// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "media/base/key_system_names.h"

#include <string_view>

#include "base/strings/string_util.h"
#include "media/cdm/clear_key_cdm_common.h"

namespace media {

bool IsClearKey(std::string_view key_system) {
  return key_system == kClearKeyKeySystem;
}

bool IsSubKeySystemOf(std::string_view key_system, std::string_view base) {
  return base::StartsWith(key_system, base) &&
         base::StartsWith(key_system.substr(base.size()), ".");
}

bool IsExternalClearKey(std::string_view key_system) {
  return key_system == kExternalClearKeyKeySystem ||
         IsSubKeySystemOf(key_system, kExternalClearKeyKeySystem);
}

}  // namespace media