content/public/browser/media_device_id.cc

// 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 "content/public/browser/media_device_id.h"

#include "base/strings/string_util.h"
#include "content/browser/browser_main_loop.h"
#include "content/browser/renderer_host/media/media_stream_manager.h"
#include "media/audio/audio_device_description.h"

namespace content {

std::string GetHMACForMediaDeviceID(const std::string& salt,
                                    const url::Origin& security_origin,
                                    const std::string& raw_unique_id) {
  return MediaStreamManager::GetHMACForMediaDeviceID(salt, security_origin,
                                                     raw_unique_id);
}

bool DoesMediaDeviceIDMatchHMAC(const std::string& salt,
                                const url::Origin& security_origin,
                                const std::string& device_guid,
                                const std::string& raw_unique_id) {
  return MediaStreamManager::DoesMediaDeviceIDMatchHMAC(
      salt, security_origin, device_guid, raw_unique_id);
}

bool GetMediaDeviceIDForHMAC(blink::MediaStreamType stream_type,
                             const std::string& salt,
                             const url::Origin& security_origin,
                             const std::string& source_id,
                             std::string* device_id) {
  content::MediaStreamManager* manager =
      content::BrowserMainLoop::GetInstance()->media_stream_manager();

  return manager->TranslateSourceIdToDeviceId(blink::MEDIA_DEVICE_VIDEO_CAPTURE,
                                              salt, security_origin, source_id,
                                              device_id);
}

bool IsValidDeviceId(const std::string& device_id) {
  constexpr int hash_size = 64;  // 32 bytes * 2 char/byte hex encoding
  if (media::AudioDeviceDescription::IsDefaultDevice(device_id) ||
      device_id == media::AudioDeviceDescription::kCommunicationsDeviceId)
    return true;

  if (device_id.length() != hash_size)
    return false;

  return std::all_of(device_id.cbegin(), device_id.cend(), [](const char& c) {
    return base::IsAsciiLower(c) || base::IsAsciiDigit(c);
  });
}

}  // namespace content