components/media_device_salt/media_device_id_salt.cc

   1 // Copyright 2013 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/media_device_salt/media_device_id_salt.h"
   6
   7 #include "base/base64.h"
   8 #include "base/rand_util.h"
   9 #include "base/system/system_monitor.h"
  10 #include "components/prefs/pref_service.h"
  11 #include "content/public/browser/browser_thread.h"
  12 #include "content/public/browser/media_device_id.h"
  13
  14 using content::BrowserThread;
  15
  16 namespace media_device_salt {
  17
  18 namespace prefs {
  19 const char kMediaDeviceIdSalt[] = "media.device_id_salt";
  20 }
  21
  22 MediaDeviceIDSalt::MediaDeviceIDSalt(PrefService* pref_service) {
  23   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  24
  25   media_device_id_salt_.Init(prefs::kMediaDeviceIdSalt, pref_service);
  26   if (media_device_id_salt_.GetValue().empty()) {
  27     media_device_id_salt_.SetValue(base::UnguessableToken::Create().ToString());
  28   }
  29 }
  30
  31 MediaDeviceIDSalt::~MediaDeviceIDSalt() = default;
  32
  33 std::string MediaDeviceIDSalt::GetSalt() const {
  34   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  35   return media_device_id_salt_.GetValue();
  36 }
  37
  38 void MediaDeviceIDSalt::RegisterProfilePrefs(
  39     user_prefs::PrefRegistrySyncable* registry) {
  40   registry->RegisterStringPref(prefs::kMediaDeviceIdSalt, std::string());
  41 }
  42
  43 void MediaDeviceIDSalt::Reset(PrefService* pref_service) {
  44   pref_service->SetString(prefs::kMediaDeviceIdSalt,
  45                           base::UnguessableToken::Create().ToString());
  46 }
  47
  48 }  // namespace media_device_salt