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<?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\Validator\Constraints;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;
/**
* @author Bernhard Schussek <bschussek@gmail.com>
*
* @api
*/
class EmailValidator extends ConstraintValidator
{
/**
* {@inheritDoc}
*/
public function validate($value, Constraint $constraint)
{
if (null === $value || '' === $value) {
return;
}
if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
throw new UnexpectedTypeException($value, 'string');
}
$value = (string) $value;
$valid = filter_var($value, FILTER_VALIDATE_EMAIL);
if ($valid) {
$host = substr($value, strpos($value, '@') + 1);
if (version_compare(PHP_VERSION, '5.3.3', '<') && strpos($host, '.') === false) {
// Likely not a FQDN, bug in PHP FILTER_VALIDATE_EMAIL prior to PHP 5.3.3
$valid = false;
}
// Check for host DNS resource records
if ($valid && $constraint->checkMX) {
$valid = $this->checkMX($host);
} elseif ($valid && $constraint->checkHost) {
$valid = $this->checkHost($host);
}
}
if (!$valid) {
$this->context->addViolation($constraint->message, array('{{ value }}' => $value));
}
}
/**
* Check DNS Records for MX type.
*
* @param string $host Hostname
*
* @return Boolean
*/
private function checkMX($host)
{
return checkdnsrr($host, 'MX');
}
/**
* Check if one of MX, A or AAAA DNS RR exists.
*
* @param string $host Hostname
*
* @return Boolean
*/
private function checkHost($host)
{
return $this->checkMX($host) || (checkdnsrr($host, "A") || checkdnsrr($host, "AAAA"));
}
}
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