components/storage_monitor/portable_device_watcher_win.h

   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 #ifndef COMPONENTS_STORAGE_MONITOR_PORTABLE_DEVICE_WATCHER_WIN_H_
   6 #define COMPONENTS_STORAGE_MONITOR_PORTABLE_DEVICE_WATCHER_WIN_H_
   7
   8 #include <portabledeviceapi.h>
   9
  10 #include <map>
  11 #include <string>
  12 #include <vector>
  13
  14 #include "base/memory/ref_counted.h"
  15 #include "base/memory/weak_ptr.h"
  16 #include "base/strings/string16.h"
  17 #include "components/storage_monitor/storage_monitor.h"
  18
  19 namespace base {
  20 class SequencedTaskRunner;
  21 }
  22
  23 namespace storage_monitor {
  24
  25 class TestPortableDeviceWatcherWin;
  26
  27 // This class watches the portable device mount points and sends notifications
  28 // about the attached/detached media transfer protocol (MTP) devices.
  29 // This is a singleton class instantiated by StorageMonitorWin. This class is
  30 // created, destroyed and operates on the UI thread, except for long running
  31 // tasks it spins off to a SequencedTaskRunner.
  32 class PortableDeviceWatcherWin {
  33  public:
  34   typedef std::vector<base::string16> StorageObjectIDs;
  35
  36   struct DeviceStorageObject {
  37     DeviceStorageObject(const base::string16& temporary_id,
  38                         const std::string& persistent_id);
  39
  40     // Storage object temporary identifier, e.g. "s10001". This string ID
  41     // uniquely identifies the object on the device. This ID need not be
  42     // persistent across sessions. This ID is obtained from WPD_OBJECT_ID
  43     // property.
  44     base::string16 object_temporary_id;
  45
  46     // Storage object persistent identifier,
  47     // e.g. "StorageSerial:<SID-{10001,D,31080448}>:<123456789>".
  48     std::string object_persistent_id;
  49   };
  50   typedef std::vector<DeviceStorageObject> StorageObjects;
  51
  52   // Struct to store attached MTP device details.
  53   struct DeviceDetails {
  54     // Device name.
  55     base::string16 name;
  56
  57     // Device interface path.
  58     base::string16 location;
  59
  60     // Device storage details. A device can have multiple data partitions.
  61     StorageObjects storage_objects;
  62   };
  63   typedef std::vector<DeviceDetails> Devices;
  64
  65   // TODO(gbillock): Change to take the device notifications object as
  66   // an argument.
  67   PortableDeviceWatcherWin();
  68   virtual ~PortableDeviceWatcherWin();
  69
  70   // Must be called after the browser blocking pool is ready for use.
  71   // StorageMonitorWin::Init() will call this function.
  72   void Init(HWND hwnd);
  73
  74   // Processes DEV_BROADCAST_DEVICEINTERFACE messages and triggers a
  75   // notification if appropriate.
  76   void OnWindowMessage(UINT event_type, LPARAM data);
  77
  78   // Gets the information of the MTP storage specified by |storage_device_id|.
  79   // On success, returns true and fills in |device_location| with device
  80   // interface details and |storage_object_id| with storage object temporary
  81   // identifier.
  82   virtual bool GetMTPStorageInfoFromDeviceId(
  83       const std::string& storage_device_id,
  84       base::string16* device_location,
  85       base::string16* storage_object_id) const;
  86
  87   // Constructs and returns a storage path from storage unique identifier.
  88   static base::string16 GetStoragePathFromStorageId(
  89       const std::string& storage_unique_id);
  90
  91   // Set the volume notifications object to be used when new
  92   // devices are found.
  93   void SetNotifications(StorageMonitor::Receiver* notifications);
  94
  95   void EjectDevice(const std::string& device_id,
  96                    base::Callback<void(StorageMonitor::EjectStatus)> callback);
  97
  98  private:
  99   friend class TestPortableDeviceWatcherWin;
 100
 101   // Key: MTP device storage unique id.
 102   // Value: Metadata for the given storage.
 103   typedef std::map<std::string, StorageInfo> MTPStorageMap;
 104
 105   // Key: MTP device plug and play ID string.
 106   // Value: Vector of device storage objects.
 107   typedef std::map<base::string16, StorageObjects> MTPDeviceMap;
 108
 109   // Helpers to enumerate existing MTP storage devices.
 110   virtual void EnumerateAttachedDevices();
 111   void OnDidEnumerateAttachedDevices(const Devices* devices,
 112                                      const bool result);
 113
 114   // Helpers to handle device attach event.
 115   virtual void HandleDeviceAttachEvent(const base::string16& pnp_device_id);
 116   void OnDidHandleDeviceAttachEvent(const DeviceDetails* device_details,
 117                                     const bool result);
 118
 119   // Handles the detach event of the device specified by |pnp_device_id|.
 120   void HandleDeviceDetachEvent(const base::string16& pnp_device_id);
 121
 122   // The portable device notifications handle.
 123   HDEVNOTIFY notifications_;
 124
 125   // Attached media transfer protocol device map.
 126   MTPDeviceMap device_map_;
 127
 128   // Attached media transfer protocol device storage objects map.
 129   MTPStorageMap storage_map_;
 130
 131   // The task runner used to execute tasks that may take a long time and thus
 132   // should not be performed on the UI thread.
 133   scoped_refptr<base::SequencedTaskRunner> media_task_runner_;
 134
 135   // The notifications object to use to signal newly attached devices.
 136   StorageMonitor::Receiver* storage_notifications_;
 137
 138   // Used by |media_task_runner_| to create cancelable callbacks.
 139   base::WeakPtrFactory<PortableDeviceWatcherWin> weak_ptr_factory_;
 140
 141   DISALLOW_COPY_AND_ASSIGN(PortableDeviceWatcherWin);
 142 };
 143
 144 }  // namespace storage_monitor
 145
 146 #endif  // COMPONENTS_STORAGE_MONITOR_PORTABLE_DEVICE_WATCHER_WIN_H_