Implement IsNonNativeLocalPathDirectory for supporting non-local non-Drive directory access in apps.

chrome/browser/chromeos/file_manager/fileapi_util.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 "chrome/browser/chromeos/file_manager/fileapi_util.h"
 
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
+#include "chrome/browser/chromeos/file_manager/app_id.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/browser/storage_partition.h"
 #include "extensions/common/extension.h"
+#include "google_apis/drive/task_util.h"
 #include "net/base/escape.h"
 #include "url/gurl.h"
 #include "webkit/browser/fileapi/file_system_context.h"
 #include "webkit/browser/fileapi/open_file_system_mode.h"
 #include "webkit/common/fileapi/file_system_util.h"
 
 using content::BrowserThread;
 
 namespace file_manager {
 namespace util {
@@ skipping 177 matching lines @@
 
 // Helper function to return the converted definition entry directly, without
 // the redundant container.
 void OnConvertFileDefinitionDone(
     const EntryDefinitionCallback& callback,
     scoped_ptr<EntryDefinitionList> entry_definition_list) {
   DCHECK_EQ(1u, entry_definition_list->size());
   callback.Run(entry_definition_list->at(0));
 }
 
+// Used to implement CheckIfDirectoryExists().
+void CheckIfDirectoryExistsOnIOThread(
+    scoped_refptr<fileapi::FileSystemContext> file_system_context,
+    const GURL& url,
+    const fileapi::FileSystemOperationRunner::StatusCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  fileapi::FileSystemURL file_system_url = file_system_context->CrackURL(url);
+  file_system_context->operation_runner()->DirectoryExists(
+      file_system_url, callback);
+}
+
 }  // namespace
 
 EntryDefinition::EntryDefinition() {
 }
 
 EntryDefinition::~EntryDefinition() {
 }
 
 fileapi::FileSystemContext* GetFileSystemContextForExtensionId(
     Profile* profile,
@@ skipping 97 matching lines @@
 
   FileDefinitionList file_definition_list;
   file_definition_list.push_back(file_definition);
   ConvertFileDefinitionListToEntryDefinitionList(
       profile,
       extension_id,
       file_definition_list,
       base::Bind(&OnConvertFileDefinitionDone, callback));
 }
 
+void CheckIfDirectoryExists(
+    scoped_refptr<fileapi::FileSystemContext> file_system_context,
+    const GURL& url,
+    const fileapi::FileSystemOperationRunner::StatusCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  // Check the existence of directory using file system API implementation on
+  // behalf of the file manager app. We need to grant access beforehand.
+  fileapi::ExternalFileSystemBackend* backend =
+      file_system_context->external_backend();
+  DCHECK(backend);
+  backend->GrantFullAccessToExtension(kFileManagerAppId);
+
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&CheckIfDirectoryExistsOnIOThread,
+                 file_system_context,
+                 url,
+                 google_apis::CreateRelayCallback(callback)));
+}
+
 }  // namespace util
 }  // namespace file_manager