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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_MEDIA_MEDIA_DEVICE_ID_SALT_H_
#define CHROME_BROWSER_MEDIA_MEDIA_DEVICE_ID_SALT_H_
#include <string>
#include "base/memory/ref_counted.h"
#include "base/prefs/pref_member.h"
#include "components/pref_registry/pref_registry_syncable.h"
class PrefService;
// 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:
MediaDeviceIDSalt(PrefService* pref_service, bool incognito);
void ShutdownOnUIThread();
std::string GetSalt() const;
static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
static void Reset(PrefService* pref_service);
private:
friend class base::RefCountedThreadSafe<MediaDeviceIDSalt>;
~MediaDeviceIDSalt();
// |incognito_salt_| is initialized in ctor on UI thread but only read
// on the IO thread.
std::string incognito_salt_;
mutable StringPrefMember media_device_id_salt_;
DISALLOW_COPY_AND_ASSIGN(MediaDeviceIDSalt);
};
#endif // CHROME_BROWSER_MEDIA_MEDIA_DEVICE_ID_SALT_H_
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