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<?php
namespace Egulias\EmailValidator\Validation;
use Egulias\EmailValidator\EmailLexer;
use Egulias\EmailValidator\Exception\InvalidEmail;
use Egulias\EmailValidator\Warning\NoDNSMXRecord;
use Egulias\EmailValidator\Exception\NoDNSRecord;
class DNSCheckValidation implements EmailValidation
{
/**
* @var array
*/
private $warnings = [];
/**
* @var InvalidEmail|null
*/
private $error;
public function __construct()
{
if (!function_exists('idn_to_ascii')) {
throw new \LogicException(sprintf('The %s class requires the Intl extension.', __CLASS__));
}
}
public function isValid($email, EmailLexer $emailLexer)
{
// use the input to check DNS if we cannot extract something similar to a domain
$host = $email;
// Arguable pattern to extract the domain. Not aiming to validate the domain nor the email
if (false !== $lastAtPos = strrpos($email, '@')) {
$host = substr($email, $lastAtPos + 1);
}
return $this->checkDNS($host);
}
public function getError()
{
return $this->error;
}
public function getWarnings()
{
return $this->warnings;
}
/**
* @param string $host
*
* @return bool
*/
protected function checkDNS($host)
{
$variant = INTL_IDNA_VARIANT_2003;
if ( defined('INTL_IDNA_VARIANT_UTS46') ) {
$variant = INTL_IDNA_VARIANT_UTS46;
}
$host = rtrim(idn_to_ascii($host, IDNA_DEFAULT, $variant), '.') . '.';
$Aresult = true;
$MXresult = checkdnsrr($host, 'MX');
if (!$MXresult) {
$this->warnings[NoDNSMXRecord::CODE] = new NoDNSMXRecord();
$Aresult = checkdnsrr($host, 'A') || checkdnsrr($host, 'AAAA');
if (!$Aresult) {
$this->error = new NoDNSRecord();
}
}
return $MXresult || $Aresult;
}
}