<?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,
* or if no suitable IDN encoder is installed.
*/
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, $this->idnToAscii($domain));
}
}
return $address;
}
/**
* IDN-encodes a UTF-8 string to ASCII.
*/
protected function idnToAscii(string $string): string
{
if (function_exists('idn_to_ascii')) {
return idn_to_ascii($string, 0, INTL_IDNA_VARIANT_UTS46);
}
if (class_exists('TrueBV\Punycode')) {
$punycode = new \TrueBV\Punycode();
return $punycode->encode($string);
}
throw new Swift_AddressEncoderException('Non-ASCII characters in address, but no IDN encoder found (install the intl extension or the true/punycode package)', $address);
}
}