129 lines
4.0 KiB
PHP
129 lines
4.0 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Validator\Constraints;
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use Symfony\Component\Validator\Constraint;
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use Symfony\Component\Validator\ConstraintValidator;
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use Symfony\Component\Validator\Exception\UnexpectedTypeException;
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use Symfony\Component\Validator\Exception\UnexpectedValueException;
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/**
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* Validates whether the value is a valid ISSN.
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*
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* @author Antonio J. García Lagar <aj@garcialagar.es>
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* @author Bernhard Schussek <bschussek@gmail.com>
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*
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* @see https://en.wikipedia.org/wiki/Issn
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*/
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class IssnValidator extends ConstraintValidator
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{
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public function validate(mixed $value, Constraint $constraint): void
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{
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if (!$constraint instanceof Issn) {
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throw new UnexpectedTypeException($constraint, Issn::class);
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}
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if (null === $value || '' === $value) {
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return;
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}
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if (!\is_scalar($value) && !$value instanceof \Stringable) {
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throw new UnexpectedValueException($value, 'string');
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}
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$value = (string) $value;
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$canonical = $value;
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// 1234-567X
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// ^
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if (isset($canonical[4]) && '-' === $canonical[4]) {
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// remove hyphen
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$canonical = substr($canonical, 0, 4).substr($canonical, 5);
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} elseif ($constraint->requireHyphen) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Issn::MISSING_HYPHEN_ERROR)
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->addViolation();
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return;
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}
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$length = \strlen($canonical);
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if ($length < 8) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Issn::TOO_SHORT_ERROR)
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->addViolation();
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return;
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}
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if ($length > 8) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Issn::TOO_LONG_ERROR)
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->addViolation();
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return;
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}
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// 1234567X
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// ^^^^^^^ digits only
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if (!ctype_digit(substr($canonical, 0, 7))) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Issn::INVALID_CHARACTERS_ERROR)
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->addViolation();
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return;
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}
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// 1234567X
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// ^ digit, x or X
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if (!ctype_digit($canonical[7]) && 'x' !== $canonical[7] && 'X' !== $canonical[7]) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Issn::INVALID_CHARACTERS_ERROR)
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->addViolation();
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return;
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}
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// 1234567X
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// ^ case-sensitive?
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if ($constraint->caseSensitive && 'x' === $canonical[7]) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Issn::INVALID_CASE_ERROR)
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->addViolation();
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return;
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}
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// Calculate a checksum. "X" equals 10.
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$checkSum = 'X' === $canonical[7] || 'x' === $canonical[7] ? 10 : $canonical[7];
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for ($i = 0; $i < 7; ++$i) {
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// Multiply the first digit by 8, the second by 7, etc.
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$checkSum += (8 - $i) * (int) $canonical[$i];
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}
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if (0 !== $checkSum % 11) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Issn::CHECKSUM_FAILED_ERROR)
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->addViolation();
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}
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}
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}
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