/usr/share/php/Symfony/Component/Validator/Constraints/IssnValidator.php is in php-symfony-validator 3.4.6+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* 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>
* @author Bernhard Schussek <bschussek@gmail.com>
*
* @see https://en.wikipedia.org/wiki/Issn
*/
class IssnValidator extends ConstraintValidator
{
/**
* {@inheritdoc}
*/
public function validate($value, Constraint $constraint)
{
if (!$constraint instanceof Issn) {
throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Issn');
}
if (null === $value || '' === $value) {
return;
}
if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
throw new UnexpectedTypeException($value, 'string');
}
$value = (string) $value;
$canonical = $value;
// 1234-567X
// ^
if (isset($canonical[4]) && '-' === $canonical[4]) {
// remove hyphen
$canonical = substr($canonical, 0, 4).substr($canonical, 5);
} elseif ($constraint->requireHyphen) {
$this->context->buildViolation($constraint->message)
->setParameter('{{ value }}', $this->formatValue($value))
->setCode(Issn::MISSING_HYPHEN_ERROR)
->addViolation();
return;
}
$length = strlen($canonical);
if ($length < 8) {
$this->context->buildViolation($constraint->message)
->setParameter('{{ value }}', $this->formatValue($value))
->setCode(Issn::TOO_SHORT_ERROR)
->addViolation();
return;
}
if ($length > 8) {
$this->context->buildViolation($constraint->message)
->setParameter('{{ value }}', $this->formatValue($value))
->setCode(Issn::TOO_LONG_ERROR)
->addViolation();
return;
}
// 1234567X
// ^^^^^^^ digits only
if (!ctype_digit(substr($canonical, 0, 7))) {
$this->context->buildViolation($constraint->message)
->setParameter('{{ value }}', $this->formatValue($value))
->setCode(Issn::INVALID_CHARACTERS_ERROR)
->addViolation();
return;
}
// 1234567X
// ^ digit, x or X
if (!ctype_digit($canonical[7]) && 'x' !== $canonical[7] && 'X' !== $canonical[7]) {
$this->context->buildViolation($constraint->message)
->setParameter('{{ value }}', $this->formatValue($value))
->setCode(Issn::INVALID_CHARACTERS_ERROR)
->addViolation();
return;
}
// 1234567X
// ^ case-sensitive?
if ($constraint->caseSensitive && 'x' === $canonical[7]) {
$this->context->buildViolation($constraint->message)
->setParameter('{{ value }}', $this->formatValue($value))
->setCode(Issn::INVALID_CASE_ERROR)
->addViolation();
return;
}
// Calculate a checksum. "X" equals 10.
$checkSum = 'X' === $canonical[7]
|| 'x' === $canonical[7]
? 10
: $canonical[7];
for ($i = 0; $i < 7; ++$i) {
// Multiply the first digit by 8, the second by 7, etc.
$checkSum += (8 - $i) * $canonical[$i];
}
if (0 !== $checkSum % 11) {
$this->context->buildViolation($constraint->message)
->setParameter('{{ value }}', $this->formatValue($value))
->setCode(Issn::CHECKSUM_FAILED_ERROR)
->addViolation();
}
}
}
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