src/content/browser/renderer_host/file_utilities_message_filter.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/renderer_host/file_utilities_message_filter.h"
   6
   7 #include "base/file_util.h"
   8 #include "content/browser/child_process_security_policy_impl.h"
   9 #include "content/common/file_utilities_messages.h"
  10
  11 namespace content {
  12
  13 FileUtilitiesMessageFilter::FileUtilitiesMessageFilter(int process_id)
  14     : process_id_(process_id) {
  15 }
  16
  17 FileUtilitiesMessageFilter::~FileUtilitiesMessageFilter() {
  18 }
  19
  20 void FileUtilitiesMessageFilter::OverrideThreadForMessage(
  21     const IPC::Message& message,
  22     BrowserThread::ID* thread) {
  23   if (IPC_MESSAGE_CLASS(message) == FileUtilitiesMsgStart)
  24     *thread = BrowserThread::FILE;
  25 }
  26
  27 bool FileUtilitiesMessageFilter::OnMessageReceived(const IPC::Message& message,
  28                                                    bool* message_was_ok) {
  29   bool handled = true;
  30   IPC_BEGIN_MESSAGE_MAP_EX(FileUtilitiesMessageFilter, message, *message_was_ok)
  31     IPC_MESSAGE_HANDLER(FileUtilitiesMsg_GetFileInfo, OnGetFileInfo)
  32     IPC_MESSAGE_UNHANDLED(handled = false)
  33   IPC_END_MESSAGE_MAP()
  34   return handled;
  35 }
  36
  37 void FileUtilitiesMessageFilter::OnGetFileInfo(
  38     const base::FilePath& path,
  39     base::PlatformFileInfo* result,
  40     base::PlatformFileError* status) {
  41   *result = base::PlatformFileInfo();
  42   *status = base::PLATFORM_FILE_OK;
  43
  44   // Get file metadata only when the child process has been granted
  45   // permission to read the file.
  46   if (!ChildProcessSecurityPolicyImpl::GetInstance()->CanReadFile(
  47       process_id_, path)) {
  48     return;
  49   }
  50
  51   if (!file_util::GetFileInfo(path, result))
  52     *status = base::PLATFORM_FILE_ERROR_FAILED;
  53 }
  54
  55 }  // namespace content