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| 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 "chrome/browser/system_monitor/media_transfer_protocol_device_observer_
chromeos.h" |
| 6 |
| 7 #include "base/metrics/histogram.h" |
| 8 #include "base/stl_util.h" |
| 9 #include "base/string_number_conversions.h" |
| 10 #include "base/string_split.h" |
| 11 #include "base/system_monitor/system_monitor.h" |
| 12 #include "base/utf_string_conversions.h" |
| 13 #include "chrome/browser/chromeos/mtp/media_transfer_protocol_manager.h" |
| 14 #include "chrome/browser/system_monitor/removable_device_constants.h" |
| 15 #include "chrome/browser/system_monitor/media_storage_util.h" |
| 16 #include "chromeos/dbus/mtp_storage_info.pb.h" |
| 17 |
| 18 namespace chromeos { |
| 19 namespace mtp { |
| 20 |
| 21 using chrome::MediaStorageUtil; |
| 22 |
| 23 namespace { |
| 24 |
| 25 // Device root path constant. |
| 26 const char kRootPath[] = "/"; |
| 27 |
| 28 // Helper function to get device id from storage name. |
| 29 std::string GetDeviceIdFromStorageName(const std::string& storage_name) { |
| 30 std::string unique_id(chrome::kFSUniqueIdPrefix + storage_name); |
| 31 return MediaStorageUtil::MakeDeviceId(MediaStorageUtil::MTP_OR_PTP, |
| 32 unique_id); |
| 33 } |
| 34 |
| 35 // Helper function to get device label from storage information. |
| 36 string16 GetDeviceLabelFromStorageInfo(const MtpStorageInfo& storage_info) { |
| 37 std::string device_label; |
| 38 const std::string& vendor_name = storage_info.vendor(); |
| 39 device_label = vendor_name; |
| 40 |
| 41 const std::string& product_name = storage_info.product(); |
| 42 if (!product_name.empty()) { |
| 43 if (!device_label.empty()) |
| 44 device_label += chrome::kSpaceDelim; |
| 45 device_label += product_name; |
| 46 } |
| 47 return UTF8ToUTF16(device_label); |
| 48 } |
| 49 |
| 50 // Helper function to get the device storage details such as device id, label |
| 51 // and location. On success and fills in |id|, |label| and |location|. |
| 52 void GetStorageInfo(const std::string& storage_name, |
| 53 std::string* id, |
| 54 string16* label, |
| 55 std::string* location) { |
| 56 DCHECK(!storage_name.empty()); |
| 57 MediaTransferProtocolManager* mtp_manager = |
| 58 MediaTransferProtocolManager::GetInstance(); |
| 59 DCHECK(mtp_manager); |
| 60 const MtpStorageInfo* storage_info = |
| 61 mtp_manager->GetStorageInfo(storage_name); |
| 62 |
| 63 if (!storage_info) |
| 64 return; |
| 65 |
| 66 if (id) |
| 67 *id = GetDeviceIdFromStorageName(storage_name); |
| 68 |
| 69 if (label) |
| 70 *label = GetDeviceLabelFromStorageInfo(*storage_info); |
| 71 |
| 72 // Construct a dummy device path using the storage name. This is only used |
| 73 // for registering device media file system. |
| 74 // E.g.: /usb:2,2:12345 |
| 75 if (location) |
| 76 *location = kRootPath + storage_name; |
| 77 } |
| 78 |
| 79 } // namespace |
| 80 |
| 81 MediaTransferProtocolDeviceObserverCros:: |
| 82 MediaTransferProtocolDeviceObserverCros() |
| 83 : get_storage_info_func_(&GetStorageInfo) { |
| 84 MediaTransferProtocolManager* mtp_manager = |
| 85 MediaTransferProtocolManager::GetInstance(); |
| 86 if (mtp_manager) |
| 87 mtp_manager->AddObserver(this); |
| 88 EnumerateStorages(); |
| 89 } |
| 90 |
| 91 // This constructor is only used by unit tests. |
| 92 MediaTransferProtocolDeviceObserverCros:: |
| 93 MediaTransferProtocolDeviceObserverCros( |
| 94 GetStorageInfoFunc get_storage_info_func) |
| 95 : get_storage_info_func_(get_storage_info_func) { |
| 96 // In unit tests, we don't have a media transfer protocol manager. |
| 97 DCHECK(!MediaTransferProtocolManager::GetInstance()); |
| 98 } |
| 99 |
| 100 MediaTransferProtocolDeviceObserverCros:: |
| 101 ~MediaTransferProtocolDeviceObserverCros() { |
| 102 MediaTransferProtocolManager* mtp_manager = |
| 103 MediaTransferProtocolManager::GetInstance(); |
| 104 if (mtp_manager) |
| 105 mtp_manager->RemoveObserver(this); |
| 106 } |
| 107 |
| 108 // MediaTransferProtocolManager::Observer override. |
| 109 void MediaTransferProtocolDeviceObserverCros::StorageChanged( |
| 110 bool is_attached, |
| 111 const std::string& storage_name) { |
| 112 DCHECK(!storage_name.empty()); |
| 113 |
| 114 base::SystemMonitor* system_monitor = base::SystemMonitor::Get(); |
| 115 DCHECK(system_monitor); |
| 116 |
| 117 // New storage is attached. |
| 118 if (is_attached) { |
| 119 std::string device_id; |
| 120 string16 device_name; |
| 121 std::string location; |
| 122 get_storage_info_func_(storage_name, &device_id, &device_name, &location); |
| 123 |
| 124 // Keep track of device id and device name to see how often we receive |
| 125 // empty values. |
| 126 UMA_HISTOGRAM_BOOLEAN("MediaDeviceNotification.MTPDeviceUUIDAvailable", |
| 127 !device_id.empty()); |
| 128 UMA_HISTOGRAM_BOOLEAN("MediaDeviceNotification.MTPDeviceNameAvailable", |
| 129 !device_name.empty()); |
| 130 |
| 131 if (device_id.empty() || device_name.empty()) |
| 132 return; |
| 133 |
| 134 DCHECK(!ContainsKey(storage_map_, storage_name)); |
| 135 storage_map_[storage_name] = device_id; |
| 136 system_monitor->ProcessRemovableStorageAttached(device_id, device_name, |
| 137 location); |
| 138 } else { |
| 139 // Existing storage is detached. |
| 140 StorageNameToIdMap::iterator it = storage_map_.find(storage_name); |
| 141 if (it == storage_map_.end()) |
| 142 return; |
| 143 system_monitor->ProcessRemovableStorageDetached(it->second); |
| 144 storage_map_.erase(it); |
| 145 } |
| 146 } |
| 147 |
| 148 void MediaTransferProtocolDeviceObserverCros::EnumerateStorages() { |
| 149 typedef std::vector<std::string> StorageList; |
| 150 MediaTransferProtocolManager* mtp_manager = |
| 151 MediaTransferProtocolManager::GetInstance(); |
| 152 DCHECK(mtp_manager); |
| 153 StorageList storages = mtp_manager->GetStorages(); |
| 154 for (StorageList::const_iterator storage_iter = storages.begin(); |
| 155 storage_iter != storages.end(); ++storage_iter) { |
| 156 StorageChanged(true, *storage_iter); |
| 157 } |
| 158 } |
| 159 |
| 160 } // namespace mtp |
| 161 } // namespace chromeos |
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