src/chrome/browser/media_galleries/fileapi/safe_audio_video_checker.cc

   1 // Copyright 2013 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 "chrome/browser/media_galleries/fileapi/safe_audio_video_checker.h"
   6
   7 #include "base/bind.h"
   8 #include "base/callback.h"
   9 #include "base/location.h"
  10 #include "base/logging.h"
  11 #include "base/process/process_handle.h"
  12 #include "chrome/common/chrome_utility_messages.h"
  13 #include "content/public/browser/child_process_data.h"
  14 #include "content/public/browser/utility_process_host.h"
  15 #include "content/public/browser/browser_thread.h"
  16 #include "ipc/ipc_message_macros.h"
  17 #include "ipc/ipc_platform_file.h"
  18
  19 SafeAudioVideoChecker::SafeAudioVideoChecker(
  20     base::File file,
  21     const fileapi::CopyOrMoveFileValidator::ResultCallback& callback)
  22     : state_(INITIAL_STATE),
  23       file_(file.Pass()),
  24       callback_(callback) {
  25   DCHECK(!callback.is_null());
  26 }
  27
  28 void SafeAudioVideoChecker::Start() {
  29   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
  30   if (state_ != INITIAL_STATE)
  31     return;
  32   state_ = PINGED_STATE;
  33
  34   if (!file_.IsValid()) {
  35     callback_.Run(base::File::FILE_ERROR_SECURITY);
  36     state_ = FINISHED_STATE;
  37     return;
  38   }
  39
  40   utility_process_host_ = content::UtilityProcessHost::Create(
  41       this, base::MessageLoopProxy::current())->AsWeakPtr();
  42   utility_process_host_->Send(new ChromeUtilityMsg_StartupPing);
  43 }
  44
  45 SafeAudioVideoChecker::~SafeAudioVideoChecker() {}
  46
  47 void SafeAudioVideoChecker::OnProcessStarted() {
  48   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
  49   if (state_ != PINGED_STATE)
  50     return;
  51   state_ = STARTED_STATE;
  52
  53   if (utility_process_host_->GetData().handle == base::kNullProcessHandle)
  54     DLOG(ERROR) << "Child process handle is null";
  55   IPC::PlatformFileForTransit file_for_transit =
  56       IPC::TakeFileHandleForProcess(file_.Pass(),
  57                                     utility_process_host_->GetData().handle);
  58   const int64 kFileDecodeTimeInMS = 250;
  59   utility_process_host_->Send(new ChromeUtilityMsg_CheckMediaFile(
  60       kFileDecodeTimeInMS, file_for_transit));
  61 }
  62
  63 void SafeAudioVideoChecker::OnCheckingFinished(bool valid) {
  64   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
  65   if (state_ != STARTED_STATE)
  66     return;
  67   state_ = FINISHED_STATE;
  68
  69   callback_.Run(valid ? base::File::FILE_OK :
  70                         base::File::FILE_ERROR_SECURITY);
  71 }
  72
  73 void SafeAudioVideoChecker::OnProcessCrashed(int exit_code) {
  74   OnCheckingFinished(false);
  75 }
  76
  77 bool SafeAudioVideoChecker::OnMessageReceived(const IPC::Message& message) {
  78   bool handled = true;
  79   IPC_BEGIN_MESSAGE_MAP(SafeAudioVideoChecker, message)
  80     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_ProcessStarted,
  81         OnProcessStarted)
  82     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_CheckMediaFile_Finished,
  83         OnCheckingFinished)
  84     IPC_MESSAGE_UNHANDLED(handled = false)
  85   IPC_END_MESSAGE_MAP()
  86   return handled;
  87 }