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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;
- use Symfony\Component\Validator\Exception\UnexpectedValueException;
- /**
- * 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, Issn::class);
- }
- if (null === $value || '' === $value) {
- return;
- }
- if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
- throw new UnexpectedValueException($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) * (int) $canonical[$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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