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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.
#include "chrome/browser/media/media_device_id_salt.h"
#include "base/base64.h"
#include "base/prefs/pref_service.h"
#include "base/rand_util.h"
#include "chrome/browser/profiles/profile_io_data.h"
#include "chrome/common/pref_names.h"
#include "content/public/browser/browser_thread.h"
using content::BrowserThread;
namespace {
std::string CreateSalt() {
std::string salt;
base::Base64Encode(base::RandBytesAsString(16), &salt);
DCHECK(!salt.empty());
return salt;
}
} // namespace
MediaDeviceIDSalt::MediaDeviceIDSalt(PrefService* pref_service,
bool incognito) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (incognito) {
incognito_salt_ = CreateSalt();
return;
}
media_device_id_salt_.Init(prefs::kMediaDeviceIdSalt, pref_service);
if (media_device_id_salt_.GetValue().empty())
media_device_id_salt_.SetValue(CreateSalt());
media_device_id_salt_.MoveToThread(
BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
}
MediaDeviceIDSalt::~MediaDeviceIDSalt() {
}
void MediaDeviceIDSalt::ShutdownOnUIThread() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (incognito_salt_.empty())
media_device_id_salt_.Destroy();
}
std::string MediaDeviceIDSalt::GetSalt() const {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
if (incognito_salt_.size())
return incognito_salt_;
return media_device_id_salt_.GetValue();
}
void MediaDeviceIDSalt::RegisterProfilePrefs(
user_prefs::PrefRegistrySyncable* registry) {
registry->RegisterStringPref(
prefs::kMediaDeviceIdSalt,
std::string(),
user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
}
void MediaDeviceIDSalt::Reset(PrefService* pref_service) {
pref_service->SetString(prefs::kMediaDeviceIdSalt,
CreateSalt());
}
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