Implement media path filter

webkit/fileapi/media/local_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/local_media_file_util.h"
+
+#include "net/base/mime_util.h"
+#include "webkit/fileapi/file_system_operation_context.h"
+#include "webkit/fileapi/media/media_path_filter.h"
+
+using base::PlatformFileError;
+using base::PlatformFileInfo;
+
+namespace fileapi {
+
+class MediaPathFilter;
+
+namespace {
+
+class FilteringFileEnumerator
+    : public FileSystemFileUtil::AbstractFileEnumerator {
+ public:
+  FilteringFileEnumerator(
+      scoped_ptr<FileSystemFileUtil::AbstractFileEnumerator> base_enumerator,
+      MediaPathFilter* filter)
+      : base_enumerator_(base_enumerator.Pass()),
+        filter_(filter) {
+  }
+
+  virtual FilePath Next() OVERRIDE {
+    {
+      FilePath next = base_enumerator_->Next();
+      if (next.empty() ||
+          base_enumerator_->IsDirectory() ||
+          filter_->Match(next))
+        return next;
+    }

[kinuko, 2012/07/26 20:21:56]

Why is this in a separate blocK?

[tzik, 2012/07/27 17:18:56]

I think, this block makes Next() call tail recursion.

[kinuko, 2012/07/28 01:23:35]

Ah oh ok :) clever.

+    return Next();

[kinuko, 2012/07/26 20:21:56]

Can we make this non-recursive?

[tzik, 2012/07/27 17:18:56]

Done.

+  }
+
+  virtual int64 Size() OVERRIDE {
+    return base_enumerator_->Size();
+  }
+
+  virtual base::Time LastModifiedTime() OVERRIDE {
+    return base_enumerator_->LastModifiedTime();
+  }
+
+  virtual bool IsDirectory() OVERRIDE {
+    return base_enumerator_->IsDirectory();
+  }
+
+ private:
+  scoped_ptr<FileSystemFileUtil::AbstractFileEnumerator> base_enumerator_;
+  MediaPathFilter* filter_;
+};
+}  // anonymous namespace

[kinuko, 2012/07/28 01:23:35]

nit: please add empty line between line 56 and 57.
nit: 'anonymous namespace' -> just 'namespace' is fine

[tzik, 2012/07/30 23:32:36]

Done.

+
+LocalMediaFileUtil::LocalMediaFileUtil() {
+}
+
+

[kinuko, 2012/07/26 20:21:56]

nit: please remove extra empty line.

[tzik, 2012/07/27 17:18:56]

Done.

+PlatformFileError LocalMediaFileUtil::CreateOrOpen(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    int file_flags,
+    PlatformFile* file_handle,
+    bool* created) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError LocalMediaFileUtil::EnsureFileExists(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url, bool* created) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;

[kinuko, 2012/07/26 20:21:56]

Is this FileUtil also trying to explicitly disable write access??

[tzik, 2012/07/27 17:18:56]

Yes, for now. We need some special handling to support write access under
filtering.
Added comments.

+}
+
+FileSystemFileUtil::AbstractFileEnumerator*
+LocalMediaFileUtil::CreateFileEnumerator(
+    FileSystemOperationContext* context,
+    const FileSystemURL& root_url,
+    bool recursive) {
+  AbstractFileEnumerator* base_enumerator =
+      IsolatedFileUtil::CreateFileEnumerator(context, root_url, recursive);
+  return new FilteringFileEnumerator(
+      scoped_ptr<AbstractFileEnumerator>(base_enumerator),
+      context->media_path_filter());
+}
+
+PlatformFileError LocalMediaFileUtil::Touch(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    const base::Time& last_access_time,
+    const base::Time& last_modified_time) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError LocalMediaFileUtil::Truncate(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    int64 length) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+bool LocalMediaFileUtil::PathExists(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url) {
+  FilePath path;
+  PlatformFileInfo file_info;
+  PlatformFileError error =
+      GetFileInfo(context, url, &file_info, &path);
+  return error == base::PLATFORM_FILE_OK;
+}
+
+bool LocalMediaFileUtil::IsDirectoryEmpty(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url) {
+  DCHECK(context);
+  DCHECK(context->media_path_filter());
+
+  scoped_ptr<AbstractFileEnumerator> enumerator(
+      CreateFileEnumerator(context, url, false));
+  FilePath path;
+  while (!(path = enumerator->Next()).empty()) {
+    if (enumerator->IsDirectory() ||
+        context->media_path_filter()->Match(path))
+      return false;
+  }
+  return true;
+}
+
+PlatformFileError LocalMediaFileUtil::CopyOrMoveFile(
+    FileSystemOperationContext* context,
+    const FileSystemURL& src_url,
+    const FileSystemURL& dest_url,
+    bool copy) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError LocalMediaFileUtil::CopyInForeignFile(
+    FileSystemOperationContext* context,
+    const FilePath& src_file_path,
+    const FileSystemURL& dest_url) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+PlatformFileError LocalMediaFileUtil::DeleteFile(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url) {
+  return base::PLATFORM_FILE_ERROR_SECURITY;
+}
+
+scoped_refptr<webkit_blob::ShareableFileReference>
+LocalMediaFileUtil::CreateSnapshotFile(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    base::PlatformFileError* result,
+    base::PlatformFileInfo* file_info,
+    FilePath* platform_path) {
+  *result = base::PLATFORM_FILE_ERROR_SECURITY;

[kinuko, 2012/07/26 20:21:56]

Why does this just return error?

[tzik, 2012/07/27 17:18:56]

Ah, it's an error. We shouldn't block this. Removed.

+  return NULL;
+}
+
+PlatformFileError LocalMediaFileUtil::GetFileInfo(
+    FileSystemOperationContext* context,
+    const FileSystemURL& url,
+    PlatformFileInfo* file_info,
+    FilePath* platform_path) {
+  base::PlatformFileError error =
+      IsolatedFileUtil::GetFileInfo(context, url, file_info, platform_path);
+  if (error != base::PLATFORM_FILE_OK)
+    return error;
+
+  if (file_info->is_directory ||
+      context->media_path_filter()->Match(*platform_path))
+    return base::PLATFORM_FILE_OK;
+  return base::PLATFORM_FILE_ERROR_NOT_FOUND;
+}
+
+}  // namespace fileapi