Isolated FS for media devices.

webkit/fileapi/media_file_util.cc

+// 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 "webkit/fileapi/media_file_util.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "webkit/blob/shareable_file_reference.h"
+#include "webkit/fileapi/file_system_operation_context.h"
+#include "webkit/fileapi/file_system_url.h"
+#include "webkit/fileapi/media_device_map_service.h"
+#include "webkit/fileapi/isolated_context.h"
+
+#if defined(OS_WIN)
+#include "webkit/fileapi/mtp_device_interface_win.h"
+#elif defined(OS_POSIX) && !defined(OS_MACOSX)
+#include "webkit/fileapi/mtp_device_interface_linux.h"
+#endif
+
+using base::PlatformFileError;
+using base::PlatformFileInfo;
+
+namespace fileapi {
+
+namespace {
+
+bool GetPlatformPathAndDeviceForUrl(

[kinuko, 2012/07/26 00:38:06]

Let's call GetMediaDevice in IsolatedMPP::CreateFileSystemOperation(), add a new
field (e.g. media_device) in FileSystemOperationContext and set the field to the
obtained device ptr there.  Then we don't need to call GetDevice in each method
in FileUtil, but instead can just use the given operation context's member field
(e.g. context->media_device()).

We're going to submit this change: http://codereview.chromium.org/10834021/
so that you can set type-specific per-operation data in the
FileSystemOperationContext in CreateFileSystemOperation().

[kmadhusu, 2012/07/27 02:13:41]

Done.

+    const FileSystemURL& url,
+    FilePath* platform_path,
+    scoped_refptr<MediaDeviceInterfaceImpl>* device) {
+  DCHECK(platform_path);
+  std::string filesystem_id;
+  if (!IsolatedContext::GetInstance()->CrackIsolatedPath(
+          url.path(), &filesystem_id, NULL, platform_path)) {
+    return false;
+  }
+
+  FilePath root_path;
+  if (!IsolatedContext::GetInstance()->GetRegisteredPath(filesystem_id,
+                                                         &root_path)) {
+    return false;
+  }
+
+  if (!MediaDeviceMapService::GetInstance()->GetMediaDevice(root_path.value(),
+                                                            device)) {
+    return false;
+  }
+  return true;
+}
+
+}  // namespace
+
+
+MediaFileUtil::MediaFileUtil() {
+}
+
+PlatformFileError MediaFileUtil::CreateOrOpen(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url, int file_flags,
+    PlatformFile* file_handle, bool* created) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError MediaFileUtil::Close(
+    FileSystemOperationContext* context,
+    PlatformFile file_handle) {
+  // We don't allow open thus Close won't be called.
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError MediaFileUtil::EnsureFileExists(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    bool* created) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError MediaFileUtil::CreateDirectory(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    bool exclusive,
+    bool recursive) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError MediaFileUtil::GetFileInfo(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    PlatformFileInfo* file_info,
+    FilePath* platform_path) {
+  scoped_refptr<MediaDeviceInterfaceImpl> device;
+  if (!GetPlatformPathAndDeviceForUrl(url, platform_path, &device))
+    return base::PLATFORM_FILE_ERROR_INVALID_URL;
+  return device->GetFileInfo(*platform_path, file_info);
+}
+
+FileSystemFileUtil::AbstractFileEnumerator*
+MediaFileUtil::CreateFileEnumerator(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    bool recursive) {
+  FilePath platform_path;
+  scoped_refptr<MediaDeviceInterfaceImpl> device;
+  if (!GetPlatformPathAndDeviceForUrl(url, &platform_path, &device))
+    return new FileSystemFileUtil::EmptyFileEnumerator();
+  return device->CreateFileEnumerator(platform_path, recursive);
+}
+
+PlatformFileError MediaFileUtil::GetLocalFilePath(
+    FileSystemOperationContext* context,
+    const FileSystemURL& file_system_url,
+    FilePath* local_file_path) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError MediaFileUtil::Touch(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    const base::Time& last_access_time,
+    const base::Time& last_modified_time) {
+  FilePath platform_path;
+  scoped_refptr<MediaDeviceInterfaceImpl> device;
+  if (!GetPlatformPathAndDeviceForUrl(url, &platform_path, &device))
+    return base::PLATFORM_FILE_ERROR_INVALID_URL;
+  return device->Touch(platform_path, last_access_time, last_modified_time);
+}
+
+PlatformFileError MediaFileUtil::Truncate(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    int64 length) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+bool MediaFileUtil::PathExists(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url) {
+  FilePath platform_path;
+  scoped_refptr<MediaDeviceInterfaceImpl> device;
+  if (!GetPlatformPathAndDeviceForUrl(url, &platform_path, &device))
+    return false;
+  return device->PathExists(platform_path);
+}
+
+bool MediaFileUtil::DirectoryExists(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url) {
+  FilePath platform_path;
+  scoped_refptr<MediaDeviceInterfaceImpl> device;
+  if (!GetPlatformPathAndDeviceForUrl(url, &platform_path, &device))
+    return false;
+  return device->DirectoryExists(platform_path);
+}
+
+bool MediaFileUtil::IsDirectoryEmpty(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url) {
+  FilePath platform_path;
+  scoped_refptr<MediaDeviceInterfaceImpl> device;
+  if (!GetPlatformPathAndDeviceForUrl(url, &platform_path, &device))
+    return false;
+  return device->IsDirectoryEmpty(platform_path);
+}
+
+PlatformFileError MediaFileUtil::CopyOrMoveFile(
+    FileSystemOperationContext* context,
+    const FileSystemURL& src_url,
+    const FileSystemURL& dest_url,
+    bool copy) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError MediaFileUtil::CopyInForeignFile(
+    FileSystemOperationContext* context,
+    const FilePath& src_file_path,
+    const FileSystemURL& dest_url) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError MediaFileUtil::DeleteFile(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError MediaFileUtil::DeleteSingleDirectory(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+scoped_refptr<webkit_blob::ShareableFileReference>
+    MediaFileUtil::CreateSnapshotFile(
+        FileSystemOperationContext* context,
+        const FileSystemURL& url,
+        base::PlatformFileError* result,
+        base::PlatformFileInfo* file_info,
+        FilePath* platform_path) {
+  return NULL;
+}
+
+}  // namespace fileapi