components/storage_monitor/media_storage_util.cc

   1 // Copyright 2014 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 "components/storage_monitor/media_storage_util.h"
   6
   7 #include <vector>
   8
   9 #include "base/callback.h"
  10 #include "base/files/file_util.h"
  11 #include "base/logging.h"
  12 #include "base/metrics/histogram.h"
  13 #include "base/strings/string_util.h"
  14 #include "base/strings/utf_string_conversions.h"
  15 #include "components/storage_monitor/removable_device_constants.h"
  16 #include "components/storage_monitor/storage_monitor.h"
  17 #include "content/public/browser/browser_thread.h"
  18
  19 using content::BrowserThread;
  20
  21 namespace storage_monitor {
  22
  23 namespace {
  24
  25 // MediaDeviceNotification.DeviceInfo histogram values.
  26 enum DeviceInfoHistogramBuckets {
  27   MASS_STORAGE_DEVICE_NAME_AND_UUID_AVAILABLE,
  28   MASS_STORAGE_DEVICE_UUID_MISSING,
  29   MASS_STORAGE_DEVICE_NAME_MISSING,
  30   MASS_STORAGE_DEVICE_NAME_AND_UUID_MISSING,
  31   MTP_STORAGE_DEVICE_NAME_AND_UUID_AVAILABLE,
  32   MTP_STORAGE_DEVICE_UUID_MISSING,
  33   MTP_STORAGE_DEVICE_NAME_MISSING,
  34   MTP_STORAGE_DEVICE_NAME_AND_UUID_MISSING,
  35   DEVICE_INFO_BUCKET_BOUNDARY
  36 };
  37
  38 #if !defined(OS_WIN)
  39 const char kRootPath[] = "/";
  40 #endif
  41
  42 typedef std::vector<StorageInfo> StorageInfoList;
  43
  44 base::FilePath::StringType FindRemovableStorageLocationById(
  45     const std::string& device_id) {
  46   StorageInfoList devices =
  47       StorageMonitor::GetInstance()->GetAllAvailableStorages();
  48   for (StorageInfoList::const_iterator it = devices.begin();
  49        it != devices.end(); ++it) {
  50     if (it->device_id() == device_id
  51         && StorageInfo::IsRemovableDevice(device_id))
  52       return it->location();
  53   }
  54   return base::FilePath::StringType();
  55 }
  56
  57 void FilterAttachedDevicesOnFileThread(MediaStorageUtil::DeviceIdSet* devices) {
  58   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
  59   MediaStorageUtil::DeviceIdSet missing_devices;
  60
  61   for (MediaStorageUtil::DeviceIdSet::const_iterator it = devices->begin();
  62        it != devices->end();
  63        ++it) {
  64     StorageInfo::Type type;
  65     std::string unique_id;
  66     if (!StorageInfo::CrackDeviceId(*it, &type, &unique_id)) {
  67       missing_devices.insert(*it);
  68       continue;
  69     }
  70
  71     if (type == StorageInfo::FIXED_MASS_STORAGE ||
  72         type == StorageInfo::ITUNES ||
  73         type == StorageInfo::IPHOTO ||
  74         type == StorageInfo::PICASA) {
  75       if (!base::PathExists(base::FilePath::FromUTF8Unsafe(unique_id)))
  76         missing_devices.insert(*it);
  77       continue;
  78     }
  79
  80     if (!MediaStorageUtil::IsRemovableStorageAttached(*it))
  81       missing_devices.insert(*it);
  82   }
  83
  84   for (MediaStorageUtil::DeviceIdSet::const_iterator it =
  85            missing_devices.begin();
  86        it != missing_devices.end();
  87        ++it) {
  88     devices->erase(*it);
  89   }
  90 }
  91
  92 }  // namespace
  93
  94 // static
  95 bool MediaStorageUtil::HasDcim(const base::FilePath& mount_point) {
  96   DCHECK(!content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
  97
  98   base::FilePath::StringType dcim_dir(kDCIMDirectoryName);
  99   if (!base::DirectoryExists(mount_point.Append(dcim_dir))) {
 100     // Check for lowercase 'dcim' as well.
 101     base::FilePath dcim_path_lower(
 102         mount_point.Append(base::StringToLowerASCII(dcim_dir)));
 103     if (!base::DirectoryExists(dcim_path_lower))
 104       return false;
 105   }
 106   return true;
 107 }
 108
 109 // static
 110 bool MediaStorageUtil::CanCreateFileSystem(const std::string& device_id,
 111                                            const base::FilePath& path) {
 112   StorageInfo::Type type;
 113   if (!StorageInfo::CrackDeviceId(device_id, &type, NULL))
 114     return false;
 115
 116   if (type == StorageInfo::MAC_IMAGE_CAPTURE)
 117     return true;
 118
 119   return !path.empty() && path.IsAbsolute() && !path.ReferencesParent();
 120 }
 121
 122 // static
 123 void MediaStorageUtil::FilterAttachedDevices(DeviceIdSet* devices,
 124                                              const base::Closure& done) {
 125   if (BrowserThread::CurrentlyOn(BrowserThread::FILE)) {
 126     FilterAttachedDevicesOnFileThread(devices);
 127     done.Run();
 128     return;
 129   }
 130   BrowserThread::PostTaskAndReply(BrowserThread::FILE,
 131                                   FROM_HERE,
 132                                   base::Bind(&FilterAttachedDevicesOnFileThread,
 133                                              devices),
 134                                   done);
 135 }
 136
 137 // TODO(kmadhusu) Write unit tests for GetDeviceInfoFromPath().
 138 bool MediaStorageUtil::GetDeviceInfoFromPath(const base::FilePath& path,
 139                                              StorageInfo* device_info,
 140                                              base::FilePath* relative_path) {
 141   DCHECK(device_info);
 142   DCHECK(relative_path);
 143
 144   if (!path.IsAbsolute())
 145     return false;
 146
 147   StorageInfo info;
 148   StorageMonitor* monitor = StorageMonitor::GetInstance();
 149   bool found_device = monitor->GetStorageInfoForPath(path, &info);
 150
 151   if (found_device && StorageInfo::IsRemovableDevice(info.device_id())) {
 152     base::FilePath sub_folder_path;
 153     base::FilePath device_path(info.location());
 154     if (path != device_path) {
 155       bool success = device_path.AppendRelativePath(path, &sub_folder_path);
 156       DCHECK(success);
 157     }
 158
 159     *device_info = info;
 160     *relative_path = sub_folder_path;
 161     return true;
 162   }
 163
 164   // On Posix systems, there's one root so any absolute path could be valid.
 165   // TODO(gbillock): Delete this stanza? Posix systems should have the root
 166   // volume information. If not, we should move the below into the
 167   // right GetStorageInfoForPath implementations.
 168 #if !defined(OS_POSIX)
 169   if (!found_device)
 170     return false;
 171 #endif
 172
 173   // Handle non-removable devices. Note: this is just overwriting
 174   // good values from StorageMonitor.
 175   // TODO(gbillock): Make sure return values from that class are definitive,
 176   // and don't do this here.
 177   info.set_device_id(
 178       StorageInfo::MakeDeviceId(StorageInfo::FIXED_MASS_STORAGE,
 179                                 path.AsUTF8Unsafe()));
 180   *device_info = info;
 181   *relative_path = base::FilePath();
 182   return true;
 183 }
 184
 185 // static
 186 base::FilePath MediaStorageUtil::FindDevicePathById(
 187     const std::string& device_id) {
 188   StorageInfo::Type type;
 189   std::string unique_id;
 190   if (!StorageInfo::CrackDeviceId(device_id, &type, &unique_id))
 191     return base::FilePath();
 192
 193   if (type == StorageInfo::FIXED_MASS_STORAGE ||
 194       type == StorageInfo::ITUNES ||
 195       type == StorageInfo::IPHOTO ||
 196       type == StorageInfo::PICASA) {
 197     // For this type, the unique_id is the path.
 198     return base::FilePath::FromUTF8Unsafe(unique_id);
 199   }
 200
 201   // For ImageCapture, the synthetic filesystem will be rooted at a fake
 202   // top-level directory which is the device_id.
 203   if (type == StorageInfo::MAC_IMAGE_CAPTURE) {
 204 #if !defined(OS_WIN)
 205     return base::FilePath(kRootPath + device_id);
 206 #endif
 207   }
 208
 209   DCHECK(type == StorageInfo::MTP_OR_PTP ||
 210          type == StorageInfo::REMOVABLE_MASS_STORAGE_WITH_DCIM ||
 211          type == StorageInfo::REMOVABLE_MASS_STORAGE_NO_DCIM);
 212   return base::FilePath(FindRemovableStorageLocationById(device_id));
 213 }
 214
 215 // static
 216 void MediaStorageUtil::RecordDeviceInfoHistogram(
 217     bool mass_storage,
 218     const std::string& device_uuid,
 219     const base::string16& device_label) {
 220   unsigned int event_number = 0;
 221   if (!mass_storage)
 222     event_number = 4;
 223
 224   if (device_label.empty())
 225     event_number += 2;
 226
 227   if (device_uuid.empty())
 228     event_number += 1;
 229   enum DeviceInfoHistogramBuckets event =
 230       static_cast<enum DeviceInfoHistogramBuckets>(event_number);
 231   if (event >= DEVICE_INFO_BUCKET_BOUNDARY) {
 232     NOTREACHED();
 233     return;
 234   }
 235   UMA_HISTOGRAM_ENUMERATION("MediaDeviceNotifications.DeviceInfo", event,
 236                             DEVICE_INFO_BUCKET_BOUNDARY);
 237 }
 238
 239 bool MediaStorageUtil::IsRemovableStorageAttached(const std::string& id) {
 240   StorageInfoList devices =
 241       StorageMonitor::GetInstance()->GetAllAvailableStorages();
 242   for (StorageInfoList::const_iterator it = devices.begin();
 243        it != devices.end(); ++it) {
 244     if (StorageInfo::IsRemovableDevice(id) && it->device_id() == id)
 245       return true;
 246   }
 247   return false;
 248 }
 249
 250 }  // namespace storage_monitor