SyncFS: Introduce SyncFileSystemBackend

webkit/browser/fileapi/syncable/sync_file_system_backend.cc

+// Copyright 2013 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 "webkit/browser/fileapi/syncable/sync_file_system_backend.h"
+
+#include "base/logging.h"
+#include "webkit/browser/fileapi/async_file_util_adapter.h"
+#include "webkit/browser/fileapi/file_system_context.h"
+#include "webkit/browser/fileapi/file_system_file_stream_reader.h"
+#include "webkit/browser/fileapi/file_system_operation_impl.h"
+#include "webkit/browser/fileapi/obfuscated_file_util.h"
+#include "webkit/browser/fileapi/sandbox_file_stream_writer.h"
+#include "webkit/browser/fileapi/sandbox_quota_observer.h"
+#include "webkit/browser/fileapi/syncable/syncable_file_system_operation.h"
+#include "webkit/browser/fileapi/syncable/syncable_file_system_util.h"
+#include "webkit/common/fileapi/file_system_util.h"
+
+namespace sync_file_system {
+
+SyncFileSystemBackend::SyncFileSystemBackend()
+    : sandbox_context_(NULL) {
+}
+
+SyncFileSystemBackend::~SyncFileSystemBackend() {
+}
+
+bool SyncFileSystemBackend::CanHandleType(
+    fileapi::FileSystemType type) const {
+  return type == fileapi::kFileSystemTypeSyncable ||
+         type == fileapi::kFileSystemTypeSyncableForInternalSync;
+}
+
+void SyncFileSystemBackend::Initialize(fileapi::FileSystemContext* context) {
+  DCHECK(context);
+  DCHECK(!sandbox_context_);
+  sandbox_context_ = context->sandbox_context();
+  update_observers_ = update_observers_.AddObserver(
+      sandbox_context_->quota_observer(),
+      sandbox_context_->file_task_runner());
+  syncable_update_observers_ = syncable_update_observers_.AddObserver(
+      sandbox_context_->quota_observer(),
+      sandbox_context_->file_task_runner());
+}
+
+void SyncFileSystemBackend::OpenFileSystem(
+    const GURL& origin_url,
+    fileapi::FileSystemType type,
+    fileapi::OpenFileSystemMode mode,
+    const OpenFileSystemCallback& callback) {
+  DCHECK(CanHandleType(type));
+  DCHECK(sandbox_context_);
+  sandbox_context_->OpenFileSystem(
+      origin_url, type, mode, callback,
+      GetSyncableFileSystemRootURI(origin_url));
+}
+
+fileapi::FileSystemFileUtil* SyncFileSystemBackend::GetFileUtil(
+    fileapi::FileSystemType type) {
+  DCHECK(sandbox_context_);
+  return sandbox_context_->sync_file_util();
+}
+
+fileapi::AsyncFileUtil* SyncFileSystemBackend::GetAsyncFileUtil(
+    fileapi::FileSystemType type) {
+  DCHECK(sandbox_context_);
+  return sandbox_context_->file_util();
+}
+
+fileapi::CopyOrMoveFileValidatorFactory*
+SyncFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
+    fileapi::FileSystemType type,
+    base::PlatformFileError* error_code) {
+  DCHECK(error_code);
+  *error_code = base::PLATFORM_FILE_OK;
+  return NULL;
+}
+
+fileapi::FileSystemOperation*
+SyncFileSystemBackend::CreateFileSystemOperation(
+    const fileapi::FileSystemURL& url,
+    fileapi::FileSystemContext* context,
+    base::PlatformFileError* error_code) const {
+  DCHECK(CanHandleType(url.type()));
+  DCHECK(context);
+  DCHECK(error_code);
+  if (!sandbox_context_->IsAccessValid(url)) {
+    *error_code = base::PLATFORM_FILE_ERROR_SECURITY;
+    return NULL;
+  }
+
+  scoped_ptr<fileapi::FileSystemOperationContext> operation_context(
+      new fileapi::FileSystemOperationContext(context));
+
+  if (url.type() == fileapi::kFileSystemTypeSyncableForInternalSync) {
+    operation_context->set_update_observers(update_observers_);
+    operation_context->set_change_observers(change_observers_);
+    return new fileapi::FileSystemOperationImpl(
+        url, context, operation_context.Pass());
+  }
+
+  operation_context->set_update_observers(syncable_update_observers_);
+  operation_context->set_change_observers(syncable_change_observers_);
+  return new SyncableFileSystemOperation(
+      url, context, operation_context.Pass());
+}
+
+scoped_ptr<webkit_blob::FileStreamReader>
+SyncFileSystemBackend::CreateFileStreamReader(
+    const fileapi::FileSystemURL& url,
+    int64 offset,
+    const base::Time& expected_modification_time,
+    fileapi::FileSystemContext* context) const {
+  DCHECK(CanHandleType(url.type()));
+  if (!sandbox_context_->IsAccessValid(url))
+    return scoped_ptr<webkit_blob::FileStreamReader>();
+  return scoped_ptr<webkit_blob::FileStreamReader>(
+      new fileapi::FileSystemFileStreamReader(
+          context, url, offset, expected_modification_time));
+}
+
+scoped_ptr<fileapi::FileStreamWriter>
+SyncFileSystemBackend::CreateFileStreamWriter(
+    const fileapi::FileSystemURL& url,
+    int64 offset,
+    fileapi::FileSystemContext* context) const {
+  DCHECK(CanHandleType(url.type()));
+  if (!sandbox_context_->IsAccessValid(url))
+    return scoped_ptr<fileapi::FileStreamWriter>();
+  return scoped_ptr<fileapi::FileStreamWriter>(
+      new fileapi::SandboxFileStreamWriter(
+          context, url, offset, update_observers_));
+}
+
+fileapi::FileSystemQuotaUtil* SyncFileSystemBackend::GetQuotaUtil() {
+  return this;
+}
+
+base::PlatformFileError SyncFileSystemBackend::DeleteOriginDataOnFileThread(
+    fileapi::FileSystemContext* context,
+    quota::QuotaManagerProxy* proxy,
+    const GURL& origin_url,
+    fileapi::FileSystemType type) {
+  DCHECK(CanHandleType(type));
+  DCHECK(sandbox_context_);
+  return sandbox_context_->DeleteOriginDataOnFileThread(
+      context, proxy, origin_url, type);
+}
+
+void SyncFileSystemBackend::GetOriginsForTypeOnFileThread(
+    fileapi::FileSystemType type,
+    std::set<GURL>* origins) {
+  DCHECK(CanHandleType(type));
+  DCHECK(sandbox_context_);
+  sandbox_context_->GetOriginsForTypeOnFileThread(type, origins);
+}
+
+void SyncFileSystemBackend::GetOriginsForHostOnFileThread(
+    fileapi::FileSystemType type,
+    const std::string& host,
+    std::set<GURL>* origins) {
+  DCHECK(CanHandleType(type));
+  DCHECK(sandbox_context_);
+  sandbox_context_->GetOriginsForHostOnFileThread(type, host, origins);
+}
+
+int64 SyncFileSystemBackend::GetOriginUsageOnFileThread(
+    fileapi::FileSystemContext* context,
+    const GURL& origin_url,
+    fileapi::FileSystemType type) {
+  DCHECK(CanHandleType(type));
+  DCHECK(sandbox_context_);
+  return sandbox_context_->GetOriginUsageOnFileThread(
+      context, origin_url, type);
+}
+
+void SyncFileSystemBackend::InvalidateUsageCache(
+    const GURL& origin_url,
+    fileapi::FileSystemType type) {
+  DCHECK(CanHandleType(type));
+  DCHECK(sandbox_context_);
+  sandbox_context_->InvalidateUsageCache(origin_url, type);
+}
+
+void SyncFileSystemBackend::StickyInvalidateUsageCache(
+    const GURL& origin_url,
+    fileapi::FileSystemType type) {
+  DCHECK(CanHandleType(type));
+  DCHECK(sandbox_context_);
+  sandbox_context_->StickyInvalidateUsageCache(origin_url, type);
+}
+
+void SyncFileSystemBackend::AddFileUpdateObserver(
+    fileapi::FileSystemType type,
+    fileapi::FileUpdateObserver* observer,
+    base::SequencedTaskRunner* task_runner) {
+  DCHECK_EQ(fileapi::kFileSystemTypeSyncable, type);
+  fileapi::UpdateObserverList* list = &syncable_update_observers_;
+  *list = list->AddObserver(observer, task_runner);
+}
+
+void SyncFileSystemBackend::AddFileChangeObserver(
+    fileapi::FileSystemType type,
+    fileapi::FileChangeObserver* observer,
+    base::SequencedTaskRunner* task_runner) {
+  DCHECK_EQ(fileapi::kFileSystemTypeSyncable, type);
+  fileapi::ChangeObserverList* list = &syncable_change_observers_;
+  *list = list->AddObserver(observer, task_runner);
+}
+
+void SyncFileSystemBackend::AddFileAccessObserver(
+    fileapi::FileSystemType type,
+    fileapi::FileAccessObserver* observer,
+    base::SequencedTaskRunner* task_runner) {
+  NOTREACHED() << "SyncFileSystemBackend does not support access observers.";
+}
+
+const fileapi::UpdateObserverList* SyncFileSystemBackend::GetUpdateObservers(
+    fileapi::FileSystemType type) const {
+  DCHECK(CanHandleType(type));
+  if (type != fileapi::kFileSystemTypeSyncable)
+    return NULL;
+  return &syncable_update_observers_;
+}
+
+const fileapi::ChangeObserverList* SyncFileSystemBackend::GetChangeObservers(
+    fileapi::FileSystemType type) const {
+  DCHECK(CanHandleType(type));
+  DCHECK_EQ(fileapi::kFileSystemTypeSyncable, type);
+  if (type != fileapi::kFileSystemTypeSyncable)
+    return NULL;
+  return &syncable_change_observers_;
+}
+
+const fileapi::AccessObserverList* SyncFileSystemBackend::GetAccessObservers(
+    fileapi::FileSystemType type) const {
+  return NULL;
+}
+
+}  // namespace sync_file_system