding disable reason
1750     // instead.
1751     extension_prefs_->RemoveDisableReason(
1752         id, Extension::DISABLE_UNSUPPORTED_REQUIREMENT);
1753     disable_reasons &= ~Extension::DISABLE_UNSUPPORTED_REQUIREMENT;
1754   }
1755
1756   // Check if the extension was disabled because of the minimum version
1757   // requirements from enterprise policy, and satisfies it now.
1758   if (extensions::ExtensionManagementFactory::GetForBrowserContext(profile())
1759           ->CheckMinimumVersion(extension, nullptr)) {
1760     // And remove the corresponding disable reason.
1761     extension_prefs_->RemoveDisableReason(
1762         id, Extension::DISABLE_UPDATE_REQUIRED_BY_POLICY);
1763     disable_reasons &= ~Extension::DISABLE_UPDATE_REQUIRED_BY_POLICY;
1764   }
1765
1766   if (install_flags & extensions::kInstallFlagIsBlacklistedForMalware) {
1767     // Installation of a blacklisted extension can happen from sync, policy,
1768     // etc, where to maintain consistency we need to install it, just never
1769     // load it (see AddExtension). Usually it should be the job of callers to
1770     // intercept blacklisted extensions earlier (e.g. CrxInstaller, before even
1771     // showing the install dialogue).
1772     extension_prefs_->AcknowledgeBlacklistedExtension(id);
1773     UMA_HISTOGRAM_ENUMERATION("ExtensionBlacklist.SilentInstall",
1774                               extension->location(),
1775                               Manifest::NUM_LOCATIONS);
1776   }
1777
1778   if (!GetInstalledExtension(extension->id())) {
1779     UMA_HISTOGRAM_ENUMERATION("Extensions.InstallType",
1780                               extension->GetType(), 100);
1781     UMA_HISTOGRAM_ENUMERATION("Extensions.InstallSource",
1782                               extension->location(), Manifest::NUM_LOCATIONS);
1783     RecordPermissionMessagesHistogram(extension, "Install");
1784   } else {
1785     UMA_HISTOGRAM_ENUMERATION("Extensions.UpdateType",
1786                               extension->GetType(), 100);
1787     UMA_HISTOGRAM_ENUMERATION("Extensions.UpdateSource",
1788                               extension->location(), Manifest::NUM_LOCATIONS);
1789
1790     // A fully installed app cannot be demoted to an ephemeral app.
1791     if ((install_flags & extensions::kInstallFlagIsEphemeral) &&
1792         !extension_prefs_->IsEphemeralApp(id)) {
1793       install_flags &= ~static_cast<int>(extensions::kInstallFlagIsEphemeral);
1794     }
1795   }
1796
1797   if (disable_reasons)
1798     extension_prefs_->AddDisableReasons(id, disable_reasons);
1799
1800   const Extension::State initial_state =
1801       disable_reasons == Extension::DISABLE_NONE ? Extension::ENABLED
1802                                                  : Extension::DISABLED;
1803
1804   if (ShouldDelayExtensionUpdate(
1805           id,
1806           !!(install_flags & extensions::kInstallFlagInstallImmediately))) {
1807     extension_prefs_->SetDelayedInstallInfo(
1808         extension,
1809         initial_state,
1810         install_flags,
1811         extensions::ExtensionPrefs::DELAY_REASON_WAIT_FOR_IDLE,
1812         page_ordinal,
1813         install_parameter);
1814
1815     // Transfer ownership of |extension|.
1816     delayed_installs_.Insert(extension);
1817
1818     // Notify observers that app update is available.
1819     FOR_EACH_OBSERVER(extensions::UpdateObserver, update_observers_,
1820                       OnAppUpdateAvailable(extension));
1821     return;
1822   }
1823
1824   extensions::SharedModuleService::ImportStatus status =
1825       shared_module_service_->SatisfyImports(extension);
1826   if (installs_delayed_for_gc_) {
1827     extension_prefs_->SetDelayedInstallInfo(
1828         extension,
1829         initial_state,
1830         install_flags,
1831         extensions::ExtensionPrefs::DELAY_REASON_GC,
1832         page_ordinal,
1833         install_parameter);
1834     delayed_installs_.Insert(extension);
1835   } else if (status != SharedModuleService::IMPORT_STATUS_OK) {
1836     if (status == SharedModuleService::IMPORT_STATUS_UNSATISFIED) {
1837       extension_prefs_->SetDelayedInstallInfo(
1838           extension,
1839           initial_state,
1840           install_flags,
1841           extensions::ExtensionPrefs::DELAY_REASON_WAIT_FOR_IMPORTS,
1842           page_ordinal,
1843           install_parameter);
1844       delayed_installs_.Insert(extension);
1845     }
1846   } else {
1847     AddNewOrUpdatedExtension(extension,
1848                              initial_state,
1849                              install_flags,
1850                              page_ordinal,
1851                              install_parameter);
1852   }
1853 }
1854
1855 void ExtensionService::OnExtensionManagementSettingsChanged() {
1856   error_controller_->ShowErrorIfNeeded();
1857
1858   // Revokes blocked permissions from active_permissions for all extensions.
1859   extensions::ExtensionManagement* settings =
1860       extensions::ExtensionManagementFactory::GetForBrowserContext(profile());
1861   CHECK(settings);
1862   scoped_ptr<ExtensionSet> all_extensions(
1863       registry_->GenerateInstalledExtensionsSet());
1864   for (const auto& extension : *all_extensions.get()) {
1865     if (!settings->IsPermissionSetAllowed(
1866             extension.get(),
1867             extension->permissions_data()->active_permissions())) {
1868       extensions::PermissionsUpdater(profile()).RemovePermissions(
1869           extension.get(),
1870           settings->GetBlockedPermissions(extension.get()).get());
1871     }
1872   }
1873
1874   CheckManagementPolicy();
1875 }
1876
1877 void ExtensionService::AddNewOrUpdatedExtension(
1878     const Extension* extension,
1879     Extension::State initial_state,
1880     int install_flags,
1881     const syncer::StringOrdinal& page_ordinal,
1882     const std::string& install_parameter) {
1883   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
1884   bool was_ephemeral = extension_prefs_->IsEphemeralApp(extension->id());
1885   extension_prefs_->OnExtensionInstalled(
1886       extension, initial_state, page_ordinal, install_flags, install_parameter);
1887   delayed_installs_.Remove(extension->id());
1888   if (InstallVerifier::NeedsVerification(*extension))
1889     InstallVerifier::Get(GetBrowserContext())->VerifyExtension(extension->id());
1890
1891   const Extension* old = GetInstalledExtension(extension->id());
1892   if (extensions::AppDataMigrator::NeedsMigration(old, extension)) {
1893     app_data_migrator_->DoMigrationAndReply(
1894         old, extension,
1895         base::Bind(&ExtensionService::FinishInstallation, AsWeakPtr(),
1896                    make_scoped_refptr(extension), was_ephemeral));
1897     return;
1898   }
1899
1900   FinishInstallation(extension, was_ephemeral);
1901 }
1902
1903 void ExtensionService::MaybeFinishDelayedInstallation(
1904     const std::string& extension_id) {
1905   // Check if the extension already got installed.
1906   if (!delayed_installs_.Contains(extension_id))
1907     return;
1908   extensions::ExtensionPrefs::DelayReason reason =
1909       extension_prefs_->GetDelayedInstallReason(extension_id);
1910
1911   // Check if the extension is idle. DELAY_REASON_NONE is used for older
1912   // preferences files that will not have set this field but it was previously
1913   // only used for idle updates.
1914   if ((reason == extensions::ExtensionPrefs::DELAY_REASON_WAIT_FOR_IDLE ||
1915        reason == extensions::ExtensionPrefs::DELAY_REASON_NONE) &&
1916        is_ready() && !extensions::util::IsExtensionIdle(extension_id, profile_))
1917     return;
1918
1919   const Extension* extension = delayed_installs_.GetByID(extension_id);
1920   if (reason == extensions::ExtensionPrefs::DELAY_REASON_WAIT_FOR_IMPORTS) {
1921     extensions::SharedModuleService::ImportStatus status =
1922         shared_module_service_->SatisfyImports(extension);
1923     if (status != SharedModuleService::IMPORT_STATUS_OK) {
1924       if (status == SharedModuleService::IMPORT_STATUS_UNRECOVERABLE) {
1925         delayed_installs_.Remove(extension_id);
1926         // Make sure no version of the extension is actually installed, (i.e.,
1927         // that this delayed install was not an update).
1928         CHECK(!extension_prefs_->GetInstalledExtensionInfo(extension_id).get());
1929         extension_prefs_->DeleteExtensionPrefs(extension_id);
1930       }
1931       return;
1932     }
1933   }
1934
1935   FinishDelayedInstallation(extension_id);
1936 }
1937
1938 void ExtensionService::FinishDelayedInstallation(
1939     const std::string& extension_id) {
1940   scoped_refptr<const Extension> extension(
1941       GetPendingExtensionUpdate(extension_id));
1942   CHECK(extension.get());
1943   delayed_installs_.Remove(extension_id);
1944
1945   bool was_ephemeral = extension_prefs_->IsEphemeralApp(extension->id());
1946   if (!extension_prefs_->FinishDelayedInstallInfo(extension_id))
1947     NOTREACHED();
1948
1949   FinishInstallation(extension.get(), was_ephemeral);
1950 }
1951
1952 void ExtensionService::FinishInstallation(
1953     const Extension* extension, bool was_ephemeral) {
1954   const extensions::Extension* existing_extension =
1955       GetInstalledExtension(extension->id());
1956   bool is_update = false;
1957   std::string old_name;
1958   if (existing_extension) {
1959     is_update = true;
1960     old_name = existing_extension->name();
1961   }
1962   bool from_ephemeral =
1963       was_ephemeral && !extension_prefs_->IsEphemeralApp(extension->id());
1964   extensions::InstalledExtensionInfo details(
1965       extension, is_update, from_ephemeral, old_name);
1966   content::NotificationService::current()->Notify(
1967       extensions::NOTIFICATION_EXTENSION_WILL_BE_INSTALLED_DEPRECATED,
1968       content::Source<Profile>(profile_),
1969       content::Details<const extensions::InstalledExtensionInfo>(&details));
1970
1971   registry_->TriggerOnWillBeInstalled(
1972       extension, is_update, from_ephemeral, old_name);
1973
1974   // Unpacked extensions default to allowing file access, but if that has been
1975   // overridden, don't reset the value.
1976   if (Manifest::ShouldAlwaysAllowFileAccess(extension->location()) &&
1977       !extension_prefs_->HasAllowFileAccessSetting(extension->id())) {
1978     extension_prefs_->SetAllowFileAccess(extension->id(), true);
1979   }
1980
1981   AddExtension(extension);
1982
1983   // Notify observers that need to know when an installation is complete.
1984   registry_->TriggerOnInstalled(extension, is_update);
1985
1986   // Check extensions that may have been delayed only because this shared module
1987   // was not available.
1988   if (SharedModuleInfo::IsSharedModule(extension))
1989     MaybeFinishDelayedInstallations();
1990 }
1991
1992 void ExtensionService::PromoteEphemeralApp(
1993     const extensions::Extension* extension, bool is_from_sync) {
1994   DCHECK(GetInstalledExtension(extension->id()) &&
1995          extension_prefs_->IsEphemeralApp(extension->id()));
1996
1997   if (extension->RequiresSortOrdinal()) {
1998     extension_prefs_->app_sorting()->SetExtensionVisible(
1999         extension->id(), extension->ShouldDisplayInNewTabPage());
2000
2001     if (!is_from_sync) {
2002       // Reset the sort ordinals of the app to ensure it is added to the default
2003       // position, like newly installed apps would.
2004       extension_prefs_->app_sorting()->ClearOrdinals(extension->id());
2005     }
2006
2007     extension_prefs_->app_sorting()->EnsureValidOrdinals(
2008         extension->id(), syncer::StringOrdinal());
2009   }
2010
2011   // Remove the ephemeral flags from the preferences.
2012   extension_prefs_->OnEphemeralAppPromoted(extension->id());
2013
2014   // Fire install-related events to allow observers to handle the promotion
2015   // of the ephemeral app.
2016   extensions::InstalledExtensionInfo details(
2017       extension,
2018       true /* is update */,
2019       true /* from ephemeral */,
2020       extension->name() /* old name */);
2021   content::NotificationService::current()->Notify(
2022       extensions::NOTIFICATION_EXTENSION_WILL_BE_INSTALLED_DEPRECATED,
2023       content::Source<Profile>(profile_),
2024       content::Details<const extensions::InstalledExtensionInfo>(&details));
2025
2026   registry_->TriggerOnWillBeInstalled(
2027       extension,
2028       true /* is update */,
2029       true /* from ephemeral */,
2030       extension->name() /* old name */);
2031
2032   if (registry_->enabled_extensions().Contains(extension->id())) {
2033     // If the app is already enabled and loaded, fire the load events to allow
2034     // observers to handle the promotion of the ephemeral app.
2035     content::NotificationService::current()->Notify(
2036         extensions::NOTIFICATION_EXTENSION_LOADED_DEPRECATED,
2037         content::Source<Profile>(profile_),
2038         content::Details<const Extension>(extension));
2039
2040     registry_->TriggerOnLoaded(extension);
2041   } else {
2042     // Cached ephemeral apps may be updated and disabled due to permissions
2043     // increase. The app can be enabled (as long as no other disable reasons
2044     // exist) as the install was user-acknowledged.
2045     int disable_mask = Extension::DISABLE_NONE;
2046     if (!is_from_sync)
2047       disable_mask |= Extension::DISABLE_PERMISSIONS_INCREASE;
2048
2049     int other_disable_reasons =
2050         extension_prefs_->GetDisableReasons(extension->id()) & ~disable_mask;
2051     if (!other_disable_reasons) {
2052       if (extension_prefs_->DidExtensionEscalatePermissions(extension->id()))
2053         GrantPermissionsAndEnableExtension(extension);
2054       else
2055         EnableExtension(extension->id());
2056     }
2057   }
2058
2059   registry_->TriggerOnInstalled(extension, true);
2060
2061   if (!is_from_sync) {
2062     ExtensionSyncService::Get(profile_)->SyncExtensionChangeIfNeeded(
2063         *extension);
2064   }
2065 }
2066
2067 const Extension* ExtensionService::GetPendingExtensionUpdate(
2068     const std::string& id) const {
2069   return delayed_installs_.GetByID(id);
2070 }
2071
2072 void ExtensionService::RegisterContentSettings(
2073     HostContentSettingsMap* host_content_settings_map) {
2074   TRACE_EVENT0("browser,startup", "ExtensionService::RegisterContentSettings");
2075   DCHECK_CURRENTLY_ON(BrowserThread::UI);
2076   host_content_settings_map->RegisterProvider(
2077       HostContentSettingsMap::INTERNAL_EXTENSION_PROVIDER,
2078       scoped_ptr<content_settings::ObservableProvider>(
2079           new content_settings::InternalExtensionProvider(profile_)));
2080
2081   host_content_settings_map->RegisterProvider(
2082       HostContentSettingsMap::CUSTOM_EXTENSION_PROVIDER,
2083       scoped_ptr<content_settings::ObservableProvider>(
2084           new content_settings::CustomExtensionProvider(
2085               extensions::ContentSettingsService::Get(
2086                   profile_)->content_settings_store(),
2087               profile_->GetOriginalProfile() != profile_)));
2088 }
2089
2090 void ExtensionService::TrackTerminatedExtension(
2091     const std::string& extension_id) {
2092   extensions_being_terminated_.erase(extension_id);
2093
2094   const Extension* extension = GetInstalledExtension(extension_id);
2095   if (!extension) {
2096     return;
2097   }
2098
2099   // No need to check for duplicates; inserting a duplicate is a no-op.
2100   registry_->AddTerminated(make_scoped_refptr(extension));
2101   UnloadExtension(extension->id(), UnloadedExtensionInfo::REASON_TERMINATE);
2102 }
2103
2104 void ExtensionService::TerminateExtension(const std::string& extension_id) {
2105   TrackTerminatedExtension(extension_id);
2106 }
2107
2108 void ExtensionService::UntrackTerminatedExtension(const std::string& id) {
2109   std::string lowercase_id = base::StringToLowerASCII(id);
2110   const Extension* extension =
2111       registry_->terminated_extensions().GetByID(lowercase_id);
2112   registry_->RemoveTerminated(lowercase_id);
2113   if (extension) {
2114     content::NotificationService::current()->Notify(
2115         extensions::NOTIFICATION_EXTENSION_REMOVED,
2116         content::Source<Profile>(profile_),
2117         content::Details<const Extension>(extension));
2118   }
2119 }
2120
2121 const Extension* ExtensionService::GetInstalledExtension(
2122     const std::string& id) const {
2123   return registry_->GetExtensionById(id, ExtensionRegistry::EVERYTHING);
2124 }
2125
2126 bool ExtensionService::OnExternalExtensionFileFound(
2127          const std::string& id,
2128          const Version* version,
2129          const base::FilePath& path,
2130          Manifest::Location location,
2131          int creation_flags,
2132          bool mark_acknowledged,
2133          bool install_immediately) {
2134   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
2135   CHECK(crx_file::id_util::IdIsValid(id));
2136   if (extension_prefs_->IsExternalExtensionUninstalled(id))
2137     return false;
2138
2139   // Before even bothering to unpack, check and see if we already have this
2140   // version. This is important because these extensions are going to get
2141   // installed on every startup.
2142   const Extension* existing = GetExtensionById(id, true);
2143
2144   if (existing) {
2145     // The default apps will have the location set as INTERNAL. Since older
2146     // default apps are installed as EXTERNAL, we override them. However, if the
2147     // app is already installed as internal, then do the version check.
2148     // TODO(grv) : Remove after Q1-2013.
2149     bool is_default_apps_migration =
2150         (location == Manifest::INTERNAL &&
2151          Manifest::IsExternalLocation(existing->location()));
2152
2153     if (!is_default_apps_migration) {
2154       DCHECK(version);
2155
2156       switch (existing->version()->CompareTo(*version)) {
2157         case -1:  // existing version is older, we should upgrade
2158           break;
2159         case 0:  // existing version is same, do nothing
2160           return false;
2161         case 1:  // existing version is newer, uh-oh
2162           LOG(WARNING) << "Found external version of extension " << id
2163                        << "that is older than current version. Current version "
2164                        << "is: " << existing->VersionString() << ". New "
2165                        << "version is: " << version->GetString()
2166                        << ". Keeping current version.";
2167           return false;
2168       }
2169     }
2170   }
2171
2172   // If the extension is already pending, don't start an install.
2173   if (!pending_extension_manager()->AddFromExternalFile(
2174           id, location, *version, creation_flags, mark_acknowledged)) {
2175     return false;
2176   }
2177
2178   // no client (silent install)
2179   scoped_refptr<CrxInstaller> installer(CrxInstaller::CreateSilent(this));
2180   installer->set_install_source(location);
2181   installer->set_expected_id(id);
2182   installer->set_expected_version(*version);
2183   installer->set_install_cause(extension_misc::INSTALL_CAUSE_EXTERNAL_FILE);
2184   installer->set_install_immediately(install_immediately);
2185   installer->set_creation_flags(creation_flags);
2186 #if defined(OS_CHROMEOS)
2187   extensions::InstallLimiter::Get(profile_)->Add(installer, path);
2188 #else
2189   installer->InstallCrx(path);
2190 #endif
2191
2192   // Depending on the source, a new external extension might not need a user
2193   // notification on installation. For such extensions, mark them acknowledged
2194   // now to suppress the notification.
2195   if (mark_acknowledged)
2196     external_install_manager_->AcknowledgeExternalExtension(id);
2197
2198   return true;
2199 }
2200
2201 void ExtensionService::DidCreateRenderViewForBackgroundPage(
2202     extensions::ExtensionHost* host) {
2203   OrphanedDevTools::iterator iter =
2204       orphaned_dev_tools_.find(host->extension_id());
2205   if (iter == orphaned_dev_tools_.end())
2206     return;
2207
2208   iter->second->ConnectWebContents(host->host_contents());
2209   orphaned_dev_tools_.erase(iter);
2210 }
2211
2212 void ExtensionService::Observe(int type,
2213                                const content::NotificationSource& source,
2214                                const content::NotificationDetails& details) {
2215   switch (type) {
2216     case chrome::NOTIFICATION_APP_TERMINATING:
2217       // Shutdown has started. Don't start any more extension installs.
2218       // (We cannot use ExtensionService::Shutdown() for this because it
2219       // happens too late in browser teardown.)
2220       browser_terminating_ = true;
2221       break;
2222     case extensions::NOTIFICATION_EXTENSION_PROCESS_TERMINATED: {
2223       if (profile_ !=
2224           content::Source<Profile>(source).ptr()->GetOriginalProfile()) {
2225         break;
2226       }
2227
2228       extensions::ExtensionHost* host =
2229           content::Details<extensions::ExtensionHost>(details).ptr();
2230
2231       // If the extension is already being terminated, there is nothing left to
2232       // do.
2233       if (!extensions_being_terminated_.insert(host->extension_id()).second)
2234         break;
2235
2236       // Mark the extension as terminated and Unload it. We want it to
2237       // be in a consistent state: either fully working or not loaded
2238       // at all, but never half-crashed.  We do it in a PostTask so
2239       // that other handlers of this notification will still have
2240       // access to the Extension and ExtensionHost.
2241       base::ThreadTaskRunnerHandle::Get()->PostTask(
2242           FROM_HERE, base::Bind(&ExtensionService::TrackTerminatedExtension,
2243                                 AsWeakPtr(), host->extension()->id()));
2244       break;
2245     }
2246     case content::NOTIFICATION_RENDERER_PROCESS_TERMINATED: {
2247       content::RenderProcessHost* process =
2248           content::Source<content::RenderProcessHost>(source).ptr();
2249       Profile* host_profile =
2250           Profile::FromBrowserContext(process->GetBrowserContext());
2251       if (!profile_->IsSameProfile(host_profile->GetOriginalProfile()))
2252           break;
2253
2254       extensions::ProcessMap* process_map =
2255           extensions::ProcessMap::Get(profile_);
2256       if (process_map->Contains(process->GetID())) {
2257         // An extension process was terminated, this might have resulted in an
2258         // app or extension becoming idle.
2259         std::set<std::string> extension_ids =
2260             process_map->GetExtensionsInProcess(process->GetID());
2261         // In addition to the extensions listed in the process map, one of those
2262         // extensions could be referencing a shared module which is waiting for
2263         // idle to update.  Check all imports of these extensions, too.
2264         std::set<std::string> import_ids;
2265         for (std::set<std::string>::const_iterator it = extension_ids.begin();
2266              it != extension_ids.end();
2267              ++it) {
2268           const Extension* extension = GetExtensionById(*it, true);
2269           if (!extension)
2270             continue;
2271           const std::vector<SharedModuleInfo::ImportInfo>& imports =
2272               SharedModuleInfo::GetImports(extension);
2273           std::vector<SharedModuleInfo::ImportInfo>::const_iterator import_it;
2274           for (import_it = imports.begin(); import_it != imports.end();
2275                import_it++) {
2276             import_ids.insert((*import_it).extension_id);
2277           }
2278         }
2279         extension_ids.insert(import_ids.begin(), import_ids.end());
2280
2281         for (std::set<std::string>::const_iterator it = extension_ids.begin();
2282              it != extension_ids.end(); ++it) {
2283           if (delayed_installs_.Contains(*it)) {
2284             base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
2285                 FROM_HERE,
2286                 base::Bind(&ExtensionService::MaybeFinishDelayedInstallation,
2287                            AsWeakPtr(), *it),
2288                 base::TimeDelta::FromSeconds(kUpdateIdleDelay));
2289           }
2290         }
2291       }
2292
2293       process_map->RemoveAllFromProcess(process->GetID());
2294       BrowserThread::PostTask(
2295           BrowserThread::IO,
2296           FROM_HERE,
2297           base::Bind(&extensions::InfoMap::UnregisterAllExtensionsInProcess,
2298                      system_->info_map(),
2299                      process->GetID()));
2300       break;
2301     }
2302     case chrome::NOTIFICATION_UPGRADE_RECOMMENDED: {
2303       // Notify observers that chrome update is available.
2304       FOR_EACH_OBSERVER(extensions::UpdateObserver, update_observers_,
2305                         OnChromeUpdateAvailable());
2306       break;
2307     }
2308     case chrome::NOTIFICATION_PROFILE_DESTRUCTION_STARTED: {
2309       OnProfileDestructionStarted();
2310       break;
2311     }
2312
2313     default:
2314       NOTREACHED() << "Unexpected notification type.";
2315   }
2316 }
2317
2318 int ExtensionService::GetDisableReasonsOnInstalled(const Extension* extension) {
2319   Extension::DisableReason disable_reason;
2320   // Extensions disabled by management policy should always be disabled, even
2321   // if it's force-installed.
2322   if (system_->management_policy()->MustRemainDisabled(
2323           extension, &disable_reason, nullptr)) {
2324     // A specified reason is required to disable the extension.
2325     DCHECK(disable_reason != Extension::DISABLE_NONE);
2326     return disable_reason;
2327   }
2328
2329   // Extensions installed by policy can't be disabled. So even if a previous
2330   // installation disabled the extension, make sure it is now enabled.
2331   if (system_->management_policy()->MustRemainEnabled(extension, nullptr))
2332     return Extension::DISABLE_NONE;
2333
2334   // An already disabled extension should inherit the disable reasons and
2335   // remain disabled.
2336   if (extension_prefs_->IsExtensionDisabled(extension->id())) {
2337     int disable_reasons = extension_prefs_->GetDisableReasons(extension->id());
2338     // If an extension was disabled without specified reason, presume it's
2339     // disabled by user.
2340     return disable_reasons == Extension::DISABLE_NONE
2341                ? Extension::DISABLE_USER_ACTION
2342                : disable_reasons;
2343   }
2344
2345   if (FeatureSwitch::prompt_for_external_extensions()->IsEnabled()) {
2346     // External extensions are initially disabled. We prompt the user before
2347     // enabling them. Hosted apps are excepted because they are not dangerous
2348     // (they need to be launched by the user anyway).
2349     if (extension->GetType() != Manifest::TYPE_HOSTED_APP &&
2350         Manifest::IsExternalLocation(extension->location()) &&
2351         !extension_prefs_->IsExternalExtensionAcknowledged(extension->id())) {
2352       return Extension::DISABLE_EXTERNAL_EXTENSION;
2353     }
2354   }
2355
2356   return Extension::DISABLE_NONE;
2357 }
2358
2359 // Helper method to determine if an extension can be blocked.
2360 bool ExtensionService::CanBlockExtension(const Extension* extension) const {
2361   DCHECK(extension);
2362   return extension->location() != Manifest::COMPONENT &&
2363          extension->location() != Manifest::EXTERNAL_COMPONENT &&
2364          !system_->management_policy()->MustRemainEnabled(extension, NULL);
2365 }
2366
2367 bool ExtensionService::ShouldDelayExtensionUpdate(
2368     const std::string& extension_id,
2369     bool install_immediately) const {
2370   const char kOnUpdateAvailableEvent[] = "runtime.onUpdateAvailable";
2371
2372   // If delayed updates are globally disabled, or just for this extension,
2373   // don't delay.
2374   if (!install_updates_when_idle_ || install_immediately)
2375     return false;
2376
2377   const Extension* old = GetInstalledExtension(extension_id);
2378   // If there is no old extension, this is not an update, so don't delay.
2379   if (!old)
2380     return false;
2381
2382   if (extensions::BackgroundInfo::HasPersistentBackgroundPage(old)) {
2383     // Delay installation if the extension listens for the onUpdateAvailable
2384     // event.
2385     return extensions::EventRouter::Get(profile_)
2386         ->ExtensionHasEventListener(extension_id, kOnUpdateAvailableEvent);
2387   } else {
2388     // Delay installation if the extension is not idle.
2389     return !extensions::util::IsExtensionIdle(extension_id, profile_);
2390   }
2391 }
2392
2393 void ExtensionService::OnGarbageCollectIsolatedStorageStart() {
2394   DCHECK(!installs_delayed_for_gc_);
2395   installs_delayed_for_gc_ = true;
2396 }
2397
2398 void ExtensionService::OnGarbageCollectIsolatedStorageFinished() {
2399   DCHECK(installs_delayed_for_gc_);
2400   installs_delayed_for_gc_ = false;
2401   MaybeFinishDelayedInstallations();
2402 }
2403
2404 void ExtensionService::MaybeFinishDelayedInstallations() {
2405   std::vector<std::string> to_be_installed;
2406   for (ExtensionSet::const_iterator it = delayed_installs_.begin();
2407        it != delayed_installs_.end();
2408        ++it) {
2409     to_be_installed.push_back((*it)->id());
2410   }
2411   for (std::vector<std::string>::const_iterator it = to_be_installed.begin();
2412        it != to_be_installed.end();
2413        ++it) {
2414     MaybeFinishDelayedInstallation(*it);
2415   }
2416 }
2417
2418 void ExtensionService::OnBlacklistUpdated() {
2419   blacklist_->GetBlacklistedIDs(
2420       registry_->GenerateInstalledExtensionsSet()->GetIDs(),
2421       base::Bind(&ExtensionService::ManageBlacklist, AsWeakPtr()));
2422 }
2423
2424 void ExtensionService::ManageBlacklist(
2425     const extensions::Blacklist::BlacklistStateMap& state_map) {
2426   DCHECK_CURRENTLY_ON(BrowserThread::UI);
2427
2428   std::set<std::string> blacklisted;
2429   ExtensionIdSet greylist;
2430   ExtensionIdSet unchanged;
2431   for (extensions::Blacklist::BlacklistStateMap::const_iterator it =
2432            state_map.begin();
2433        it != state_map.end();
2434        ++it) {
2435     switch (it->second) {
2436       case extensions::NOT_BLACKLISTED:
2437         break;
2438
2439       case extensions::BLACKLISTED_MALWARE:
2440         blacklisted.insert(it->first);
2441         break;
2442
2443       case extensions::BLACKLISTED_SECURITY_VULNERABILITY:
2444       case extensions::BLACKLISTED_CWS_POLICY_VIOLATION:
2445       case extensions::BLACKLISTED_POTENTIALLY_UNWANTED:
2446         greylist.insert(it->first);
2447         break;
2448
2449       case extensions::BLACKLISTED_UNKNOWN:
2450         unchanged.insert(it->first);
2451         break;
2452     }
2453   }
2454
2455   UpdateBlacklistedExtensions(blacklisted, unchanged);
2456   UpdateGreylistedExtensions(greylist, unchanged, state_map);
2457
2458   error_controller_->ShowErrorIfNeeded();
2459 }
2460
2461 namespace {
2462 void Partition(const ExtensionIdSet& before,
2463                const ExtensionIdSet& after,
2464                const ExtensionIdSet& unchanged,
2465                ExtensionIdSet* no_longer,
2466                ExtensionIdSet* not_yet) {
2467   *not_yet   = base::STLSetDifference<ExtensionIdSet>(after, before);
2468   *no_longer = base::STLSetDifference<ExtensionIdSet>(before, after);
2469   *no_longer = base::STLSetDifference<ExtensionIdSet>(*no_longer, unchanged);
2470 }
2471 }  // namespace
2472
2473 void ExtensionService::UpdateBlacklistedExtensions(
2474     const ExtensionIdSet& blacklisted,
2475     const ExtensionIdSet& unchanged) {
2476   ExtensionIdSet not_yet_blocked, no_longer_blocked;
2477   Partition(registry_->blacklisted_extensions().GetIDs(), blacklisted,
2478             unchanged, &no_longer_blocked, &not_yet_blocked);
2479
2480   for (ExtensionIdSet::iterator it = no_longer_blocked.begin();
2481        it != no_longer_blocked.end(); ++it) {
2482     scoped_refptr<const Extension> extension =
2483         registry_->blacklisted_extensions().GetByID(*it);
2484     if (!extension.get()) {
2485       NOTREACHED() << "Extension " << *it << " no longer blacklisted, "
2486                    << "but it was never blacklisted.";
2487       continue;
2488     }
2489     registry_->RemoveBlacklisted(*it);
2490     extension_prefs_->SetExtensionBlacklisted(extension->id(), false);
2491     AddExtension(extension.get());
2492     UMA_HISTOGRAM_ENUMERATION("ExtensionBlacklist.UnblacklistInstalled",
2493                               extension->location(),
2494                               Manifest::NUM_LOCATIONS);
2495   }
2496
2497   for (ExtensionIdSet::iterator it = not_yet_blocked.begin();
2498        it != not_yet_blocked.end(); ++it) {
2499     scoped_refptr<const Extension> extension = GetInstalledExtension(*it);
2500     if (!extension.get()) {
2501       NOTREACHED() << "Extension " << *it << " needs to be "
2502                    << "blacklisted, but it's not installed.";
2503       continue;
2504     }
2505     registry_->AddBlacklisted(extension);
2506     extension_prefs_->SetExtensionBlacklistState(
2507         extension->id(), extensions::BLACKLISTED_MALWARE);
2508     UnloadExtension(*it, UnloadedExtensionInfo::REASON_BLACKLIST);
2509     UMA_HISTOGRAM_ENUMERATION("ExtensionBlacklist.BlacklistInstalled",
2510                               extension->location(), Manifest::NUM_LOCATIONS);
2511   }
2512 }
2513
2514 // TODO(oleg): UMA logging
2515 void ExtensionService::UpdateGreylistedExtensions(
2516     const ExtensionIdSet& greylist,
2517     const ExtensionIdSet& unchanged,
2518     const extensions::Blacklist::BlacklistStateMap& state_map) {
2519   ExtensionIdSet not_yet_greylisted, no_longer_greylisted;
2520   Partition(greylist_.GetIDs(),
2521             greylist, unchanged,
2522             &no_longer_greylisted, &not_yet_greylisted);
2523
2524   for (ExtensionIdSet::iterator it = no_longer_greylisted.begin();
2525        it != no_longer_greylisted.end(); ++it) {
2526     scoped_refptr<const Extension> extension = greylist_.GetByID(*it);
2527     if (!extension.get()) {
2528       NOTREACHED() << "Extension " << *it << " no longer greylisted, "
2529                    << "but it was not marked as greylisted.";
2530       continue;
2531     }
2532
2533     greylist_.Remove(*it);
2534     extension_prefs_->SetExtensionBlacklistState(extension->id(),
2535                                                  extensions::NOT_BLACKLISTED);
2536     if (extension_prefs_->GetDisableReasons(extension->id()) &
2537         extensions::Extension::DISABLE_GREYLIST)
2538       EnableExtension(*it);
2539   }
2540
2541   for (ExtensionIdSet::iterator it = not_yet_greylisted.begin();
2542        it != not_yet_greylisted.end(); ++it) {
2543     scoped_refptr<const Extension> extension = GetInstalledExtension(*it);
2544     if (!extension.get()) {
2545       NOTREACHED() << "Extension " << *it << " needs to be "
2546                    << "disabled, but it's not installed.";
2547       continue;
2548     }
2549     greylist_.Insert(extension);
2550     extension_prefs_->SetExtensionBlacklistState(extension->id(),
2551                                                  state_map.find(*it)->second);
2552     if (registry_->enabled_extensions().Contains(extension->id()))
2553       DisableExtension(*it, extensions::Extension::DISABLE_GREYLIST);
2554   }
2555 }
2556
2557 void ExtensionService::AddUpdateObserver(extensions::UpdateObserver* observer) {
2558   update_observers_.AddObserver(observer);
2559 }
2560
2561 void ExtensionService::RemoveUpdateObserver(
2562     extensions::UpdateObserver* observer) {
2563   update_observers_.RemoveObserver(observer);
2564 }
2565
2566 // Used only by test code.
2567 void ExtensionService::UnloadAllExtensionsInternal() {
2568   profile_->GetExtensionSpecialStoragePolicy()->RevokeRightsForAllExtensions();
2569
2570   registry_->ClearAll();
2571   system_->runtime_data()->ClearAll();
2572
2573   // TODO(erikkay) should there be a notification for this?  We can't use
2574   // EXTENSION_UNLOADED since that implies that the extension has been disabled
2575   // or uninstalled.
2576 }
2577
2578 void ExtensionService::OnProfileDestructionStarted() {
2579   ExtensionIdSet ids_to_unload = registry_->enabled_extensions().GetIDs();
2580   for (ExtensionIdSet::iterator it = ids_to_unload.begin();
2581        it != ids_to_unload.end();
2582        ++it) {
2583     UnloadExtension(*it, UnloadedExtensionInfo::REASON_PROFILE_SHUTDOWN);
2584   }
2585 }