<?php
namespace MailPoetVendor\Symfony\Component\Validator\Constraints;
if (!defined('ABSPATH')) exit;
use MailPoetVendor\Symfony\Component\Validator\Constraint;
use MailPoetVendor\Symfony\Component\Validator\ConstraintValidator;
use MailPoetVendor\Symfony\Component\Validator\Exception\UnexpectedTypeException;
use MailPoetVendor\Symfony\Component\Validator\Exception\UnexpectedValueException;
class LuhnValidator extends ConstraintValidator
{
public function validate($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) && !(\is_object($value) && \method_exists($value, '__toString'))) {
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();
}
}
}