Isolated FS for media devices.

webkit/fileapi/media/device_media_file_util.cc

Index: webkit/fileapi/media/device_media_file_util.cc
diff --git a/webkit/fileapi/media/device_media_file_util.cc b/webkit/fileapi/media/device_media_file_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..95e2abd55c5e4d07dd8a45238f3e17cb5413a666
--- /dev/null
+++ b/webkit/fileapi/media/device_media_file_util.cc
@@ -0,0 +1,164 @@
+// 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/device_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/isolated_context.h"
+#include "webkit/fileapi/media/media_device_map_service.h"
+#include "webkit/fileapi/media/media_device_interface_impl.h"
+
+using base::PlatformFileError;
+using base::PlatformFileInfo;
+
+namespace fileapi {
+
+DeviceMediaFileUtil::DeviceMediaFileUtil() {
+}
+
+PlatformFileError DeviceMediaFileUtil::CreateOrOpen(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url, int file_flags,
+    PlatformFile* file_handle, bool* created) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError DeviceMediaFileUtil::Close(
+    FileSystemOperationContext* context,
+    PlatformFile file_handle) {
+  // We don't allow open thus Close won't be called.
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError DeviceMediaFileUtil::EnsureFileExists(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    bool* created) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError DeviceMediaFileUtil::CreateDirectory(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    bool exclusive,
+    bool recursive) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError DeviceMediaFileUtil::GetFileInfo(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    PlatformFileInfo* file_info,
+    FilePath* platform_path) {
+  scoped_refptr<MediaDeviceInterfaceImpl> device(context->media_device());
+  if (!device.get())
+    return base::PLATFORM_FILE_ERROR_INVALID_URL;
+  *platform_path = url.path();

[Lei Zhang, 2012/07/27 06:09:15]

This won't work. With the current scheme, the returned path is bogus or it's
relative to a device, and not a path on the real file system. Instead, you
probably need to let MediaDeviceInterfaceImpl::GetFileInfo() write the file data
to a temporary file, and set |platform_path| to that temp file. (I haven't tried
to see if that actually works though)

[Lei Zhang, 2012/07/27 06:18:48]

And now I have confirmed that works. My test extension is serving pictures off
the camera again.

+  return device->GetFileInfo(*platform_path, file_info);
+}
+
+FileSystemFileUtil::AbstractFileEnumerator*
+DeviceMediaFileUtil::CreateFileEnumerator(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    bool recursive) {
+  scoped_refptr<MediaDeviceInterfaceImpl> device(context->media_device());
+  if (!device.get())
+    return new FileSystemFileUtil::EmptyFileEnumerator();
+  return device->CreateFileEnumerator(url.path(), recursive);
+}
+
+PlatformFileError DeviceMediaFileUtil::GetLocalFilePath(
+    FileSystemOperationContext* context,
+    const FileSystemURL& file_system_url,
+    FilePath* local_file_path) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError DeviceMediaFileUtil::Touch(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    const base::Time& last_access_time,
+    const base::Time& last_modified_time) {
+  scoped_refptr<MediaDeviceInterfaceImpl> device(context->media_device());
+  if (!device.get())
+    return base::PLATFORM_FILE_ERROR_INVALID_URL;
+  return device->Touch(url.path(), last_access_time, last_modified_time);
+}
+
+PlatformFileError DeviceMediaFileUtil::Truncate(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    int64 length) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+bool DeviceMediaFileUtil::PathExists(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url) {
+  scoped_refptr<MediaDeviceInterfaceImpl> device(context->media_device());
+  if (!device.get())
+    return false;
+  return device->PathExists(url.path());
+}
+
+bool DeviceMediaFileUtil::DirectoryExists(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url) {
+  scoped_refptr<MediaDeviceInterfaceImpl> device(context->media_device());
+  if (!device.get())
+    return false;
+  return device->DirectoryExists(url.path());
+}
+
+bool DeviceMediaFileUtil::IsDirectoryEmpty(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url) {
+  scoped_refptr<MediaDeviceInterfaceImpl> device(context->media_device());
+  if (!device.get())
+    return false;
+  return device->IsDirectoryEmpty(url.path());
+}
+
+PlatformFileError DeviceMediaFileUtil::CopyOrMoveFile(
+    FileSystemOperationContext* context,
+    const FileSystemURL& src_url,
+    const FileSystemURL& dest_url,
+    bool copy) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError DeviceMediaFileUtil::CopyInForeignFile(
+    FileSystemOperationContext* context,
+    const FilePath& src_file_path,
+    const FileSystemURL& dest_url) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError DeviceMediaFileUtil::DeleteFile(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError DeviceMediaFileUtil::DeleteSingleDirectory(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+scoped_refptr<webkit_blob::ShareableFileReference>
+    DeviceMediaFileUtil::CreateSnapshotFile(
+        FileSystemOperationContext* context,
+        const FileSystemURL& url,
+        base::PlatformFileError* result,
+        base::PlatformFileInfo* file_info,
+        FilePath* platform_path) {
+  return NULL;
+}
+
+}  // namespace fileapi