parseUA.ts

export function parseUA(ua: string) {
  const parsed = {
    device: 'pc',
    deviceModel: 'unknown',
    os: 'unknown',
    osVersion: 'unknown',
  };
  const [, , info] = ua.match(/^(Mozilla|Dalvik)\/[\d.-_]+ \(([^()]+)\)/) || [];
  const ios = info.match(/(iPad|iPhone|iPod).+?OS\s+([\d._-]+)/i);
  if (ios) {
    parsed.device = ios[1];
    parsed.deviceModel = ios[1];
    parsed.os = 'iOS';
    parsed.osVersion = ios[2];
    return parsed;
  }

  const mac = info.match(/Mac\s+OS.+?([\d._-]+)/i);
  if (mac) {
    parsed.os = 'macOS';
    parsed.osVersion = mac[1];
    parsed.device = 'Macintosh';
    parsed.deviceModel = 'Macintosh';
    return parsed;
  }

  const windows = info.match(/Windows\s+NT\s+([\d._-]+)/i);
  if (windows) {
    parsed.os = 'Windows';
    parsed.osVersion = windows[1];
  }

  const elems = info ? info.split(';') : [];
  for (let i = 0; i < elems.length; i++) {
    const str = elems[i].trim();
    const device = str.match(/(.+?)\s+Build\//i);
    if (device && device[1]) {
      const [d] = device[1].split(' ');
      parsed.device = d;
      parsed.deviceModel = device[1];
    }
    const android = str.match(/Android\s+([\d._-]+)/i);
    if (android) {
      parsed.os = 'Android';
      parsed.osVersion = android[1];
    }
    if (parsed.os !== 'unknown' && str.match(/Linux/i)) {
      parsed.os = 'Linux';
    }
  }
  return parsed;
}