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 "chrome/common/extensions/chrome_utility_extensions_messages.h"
  14 #include "content/public/browser/child_process_data.h"
  15 #include "content/public/browser/utility_process_host.h"
  16 #include "content/public/browser/browser_thread.h"
  17 #include "ipc/ipc_message_macros.h"
  18 #include "ipc/ipc_platform_file.h"
  19
  20 SafeAudioVideoChecker::SafeAudioVideoChecker(
  21     base::File file,
  22     const storage::CopyOrMoveFileValidator::ResultCallback& callback)
  23     : state_(INITIAL_STATE), file_(file.Pass()), callback_(callback) {
  24   DCHECK(!callback.is_null());
  25 }
  26
  27 void SafeAudioVideoChecker::Start() {
  28   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
  29   if (state_ != INITIAL_STATE)
  30     return;
  31   state_ = PINGED_STATE;
  32
  33   if (!file_.IsValid()) {
  34     callback_.Run(base::File::FILE_ERROR_SECURITY);
  35     state_ = FINISHED_STATE;
  36     return;
  37   }
  38
  39   utility_process_host_ = content::UtilityProcessHost::Create(
  40       this, base::MessageLoopProxy::current())->AsWeakPtr();
  41   utility_process_host_->Send(new ChromeUtilityMsg_StartupPing);
  42 }
  43
  44 SafeAudioVideoChecker::~SafeAudioVideoChecker() {}
  45
  46 void SafeAudioVideoChecker::OnProcessStarted() {
  47   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
  48   if (state_ != PINGED_STATE)
  49     return;
  50   state_ = STARTED_STATE;
  51
  52   if (utility_process_host_->GetData().handle == base::kNullProcessHandle)
  53     DLOG(ERROR) << "Child process handle is null";
  54   IPC::PlatformFileForTransit file_for_transit =
  55       IPC::TakeFileHandleForProcess(file_.Pass(),
  56                                     utility_process_host_->GetData().handle);
  57   if (file_for_transit == IPC::InvalidPlatformFileForTransit()) {
  58     OnCheckingFinished(false /* valid? */);
  59     return;
  60   }
  61   const int64 kFileDecodeTimeInMS = 250;
  62   utility_process_host_->Send(new ChromeUtilityMsg_CheckMediaFile(
  63       kFileDecodeTimeInMS, file_for_transit));
  64 }
  65
  66 void SafeAudioVideoChecker::OnCheckingFinished(bool valid) {
  67   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
  68   if (state_ != STARTED_STATE)
  69     return;
  70   state_ = FINISHED_STATE;
  71
  72   callback_.Run(valid ? base::File::FILE_OK :
  73                         base::File::FILE_ERROR_SECURITY);
  74 }
  75
  76 void SafeAudioVideoChecker::OnProcessCrashed(int exit_code) {
  77   OnCheckingFinished(false);
  78 }
  79
  80 bool SafeAudioVideoChecker::OnMessageReceived(const IPC::Message& message) {
  81   bool handled = true;
  82   IPC_BEGIN_MESSAGE_MAP(SafeAudioVideoChecker, message)
  83     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_ProcessStarted,
  84         OnProcessStarted)
  85     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_CheckMediaFile_Finished,
  86         OnCheckingFinished)
  87     IPC_MESSAGE_UNHANDLED(handled = false)
  88   IPC_END_MESSAGE_MAP()
  89   return handled;
  90 }