Viewing file:  IssnValidator.php (1.8 KB) -rw-r--r--
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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;
/**
* Validates whether the value is a valid ISSN.
*
* @author Antonio J. García Lagar <aj@garcialagar.es>
*
* @see https://en.wikipedia.org/wiki/Issn
*/
class IssnValidator 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');
}
// Compose regex pattern
$digitsPattern = $constraint->requireHyphen ? '\d{4}-\d{3}' : '\d{4}-?\d{3}';
$checksumPattern = $constraint->caseSensitive ? '[\d|X]' : '[\d|X|x]';
$pattern = "/^".$digitsPattern.$checksumPattern."$/";
if (!preg_match($pattern, $value)) {
$this->context->addViolation($constraint->message);
} else {
$digits = str_split(strtoupper(str_replace('-', '', $value)));
$sum = 0;
for ($i = 8; $i > 1; $i--) {
$sum += $i * (int) array_shift($digits);
}
$checksum = 'X' == reset($digits) ? 10 : (int) reset($digits);
if (0 != ($sum + $checksum) % 11) {
$this->context->addViolation($constraint->message);
}
}
}
}
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