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pixelfed/app/Services/DomainService.php

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PHP
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<?php
namespace App\Services;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Redis;
class DomainService
{
const CACHE_KEY = 'pf:services:domains:';
public static function hasValidDns($domain)
{
if(!$domain || !strlen($domain) || strpos($domain, '.') == -1) {
return false;
}
if(config('security.url.trusted_domains')) {
if(in_array($domain, explode(',', config('security.url.trusted_domains')))) {
return true;
}
}
return Cache::remember(self::CACHE_KEY . 'valid-dns:' . $domain, 14400, function() use($domain) {
return count(dns_get_record($domain, DNS_A | DNS_AAAA)) > 0;
});
}
}