webkit/browser/fileapi/sandbox_file_system_backend_delegate.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "webkit/browser/fileapi/sandbox_file_system_backend_delegate.h"
   6
   7 #include <vector>
   8
   9 #include "base/command_line.h"
  10 #include "base/file_util.h"
  11 #include "base/metrics/histogram.h"
  12 #include "base/stl_util.h"
  13 #include "base/task_runner_util.h"
  14 #include "net/base/net_util.h"
  15 #include "webkit/browser/blob/file_stream_reader.h"
  16 #include "webkit/browser/fileapi/async_file_util_adapter.h"
  17 #include "webkit/browser/fileapi/file_system_context.h"
  18 #include "webkit/browser/fileapi/file_system_operation_context.h"
  19 #include "webkit/browser/fileapi/file_system_url.h"
  20 #include "webkit/browser/fileapi/file_system_usage_cache.h"
  21 #include "webkit/browser/fileapi/obfuscated_file_util.h"
  22 #include "webkit/browser/fileapi/quota/quota_backend_impl.h"
  23 #include "webkit/browser/fileapi/quota/quota_reservation.h"
  24 #include "webkit/browser/fileapi/quota/quota_reservation_manager.h"
  25 #include "webkit/browser/fileapi/sandbox_file_stream_writer.h"
  26 #include "webkit/browser/fileapi/sandbox_file_system_backend.h"
  27 #include "webkit/browser/fileapi/sandbox_quota_observer.h"
  28 #include "webkit/browser/quota/quota_manager_proxy.h"
  29 #include "webkit/common/fileapi/file_system_util.h"
  30
  31 namespace fileapi {
  32
  33 namespace {
  34
  35 const char kTemporaryOriginsCountLabel[] = "FileSystem.TemporaryOriginsCount";
  36 const char kPersistentOriginsCountLabel[] = "FileSystem.PersistentOriginsCount";
  37
  38 const char kOpenFileSystemLabel[] = "FileSystem.OpenFileSystem";
  39 const char kOpenFileSystemDetailLabel[] = "FileSystem.OpenFileSystemDetail";
  40 const char kOpenFileSystemDetailNonThrottledLabel[] =
  41     "FileSystem.OpenFileSystemDetailNonthrottled";
  42 int64 kMinimumStatsCollectionIntervalHours = 1;
  43
  44 // For type directory names in ObfuscatedFileUtil.
  45 // TODO(kinuko,nhiroki): Each type string registration should be done
  46 // via its own backend.
  47 const char kTemporaryDirectoryName[] = "t";
  48 const char kPersistentDirectoryName[] = "p";
  49 const char kSyncableDirectoryName[] = "s";
  50
  51 const char* kPrepopulateTypes[] = {
  52   kPersistentDirectoryName,
  53   kTemporaryDirectoryName
  54 };
  55
  56 enum FileSystemError {
  57   kOK = 0,
  58   kIncognito,
  59   kInvalidSchemeError,
  60   kCreateDirectoryError,
  61   kNotFound,
  62   kUnknownError,
  63   kFileSystemErrorMax,
  64 };
  65
  66 // Restricted names.
  67 // http://dev.w3.org/2009/dap/file-system/file-dir-sys.html#naming-restrictions
  68 const base::FilePath::CharType* const kRestrictedNames[] = {
  69   FILE_PATH_LITERAL("."), FILE_PATH_LITERAL(".."),
  70 };
  71
  72 // Restricted chars.
  73 const base::FilePath::CharType kRestrictedChars[] = {
  74   FILE_PATH_LITERAL('/'), FILE_PATH_LITERAL('\\'),
  75 };
  76
  77 std::string GetTypeStringForURL(const FileSystemURL& url) {
  78   return SandboxFileSystemBackendDelegate::GetTypeString(url.type());
  79 }
  80
  81 std::set<std::string> GetKnownTypeStrings() {
  82   std::set<std::string> known_type_strings;
  83   known_type_strings.insert(kTemporaryDirectoryName);
  84   known_type_strings.insert(kPersistentDirectoryName);
  85   known_type_strings.insert(kSyncableDirectoryName);
  86   return known_type_strings;
  87 }
  88
  89 class ObfuscatedOriginEnumerator
  90     : public SandboxFileSystemBackendDelegate::OriginEnumerator {
  91  public:
  92   explicit ObfuscatedOriginEnumerator(ObfuscatedFileUtil* file_util) {
  93     enum_.reset(file_util->CreateOriginEnumerator());
  94   }
  95   virtual ~ObfuscatedOriginEnumerator() {}
  96
  97   virtual GURL Next() OVERRIDE {
  98     return enum_->Next();
  99   }
 100
 101   virtual bool HasFileSystemType(FileSystemType type) const OVERRIDE {
 102     return enum_->HasTypeDirectory(
 103         SandboxFileSystemBackendDelegate::GetTypeString(type));
 104   }
 105
 106  private:
 107   scoped_ptr<ObfuscatedFileUtil::AbstractOriginEnumerator> enum_;
 108 };
 109
 110 void OpenFileSystemOnFileTaskRunner(
 111     ObfuscatedFileUtil* file_util,
 112     const GURL& origin_url,
 113     FileSystemType type,
 114     OpenFileSystemMode mode,
 115     base::File::Error* error_ptr) {
 116   DCHECK(error_ptr);
 117   const bool create = (mode == OPEN_FILE_SYSTEM_CREATE_IF_NONEXISTENT);
 118   file_util->GetDirectoryForOriginAndType(
 119       origin_url, SandboxFileSystemBackendDelegate::GetTypeString(type),
 120       create, error_ptr);
 121   if (*error_ptr != base::File::FILE_OK) {
 122     UMA_HISTOGRAM_ENUMERATION(kOpenFileSystemLabel,
 123                               kCreateDirectoryError,
 124                               kFileSystemErrorMax);
 125   } else {
 126     UMA_HISTOGRAM_ENUMERATION(kOpenFileSystemLabel, kOK, kFileSystemErrorMax);
 127   }
 128   // The reference of file_util will be derefed on the FILE thread
 129   // when the storage of this callback gets deleted regardless of whether
 130   // this method is called or not.
 131 }
 132
 133 void DidOpenFileSystem(
 134     base::WeakPtr<SandboxFileSystemBackendDelegate> delegate,
 135     const base::Callback<void(base::File::Error error)>& callback,
 136     base::File::Error* error) {
 137   if (delegate.get())
 138     delegate.get()->CollectOpenFileSystemMetrics(*error);
 139   callback.Run(*error);
 140 }
 141
 142 template <typename T>
 143 void DeleteSoon(base::SequencedTaskRunner* runner, T* ptr) {
 144   if (!runner->DeleteSoon(FROM_HERE, ptr))
 145     delete ptr;
 146 }
 147
 148 }  // namespace
 149
 150 const base::FilePath::CharType
 151 SandboxFileSystemBackendDelegate::kFileSystemDirectory[] =
 152     FILE_PATH_LITERAL("File System");
 153
 154 // static
 155 std::string SandboxFileSystemBackendDelegate::GetTypeString(
 156     FileSystemType type) {
 157   switch (type) {
 158     case kFileSystemTypeTemporary:
 159       return kTemporaryDirectoryName;
 160     case kFileSystemTypePersistent:
 161       return kPersistentDirectoryName;
 162     case kFileSystemTypeSyncable:
 163     case kFileSystemTypeSyncableForInternalSync:
 164       return kSyncableDirectoryName;
 165     case kFileSystemTypeUnknown:
 166     default:
 167       NOTREACHED() << "Unknown filesystem type requested:" << type;
 168       return std::string();
 169   }
 170 }
 171
 172 SandboxFileSystemBackendDelegate::SandboxFileSystemBackendDelegate(
 173     quota::QuotaManagerProxy* quota_manager_proxy,
 174     base::SequencedTaskRunner* file_task_runner,
 175     const base::FilePath& profile_path,
 176     quota::SpecialStoragePolicy* special_storage_policy,
 177     const FileSystemOptions& file_system_options)
 178     : file_task_runner_(file_task_runner),
 179       sandbox_file_util_(new AsyncFileUtilAdapter(
 180           new ObfuscatedFileUtil(
 181               special_storage_policy,
 182               profile_path.Append(kFileSystemDirectory),
 183               file_system_options.env_override(),
 184               file_task_runner,
 185               base::Bind(&GetTypeStringForURL),
 186               GetKnownTypeStrings(),
 187               this))),
 188       file_system_usage_cache_(new FileSystemUsageCache(file_task_runner)),
 189       quota_observer_(new SandboxQuotaObserver(
 190           quota_manager_proxy,
 191           file_task_runner,
 192           obfuscated_file_util(),
 193           usage_cache())),
 194       quota_reservation_manager_(new QuotaReservationManager(
 195           scoped_ptr<QuotaReservationManager::QuotaBackend>(
 196               new QuotaBackendImpl(file_task_runner_,
 197                                    obfuscated_file_util(),
 198                                    usage_cache(),
 199                                    quota_manager_proxy)))),
 200       special_storage_policy_(special_storage_policy),
 201       file_system_options_(file_system_options),
 202       is_filesystem_opened_(false),
 203       weak_factory_(this) {
 204   // Prepopulate database only if it can run asynchronously (i.e. the current
 205   // thread is not file_task_runner). Usually this is the case but may not
 206   // in test code.
 207   if (!file_system_options.is_incognito() &&
 208       !file_task_runner_->RunsTasksOnCurrentThread()) {
 209     std::vector<std::string> types_to_prepopulate(
 210         &kPrepopulateTypes[0],
 211         &kPrepopulateTypes[arraysize(kPrepopulateTypes)]);
 212     file_task_runner_->PostTask(
 213         FROM_HERE,
 214         base::Bind(&ObfuscatedFileUtil::MaybePrepopulateDatabase,
 215                   base::Unretained(obfuscated_file_util()),
 216                   types_to_prepopulate));
 217   }
 218 }
 219
 220 SandboxFileSystemBackendDelegate::~SandboxFileSystemBackendDelegate() {
 221   io_thread_checker_.DetachFromThread();
 222
 223   if (!file_task_runner_->RunsTasksOnCurrentThread()) {
 224     DeleteSoon(file_task_runner_.get(), quota_reservation_manager_.release());
 225     DeleteSoon(file_task_runner_.get(), sandbox_file_util_.release());
 226     DeleteSoon(file_task_runner_.get(), quota_observer_.release());
 227     DeleteSoon(file_task_runner_.get(), file_system_usage_cache_.release());
 228   }
 229 }
 230
 231 SandboxFileSystemBackendDelegate::OriginEnumerator*
 232 SandboxFileSystemBackendDelegate::CreateOriginEnumerator() {
 233   return new ObfuscatedOriginEnumerator(obfuscated_file_util());
 234 }
 235
 236 base::FilePath
 237 SandboxFileSystemBackendDelegate::GetBaseDirectoryForOriginAndType(
 238     const GURL& origin_url,
 239     FileSystemType type,
 240     bool create) {
 241   base::File::Error error = base::File::FILE_OK;
 242   base::FilePath path = obfuscated_file_util()->GetDirectoryForOriginAndType(
 243       origin_url, GetTypeString(type), create, &error);
 244   if (error != base::File::FILE_OK)
 245     return base::FilePath();
 246   return path;
 247 }
 248
 249 void SandboxFileSystemBackendDelegate::OpenFileSystem(
 250     const GURL& origin_url,
 251     FileSystemType type,
 252     OpenFileSystemMode mode,
 253     const OpenFileSystemCallback& callback,
 254     const GURL& root_url) {
 255   if (!IsAllowedScheme(origin_url)) {
 256     callback.Run(GURL(), std::string(), base::File::FILE_ERROR_SECURITY);
 257     return;
 258   }
 259
 260   std::string name = GetFileSystemName(origin_url, type);
 261
 262   base::File::Error* error_ptr = new base::File::Error;
 263   file_task_runner_->PostTaskAndReply(
 264       FROM_HERE,
 265       base::Bind(&OpenFileSystemOnFileTaskRunner,
 266                  obfuscated_file_util(), origin_url, type, mode,
 267                  base::Unretained(error_ptr)),
 268       base::Bind(&DidOpenFileSystem,
 269                  weak_factory_.GetWeakPtr(),
 270                  base::Bind(callback, root_url, name),
 271                  base::Owned(error_ptr)));
 272
 273   io_thread_checker_.DetachFromThread();
 274   is_filesystem_opened_ = true;
 275 }
 276
 277 scoped_ptr<FileSystemOperationContext>
 278 SandboxFileSystemBackendDelegate::CreateFileSystemOperationContext(
 279     const FileSystemURL& url,
 280     FileSystemContext* context,
 281     base::File::Error* error_code) const {
 282   if (!IsAccessValid(url)) {
 283     *error_code = base::File::FILE_ERROR_SECURITY;
 284     return scoped_ptr<FileSystemOperationContext>();
 285   }
 286
 287   const UpdateObserverList* update_observers = GetUpdateObservers(url.type());
 288   const ChangeObserverList* change_observers = GetChangeObservers(url.type());
 289   DCHECK(update_observers);
 290
 291   scoped_ptr<FileSystemOperationContext> operation_context(
 292       new FileSystemOperationContext(context));
 293   operation_context->set_update_observers(*update_observers);
 294   operation_context->set_change_observers(
 295       change_observers ? *change_observers : ChangeObserverList());
 296
 297   return operation_context.Pass();
 298 }
 299
 300 scoped_ptr<webkit_blob::FileStreamReader>
 301 SandboxFileSystemBackendDelegate::CreateFileStreamReader(
 302     const FileSystemURL& url,
 303     int64 offset,
 304     const base::Time& expected_modification_time,
 305     FileSystemContext* context) const {
 306   if (!IsAccessValid(url))
 307     return scoped_ptr<webkit_blob::FileStreamReader>();
 308   return scoped_ptr<webkit_blob::FileStreamReader>(
 309       webkit_blob::FileStreamReader::CreateForFileSystemFile(
 310           context, url, offset, expected_modification_time));
 311 }
 312
 313 scoped_ptr<FileStreamWriter>
 314 SandboxFileSystemBackendDelegate::CreateFileStreamWriter(
 315     const FileSystemURL& url,
 316     int64 offset,
 317     FileSystemContext* context,
 318     FileSystemType type) const {
 319   if (!IsAccessValid(url))
 320     return scoped_ptr<FileStreamWriter>();
 321   const UpdateObserverList* observers = GetUpdateObservers(type);
 322   DCHECK(observers);
 323   return scoped_ptr<FileStreamWriter>(
 324       new SandboxFileStreamWriter(context, url, offset, *observers));
 325 }
 326
 327 base::File::Error
 328 SandboxFileSystemBackendDelegate::DeleteOriginDataOnFileTaskRunner(
 329     FileSystemContext* file_system_context,
 330     quota::QuotaManagerProxy* proxy,
 331     const GURL& origin_url,
 332     FileSystemType type) {
 333   DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
 334   int64 usage = GetOriginUsageOnFileTaskRunner(
 335       file_system_context, origin_url, type);
 336   usage_cache()->CloseCacheFiles();
 337   bool result = obfuscated_file_util()->DeleteDirectoryForOriginAndType(
 338       origin_url, GetTypeString(type));
 339   if (result && proxy) {
 340     proxy->NotifyStorageModified(
 341         quota::QuotaClient::kFileSystem,
 342         origin_url,
 343         FileSystemTypeToQuotaStorageType(type),
 344         -usage);
 345   }
 346
 347   if (result)
 348     return base::File::FILE_OK;
 349   return base::File::FILE_ERROR_FAILED;
 350 }
 351
 352 void SandboxFileSystemBackendDelegate::GetOriginsForTypeOnFileTaskRunner(
 353     FileSystemType type, std::set<GURL>* origins) {
 354   DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
 355   DCHECK(origins);
 356   scoped_ptr<OriginEnumerator> enumerator(CreateOriginEnumerator());
 357   GURL origin;
 358   while (!(origin = enumerator->Next()).is_empty()) {
 359     if (enumerator->HasFileSystemType(type))
 360       origins->insert(origin);
 361   }
 362   switch (type) {
 363     case kFileSystemTypeTemporary:
 364       UMA_HISTOGRAM_COUNTS(kTemporaryOriginsCountLabel, origins->size());
 365       break;
 366     case kFileSystemTypePersistent:
 367       UMA_HISTOGRAM_COUNTS(kPersistentOriginsCountLabel, origins->size());
 368       break;
 369     default:
 370       break;
 371   }
 372 }
 373
 374 void SandboxFileSystemBackendDelegate::GetOriginsForHostOnFileTaskRunner(
 375     FileSystemType type, const std::string& host,
 376     std::set<GURL>* origins) {
 377   DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
 378   DCHECK(origins);
 379   scoped_ptr<OriginEnumerator> enumerator(CreateOriginEnumerator());
 380   GURL origin;
 381   while (!(origin = enumerator->Next()).is_empty()) {
 382     if (host == net::GetHostOrSpecFromURL(origin) &&
 383         enumerator->HasFileSystemType(type))
 384       origins->insert(origin);
 385   }
 386 }
 387
 388 int64 SandboxFileSystemBackendDelegate::GetOriginUsageOnFileTaskRunner(
 389     FileSystemContext* file_system_context,
 390     const GURL& origin_url,
 391     FileSystemType type) {
 392   DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
 393
 394   // Don't use usage cache and return recalculated usage for sticky invalidated
 395   // origins.
 396   if (ContainsKey(sticky_dirty_origins_, std::make_pair(origin_url, type)))
 397     return RecalculateUsage(file_system_context, origin_url, type);
 398
 399   base::FilePath base_path =
 400       GetBaseDirectoryForOriginAndType(origin_url, type, false);
 401   if (base_path.empty() || !base::DirectoryExists(base_path))
 402     return 0;
 403   base::FilePath usage_file_path =
 404       base_path.Append(FileSystemUsageCache::kUsageFileName);
 405
 406   bool is_valid = usage_cache()->IsValid(usage_file_path);
 407   uint32 dirty_status = 0;
 408   bool dirty_status_available =
 409       usage_cache()->GetDirty(usage_file_path, &dirty_status);
 410   bool visited = !visited_origins_.insert(origin_url).second;
 411   if (is_valid && (dirty_status == 0 || (dirty_status_available && visited))) {
 412     // The usage cache is clean (dirty == 0) or the origin is already
 413     // initialized and running.  Read the cache file to get the usage.
 414     int64 usage = 0;
 415     return usage_cache()->GetUsage(usage_file_path, &usage) ? usage : -1;
 416   }
 417   // The usage cache has not been initialized or the cache is dirty.
 418   // Get the directory size now and update the cache.
 419   usage_cache()->Delete(usage_file_path);
 420
 421   int64 usage = RecalculateUsage(file_system_context, origin_url, type);
 422
 423   // This clears the dirty flag too.
 424   usage_cache()->UpdateUsage(usage_file_path, usage);
 425   return usage;
 426 }
 427
 428 scoped_refptr<QuotaReservation>
 429 SandboxFileSystemBackendDelegate::CreateQuotaReservationOnFileTaskRunner(
 430     const GURL& origin,
 431     FileSystemType type) {
 432   DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
 433   DCHECK(quota_reservation_manager_);
 434   return quota_reservation_manager_->CreateReservation(origin, type);
 435 }
 436
 437 void SandboxFileSystemBackendDelegate::AddFileUpdateObserver(
 438     FileSystemType type,
 439     FileUpdateObserver* observer,
 440     base::SequencedTaskRunner* task_runner) {
 441   DCHECK(!is_filesystem_opened_ || io_thread_checker_.CalledOnValidThread());
 442   update_observers_[type] =
 443       update_observers_[type].AddObserver(observer, task_runner);
 444 }
 445
 446 void SandboxFileSystemBackendDelegate::AddFileChangeObserver(
 447     FileSystemType type,
 448     FileChangeObserver* observer,
 449     base::SequencedTaskRunner* task_runner) {
 450   DCHECK(!is_filesystem_opened_ || io_thread_checker_.CalledOnValidThread());
 451   change_observers_[type] =
 452       change_observers_[type].AddObserver(observer, task_runner);
 453 }
 454
 455 void SandboxFileSystemBackendDelegate::AddFileAccessObserver(
 456     FileSystemType type,
 457     FileAccessObserver* observer,
 458     base::SequencedTaskRunner* task_runner) {
 459   DCHECK(!is_filesystem_opened_ || io_thread_checker_.CalledOnValidThread());
 460   access_observers_[type] =
 461       access_observers_[type].AddObserver(observer, task_runner);
 462 }
 463
 464 const UpdateObserverList* SandboxFileSystemBackendDelegate::GetUpdateObservers(
 465     FileSystemType type) const {
 466   std::map<FileSystemType, UpdateObserverList>::const_iterator iter =
 467       update_observers_.find(type);
 468   if (iter == update_observers_.end())
 469     return NULL;
 470   return &iter->second;
 471 }
 472
 473 const ChangeObserverList* SandboxFileSystemBackendDelegate::GetChangeObservers(
 474     FileSystemType type) const {
 475   std::map<FileSystemType, ChangeObserverList>::const_iterator iter =
 476       change_observers_.find(type);
 477   if (iter == change_observers_.end())
 478     return NULL;
 479   return &iter->second;
 480 }
 481
 482 const AccessObserverList* SandboxFileSystemBackendDelegate::GetAccessObservers(
 483     FileSystemType type) const {
 484   std::map<FileSystemType, AccessObserverList>::const_iterator iter =
 485       access_observers_.find(type);
 486   if (iter == access_observers_.end())
 487     return NULL;
 488   return &iter->second;
 489 }
 490
 491 void SandboxFileSystemBackendDelegate::RegisterQuotaUpdateObserver(
 492     FileSystemType type) {
 493   AddFileUpdateObserver(type, quota_observer_.get(), file_task_runner_.get());
 494 }
 495
 496 void SandboxFileSystemBackendDelegate::InvalidateUsageCache(
 497     const GURL& origin,
 498     FileSystemType type) {
 499   base::File::Error error = base::File::FILE_OK;
 500   base::FilePath usage_file_path = GetUsageCachePathForOriginAndType(
 501       obfuscated_file_util(), origin, type, &error);
 502   if (error != base::File::FILE_OK)
 503     return;
 504   usage_cache()->IncrementDirty(usage_file_path);
 505 }
 506
 507 void SandboxFileSystemBackendDelegate::StickyInvalidateUsageCache(
 508     const GURL& origin,
 509     FileSystemType type) {
 510   sticky_dirty_origins_.insert(std::make_pair(origin, type));
 511   quota_observer()->SetUsageCacheEnabled(origin, type, false);
 512   InvalidateUsageCache(origin, type);
 513 }
 514
 515 FileSystemFileUtil* SandboxFileSystemBackendDelegate::sync_file_util() {
 516   return static_cast<AsyncFileUtilAdapter*>(file_util())->sync_file_util();
 517 }
 518
 519 bool SandboxFileSystemBackendDelegate::IsAccessValid(
 520     const FileSystemURL& url) const {
 521   if (!IsAllowedScheme(url.origin()))
 522     return false;
 523
 524   if (url.path().ReferencesParent())
 525     return false;
 526
 527   // Return earlier if the path is '/', because VirtualPath::BaseName()
 528   // returns '/' for '/' and we fail the "basename != '/'" check below.
 529   // (We exclude '.' because it's disallowed by spec.)
 530   if (VirtualPath::IsRootPath(url.path()) &&
 531       url.path() != base::FilePath(base::FilePath::kCurrentDirectory))
 532     return true;
 533
 534   // Restricted names specified in
 535   // http://dev.w3.org/2009/dap/file-system/file-dir-sys.html#naming-restrictions
 536   base::FilePath filename = VirtualPath::BaseName(url.path());
 537   // See if the name is allowed to create.
 538   for (size_t i = 0; i < arraysize(kRestrictedNames); ++i) {
 539     if (filename.value() == kRestrictedNames[i])
 540       return false;
 541   }
 542   for (size_t i = 0; i < arraysize(kRestrictedChars); ++i) {
 543     if (filename.value().find(kRestrictedChars[i]) !=
 544         base::FilePath::StringType::npos)
 545       return false;
 546   }
 547
 548   return true;
 549 }
 550
 551 bool SandboxFileSystemBackendDelegate::IsAllowedScheme(const GURL& url) const {
 552   // Basically we only accept http or https. We allow file:// URLs
 553   // only if --allow-file-access-from-files flag is given.
 554   if (url.SchemeIsHTTPOrHTTPS())
 555     return true;
 556   if (url.SchemeIsFileSystem())
 557     return url.inner_url() && IsAllowedScheme(*url.inner_url());
 558
 559   for (size_t i = 0;
 560        i < file_system_options_.additional_allowed_schemes().size();
 561        ++i) {
 562     if (url.SchemeIs(
 563             file_system_options_.additional_allowed_schemes()[i].c_str()))
 564       return true;
 565   }
 566   return false;
 567 }
 568
 569 base::FilePath
 570 SandboxFileSystemBackendDelegate::GetUsageCachePathForOriginAndType(
 571     const GURL& origin_url,
 572     FileSystemType type) {
 573   base::File::Error error;
 574   base::FilePath path = GetUsageCachePathForOriginAndType(
 575       obfuscated_file_util(), origin_url, type, &error);
 576   if (error != base::File::FILE_OK)
 577     return base::FilePath();
 578   return path;
 579 }
 580
 581 // static
 582 base::FilePath
 583 SandboxFileSystemBackendDelegate::GetUsageCachePathForOriginAndType(
 584     ObfuscatedFileUtil* sandbox_file_util,
 585     const GURL& origin_url,
 586     FileSystemType type,
 587     base::File::Error* error_out) {
 588   DCHECK(error_out);
 589   *error_out = base::File::FILE_OK;
 590   base::FilePath base_path = sandbox_file_util->GetDirectoryForOriginAndType(
 591       origin_url, GetTypeString(type), false /* create */, error_out);
 592   if (*error_out != base::File::FILE_OK)
 593     return base::FilePath();
 594   return base_path.Append(FileSystemUsageCache::kUsageFileName);
 595 }
 596
 597 int64 SandboxFileSystemBackendDelegate::RecalculateUsage(
 598     FileSystemContext* context,
 599     const GURL& origin,
 600     FileSystemType type) {
 601   FileSystemOperationContext operation_context(context);
 602   FileSystemURL url = context->CreateCrackedFileSystemURL(
 603       origin, type, base::FilePath());
 604   scoped_ptr<FileSystemFileUtil::AbstractFileEnumerator> enumerator(
 605       obfuscated_file_util()->CreateFileEnumerator(
 606           &operation_context, url, true));
 607
 608   base::FilePath file_path_each;
 609   int64 usage = 0;
 610
 611   while (!(file_path_each = enumerator->Next()).empty()) {
 612     usage += enumerator->Size();
 613     usage += ObfuscatedFileUtil::ComputeFilePathCost(file_path_each);
 614   }
 615
 616   return usage;
 617 }
 618
 619 void SandboxFileSystemBackendDelegate::CollectOpenFileSystemMetrics(
 620     base::File::Error error_code) {
 621   base::Time now = base::Time::Now();
 622   bool throttled = now < next_release_time_for_open_filesystem_stat_;
 623   if (!throttled) {
 624     next_release_time_for_open_filesystem_stat_ =
 625         now + base::TimeDelta::FromHours(kMinimumStatsCollectionIntervalHours);
 626   }
 627
 628 #define REPORT(report_value)                                            \
 629   UMA_HISTOGRAM_ENUMERATION(kOpenFileSystemDetailLabel,                 \
 630                             (report_value),                             \
 631                             kFileSystemErrorMax);                       \
 632   if (!throttled) {                                                     \
 633     UMA_HISTOGRAM_ENUMERATION(kOpenFileSystemDetailNonThrottledLabel,   \
 634                               (report_value),                           \
 635                               kFileSystemErrorMax);                     \
 636   }
 637
 638   switch (error_code) {
 639     case base::File::FILE_OK:
 640       REPORT(kOK);
 641       break;
 642     case base::File::FILE_ERROR_INVALID_URL:
 643       REPORT(kInvalidSchemeError);
 644       break;
 645     case base::File::FILE_ERROR_NOT_FOUND:
 646       REPORT(kNotFound);
 647       break;
 648     case base::File::FILE_ERROR_FAILED:
 649     default:
 650       REPORT(kUnknownError);
 651       break;
 652   }
 653 #undef REPORT
 654 }
 655
 656 ObfuscatedFileUtil* SandboxFileSystemBackendDelegate::obfuscated_file_util() {
 657   return static_cast<ObfuscatedFileUtil*>(sync_file_util());
 658 }
 659
 660 // Declared in obfuscated_file_util.h.
 661 // static
 662 ObfuscatedFileUtil* ObfuscatedFileUtil::CreateForTesting(
 663     quota::SpecialStoragePolicy* special_storage_policy,
 664     const base::FilePath& file_system_directory,
 665     leveldb::Env* env_override,
 666     base::SequencedTaskRunner* file_task_runner) {
 667   return new ObfuscatedFileUtil(special_storage_policy,
 668                                 file_system_directory,
 669                                 env_override,
 670                                 file_task_runner,
 671                                 base::Bind(&GetTypeStringForURL),
 672                                 GetKnownTypeStrings(),
 673                                 NULL);
 674 }
 675
 676 }  // namespace fileapi