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// 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_
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