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

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import 'dart:io';
import 'package:selfprivacy/logic/models/json/dns_records.dart';
import 'package:url_launcher/url_launcher.dart';
enum DnsRecordStatus { ok, waiting, nonexistent }
/// Check if DNS records were recognized.
///
/// Return pairs of full record name matched to its status.
///
/// If no record found, return just one pair of [domain] matched to critical non-existent status.
///
/// - [domain] - full domain delegated to SelfPrivacy (e.g. reimu.love)
/// - [subdomains] - list of all subdomains we want to validate recods of (e.g. api, cloud...)
/// - [ip4] - IP address of our server we want to validate DNS records by (e.g. 127.0.0.1)
Future<Map<String, DnsRecordStatus>> validateDnsMatch(
final String domain,
final List<String> subdomains,
final String ip4,
) async {
final Map<String, DnsRecordStatus> matches = <String, DnsRecordStatus>{};
Future<void> lookup(final String address) async {
await InternetAddress.lookup(address).then(
(final records) {
for (final record in records) {
final bool isIpCorrect = record.address == ip4;
matches[record.host] =
isIpCorrect ? DnsRecordStatus.ok : DnsRecordStatus.waiting;
}
},
);
}
try {
await lookup(domain);
for (final subdomain in subdomains) {
await lookup('$subdomain.$domain');
}
} catch (e) {
print(e);
}
if (matches.isEmpty) {
matches[domain] = DnsRecordStatus.nonexistent;
}
return matches;
}
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);
}
}