phpldapadmin/app/Rules/DNExists.php

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<?php
namespace App\Rules;
use Closure;
use Illuminate\Contracts\Validation\ValidationRule;
use Illuminate\Support\Facades\Crypt;
class DNExists implements ValidationRule
{
/**
* Run the validation rule.
*
* @param \Closure(string, ?string=): \Illuminate\Translation\PotentiallyTranslatedString $fail
*/
public function validate(string $attribute,mixed $value,Closure $fail): void
{
$dn = Crypt::decryptString($value);
// Sometimes our key has a command, so we'll ignore it
if (str_starts_with($dn,'*') && ($x=strpos($dn,'|')))
$dn = substr($dn,$x+1);
if (! config('server')->fetch($dn))
$fail(sprintf('The DN %s doesnt exist.',$dn));
}
}