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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "storage/browser/file_system/isolated_file_system_backend.h"
#include <stdint.h>
#include <memory>
#include <string>
#include <utility>
#include "base/check.h"
#include "base/files/file_path.h"
#include "base/functional/bind.h"
#include "base/notreached.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/single_thread_task_runner.h"
#include "storage/browser/file_system/async_file_util_adapter.h"
#include "storage/browser/file_system/copy_or_move_file_validator.h"
#include "storage/browser/file_system/dragged_file_util.h"
#include "storage/browser/file_system/file_stream_reader.h"
#include "storage/browser/file_system/file_stream_writer.h"
#include "storage/browser/file_system/file_system_context.h"
#include "storage/browser/file_system/file_system_operation.h"
#include "storage/browser/file_system/file_system_operation_context.h"
#include "storage/browser/file_system/isolated_context.h"
#include "storage/browser/file_system/native_file_util.h"
#include "storage/browser/file_system/transient_file_util.h"
#include "storage/browser/file_system/watcher_manager.h"
#include "storage/common/file_system/file_system_types.h"
#include "storage/common/file_system/file_system_util.h"
namespace storage {
IsolatedFileSystemBackend::IsolatedFileSystemBackend(
bool use_for_type_native_local,
bool use_for_type_platform_app)
: use_for_type_native_local_(use_for_type_native_local),
use_for_type_platform_app_(use_for_type_platform_app),
isolated_file_util_(std::make_unique<AsyncFileUtilAdapter>(
std::make_unique<LocalFileUtil>())),
dragged_file_util_(std::make_unique<AsyncFileUtilAdapter>(
std::make_unique<DraggedFileUtil>())),
transient_file_util_(std::make_unique<AsyncFileUtilAdapter>(
std::make_unique<TransientFileUtil>())) {}
IsolatedFileSystemBackend::~IsolatedFileSystemBackend() = default;
bool IsolatedFileSystemBackend::CanHandleType(FileSystemType type) const {
switch (type) {
case kFileSystemTypeIsolated:
case kFileSystemTypeDragged:
case kFileSystemTypeForTransientFile:
return true;
case kFileSystemTypeLocal:
return use_for_type_native_local_;
case kFileSystemTypeLocalForPlatformApp:
return use_for_type_platform_app_;
default:
return false;
}
}
void IsolatedFileSystemBackend::Initialize(FileSystemContext* context) {}
void IsolatedFileSystemBackend::ResolveURL(const FileSystemURL& url,
OpenFileSystemMode mode,
ResolveURLCallback callback) {
// We never allow opening a new isolated FileSystem via usual ResolveURL.
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindOnce(std::move(callback), GURL(), std::string(),
base::File::FILE_ERROR_SECURITY));
}
AsyncFileUtil* IsolatedFileSystemBackend::GetAsyncFileUtil(
FileSystemType type) {
switch (type) {
case kFileSystemTypeLocal:
return isolated_file_util_.get();
case kFileSystemTypeDragged:
return dragged_file_util_.get();
case kFileSystemTypeForTransientFile:
return transient_file_util_.get();
default:
NOTREACHED();
}
}
WatcherManager* IsolatedFileSystemBackend::GetWatcherManager(
FileSystemType type) {
return nullptr;
}
CopyOrMoveFileValidatorFactory*
IsolatedFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
FileSystemType type,
base::File::Error* error_code) {
DCHECK(error_code);
*error_code = base::File::FILE_OK;
return nullptr;
}
std::unique_ptr<FileSystemOperation>
IsolatedFileSystemBackend::CreateFileSystemOperation(
OperationType type,
const FileSystemURL& url,
FileSystemContext* context,
base::File::Error* error_code) const {
return FileSystemOperation::Create(
type, url, context,
std::make_unique<FileSystemOperationContext>(context));
}
bool IsolatedFileSystemBackend::SupportsStreaming(
const FileSystemURL& url) const {
return false;
}
bool IsolatedFileSystemBackend::HasInplaceCopyImplementation(
FileSystemType type) const {
DCHECK(type == kFileSystemTypeLocal || type == kFileSystemTypeDragged ||
type == kFileSystemTypeForTransientFile);
return false;
}
std::unique_ptr<FileStreamReader>
IsolatedFileSystemBackend::CreateFileStreamReader(
const FileSystemURL& url,
int64_t offset,
int64_t max_bytes_to_read,
const base::Time& expected_modification_time,
FileSystemContext* context,
file_access::ScopedFileAccessDelegate::RequestFilesAccessIOCallback
file_access) const {
return FileStreamReader::CreateForLocalFile(
context->default_file_task_runner(), url.path(), offset,
expected_modification_time, std::move(file_access));
}
std::unique_ptr<FileStreamWriter>
IsolatedFileSystemBackend::CreateFileStreamWriter(
const FileSystemURL& url,
int64_t offset,
FileSystemContext* context) const {
return FileStreamWriter::CreateForLocalFile(
context->default_file_task_runner(), url.path(), offset,
FileStreamWriter::OPEN_EXISTING_FILE);
}
FileSystemQuotaUtil* IsolatedFileSystemBackend::GetQuotaUtil() {
// No quota support.
return nullptr;
}
const UpdateObserverList* IsolatedFileSystemBackend::GetUpdateObservers(
FileSystemType type) const {
return nullptr;
}
const ChangeObserverList* IsolatedFileSystemBackend::GetChangeObservers(
FileSystemType type) const {
return nullptr;
}
const AccessObserverList* IsolatedFileSystemBackend::GetAccessObservers(
FileSystemType type) const {
return nullptr;
}
} // namespace storage
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