chrome/browser/sync/profile_sync_service.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/sync/profile_sync_service.h"
   6
   7 #include <cstddef>
   8 #include <map>
   9 #include <vector>
  10
  11 #include "base/basictypes.h"
  12 #include "base/bind.h"
  13 #include "base/bind_helpers.h"
  14 #include "base/callback.h"
  15 #include "base/command_line.h"
  16 #include "base/compiler_specific.h"
  17 #include "base/files/file_util.h"
  18 #include "base/logging.h"
  19 #include "base/memory/ref_counted.h"
  20 #include "base/message_loop/message_loop.h"
  21 #include "base/metrics/histogram.h"
  22 #include "base/profiler/scoped_profile.h"
  23 #include "base/strings/string16.h"
  24 #include "base/strings/stringprintf.h"
  25 #include "base/threading/thread_restrictions.h"
  26 #include "build/build_config.h"
  27 #include "chrome/browser/bookmarks/enhanced_bookmarks_features.h"
  28 #include "chrome/browser/browser_process.h"
  29 #include "chrome/browser/browsing_data/browsing_data_helper.h"
  30 #include "chrome/browser/chrome_notification_types.h"
  31 #include "chrome/browser/defaults.h"
  32 #include "chrome/browser/invalidation/profile_invalidation_provider_factory.h"
  33 #include "chrome/browser/net/chrome_cookie_notification_details.h"
  34 #include "chrome/browser/password_manager/password_store_factory.h"
  35 #include "chrome/browser/prefs/chrome_pref_service_factory.h"
  36 #include "chrome/browser/prefs/pref_service_syncable.h"
  37 #include "chrome/browser/profiles/profile.h"
  38 #include "chrome/browser/services/gcm/gcm_profile_service.h"
  39 #include "chrome/browser/services/gcm/gcm_profile_service_factory.h"
  40 #include "chrome/browser/signin/about_signin_internals_factory.h"
  41 #include "chrome/browser/signin/chrome_signin_client_factory.h"
  42 #include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
  43 #include "chrome/browser/signin/signin_manager_factory.h"
  44 #include "chrome/browser/sync/backend_migrator.h"
  45 #include "chrome/browser/sync/glue/chrome_report_unrecoverable_error.h"
  46 #include "chrome/browser/sync/glue/favicon_cache.h"
  47 #include "chrome/browser/sync/glue/sync_backend_host.h"
  48 #include "chrome/browser/sync/glue/sync_backend_host_impl.h"
  49 #include "chrome/browser/sync/glue/sync_start_util.h"
  50 #include "chrome/browser/sync/glue/typed_url_data_type_controller.h"
  51 #include "chrome/browser/sync/profile_sync_components_factory_impl.h"
  52 #include "chrome/browser/sync/sessions/notification_service_sessions_router.h"
  53 #include "chrome/browser/sync/supervised_user_signin_manager_wrapper.h"
  54 #include "chrome/browser/sync/sync_error_controller.h"
  55 #include "chrome/browser/sync/sync_type_preference_provider.h"
  56 #include "chrome/browser/ui/browser.h"
  57 #include "chrome/browser/ui/browser_list.h"
  58 #include "chrome/browser/ui/browser_window.h"
  59 #include "chrome/browser/ui/global_error/global_error_service.h"
  60 #include "chrome/browser/ui/global_error/global_error_service_factory.h"
  61 #include "chrome/common/chrome_switches.h"
  62 #include "chrome/common/chrome_version_info.h"
  63 #include "chrome/common/pref_names.h"
  64 #include "chrome/common/url_constants.h"
  65 #include "chrome/grit/generated_resources.h"
  66 #include "components/gcm_driver/gcm_driver.h"
  67 #include "components/invalidation/invalidation_service.h"
  68 #include "components/invalidation/profile_invalidation_provider.h"
  69 #include "components/password_manager/core/browser/password_store.h"
  70 #include "components/pref_registry/pref_registry_syncable.h"
  71 #include "components/signin/core/browser/about_signin_internals.h"
  72 #include "components/signin/core/browser/profile_oauth2_token_service.h"
  73 #include "components/signin/core/browser/signin_manager.h"
  74 #include "components/signin/core/browser/signin_metrics.h"
  75 #include "components/sync_driver/change_processor.h"
  76 #include "components/sync_driver/data_type_controller.h"
  77 #include "components/sync_driver/device_info.h"
  78 #include "components/sync_driver/pref_names.h"
  79 #include "components/sync_driver/system_encryptor.h"
  80 #include "components/sync_driver/user_selectable_sync_type.h"
  81 #include "content/public/browser/browser_thread.h"
  82 #include "content/public/browser/notification_details.h"
  83 #include "content/public/browser/notification_service.h"
  84 #include "content/public/browser/notification_source.h"
  85 #include "net/cookies/cookie_monster.h"
  86 #include "net/url_request/url_request_context_getter.h"
  87 #include "sync/api/sync_error.h"
  88 #include "sync/internal_api/public/configure_reason.h"
  89 #include "sync/internal_api/public/http_bridge_network_resources.h"
  90 #include "sync/internal_api/public/network_resources.h"
  91 #include "sync/internal_api/public/sessions/type_debug_info_observer.h"
  92 #include "sync/internal_api/public/shutdown_reason.h"
  93 #include "sync/internal_api/public/sync_context_proxy.h"
  94 #include "sync/internal_api/public/sync_encryption_handler.h"
  95 #include "sync/internal_api/public/util/experiments.h"
  96 #include "sync/internal_api/public/util/sync_db_util.h"
  97 #include "sync/internal_api/public/util/sync_string_conversions.h"
  98 #include "sync/js/js_event_details.h"
  99 #include "sync/util/cryptographer.h"
 100 #include "ui/base/l10n/l10n_util.h"
 101 #include "ui/base/l10n/time_format.h"
 102
 103 #if defined(OS_ANDROID)
 104 #include "sync/internal_api/public/read_transaction.h"
 105 #endif
 106
 107 using browser_sync::NotificationServiceSessionsRouter;
 108 using browser_sync::ProfileSyncServiceStartBehavior;
 109 using browser_sync::SessionsSyncManager;
 110 using browser_sync::SyncBackendHost;
 111 using sync_driver::ChangeProcessor;
 112 using sync_driver::DataTypeController;
 113 using sync_driver::DataTypeManager;
 114 using sync_driver::DataTypeStatusTable;
 115 using sync_driver::DeviceInfoSyncService;
 116 using syncer::ModelType;
 117 using syncer::ModelTypeSet;
 118 using syncer::JsBackend;
 119 using syncer::JsController;
 120 using syncer::JsEventDetails;
 121 using syncer::JsEventHandler;
 122 using syncer::ModelSafeRoutingInfo;
 123 using syncer::SyncCredentials;
 124 using syncer::SyncProtocolError;
 125 using syncer::WeakHandle;
 126
 127 typedef GoogleServiceAuthError AuthError;
 128
 129 const char* ProfileSyncService::kSyncServerUrl =
 130     "https://clients4.google.com/chrome-sync";
 131
 132 const char* ProfileSyncService::kDevServerUrl =
 133     "https://clients4.google.com/chrome-sync/dev";
 134
 135 const char kSyncUnrecoverableErrorHistogram[] =
 136     "Sync.UnrecoverableErrors";
 137
 138 const net::BackoffEntry::Policy kRequestAccessTokenBackoffPolicy = {
 139   // Number of initial errors (in sequence) to ignore before applying
 140   // exponential back-off rules.
 141   0,
 142
 143   // Initial delay for exponential back-off in ms.
 144   2000,
 145
 146   // Factor by which the waiting time will be multiplied.
 147   2,
 148
 149   // Fuzzing percentage. ex: 10% will spread requests randomly
 150   // between 90%-100% of the calculated time.
 151   0.2, // 20%
 152
 153   // Maximum amount of time we are willing to delay our request in ms.
 154   // TODO(pavely): crbug.com/246686 ProfileSyncService should retry
 155   // RequestAccessToken on connection state change after backoff
 156   1000 * 3600 * 4, // 4 hours.
 157
 158   // Time to keep an entry from being discarded even when it
 159   // has no significant state, -1 to never discard.
 160   -1,
 161
 162   // Don't use initial delay unless the last request was an error.
 163   false,
 164 };
 165
 166 static const base::FilePath::CharType kSyncDataFolderName[] =
 167     FILE_PATH_LITERAL("Sync Data");
 168
 169 static const base::FilePath::CharType kSyncBackupDataFolderName[] =
 170     FILE_PATH_LITERAL("Sync Data Backup");
 171
 172 namespace {
 173
 174 void ClearBrowsingData(BrowsingDataRemover::Observer* observer,
 175                        Profile* profile,
 176                        base::Time start,
 177                        base::Time end) {
 178   // BrowsingDataRemover deletes itself when it's done.
 179   BrowsingDataRemover* remover = BrowsingDataRemover::CreateForRange(
 180       profile, start, end);
 181   if (observer)
 182     remover->AddObserver(observer);
 183   remover->Remove(BrowsingDataRemover::REMOVE_ALL,
 184                   BrowsingDataHelper::ALL);
 185
 186   scoped_refptr<password_manager::PasswordStore> password =
 187       PasswordStoreFactory::GetForProfile(profile, Profile::EXPLICIT_ACCESS);
 188   password->RemoveLoginsSyncedBetween(start, end);
 189 }
 190
 191 }  // anonymous namespace
 192
 193 bool ShouldShowActionOnUI(
 194     const syncer::SyncProtocolError& error) {
 195   return (error.action != syncer::UNKNOWN_ACTION &&
 196           error.action != syncer::DISABLE_SYNC_ON_CLIENT &&
 197           error.action != syncer::STOP_SYNC_FOR_DISABLED_ACCOUNT);
 198 }
 199
 200 ProfileSyncService::ProfileSyncService(
 201     scoped_ptr<ProfileSyncComponentsFactory> factory,
 202     Profile* profile,
 203     scoped_ptr<SupervisedUserSigninManagerWrapper> signin_wrapper,
 204     ProfileOAuth2TokenService* oauth2_token_service,
 205     ProfileSyncServiceStartBehavior start_behavior)
 206     : OAuth2TokenService::Consumer("sync"),
 207       last_auth_error_(AuthError::AuthErrorNone()),
 208       passphrase_required_reason_(syncer::REASON_PASSPHRASE_NOT_REQUIRED),
 209       factory_(factory.Pass()),
 210       profile_(profile),
 211       sync_prefs_(profile_->GetPrefs()),
 212       sync_service_url_(GetSyncServiceURL(*CommandLine::ForCurrentProcess())),
 213       is_first_time_sync_configure_(false),
 214       backend_initialized_(false),
 215       sync_disabled_by_admin_(false),
 216       is_auth_in_progress_(false),
 217       signin_(signin_wrapper.Pass()),
 218       unrecoverable_error_reason_(ERROR_REASON_UNSET),
 219       expect_sync_configuration_aborted_(false),
 220       encrypted_types_(syncer::SyncEncryptionHandler::SensitiveTypes()),
 221       encrypt_everything_(false),
 222       encryption_pending_(false),
 223       configure_status_(DataTypeManager::UNKNOWN),
 224       oauth2_token_service_(oauth2_token_service),
 225       request_access_token_backoff_(&kRequestAccessTokenBackoffPolicy),
 226       weak_factory_(this),
 227       startup_controller_weak_factory_(this),
 228       connection_status_(syncer::CONNECTION_NOT_ATTEMPTED),
 229       last_get_token_error_(GoogleServiceAuthError::AuthErrorNone()),
 230       network_resources_(new syncer::HttpBridgeNetworkResources),
 231       startup_controller_(
 232           start_behavior,
 233           oauth2_token_service,
 234           &sync_prefs_,
 235           signin_.get(),
 236           base::Bind(&ProfileSyncService::StartUpSlowBackendComponents,
 237                      startup_controller_weak_factory_.GetWeakPtr(),
 238                      SYNC)),
 239       backup_rollback_controller_(
 240           &sync_prefs_,
 241           signin_.get(),
 242           base::Bind(&ProfileSyncService::StartUpSlowBackendComponents,
 243                      startup_controller_weak_factory_.GetWeakPtr(),
 244                      BACKUP),
 245           base::Bind(&ProfileSyncService::StartUpSlowBackendComponents,
 246                      startup_controller_weak_factory_.GetWeakPtr(),
 247                      ROLLBACK)),
 248       backend_mode_(IDLE),
 249       need_backup_(false),
 250       backup_finished_(false),
 251       clear_browsing_data_(base::Bind(&ClearBrowsingData)),
 252       browsing_data_remover_observer_(NULL) {
 253   DCHECK(profile);
 254   syncer::SyncableService::StartSyncFlare flare(
 255       sync_start_util::GetFlareForSyncableService(profile->GetPath()));
 256   scoped_ptr<browser_sync::LocalSessionEventRouter> router(
 257       new NotificationServiceSessionsRouter(profile, flare));
 258
 259   DCHECK(factory_.get());
 260   local_device_ = factory_->CreateLocalDeviceInfoProvider();
 261   sessions_sync_manager_.reset(
 262       new SessionsSyncManager(profile, local_device_.get(), router.Pass()));
 263   device_info_sync_service_.reset(
 264       new DeviceInfoSyncService(local_device_.get()));
 265 }
 266
 267 ProfileSyncService::~ProfileSyncService() {
 268   sync_prefs_.RemoveSyncPrefObserver(this);
 269   // Shutdown() should have been called before destruction.
 270   CHECK(!backend_initialized_);
 271 }
 272
 273 bool ProfileSyncService::IsSyncEnabledAndLoggedIn() {
 274   // Exit if sync is disabled.
 275   if (IsManaged() || sync_prefs_.IsStartSuppressed())
 276     return false;
 277
 278   // Sync is logged in if there is a non-empty effective username.
 279   return !signin_->GetEffectiveUsername().empty();
 280 }
 281
 282 bool ProfileSyncService::IsOAuthRefreshTokenAvailable() {
 283   if (!oauth2_token_service_)
 284     return false;
 285
 286   return oauth2_token_service_->RefreshTokenIsAvailable(
 287       signin_->GetAccountIdToUse());
 288 }
 289
 290 void ProfileSyncService::Initialize() {
 291   // We clear this here (vs Shutdown) because we want to remember that an error
 292   // happened on shutdown so we can display details (message, location) about it
 293   // in about:sync.
 294   ClearStaleErrors();
 295
 296   sync_prefs_.AddSyncPrefObserver(this);
 297
 298   // For now, the only thing we can do through policy is to turn sync off.
 299   if (IsManaged()) {
 300     DisableForUser();
 301     return;
 302   }
 303
 304   RegisterAuthNotifications();
 305
 306   if (!HasSyncSetupCompleted() || signin_->GetEffectiveUsername().empty()) {
 307     // Clean up in case of previous crash / setup abort / signout.
 308     DisableForUser();
 309   }
 310
 311   TrySyncDatatypePrefRecovery();
 312
 313   last_synced_time_ = sync_prefs_.GetLastSyncedTime();
 314
 315 #if defined(OS_CHROMEOS)
 316   std::string bootstrap_token = sync_prefs_.GetEncryptionBootstrapToken();
 317   if (bootstrap_token.empty()) {
 318     sync_prefs_.SetEncryptionBootstrapToken(
 319         sync_prefs_.GetSpareBootstrapToken());
 320   }
 321 #endif
 322
 323 #if !defined(OS_ANDROID)
 324   DCHECK(sync_error_controller_ == NULL)
 325       << "Initialize() called more than once.";
 326   sync_error_controller_.reset(new SyncErrorController(this));
 327   AddObserver(sync_error_controller_.get());
 328 #endif
 329
 330   bool running_rollback = false;
 331   if (browser_sync::BackupRollbackController::IsBackupEnabled()) {
 332     // Backup is needed if user's not signed in or signed in but previous
 333     // backup didn't finish, i.e. backend didn't switch from backup to sync.
 334     need_backup_ = signin_->GetEffectiveUsername().empty() ||
 335         sync_prefs_.GetFirstSyncTime().is_null();
 336
 337     // Try to resume rollback if it didn't finish in last session.
 338     running_rollback = backup_rollback_controller_.StartRollback();
 339   } else {
 340     need_backup_ = false;
 341   }
 342
 343 #if defined(ENABLE_PRE_SYNC_BACKUP)
 344   if (!running_rollback && signin_->GetEffectiveUsername().empty()) {
 345     CleanUpBackup();
 346   }
 347 #else
 348   DCHECK(!running_rollback);
 349 #endif
 350
 351   startup_controller_.Reset(GetRegisteredDataTypes());
 352   startup_controller_.TryStart();
 353 }
 354
 355 void ProfileSyncService::TrySyncDatatypePrefRecovery() {
 356   DCHECK(!backend_initialized());
 357   if (!HasSyncSetupCompleted())
 358     return;
 359
 360   // There was a bug where OnUserChoseDatatypes was not properly called on
 361   // configuration (see crbug.com/154940). We detect this by checking whether
 362   // kSyncKeepEverythingSynced has a default value. If so, and sync setup has
 363   // completed, it means sync was not properly configured, so we manually
 364   // set kSyncKeepEverythingSynced.
 365   PrefService* const pref_service = profile_->GetPrefs();
 366   if (!pref_service)
 367     return;
 368   if (GetPreferredDataTypes().Size() > 1)
 369     return;
 370
 371   const PrefService::Preference* keep_everything_synced =
 372       pref_service->FindPreference(
 373           sync_driver::prefs::kSyncKeepEverythingSynced);
 374   // This will be false if the preference was properly set or if it's controlled
 375   // by policy.
 376   if (!keep_everything_synced->IsDefaultValue())
 377     return;
 378
 379   // kSyncKeepEverythingSynced was not properly set. Set it and the preferred
 380   // types now, before we configure.
 381   UMA_HISTOGRAM_COUNTS("Sync.DatatypePrefRecovery", 1);
 382   sync_prefs_.SetKeepEverythingSynced(true);
 383   syncer::ModelTypeSet registered_types = GetRegisteredDataTypes();
 384 }
 385
 386 void ProfileSyncService::StartSyncingWithServer() {
 387   if (backend_)
 388     backend_->StartSyncingWithServer();
 389 }
 390
 391 void ProfileSyncService::RegisterAuthNotifications() {
 392   oauth2_token_service_->AddObserver(this);
 393   if (signin())
 394     signin()->AddObserver(this);
 395 }
 396
 397 void ProfileSyncService::UnregisterAuthNotifications() {
 398   if (signin())
 399     signin()->RemoveObserver(this);
 400   oauth2_token_service_->RemoveObserver(this);
 401 }
 402
 403 void ProfileSyncService::RegisterDataTypeController(
 404     DataTypeController* data_type_controller) {
 405   DCHECK_EQ(
 406       directory_data_type_controllers_.count(data_type_controller->type()),
 407       0U);
 408   DCHECK(!GetRegisteredNonBlockingDataTypes().Has(
 409       data_type_controller->type()));
 410   directory_data_type_controllers_[data_type_controller->type()] =
 411       data_type_controller;
 412 }
 413
 414 void ProfileSyncService::RegisterNonBlockingType(syncer::ModelType type) {
 415   DCHECK_EQ(directory_data_type_controllers_.count(type), 0U)
 416       << "Duplicate registration of type " << ModelTypeToString(type);
 417
 418   // TODO(rlarocque): Set the enable flag properly when crbug.com/368834 is
 419   // fixed and we have some way of telling whether or not this type should be
 420   // enabled.
 421   non_blocking_data_type_manager_.RegisterType(type, false);
 422 }
 423
 424 void ProfileSyncService::InitializeNonBlockingType(
 425     syncer::ModelType type,
 426     const scoped_refptr<base::SequencedTaskRunner>& task_runner,
 427     const base::WeakPtr<syncer::ModelTypeSyncProxyImpl>& type_sync_proxy) {
 428   non_blocking_data_type_manager_.InitializeType(
 429       type, task_runner, type_sync_proxy);
 430 }
 431
 432 bool ProfileSyncService::IsDataTypeControllerRunning(
 433     syncer::ModelType type) const {
 434   DataTypeController::TypeMap::const_iterator iter =
 435       directory_data_type_controllers_.find(type);
 436   if (iter == directory_data_type_controllers_.end()) {
 437     return false;
 438   }
 439   return iter->second->state() == DataTypeController::RUNNING;
 440 }
 441
 442 browser_sync::OpenTabsUIDelegate* ProfileSyncService::GetOpenTabsUIDelegate() {
 443   if (!IsDataTypeControllerRunning(syncer::SESSIONS))
 444     return NULL;
 445   return sessions_sync_manager_.get();
 446 }
 447
 448 browser_sync::FaviconCache* ProfileSyncService::GetFaviconCache() {
 449   return sessions_sync_manager_->GetFaviconCache();
 450 }
 451
 452 browser_sync::SyncedWindowDelegatesGetter*
 453 ProfileSyncService::GetSyncedWindowDelegatesGetter() const {
 454   return sessions_sync_manager_->GetSyncedWindowDelegatesGetter();
 455 }
 456
 457 sync_driver::DeviceInfoTracker* ProfileSyncService::GetDeviceInfoTracker()
 458     const {
 459   if (!IsDataTypeControllerRunning(syncer::DEVICE_INFO))
 460     return NULL;
 461
 462   return device_info_sync_service_.get();
 463 }
 464
 465 sync_driver::LocalDeviceInfoProvider*
 466 ProfileSyncService::GetLocalDeviceInfoProvider() {
 467   return local_device_.get();
 468 }
 469
 470 void ProfileSyncService::GetDataTypeControllerStates(
 471   DataTypeController::StateMap* state_map) const {
 472     for (DataTypeController::TypeMap::const_iterator iter =
 473          directory_data_type_controllers_.begin();
 474          iter != directory_data_type_controllers_.end();
 475          ++iter)
 476       (*state_map)[iter->first] = iter->second.get()->state();
 477 }
 478
 479 SyncCredentials ProfileSyncService::GetCredentials() {
 480   SyncCredentials credentials;
 481   if (backend_mode_ == SYNC) {
 482     credentials.email = signin_->GetEffectiveUsername();
 483     DCHECK(!credentials.email.empty());
 484     credentials.sync_token = access_token_;
 485
 486     if (credentials.sync_token.empty())
 487       credentials.sync_token = "credentials_lost";
 488
 489     credentials.scope_set.insert(signin_->GetSyncScopeToUse());
 490   }
 491
 492   return credentials;
 493 }
 494
 495 bool ProfileSyncService::ShouldDeleteSyncFolder() {
 496   switch (backend_mode_) {
 497     case SYNC:
 498       return !HasSyncSetupCompleted();
 499     case BACKUP:
 500       return true;
 501     case ROLLBACK:
 502       return false;
 503     case IDLE:
 504       NOTREACHED();
 505       return true;
 506   }
 507   return true;
 508 }
 509
 510 void ProfileSyncService::InitializeBackend(bool delete_stale_data) {
 511   if (!backend_) {
 512     NOTREACHED();
 513     return;
 514   }
 515
 516   SyncCredentials credentials = GetCredentials();
 517
 518   scoped_refptr<net::URLRequestContextGetter> request_context_getter(
 519       profile_->GetRequestContext());
 520
 521   if (backend_mode_ == SYNC && delete_stale_data)
 522     ClearStaleErrors();
 523
 524   scoped_ptr<syncer::UnrecoverableErrorHandler>
 525       backend_unrecoverable_error_handler(
 526           new browser_sync::BackendUnrecoverableErrorHandler(
 527               MakeWeakHandle(weak_factory_.GetWeakPtr())));
 528
 529   backend_->Initialize(
 530       this,
 531       sync_thread_.Pass(),
 532       GetJsEventHandler(),
 533       sync_service_url_,
 534       credentials,
 535       delete_stale_data,
 536       scoped_ptr<syncer::SyncManagerFactory>(
 537           new syncer::SyncManagerFactory(GetManagerType())).Pass(),
 538       backend_unrecoverable_error_handler.Pass(),
 539       &browser_sync::ChromeReportUnrecoverableError,
 540       network_resources_.get());
 541 }
 542
 543 bool ProfileSyncService::IsEncryptedDatatypeEnabled() const {
 544   if (encryption_pending())
 545     return true;
 546   const syncer::ModelTypeSet preferred_types = GetPreferredDataTypes();
 547   const syncer::ModelTypeSet encrypted_types = GetEncryptedDataTypes();
 548   DCHECK(encrypted_types.Has(syncer::PASSWORDS));
 549   return !Intersection(preferred_types, encrypted_types).Empty();
 550 }
 551
 552 void ProfileSyncService::OnProtocolEvent(
 553     const syncer::ProtocolEvent& event) {
 554   FOR_EACH_OBSERVER(browser_sync::ProtocolEventObserver,
 555                     protocol_event_observers_,
 556                     OnProtocolEvent(event));
 557 }
 558
 559 void ProfileSyncService::OnDirectoryTypeCommitCounterUpdated(
 560     syncer::ModelType type,
 561     const syncer::CommitCounters& counters) {
 562   FOR_EACH_OBSERVER(syncer::TypeDebugInfoObserver,
 563                     type_debug_info_observers_,
 564                     OnCommitCountersUpdated(type, counters));
 565 }
 566
 567 void ProfileSyncService::OnDirectoryTypeUpdateCounterUpdated(
 568     syncer::ModelType type,
 569     const syncer::UpdateCounters& counters) {
 570   FOR_EACH_OBSERVER(syncer::TypeDebugInfoObserver,
 571                     type_debug_info_observers_,
 572                     OnUpdateCountersUpdated(type, counters));
 573 }
 574
 575 void ProfileSyncService::OnDirectoryTypeStatusCounterUpdated(
 576     syncer::ModelType type,
 577     const syncer::StatusCounters& counters) {
 578   FOR_EACH_OBSERVER(syncer::TypeDebugInfoObserver,
 579                     type_debug_info_observers_,
 580                     OnStatusCountersUpdated(type, counters));
 581 }
 582
 583 void ProfileSyncService::OnDataTypeRequestsSyncStartup(
 584     syncer::ModelType type) {
 585   DCHECK(syncer::UserTypes().Has(type));
 586   if (backend_.get()) {
 587     DVLOG(1) << "A data type requested sync startup, but it looks like "
 588                 "something else beat it to the punch.";
 589     return;
 590   }
 591
 592   if (!GetPreferredDataTypes().Has(type)) {
 593     // We can get here as datatype SyncableServices are typically wired up
 594     // to the native datatype even if sync isn't enabled.
 595     DVLOG(1) << "Dropping sync startup request because type "
 596              << syncer::ModelTypeToString(type) << "not enabled.";
 597     return;
 598   }
 599
 600   startup_controller_.OnDataTypeRequestsSyncStartup(type);
 601 }
 602
 603 void ProfileSyncService::StartUpSlowBackendComponents(
 604     ProfileSyncService::BackendMode mode) {
 605   DCHECK_NE(IDLE, mode);
 606   if (backend_mode_ == mode) {
 607     return;
 608   }
 609
 610   // Backend mode transition rules:
 611   // * can transit from IDLE to any other non-IDLE mode.
 612   // * forbidden to transit from SYNC to any other mode, i.e. SYNC backend must
 613   //   be explicitly shut down before backup/rollback starts.
 614   // * can not transit out of ROLLBACK mode until rollback is finished
 615   //   (successfully or unsuccessfully).
 616   // * can not transit out of BACKUP mode until backup is finished
 617   //   (successfully or unsuccessfully).
 618   // * if backup is needed, can only transit to SYNC if backup is finished,
 619
 620   if (backend_mode_ == SYNC) {
 621     LOG(DFATAL) << "Shouldn't switch from mode SYNC to mode " << mode;
 622     return;
 623   }
 624
 625   if (backend_mode_ == ROLLBACK ||
 626       (backend_mode_ == BACKUP && !backup_finished_)) {
 627     // Wait for rollback/backup to finish before start new backend.
 628     return;
 629   }
 630
 631   if (mode == SYNC && NeedBackup() && !backup_finished_) {
 632     if (backend_mode_ != BACKUP)
 633       backup_rollback_controller_.StartBackup();
 634     return;
 635   }
 636
 637   DVLOG(1) << "Start backend mode: " << mode;
 638
 639   if (backend_) {
 640     if (mode == SYNC)
 641       ShutdownImpl(syncer::SWITCH_MODE_SYNC);
 642     else
 643       ShutdownImpl(syncer::STOP_SYNC);
 644   }
 645
 646   backend_mode_ = mode;
 647
 648   if (backend_mode_ == BACKUP)
 649     backup_start_time_ = base::Time::Now();
 650
 651   if (backend_mode_ == SYNC && !backup_start_time_.is_null()) {
 652     UMA_HISTOGRAM_MEDIUM_TIMES("Sync.FirstSyncDelayByBackup",
 653                                base::Time::Now() - backup_start_time_);
 654     backup_start_time_ = base::Time();
 655   }
 656
 657   if (backend_mode_ == ROLLBACK)
 658     ClearBrowsingDataSinceFirstSync();
 659   else if (backend_mode_ == SYNC)
 660     CheckSyncBackupIfNeeded();
 661
 662   base::FilePath sync_folder = backend_mode_ == SYNC ?
 663       base::FilePath(kSyncDataFolderName) :
 664       base::FilePath(kSyncBackupDataFolderName);
 665
 666   invalidation::InvalidationService* invalidator = NULL;
 667   if (backend_mode_ == SYNC) {
 668     invalidation::ProfileInvalidationProvider* provider =
 669         invalidation::ProfileInvalidationProviderFactory::GetForProfile(
 670             profile_);
 671     if (provider)
 672       invalidator = provider->GetInvalidationService();
 673   }
 674
 675   backend_.reset(
 676       factory_->CreateSyncBackendHost(
 677           profile_->GetDebugName(),
 678           profile_,
 679           invalidator,
 680           sync_prefs_.AsWeakPtr(),
 681           sync_folder));
 682
 683   // Initialize the backend.  Every time we start up a new SyncBackendHost,
 684   // we'll want to start from a fresh SyncDB, so delete any old one that might
 685   // be there.
 686   InitializeBackend(ShouldDeleteSyncFolder());
 687
 688   UpdateFirstSyncTimePref();
 689 }
 690
 691 void ProfileSyncService::OnGetTokenSuccess(
 692     const OAuth2TokenService::Request* request,
 693     const std::string& access_token,
 694     const base::Time& expiration_time) {
 695   DCHECK_EQ(access_token_request_, request);
 696   access_token_request_.reset();
 697   access_token_ = access_token;
 698   token_receive_time_ = base::Time::Now();
 699   last_get_token_error_ = GoogleServiceAuthError::AuthErrorNone();
 700
 701   if (sync_prefs_.SyncHasAuthError()) {
 702     sync_prefs_.SetSyncAuthError(false);
 703     UMA_HISTOGRAM_ENUMERATION("Sync.SyncAuthError",
 704                               AUTH_ERROR_FIXED,
 705                               AUTH_ERROR_LIMIT);
 706   }
 707
 708   if (HasSyncingBackend())
 709     backend_->UpdateCredentials(GetCredentials());
 710   else
 711     startup_controller_.TryStart();
 712 }
 713
 714 void ProfileSyncService::OnGetTokenFailure(
 715     const OAuth2TokenService::Request* request,
 716     const GoogleServiceAuthError& error) {
 717   DCHECK_EQ(access_token_request_, request);
 718   DCHECK_NE(error.state(), GoogleServiceAuthError::NONE);
 719   access_token_request_.reset();
 720   last_get_token_error_ = error;
 721   switch (error.state()) {
 722     case GoogleServiceAuthError::CONNECTION_FAILED:
 723     case GoogleServiceAuthError::REQUEST_CANCELED:
 724     case GoogleServiceAuthError::SERVICE_ERROR:
 725     case GoogleServiceAuthError::SERVICE_UNAVAILABLE: {
 726       // Transient error. Retry after some time.
 727       request_access_token_backoff_.InformOfRequest(false);
 728       next_token_request_time_ = base::Time::Now() +
 729           request_access_token_backoff_.GetTimeUntilRelease();
 730       request_access_token_retry_timer_.Start(
 731             FROM_HERE,
 732             request_access_token_backoff_.GetTimeUntilRelease(),
 733             base::Bind(&ProfileSyncService::RequestAccessToken,
 734                         weak_factory_.GetWeakPtr()));
 735       NotifyObservers();
 736       break;
 737     }
 738     case GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS: {
 739       if (!sync_prefs_.SyncHasAuthError()) {
 740         sync_prefs_.SetSyncAuthError(true);
 741         UMA_HISTOGRAM_ENUMERATION("Sync.SyncAuthError",
 742                                   AUTH_ERROR_ENCOUNTERED,
 743                                   AUTH_ERROR_LIMIT);
 744       }
 745       // Fallthrough.
 746     }
 747     default: {
 748       if (error.state() != GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS) {
 749         LOG(ERROR) << "Unexpected persistent error: " << error.ToString();
 750       }
 751       // Show error to user.
 752       UpdateAuthErrorState(error);
 753     }
 754   }
 755 }
 756
 757 void ProfileSyncService::OnRefreshTokenAvailable(
 758     const std::string& account_id) {
 759   // TODO(vadimt): Remove ScopedProfile below once crbug.com/422460 is fixed.
 760   tracked_objects::ScopedProfile tracking_profile(
 761       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 762           "422460 ProfileSyncService::OnRefreshTokenAvailable"));
 763
 764   if (account_id == signin_->GetAccountIdToUse())
 765     OnRefreshTokensLoaded();
 766 }
 767
 768 void ProfileSyncService::OnRefreshTokenRevoked(
 769     const std::string& account_id) {
 770   if (!IsOAuthRefreshTokenAvailable()) {
 771     access_token_.clear();
 772     // The additional check around IsOAuthRefreshTokenAvailable() above
 773     // prevents us sounding the alarm if we actually have a valid token but
 774     // a refresh attempt failed for any variety of reasons
 775     // (e.g. flaky network). It's possible the token we do have is also
 776     // invalid, but in that case we should already have (or can expect) an
 777     // auth error sent from the sync backend.
 778     UpdateAuthErrorState(
 779         GoogleServiceAuthError(GoogleServiceAuthError::REQUEST_CANCELED));
 780   }
 781 }
 782
 783 void ProfileSyncService::OnRefreshTokensLoaded() {
 784   // This notification gets fired when OAuth2TokenService loads the tokens
 785   // from storage.
 786   // Initialize the backend if sync is enabled. If the sync token was
 787   // not loaded, GetCredentials() will generate invalid credentials to
 788   // cause the backend to generate an auth error (crbug.com/121755).
 789   if (HasSyncingBackend()) {
 790     RequestAccessToken();
 791   } else {
 792     startup_controller_.TryStart();
 793   }
 794 }
 795
 796 void ProfileSyncService::Shutdown() {
 797   UnregisterAuthNotifications();
 798
 799   ShutdownImpl(syncer::BROWSER_SHUTDOWN);
 800   if (sync_error_controller_) {
 801     // Destroy the SyncErrorController when the service shuts down for good.
 802     RemoveObserver(sync_error_controller_.get());
 803     sync_error_controller_.reset();
 804   }
 805
 806   if (sync_thread_)
 807     sync_thread_->Stop();
 808 }
 809
 810 void ProfileSyncService::ShutdownImpl(syncer::ShutdownReason reason) {
 811   if (!backend_)
 812     return;
 813
 814   non_blocking_data_type_manager_.DisconnectSyncBackend();
 815
 816   // First, we spin down the backend to stop change processing as soon as
 817   // possible.
 818   base::Time shutdown_start_time = base::Time::Now();
 819   backend_->StopSyncingForShutdown();
 820
 821   // Stop all data type controllers, if needed.  Note that until Stop
 822   // completes, it is possible in theory to have a ChangeProcessor apply a
 823   // change from a native model.  In that case, it will get applied to the sync
 824   // database (which doesn't get destroyed until we destroy the backend below)
 825   // as an unsynced change.  That will be persisted, and committed on restart.
 826   if (directory_data_type_manager_) {
 827     if (directory_data_type_manager_->state() != DataTypeManager::STOPPED) {
 828       // When aborting as part of shutdown, we should expect an aborted sync
 829       // configure result, else we'll dcheck when we try to read the sync error.
 830       expect_sync_configuration_aborted_ = true;
 831       directory_data_type_manager_->Stop();
 832     }
 833     directory_data_type_manager_.reset();
 834   }
 835
 836   // Shutdown the migrator before the backend to ensure it doesn't pull a null
 837   // snapshot.
 838   migrator_.reset();
 839   sync_js_controller_.AttachJsBackend(WeakHandle<syncer::JsBackend>());
 840
 841   // Move aside the backend so nobody else tries to use it while we are
 842   // shutting it down.
 843   scoped_ptr<SyncBackendHost> doomed_backend(backend_.release());
 844   if (doomed_backend) {
 845     sync_thread_ = doomed_backend->Shutdown(reason);
 846     doomed_backend.reset();
 847   }
 848   base::TimeDelta shutdown_time = base::Time::Now() - shutdown_start_time;
 849   UMA_HISTOGRAM_TIMES("Sync.Shutdown.BackendDestroyedTime", shutdown_time);
 850
 851   weak_factory_.InvalidateWeakPtrs();
 852
 853   if (backend_mode_ == SYNC)
 854     startup_controller_.Reset(GetRegisteredDataTypes());
 855
 856   // Don't let backup block sync regardless backup succeeded or not.
 857   if (backend_mode_ == BACKUP)
 858     backup_finished_ = true;
 859
 860   // Sync could be blocked by rollback/backup. Post task to check whether sync
 861   // should start after shutting down rollback/backup backend.
 862   if ((backend_mode_ == ROLLBACK || backend_mode_ == BACKUP) &&
 863       reason != syncer::SWITCH_MODE_SYNC &&
 864       reason != syncer::BROWSER_SHUTDOWN) {
 865     base::MessageLoop::current()->PostTask(
 866         FROM_HERE, base::Bind(&ProfileSyncService::TryStartSyncAfterBackup,
 867                               startup_controller_weak_factory_.GetWeakPtr()));
 868   }
 869
 870   // Clear various flags.
 871   backend_mode_ = IDLE;
 872   expect_sync_configuration_aborted_ = false;
 873   is_auth_in_progress_ = false;
 874   backend_initialized_ = false;
 875   cached_passphrase_.clear();
 876   access_token_.clear();
 877   encryption_pending_ = false;
 878   encrypt_everything_ = false;
 879   encrypted_types_ = syncer::SyncEncryptionHandler::SensitiveTypes();
 880   passphrase_required_reason_ = syncer::REASON_PASSPHRASE_NOT_REQUIRED;
 881   request_access_token_retry_timer_.Stop();
 882   // Revert to "no auth error".
 883   if (last_auth_error_.state() != GoogleServiceAuthError::NONE)
 884     UpdateAuthErrorState(GoogleServiceAuthError::AuthErrorNone());
 885
 886   NotifyObservers();
 887 }
 888
 889 void ProfileSyncService::DisableForUser() {
 890   // Clear prefs (including SyncSetupHasCompleted) before shutting down so
 891   // PSS clients don't think we're set up while we're shutting down.
 892   sync_prefs_.ClearPreferences();
 893   ClearUnrecoverableError();
 894   ShutdownImpl(syncer::DISABLE_SYNC);
 895 }
 896
 897 bool ProfileSyncService::HasSyncSetupCompleted() const {
 898   return sync_prefs_.HasSyncSetupCompleted();
 899 }
 900
 901 void ProfileSyncService::SetSyncSetupCompleted() {
 902   sync_prefs_.SetSyncSetupCompleted();
 903 }
 904
 905 void ProfileSyncService::UpdateLastSyncedTime() {
 906   last_synced_time_ = base::Time::Now();
 907   sync_prefs_.SetLastSyncedTime(last_synced_time_);
 908 }
 909
 910 void ProfileSyncService::NotifyObservers() {
 911   FOR_EACH_OBSERVER(ProfileSyncServiceBase::Observer, observers_,
 912                     OnStateChanged());
 913 }
 914
 915 void ProfileSyncService::NotifySyncCycleCompleted() {
 916   FOR_EACH_OBSERVER(ProfileSyncServiceBase::Observer, observers_,
 917                     OnSyncCycleCompleted());
 918 }
 919
 920 void ProfileSyncService::ClearStaleErrors() {
 921   ClearUnrecoverableError();
 922   last_actionable_error_ = SyncProtocolError();
 923   // Clear the data type errors as well.
 924   if (directory_data_type_manager_.get())
 925     directory_data_type_manager_->ResetDataTypeErrors();
 926
 927 }
 928
 929 void ProfileSyncService::ClearUnrecoverableError() {
 930   unrecoverable_error_reason_ = ERROR_REASON_UNSET;
 931   unrecoverable_error_message_.clear();
 932   unrecoverable_error_location_ = tracked_objects::Location();
 933 }
 934
 935 void ProfileSyncService::RegisterNewDataType(syncer::ModelType data_type) {
 936   if (directory_data_type_controllers_.count(data_type) > 0)
 937     return;
 938   NOTREACHED();
 939 }
 940
 941 // An invariant has been violated.  Transition to an error state where we try
 942 // to do as little work as possible, to avoid further corruption or crashes.
 943 void ProfileSyncService::OnUnrecoverableError(
 944     const tracked_objects::Location& from_here,
 945     const std::string& message) {
 946   // Unrecoverable errors that arrive via the syncer::UnrecoverableErrorHandler
 947   // interface are assumed to originate within the syncer.
 948   unrecoverable_error_reason_ = ERROR_REASON_SYNCER;
 949   OnUnrecoverableErrorImpl(from_here, message, true);
 950 }
 951
 952 void ProfileSyncService::OnUnrecoverableErrorImpl(
 953     const tracked_objects::Location& from_here,
 954     const std::string& message,
 955     bool delete_sync_database) {
 956   DCHECK(HasUnrecoverableError());
 957   unrecoverable_error_message_ = message;
 958   unrecoverable_error_location_ = from_here;
 959
 960   UMA_HISTOGRAM_ENUMERATION(kSyncUnrecoverableErrorHistogram,
 961                             unrecoverable_error_reason_,
 962                             ERROR_REASON_LIMIT);
 963   std::string location;
 964   from_here.Write(true, true, &location);
 965   LOG(ERROR)
 966       << "Unrecoverable error detected at " << location
 967       << " -- ProfileSyncService unusable: " << message;
 968
 969   // Shut all data types down.
 970   base::MessageLoop::current()->PostTask(FROM_HERE,
 971       base::Bind(&ProfileSyncService::ShutdownImpl,
 972                  weak_factory_.GetWeakPtr(),
 973                  delete_sync_database ?
 974                      syncer::DISABLE_SYNC : syncer::STOP_SYNC));
 975 }
 976
 977 void ProfileSyncService::ReenableDatatype(syncer::ModelType type) {
 978   DCHECK(backend_initialized_);
 979   directory_data_type_manager_->ReenableType(type);
 980 }
 981
 982 void ProfileSyncService::UpdateBackendInitUMA(bool success) {
 983   if (backend_mode_ != SYNC)
 984     return;
 985
 986   is_first_time_sync_configure_ = !HasSyncSetupCompleted();
 987
 988   if (is_first_time_sync_configure_) {
 989     UMA_HISTOGRAM_BOOLEAN("Sync.BackendInitializeFirstTimeSuccess", success);
 990   } else {
 991     UMA_HISTOGRAM_BOOLEAN("Sync.BackendInitializeRestoreSuccess", success);
 992   }
 993
 994   base::Time on_backend_initialized_time = base::Time::Now();
 995   base::TimeDelta delta = on_backend_initialized_time -
 996       startup_controller_.start_backend_time();
 997   if (is_first_time_sync_configure_) {
 998     UMA_HISTOGRAM_LONG_TIMES("Sync.BackendInitializeFirstTime", delta);
 999   } else {
1000     UMA_HISTOGRAM_LONG_TIMES("Sync.BackendInitializeRestoreTime", delta);
1001   }
1002 }
1003
1004 void ProfileSyncService::PostBackendInitialization() {
1005   // Never get here for backup / restore.
1006   DCHECK_EQ(backend_mode_, SYNC);
1007
1008   if (last_backup_time_) {
1009     DCHECK(device_info_sync_service_);
1010     device_info_sync_service_->UpdateLocalDeviceBackupTime(*last_backup_time_);
1011   }
1012
1013   if (protocol_event_observers_.might_have_observers()) {
1014     backend_->RequestBufferedProtocolEventsAndEnableForwarding();
1015   }
1016
1017   non_blocking_data_type_manager_.ConnectSyncBackend(
1018       backend_->GetSyncContextProxy());
1019
1020   if (type_debug_info_observers_.might_have_observers()) {
1021     backend_->EnableDirectoryTypeDebugInfoForwarding();
1022   }
1023
1024   // If we have a cached passphrase use it to decrypt/encrypt data now that the
1025   // backend is initialized. We want to call this before notifying observers in
1026   // case this operation affects the "passphrase required" status.
1027   ConsumeCachedPassphraseIfPossible();
1028
1029   // The very first time the backend initializes is effectively the first time
1030   // we can say we successfully "synced".  last_synced_time_ will only be null
1031   // in this case, because the pref wasn't restored on StartUp.
1032   if (last_synced_time_.is_null()) {
1033     UpdateLastSyncedTime();
1034   }
1035
1036   if (startup_controller_.auto_start_enabled() && !FirstSetupInProgress()) {
1037     // Backend is initialized but we're not in sync setup, so this must be an
1038     // autostart - mark our sync setup as completed and we'll start syncing
1039     // below.
1040     SetSyncSetupCompleted();
1041   }
1042
1043   // Check HasSyncSetupCompleted() before NotifyObservers() to avoid spurious
1044   // data type configuration because observer may flag setup as complete and
1045   // trigger data type configuration.
1046   if (HasSyncSetupCompleted()) {
1047     ConfigureDataTypeManager();
1048   } else {
1049     DCHECK(FirstSetupInProgress());
1050   }
1051
1052   NotifyObservers();
1053 }
1054
1055 void ProfileSyncService::OnBackendInitialized(
1056     const syncer::WeakHandle<syncer::JsBackend>& js_backend,
1057     const syncer::WeakHandle<syncer::DataTypeDebugInfoListener>&
1058         debug_info_listener,
1059     const std::string& cache_guid,
1060     bool success) {
1061   UpdateBackendInitUMA(success);
1062
1063   if (!success) {
1064     // Something went unexpectedly wrong.  Play it safe: stop syncing at once
1065     // and surface error UI to alert the user sync has stopped.
1066     // Keep the directory around for now so that on restart we will retry
1067     // again and potentially succeed in presence of transient file IO failures
1068     // or permissions issues, etc.
1069     //
1070     // TODO(rlarocque): Consider making this UnrecoverableError less special.
1071     // Unlike every other UnrecoverableError, it does not delete our sync data.
1072     // This exception made sense at the time it was implemented, but our new
1073     // directory corruption recovery mechanism makes it obsolete.  By the time
1074     // we get here, we will have already tried and failed to delete the
1075     // directory.  It would be no big deal if we tried to delete it again.
1076     OnInternalUnrecoverableError(FROM_HERE,
1077                                  "BackendInitialize failure",
1078                                  false,
1079                                  ERROR_REASON_BACKEND_INIT_FAILURE);
1080     return;
1081   }
1082
1083   backend_initialized_ = true;
1084
1085   sync_js_controller_.AttachJsBackend(js_backend);
1086   debug_info_listener_ = debug_info_listener;
1087
1088   SigninClient* signin_client =
1089       ChromeSigninClientFactory::GetForProfile(profile_);
1090   DCHECK(signin_client);
1091   std::string signin_scoped_device_id =
1092       signin_client->GetSigninScopedDeviceId();
1093
1094   // Initialize local device info.
1095   local_device_->Initialize(cache_guid, signin_scoped_device_id);
1096
1097   DVLOG(1) << "Setting preferred types for non-blocking DTM";
1098   non_blocking_data_type_manager_.SetPreferredTypes(GetPreferredDataTypes());
1099
1100   // Give the DataTypeControllers a handle to the now initialized backend
1101   // as a UserShare.
1102   for (DataTypeController::TypeMap::iterator it =
1103        directory_data_type_controllers_.begin();
1104        it != directory_data_type_controllers_.end(); ++it) {
1105     it->second->OnUserShareReady(GetUserShare());
1106   }
1107
1108   if (backend_mode_ == BACKUP || backend_mode_ == ROLLBACK)
1109     ConfigureDataTypeManager();
1110   else
1111     PostBackendInitialization();
1112 }
1113
1114 void ProfileSyncService::OnSyncCycleCompleted() {
1115   UpdateLastSyncedTime();
1116   if (IsDataTypeControllerRunning(syncer::SESSIONS)) {
1117     // Trigger garbage collection of old sessions now that we've downloaded
1118     // any new session data.
1119     base::MessageLoop::current()->PostTask(FROM_HERE, base::Bind(
1120         &SessionsSyncManager::DoGarbageCollection,
1121             base::AsWeakPtr(sessions_sync_manager_.get())));
1122   }
1123   DVLOG(2) << "Notifying observers sync cycle completed";
1124   NotifySyncCycleCompleted();
1125 }
1126
1127 void ProfileSyncService::OnExperimentsChanged(
1128     const syncer::Experiments& experiments) {
1129   if (current_experiments_.Matches(experiments))
1130     return;
1131
1132   current_experiments_ = experiments;
1133
1134   // Handle preference-backed experiments first.
1135   if (experiments.gcm_channel_state == syncer::Experiments::SUPPRESSED) {
1136     profile()->GetPrefs()->SetBoolean(prefs::kGCMChannelEnabled, false);
1137     gcm::GCMProfileServiceFactory::GetForProfile(profile())->driver()
1138         ->Disable();
1139   } else {
1140     profile()->GetPrefs()->ClearPref(prefs::kGCMChannelEnabled);
1141     gcm::GCMProfileServiceFactory::GetForProfile(profile())->driver()
1142         ->Enable();
1143   }
1144
1145   profile()->GetPrefs()->SetBoolean(prefs::kInvalidationServiceUseGCMChannel,
1146                                     experiments.gcm_invalidations_enabled);
1147
1148   if (experiments.enhanced_bookmarks_enabled) {
1149     profile_->GetPrefs()->SetString(
1150         sync_driver::prefs::kEnhancedBookmarksExtensionId,
1151         experiments.enhanced_bookmarks_ext_id);
1152   } else {
1153     profile_->GetPrefs()->ClearPref(
1154         sync_driver::prefs::kEnhancedBookmarksExtensionId);
1155   }
1156   UpdateBookmarksExperimentState(
1157       profile_->GetPrefs(), g_browser_process->local_state(), true,
1158       experiments.enhanced_bookmarks_enabled ? BOOKMARKS_EXPERIMENT_ENABLED :
1159                                                BOOKMARKS_EXPERIMENT_NONE);
1160
1161   // If this is a first time sync for a client, this will be called before
1162   // OnBackendInitialized() to ensure the new datatypes are available at sync
1163   // setup. As a result, the migrator won't exist yet. This is fine because for
1164   // first time sync cases we're only concerned with making the datatype
1165   // available.
1166   if (migrator_.get() &&
1167       migrator_->state() != browser_sync::BackendMigrator::IDLE) {
1168     DVLOG(1) << "Dropping OnExperimentsChanged due to migrator busy.";
1169     return;
1170   }
1171
1172   const syncer::ModelTypeSet registered_types = GetRegisteredDataTypes();
1173   syncer::ModelTypeSet to_add;
1174   const syncer::ModelTypeSet to_register =
1175       Difference(to_add, registered_types);
1176   DVLOG(2) << "OnExperimentsChanged called with types: "
1177            << syncer::ModelTypeSetToString(to_add);
1178   DVLOG(2) << "Enabling types: " << syncer::ModelTypeSetToString(to_register);
1179
1180   for (syncer::ModelTypeSet::Iterator it = to_register.First();
1181        it.Good(); it.Inc()) {
1182     // Received notice to enable experimental type. Check if the type is
1183     // registered, and if not register a new datatype controller.
1184     RegisterNewDataType(it.Get());
1185   }
1186
1187   // Check if the user has "Keep Everything Synced" enabled. If so, we want
1188   // to turn on all experimental types if they're not already on. Otherwise we
1189   // leave them off.
1190   // Note: if any types are already registered, we don't turn them on. This
1191   // covers the case where we're already in the process of reconfiguring
1192   // to turn an experimental type on.
1193   if (sync_prefs_.HasKeepEverythingSynced()) {
1194     // Mark all data types as preferred.
1195     sync_prefs_.SetPreferredDataTypes(registered_types, registered_types);
1196
1197     // Only automatically turn on types if we have already finished set up.
1198     // Otherwise, just leave the experimental types on by default.
1199     if (!to_register.Empty() && HasSyncSetupCompleted() && migrator_) {
1200       DVLOG(1) << "Dynamically enabling new datatypes: "
1201                << syncer::ModelTypeSetToString(to_register);
1202       OnMigrationNeededForTypes(to_register);
1203     }
1204   }
1205 }
1206
1207 void ProfileSyncService::UpdateAuthErrorState(const AuthError& error) {
1208   is_auth_in_progress_ = false;
1209   last_auth_error_ = error;
1210
1211   NotifyObservers();
1212 }
1213
1214 namespace {
1215
1216 AuthError ConnectionStatusToAuthError(
1217     syncer::ConnectionStatus status) {
1218   switch (status) {
1219     case syncer::CONNECTION_OK:
1220       return AuthError::AuthErrorNone();
1221       break;
1222     case syncer::CONNECTION_AUTH_ERROR:
1223       return AuthError(AuthError::INVALID_GAIA_CREDENTIALS);
1224       break;
1225     case syncer::CONNECTION_SERVER_ERROR:
1226       return AuthError(AuthError::CONNECTION_FAILED);
1227       break;
1228     default:
1229       NOTREACHED();
1230       return AuthError(AuthError::CONNECTION_FAILED);
1231   }
1232 }
1233
1234 }  // namespace
1235
1236 void ProfileSyncService::OnConnectionStatusChange(
1237     syncer::ConnectionStatus status) {
1238   connection_status_update_time_ = base::Time::Now();
1239   connection_status_ = status;
1240   if (status == syncer::CONNECTION_AUTH_ERROR) {
1241     // Sync server returned error indicating that access token is invalid. It
1242     // could be either expired or access is revoked. Let's request another
1243     // access token and if access is revoked then request for token will fail
1244     // with corresponding error. If access token is repeatedly reported
1245     // invalid, there may be some issues with server, e.g. authentication
1246     // state is inconsistent on sync and token server. In that case, we
1247     // backoff token requests exponentially to avoid hammering token server
1248     // too much and to avoid getting same token due to token server's caching
1249     // policy. |request_access_token_retry_timer_| is used to backoff request
1250     // triggered by both auth error and failure talking to GAIA server.
1251     // Therefore, we're likely to reach the backoff ceiling more quickly than
1252     // you would expect from looking at the BackoffPolicy if both types of
1253     // errors happen. We shouldn't receive two errors back-to-back without
1254     // attempting a token/sync request in between, thus crank up request delay
1255     // unnecessary. This is because we won't make a sync request if we hit an
1256     // error until GAIA succeeds at sending a new token, and we won't request
1257     // a new token unless sync reports a token failure. But to be safe, don't
1258     // schedule request if this happens.
1259     if (request_access_token_retry_timer_.IsRunning()) {
1260       NOTREACHED();
1261     } else if (request_access_token_backoff_.failure_count() == 0) {
1262       // First time request without delay. Currently invalid token is used
1263       // to initialize sync backend and we'll always end up here. We don't
1264       // want to delay initialization.
1265       request_access_token_backoff_.InformOfRequest(false);
1266       RequestAccessToken();
1267     } else  {
1268       request_access_token_backoff_.InformOfRequest(false);
1269       request_access_token_retry_timer_.Start(
1270           FROM_HERE,
1271           request_access_token_backoff_.GetTimeUntilRelease(),
1272           base::Bind(&ProfileSyncService::RequestAccessToken,
1273                      weak_factory_.GetWeakPtr()));
1274     }
1275   } else {
1276     // Reset backoff time after successful connection.
1277     if (status == syncer::CONNECTION_OK) {
1278       // Request shouldn't be scheduled at this time. But if it is, it's
1279       // possible that sync flips between OK and auth error states rapidly,
1280       // thus hammers token server. To be safe, only reset backoff delay when
1281       // no scheduled request.
1282       if (request_access_token_retry_timer_.IsRunning()) {
1283         NOTREACHED();
1284       } else {
1285         request_access_token_backoff_.Reset();
1286       }
1287     }
1288
1289     const GoogleServiceAuthError auth_error =
1290         ConnectionStatusToAuthError(status);
1291     DVLOG(1) << "Connection status change: " << auth_error.ToString();
1292     UpdateAuthErrorState(auth_error);
1293   }
1294 }
1295
1296 void ProfileSyncService::StopSyncingPermanently() {
1297   sync_prefs_.SetStartSuppressed(true);
1298   DisableForUser();
1299 }
1300
1301 void ProfileSyncService::OnPassphraseRequired(
1302     syncer::PassphraseRequiredReason reason,
1303     const sync_pb::EncryptedData& pending_keys) {
1304   DCHECK(backend_.get());
1305   DCHECK(backend_->IsNigoriEnabled());
1306
1307   // TODO(lipalani) : add this check to other locations as well.
1308   if (HasUnrecoverableError()) {
1309     // When unrecoverable error is detected we post a task to shutdown the
1310     // backend. The task might not have executed yet.
1311     return;
1312   }
1313
1314   DVLOG(1) << "Passphrase required with reason: "
1315            << syncer::PassphraseRequiredReasonToString(reason);
1316   passphrase_required_reason_ = reason;
1317
1318   const syncer::ModelTypeSet types = GetPreferredDirectoryDataTypes();
1319   if (directory_data_type_manager_) {
1320     // Reconfigure without the encrypted types (excluded implicitly via the
1321     // failed datatypes handler).
1322     directory_data_type_manager_->Configure(types,
1323                                             syncer::CONFIGURE_REASON_CRYPTO);
1324   }
1325
1326   // TODO(rlarocque): Support non-blocking types.  http://crbug.com/351005.
1327
1328   // Notify observers that the passphrase status may have changed.
1329   NotifyObservers();
1330 }
1331
1332 void ProfileSyncService::OnPassphraseAccepted() {
1333   DVLOG(1) << "Received OnPassphraseAccepted.";
1334
1335   // If the pending keys were resolved via keystore, it's possible we never
1336   // consumed our cached passphrase. Clear it now.
1337   if (!cached_passphrase_.empty())
1338     cached_passphrase_.clear();
1339
1340   // Reset passphrase_required_reason_ since we know we no longer require the
1341   // passphrase. We do this here rather than down in ResolvePassphraseRequired()
1342   // because that can be called by OnPassphraseRequired() if no encrypted data
1343   // types are enabled, and we don't want to clobber the true passphrase error.
1344   passphrase_required_reason_ = syncer::REASON_PASSPHRASE_NOT_REQUIRED;
1345
1346   // Make sure the data types that depend on the passphrase are started at
1347   // this time.
1348   const syncer::ModelTypeSet types = GetPreferredDirectoryDataTypes();
1349   if (directory_data_type_manager_) {
1350     // Re-enable any encrypted types if necessary.
1351     directory_data_type_manager_->Configure(types,
1352                                             syncer::CONFIGURE_REASON_CRYPTO);
1353   }
1354
1355   // TODO(rlarocque): Support non-blocking types.  http://crbug.com/351005.
1356
1357   NotifyObservers();
1358 }
1359
1360 void ProfileSyncService::OnEncryptedTypesChanged(
1361     syncer::ModelTypeSet encrypted_types,
1362     bool encrypt_everything) {
1363   encrypted_types_ = encrypted_types;
1364   encrypt_everything_ = encrypt_everything;
1365   DVLOG(1) << "Encrypted types changed to "
1366            << syncer::ModelTypeSetToString(encrypted_types_)
1367            << " (encrypt everything is set to "
1368            << (encrypt_everything_ ? "true" : "false") << ")";
1369   DCHECK(encrypted_types_.Has(syncer::PASSWORDS));
1370
1371   NotifyObservers();
1372 }
1373
1374 void ProfileSyncService::OnEncryptionComplete() {
1375   DVLOG(1) << "Encryption complete";
1376   if (encryption_pending_ && encrypt_everything_) {
1377     encryption_pending_ = false;
1378     // This is to nudge the integration tests when encryption is
1379     // finished.
1380     NotifyObservers();
1381   }
1382 }
1383
1384 void ProfileSyncService::OnMigrationNeededForTypes(
1385     syncer::ModelTypeSet types) {
1386   DCHECK(backend_initialized_);
1387   DCHECK(directory_data_type_manager_.get());
1388
1389   // Migrator must be valid, because we don't sync until it is created and this
1390   // callback originates from a sync cycle.
1391   migrator_->MigrateTypes(types);
1392 }
1393
1394 void ProfileSyncService::OnActionableError(const SyncProtocolError& error) {
1395   last_actionable_error_ = error;
1396   DCHECK_NE(last_actionable_error_.action,
1397             syncer::UNKNOWN_ACTION);
1398   switch (error.action) {
1399     case syncer::UPGRADE_CLIENT:
1400     case syncer::CLEAR_USER_DATA_AND_RESYNC:
1401     case syncer::ENABLE_SYNC_ON_ACCOUNT:
1402     case syncer::STOP_AND_RESTART_SYNC:
1403       // TODO(lipalani) : if setup in progress we want to display these
1404       // actions in the popup. The current experience might not be optimal for
1405       // the user. We just dismiss the dialog.
1406       if (startup_controller_.setup_in_progress()) {
1407         StopSyncingPermanently();
1408         expect_sync_configuration_aborted_ = true;
1409       }
1410       // Trigger an unrecoverable error to stop syncing.
1411       OnInternalUnrecoverableError(FROM_HERE,
1412                                    last_actionable_error_.error_description,
1413                                    true,
1414                                    ERROR_REASON_ACTIONABLE_ERROR);
1415       break;
1416     case syncer::DISABLE_SYNC_AND_ROLLBACK:
1417       backup_rollback_controller_.OnRollbackReceived();
1418       // Fall through to shutdown backend and sign user out.
1419     case syncer::DISABLE_SYNC_ON_CLIENT:
1420       StopSyncingPermanently();
1421 #if !defined(OS_CHROMEOS)
1422       // On desktop Chrome, sign out the user after a dashboard clear.
1423       // Skip sign out on ChromeOS/Android.
1424       if (!startup_controller_.auto_start_enabled()) {
1425         SigninManagerFactory::GetForProfile(profile_)->SignOut(
1426             signin_metrics::SERVER_FORCED_DISABLE);
1427       }
1428 #endif
1429       break;
1430     case syncer::ROLLBACK_DONE:
1431       backup_rollback_controller_.OnRollbackDone();
1432       break;
1433     case syncer::STOP_SYNC_FOR_DISABLED_ACCOUNT:
1434       // Sync disabled by domain admin. we should stop syncing until next
1435       // restart.
1436       sync_disabled_by_admin_ = true;
1437       ShutdownImpl(syncer::DISABLE_SYNC);
1438       break;
1439     default:
1440       NOTREACHED();
1441   }
1442   NotifyObservers();
1443
1444   if (error.action == syncer::DISABLE_SYNC_ON_CLIENT ||
1445       (error.action == syncer::DISABLE_SYNC_AND_ROLLBACK &&
1446           !backup_rollback_controller_.StartRollback())) {
1447     // Clean up backup data for sign-out only or when rollback is disabled.
1448     CleanUpBackup();
1449   } else if (error.action == syncer::ROLLBACK_DONE) {
1450     // Shut down ROLLBACK backend and delete backup DB.
1451     ShutdownImpl(syncer::DISABLE_SYNC);
1452     sync_prefs_.ClearFirstSyncTime();
1453   }
1454 }
1455
1456 void ProfileSyncService::OnConfigureDone(
1457     const DataTypeManager::ConfigureResult& result) {
1458   configure_status_ = result.status;
1459   data_type_status_table_ = result.data_type_status_table;
1460
1461   if (backend_mode_ != SYNC) {
1462     if (configure_status_ == DataTypeManager::OK) {
1463       StartSyncingWithServer();
1464
1465       // Backup is done after models are associated.
1466       if (backend_mode_ == BACKUP)
1467         backup_finished_ = true;
1468
1469       // Asynchronously check whether sync needs to start.
1470       base::MessageLoop::current()->PostTask(
1471           FROM_HERE, base::Bind(&ProfileSyncService::TryStartSyncAfterBackup,
1472                                 startup_controller_weak_factory_.GetWeakPtr()));
1473     } else if (!expect_sync_configuration_aborted_) {
1474       DVLOG(1) << "Backup/rollback backend failed to configure.";
1475       ShutdownImpl(syncer::STOP_SYNC);
1476     }
1477
1478     return;
1479   }
1480
1481   // We should have cleared our cached passphrase before we get here (in
1482   // OnBackendInitialized()).
1483   DCHECK(cached_passphrase_.empty());
1484
1485   if (!sync_configure_start_time_.is_null()) {
1486     if (result.status == DataTypeManager::OK) {
1487       base::Time sync_configure_stop_time = base::Time::Now();
1488       base::TimeDelta delta = sync_configure_stop_time -
1489           sync_configure_start_time_;
1490       if (is_first_time_sync_configure_) {
1491         UMA_HISTOGRAM_LONG_TIMES("Sync.ServiceInitialConfigureTime", delta);
1492       } else {
1493         UMA_HISTOGRAM_LONG_TIMES("Sync.ServiceSubsequentConfigureTime",
1494                                   delta);
1495       }
1496     }
1497     sync_configure_start_time_ = base::Time();
1498   }
1499
1500   // Notify listeners that configuration is done.
1501   content::NotificationService::current()->Notify(
1502       chrome::NOTIFICATION_SYNC_CONFIGURE_DONE,
1503       content::Source<ProfileSyncService>(this),
1504       content::NotificationService::NoDetails());
1505
1506   DVLOG(1) << "PSS OnConfigureDone called with status: " << configure_status_;
1507   // The possible status values:
1508   //    ABORT - Configuration was aborted. This is not an error, if
1509   //            initiated by user.
1510   //    OK - Some or all types succeeded.
1511   //    Everything else is an UnrecoverableError. So treat it as such.
1512
1513   // First handle the abort case.
1514   if (configure_status_ == DataTypeManager::ABORTED &&
1515       expect_sync_configuration_aborted_) {
1516     DVLOG(0) << "ProfileSyncService::Observe Sync Configure aborted";
1517     expect_sync_configuration_aborted_ = false;
1518     return;
1519   }
1520
1521   // Handle unrecoverable error.
1522   if (configure_status_ != DataTypeManager::OK) {
1523     // Something catastrophic had happened. We should only have one
1524     // error representing it.
1525     syncer::SyncError error =
1526         data_type_status_table_.GetUnrecoverableError();
1527     DCHECK(error.IsSet());
1528     std::string message =
1529         "Sync configuration failed with status " +
1530         DataTypeManager::ConfigureStatusToString(configure_status_) +
1531         " caused by " +
1532         syncer::ModelTypeSetToString(
1533             data_type_status_table_.GetUnrecoverableErrorTypes()) +
1534         ": " + error.message();
1535     LOG(ERROR) << "ProfileSyncService error: " << message;
1536     OnInternalUnrecoverableError(error.location(),
1537                                  message,
1538                                  true,
1539                                  ERROR_REASON_CONFIGURATION_FAILURE);
1540     return;
1541   }
1542
1543   // We should never get in a state where we have no encrypted datatypes
1544   // enabled, and yet we still think we require a passphrase for decryption.
1545   DCHECK(!(IsPassphraseRequiredForDecryption() &&
1546            !IsEncryptedDatatypeEnabled()));
1547
1548   // This must be done before we start syncing with the server to avoid
1549   // sending unencrypted data up on a first time sync.
1550   if (encryption_pending_)
1551     backend_->EnableEncryptEverything();
1552   NotifyObservers();
1553
1554   if (migrator_.get() &&
1555       migrator_->state() != browser_sync::BackendMigrator::IDLE) {
1556     // Migration in progress.  Let the migrator know we just finished
1557     // configuring something.  It will be up to the migrator to call
1558     // StartSyncingWithServer() if migration is now finished.
1559     migrator_->OnConfigureDone(result);
1560   } else {
1561     StartSyncingWithServer();
1562   }
1563 }
1564
1565 void ProfileSyncService::OnConfigureStart() {
1566   sync_configure_start_time_ = base::Time::Now();
1567   NotifyObservers();
1568 }
1569
1570 ProfileSyncService::SyncStatusSummary
1571       ProfileSyncService::QuerySyncStatusSummary() {
1572   if (HasUnrecoverableError()) {
1573     return UNRECOVERABLE_ERROR;
1574   } else if (!backend_) {
1575     return NOT_ENABLED;
1576   } else if (backend_mode_ == BACKUP) {
1577     return BACKUP_USER_DATA;
1578   } else if (backend_mode_ == ROLLBACK) {
1579     return ROLLBACK_USER_DATA;
1580   } else if (backend_.get() && !HasSyncSetupCompleted()) {
1581     return SETUP_INCOMPLETE;
1582   } else if (
1583       backend_.get() && HasSyncSetupCompleted() &&
1584       directory_data_type_manager_.get() &&
1585       directory_data_type_manager_->state() == DataTypeManager::STOPPED) {
1586     return DATATYPES_NOT_INITIALIZED;
1587   } else if (SyncActive()) {
1588     return INITIALIZED;
1589   }
1590   return UNKNOWN_ERROR;
1591 }
1592
1593 std::string ProfileSyncService::QuerySyncStatusSummaryString() {
1594   SyncStatusSummary status = QuerySyncStatusSummary();
1595
1596   std::string config_status_str =
1597       configure_status_ != DataTypeManager::UNKNOWN ?
1598           DataTypeManager::ConfigureStatusToString(configure_status_) : "";
1599
1600   switch (status) {
1601     case UNRECOVERABLE_ERROR:
1602       return "Unrecoverable error detected";
1603     case NOT_ENABLED:
1604       return "Syncing not enabled";
1605     case SETUP_INCOMPLETE:
1606       return "First time sync setup incomplete";
1607     case DATATYPES_NOT_INITIALIZED:
1608       return "Datatypes not fully initialized";
1609     case INITIALIZED:
1610       return "Sync service initialized";
1611     case BACKUP_USER_DATA:
1612       return "Backing-up user data. Status: " + config_status_str;
1613     case ROLLBACK_USER_DATA:
1614       return "Restoring user data. Status: " + config_status_str;
1615     default:
1616       return "Status unknown: Internal error?";
1617   }
1618 }
1619
1620 std::string ProfileSyncService::GetBackendInitializationStateString() const {
1621   return startup_controller_.GetBackendInitializationStateString();
1622 }
1623
1624 bool ProfileSyncService::auto_start_enabled() const {
1625   return startup_controller_.auto_start_enabled();
1626 }
1627
1628 bool ProfileSyncService::setup_in_progress() const {
1629   return startup_controller_.setup_in_progress();
1630 }
1631
1632 bool ProfileSyncService::QueryDetailedSyncStatus(
1633     SyncBackendHost::Status* result) {
1634   if (backend_.get() && backend_initialized_) {
1635     *result = backend_->GetDetailedStatus();
1636     return true;
1637   } else {
1638     SyncBackendHost::Status status;
1639     status.sync_protocol_error = last_actionable_error_;
1640     *result = status;
1641     return false;
1642   }
1643 }
1644
1645 const AuthError& ProfileSyncService::GetAuthError() const {
1646   return last_auth_error_;
1647 }
1648
1649 bool ProfileSyncService::FirstSetupInProgress() const {
1650   return !HasSyncSetupCompleted() && startup_controller_.setup_in_progress();
1651 }
1652
1653 void ProfileSyncService::SetSetupInProgress(bool setup_in_progress) {
1654   // This method is a no-op if |setup_in_progress_| remains unchanged.
1655   if (startup_controller_.setup_in_progress() == setup_in_progress)
1656     return;
1657
1658   startup_controller_.set_setup_in_progress(setup_in_progress);
1659   if (!setup_in_progress && backend_initialized())
1660     ReconfigureDatatypeManager();
1661   NotifyObservers();
1662 }
1663
1664 bool ProfileSyncService::SyncActive() const {
1665   return backend_initialized_ && backend_mode_ == SYNC &&
1666          directory_data_type_manager_ &&
1667          directory_data_type_manager_->state() != DataTypeManager::STOPPED;
1668 }
1669
1670 bool ProfileSyncService::backend_initialized() const {
1671   return backend_initialized_;
1672 }
1673
1674 ProfileSyncService::BackendMode ProfileSyncService::backend_mode() const {
1675   return backend_mode_;
1676 }
1677
1678 bool ProfileSyncService::ConfigurationDone() const {
1679   return directory_data_type_manager_ &&
1680       directory_data_type_manager_->state() == DataTypeManager::CONFIGURED;
1681 }
1682
1683 bool ProfileSyncService::waiting_for_auth() const {
1684   return is_auth_in_progress_;
1685 }
1686
1687 const syncer::Experiments& ProfileSyncService::current_experiments() const {
1688   return current_experiments_;
1689 }
1690
1691 bool ProfileSyncService::HasUnrecoverableError() const {
1692   return unrecoverable_error_reason_ != ERROR_REASON_UNSET;
1693 }
1694
1695 bool ProfileSyncService::IsPassphraseRequired() const {
1696   return passphrase_required_reason_ !=
1697       syncer::REASON_PASSPHRASE_NOT_REQUIRED;
1698 }
1699
1700 bool ProfileSyncService::IsPassphraseRequiredForDecryption() const {
1701   // If there is an encrypted datatype enabled and we don't have the proper
1702   // passphrase, we must prompt the user for a passphrase. The only way for the
1703   // user to avoid entering their passphrase is to disable the encrypted types.
1704   return IsEncryptedDatatypeEnabled() && IsPassphraseRequired();
1705 }
1706
1707 base::string16 ProfileSyncService::GetLastSyncedTimeString() const {
1708   if (last_synced_time_.is_null())
1709     return l10n_util::GetStringUTF16(IDS_SYNC_TIME_NEVER);
1710
1711   base::TimeDelta last_synced = base::Time::Now() - last_synced_time_;
1712
1713   if (last_synced < base::TimeDelta::FromMinutes(1))
1714     return l10n_util::GetStringUTF16(IDS_SYNC_TIME_JUST_NOW);
1715
1716   return ui::TimeFormat::Simple(ui::TimeFormat::FORMAT_ELAPSED,
1717                                 ui::TimeFormat::LENGTH_SHORT, last_synced);
1718 }
1719
1720 void ProfileSyncService::UpdateSelectedTypesHistogram(
1721     bool sync_everything, const syncer::ModelTypeSet chosen_types) const {
1722   if (!HasSyncSetupCompleted() ||
1723       sync_everything != sync_prefs_.HasKeepEverythingSynced()) {
1724     UMA_HISTOGRAM_BOOLEAN("Sync.SyncEverything", sync_everything);
1725   }
1726
1727   // Only log the data types that are shown in the sync settings ui.
1728   // Note: the order of these types must match the ordering of
1729   // the respective types in ModelType
1730   const sync_driver::user_selectable_type::UserSelectableSyncType
1731       user_selectable_types[] = {
1732     sync_driver::user_selectable_type::BOOKMARKS,
1733     sync_driver::user_selectable_type::PREFERENCES,
1734     sync_driver::user_selectable_type::PASSWORDS,
1735     sync_driver::user_selectable_type::AUTOFILL,
1736     sync_driver::user_selectable_type::THEMES,
1737     sync_driver::user_selectable_type::TYPED_URLS,
1738     sync_driver::user_selectable_type::EXTENSIONS,
1739     sync_driver::user_selectable_type::APPS,
1740     sync_driver::user_selectable_type::PROXY_TABS
1741   };
1742
1743   COMPILE_ASSERT(33 == syncer::MODEL_TYPE_COUNT, UpdateCustomConfigHistogram);
1744
1745   if (!sync_everything) {
1746     const syncer::ModelTypeSet current_types = GetPreferredDataTypes();
1747
1748     syncer::ModelTypeSet type_set = syncer::UserSelectableTypes();
1749     syncer::ModelTypeSet::Iterator it = type_set.First();
1750
1751     DCHECK_EQ(arraysize(user_selectable_types), type_set.Size());
1752
1753     for (size_t i = 0; i < arraysize(user_selectable_types) && it.Good();
1754          ++i, it.Inc()) {
1755       const syncer::ModelType type = it.Get();
1756       if (chosen_types.Has(type) &&
1757           (!HasSyncSetupCompleted() || !current_types.Has(type))) {
1758         // Selected type has changed - log it.
1759         UMA_HISTOGRAM_ENUMERATION(
1760             "Sync.CustomSync",
1761             user_selectable_types[i],
1762             sync_driver::user_selectable_type::SELECTABLE_DATATYPE_COUNT + 1);
1763       }
1764     }
1765   }
1766 }
1767
1768 #if defined(OS_CHROMEOS)
1769 void ProfileSyncService::RefreshSpareBootstrapToken(
1770     const std::string& passphrase) {
1771   sync_driver::SystemEncryptor encryptor;
1772   syncer::Cryptographer temp_cryptographer(&encryptor);
1773   // The first 2 params (hostname and username) doesn't have any effect here.
1774   syncer::KeyParams key_params = {"localhost", "dummy", passphrase};
1775
1776   std::string bootstrap_token;
1777   if (!temp_cryptographer.AddKey(key_params)) {
1778     NOTREACHED() << "Failed to add key to cryptographer.";
1779   }
1780   temp_cryptographer.GetBootstrapToken(&bootstrap_token);
1781   sync_prefs_.SetSpareBootstrapToken(bootstrap_token);
1782 }
1783 #endif
1784
1785 void ProfileSyncService::OnUserChoseDatatypes(
1786     bool sync_everything,
1787     syncer::ModelTypeSet chosen_types) {
1788   if (!backend_.get() && !HasUnrecoverableError()) {
1789     NOTREACHED();
1790     return;
1791   }
1792
1793   UpdateSelectedTypesHistogram(sync_everything, chosen_types);
1794   sync_prefs_.SetKeepEverythingSynced(sync_everything);
1795
1796   if (directory_data_type_manager_.get())
1797     directory_data_type_manager_->ResetDataTypeErrors();
1798   ChangePreferredDataTypes(chosen_types);
1799   AcknowledgeSyncedTypes();
1800 }
1801
1802 void ProfileSyncService::ChangePreferredDataTypes(
1803     syncer::ModelTypeSet preferred_types) {
1804
1805   DVLOG(1) << "ChangePreferredDataTypes invoked";
1806   const syncer::ModelTypeSet registered_types = GetRegisteredDataTypes();
1807   const syncer::ModelTypeSet registered_preferred_types =
1808       Intersection(registered_types, preferred_types);
1809   sync_prefs_.SetPreferredDataTypes(registered_types,
1810                                     registered_preferred_types);
1811
1812   // Now reconfigure the DTM.
1813   ReconfigureDatatypeManager();
1814
1815   // TODO(rlarocque): Reconfigure the NonBlockingDataTypeManager, too.  Blocked
1816   // on crbug.com/368834.  Until that bug is fixed, it's difficult to tell
1817   // which types should be enabled and when.
1818 }
1819
1820 syncer::ModelTypeSet ProfileSyncService::GetActiveDataTypes() const {
1821   if (!SyncActive() || !ConfigurationDone())
1822     return syncer::ModelTypeSet();
1823   const syncer::ModelTypeSet preferred_types = GetPreferredDataTypes();
1824   const syncer::ModelTypeSet failed_types =
1825       data_type_status_table_.GetFailedTypes();
1826   return Difference(preferred_types, failed_types);
1827 }
1828
1829 syncer::ModelTypeSet ProfileSyncService::GetPreferredDataTypes() const {
1830   const syncer::ModelTypeSet registered_types = GetRegisteredDataTypes();
1831   const syncer::ModelTypeSet preferred_types =
1832       sync_prefs_.GetPreferredDataTypes(registered_types);
1833   const syncer::ModelTypeSet enforced_types =
1834       Intersection(GetDataTypesFromPreferenceProviders(), registered_types);
1835   return Union(preferred_types, enforced_types);
1836 }
1837
1838 syncer::ModelTypeSet
1839 ProfileSyncService::GetPreferredDirectoryDataTypes() const {
1840   const syncer::ModelTypeSet registered_directory_types =
1841       GetRegisteredDirectoryDataTypes();
1842   const syncer::ModelTypeSet preferred_types =
1843       sync_prefs_.GetPreferredDataTypes(registered_directory_types);
1844   const syncer::ModelTypeSet enforced_types =
1845       Intersection(GetDataTypesFromPreferenceProviders(),
1846                    registered_directory_types);
1847   return Union(preferred_types, enforced_types);
1848 }
1849
1850 syncer::ModelTypeSet
1851 ProfileSyncService::GetPreferredNonBlockingDataTypes() const {
1852   return sync_prefs_.GetPreferredDataTypes(GetRegisteredNonBlockingDataTypes());
1853 }
1854
1855 syncer::ModelTypeSet ProfileSyncService::GetForcedDataTypes() const {
1856   // TODO(treib,zea): When SyncPrefs also implements SyncTypePreferenceProvider,
1857   // we'll need another way to distinguish user-choosable types from
1858   // programmatically-enabled types.
1859   return GetDataTypesFromPreferenceProviders();
1860 }
1861
1862 syncer::ModelTypeSet ProfileSyncService::GetRegisteredDataTypes() const {
1863   return Union(GetRegisteredDirectoryDataTypes(),
1864                GetRegisteredNonBlockingDataTypes());
1865 }
1866
1867 syncer::ModelTypeSet
1868 ProfileSyncService::GetRegisteredDirectoryDataTypes() const {
1869   syncer::ModelTypeSet registered_types;
1870   // The directory_data_type_controllers_ are determined by command-line flags;
1871   // that's effectively what controls the values returned here.
1872   for (DataTypeController::TypeMap::const_iterator it =
1873        directory_data_type_controllers_.begin();
1874        it != directory_data_type_controllers_.end(); ++it) {
1875     registered_types.Put(it->first);
1876   }
1877   return registered_types;
1878 }
1879
1880 syncer::ModelTypeSet
1881 ProfileSyncService::GetRegisteredNonBlockingDataTypes() const {
1882   return non_blocking_data_type_manager_.GetRegisteredTypes();
1883 }
1884
1885 bool ProfileSyncService::IsUsingSecondaryPassphrase() const {
1886   syncer::PassphraseType passphrase_type = GetPassphraseType();
1887   return passphrase_type == syncer::FROZEN_IMPLICIT_PASSPHRASE ||
1888          passphrase_type == syncer::CUSTOM_PASSPHRASE;
1889 }
1890
1891 syncer::PassphraseType ProfileSyncService::GetPassphraseType() const {
1892   return backend_->GetPassphraseType();
1893 }
1894
1895 base::Time ProfileSyncService::GetExplicitPassphraseTime() const {
1896   return backend_->GetExplicitPassphraseTime();
1897 }
1898
1899 bool ProfileSyncService::IsCryptographerReady(
1900     const syncer::BaseTransaction* trans) const {
1901   return backend_.get() && backend_->IsCryptographerReady(trans);
1902 }
1903
1904 void ProfileSyncService::ConfigurePriorityDataTypes() {
1905   const syncer::ModelTypeSet priority_types =
1906       Intersection(GetPreferredDirectoryDataTypes(),
1907                    syncer::PriorityUserTypes());
1908   if (!priority_types.Empty()) {
1909     const syncer::ConfigureReason reason = HasSyncSetupCompleted() ?
1910         syncer::CONFIGURE_REASON_RECONFIGURATION :
1911         syncer::CONFIGURE_REASON_NEW_CLIENT;
1912     directory_data_type_manager_->Configure(priority_types, reason);
1913   }
1914 }
1915
1916 void ProfileSyncService::ConfigureDataTypeManager() {
1917   // Don't configure datatypes if the setup UI is still on the screen - this
1918   // is to help multi-screen setting UIs (like iOS) where they don't want to
1919   // start syncing data until the user is done configuring encryption options,
1920   // etc. ReconfigureDatatypeManager() will get called again once the UI calls
1921   // SetSetupInProgress(false).
1922   if (backend_mode_ == SYNC && startup_controller_.setup_in_progress())
1923     return;
1924
1925   bool restart = false;
1926   if (!directory_data_type_manager_) {
1927     restart = true;
1928     directory_data_type_manager_.reset(
1929         factory_->CreateDataTypeManager(debug_info_listener_,
1930                                         &directory_data_type_controllers_,
1931                                         this,
1932                                         backend_.get(),
1933                                         this));
1934
1935     // We create the migrator at the same time.
1936     migrator_.reset(
1937         new browser_sync::BackendMigrator(
1938             profile_->GetDebugName(), GetUserShare(),
1939             this, directory_data_type_manager_.get(),
1940             base::Bind(&ProfileSyncService::StartSyncingWithServer,
1941                        base::Unretained(this))));
1942   }
1943
1944   syncer::ModelTypeSet types;
1945   syncer::ConfigureReason reason = syncer::CONFIGURE_REASON_UNKNOWN;
1946   if (backend_mode_ == BACKUP || backend_mode_ == ROLLBACK) {
1947     types = syncer::BackupTypes();
1948     reason = syncer::CONFIGURE_REASON_BACKUP_ROLLBACK;
1949   } else {
1950     types = GetPreferredDirectoryDataTypes();
1951     if (!HasSyncSetupCompleted()) {
1952       reason = syncer::CONFIGURE_REASON_NEW_CLIENT;
1953     } else if (restart) {
1954       // Datatype downloads on restart are generally due to newly supported
1955       // datatypes (although it's also possible we're picking up where a failed
1956       // previous configuration left off).
1957       // TODO(sync): consider detecting configuration recovery and setting
1958       // the reason here appropriately.
1959       reason = syncer::CONFIGURE_REASON_NEWLY_ENABLED_DATA_TYPE;
1960     } else {
1961       // The user initiated a reconfiguration (either to add or remove types).
1962       reason = syncer::CONFIGURE_REASON_RECONFIGURATION;
1963     }
1964   }
1965
1966   directory_data_type_manager_->Configure(types, reason);
1967 }
1968
1969 syncer::UserShare* ProfileSyncService::GetUserShare() const {
1970   if (backend_.get() && backend_initialized_) {
1971     return backend_->GetUserShare();
1972   }
1973   NOTREACHED();
1974   return NULL;
1975 }
1976
1977 syncer::sessions::SyncSessionSnapshot
1978 ProfileSyncService::GetLastSessionSnapshot() const {
1979   if (backend_)
1980     return backend_->GetLastSessionSnapshot();
1981   return syncer::sessions::SyncSessionSnapshot();
1982 }
1983
1984 bool ProfileSyncService::HasUnsyncedItems() const {
1985   if (HasSyncingBackend() && backend_initialized_) {
1986     return backend_->HasUnsyncedItems();
1987   }
1988   NOTREACHED();
1989   return false;
1990 }
1991
1992 browser_sync::BackendMigrator*
1993 ProfileSyncService::GetBackendMigratorForTest() {
1994   return migrator_.get();
1995 }
1996
1997 void ProfileSyncService::GetModelSafeRoutingInfo(
1998     syncer::ModelSafeRoutingInfo* out) const {
1999   if (backend_.get() && backend_initialized_) {
2000     backend_->GetModelSafeRoutingInfo(out);
2001   } else {
2002     NOTREACHED();
2003   }
2004 }
2005
2006 base::Value* ProfileSyncService::GetTypeStatusMap() const {
2007   scoped_ptr<base::ListValue> result(new base::ListValue());
2008
2009   if (!backend_.get() || !backend_initialized_) {
2010     return result.release();
2011   }
2012
2013   DataTypeStatusTable::TypeErrorMap error_map =
2014       data_type_status_table_.GetAllErrors();
2015   ModelTypeSet active_types;
2016   ModelTypeSet passive_types;
2017   ModelSafeRoutingInfo routing_info;
2018   backend_->GetModelSafeRoutingInfo(&routing_info);
2019   for (ModelSafeRoutingInfo::const_iterator it = routing_info.begin();
2020        it != routing_info.end(); ++it) {
2021     if (it->second == syncer::GROUP_PASSIVE) {
2022       passive_types.Put(it->first);
2023     } else {
2024       active_types.Put(it->first);
2025     }
2026   }
2027
2028   SyncBackendHost::Status detailed_status = backend_->GetDetailedStatus();
2029   ModelTypeSet &throttled_types(detailed_status.throttled_types);
2030   ModelTypeSet registered = GetRegisteredDataTypes();
2031   scoped_ptr<base::DictionaryValue> type_status_header(
2032       new base::DictionaryValue());
2033
2034   type_status_header->SetString("name", "Model Type");
2035   type_status_header->SetString("status", "header");
2036   type_status_header->SetString("value", "Group Type");
2037   type_status_header->SetString("num_entries", "Total Entries");
2038   type_status_header->SetString("num_live", "Live Entries");
2039   result->Append(type_status_header.release());
2040
2041   scoped_ptr<base::DictionaryValue> type_status;
2042   for (ModelTypeSet::Iterator it = registered.First(); it.Good(); it.Inc()) {
2043     ModelType type = it.Get();
2044
2045     type_status.reset(new base::DictionaryValue());
2046     type_status->SetString("name", ModelTypeToString(type));
2047
2048     if (error_map.find(type) != error_map.end()) {
2049       const syncer::SyncError &error = error_map.find(type)->second;
2050       DCHECK(error.IsSet());
2051       switch (error.GetSeverity()) {
2052         case syncer::SyncError::SYNC_ERROR_SEVERITY_ERROR: {
2053             std::string error_text = "Error: " + error.location().ToString() +
2054                 ", " + error.GetMessagePrefix() + error.message();
2055             type_status->SetString("status", "error");
2056             type_status->SetString("value", error_text);
2057           }
2058           break;
2059         case syncer::SyncError::SYNC_ERROR_SEVERITY_INFO:
2060           type_status->SetString("status", "disabled");
2061           type_status->SetString("value", error.message());
2062           break;
2063         default:
2064           NOTREACHED() << "Unexpected error severity.";
2065           break;
2066       }
2067     } else if (syncer::IsProxyType(type) && passive_types.Has(type)) {
2068       // Show a proxy type in "ok" state unless it is disabled by user.
2069       DCHECK(!throttled_types.Has(type));
2070       type_status->SetString("status", "ok");
2071       type_status->SetString("value", "Passive");
2072     } else if (throttled_types.Has(type) && passive_types.Has(type)) {
2073       type_status->SetString("status", "warning");
2074       type_status->SetString("value", "Passive, Throttled");
2075     } else if (passive_types.Has(type)) {
2076       type_status->SetString("status", "warning");
2077       type_status->SetString("value", "Passive");
2078     } else if (throttled_types.Has(type)) {
2079       type_status->SetString("status", "warning");
2080       type_status->SetString("value", "Throttled");
2081     } else if (GetRegisteredNonBlockingDataTypes().Has(type)) {
2082       type_status->SetString("status", "ok");
2083       type_status->SetString("value", "Non-Blocking");
2084     } else if (active_types.Has(type)) {
2085       type_status->SetString("status", "ok");
2086       type_status->SetString("value", "Active: " +
2087                              ModelSafeGroupToString(routing_info[type]));
2088     } else {
2089       type_status->SetString("status", "warning");
2090       type_status->SetString("value", "Disabled by User");
2091     }
2092
2093     int live_count = detailed_status.num_entries_by_type[type] -
2094         detailed_status.num_to_delete_entries_by_type[type];
2095     type_status->SetInteger("num_entries",
2096                             detailed_status.num_entries_by_type[type]);
2097     type_status->SetInteger("num_live", live_count);
2098
2099     result->Append(type_status.release());
2100   }
2101   return result.release();
2102 }
2103
2104 void ProfileSyncService::DeactivateDataType(syncer::ModelType type) {
2105   if (!backend_)
2106     return;
2107   backend_->DeactivateDataType(type);
2108 }
2109
2110 void ProfileSyncService::ConsumeCachedPassphraseIfPossible() {
2111   // If no cached passphrase, or sync backend hasn't started up yet, just exit.
2112   // If the backend isn't running yet, OnBackendInitialized() will call this
2113   // method again after the backend starts up.
2114   if (cached_passphrase_.empty() || !backend_initialized())
2115     return;
2116
2117   // Backend is up and running, so we can consume the cached passphrase.
2118   std::string passphrase = cached_passphrase_;
2119   cached_passphrase_.clear();
2120
2121   // If we need a passphrase to decrypt data, try the cached passphrase.
2122   if (passphrase_required_reason() == syncer::REASON_DECRYPTION) {
2123     if (SetDecryptionPassphrase(passphrase)) {
2124       DVLOG(1) << "Cached passphrase successfully decrypted pending keys";
2125       return;
2126     }
2127   }
2128
2129   // If we get here, we don't have pending keys (or at least, the passphrase
2130   // doesn't decrypt them) - just try to re-encrypt using the encryption
2131   // passphrase.
2132   if (!IsUsingSecondaryPassphrase())
2133     SetEncryptionPassphrase(passphrase, IMPLICIT);
2134 }
2135
2136 void ProfileSyncService::RequestAccessToken() {
2137   // Only one active request at a time.
2138   if (access_token_request_ != NULL)
2139     return;
2140   request_access_token_retry_timer_.Stop();
2141   OAuth2TokenService::ScopeSet oauth2_scopes;
2142   oauth2_scopes.insert(signin_->GetSyncScopeToUse());
2143
2144   // Invalidate previous token, otherwise token service will return the same
2145   // token again.
2146   const std::string& account_id = signin_->GetAccountIdToUse();
2147   if (!access_token_.empty()) {
2148     oauth2_token_service_->InvalidateToken(
2149         account_id, oauth2_scopes, access_token_);
2150   }
2151
2152   access_token_.clear();
2153
2154   token_request_time_ = base::Time::Now();
2155   token_receive_time_ = base::Time();
2156   next_token_request_time_ = base::Time();
2157   access_token_request_ =
2158       oauth2_token_service_->StartRequest(account_id, oauth2_scopes, this);
2159 }
2160
2161 void ProfileSyncService::SetEncryptionPassphrase(const std::string& passphrase,
2162                                                  PassphraseType type) {
2163   // This should only be called when the backend has been initialized.
2164   DCHECK(backend_initialized());
2165   DCHECK(!(type == IMPLICIT && IsUsingSecondaryPassphrase())) <<
2166       "Data is already encrypted using an explicit passphrase";
2167   DCHECK(!(type == EXPLICIT &&
2168            passphrase_required_reason_ == syncer::REASON_DECRYPTION)) <<
2169          "Can not set explicit passphrase when decryption is needed.";
2170
2171   DVLOG(1) << "Setting " << (type == EXPLICIT ? "explicit" : "implicit")
2172            << " passphrase for encryption.";
2173   if (passphrase_required_reason_ == syncer::REASON_ENCRYPTION) {
2174     // REASON_ENCRYPTION implies that the cryptographer does not have pending
2175     // keys. Hence, as long as we're not trying to do an invalid passphrase
2176     // change (e.g. explicit -> explicit or explicit -> implicit), we know this
2177     // will succeed. If for some reason a new encryption key arrives via
2178     // sync later, the SBH will trigger another OnPassphraseRequired().
2179     passphrase_required_reason_ = syncer::REASON_PASSPHRASE_NOT_REQUIRED;
2180     NotifyObservers();
2181   }
2182   backend_->SetEncryptionPassphrase(passphrase, type == EXPLICIT);
2183 }
2184
2185 bool ProfileSyncService::SetDecryptionPassphrase(
2186     const std::string& passphrase) {
2187   if (IsPassphraseRequired()) {
2188     DVLOG(1) << "Setting passphrase for decryption.";
2189     return backend_->SetDecryptionPassphrase(passphrase);
2190   } else {
2191     NOTREACHED() << "SetDecryptionPassphrase must not be called when "
2192                     "IsPassphraseRequired() is false.";
2193     return false;
2194   }
2195 }
2196
2197 void ProfileSyncService::EnableEncryptEverything() {
2198   // Tests override backend_initialized() to always return true, so we
2199   // must check that instead of |backend_initialized_|.
2200   // TODO(akalin): Fix the above. :/
2201   DCHECK(backend_initialized());
2202   // TODO(atwilson): Persist the encryption_pending_ flag to address the various
2203   // problems around cancelling encryption in the background (crbug.com/119649).
2204   if (!encrypt_everything_)
2205     encryption_pending_ = true;
2206 }
2207
2208 bool ProfileSyncService::encryption_pending() const {
2209   // We may be called during the setup process before we're
2210   // initialized (via IsEncryptedDatatypeEnabled and
2211   // IsPassphraseRequiredForDecryption).
2212   return encryption_pending_;
2213 }
2214
2215 bool ProfileSyncService::EncryptEverythingEnabled() const {
2216   DCHECK(backend_initialized_);
2217   return encrypt_everything_ || encryption_pending_;
2218 }
2219
2220 syncer::ModelTypeSet ProfileSyncService::GetEncryptedDataTypes() const {
2221   DCHECK(encrypted_types_.Has(syncer::PASSWORDS));
2222   // We may be called during the setup process before we're
2223   // initialized.  In this case, we default to the sensitive types.
2224   return encrypted_types_;
2225 }
2226
2227 void ProfileSyncService::OnSyncManagedPrefChange(bool is_sync_managed) {
2228   if (is_sync_managed) {
2229     DisableForUser();
2230   } else {
2231     // Sync is no longer disabled by policy. Try starting it up if appropriate.
2232     startup_controller_.TryStart();
2233   }
2234 }
2235
2236 void ProfileSyncService::GoogleSigninSucceeded(const std::string& account_id,
2237                                                const std::string& username,
2238                                                const std::string& password) {
2239   if (!sync_prefs_.IsStartSuppressed() && !password.empty()) {
2240     cached_passphrase_ = password;
2241     // Try to consume the passphrase we just cached. If the sync backend
2242     // is not running yet, the passphrase will remain cached until the
2243     // backend starts up.
2244     ConsumeCachedPassphraseIfPossible();
2245   }
2246 #if defined(OS_CHROMEOS)
2247   RefreshSpareBootstrapToken(password);
2248 #endif
2249   if (!backend_initialized() || GetAuthError().state() != AuthError::NONE) {
2250     // Track the fact that we're still waiting for auth to complete.
2251     is_auth_in_progress_ = true;
2252   }
2253 }
2254
2255 void ProfileSyncService::GoogleSignedOut(const std::string& account_id,
2256                                          const std::string& username) {
2257   sync_disabled_by_admin_ = false;
2258   DisableForUser();
2259
2260   if (browser_sync::BackupRollbackController::IsBackupEnabled()) {
2261     need_backup_ = true;
2262     backup_finished_ = false;
2263   }
2264 }
2265
2266 void ProfileSyncService::AddObserver(
2267     ProfileSyncServiceBase::Observer* observer) {
2268   observers_.AddObserver(observer);
2269 }
2270
2271 void ProfileSyncService::RemoveObserver(
2272     ProfileSyncServiceBase::Observer* observer) {
2273   observers_.RemoveObserver(observer);
2274 }
2275
2276 void ProfileSyncService::AddProtocolEventObserver(
2277     browser_sync::ProtocolEventObserver* observer) {
2278   protocol_event_observers_.AddObserver(observer);
2279   if (HasSyncingBackend()) {
2280     backend_->RequestBufferedProtocolEventsAndEnableForwarding();
2281   }
2282 }
2283
2284 void ProfileSyncService::RemoveProtocolEventObserver(
2285     browser_sync::ProtocolEventObserver* observer) {
2286   protocol_event_observers_.RemoveObserver(observer);
2287   if (HasSyncingBackend() &&
2288       !protocol_event_observers_.might_have_observers()) {
2289     backend_->DisableProtocolEventForwarding();
2290   }
2291 }
2292
2293 void ProfileSyncService::AddTypeDebugInfoObserver(
2294     syncer::TypeDebugInfoObserver* type_debug_info_observer) {
2295   type_debug_info_observers_.AddObserver(type_debug_info_observer);
2296   if (type_debug_info_observers_.might_have_observers() &&
2297       backend_initialized_) {
2298     backend_->EnableDirectoryTypeDebugInfoForwarding();
2299   }
2300 }
2301
2302 void ProfileSyncService::RemoveTypeDebugInfoObserver(
2303     syncer::TypeDebugInfoObserver* type_debug_info_observer) {
2304   type_debug_info_observers_.RemoveObserver(type_debug_info_observer);
2305   if (!type_debug_info_observers_.might_have_observers() &&
2306       backend_initialized_) {
2307     backend_->DisableDirectoryTypeDebugInfoForwarding();
2308   }
2309 }
2310
2311 void ProfileSyncService::AddPreferenceProvider(
2312     SyncTypePreferenceProvider* provider) {
2313   DCHECK(!HasPreferenceProvider(provider))
2314       << "Providers may only be added once!";
2315   preference_providers_.insert(provider);
2316 }
2317
2318 void ProfileSyncService::RemovePreferenceProvider(
2319     SyncTypePreferenceProvider* provider) {
2320   DCHECK(HasPreferenceProvider(provider))
2321       << "Only providers that have been added before can be removed!";
2322   preference_providers_.erase(provider);
2323 }
2324
2325 bool ProfileSyncService::HasPreferenceProvider(
2326     SyncTypePreferenceProvider* provider) const {
2327   return preference_providers_.count(provider) > 0;
2328 }
2329
2330 namespace {
2331
2332 class GetAllNodesRequestHelper
2333     : public base::RefCountedThreadSafe<GetAllNodesRequestHelper> {
2334  public:
2335   GetAllNodesRequestHelper(
2336       syncer::ModelTypeSet requested_types,
2337       const base::Callback<void(scoped_ptr<base::ListValue>)>& callback);
2338
2339   void OnReceivedNodesForTypes(
2340       const std::vector<syncer::ModelType>& types,
2341       ScopedVector<base::ListValue> scoped_node_lists);
2342
2343  private:
2344   friend class base::RefCountedThreadSafe<GetAllNodesRequestHelper>;
2345   virtual ~GetAllNodesRequestHelper();
2346
2347   scoped_ptr<base::ListValue> result_accumulator_;
2348
2349   syncer::ModelTypeSet awaiting_types_;
2350   base::Callback<void(scoped_ptr<base::ListValue>)> callback_;
2351 };
2352
2353 GetAllNodesRequestHelper::GetAllNodesRequestHelper(
2354     syncer::ModelTypeSet requested_types,
2355     const base::Callback<void(scoped_ptr<base::ListValue>)>& callback)
2356     : result_accumulator_(new base::ListValue()),
2357       awaiting_types_(requested_types),
2358       callback_(callback) {}
2359
2360 GetAllNodesRequestHelper::~GetAllNodesRequestHelper() {
2361   if (!awaiting_types_.Empty()) {
2362     DLOG(WARNING)
2363         << "GetAllNodesRequest deleted before request was fulfilled.  "
2364         << "Missing types are: " << ModelTypeSetToString(awaiting_types_);
2365   }
2366 }
2367
2368 // Called when the set of nodes for a type or set of types has been returned.
2369 //
2370 // The nodes for several types can be returned at the same time by specifying
2371 // their types in the |types| array, and putting their results at the
2372 // correspnding indices in the |scoped_node_lists|.
2373 void GetAllNodesRequestHelper::OnReceivedNodesForTypes(
2374     const std::vector<syncer::ModelType>& types,
2375     ScopedVector<base::ListValue> scoped_node_lists) {
2376   DCHECK_EQ(types.size(), scoped_node_lists.size());
2377
2378   // Take unsafe ownership of the node list.
2379   std::vector<base::ListValue*> node_lists;
2380   scoped_node_lists.release(&node_lists);
2381
2382   for (size_t i = 0; i < node_lists.size() && i < types.size(); ++i) {
2383     const ModelType type = types[i];
2384     base::ListValue* node_list = node_lists[i];
2385
2386     // Add these results to our list.
2387     scoped_ptr<base::DictionaryValue> type_dict(new base::DictionaryValue());
2388     type_dict->SetString("type", ModelTypeToString(type));
2389     type_dict->Set("nodes", node_list);
2390     result_accumulator_->Append(type_dict.release());
2391
2392     // Remember that this part of the request is satisfied.
2393     awaiting_types_.Remove(type);
2394   }
2395
2396   if (awaiting_types_.Empty()) {
2397     callback_.Run(result_accumulator_.Pass());
2398     callback_.Reset();
2399   }
2400 }
2401
2402 }  // namespace
2403
2404 void ProfileSyncService::GetAllNodes(
2405     const base::Callback<void(scoped_ptr<base::ListValue>)>& callback) {
2406   ModelTypeSet directory_types = GetRegisteredDirectoryDataTypes();
2407   directory_types.PutAll(syncer::ControlTypes());
2408   scoped_refptr<GetAllNodesRequestHelper> helper =
2409       new GetAllNodesRequestHelper(directory_types, callback);
2410
2411   if (!backend_initialized_) {
2412     // If there's no backend available to fulfill the request, handle it here.
2413     ScopedVector<base::ListValue> empty_results;
2414     std::vector<ModelType> type_vector;
2415     for (ModelTypeSet::Iterator it = directory_types.First();
2416          it.Good(); it.Inc()) {
2417       type_vector.push_back(it.Get());
2418       empty_results.push_back(new base::ListValue());
2419     }
2420     helper->OnReceivedNodesForTypes(type_vector, empty_results.Pass());
2421   } else {
2422     backend_->GetAllNodesForTypes(
2423         directory_types,
2424         base::Bind(&GetAllNodesRequestHelper::OnReceivedNodesForTypes, helper));
2425   }
2426 }
2427
2428 bool ProfileSyncService::HasObserver(
2429     ProfileSyncServiceBase::Observer* observer) const {
2430   return observers_.HasObserver(observer);
2431 }
2432
2433 base::WeakPtr<syncer::JsController> ProfileSyncService::GetJsController() {
2434   return sync_js_controller_.AsWeakPtr();
2435 }
2436
2437 void ProfileSyncService::SyncEvent(SyncEventCodes code) {
2438   UMA_HISTOGRAM_ENUMERATION("Sync.EventCodes", code, MAX_SYNC_EVENT_CODE);
2439 }
2440
2441 // static
2442 bool ProfileSyncService::IsSyncEnabled() {
2443   // We have switches::kEnableSync just in case we need to change back to
2444   // sync-disabled-by-default on a platform.
2445   return !CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableSync);
2446 }
2447
2448 bool ProfileSyncService::IsManaged() const {
2449   return sync_prefs_.IsManaged() || sync_disabled_by_admin_;
2450 }
2451
2452 void ProfileSyncService::StopAndSuppress() {
2453   sync_prefs_.SetStartSuppressed(true);
2454   if (HasSyncingBackend()) {
2455     backend_->UnregisterInvalidationIds();
2456   }
2457   ShutdownImpl(syncer::STOP_SYNC);
2458 }
2459
2460 bool ProfileSyncService::IsStartSuppressed() const {
2461   return sync_prefs_.IsStartSuppressed();
2462 }
2463
2464 SigninManagerBase* ProfileSyncService::signin() const {
2465   if (!signin_)
2466     return NULL;
2467   return signin_->GetOriginal();
2468 }
2469
2470 void ProfileSyncService::UnsuppressAndStart() {
2471   DCHECK(profile_);
2472   sync_prefs_.SetStartSuppressed(false);
2473   if (signin_.get() && !signin_->GetOriginal()->IsAuthenticated()) {
2474     signin_->GetOriginal()->SetAuthenticatedUsername(
2475         profile_->GetPrefs()->GetString(prefs::kGoogleServicesUsername));
2476   }
2477   startup_controller_.TryStart();
2478 }
2479
2480 void ProfileSyncService::AcknowledgeSyncedTypes() {
2481   sync_prefs_.AcknowledgeSyncedTypes(GetRegisteredDataTypes());
2482 }
2483
2484 void ProfileSyncService::ReconfigureDatatypeManager() {
2485   // If we haven't initialized yet, don't configure the DTM as it could cause
2486   // association to start before a Directory has even been created.
2487   if (backend_initialized_) {
2488     DCHECK(backend_.get());
2489     ConfigureDataTypeManager();
2490   } else if (HasUnrecoverableError()) {
2491     // There is nothing more to configure. So inform the listeners,
2492     NotifyObservers();
2493
2494     DVLOG(1) << "ConfigureDataTypeManager not invoked because of an "
2495              << "Unrecoverable error.";
2496   } else {
2497     DVLOG(0) << "ConfigureDataTypeManager not invoked because backend is not "
2498              << "initialized";
2499   }
2500 }
2501
2502 syncer::ModelTypeSet ProfileSyncService::GetDataTypesFromPreferenceProviders()
2503     const {
2504   syncer::ModelTypeSet types;
2505   for (std::set<SyncTypePreferenceProvider*>::const_iterator it =
2506            preference_providers_.begin();
2507        it != preference_providers_.end();
2508        ++it) {
2509     types.PutAll((*it)->GetPreferredDataTypes());
2510   }
2511   return types;
2512 }
2513
2514 const DataTypeStatusTable& ProfileSyncService::data_type_status_table()
2515     const {
2516   return data_type_status_table_;
2517 }
2518
2519 void ProfileSyncService::OnInternalUnrecoverableError(
2520     const tracked_objects::Location& from_here,
2521     const std::string& message,
2522     bool delete_sync_database,
2523     UnrecoverableErrorReason reason) {
2524   DCHECK(!HasUnrecoverableError());
2525   unrecoverable_error_reason_ = reason;
2526   OnUnrecoverableErrorImpl(from_here, message, delete_sync_database);
2527 }
2528
2529 syncer::SyncManagerFactory::MANAGER_TYPE
2530 ProfileSyncService::GetManagerType() const {
2531   switch (backend_mode_) {
2532     case SYNC:
2533       return syncer::SyncManagerFactory::NORMAL;
2534     case BACKUP:
2535       return syncer::SyncManagerFactory::BACKUP;
2536     case ROLLBACK:
2537       return syncer::SyncManagerFactory::ROLLBACK;
2538     case IDLE:
2539       NOTREACHED();
2540   }
2541   return syncer::SyncManagerFactory::NORMAL;
2542 }
2543
2544 bool ProfileSyncService::IsRetryingAccessTokenFetchForTest() const {
2545   return request_access_token_retry_timer_.IsRunning();
2546 }
2547
2548 std::string ProfileSyncService::GetAccessTokenForTest() const {
2549   return access_token_;
2550 }
2551
2552 WeakHandle<syncer::JsEventHandler> ProfileSyncService::GetJsEventHandler() {
2553   return MakeWeakHandle(sync_js_controller_.AsWeakPtr());
2554 }
2555
2556 syncer::SyncableService* ProfileSyncService::GetSessionsSyncableService() {
2557   return sessions_sync_manager_.get();
2558 }
2559
2560 syncer::SyncableService* ProfileSyncService::GetDeviceInfoSyncableService() {
2561   return device_info_sync_service_.get();
2562 }
2563
2564 ProfileSyncService::SyncTokenStatus::SyncTokenStatus()
2565     : connection_status(syncer::CONNECTION_NOT_ATTEMPTED),
2566       last_get_token_error(GoogleServiceAuthError::AuthErrorNone()) {}
2567 ProfileSyncService::SyncTokenStatus::~SyncTokenStatus() {}
2568
2569 ProfileSyncService::SyncTokenStatus
2570 ProfileSyncService::GetSyncTokenStatus() const {
2571   SyncTokenStatus status;
2572   status.connection_status_update_time = connection_status_update_time_;
2573   status.connection_status = connection_status_;
2574   status.token_request_time = token_request_time_;
2575   status.token_receive_time = token_receive_time_;
2576   status.last_get_token_error = last_get_token_error_;
2577   if (request_access_token_retry_timer_.IsRunning())
2578     status.next_token_request_time = next_token_request_time_;
2579   return status;
2580 }
2581
2582 void ProfileSyncService::OverrideNetworkResourcesForTest(
2583     scoped_ptr<syncer::NetworkResources> network_resources) {
2584   network_resources_ = network_resources.Pass();
2585 }
2586
2587 bool ProfileSyncService::HasSyncingBackend() const {
2588   return backend_mode_ != SYNC ? false : backend_ != NULL;
2589 }
2590
2591 void ProfileSyncService::UpdateFirstSyncTimePref() {
2592   if (signin_->GetEffectiveUsername().empty()) {
2593     // Clear if user's not signed in and rollback is done.
2594     if (backend_mode_ != ROLLBACK)
2595       sync_prefs_.ClearFirstSyncTime();
2596   } else if (sync_prefs_.GetFirstSyncTime().is_null() &&
2597       backend_mode_ == SYNC) {
2598     // Set if not set before and it's syncing now.
2599     sync_prefs_.SetFirstSyncTime(base::Time::Now());
2600   }
2601 }
2602
2603 void ProfileSyncService::ClearBrowsingDataSinceFirstSync() {
2604   base::Time first_sync_time = sync_prefs_.GetFirstSyncTime();
2605   if (first_sync_time.is_null())
2606     return;
2607
2608   clear_browsing_data_.Run(browsing_data_remover_observer_,
2609                            profile_,
2610                            first_sync_time,
2611                            base::Time::Now());
2612 }
2613
2614 void ProfileSyncService::SetBrowsingDataRemoverObserverForTesting(
2615     BrowsingDataRemover::Observer* observer) {
2616   browsing_data_remover_observer_ = observer;
2617 }
2618
2619 void ProfileSyncService::SetClearingBrowseringDataForTesting(
2620     base::Callback<void(BrowsingDataRemover::Observer* observer,
2621                         Profile*,
2622                         base::Time,
2623                         base::Time)> c) {
2624   clear_browsing_data_ = c;
2625 }
2626
2627 GURL ProfileSyncService::GetSyncServiceURL(
2628     const base::CommandLine& command_line) {
2629   // By default, dev, canary, and unbranded Chromium users will go to the
2630   // development servers. Development servers have more features than standard
2631   // sync servers. Users with officially-branded Chrome stable and beta builds
2632   // will go to the standard sync servers.
2633   GURL result(kDevServerUrl);
2634
2635   chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
2636   if (channel == chrome::VersionInfo::CHANNEL_STABLE ||
2637       channel == chrome::VersionInfo::CHANNEL_BETA) {
2638     result = GURL(kSyncServerUrl);
2639   }
2640
2641   // Override the sync server URL from the command-line, if sync server
2642   // command-line argument exists.
2643   if (command_line.HasSwitch(switches::kSyncServiceURL)) {
2644     std::string value(command_line.GetSwitchValueASCII(
2645         switches::kSyncServiceURL));
2646     if (!value.empty()) {
2647       GURL custom_sync_url(value);
2648       if (custom_sync_url.is_valid()) {
2649         result = custom_sync_url;
2650       } else {
2651         LOG(WARNING) << "The following sync URL specified at the command-line "
2652                      << "is invalid: " << value;
2653       }
2654     }
2655   }
2656   return result;
2657 }
2658
2659 void ProfileSyncService::CheckSyncBackupIfNeeded() {
2660   DCHECK_EQ(backend_mode_, SYNC);
2661
2662 #if defined(ENABLE_PRE_SYNC_BACKUP)
2663   // Check backup once a day.
2664   if (!last_backup_time_ &&
2665       (last_synced_time_.is_null() ||
2666           base::Time::Now() - last_synced_time_ >=
2667               base::TimeDelta::FromDays(1))) {
2668     // If sync thread is set, need to serialize check on sync thread after
2669     // closing backup DB.
2670     if (sync_thread_) {
2671       sync_thread_->message_loop_proxy()->PostTask(
2672           FROM_HERE,
2673           base::Bind(syncer::CheckSyncDbLastModifiedTime,
2674                      profile_->GetPath().Append(kSyncBackupDataFolderName),
2675                      base::MessageLoopProxy::current(),
2676                      base::Bind(&ProfileSyncService::CheckSyncBackupCallback,
2677                                 weak_factory_.GetWeakPtr())));
2678     } else {
2679       content::BrowserThread::PostTask(
2680           content::BrowserThread::FILE, FROM_HERE,
2681           base::Bind(syncer::CheckSyncDbLastModifiedTime,
2682                      profile_->GetPath().Append(kSyncBackupDataFolderName),
2683                      base::MessageLoopProxy::current(),
2684                      base::Bind(&ProfileSyncService::CheckSyncBackupCallback,
2685                                 weak_factory_.GetWeakPtr())));
2686     }
2687   }
2688 #endif
2689 }
2690
2691 void ProfileSyncService::CheckSyncBackupCallback(base::Time backup_time) {
2692   last_backup_time_.reset(new base::Time(backup_time));
2693
2694   DCHECK(device_info_sync_service_);
2695   device_info_sync_service_->UpdateLocalDeviceBackupTime(*last_backup_time_);
2696 }
2697
2698 void ProfileSyncService::TryStartSyncAfterBackup() {
2699   startup_controller_.Reset(GetRegisteredDataTypes());
2700   startup_controller_.TryStart();
2701 }
2702
2703 void ProfileSyncService::CleanUpBackup() {
2704   sync_prefs_.ClearFirstSyncTime();
2705   profile_->GetIOTaskRunner()->PostTask(
2706       FROM_HERE,
2707       base::Bind(base::IgnoreResult(base::DeleteFile),
2708                  profile_->GetPath().Append(kSyncBackupDataFolderName),
2709                  true));
2710 }
2711
2712 bool ProfileSyncService::NeedBackup() const {
2713   return need_backup_;
2714 }
2715
2716 base::Time ProfileSyncService::GetDeviceBackupTimeForTesting() const {
2717   return device_info_sync_service_->GetLocalDeviceBackupTime();
2718 }
2719
2720 void ProfileSyncService::FlushDirectory() const {
2721   // backend_initialized_ implies backend_ isn't NULL and the manager exists.
2722   // If sync is not initialized yet, we fail silently.
2723   if (backend_initialized_)
2724     backend_->FlushDirectory();
2725 }