Initial Drupal 11 with DDEV setup

vendor/symfony/validator/Constraints/IsinValidator.php

@@ -0,0 +1,78 @@
+<?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;
+
+/**
+ * @author Laurent Masforné <l.masforne@gmail.com>
+ *
+ * @see https://en.wikipedia.org/wiki/International_Securities_Identification_Number
+ */
+class IsinValidator extends ConstraintValidator
+{
+    public function validate(mixed $value, Constraint $constraint): void
+    {
+        if (!$constraint instanceof Isin) {
+            throw new UnexpectedTypeException($constraint, Isin::class);
+        }
+
+        if (null === $value || '' === $value) {
+            return;
+        }
+
+        if (!\is_scalar($value) && !$value instanceof \Stringable) {
+            throw new UnexpectedValueException($value, 'string');
+        }
+
+        $value = strtoupper($value);
+
+        if (Isin::VALIDATION_LENGTH !== \strlen($value)) {
+            $this->context->buildViolation($constraint->message)
+                ->setParameter('{{ value }}', $this->formatValue($value))
+                ->setCode(Isin::INVALID_LENGTH_ERROR)
+                ->addViolation();
+
+            return;
+        }
+
+        if (!preg_match(Isin::VALIDATION_PATTERN, $value)) {
+            $this->context->buildViolation($constraint->message)
+                ->setParameter('{{ value }}', $this->formatValue($value))
+                ->setCode(Isin::INVALID_PATTERN_ERROR)
+                ->addViolation();
+
+            return;
+        }
+
+        if (!$this->isCorrectChecksum($value)) {
+            $this->context->buildViolation($constraint->message)
+                ->setParameter('{{ value }}', $this->formatValue($value))
+                ->setCode(Isin::INVALID_CHECKSUM_ERROR)
+                ->addViolation();
+        }
+    }
+
+    private function isCorrectChecksum(string $input): bool
+    {
+        $characters = str_split($input);
+        foreach ($characters as $i => $char) {
+            $characters[$i] = \intval($char, 36);
+        }
+        $number = implode('', $characters);
+
+        return 0 === $this->context->getValidator()->validate($number, new Luhn())->count();
+    }
+}