// Copyright 2020 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only

import { getOwn } from './getOwn';

const PLATFORM_STRINGS: { [platform: string]: string } = {
  win32: 'Windows',
  darwin: 'macOS',
  linux: 'Linux',
};

export function getUserAgent(appVersion: string): string {
  // `process.platform` could be missing if someone figures out how to compile Signal on
  //   an unsupported OS and forgets to update this file. We'd rather send nothing than
  //   crash.
  const platformString = getOwn(PLATFORM_STRINGS, process.platform);
  const platformStringWithSpace = platformString ? ` ${platformString}` : '';

  return `Signal-Desktop/${appVersion}${platformStringWithSpace}`;
}
