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<?php
/*
* This file is part of SwiftMailer.
* (c) 2018 Christian Schmidt
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* An IDN email address encoder.
*
* Encodes the domain part of an address using IDN. This is compatible will all
* SMTP servers.
*
* This encoder does not support email addresses with non-ASCII characters in
* local-part (the substring before @). To send to such addresses, use
* Swift_AddressEncoder_Utf8AddressEncoder together with
* Swift_Transport_Esmtp_SmtpUtf8Handler. Your outbound SMTP server must support
* the SMTPUTF8 extension.
*
* @author Christian Schmidt
*/
class Swift_AddressEncoder_IdnAddressEncoder implements Swift_AddressEncoder
{
/**
* Encodes the domain part of an address using IDN.
*
* @throws Swift_AddressEncoderException If local-part contains non-ASCII characters
*/
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 Swift_AddressEncoderException('Non-ASCII characters not supported in local-part', $address);
}
if (preg_match('/[^\x00-\x7F]/', $domain)) {
$address = sprintf('%s@%s', $local, idn_to_ascii($domain, 0, INTL_IDNA_VARIANT_UTS46));
}
}
return $address;
}
}
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