selfprivacy.org.app/lib/utils/network_utils.dart

import 'package:selfprivacy/logic/models/json/dns_records.dart';
import 'package:url_launcher/url_launcher.dart';

DnsRecord? extractDkimRecord(final List<DnsRecord> records) {
  DnsRecord? dkimRecord;

  for (final DnsRecord record in records) {
    if (record.type == 'TXT' && record.name == 'selector._domainkey') {
      dkimRecord = record;
    }
  }

  return dkimRecord;
}

String getHostnameFromDomain(final String domain) {
  // Replace all non-alphanumeric characters with an underscore
  String hostname =
      domain.split('.')[0].replaceAll(RegExp(r'[^a-zA-Z0-9]'), '-');
  if (hostname.endsWith('-')) {
    hostname = hostname.substring(0, hostname.length - 1);
  }
  if (hostname.startsWith('-')) {
    hostname = hostname.substring(1);
  }
  if (hostname.isEmpty) {
    hostname = 'selfprivacy-server';
  }

  return hostname;
}

void launchURL(final url) async {
  try {
    final Uri uri = Uri.parse(url);
    await launchUrl(
      uri,
      mode: LaunchMode.externalApplication,
    );
  } catch (e) {
    print(e);
  }
}