93 lines
3.0 KiB
PHP
93 lines
3.0 KiB
PHP
<?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 a PAN using the LUHN Algorithm.
|
|
*
|
|
* For a list of example card numbers that are used to test this
|
|
* class, please see the LuhnValidatorTest class.
|
|
*
|
|
* @see http://en.wikipedia.org/wiki/Luhn_algorithm
|
|
*
|
|
* @author Tim Nagel <t.nagel@infinite.net.au>
|
|
* @author Greg Knapp http://gregk.me/2011/php-implementation-of-bank-card-luhn-algorithm/
|
|
* @author Bernhard Schussek <bschussek@gmail.com>
|
|
*/
|
|
class LuhnValidator extends ConstraintValidator
|
|
{
|
|
/**
|
|
* {@inheritdoc}
|
|
*/
|
|
public function validate(mixed $value, Constraint $constraint)
|
|
{
|
|
if (!$constraint instanceof Luhn) {
|
|
throw new UnexpectedTypeException($constraint, Luhn::class);
|
|
}
|
|
|
|
if (null === $value || '' === $value) {
|
|
return;
|
|
}
|
|
|
|
// Work with strings only, because long numbers are represented as floats
|
|
// internally and don't work with strlen()
|
|
if (!\is_string($value) && !$value instanceof \Stringable) {
|
|
throw new UnexpectedValueException($value, 'string');
|
|
}
|
|
|
|
$value = (string) $value;
|
|
|
|
if (!ctype_digit($value)) {
|
|
$this->context->buildViolation($constraint->message)
|
|
->setParameter('{{ value }}', $this->formatValue($value))
|
|
->setCode(Luhn::INVALID_CHARACTERS_ERROR)
|
|
->addViolation();
|
|
|
|
return;
|
|
}
|
|
|
|
$checkSum = 0;
|
|
$length = \strlen($value);
|
|
|
|
// Starting with the last digit and walking left, add every second
|
|
// digit to the check sum
|
|
// e.g. 7 9 9 2 7 3 9 8 7 1 3
|
|
// ^ ^ ^ ^ ^ ^
|
|
// = 7 + 9 + 7 + 9 + 7 + 3
|
|
for ($i = $length - 1; $i >= 0; $i -= 2) {
|
|
$checkSum += $value[$i];
|
|
}
|
|
|
|
// Starting with the second last digit and walking left, double every
|
|
// second digit and add it to the check sum
|
|
// For doubles greater than 9, sum the individual digits
|
|
// e.g. 7 9 9 2 7 3 9 8 7 1 3
|
|
// ^ ^ ^ ^ ^
|
|
// = 1+8 + 4 + 6 + 1+6 + 2
|
|
for ($i = $length - 2; $i >= 0; $i -= 2) {
|
|
$checkSum += array_sum(str_split((int) $value[$i] * 2));
|
|
}
|
|
|
|
if (0 === $checkSum || 0 !== $checkSum % 10) {
|
|
$this->context->buildViolation($constraint->message)
|
|
->setParameter('{{ value }}', $this->formatValue($value))
|
|
->setCode(Luhn::CHECKSUM_FAILED_ERROR)
|
|
->addViolation();
|
|
}
|
|
}
|
|
}
|