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.
5 #ifndef CHROME_BROWSER_MEDIA_MEDIA_DEVICE_ID_SALT_H_
6 #define CHROME_BROWSER_MEDIA_MEDIA_DEVICE_ID_SALT_H_
10 #include "base/memory/ref_counted.h"
11 #include "base/prefs/pref_member.h"
12 #include "components/user_prefs/pref_registry_syncable.h"
16 // MediaDeviceIDSalt is responsible for creating and retrieving a salt string
17 // that is used for creating MediaSource IDs that can be cached by a web
18 // service. If the cache is cleared, the MediaSourceIds are invalidated.
20 // The class is reference counted so that it can be used in the
21 // callback returned by ResourceContext::GetMediaDeviceIDSalt.
22 class MediaDeviceIDSalt : public base::RefCountedThreadSafe<MediaDeviceIDSalt> {
24 MediaDeviceIDSalt(PrefService* pref_service, bool incognito);
25 void ShutdownOnUIThread();
27 std::string GetSalt() const;
29 static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
30 static void Reset(PrefService* pref_service);
33 friend class base::RefCountedThreadSafe<MediaDeviceIDSalt>;
36 // |incognito_salt_| is initialized in ctor on UI thread but only read
38 std::string incognito_salt_;
39 mutable StringPrefMember media_device_id_salt_;
41 DISALLOW_COPY_AND_ASSIGN(MediaDeviceIDSalt);
44 #endif // CHROME_BROWSER_MEDIA_MEDIA_DEVICE_ID_SALT_H_