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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 { /** * @return void */ public function validate(mixed $value, Constraint $constraint) { if (!$constraint instanceof Issn) { throw new UnexpectedTypeException($constraint, Issn::class); } if (null === $value || '' === $value) { return; } if (!\is_scalar($value) && !$value instanceof \Stringable) { throw new UnexpectedValueException($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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