IdnAddressEncoder.php

<?php
 
/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
 
namespace Symfony\Component\Mime\Encoder;
 
use Symfony\Component\Mime\Exception\AddressEncoderException;
 
final class IdnAddressEncoder implements AddressEncoderInterface
{
    public function encodeString(string $address): string
    {
        $i = strrpos($address, '@');
        if (false !== $i) {
            $local = substr($address, 0, $i);
            $domain = substr($address, $i + 1);
 
            if (preg_match('/[^\x00-\x7F]/', $local)) {
                throw new AddressEncoderException(sprintf('Non-ASCII characters not supported in local-part os "%s".', $address));
            }
 
            if (preg_match('/[^\x00-\x7F]/', $domain)) {
                $address = sprintf('%s@%s', $local, idn_to_ascii($domain, 0, INTL_IDNA_VARIANT_UTS46));
            }
        }
 
        return $address;
    }
}