| // Copyright 2013 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef COMPONENTS_MEDIA_DEVICE_SALT_MEDIA_DEVICE_ID_SALT_H_ |
| #define COMPONENTS_MEDIA_DEVICE_SALT_MEDIA_DEVICE_ID_SALT_H_ |
| |
| #include <string> |
| |
| #include "base/memory/ref_counted.h" |
| #include "components/pref_registry/pref_registry_syncable.h" |
| #include "components/prefs/pref_member.h" |
| |
| class PrefService; |
| |
| namespace media_device_salt { |
| |
| namespace prefs { |
| extern const char kMediaDeviceIdSalt[]; |
| } |
| |
| // MediaDeviceIDSalt is responsible for creating and retrieving a salt string |
| // that is used for creating MediaSource IDs that can be cached by a web |
| // service. If the cache is cleared, the MediaSourceIds are invalidated. |
| // |
| // The class is reference counted so that it can be used in the |
| // callback returned by ResourceContext::GetMediaDeviceIDSalt. |
| class MediaDeviceIDSalt : public base::RefCountedThreadSafe<MediaDeviceIDSalt> { |
| public: |
| explicit MediaDeviceIDSalt(PrefService* pref_service); |
| |
| MediaDeviceIDSalt(const MediaDeviceIDSalt&) = delete; |
| MediaDeviceIDSalt& operator=(const MediaDeviceIDSalt&) = delete; |
| |
| static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry); |
| |
| std::string GetSalt() const; |
| static void Reset(PrefService* pref_service); |
| |
| private: |
| friend class base::RefCountedThreadSafe<MediaDeviceIDSalt>; |
| ~MediaDeviceIDSalt(); |
| |
| mutable StringPrefMember media_device_id_salt_; |
| }; |
| |
| } // namespace media_device_salt |
| |
| #endif // COMPONENTS_MEDIA_DEVICE_SALT_MEDIA_DEVICE_ID_SALT_H_ |