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Side by Side Diff: webkit/browser/fileapi/obfuscated_file_util.cc

Issue 539143002: Migrate webkit/browser/ to storage/browser/ (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 6 years, 3 months ago
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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 "webkit/browser/fileapi/obfuscated_file_util.h"
6
7 #include <queue>
8 #include <string>
9 #include <vector>
10
11 #include "base/file_util.h"
12 #include "base/format_macros.h"
13 #include "base/logging.h"
14 #include "base/message_loop/message_loop.h"
15 #include "base/metrics/histogram.h"
16 #include "base/stl_util.h"
17 #include "base/strings/string_number_conversions.h"
18 #include "base/strings/stringprintf.h"
19 #include "base/strings/sys_string_conversions.h"
20 #include "base/strings/utf_string_conversions.h"
21 #include "base/time/time.h"
22 #include "url/gurl.h"
23 #include "webkit/browser/fileapi/file_observers.h"
24 #include "webkit/browser/fileapi/file_system_context.h"
25 #include "webkit/browser/fileapi/file_system_operation_context.h"
26 #include "webkit/browser/fileapi/file_system_url.h"
27 #include "webkit/browser/fileapi/native_file_util.h"
28 #include "webkit/browser/fileapi/sandbox_file_system_backend.h"
29 #include "webkit/browser/fileapi/sandbox_isolated_origin_database.h"
30 #include "webkit/browser/fileapi/sandbox_origin_database.h"
31 #include "webkit/browser/fileapi/sandbox_prioritized_origin_database.h"
32 #include "webkit/browser/fileapi/timed_task_helper.h"
33 #include "webkit/browser/quota/quota_manager.h"
34 #include "webkit/common/database/database_identifier.h"
35 #include "webkit/common/fileapi/file_system_util.h"
36
37 // Example of various paths:
38 // void ObfuscatedFileUtil::DoSomething(const FileSystemURL& url) {
39 // base::FilePath virtual_path = url.path();
40 // base::FilePath local_path = GetLocalFilePath(url);
41 //
42 // NativeFileUtil::DoSomething(local_path);
43 // file_util::DoAnother(local_path);
44 // }
45
46 namespace storage {
47
48 namespace {
49
50 typedef SandboxDirectoryDatabase::FileId FileId;
51 typedef SandboxDirectoryDatabase::FileInfo FileInfo;
52
53 void InitFileInfo(
54 SandboxDirectoryDatabase::FileInfo* file_info,
55 SandboxDirectoryDatabase::FileId parent_id,
56 const base::FilePath::StringType& file_name) {
57 DCHECK(file_info);
58 file_info->parent_id = parent_id;
59 file_info->name = file_name;
60 }
61
62 // Costs computed as per crbug.com/86114, based on the LevelDB implementation of
63 // path storage under Linux. It's not clear if that will differ on Windows, on
64 // which base::FilePath uses wide chars [since they're converted to UTF-8 for
65 // storage anyway], but as long as the cost is high enough that one can't cheat
66 // on quota by storing data in paths, it doesn't need to be all that accurate.
67 const int64 kPathCreationQuotaCost = 146; // Bytes per inode, basically.
68 const int64 kPathByteQuotaCost = 2; // Bytes per byte of path length in UTF-8.
69
70 int64 UsageForPath(size_t length) {
71 return kPathCreationQuotaCost +
72 static_cast<int64>(length) * kPathByteQuotaCost;
73 }
74
75 bool AllocateQuota(FileSystemOperationContext* context, int64 growth) {
76 if (context->allowed_bytes_growth() == storage::QuotaManager::kNoLimit)
77 return true;
78
79 int64 new_quota = context->allowed_bytes_growth() - growth;
80 if (growth > 0 && new_quota < 0)
81 return false;
82 context->set_allowed_bytes_growth(new_quota);
83 return true;
84 }
85
86 void UpdateUsage(
87 FileSystemOperationContext* context,
88 const FileSystemURL& url,
89 int64 growth) {
90 context->update_observers()->Notify(
91 &FileUpdateObserver::OnUpdate, MakeTuple(url, growth));
92 }
93
94 void TouchDirectory(SandboxDirectoryDatabase* db, FileId dir_id) {
95 DCHECK(db);
96 if (!db->UpdateModificationTime(dir_id, base::Time::Now()))
97 NOTREACHED();
98 }
99
100 enum IsolatedOriginStatus {
101 kIsolatedOriginMatch,
102 kIsolatedOriginDontMatch,
103 kIsolatedOriginStatusMax,
104 };
105
106 } // namespace
107
108 class ObfuscatedFileEnumerator
109 : public FileSystemFileUtil::AbstractFileEnumerator {
110 public:
111 ObfuscatedFileEnumerator(
112 SandboxDirectoryDatabase* db,
113 FileSystemOperationContext* context,
114 ObfuscatedFileUtil* obfuscated_file_util,
115 const FileSystemURL& root_url,
116 bool recursive)
117 : db_(db),
118 context_(context),
119 obfuscated_file_util_(obfuscated_file_util),
120 root_url_(root_url),
121 recursive_(recursive),
122 current_file_id_(0) {
123 base::FilePath root_virtual_path = root_url.path();
124 FileId file_id;
125
126 if (!db_->GetFileWithPath(root_virtual_path, &file_id))
127 return;
128
129 FileRecord record = { file_id, root_virtual_path };
130 recurse_queue_.push(record);
131 }
132
133 virtual ~ObfuscatedFileEnumerator() {}
134
135 virtual base::FilePath Next() OVERRIDE {
136 ProcessRecurseQueue();
137 if (display_stack_.empty())
138 return base::FilePath();
139
140 current_file_id_ = display_stack_.back();
141 display_stack_.pop_back();
142
143 FileInfo file_info;
144 base::FilePath platform_file_path;
145 base::File::Error error =
146 obfuscated_file_util_->GetFileInfoInternal(
147 db_, context_, root_url_, current_file_id_,
148 &file_info, &current_platform_file_info_, &platform_file_path);
149 if (error != base::File::FILE_OK)
150 return Next();
151
152 base::FilePath virtual_path =
153 current_parent_virtual_path_.Append(file_info.name);
154 if (recursive_ && file_info.is_directory()) {
155 FileRecord record = { current_file_id_, virtual_path };
156 recurse_queue_.push(record);
157 }
158 return virtual_path;
159 }
160
161 virtual int64 Size() OVERRIDE {
162 return current_platform_file_info_.size;
163 }
164
165 virtual base::Time LastModifiedTime() OVERRIDE {
166 return current_platform_file_info_.last_modified;
167 }
168
169 virtual bool IsDirectory() OVERRIDE {
170 return current_platform_file_info_.is_directory;
171 }
172
173 private:
174 typedef SandboxDirectoryDatabase::FileId FileId;
175 typedef SandboxDirectoryDatabase::FileInfo FileInfo;
176
177 struct FileRecord {
178 FileId file_id;
179 base::FilePath virtual_path;
180 };
181
182 void ProcessRecurseQueue() {
183 while (display_stack_.empty() && !recurse_queue_.empty()) {
184 FileRecord entry = recurse_queue_.front();
185 recurse_queue_.pop();
186 if (!db_->ListChildren(entry.file_id, &display_stack_)) {
187 display_stack_.clear();
188 return;
189 }
190 current_parent_virtual_path_ = entry.virtual_path;
191 }
192 }
193
194 SandboxDirectoryDatabase* db_;
195 FileSystemOperationContext* context_;
196 ObfuscatedFileUtil* obfuscated_file_util_;
197 FileSystemURL root_url_;
198 bool recursive_;
199
200 std::queue<FileRecord> recurse_queue_;
201 std::vector<FileId> display_stack_;
202 base::FilePath current_parent_virtual_path_;
203
204 FileId current_file_id_;
205 base::File::Info current_platform_file_info_;
206 };
207
208 class ObfuscatedOriginEnumerator
209 : public ObfuscatedFileUtil::AbstractOriginEnumerator {
210 public:
211 typedef SandboxOriginDatabase::OriginRecord OriginRecord;
212 ObfuscatedOriginEnumerator(
213 SandboxOriginDatabaseInterface* origin_database,
214 const base::FilePath& base_file_path)
215 : base_file_path_(base_file_path) {
216 if (origin_database)
217 origin_database->ListAllOrigins(&origins_);
218 }
219
220 virtual ~ObfuscatedOriginEnumerator() {}
221
222 // Returns the next origin. Returns empty if there are no more origins.
223 virtual GURL Next() OVERRIDE {
224 OriginRecord record;
225 if (!origins_.empty()) {
226 record = origins_.back();
227 origins_.pop_back();
228 }
229 current_ = record;
230 return storage::GetOriginFromIdentifier(record.origin);
231 }
232
233 // Returns the current origin's information.
234 virtual bool HasTypeDirectory(const std::string& type_string) const OVERRIDE {
235 if (current_.path.empty())
236 return false;
237 if (type_string.empty()) {
238 NOTREACHED();
239 return false;
240 }
241 base::FilePath path =
242 base_file_path_.Append(current_.path).AppendASCII(type_string);
243 return base::DirectoryExists(path);
244 }
245
246 private:
247 std::vector<OriginRecord> origins_;
248 OriginRecord current_;
249 base::FilePath base_file_path_;
250 };
251
252 ObfuscatedFileUtil::ObfuscatedFileUtil(
253 storage::SpecialStoragePolicy* special_storage_policy,
254 const base::FilePath& file_system_directory,
255 leveldb::Env* env_override,
256 base::SequencedTaskRunner* file_task_runner,
257 const GetTypeStringForURLCallback& get_type_string_for_url,
258 const std::set<std::string>& known_type_strings,
259 SandboxFileSystemBackendDelegate* sandbox_delegate)
260 : special_storage_policy_(special_storage_policy),
261 file_system_directory_(file_system_directory),
262 env_override_(env_override),
263 db_flush_delay_seconds_(10 * 60), // 10 mins.
264 file_task_runner_(file_task_runner),
265 get_type_string_for_url_(get_type_string_for_url),
266 known_type_strings_(known_type_strings),
267 sandbox_delegate_(sandbox_delegate) {
268 }
269
270 ObfuscatedFileUtil::~ObfuscatedFileUtil() {
271 DropDatabases();
272 }
273
274 base::File ObfuscatedFileUtil::CreateOrOpen(
275 FileSystemOperationContext* context,
276 const FileSystemURL& url, int file_flags) {
277 base::File file = CreateOrOpenInternal(context, url, file_flags);
278 if (file.IsValid() && file_flags & base::File::FLAG_WRITE &&
279 context->quota_limit_type() == storage::kQuotaLimitTypeUnlimited &&
280 sandbox_delegate_) {
281 sandbox_delegate_->StickyInvalidateUsageCache(url.origin(), url.type());
282 }
283 return file.Pass();
284 }
285
286 base::File::Error ObfuscatedFileUtil::EnsureFileExists(
287 FileSystemOperationContext* context,
288 const FileSystemURL& url,
289 bool* created) {
290 SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, true);
291 if (!db)
292 return base::File::FILE_ERROR_FAILED;
293
294 FileId file_id;
295 if (db->GetFileWithPath(url.path(), &file_id)) {
296 FileInfo file_info;
297 if (!db->GetFileInfo(file_id, &file_info)) {
298 NOTREACHED();
299 return base::File::FILE_ERROR_FAILED;
300 }
301 if (file_info.is_directory())
302 return base::File::FILE_ERROR_NOT_A_FILE;
303 if (created)
304 *created = false;
305 return base::File::FILE_OK;
306 }
307 FileId parent_id;
308 if (!db->GetFileWithPath(VirtualPath::DirName(url.path()), &parent_id))
309 return base::File::FILE_ERROR_NOT_FOUND;
310
311 FileInfo file_info;
312 InitFileInfo(&file_info, parent_id,
313 VirtualPath::BaseName(url.path()).value());
314
315 int64 growth = UsageForPath(file_info.name.size());
316 if (!AllocateQuota(context, growth))
317 return base::File::FILE_ERROR_NO_SPACE;
318 base::File::Error error = CreateFile(context, base::FilePath(), url,
319 &file_info);
320 if (created && base::File::FILE_OK == error) {
321 *created = true;
322 UpdateUsage(context, url, growth);
323 context->change_observers()->Notify(
324 &FileChangeObserver::OnCreateFile, MakeTuple(url));
325 }
326 return error;
327 }
328
329 base::File::Error ObfuscatedFileUtil::CreateDirectory(
330 FileSystemOperationContext* context,
331 const FileSystemURL& url,
332 bool exclusive,
333 bool recursive) {
334 SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, true);
335 if (!db)
336 return base::File::FILE_ERROR_FAILED;
337
338 FileId file_id;
339 if (db->GetFileWithPath(url.path(), &file_id)) {
340 FileInfo file_info;
341 if (exclusive)
342 return base::File::FILE_ERROR_EXISTS;
343 if (!db->GetFileInfo(file_id, &file_info)) {
344 NOTREACHED();
345 return base::File::FILE_ERROR_FAILED;
346 }
347 if (!file_info.is_directory())
348 return base::File::FILE_ERROR_NOT_A_DIRECTORY;
349 return base::File::FILE_OK;
350 }
351
352 std::vector<base::FilePath::StringType> components;
353 VirtualPath::GetComponents(url.path(), &components);
354 FileId parent_id = 0;
355 size_t index;
356 for (index = 0; index < components.size(); ++index) {
357 base::FilePath::StringType name = components[index];
358 if (name == FILE_PATH_LITERAL("/"))
359 continue;
360 if (!db->GetChildWithName(parent_id, name, &parent_id))
361 break;
362 }
363 if (!db->IsDirectory(parent_id))
364 return base::File::FILE_ERROR_NOT_A_DIRECTORY;
365 if (!recursive && components.size() - index > 1)
366 return base::File::FILE_ERROR_NOT_FOUND;
367 bool first = true;
368 for (; index < components.size(); ++index) {
369 FileInfo file_info;
370 file_info.name = components[index];
371 if (file_info.name == FILE_PATH_LITERAL("/"))
372 continue;
373 file_info.modification_time = base::Time::Now();
374 file_info.parent_id = parent_id;
375 int64 growth = UsageForPath(file_info.name.size());
376 if (!AllocateQuota(context, growth))
377 return base::File::FILE_ERROR_NO_SPACE;
378 base::File::Error error = db->AddFileInfo(file_info, &parent_id);
379 if (error != base::File::FILE_OK)
380 return error;
381 UpdateUsage(context, url, growth);
382 context->change_observers()->Notify(
383 &FileChangeObserver::OnCreateDirectory, MakeTuple(url));
384 if (first) {
385 first = false;
386 TouchDirectory(db, file_info.parent_id);
387 }
388 }
389 return base::File::FILE_OK;
390 }
391
392 base::File::Error ObfuscatedFileUtil::GetFileInfo(
393 FileSystemOperationContext* context,
394 const FileSystemURL& url,
395 base::File::Info* file_info,
396 base::FilePath* platform_file_path) {
397 SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, false);
398 if (!db)
399 return base::File::FILE_ERROR_NOT_FOUND;
400 FileId file_id;
401 if (!db->GetFileWithPath(url.path(), &file_id))
402 return base::File::FILE_ERROR_NOT_FOUND;
403 FileInfo local_info;
404 return GetFileInfoInternal(db, context, url,
405 file_id, &local_info,
406 file_info, platform_file_path);
407 }
408
409 scoped_ptr<FileSystemFileUtil::AbstractFileEnumerator>
410 ObfuscatedFileUtil::CreateFileEnumerator(
411 FileSystemOperationContext* context,
412 const FileSystemURL& root_url) {
413 return CreateFileEnumerator(context, root_url, false /* recursive */);
414 }
415
416 base::File::Error ObfuscatedFileUtil::GetLocalFilePath(
417 FileSystemOperationContext* context,
418 const FileSystemURL& url,
419 base::FilePath* local_path) {
420 SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, false);
421 if (!db)
422 return base::File::FILE_ERROR_NOT_FOUND;
423 FileId file_id;
424 if (!db->GetFileWithPath(url.path(), &file_id))
425 return base::File::FILE_ERROR_NOT_FOUND;
426 FileInfo file_info;
427 if (!db->GetFileInfo(file_id, &file_info) || file_info.is_directory()) {
428 NOTREACHED();
429 // Directories have no local file path.
430 return base::File::FILE_ERROR_NOT_FOUND;
431 }
432 *local_path = DataPathToLocalPath(url, file_info.data_path);
433
434 if (local_path->empty())
435 return base::File::FILE_ERROR_NOT_FOUND;
436 return base::File::FILE_OK;
437 }
438
439 base::File::Error ObfuscatedFileUtil::Touch(
440 FileSystemOperationContext* context,
441 const FileSystemURL& url,
442 const base::Time& last_access_time,
443 const base::Time& last_modified_time) {
444 SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, false);
445 if (!db)
446 return base::File::FILE_ERROR_NOT_FOUND;
447 FileId file_id;
448 if (!db->GetFileWithPath(url.path(), &file_id))
449 return base::File::FILE_ERROR_NOT_FOUND;
450
451 FileInfo file_info;
452 if (!db->GetFileInfo(file_id, &file_info)) {
453 NOTREACHED();
454 return base::File::FILE_ERROR_FAILED;
455 }
456 if (file_info.is_directory()) {
457 if (!db->UpdateModificationTime(file_id, last_modified_time))
458 return base::File::FILE_ERROR_FAILED;
459 return base::File::FILE_OK;
460 }
461 return NativeFileUtil::Touch(
462 DataPathToLocalPath(url, file_info.data_path),
463 last_access_time, last_modified_time);
464 }
465
466 base::File::Error ObfuscatedFileUtil::Truncate(
467 FileSystemOperationContext* context,
468 const FileSystemURL& url,
469 int64 length) {
470 base::File::Info file_info;
471 base::FilePath local_path;
472 base::File::Error error =
473 GetFileInfo(context, url, &file_info, &local_path);
474 if (error != base::File::FILE_OK)
475 return error;
476
477 int64 growth = length - file_info.size;
478 if (!AllocateQuota(context, growth))
479 return base::File::FILE_ERROR_NO_SPACE;
480 error = NativeFileUtil::Truncate(local_path, length);
481 if (error == base::File::FILE_OK) {
482 UpdateUsage(context, url, growth);
483 context->change_observers()->Notify(
484 &FileChangeObserver::OnModifyFile, MakeTuple(url));
485 }
486 return error;
487 }
488
489 base::File::Error ObfuscatedFileUtil::CopyOrMoveFile(
490 FileSystemOperationContext* context,
491 const FileSystemURL& src_url,
492 const FileSystemURL& dest_url,
493 CopyOrMoveOption option,
494 bool copy) {
495 // Cross-filesystem copies and moves should be handled via CopyInForeignFile.
496 DCHECK(src_url.origin() == dest_url.origin());
497 DCHECK(src_url.type() == dest_url.type());
498
499 SandboxDirectoryDatabase* db = GetDirectoryDatabase(src_url, true);
500 if (!db)
501 return base::File::FILE_ERROR_FAILED;
502
503 FileId src_file_id;
504 if (!db->GetFileWithPath(src_url.path(), &src_file_id))
505 return base::File::FILE_ERROR_NOT_FOUND;
506
507 FileId dest_file_id;
508 bool overwrite = db->GetFileWithPath(dest_url.path(),
509 &dest_file_id);
510
511 FileInfo src_file_info;
512 base::File::Info src_platform_file_info;
513 base::FilePath src_local_path;
514 base::File::Error error = GetFileInfoInternal(
515 db, context, src_url, src_file_id,
516 &src_file_info, &src_platform_file_info, &src_local_path);
517 if (error != base::File::FILE_OK)
518 return error;
519 if (src_file_info.is_directory())
520 return base::File::FILE_ERROR_NOT_A_FILE;
521
522 FileInfo dest_file_info;
523 base::File::Info dest_platform_file_info; // overwrite case only
524 base::FilePath dest_local_path; // overwrite case only
525 if (overwrite) {
526 base::File::Error error = GetFileInfoInternal(
527 db, context, dest_url, dest_file_id,
528 &dest_file_info, &dest_platform_file_info, &dest_local_path);
529 if (error == base::File::FILE_ERROR_NOT_FOUND)
530 overwrite = false; // fallback to non-overwrite case
531 else if (error != base::File::FILE_OK)
532 return error;
533 else if (dest_file_info.is_directory())
534 return base::File::FILE_ERROR_INVALID_OPERATION;
535 }
536 if (!overwrite) {
537 FileId dest_parent_id;
538 if (!db->GetFileWithPath(VirtualPath::DirName(dest_url.path()),
539 &dest_parent_id)) {
540 return base::File::FILE_ERROR_NOT_FOUND;
541 }
542
543 dest_file_info = src_file_info;
544 dest_file_info.parent_id = dest_parent_id;
545 dest_file_info.name =
546 VirtualPath::BaseName(dest_url.path()).value();
547 }
548
549 int64 growth = 0;
550 if (copy)
551 growth += src_platform_file_info.size;
552 else
553 growth -= UsageForPath(src_file_info.name.size());
554 if (overwrite)
555 growth -= dest_platform_file_info.size;
556 else
557 growth += UsageForPath(dest_file_info.name.size());
558 if (!AllocateQuota(context, growth))
559 return base::File::FILE_ERROR_NO_SPACE;
560
561 /*
562 * Copy-with-overwrite
563 * Just overwrite data file
564 * Copy-without-overwrite
565 * Copy backing file
566 * Create new metadata pointing to new backing file.
567 * Move-with-overwrite
568 * transaction:
569 * Remove source entry.
570 * Point target entry to source entry's backing file.
571 * Delete target entry's old backing file
572 * Move-without-overwrite
573 * Just update metadata
574 */
575 error = base::File::FILE_ERROR_FAILED;
576 if (copy) {
577 if (overwrite) {
578 error = NativeFileUtil::CopyOrMoveFile(
579 src_local_path,
580 dest_local_path,
581 option,
582 storage::NativeFileUtil::CopyOrMoveModeForDestination(
583 dest_url, true /* copy */));
584 } else { // non-overwrite
585 error = CreateFile(context, src_local_path, dest_url, &dest_file_info);
586 }
587 } else {
588 if (overwrite) {
589 if (db->OverwritingMoveFile(src_file_id, dest_file_id)) {
590 if (base::File::FILE_OK !=
591 NativeFileUtil::DeleteFile(dest_local_path))
592 LOG(WARNING) << "Leaked a backing file.";
593 error = base::File::FILE_OK;
594 } else {
595 error = base::File::FILE_ERROR_FAILED;
596 }
597 } else { // non-overwrite
598 if (db->UpdateFileInfo(src_file_id, dest_file_info))
599 error = base::File::FILE_OK;
600 else
601 error = base::File::FILE_ERROR_FAILED;
602 }
603 }
604
605 if (error != base::File::FILE_OK)
606 return error;
607
608 if (overwrite) {
609 context->change_observers()->Notify(
610 &FileChangeObserver::OnModifyFile,
611 MakeTuple(dest_url));
612 } else {
613 context->change_observers()->Notify(
614 &FileChangeObserver::OnCreateFileFrom,
615 MakeTuple(dest_url, src_url));
616 }
617
618 if (!copy) {
619 context->change_observers()->Notify(
620 &FileChangeObserver::OnRemoveFile, MakeTuple(src_url));
621 TouchDirectory(db, src_file_info.parent_id);
622 }
623
624 TouchDirectory(db, dest_file_info.parent_id);
625
626 UpdateUsage(context, dest_url, growth);
627 return error;
628 }
629
630 base::File::Error ObfuscatedFileUtil::CopyInForeignFile(
631 FileSystemOperationContext* context,
632 const base::FilePath& src_file_path,
633 const FileSystemURL& dest_url) {
634 SandboxDirectoryDatabase* db = GetDirectoryDatabase(dest_url, true);
635 if (!db)
636 return base::File::FILE_ERROR_FAILED;
637
638 base::File::Info src_platform_file_info;
639 if (!base::GetFileInfo(src_file_path, &src_platform_file_info))
640 return base::File::FILE_ERROR_NOT_FOUND;
641
642 FileId dest_file_id;
643 bool overwrite = db->GetFileWithPath(dest_url.path(),
644 &dest_file_id);
645
646 FileInfo dest_file_info;
647 base::File::Info dest_platform_file_info; // overwrite case only
648 if (overwrite) {
649 base::FilePath dest_local_path;
650 base::File::Error error = GetFileInfoInternal(
651 db, context, dest_url, dest_file_id,
652 &dest_file_info, &dest_platform_file_info, &dest_local_path);
653 if (error == base::File::FILE_ERROR_NOT_FOUND)
654 overwrite = false; // fallback to non-overwrite case
655 else if (error != base::File::FILE_OK)
656 return error;
657 else if (dest_file_info.is_directory())
658 return base::File::FILE_ERROR_INVALID_OPERATION;
659 }
660 if (!overwrite) {
661 FileId dest_parent_id;
662 if (!db->GetFileWithPath(VirtualPath::DirName(dest_url.path()),
663 &dest_parent_id)) {
664 return base::File::FILE_ERROR_NOT_FOUND;
665 }
666 if (!dest_file_info.is_directory())
667 return base::File::FILE_ERROR_FAILED;
668 InitFileInfo(&dest_file_info, dest_parent_id,
669 VirtualPath::BaseName(dest_url.path()).value());
670 }
671
672 int64 growth = src_platform_file_info.size;
673 if (overwrite)
674 growth -= dest_platform_file_info.size;
675 else
676 growth += UsageForPath(dest_file_info.name.size());
677 if (!AllocateQuota(context, growth))
678 return base::File::FILE_ERROR_NO_SPACE;
679
680 base::File::Error error;
681 if (overwrite) {
682 base::FilePath dest_local_path =
683 DataPathToLocalPath(dest_url, dest_file_info.data_path);
684 error = NativeFileUtil::CopyOrMoveFile(
685 src_file_path,
686 dest_local_path,
687 FileSystemOperation::OPTION_NONE,
688 storage::NativeFileUtil::CopyOrMoveModeForDestination(dest_url,
689 true /* copy */));
690 } else {
691 error = CreateFile(context, src_file_path, dest_url, &dest_file_info);
692 }
693
694 if (error != base::File::FILE_OK)
695 return error;
696
697 if (overwrite) {
698 context->change_observers()->Notify(
699 &FileChangeObserver::OnModifyFile, MakeTuple(dest_url));
700 } else {
701 context->change_observers()->Notify(
702 &FileChangeObserver::OnCreateFile, MakeTuple(dest_url));
703 }
704
705 UpdateUsage(context, dest_url, growth);
706 TouchDirectory(db, dest_file_info.parent_id);
707 return base::File::FILE_OK;
708 }
709
710 base::File::Error ObfuscatedFileUtil::DeleteFile(
711 FileSystemOperationContext* context,
712 const FileSystemURL& url) {
713 SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, true);
714 if (!db)
715 return base::File::FILE_ERROR_FAILED;
716 FileId file_id;
717 if (!db->GetFileWithPath(url.path(), &file_id))
718 return base::File::FILE_ERROR_NOT_FOUND;
719
720 FileInfo file_info;
721 base::File::Info platform_file_info;
722 base::FilePath local_path;
723 base::File::Error error = GetFileInfoInternal(
724 db, context, url, file_id, &file_info, &platform_file_info, &local_path);
725 if (error != base::File::FILE_ERROR_NOT_FOUND &&
726 error != base::File::FILE_OK)
727 return error;
728
729 if (file_info.is_directory())
730 return base::File::FILE_ERROR_NOT_A_FILE;
731
732 int64 growth = -UsageForPath(file_info.name.size()) - platform_file_info.size;
733 AllocateQuota(context, growth);
734 if (!db->RemoveFileInfo(file_id)) {
735 NOTREACHED();
736 return base::File::FILE_ERROR_FAILED;
737 }
738 UpdateUsage(context, url, growth);
739 TouchDirectory(db, file_info.parent_id);
740
741 context->change_observers()->Notify(
742 &FileChangeObserver::OnRemoveFile, MakeTuple(url));
743
744 if (error == base::File::FILE_ERROR_NOT_FOUND)
745 return base::File::FILE_OK;
746
747 error = NativeFileUtil::DeleteFile(local_path);
748 if (base::File::FILE_OK != error)
749 LOG(WARNING) << "Leaked a backing file.";
750 return base::File::FILE_OK;
751 }
752
753 base::File::Error ObfuscatedFileUtil::DeleteDirectory(
754 FileSystemOperationContext* context,
755 const FileSystemURL& url) {
756 SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, true);
757 if (!db)
758 return base::File::FILE_ERROR_FAILED;
759
760 FileId file_id;
761 if (!db->GetFileWithPath(url.path(), &file_id))
762 return base::File::FILE_ERROR_NOT_FOUND;
763 FileInfo file_info;
764 if (!db->GetFileInfo(file_id, &file_info)) {
765 NOTREACHED();
766 return base::File::FILE_ERROR_FAILED;
767 }
768 if (!file_info.is_directory())
769 return base::File::FILE_ERROR_NOT_A_DIRECTORY;
770 if (!db->RemoveFileInfo(file_id))
771 return base::File::FILE_ERROR_NOT_EMPTY;
772 int64 growth = -UsageForPath(file_info.name.size());
773 AllocateQuota(context, growth);
774 UpdateUsage(context, url, growth);
775 TouchDirectory(db, file_info.parent_id);
776 context->change_observers()->Notify(
777 &FileChangeObserver::OnRemoveDirectory, MakeTuple(url));
778 return base::File::FILE_OK;
779 }
780
781 storage::ScopedFile ObfuscatedFileUtil::CreateSnapshotFile(
782 FileSystemOperationContext* context,
783 const FileSystemURL& url,
784 base::File::Error* error,
785 base::File::Info* file_info,
786 base::FilePath* platform_path) {
787 // We're just returning the local file information.
788 *error = GetFileInfo(context, url, file_info, platform_path);
789 if (*error == base::File::FILE_OK && file_info->is_directory) {
790 *file_info = base::File::Info();
791 *error = base::File::FILE_ERROR_NOT_A_FILE;
792 }
793 return storage::ScopedFile();
794 }
795
796 scoped_ptr<FileSystemFileUtil::AbstractFileEnumerator>
797 ObfuscatedFileUtil::CreateFileEnumerator(
798 FileSystemOperationContext* context,
799 const FileSystemURL& root_url,
800 bool recursive) {
801 SandboxDirectoryDatabase* db = GetDirectoryDatabase(root_url, false);
802 if (!db) {
803 return scoped_ptr<AbstractFileEnumerator>(new EmptyFileEnumerator());
804 }
805 return scoped_ptr<AbstractFileEnumerator>(
806 new ObfuscatedFileEnumerator(db, context, this, root_url, recursive));
807 }
808
809 bool ObfuscatedFileUtil::IsDirectoryEmpty(
810 FileSystemOperationContext* context,
811 const FileSystemURL& url) {
812 SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, false);
813 if (!db)
814 return true; // Not a great answer, but it's what others do.
815 FileId file_id;
816 if (!db->GetFileWithPath(url.path(), &file_id))
817 return true; // Ditto.
818 FileInfo file_info;
819 if (!db->GetFileInfo(file_id, &file_info)) {
820 DCHECK(!file_id);
821 // It's the root directory and the database hasn't been initialized yet.
822 return true;
823 }
824 if (!file_info.is_directory())
825 return true;
826 std::vector<FileId> children;
827 // TODO(ericu): This could easily be made faster with help from the database.
828 if (!db->ListChildren(file_id, &children))
829 return true;
830 return children.empty();
831 }
832
833 base::FilePath ObfuscatedFileUtil::GetDirectoryForOriginAndType(
834 const GURL& origin,
835 const std::string& type_string,
836 bool create,
837 base::File::Error* error_code) {
838 base::FilePath origin_dir = GetDirectoryForOrigin(origin, create, error_code);
839 if (origin_dir.empty())
840 return base::FilePath();
841 if (type_string.empty())
842 return origin_dir;
843 base::FilePath path = origin_dir.AppendASCII(type_string);
844 base::File::Error error = base::File::FILE_OK;
845 if (!base::DirectoryExists(path) &&
846 (!create || !base::CreateDirectory(path))) {
847 error = create ?
848 base::File::FILE_ERROR_FAILED :
849 base::File::FILE_ERROR_NOT_FOUND;
850 }
851
852 if (error_code)
853 *error_code = error;
854 return path;
855 }
856
857 bool ObfuscatedFileUtil::DeleteDirectoryForOriginAndType(
858 const GURL& origin,
859 const std::string& type_string) {
860 base::File::Error error = base::File::FILE_OK;
861 base::FilePath origin_type_path = GetDirectoryForOriginAndType(
862 origin, type_string, false, &error);
863 if (origin_type_path.empty())
864 return true;
865 if (error != base::File::FILE_ERROR_NOT_FOUND) {
866 // TODO(dmikurube): Consider the return value of DestroyDirectoryDatabase.
867 // We ignore its error now since 1) it doesn't matter the final result, and
868 // 2) it always returns false in Windows because of LevelDB's
869 // implementation.
870 // Information about failure would be useful for debugging.
871 if (!type_string.empty())
872 DestroyDirectoryDatabase(origin, type_string);
873 if (!base::DeleteFile(origin_type_path, true /* recursive */))
874 return false;
875 }
876
877 base::FilePath origin_path = VirtualPath::DirName(origin_type_path);
878 DCHECK_EQ(origin_path.value(),
879 GetDirectoryForOrigin(origin, false, NULL).value());
880
881 if (!type_string.empty()) {
882 // At this point we are sure we had successfully deleted the origin/type
883 // directory (i.e. we're ready to just return true).
884 // See if we have other directories in this origin directory.
885 for (std::set<std::string>::iterator iter = known_type_strings_.begin();
886 iter != known_type_strings_.end();
887 ++iter) {
888 if (*iter == type_string)
889 continue;
890 if (base::DirectoryExists(origin_path.AppendASCII(*iter))) {
891 // Other type's directory exists; just return true here.
892 return true;
893 }
894 }
895 }
896
897 // No other directories seem exist. Try deleting the entire origin directory.
898 InitOriginDatabase(origin, false);
899 if (origin_database_) {
900 origin_database_->RemovePathForOrigin(
901 storage::GetIdentifierFromOrigin(origin));
902 }
903 if (!base::DeleteFile(origin_path, true /* recursive */))
904 return false;
905
906 return true;
907 }
908
909 ObfuscatedFileUtil::AbstractOriginEnumerator*
910 ObfuscatedFileUtil::CreateOriginEnumerator() {
911 std::vector<SandboxOriginDatabase::OriginRecord> origins;
912
913 InitOriginDatabase(GURL(), false);
914 return new ObfuscatedOriginEnumerator(
915 origin_database_.get(), file_system_directory_);
916 }
917
918 bool ObfuscatedFileUtil::DestroyDirectoryDatabase(
919 const GURL& origin,
920 const std::string& type_string) {
921 std::string key = GetDirectoryDatabaseKey(origin, type_string);
922 if (key.empty())
923 return true;
924 DirectoryMap::iterator iter = directories_.find(key);
925 if (iter != directories_.end()) {
926 SandboxDirectoryDatabase* database = iter->second;
927 directories_.erase(iter);
928 delete database;
929 }
930
931 base::File::Error error = base::File::FILE_OK;
932 base::FilePath path = GetDirectoryForOriginAndType(
933 origin, type_string, false, &error);
934 if (path.empty() || error == base::File::FILE_ERROR_NOT_FOUND)
935 return true;
936 return SandboxDirectoryDatabase::DestroyDatabase(path, env_override_);
937 }
938
939 // static
940 int64 ObfuscatedFileUtil::ComputeFilePathCost(const base::FilePath& path) {
941 return UsageForPath(VirtualPath::BaseName(path).value().size());
942 }
943
944 void ObfuscatedFileUtil::MaybePrepopulateDatabase(
945 const std::vector<std::string>& type_strings_to_prepopulate) {
946 SandboxPrioritizedOriginDatabase database(file_system_directory_,
947 env_override_);
948 std::string origin_string = database.GetPrimaryOrigin();
949 if (origin_string.empty() || !database.HasOriginPath(origin_string))
950 return;
951 const GURL origin = storage::GetOriginFromIdentifier(origin_string);
952
953 // Prepopulate the directory database(s) if and only if this instance
954 // has primary origin and the directory database is already there.
955 for (size_t i = 0; i < type_strings_to_prepopulate.size(); ++i) {
956 const std::string type_string = type_strings_to_prepopulate[i];
957 // Only handles known types.
958 if (!ContainsKey(known_type_strings_, type_string))
959 continue;
960 base::File::Error error = base::File::FILE_ERROR_FAILED;
961 base::FilePath path = GetDirectoryForOriginAndType(
962 origin, type_string, false, &error);
963 if (error != base::File::FILE_OK)
964 continue;
965 scoped_ptr<SandboxDirectoryDatabase> db(
966 new SandboxDirectoryDatabase(path, env_override_));
967 if (db->Init(SandboxDirectoryDatabase::FAIL_ON_CORRUPTION)) {
968 directories_[GetDirectoryDatabaseKey(origin, type_string)] = db.release();
969 MarkUsed();
970 // Don't populate more than one database, as it may rather hurt
971 // performance.
972 break;
973 }
974 }
975 }
976
977 base::FilePath ObfuscatedFileUtil::GetDirectoryForURL(
978 const FileSystemURL& url,
979 bool create,
980 base::File::Error* error_code) {
981 return GetDirectoryForOriginAndType(
982 url.origin(), CallGetTypeStringForURL(url), create, error_code);
983 }
984
985 std::string ObfuscatedFileUtil::CallGetTypeStringForURL(
986 const FileSystemURL& url) {
987 DCHECK(!get_type_string_for_url_.is_null());
988 return get_type_string_for_url_.Run(url);
989 }
990
991 base::File::Error ObfuscatedFileUtil::GetFileInfoInternal(
992 SandboxDirectoryDatabase* db,
993 FileSystemOperationContext* context,
994 const FileSystemURL& url,
995 FileId file_id,
996 FileInfo* local_info,
997 base::File::Info* file_info,
998 base::FilePath* platform_file_path) {
999 DCHECK(db);
1000 DCHECK(context);
1001 DCHECK(file_info);
1002 DCHECK(platform_file_path);
1003
1004 if (!db->GetFileInfo(file_id, local_info)) {
1005 NOTREACHED();
1006 return base::File::FILE_ERROR_FAILED;
1007 }
1008
1009 if (local_info->is_directory()) {
1010 file_info->size = 0;
1011 file_info->is_directory = true;
1012 file_info->is_symbolic_link = false;
1013 file_info->last_modified = local_info->modification_time;
1014 *platform_file_path = base::FilePath();
1015 // We don't fill in ctime or atime.
1016 return base::File::FILE_OK;
1017 }
1018 if (local_info->data_path.empty())
1019 return base::File::FILE_ERROR_INVALID_OPERATION;
1020 base::FilePath local_path = DataPathToLocalPath(url, local_info->data_path);
1021 base::File::Error error = NativeFileUtil::GetFileInfo(
1022 local_path, file_info);
1023 // We should not follow symbolic links in sandboxed file system.
1024 if (base::IsLink(local_path)) {
1025 LOG(WARNING) << "Found a symbolic file.";
1026 error = base::File::FILE_ERROR_NOT_FOUND;
1027 }
1028 if (error == base::File::FILE_OK) {
1029 *platform_file_path = local_path;
1030 } else if (error == base::File::FILE_ERROR_NOT_FOUND) {
1031 LOG(WARNING) << "Lost a backing file.";
1032 InvalidateUsageCache(context, url.origin(), url.type());
1033 if (!db->RemoveFileInfo(file_id))
1034 return base::File::FILE_ERROR_FAILED;
1035 }
1036 return error;
1037 }
1038
1039 base::File ObfuscatedFileUtil::CreateAndOpenFile(
1040 FileSystemOperationContext* context,
1041 const FileSystemURL& dest_url,
1042 FileInfo* dest_file_info, int file_flags) {
1043 SandboxDirectoryDatabase* db = GetDirectoryDatabase(dest_url, true);
1044
1045 base::FilePath root, dest_local_path;
1046 base::File::Error error = GenerateNewLocalPath(db, context, dest_url, &root,
1047 &dest_local_path);
1048 if (error != base::File::FILE_OK)
1049 return base::File(error);
1050
1051 if (base::PathExists(dest_local_path)) {
1052 if (!base::DeleteFile(dest_local_path, true /* recursive */))
1053 return base::File(base::File::FILE_ERROR_FAILED);
1054 LOG(WARNING) << "A stray file detected";
1055 InvalidateUsageCache(context, dest_url.origin(), dest_url.type());
1056 }
1057
1058 base::File file = NativeFileUtil::CreateOrOpen(dest_local_path, file_flags);
1059 if (!file.IsValid())
1060 return file.Pass();
1061
1062 if (!file.created()) {
1063 file.Close();
1064 base::DeleteFile(dest_local_path, false /* recursive */);
1065 return base::File(base::File::FILE_ERROR_FAILED);
1066 }
1067
1068 error = CommitCreateFile(root, dest_local_path, db, dest_file_info);
1069 if (error != base::File::FILE_OK) {
1070 file.Close();
1071 base::DeleteFile(dest_local_path, false /* recursive */);
1072 return base::File(error);
1073 }
1074
1075 return file.Pass();
1076 }
1077
1078 base::File::Error ObfuscatedFileUtil::CreateFile(
1079 FileSystemOperationContext* context,
1080 const base::FilePath& src_file_path,
1081 const FileSystemURL& dest_url,
1082 FileInfo* dest_file_info) {
1083 SandboxDirectoryDatabase* db = GetDirectoryDatabase(dest_url, true);
1084
1085 base::FilePath root, dest_local_path;
1086 base::File::Error error = GenerateNewLocalPath(db, context, dest_url, &root,
1087 &dest_local_path);
1088 if (error != base::File::FILE_OK)
1089 return error;
1090
1091 bool created = false;
1092 if (src_file_path.empty()) {
1093 if (base::PathExists(dest_local_path)) {
1094 if (!base::DeleteFile(dest_local_path, true /* recursive */))
1095 return base::File::FILE_ERROR_FAILED;
1096 LOG(WARNING) << "A stray file detected";
1097 InvalidateUsageCache(context, dest_url.origin(), dest_url.type());
1098 }
1099
1100 error = NativeFileUtil::EnsureFileExists(dest_local_path, &created);
1101 } else {
1102 error = NativeFileUtil::CopyOrMoveFile(
1103 src_file_path,
1104 dest_local_path,
1105 FileSystemOperation::OPTION_NONE,
1106 storage::NativeFileUtil::CopyOrMoveModeForDestination(dest_url,
1107 true /* copy */));
1108 created = true;
1109 }
1110 if (error != base::File::FILE_OK)
1111 return error;
1112 if (!created)
1113 return base::File::FILE_ERROR_FAILED;
1114
1115 return CommitCreateFile(root, dest_local_path, db, dest_file_info);
1116 }
1117
1118 base::File::Error ObfuscatedFileUtil::CommitCreateFile(
1119 const base::FilePath& root,
1120 const base::FilePath& local_path,
1121 SandboxDirectoryDatabase* db,
1122 FileInfo* dest_file_info) {
1123 // This removes the root, including the trailing slash, leaving a relative
1124 // path.
1125 dest_file_info->data_path = base::FilePath(
1126 local_path.value().substr(root.value().length() + 1));
1127
1128 FileId file_id;
1129 base::File::Error error = db->AddFileInfo(*dest_file_info, &file_id);
1130 if (error != base::File::FILE_OK)
1131 return error;
1132
1133 TouchDirectory(db, dest_file_info->parent_id);
1134 return base::File::FILE_OK;
1135 }
1136
1137 base::FilePath ObfuscatedFileUtil::DataPathToLocalPath(
1138 const FileSystemURL& url, const base::FilePath& data_path) {
1139 base::File::Error error = base::File::FILE_OK;
1140 base::FilePath root = GetDirectoryForURL(url, false, &error);
1141 if (error != base::File::FILE_OK)
1142 return base::FilePath();
1143 return root.Append(data_path);
1144 }
1145
1146 std::string ObfuscatedFileUtil::GetDirectoryDatabaseKey(
1147 const GURL& origin, const std::string& type_string) {
1148 if (type_string.empty()) {
1149 LOG(WARNING) << "Unknown filesystem type requested:" << type_string;
1150 return std::string();
1151 }
1152 // For isolated origin we just use a type string as a key.
1153 return storage::GetIdentifierFromOrigin(origin) + type_string;
1154 }
1155
1156 // TODO(ericu): How to do the whole validation-without-creation thing?
1157 // We may not have quota even to create the database.
1158 // Ah, in that case don't even get here?
1159 // Still doesn't answer the quota issue, though.
1160 SandboxDirectoryDatabase* ObfuscatedFileUtil::GetDirectoryDatabase(
1161 const FileSystemURL& url, bool create) {
1162 std::string key = GetDirectoryDatabaseKey(
1163 url.origin(), CallGetTypeStringForURL(url));
1164 if (key.empty())
1165 return NULL;
1166
1167 DirectoryMap::iterator iter = directories_.find(key);
1168 if (iter != directories_.end()) {
1169 MarkUsed();
1170 return iter->second;
1171 }
1172
1173 base::File::Error error = base::File::FILE_OK;
1174 base::FilePath path = GetDirectoryForURL(url, create, &error);
1175 if (error != base::File::FILE_OK) {
1176 LOG(WARNING) << "Failed to get origin+type directory: "
1177 << url.DebugString() << " error:" << error;
1178 return NULL;
1179 }
1180 MarkUsed();
1181 SandboxDirectoryDatabase* database =
1182 new SandboxDirectoryDatabase(path, env_override_);
1183 directories_[key] = database;
1184 return database;
1185 }
1186
1187 base::FilePath ObfuscatedFileUtil::GetDirectoryForOrigin(
1188 const GURL& origin, bool create, base::File::Error* error_code) {
1189 if (!InitOriginDatabase(origin, create)) {
1190 if (error_code) {
1191 *error_code = create ?
1192 base::File::FILE_ERROR_FAILED :
1193 base::File::FILE_ERROR_NOT_FOUND;
1194 }
1195 return base::FilePath();
1196 }
1197 base::FilePath directory_name;
1198 std::string id = storage::GetIdentifierFromOrigin(origin);
1199
1200 bool exists_in_db = origin_database_->HasOriginPath(id);
1201 if (!exists_in_db && !create) {
1202 if (error_code)
1203 *error_code = base::File::FILE_ERROR_NOT_FOUND;
1204 return base::FilePath();
1205 }
1206 if (!origin_database_->GetPathForOrigin(id, &directory_name)) {
1207 if (error_code)
1208 *error_code = base::File::FILE_ERROR_FAILED;
1209 return base::FilePath();
1210 }
1211
1212 base::FilePath path = file_system_directory_.Append(directory_name);
1213 bool exists_in_fs = base::DirectoryExists(path);
1214 if (!exists_in_db && exists_in_fs) {
1215 if (!base::DeleteFile(path, true)) {
1216 if (error_code)
1217 *error_code = base::File::FILE_ERROR_FAILED;
1218 return base::FilePath();
1219 }
1220 exists_in_fs = false;
1221 }
1222
1223 if (!exists_in_fs) {
1224 if (!create || !base::CreateDirectory(path)) {
1225 if (error_code)
1226 *error_code = create ?
1227 base::File::FILE_ERROR_FAILED :
1228 base::File::FILE_ERROR_NOT_FOUND;
1229 return base::FilePath();
1230 }
1231 }
1232
1233 if (error_code)
1234 *error_code = base::File::FILE_OK;
1235
1236 return path;
1237 }
1238
1239 void ObfuscatedFileUtil::InvalidateUsageCache(
1240 FileSystemOperationContext* context,
1241 const GURL& origin,
1242 FileSystemType type) {
1243 if (sandbox_delegate_)
1244 sandbox_delegate_->InvalidateUsageCache(origin, type);
1245 }
1246
1247 void ObfuscatedFileUtil::MarkUsed() {
1248 if (!timer_)
1249 timer_.reset(new TimedTaskHelper(file_task_runner_.get()));
1250
1251 if (timer_->IsRunning()) {
1252 timer_->Reset();
1253 } else {
1254 timer_->Start(FROM_HERE,
1255 base::TimeDelta::FromSeconds(db_flush_delay_seconds_),
1256 base::Bind(&ObfuscatedFileUtil::DropDatabases,
1257 base::Unretained(this)));
1258 }
1259 }
1260
1261 void ObfuscatedFileUtil::DropDatabases() {
1262 origin_database_.reset();
1263 STLDeleteContainerPairSecondPointers(
1264 directories_.begin(), directories_.end());
1265 directories_.clear();
1266 timer_.reset();
1267 }
1268
1269 bool ObfuscatedFileUtil::InitOriginDatabase(const GURL& origin_hint,
1270 bool create) {
1271 if (origin_database_)
1272 return true;
1273
1274 if (!create && !base::DirectoryExists(file_system_directory_))
1275 return false;
1276 if (!base::CreateDirectory(file_system_directory_)) {
1277 LOG(WARNING) << "Failed to create FileSystem directory: " <<
1278 file_system_directory_.value();
1279 return false;
1280 }
1281
1282 SandboxPrioritizedOriginDatabase* prioritized_origin_database =
1283 new SandboxPrioritizedOriginDatabase(file_system_directory_,
1284 env_override_);
1285 origin_database_.reset(prioritized_origin_database);
1286
1287 if (origin_hint.is_empty() || !HasIsolatedStorage(origin_hint))
1288 return true;
1289
1290 const std::string isolated_origin_string =
1291 storage::GetIdentifierFromOrigin(origin_hint);
1292
1293 // TODO(kinuko): Deprecate this after a few release cycles, e.g. around M33.
1294 base::FilePath isolated_origin_dir = file_system_directory_.Append(
1295 SandboxIsolatedOriginDatabase::kObsoleteOriginDirectory);
1296 if (base::DirectoryExists(isolated_origin_dir) &&
1297 prioritized_origin_database->GetSandboxOriginDatabase()) {
1298 SandboxIsolatedOriginDatabase::MigrateBackFromObsoleteOriginDatabase(
1299 isolated_origin_string,
1300 file_system_directory_,
1301 prioritized_origin_database->GetSandboxOriginDatabase());
1302 }
1303
1304 prioritized_origin_database->InitializePrimaryOrigin(
1305 isolated_origin_string);
1306
1307 return true;
1308 }
1309
1310 base::File::Error ObfuscatedFileUtil::GenerateNewLocalPath(
1311 SandboxDirectoryDatabase* db,
1312 FileSystemOperationContext* context,
1313 const FileSystemURL& url,
1314 base::FilePath* root,
1315 base::FilePath* local_path) {
1316 DCHECK(local_path);
1317 int64 number;
1318 if (!db || !db->GetNextInteger(&number))
1319 return base::File::FILE_ERROR_FAILED;
1320
1321 base::File::Error error = base::File::FILE_OK;
1322 *root = GetDirectoryForURL(url, false, &error);
1323 if (error != base::File::FILE_OK)
1324 return error;
1325
1326 // We use the third- and fourth-to-last digits as the directory.
1327 int64 directory_number = number % 10000 / 100;
1328 base::FilePath new_local_path = root->AppendASCII(
1329 base::StringPrintf("%02" PRId64, directory_number));
1330
1331 error = NativeFileUtil::CreateDirectory(
1332 new_local_path, false /* exclusive */, false /* recursive */);
1333 if (error != base::File::FILE_OK)
1334 return error;
1335
1336 *local_path =
1337 new_local_path.AppendASCII(base::StringPrintf("%08" PRId64, number));
1338 return base::File::FILE_OK;
1339 }
1340
1341 base::File ObfuscatedFileUtil::CreateOrOpenInternal(
1342 FileSystemOperationContext* context,
1343 const FileSystemURL& url, int file_flags) {
1344 DCHECK(!(file_flags & (base::File::FLAG_DELETE_ON_CLOSE |
1345 base::File::FLAG_HIDDEN | base::File::FLAG_EXCLUSIVE_READ |
1346 base::File::FLAG_EXCLUSIVE_WRITE)));
1347 SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, true);
1348 if (!db)
1349 return base::File(base::File::FILE_ERROR_FAILED);
1350 FileId file_id;
1351 if (!db->GetFileWithPath(url.path(), &file_id)) {
1352 // The file doesn't exist.
1353 if (!(file_flags & (base::File::FLAG_CREATE |
1354 base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_OPEN_ALWAYS))) {
1355 return base::File(base::File::FILE_ERROR_NOT_FOUND);
1356 }
1357 FileId parent_id;
1358 if (!db->GetFileWithPath(VirtualPath::DirName(url.path()), &parent_id))
1359 return base::File(base::File::FILE_ERROR_NOT_FOUND);
1360 FileInfo file_info;
1361 InitFileInfo(&file_info, parent_id,
1362 VirtualPath::BaseName(url.path()).value());
1363
1364 int64 growth = UsageForPath(file_info.name.size());
1365 if (!AllocateQuota(context, growth))
1366 return base::File(base::File::FILE_ERROR_NO_SPACE);
1367 base::File file = CreateAndOpenFile(context, url, &file_info, file_flags);
1368 if (file.IsValid()) {
1369 UpdateUsage(context, url, growth);
1370 context->change_observers()->Notify(
1371 &FileChangeObserver::OnCreateFile, MakeTuple(url));
1372 }
1373 return file.Pass();
1374 }
1375
1376 if (file_flags & base::File::FLAG_CREATE)
1377 return base::File(base::File::FILE_ERROR_EXISTS);
1378
1379 base::File::Info platform_file_info;
1380 base::FilePath local_path;
1381 FileInfo file_info;
1382 base::File::Error error = GetFileInfoInternal(
1383 db, context, url, file_id, &file_info, &platform_file_info, &local_path);
1384 if (error != base::File::FILE_OK)
1385 return base::File(error);
1386 if (file_info.is_directory())
1387 return base::File(base::File::FILE_ERROR_NOT_A_FILE);
1388
1389 int64 delta = 0;
1390 if (file_flags & (base::File::FLAG_CREATE_ALWAYS |
1391 base::File::FLAG_OPEN_TRUNCATED)) {
1392 // The file exists and we're truncating.
1393 delta = -platform_file_info.size;
1394 AllocateQuota(context, delta);
1395 }
1396
1397 base::File file = NativeFileUtil::CreateOrOpen(local_path, file_flags);
1398 if (!file.IsValid()) {
1399 error = file.error_details();
1400 if (error == base::File::FILE_ERROR_NOT_FOUND) {
1401 // TODO(tzik): Also invalidate on-memory usage cache in UsageTracker.
1402 // TODO(tzik): Delete database entry after ensuring the file lost.
1403 InvalidateUsageCache(context, url.origin(), url.type());
1404 LOG(WARNING) << "Lost a backing file.";
1405 return base::File(base::File::FILE_ERROR_FAILED);
1406 }
1407 return file.Pass();
1408 }
1409
1410 // If truncating we need to update the usage.
1411 if (delta) {
1412 UpdateUsage(context, url, delta);
1413 context->change_observers()->Notify(
1414 &FileChangeObserver::OnModifyFile, MakeTuple(url));
1415 }
1416 return file.Pass();
1417 }
1418
1419 bool ObfuscatedFileUtil::HasIsolatedStorage(const GURL& origin) {
1420 return special_storage_policy_.get() &&
1421 special_storage_policy_->HasIsolatedStorage(origin);
1422 }
1423
1424 } // namespace storage
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