[fsp] Add support for reading directories.

chrome/browser/chromeos/file_system_provider/operations/read_directory.cc

+// Copyright 2014 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 "chrome/browser/chromeos/file_system_provider/operations/read_directory.h"
+
+#include <string>
+
+#include "base/memory/linked_ptr.h"
+#include "chrome/common/extensions/api/file_system_provider.h"
+#include "chrome/common/extensions/api/file_system_provider_internal.h"
+
+namespace chromeos {
+namespace file_system_provider {
+namespace operations {
+namespace {
+
+// Convert |input| into |output|. If parsing fails, then returns false.
+bool ConvertRequestValueToEntryList(scoped_ptr<RequestValue> value,
+                                    fileapi::AsyncFileUtil::EntryList* output) {
+  using extensions::api::file_system_provider::EntryMetadata;
+  using extensions::api::file_system_provider_internal::
+      ReadDirectoryRequestedSuccess::Params;
+
+  const Params* params = value->read_directory_success_params();
+  if (!params)
+    return false;
+
+  for (size_t i = 0; i < params->entries.size(); ++i) {
+    const linked_ptr<EntryMetadata> entry_metadata = params->entries[i];
+
+    fileapi::DirectoryEntry output_entry;
+    output_entry.is_directory = entry_metadata->is_directory;
+    output_entry.name = entry_metadata->name;
+    output_entry.size = static_cast<int64>(entry_metadata->size);
+
+    std::string input_modification_time;
+    if (!entry_metadata->modification_time.additional_properties.GetString(
+            "value", &input_modification_time)) {
+      return false;
+    }
+    if (!base::Time::FromString(input_modification_time.c_str(),
+                                &output_entry.last_modified_time)) {
+      return false;
+    }
+
+    output->push_back(output_entry);
+  }
+
+  return true;
+}
+
+}  // namespace
+
+ReadDirectory::ReadDirectory(
+    extensions::EventRouter* event_router,
+    const ProvidedFileSystemInfo& file_system_info,
+    const base::FilePath& directory_path,
+    const fileapi::AsyncFileUtil::ReadDirectoryCallback& callback)
+    : Operation(event_router, file_system_info),
+      directory_path_(directory_path),
+      callback_(callback) {
+}
+
+ReadDirectory::~ReadDirectory() {
+}
+
+bool ReadDirectory::Execute(int request_id) {
+  scoped_ptr<base::ListValue> values(new base::ListValue);
+  values->AppendString(directory_path_.AsUTF8Unsafe());
+  return SendEvent(request_id,
+                   extensions::api::file_system_provider::
+                       OnReadDirectoryRequested::kEventName,
+                   values.Pass());
+}
+
+void ReadDirectory::OnSuccess(int /* request_id */,
+                              scoped_ptr<RequestValue> result,
+                              bool has_next) {
+  fileapi::AsyncFileUtil::EntryList entry_list;
+  const bool convert_result =
+      ConvertRequestValueToEntryList(result.Pass(), &entry_list);
+  DCHECK(convert_result);
+  callback_.Run(base::File::FILE_OK, entry_list, has_next);
+}
+
+void ReadDirectory::OnError(int /* request_id */, base::File::Error error) {
+  callback_.Run(
+      error, fileapi::AsyncFileUtil::EntryList(), false /* has_next */);
+}
+
+}  // namespace operations
+}  // namespace file_system_provider
+}  // namespace chromeos