blob: 300432eaa99fed84fd1284c06058bfd780fecf9f [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "storage/browser/fileapi/obfuscated_file_util.h"
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <tuple>
#include "base/bind.h"
#include "base/containers/queue.h"
#include "base/files/file_util.h"
#include "base/format_macros.h"
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/sys_string_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/time/time.h"
#include "storage/browser/fileapi/file_observers.h"
#include "storage/browser/fileapi/file_system_context.h"
#include "storage/browser/fileapi/file_system_operation_context.h"
#include "storage/browser/fileapi/sandbox_file_system_backend.h"
#include "storage/browser/fileapi/sandbox_isolated_origin_database.h"
#include "storage/browser/fileapi/sandbox_origin_database.h"
#include "storage/browser/fileapi/sandbox_prioritized_origin_database.h"
#include "storage/browser/quota/quota_manager.h"
#include "storage/common/database/database_identifier.h"
#include "storage/common/fileapi/file_system_util.h"
#include "third_party/leveldatabase/leveldb_chrome.h"
#include "url/gurl.h"
// Example of various paths:
// void ObfuscatedFileUtil::DoSomething(const FileSystemURL& url) {
// base::FilePath virtual_path = url.path();
// base::FilePath local_path = GetLocalFilePath(url);
//
// NativeFileUtil::DoSomething(local_path);
// file_util::DoAnother(local_path);
// }
namespace storage {
namespace {
using FileId = SandboxDirectoryDatabase::FileId;
using FileInfo = SandboxDirectoryDatabase::FileInfo;
void InitFileInfo(
SandboxDirectoryDatabase::FileInfo* file_info,
SandboxDirectoryDatabase::FileId parent_id,
const base::FilePath::StringType& file_name) {
DCHECK(file_info);
file_info->parent_id = parent_id;
file_info->name = file_name;
}
// Costs computed as per crbug.com/86114, based on the LevelDB implementation of
// path storage under Linux. It's not clear if that will differ on Windows, on
// which base::FilePath uses wide chars [since they're converted to UTF-8 for
// storage anyway], but as long as the cost is high enough that one can't cheat
// on quota by storing data in paths, it doesn't need to be all that accurate.
const int64_t kPathCreationQuotaCost = 146; // Bytes per inode, basically.
const int64_t kPathByteQuotaCost =
2; // Bytes per byte of path length in UTF-8.
const char kDirectoryDatabaseKeySeparator = ' ';
int64_t UsageForPath(size_t length) {
return kPathCreationQuotaCost +
static_cast<int64_t>(length) * kPathByteQuotaCost;
}
bool AllocateQuota(FileSystemOperationContext* context, int64_t growth) {
if (context->allowed_bytes_growth() == storage::QuotaManager::kNoLimit)
return true;
int64_t new_quota = context->allowed_bytes_growth() - growth;
if (growth > 0 && new_quota < 0)
return false;
context->set_allowed_bytes_growth(new_quota);
return true;
}
void UpdateUsage(FileSystemOperationContext* context,
const FileSystemURL& url,
int64_t growth) {
context->update_observers()->Notify(&FileUpdateObserver::OnUpdate, url,
growth);
}
void TouchDirectory(SandboxDirectoryDatabase* db, FileId dir_id) {
DCHECK(db);
if (!db->UpdateModificationTime(dir_id, base::Time::Now()))
NOTREACHED();
}
enum IsolatedOriginStatus {
kIsolatedOriginMatch,
kIsolatedOriginDontMatch,
kIsolatedOriginStatusMax,
};
} // namespace
class ObfuscatedFileEnumerator final
: public FileSystemFileUtil::AbstractFileEnumerator {
public:
ObfuscatedFileEnumerator(
SandboxDirectoryDatabase* db,
FileSystemOperationContext* context,
ObfuscatedFileUtil* obfuscated_file_util,
const FileSystemURL& root_url,
bool recursive)
: db_(db),
context_(context),
obfuscated_file_util_(obfuscated_file_util),
root_url_(root_url),
recursive_(recursive),
current_file_id_(0) {
base::FilePath root_virtual_path = root_url.path();
FileId file_id;
if (!db_->GetFileWithPath(root_virtual_path, &file_id))
return;
FileRecord record = { file_id, root_virtual_path };
recurse_queue_.push(record);
}
~ObfuscatedFileEnumerator() override = default;
base::FilePath Next() override {
FileInfo file_info;
base::File::Error error;
do {
ProcessRecurseQueue();
if (display_stack_.empty())
return base::FilePath();
current_file_id_ = display_stack_.back();
display_stack_.pop_back();
base::FilePath platform_file_path;
error = obfuscated_file_util_->GetFileInfoInternal(
db_, context_, root_url_, current_file_id_,
&file_info, &current_platform_file_info_, &platform_file_path);
} while (error != base::File::FILE_OK);
base::FilePath virtual_path =
current_parent_virtual_path_.Append(file_info.name);
if (recursive_ && file_info.is_directory()) {
FileRecord record = { current_file_id_, virtual_path };
recurse_queue_.push(record);
}
return virtual_path;
}
int64_t Size() override { return current_platform_file_info_.size; }
base::Time LastModifiedTime() override {
return current_platform_file_info_.last_modified;
}
bool IsDirectory() override {
return current_platform_file_info_.is_directory;
}
private:
using FileId = SandboxDirectoryDatabase::FileId;
using FileInfo = SandboxDirectoryDatabase::FileInfo;
struct FileRecord {
FileId file_id;
base::FilePath virtual_path;
};
void ProcessRecurseQueue() {
while (display_stack_.empty() && !recurse_queue_.empty()) {
FileRecord entry = recurse_queue_.front();
recurse_queue_.pop();
if (!db_->ListChildren(entry.file_id, &display_stack_)) {
display_stack_.clear();
return;
}
current_parent_virtual_path_ = entry.virtual_path;
}
}
SandboxDirectoryDatabase* db_;
FileSystemOperationContext* context_;
ObfuscatedFileUtil* obfuscated_file_util_;
FileSystemURL root_url_;
bool recursive_;
base::queue<FileRecord> recurse_queue_;
std::vector<FileId> display_stack_;
base::FilePath current_parent_virtual_path_;
FileId current_file_id_;
base::File::Info current_platform_file_info_;
};
class ObfuscatedOriginEnumerator
: public ObfuscatedFileUtil::AbstractOriginEnumerator {
public:
using OriginRecord = SandboxOriginDatabase::OriginRecord;
ObfuscatedOriginEnumerator(SandboxOriginDatabaseInterface* origin_database,
const base::FilePath& base_file_path)
: base_file_path_(base_file_path) {
if (origin_database)
origin_database->ListAllOrigins(&origins_);
}
~ObfuscatedOriginEnumerator() override = default;
// Returns the next origin. Returns empty if there are no more origins.
GURL Next() override {
OriginRecord record;
if (!origins_.empty()) {
record = origins_.back();
origins_.pop_back();
}
current_ = record;
return storage::GetOriginURLFromIdentifier(record.origin);
}
// Returns the current origin's information.
bool HasTypeDirectory(const std::string& type_string) const override {
if (current_.path.empty())
return false;
if (type_string.empty()) {
NOTREACHED();
return false;
}
base::FilePath path =
base_file_path_.Append(current_.path).AppendASCII(type_string);
// TODO(https://crbug.com/93417): Ensure that there are no paths on disk in
// incognito.
return base::DirectoryExists(path);
}
private:
std::vector<OriginRecord> origins_;
OriginRecord current_;
base::FilePath base_file_path_;
};
ObfuscatedFileUtil::ObfuscatedFileUtil(
storage::SpecialStoragePolicy* special_storage_policy,
const base::FilePath& file_system_directory,
leveldb::Env* env_override,
GetTypeStringForURLCallback get_type_string_for_url,
const std::set<std::string>& known_type_strings,
SandboxFileSystemBackendDelegate* sandbox_delegate,
bool is_incognito)
: special_storage_policy_(special_storage_policy),
file_system_directory_(file_system_directory),
env_override_(env_override),
db_flush_delay_seconds_(10 * 60), // 10 mins.
get_type_string_for_url_(std::move(get_type_string_for_url)),
known_type_strings_(known_type_strings),
sandbox_delegate_(sandbox_delegate),
delegate_(std::make_unique<ObfuscatedFileUtilDiskDelegate>()) {
// TODO(https://crbug.com/93417): |delegate_| to be initialized with an
// instance of |ObfuscatedFileUtilMemoryDelegate| if |is_incognito| is true.
DCHECK(!get_type_string_for_url_.is_null());
DETACH_FROM_SEQUENCE(sequence_checker_);
DCHECK(!is_incognito ||
(env_override && leveldb_chrome::IsMemEnv(env_override)));
}
ObfuscatedFileUtil::~ObfuscatedFileUtil() {
// Destruction can happen on any sequence.
DETACH_FROM_SEQUENCE(sequence_checker_);
DropDatabases();
}
base::File ObfuscatedFileUtil::CreateOrOpen(
FileSystemOperationContext* context,
const FileSystemURL& url, int file_flags) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
base::File file = CreateOrOpenInternal(context, url, file_flags);
if (file.IsValid() && file_flags & base::File::FLAG_WRITE &&
context->quota_limit_type() == storage::kQuotaLimitTypeUnlimited &&
sandbox_delegate_) {
sandbox_delegate_->StickyInvalidateUsageCache(url.origin().GetURL(),
url.type());
}
return file;
}
base::File::Error ObfuscatedFileUtil::EnsureFileExists(
FileSystemOperationContext* context,
const FileSystemURL& url,
bool* created) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, true);
if (!db)
return base::File::FILE_ERROR_FAILED;
FileId file_id;
if (db->GetFileWithPath(url.path(), &file_id)) {
FileInfo file_info;
if (!db->GetFileInfo(file_id, &file_info)) {
NOTREACHED();
return base::File::FILE_ERROR_FAILED;
}
if (file_info.is_directory())
return base::File::FILE_ERROR_NOT_A_FILE;
if (created)
*created = false;
return base::File::FILE_OK;
}
FileId parent_id;
if (!db->GetFileWithPath(VirtualPath::DirName(url.path()), &parent_id))
return base::File::FILE_ERROR_NOT_FOUND;
FileInfo file_info;
InitFileInfo(&file_info, parent_id,
VirtualPath::BaseName(url.path()).value());
int64_t growth = UsageForPath(file_info.name.size());
if (!AllocateQuota(context, growth))
return base::File::FILE_ERROR_NO_SPACE;
base::File::Error error = CreateFile(context, base::FilePath(), url,
&file_info);
if (created && base::File::FILE_OK == error) {
*created = true;
UpdateUsage(context, url, growth);
context->change_observers()->Notify(&FileChangeObserver::OnCreateFile, url);
}
return error;
}
base::File::Error ObfuscatedFileUtil::CreateDirectory(
FileSystemOperationContext* context,
const FileSystemURL& url,
bool exclusive,
bool recursive) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, true);
if (!db)
return base::File::FILE_ERROR_FAILED;
FileId file_id;
if (db->GetFileWithPath(url.path(), &file_id)) {
FileInfo file_info;
if (exclusive)
return base::File::FILE_ERROR_EXISTS;
if (!db->GetFileInfo(file_id, &file_info)) {
NOTREACHED();
return base::File::FILE_ERROR_FAILED;
}
if (!file_info.is_directory())
return base::File::FILE_ERROR_NOT_A_DIRECTORY;
return base::File::FILE_OK;
}
std::vector<base::FilePath::StringType> components =
VirtualPath::GetComponents(url.path());
FileId parent_id = 0;
size_t index;
for (index = 0; index < components.size(); ++index) {
base::FilePath::StringType name = components[index];
if (name == FILE_PATH_LITERAL("/"))
continue;
if (!db->GetChildWithName(parent_id, name, &parent_id))
break;
}
if (!db->IsDirectory(parent_id))
return base::File::FILE_ERROR_NOT_A_DIRECTORY;
if (!recursive && components.size() - index > 1)
return base::File::FILE_ERROR_NOT_FOUND;
bool first = true;
for (; index < components.size(); ++index) {
FileInfo file_info;
file_info.name = components[index];
if (file_info.name == FILE_PATH_LITERAL("/"))
continue;
file_info.modification_time = base::Time::Now();
file_info.parent_id = parent_id;
int64_t growth = UsageForPath(file_info.name.size());
if (!AllocateQuota(context, growth))
return base::File::FILE_ERROR_NO_SPACE;
base::File::Error error = db->AddFileInfo(file_info, &parent_id);
if (error != base::File::FILE_OK)
return error;
UpdateUsage(context, url, growth);
context->change_observers()->Notify(&FileChangeObserver::OnCreateDirectory,
url);
if (first) {
first = false;
TouchDirectory(db, file_info.parent_id);
}
}
return base::File::FILE_OK;
}
base::File::Error ObfuscatedFileUtil::GetFileInfo(
FileSystemOperationContext* context,
const FileSystemURL& url,
base::File::Info* file_info,
base::FilePath* platform_file_path) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, false);
if (!db)
return base::File::FILE_ERROR_NOT_FOUND;
FileId file_id;
if (!db->GetFileWithPath(url.path(), &file_id))
return base::File::FILE_ERROR_NOT_FOUND;
FileInfo local_info;
return GetFileInfoInternal(db, context, url, file_id, &local_info, file_info,
platform_file_path);
}
base::File::Error ObfuscatedFileUtil::GetLocalFilePath(
FileSystemOperationContext* context,
const FileSystemURL& url,
base::FilePath* local_path) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, false);
if (!db)
return base::File::FILE_ERROR_NOT_FOUND;
FileId file_id;
if (!db->GetFileWithPath(url.path(), &file_id))
return base::File::FILE_ERROR_NOT_FOUND;
FileInfo file_info;
if (!db->GetFileInfo(file_id, &file_info) || file_info.is_directory()) {
NOTREACHED();
// Directories have no local file path.
return base::File::FILE_ERROR_NOT_FOUND;
}
*local_path = DataPathToLocalPath(url, file_info.data_path);
if (local_path->empty())
return base::File::FILE_ERROR_NOT_FOUND;
return base::File::FILE_OK;
}
base::File::Error ObfuscatedFileUtil::Touch(
FileSystemOperationContext* context,
const FileSystemURL& url,
const base::Time& last_access_time,
const base::Time& last_modified_time) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, false);
if (!db)
return base::File::FILE_ERROR_NOT_FOUND;
FileId file_id;
if (!db->GetFileWithPath(url.path(), &file_id))
return base::File::FILE_ERROR_NOT_FOUND;
FileInfo file_info;
if (!db->GetFileInfo(file_id, &file_info)) {
NOTREACHED();
return base::File::FILE_ERROR_FAILED;
}
if (file_info.is_directory()) {
if (!db->UpdateModificationTime(file_id, last_modified_time))
return base::File::FILE_ERROR_FAILED;
return base::File::FILE_OK;
}
return delegate_->Touch(DataPathToLocalPath(url, file_info.data_path),
last_access_time, last_modified_time);
}
base::File::Error ObfuscatedFileUtil::Truncate(
FileSystemOperationContext* context,
const FileSystemURL& url,
int64_t length) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
base::File::Info file_info;
base::FilePath local_path;
base::File::Error error =
GetFileInfo(context, url, &file_info, &local_path);
if (error != base::File::FILE_OK)
return error;
int64_t growth = length - file_info.size;
if (!AllocateQuota(context, growth))
return base::File::FILE_ERROR_NO_SPACE;
error = delegate_->Truncate(local_path, length);
if (error == base::File::FILE_OK) {
UpdateUsage(context, url, growth);
context->change_observers()->Notify(&FileChangeObserver::OnModifyFile, url);
}
return error;
}
base::File::Error ObfuscatedFileUtil::CopyOrMoveFile(
FileSystemOperationContext* context,
const FileSystemURL& src_url,
const FileSystemURL& dest_url,
CopyOrMoveOption option,
bool copy) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Cross-filesystem copies and moves should be handled via CopyInForeignFile.
DCHECK(src_url.origin() == dest_url.origin());
DCHECK(src_url.type() == dest_url.type());
SandboxDirectoryDatabase* db = GetDirectoryDatabase(src_url, true);
if (!db)
return base::File::FILE_ERROR_FAILED;
FileId src_file_id;
if (!db->GetFileWithPath(src_url.path(), &src_file_id))
return base::File::FILE_ERROR_NOT_FOUND;
FileId dest_file_id;
bool overwrite = db->GetFileWithPath(dest_url.path(),
&dest_file_id);
FileInfo src_file_info;
base::File::Info src_platform_file_info;
base::FilePath src_local_path;
base::File::Error error = GetFileInfoInternal(
db, context, src_url, src_file_id,
&src_file_info, &src_platform_file_info, &src_local_path);
if (error != base::File::FILE_OK)
return error;
if (src_file_info.is_directory())
return base::File::FILE_ERROR_NOT_A_FILE;
FileInfo dest_file_info;
base::File::Info dest_platform_file_info; // overwrite case only
base::FilePath dest_local_path; // overwrite case only
if (overwrite) {
base::File::Error error = GetFileInfoInternal(
db, context, dest_url, dest_file_id,
&dest_file_info, &dest_platform_file_info, &dest_local_path);
if (error == base::File::FILE_ERROR_NOT_FOUND)
overwrite = false; // fallback to non-overwrite case
else if (error != base::File::FILE_OK)
return error;
else if (dest_file_info.is_directory())
return base::File::FILE_ERROR_INVALID_OPERATION;
}
if (!overwrite) {
FileId dest_parent_id;
if (!db->GetFileWithPath(VirtualPath::DirName(dest_url.path()),
&dest_parent_id)) {
return base::File::FILE_ERROR_NOT_FOUND;
}
dest_file_info = src_file_info;
dest_file_info.parent_id = dest_parent_id;
dest_file_info.name =
VirtualPath::BaseName(dest_url.path()).value();
}
int64_t growth = 0;
if (copy)
growth += src_platform_file_info.size;
else
growth -= UsageForPath(src_file_info.name.size());
if (overwrite)
growth -= dest_platform_file_info.size;
else
growth += UsageForPath(dest_file_info.name.size());
if (!AllocateQuota(context, growth))
return base::File::FILE_ERROR_NO_SPACE;
/*
* Copy-with-overwrite
* Just overwrite data file
* Copy-without-overwrite
* Copy backing file
* Create new metadata pointing to new backing file.
* Move-with-overwrite
* transaction:
* Remove source entry.
* Point target entry to source entry's backing file.
* Delete target entry's old backing file
* Move-without-overwrite
* Just update metadata
*/
error = base::File::FILE_ERROR_FAILED;
if (copy) {
if (overwrite) {
error = delegate_->CopyOrMoveFile(
src_local_path, dest_local_path, option,
delegate_->CopyOrMoveModeForDestination(dest_url, true /* copy */));
} else { // non-overwrite
error = CreateFile(context, src_local_path, dest_url, &dest_file_info);
}
} else {
if (overwrite) {
if (db->OverwritingMoveFile(src_file_id, dest_file_id)) {
if (base::File::FILE_OK != delegate_->DeleteFile(dest_local_path))
LOG(WARNING) << "Leaked a backing file.";
error = base::File::FILE_OK;
} else {
error = base::File::FILE_ERROR_FAILED;
}
} else { // non-overwrite
if (db->UpdateFileInfo(src_file_id, dest_file_info))
error = base::File::FILE_OK;
else
error = base::File::FILE_ERROR_FAILED;
}
}
if (error != base::File::FILE_OK)
return error;
if (overwrite) {
context->change_observers()->Notify(&FileChangeObserver::OnModifyFile,
dest_url);
} else {
context->change_observers()->Notify(&FileChangeObserver::OnCreateFileFrom,
dest_url, src_url);
}
if (!copy) {
context->change_observers()->Notify(&FileChangeObserver::OnRemoveFile,
src_url);
TouchDirectory(db, src_file_info.parent_id);
}
TouchDirectory(db, dest_file_info.parent_id);
UpdateUsage(context, dest_url, growth);
return error;
}
base::File::Error ObfuscatedFileUtil::CopyInForeignFile(
FileSystemOperationContext* context,
const base::FilePath& src_file_path,
const FileSystemURL& dest_url) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
SandboxDirectoryDatabase* db = GetDirectoryDatabase(dest_url, true);
if (!db)
return base::File::FILE_ERROR_FAILED;
base::File::Info src_platform_file_info;
if (delegate_->GetFileInfo(src_file_path, &src_platform_file_info) !=
base::File::FILE_OK)
return base::File::FILE_ERROR_NOT_FOUND;
FileId dest_file_id;
bool overwrite = db->GetFileWithPath(dest_url.path(),
&dest_file_id);
FileInfo dest_file_info;
base::File::Info dest_platform_file_info; // overwrite case only
if (overwrite) {
base::FilePath dest_local_path;
base::File::Error error = GetFileInfoInternal(
db, context, dest_url, dest_file_id,
&dest_file_info, &dest_platform_file_info, &dest_local_path);
if (error == base::File::FILE_ERROR_NOT_FOUND)
overwrite = false; // fallback to non-overwrite case
else if (error != base::File::FILE_OK)
return error;
else if (dest_file_info.is_directory())
return base::File::FILE_ERROR_INVALID_OPERATION;
}
if (!overwrite) {
FileId dest_parent_id;
if (!db->GetFileWithPath(VirtualPath::DirName(dest_url.path()),
&dest_parent_id)) {
return base::File::FILE_ERROR_NOT_FOUND;
}
if (!dest_file_info.is_directory())
return base::File::FILE_ERROR_FAILED;
InitFileInfo(&dest_file_info, dest_parent_id,
VirtualPath::BaseName(dest_url.path()).value());
}
int64_t growth = src_platform_file_info.size;
if (overwrite)
growth -= dest_platform_file_info.size;
else
growth += UsageForPath(dest_file_info.name.size());
if (!AllocateQuota(context, growth))
return base::File::FILE_ERROR_NO_SPACE;
base::File::Error error;
if (overwrite) {
base::FilePath dest_local_path =
DataPathToLocalPath(dest_url, dest_file_info.data_path);
error = delegate_->CopyOrMoveFile(
src_file_path, dest_local_path, FileSystemOperation::OPTION_NONE,
delegate_->CopyOrMoveModeForDestination(dest_url, true /* copy */));
} else {
error = CreateFile(context, src_file_path, dest_url, &dest_file_info);
}
if (error != base::File::FILE_OK)
return error;
if (overwrite) {
context->change_observers()->Notify(&FileChangeObserver::OnModifyFile,
dest_url);
} else {
context->change_observers()->Notify(&FileChangeObserver::OnCreateFile,
dest_url);
}
UpdateUsage(context, dest_url, growth);
TouchDirectory(db, dest_file_info.parent_id);
return base::File::FILE_OK;
}
base::File::Error ObfuscatedFileUtil::DeleteFile(
FileSystemOperationContext* context,
const FileSystemURL& url) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, true);
if (!db)
return base::File::FILE_ERROR_FAILED;
FileId file_id;
if (!db->GetFileWithPath(url.path(), &file_id))
return base::File::FILE_ERROR_NOT_FOUND;
FileInfo file_info;
base::File::Info platform_file_info;
base::FilePath local_path;
base::File::Error error = GetFileInfoInternal(
db, context, url, file_id, &file_info, &platform_file_info, &local_path);
if (error != base::File::FILE_ERROR_NOT_FOUND &&
error != base::File::FILE_OK)
return error;
if (file_info.is_directory())
return base::File::FILE_ERROR_NOT_A_FILE;
int64_t growth =
-UsageForPath(file_info.name.size()) - platform_file_info.size;
AllocateQuota(context, growth);
if (!db->RemoveFileInfo(file_id)) {
NOTREACHED();
return base::File::FILE_ERROR_FAILED;
}
UpdateUsage(context, url, growth);
TouchDirectory(db, file_info.parent_id);
context->change_observers()->Notify(&FileChangeObserver::OnRemoveFile, url);
if (error == base::File::FILE_ERROR_NOT_FOUND)
return base::File::FILE_OK;
error = delegate_->DeleteFile(local_path);
if (base::File::FILE_OK != error)
LOG(WARNING) << "Leaked a backing file.";
return base::File::FILE_OK;
}
base::File::Error ObfuscatedFileUtil::DeleteDirectory(
FileSystemOperationContext* context,
const FileSystemURL& url) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, true);
if (!db)
return base::File::FILE_ERROR_FAILED;
FileId file_id;
if (!db->GetFileWithPath(url.path(), &file_id))
return base::File::FILE_ERROR_NOT_FOUND;
FileInfo file_info;
if (!db->GetFileInfo(file_id, &file_info)) {
NOTREACHED();
return base::File::FILE_ERROR_FAILED;
}
if (!file_info.is_directory())
return base::File::FILE_ERROR_NOT_A_DIRECTORY;
if (!db->RemoveFileInfo(file_id))
return base::File::FILE_ERROR_NOT_EMPTY;
int64_t growth = -UsageForPath(file_info.name.size());
AllocateQuota(context, growth);
UpdateUsage(context, url, growth);
TouchDirectory(db, file_info.parent_id);
context->change_observers()->Notify(&FileChangeObserver::OnRemoveDirectory,
url);
return base::File::FILE_OK;
}
storage::ScopedFile ObfuscatedFileUtil::CreateSnapshotFile(
FileSystemOperationContext* context,
const FileSystemURL& url,
base::File::Error* error,
base::File::Info* file_info,
base::FilePath* platform_path) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// We're just returning the local file information.
*error = GetFileInfo(context, url, file_info, platform_path);
if (*error == base::File::FILE_OK && file_info->is_directory) {
*file_info = base::File::Info();
*error = base::File::FILE_ERROR_NOT_A_FILE;
}
// An empty ScopedFile does not have any on-disk operation, therefore it can
// be handled the same way by on-disk and in-memory implementations.
return storage::ScopedFile();
}
std::unique_ptr<FileSystemFileUtil::AbstractFileEnumerator>
ObfuscatedFileUtil::CreateFileEnumerator(FileSystemOperationContext* context,
const FileSystemURL& root_url,
bool recursive) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
SandboxDirectoryDatabase* db = GetDirectoryDatabase(root_url, false);
if (!db) {
return std::unique_ptr<AbstractFileEnumerator>(new EmptyFileEnumerator());
}
return std::unique_ptr<AbstractFileEnumerator>(
new ObfuscatedFileEnumerator(db, context, this, root_url, recursive));
}
bool ObfuscatedFileUtil::IsDirectoryEmpty(
FileSystemOperationContext* context,
const FileSystemURL& url) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, false);
if (!db)
return true; // Not a great answer, but it's what others do.
FileId file_id;
if (!db->GetFileWithPath(url.path(), &file_id))
return true; // Ditto.
FileInfo file_info;
if (!db->GetFileInfo(file_id, &file_info)) {
DCHECK(!file_id);
// It's the root directory and the database hasn't been initialized yet.
return true;
}
if (!file_info.is_directory())
return true;
std::vector<FileId> children;
// TODO(ericu): This could easily be made faster with help from the database.
if (!db->ListChildren(file_id, &children))
return true;
return children.empty();
}
base::FilePath ObfuscatedFileUtil::GetDirectoryForOriginAndType(
const GURL& origin,
const std::string& type_string,
bool create,
base::File::Error* error_code) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
base::FilePath origin_dir = GetDirectoryForOrigin(origin, create, error_code);
if (origin_dir.empty())
return base::FilePath();
if (type_string.empty())
return origin_dir;
base::FilePath path = origin_dir.AppendASCII(type_string);
base::File::Error error = base::File::FILE_OK;
if (!delegate_->DirectoryExists(path) &&
(!create || delegate_->CreateDirectory(path, false /* exclusive */,
true /* recursive */) !=
base::File::FILE_OK)) {
error = create ?
base::File::FILE_ERROR_FAILED :
base::File::FILE_ERROR_NOT_FOUND;
}
if (error_code)
*error_code = error;
return path;
}
bool ObfuscatedFileUtil::DeleteDirectoryForOriginAndType(
const GURL& origin,
const std::string& type_string) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DestroyDirectoryDatabase(origin, type_string);
const base::FilePath origin_path =
GetDirectoryForOrigin(origin, false, nullptr);
if (origin_path.empty())
return true;
if (!type_string.empty()) {
// Delete the filesystem type directory.
base::File::Error error = base::File::FILE_OK;
const base::FilePath origin_type_path =
GetDirectoryForOriginAndType(origin, type_string, false, &error);
if (error == base::File::FILE_ERROR_FAILED)
return false;
if (error == base::File::FILE_OK && !origin_type_path.empty() &&
!delegate_->DeleteFileOrDirectory(origin_type_path,
true /* recursive */)) {
return false;
}
// At this point we are sure we had successfully deleted the origin/type
// directory (i.e. we're ready to just return true).
// See if we have other directories in this origin directory.
for (const std::string& type : known_type_strings_) {
if (type == type_string)
continue;
if (delegate_->DirectoryExists(origin_path.AppendASCII(type))) {
// Other type's directory exists; just return true here.
return true;
}
}
}
// No other directories seem exist. Try deleting the entire origin directory.
InitOriginDatabase(origin, false);
if (origin_database_) {
origin_database_->RemovePathForOrigin(
storage::GetIdentifierFromOrigin(origin));
}
return delegate_->DeleteFileOrDirectory(origin_path, true /* recursive */);
}
void ObfuscatedFileUtil::CloseFileSystemForOriginAndType(
const GURL& origin,
const std::string& type_string) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
const std::string key_prefix = GetDirectoryDatabaseKey(origin, type_string);
for (auto iter = directories_.lower_bound(key_prefix);
iter != directories_.end();) {
if (!base::StartsWith(iter->first, key_prefix,
base::CompareCase::SENSITIVE))
break;
DCHECK(type_string.empty() || iter->first == key_prefix);
directories_.erase(iter++);
}
}
std::unique_ptr<ObfuscatedFileUtil::AbstractOriginEnumerator>
ObfuscatedFileUtil::CreateOriginEnumerator() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
std::vector<SandboxOriginDatabase::OriginRecord> origins;
InitOriginDatabase(GURL(), false);
return std::make_unique<ObfuscatedOriginEnumerator>(origin_database_.get(),
file_system_directory_);
}
void ObfuscatedFileUtil::DestroyDirectoryDatabase(
const GURL& origin,
const std::string& type_string) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// If |type_string| is empty, delete all filesystem types under |origin|.
const std::string key_prefix = GetDirectoryDatabaseKey(origin, type_string);
for (auto iter = directories_.lower_bound(key_prefix);
iter != directories_.end();) {
if (!base::StartsWith(iter->first, key_prefix,
base::CompareCase::SENSITIVE))
break;
DCHECK(type_string.empty() || iter->first == key_prefix);
std::unique_ptr<SandboxDirectoryDatabase> database =
std::move(iter->second);
directories_.erase(iter++);
// Continue to destroy databases even if it failed because it doesn't affect
// the final result.
database->DestroyDatabase();
}
}
// static
int64_t ObfuscatedFileUtil::ComputeFilePathCost(const base::FilePath& path) {
return UsageForPath(VirtualPath::BaseName(path).value().size());
}
void ObfuscatedFileUtil::MaybePrepopulateDatabase(
const std::vector<std::string>& type_strings_to_prepopulate) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
SandboxPrioritizedOriginDatabase database(file_system_directory_,
env_override_);
std::string origin_string = database.GetPrimaryOrigin();
if (origin_string.empty() || !database.HasOriginPath(origin_string))
return;
const GURL origin = storage::GetOriginURLFromIdentifier(origin_string);
// Prepopulate the directory database(s) if and only if this instance
// has primary origin and the directory database is already there.
for (size_t i = 0; i < type_strings_to_prepopulate.size(); ++i) {
const std::string type_string = type_strings_to_prepopulate[i];
// Only handles known types.
if (!base::ContainsKey(known_type_strings_, type_string))
continue;
base::File::Error error = base::File::FILE_ERROR_FAILED;
base::FilePath path = GetDirectoryForOriginAndType(
origin, type_string, false, &error);
if (error != base::File::FILE_OK)
continue;
std::unique_ptr<SandboxDirectoryDatabase> db =
std::make_unique<SandboxDirectoryDatabase>(path, env_override_);
if (db->Init(SandboxDirectoryDatabase::FAIL_ON_CORRUPTION)) {
directories_[GetDirectoryDatabaseKey(origin, type_string)] =
std::move(db);
MarkUsed();
// Don't populate more than one database, as it may rather hurt
// performance.
break;
}
}
}
base::FilePath ObfuscatedFileUtil::GetDirectoryForURL(
const FileSystemURL& url,
bool create,
base::File::Error* error_code) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return GetDirectoryForOriginAndType(
url.origin().GetURL(), CallGetTypeStringForURL(url), create, error_code);
}
std::string ObfuscatedFileUtil::CallGetTypeStringForURL(
const FileSystemURL& url) {
DCHECK(!get_type_string_for_url_.is_null());
return get_type_string_for_url_.Run(url);
}
base::File::Error ObfuscatedFileUtil::GetFileInfoInternal(
SandboxDirectoryDatabase* db,
FileSystemOperationContext* context,
const FileSystemURL& url,
FileId file_id,
FileInfo* local_info,
base::File::Info* file_info,
base::FilePath* platform_file_path) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(db);
DCHECK(context);
DCHECK(file_info);
DCHECK(platform_file_path);
if (!db->GetFileInfo(file_id, local_info)) {
NOTREACHED();
return base::File::FILE_ERROR_FAILED;
}
if (local_info->is_directory()) {
file_info->size = 0;
file_info->is_directory = true;
file_info->is_symbolic_link = false;
file_info->last_modified = local_info->modification_time;
*platform_file_path = base::FilePath();
// We don't fill in ctime or atime.
return base::File::FILE_OK;
}
if (local_info->data_path.empty())
return base::File::FILE_ERROR_INVALID_OPERATION;
base::FilePath local_path = DataPathToLocalPath(url, local_info->data_path);
base::File::Error error = delegate_->GetFileInfo(local_path, file_info);
// We should not follow symbolic links in sandboxed file system.
if (delegate_->IsLink(local_path)) {
LOG(WARNING) << "Found a symbolic file.";
error = base::File::FILE_ERROR_NOT_FOUND;
}
if (error == base::File::FILE_OK) {
*platform_file_path = local_path;
} else if (error == base::File::FILE_ERROR_NOT_FOUND) {
LOG(WARNING) << "Lost a backing file.";
InvalidateUsageCache(context, url.origin(), url.type());
if (!db->RemoveFileInfo(file_id))
return base::File::FILE_ERROR_FAILED;
}
return error;
}
base::File ObfuscatedFileUtil::CreateAndOpenFile(
FileSystemOperationContext* context,
const FileSystemURL& dest_url,
FileInfo* dest_file_info, int file_flags) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
SandboxDirectoryDatabase* db = GetDirectoryDatabase(dest_url, true);
base::FilePath root, dest_local_path;
base::File::Error error = GenerateNewLocalPath(db, context, dest_url, &root,
&dest_local_path);
if (error != base::File::FILE_OK)
return base::File(error);
if (delegate_->PathExists(dest_local_path)) {
if (!delegate_->DeleteFileOrDirectory(dest_local_path,
false /* recursive */))
return base::File(base::File::FILE_ERROR_FAILED);
LOG(WARNING) << "A stray file detected";
InvalidateUsageCache(context, dest_url.origin(), dest_url.type());
}
base::File file = delegate_->CreateOrOpen(dest_local_path, file_flags);
if (!file.IsValid())
return file;
if (!file.created()) {
file.Close();
delegate_->DeleteFile(dest_local_path);
return base::File(base::File::FILE_ERROR_FAILED);
}
error = CommitCreateFile(root, dest_local_path, db, dest_file_info);
if (error != base::File::FILE_OK) {
file.Close();
delegate_->DeleteFile(dest_local_path);
return base::File(error);
}
return file;
}
base::File::Error ObfuscatedFileUtil::CreateFile(
FileSystemOperationContext* context,
const base::FilePath& src_file_path,
const FileSystemURL& dest_url,
FileInfo* dest_file_info) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
SandboxDirectoryDatabase* db = GetDirectoryDatabase(dest_url, true);
base::FilePath root, dest_local_path;
base::File::Error error = GenerateNewLocalPath(db, context, dest_url, &root,
&dest_local_path);
if (error != base::File::FILE_OK)
return error;
bool created = false;
if (src_file_path.empty()) {
if (delegate_->PathExists(dest_local_path)) {
if (!delegate_->DeleteFileOrDirectory(dest_local_path,
false /* recursive */))
return base::File::FILE_ERROR_FAILED;
LOG(WARNING) << "A stray file detected";
InvalidateUsageCache(context, dest_url.origin(), dest_url.type());
}
error = delegate_->EnsureFileExists(dest_local_path, &created);
} else {
error = delegate_->CopyOrMoveFile(
src_file_path, dest_local_path, FileSystemOperation::OPTION_NONE,
delegate_->CopyOrMoveModeForDestination(dest_url, true /* copy */));
created = true;
}
if (error != base::File::FILE_OK)
return error;
if (!created)
return base::File::FILE_ERROR_FAILED;
return CommitCreateFile(root, dest_local_path, db, dest_file_info);
}
base::File::Error ObfuscatedFileUtil::CommitCreateFile(
const base::FilePath& root,
const base::FilePath& local_path,
SandboxDirectoryDatabase* db,
FileInfo* dest_file_info) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// This removes the root, including the trailing slash, leaving a relative
// path.
dest_file_info->data_path = base::FilePath(
local_path.value().substr(root.value().length() + 1));
FileId file_id;
base::File::Error error = db->AddFileInfo(*dest_file_info, &file_id);
if (error != base::File::FILE_OK)
return error;
TouchDirectory(db, dest_file_info->parent_id);
return base::File::FILE_OK;
}
base::FilePath ObfuscatedFileUtil::DataPathToLocalPath(
const FileSystemURL& url, const base::FilePath& data_path) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
base::File::Error error = base::File::FILE_OK;
base::FilePath root = GetDirectoryForURL(url, false, &error);
if (error != base::File::FILE_OK)
return base::FilePath();
return root.Append(data_path);
}
std::string ObfuscatedFileUtil::GetDirectoryDatabaseKey(
const GURL& origin, const std::string& type_string) {
// For isolated origin we just use a type string as a key.
return storage::GetIdentifierFromOrigin(origin) +
kDirectoryDatabaseKeySeparator + type_string;
}
// TODO(ericu): How to do the whole validation-without-creation thing?
// We may not have quota even to create the database.
// Ah, in that case don't even get here?
// Still doesn't answer the quota issue, though.
SandboxDirectoryDatabase* ObfuscatedFileUtil::GetDirectoryDatabase(
const FileSystemURL& url, bool create) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
std::string key = GetDirectoryDatabaseKey(url.origin().GetURL(),
CallGetTypeStringForURL(url));
if (key.empty())
return nullptr;
auto iter = directories_.find(key);
if (iter != directories_.end()) {
MarkUsed();
return iter->second.get();
}
base::File::Error error = base::File::FILE_OK;
base::FilePath path = GetDirectoryForURL(url, create, &error);
if (error != base::File::FILE_OK) {
LOG(WARNING) << "Failed to get origin+type directory: "
<< url.DebugString() << " error:" << error;
return nullptr;
}
MarkUsed();
directories_[key] =
std::make_unique<SandboxDirectoryDatabase>(path, env_override_);
return directories_[key].get();
}
base::FilePath ObfuscatedFileUtil::GetDirectoryForOrigin(
const GURL& origin, bool create, base::File::Error* error_code) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!InitOriginDatabase(origin, create)) {
if (error_code) {
*error_code = create ?
base::File::FILE_ERROR_FAILED :
base::File::FILE_ERROR_NOT_FOUND;
}
return base::FilePath();
}
base::FilePath directory_name;
std::string id = storage::GetIdentifierFromOrigin(origin);
bool exists_in_db = origin_database_->HasOriginPath(id);
if (!exists_in_db && !create) {
if (error_code)
*error_code = base::File::FILE_ERROR_NOT_FOUND;
return base::FilePath();
}
if (!origin_database_->GetPathForOrigin(id, &directory_name)) {
if (error_code)
*error_code = base::File::FILE_ERROR_FAILED;
return base::FilePath();
}
base::FilePath path = file_system_directory_.Append(directory_name);
bool exists_in_fs = delegate_->DirectoryExists(path);
if (!exists_in_db && exists_in_fs) {
if (!delegate_->DeleteFileOrDirectory(path, true)) {
if (error_code)
*error_code = base::File::FILE_ERROR_FAILED;
return base::FilePath();
}
exists_in_fs = false;
}
if (!exists_in_fs) {
if (!create || delegate_->CreateDirectory(path, false /* exclusive */,
true /* recursive */) !=
base::File::FILE_OK) {
if (error_code)
*error_code = create ?
base::File::FILE_ERROR_FAILED :
base::File::FILE_ERROR_NOT_FOUND;
return base::FilePath();
}
}
if (error_code)
*error_code = base::File::FILE_OK;
return path;
}
void ObfuscatedFileUtil::InvalidateUsageCache(
FileSystemOperationContext* context,
const url::Origin& origin,
FileSystemType type) {
if (sandbox_delegate_)
sandbox_delegate_->InvalidateUsageCache(origin.GetURL(), type);
}
void ObfuscatedFileUtil::MarkUsed() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (timer_.IsRunning()) {
timer_.Reset();
} else {
timer_.Start(FROM_HERE,
base::TimeDelta::FromSeconds(db_flush_delay_seconds_),
base::BindOnce(&ObfuscatedFileUtil::DropDatabases,
base::Unretained(this)));
}
}
void ObfuscatedFileUtil::DropDatabases() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
origin_database_.reset();
directories_.clear();
timer_.Stop();
}
void ObfuscatedFileUtil::RewriteDatabases() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (origin_database_)
origin_database_->RewriteDatabase();
}
bool ObfuscatedFileUtil::InitOriginDatabase(const GURL& origin_hint,
bool create) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (origin_database_)
return true;
if (!delegate_->DirectoryExists(file_system_directory_)) {
if (!create)
return false;
if (delegate_->CreateDirectory(
file_system_directory_, false /* exclusive */,
true /* recursive */) != base::File::FILE_OK) {
LOG(WARNING) << "Failed to create FileSystem directory: "
<< file_system_directory_.value();
return false;
}
}
SandboxPrioritizedOriginDatabase* prioritized_origin_database =
new SandboxPrioritizedOriginDatabase(file_system_directory_,
env_override_);
origin_database_.reset(prioritized_origin_database);
if (origin_hint.is_empty() || !HasIsolatedStorage(origin_hint))
return true;
const std::string isolated_origin_string =
storage::GetIdentifierFromOrigin(origin_hint);
prioritized_origin_database->InitializePrimaryOrigin(
isolated_origin_string);
return true;
}
base::File::Error ObfuscatedFileUtil::GenerateNewLocalPath(
SandboxDirectoryDatabase* db,
FileSystemOperationContext* context,
const FileSystemURL& url,
base::FilePath* root,
base::FilePath* local_path) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(local_path);
int64_t number;
if (!db || !db->GetNextInteger(&number))
return base::File::FILE_ERROR_FAILED;
base::File::Error error = base::File::FILE_OK;
*root = GetDirectoryForURL(url, false, &error);
if (error != base::File::FILE_OK)
return error;
// We use the third- and fourth-to-last digits as the directory.
int64_t directory_number = number % 10000 / 100;
base::FilePath new_local_path = root->AppendASCII(
base::StringPrintf("%02" PRId64, directory_number));
error = delegate_->CreateDirectory(new_local_path, false /* exclusive */,
false /* recursive */);
if (error != base::File::FILE_OK)
return error;
*local_path =
new_local_path.AppendASCII(base::StringPrintf("%08" PRId64, number));
return base::File::FILE_OK;
}
base::File ObfuscatedFileUtil::CreateOrOpenInternal(
FileSystemOperationContext* context,
const FileSystemURL& url, int file_flags) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(!(file_flags & (base::File::FLAG_DELETE_ON_CLOSE |
base::File::FLAG_HIDDEN | base::File::FLAG_EXCLUSIVE_READ |
base::File::FLAG_EXCLUSIVE_WRITE)));
SandboxDirectoryDatabase* db = GetDirectoryDatabase(url, true);
if (!db)
return base::File(base::File::FILE_ERROR_FAILED);
FileId file_id;
if (!db->GetFileWithPath(url.path(), &file_id)) {
// The file doesn't exist.
if (!(file_flags & (base::File::FLAG_CREATE |
base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_OPEN_ALWAYS))) {
return base::File(base::File::FILE_ERROR_NOT_FOUND);
}
FileId parent_id;
if (!db->GetFileWithPath(VirtualPath::DirName(url.path()), &parent_id))
return base::File(base::File::FILE_ERROR_NOT_FOUND);
FileInfo file_info;
InitFileInfo(&file_info, parent_id,
VirtualPath::BaseName(url.path()).value());
int64_t growth = UsageForPath(file_info.name.size());
if (!AllocateQuota(context, growth))
return base::File(base::File::FILE_ERROR_NO_SPACE);
base::File file = CreateAndOpenFile(context, url, &file_info, file_flags);
if (file.IsValid()) {
UpdateUsage(context, url, growth);
context->change_observers()->Notify(&FileChangeObserver::OnCreateFile,
url);
}
return file;
}
if (file_flags & base::File::FLAG_CREATE)
return base::File(base::File::FILE_ERROR_EXISTS);
base::File::Info platform_file_info;
base::FilePath local_path;
FileInfo file_info;
base::File::Error error = GetFileInfoInternal(
db, context, url, file_id, &file_info, &platform_file_info, &local_path);
if (error != base::File::FILE_OK)
return base::File(error);
if (file_info.is_directory())
return base::File(base::File::FILE_ERROR_NOT_A_FILE);
int64_t delta = 0;
if (file_flags & (base::File::FLAG_CREATE_ALWAYS |
base::File::FLAG_OPEN_TRUNCATED)) {
// The file exists and we're truncating.
delta = -platform_file_info.size;
AllocateQuota(context, delta);
}
base::File file = delegate_->CreateOrOpen(local_path, file_flags);
if (!file.IsValid()) {
error = file.error_details();
if (error == base::File::FILE_ERROR_NOT_FOUND) {
// TODO(tzik): Also invalidate on-memory usage cache in UsageTracker.
// TODO(tzik): Delete database entry after ensuring the file lost.
InvalidateUsageCache(context, url.origin(), url.type());
LOG(WARNING) << "Lost a backing file.";
return base::File(base::File::FILE_ERROR_FAILED);
}
return file;
}
// If truncating we need to update the usage.
if (delta) {
UpdateUsage(context, url, delta);
context->change_observers()->Notify(&FileChangeObserver::OnModifyFile, url);
}
return file;
}
bool ObfuscatedFileUtil::HasIsolatedStorage(const GURL& origin) {
return special_storage_policy_.get() &&
special_storage_policy_->HasIsolatedStorage(origin);
}
} // namespace storage