| // 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()); |
| } |