chrome/browser/media_galleries/media_file_system_registry.h

   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 // MediaFileSystemRegistry registers pictures directories and media devices as
   6 // File API filesystems and keeps track of the path to filesystem ID mappings.
   7
   8 #ifndef CHROME_BROWSER_MEDIA_GALLERIES_MEDIA_FILE_SYSTEM_REGISTRY_H_
   9 #define CHROME_BROWSER_MEDIA_GALLERIES_MEDIA_FILE_SYSTEM_REGISTRY_H_
  10
  11 #include <map>
  12 #include <string>
  13 #include <utility>
  14 #include <vector>
  15
  16 #include "base/basictypes.h"
  17 #include "base/files/file_path.h"
  18 #include "base/memory/ref_counted.h"
  19 #include "base/memory/scoped_ptr.h"
  20 #include "chrome/browser/media_galleries/media_galleries_preferences.h"
  21 #include "chrome/browser/storage_monitor/removable_storage_observer.h"
  22
  23 class ExtensionGalleriesHost;
  24 class MediaFileSystemContext;
  25 class MediaGalleriesPreferences;
  26 class Profile;
  27
  28 namespace content {
  29 class RenderViewHost;
  30 }
  31
  32 namespace extensions {
  33 class Extension;
  34 }
  35
  36 namespace fileapi {
  37 class IsolatedContext;
  38 }
  39
  40 // Contains information about a particular filesystem being provided to a
  41 // client, including metadata like the name and ID, and API handles like the
  42 // fsid (filesystem ID) used to hook up the API objects.
  43 struct MediaFileSystemInfo {
  44   MediaFileSystemInfo(const base::string16& fs_name,
  45                       const base::FilePath& fs_path,
  46                       const std::string& filesystem_id,
  47                       MediaGalleryPrefId pref_id,
  48                       const std::string& transient_device_id,
  49                       bool removable,
  50                       bool media_device);
  51   MediaFileSystemInfo();
  52   ~MediaFileSystemInfo();
  53
  54   base::string16 name;
  55   base::FilePath path;
  56   std::string fsid;
  57   MediaGalleryPrefId pref_id;
  58   std::string transient_device_id;
  59   bool removable;
  60   bool media_device;
  61 };
  62
  63 typedef base::Callback<void(const std::vector<MediaFileSystemInfo>&)>
  64     MediaFileSystemsCallback;
  65
  66 // Tracks usage of filesystems by extensions.
  67 // This object lives on the UI thread.
  68 class MediaFileSystemRegistry
  69     : public RemovableStorageObserver,
  70       public MediaGalleriesPreferences::GalleryChangeObserver {
  71  public:
  72   MediaFileSystemRegistry();
  73   virtual ~MediaFileSystemRegistry();
  74
  75   // Passes to |callback| the list of media filesystem IDs and paths for a
  76   // given RVH.
  77   void GetMediaFileSystemsForExtension(
  78       const content::RenderViewHost* rvh,
  79       const extensions::Extension* extension,
  80       const MediaFileSystemsCallback& callback);
  81
  82   // Returns the media galleries preferences for the specified |profile|.
  83   // Caller is responsible for ensuring that the preferences are initialized
  84   // before use.
  85   MediaGalleriesPreferences* GetPreferences(Profile* profile);
  86
  87   // RemovableStorageObserver implementation.
  88   virtual void OnRemovableStorageDetached(const StorageInfo& info) OVERRIDE;
  89
  90  private:
  91   class MediaFileSystemContextImpl;
  92
  93   friend class MediaFileSystemContextImpl;
  94   friend class MediaFileSystemRegistryTest;
  95   friend class TestMediaFileSystemContext;
  96
  97   // Map an extension to the ExtensionGalleriesHost.
  98   typedef std::map<std::string /*extension_id*/,
  99                    scoped_refptr<ExtensionGalleriesHost> > ExtensionHostMap;
 100   // Map a profile and extension to the ExtensionGalleriesHost.
 101   typedef std::map<Profile*, ExtensionHostMap> ExtensionGalleriesHostMap;
 102
 103   virtual void OnPermissionRemoved(MediaGalleriesPreferences* pref,
 104                                    const std::string& extension_id,
 105                                    MediaGalleryPrefId pref_id) OVERRIDE;
 106   virtual void OnGalleryRemoved(MediaGalleriesPreferences* pref,
 107                                 MediaGalleryPrefId pref_id) OVERRIDE;
 108
 109   void OnExtensionGalleriesHostEmpty(Profile* profile,
 110                                      const std::string& extension_id);
 111
 112   // This map owns all the ExtensionGalleriesHost objects created.
 113   ExtensionGalleriesHostMap extension_hosts_map_;
 114
 115   scoped_ptr<MediaFileSystemContext> file_system_context_;
 116
 117   DISALLOW_COPY_AND_ASSIGN(MediaFileSystemRegistry);
 118 };
 119
 120 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_MEDIA_FILE_SYSTEM_REGISTRY_H_