<?php
declare(strict_types=1);
namespace ParagonIE\Ionizer\Filter\Special;
use ParagonIE\Ionizer\Filter\StringFilter;
use ParagonIE\Ionizer\InvalidDataException;
/**
* Class EmailAddressFilter
* @package ParagonIE\Ionizer\Filter\Special
*/
class EmailAddressFilter extends StringFilter
{
/**
* @var bool $checkDNS
*/
protected $checkDNS = true;
public function __construct()
{
$this->addThisCallback('validateEmailAddress');
}
/**
* @param bool $value
*
* @return self
*/
public function setCheckDNS(bool $value): self
{
$this->checkDNS = $value;
return $this;
}
/**
* @param string $input
*
* @return string
* @throws InvalidDataException
*/
public function validateEmailAddress(string $input): string
{
/** @var string|bool $filtered */
$filtered = \filter_var($input, FILTER_VALIDATE_EMAIL);
if (!\is_string($filtered)) {
throw new InvalidDataException('Invalid email address: ' . $input);
}
$pos = \strpos($filtered, '@');
if ($pos === false) {
throw new InvalidDataException('Invalid email address (no @): ' . $input);
}
if (\substr_count($filtered, '@') !== 1) {
throw new InvalidDataException('Invalid email address (more than one @): ' . $input);
}
if ($pos === 0) {
throw new InvalidDataException('Invalid email address (no username): ' . $input);
}
/**
* @var string $username
* @var string $domain
*/
list ($username, $domain) = \explode('@', $filtered);
if (\preg_match('#^\.#', $username) || \preg_match('#\.$#', $username)) {
throw new InvalidDataException('Invalid email address (leading or trailing dot): ' . $input);
}
if (\strpos($filtered, '..') !== false) {
throw new InvalidDataException('Invalid email address (consecutive dots): ' . $input);
}
if ($this->checkDNS) {
if (!\preg_match('#^\[?' . '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' . '\]?$#', $domain)) {
if (!\checkdnsrr($domain, 'MX')) {
throw new InvalidDataException('Invalid email address (no MX record on domain): ' . $input);
}
}
}
return $filtered;
}
}
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