chrome/browser/media_galleries/fileapi/supported_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/supported_audio_video_checker.h"
   6
   7 #include <set>
   8 #include <vector>
   9
  10 #include "base/bind.h"
  11 #include "base/callback.h"
  12 #include "base/lazy_instance.h"
  13 #include "base/location.h"
  14 #include "base/logging.h"
  15 #include "base/stl_util.h"
  16 #include "chrome/browser/media_galleries/fileapi/safe_audio_video_checker.h"
  17 #include "components/mime_util/mime_util.h"
  18 #include "content/public/browser/browser_thread.h"
  19 #include "net/base/mime_util.h"
  20
  21 namespace {
  22
  23 class SupportedAudioVideoExtensions {
  24  public:
  25   SupportedAudioVideoExtensions() {
  26     std::vector<base::FilePath::StringType> extensions;
  27     net::GetExtensionsForMimeType("audio/*", &extensions);
  28     net::GetExtensionsForMimeType("video/*", &extensions);
  29     for (size_t i = 0; i < extensions.size(); ++i) {
  30       std::string mime_type;
  31       if (net::GetWellKnownMimeTypeFromExtension(extensions[i], &mime_type) &&
  32           mime_util::IsSupportedMimeType(mime_type)) {
  33         audio_video_extensions_.insert(
  34             base::FilePath::kExtensionSeparator + extensions[i]);
  35       }
  36     }
  37   };
  38
  39   bool HasSupportedAudioVideoExtension(const base::FilePath& file) {
  40     return ContainsKey(audio_video_extensions_, file.Extension());
  41   }
  42
  43  private:
  44   std::set<base::FilePath::StringType> audio_video_extensions_;
  45
  46   DISALLOW_COPY_AND_ASSIGN(SupportedAudioVideoExtensions);
  47 };
  48
  49 base::LazyInstance<SupportedAudioVideoExtensions> g_audio_video_extensions =
  50     LAZY_INSTANCE_INITIALIZER;
  51
  52 base::File OpenOnFileThread(const base::FilePath& path) {
  53   DCHECK_CURRENTLY_ON(content::BrowserThread::FILE);
  54   return base::File(path, base::File::FLAG_OPEN | base::File::FLAG_READ);
  55 }
  56
  57 }  // namespace
  58
  59 SupportedAudioVideoChecker::~SupportedAudioVideoChecker() {}
  60
  61 // static
  62 bool SupportedAudioVideoChecker::SupportsFileType(const base::FilePath& path) {
  63   return g_audio_video_extensions.Get().HasSupportedAudioVideoExtension(path);
  64 }
  65
  66 void SupportedAudioVideoChecker::StartPreWriteValidation(
  67     const storage::CopyOrMoveFileValidator::ResultCallback& result_callback) {
  68   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
  69   DCHECK(callback_.is_null());
  70   callback_ = result_callback;
  71
  72   content::BrowserThread::PostTaskAndReplyWithResult(
  73       content::BrowserThread::FILE,
  74       FROM_HERE,
  75       base::Bind(&OpenOnFileThread, path_),
  76       base::Bind(&SupportedAudioVideoChecker::OnFileOpen,
  77                  weak_factory_.GetWeakPtr()));
  78 }
  79
  80 SupportedAudioVideoChecker::SupportedAudioVideoChecker(
  81     const base::FilePath& path)
  82     : path_(path),
  83       weak_factory_(this) {
  84 }
  85
  86 void SupportedAudioVideoChecker::OnFileOpen(base::File file) {
  87   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
  88   if (!file.IsValid()) {
  89     callback_.Run(base::File::FILE_ERROR_SECURITY);
  90     return;
  91   }
  92
  93   safe_checker_ = new SafeAudioVideoChecker(file.Pass(), callback_);
  94   safe_checker_->Start();
  95 }