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vendor/symfony/validator/Constraints/IsbnValidator.php

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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 ISBN-10 or ISBN-13.
+ *
+ * @author The Whole Life To Learn <thewholelifetolearn@gmail.com>
+ * @author Manuel Reinhard <manu@sprain.ch>
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ *
+ * @see https://en.wikipedia.org/wiki/Isbn
+ */
+class IsbnValidator extends ConstraintValidator
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function validate($value, Constraint $constraint)
+    {
+        if (!$constraint instanceof Isbn) {
+            throw new UnexpectedTypeException($constraint, Isbn::class);
+        }
+
+        if (null === $value || '' === $value) {
+            return;
+        }
+
+        if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
+            throw new UnexpectedValueException($value, 'string');
+        }
+
+        $value = (string) $value;
+        $canonical = str_replace('-', '', $value);
+
+        // Explicitly validate against ISBN-10
+        if (Isbn::ISBN_10 === $constraint->type) {
+            if (true !== ($code = $this->validateIsbn10($canonical))) {
+                $this->context->buildViolation($this->getMessage($constraint, $constraint->type))
+                    ->setParameter('{{ value }}', $this->formatValue($value))
+                    ->setCode($code)
+                    ->addViolation();
+            }
+
+            return;
+        }
+
+        // Explicitly validate against ISBN-13
+        if (Isbn::ISBN_13 === $constraint->type) {
+            if (true !== ($code = $this->validateIsbn13($canonical))) {
+                $this->context->buildViolation($this->getMessage($constraint, $constraint->type))
+                    ->setParameter('{{ value }}', $this->formatValue($value))
+                    ->setCode($code)
+                    ->addViolation();
+            }
+
+            return;
+        }
+
+        // Try both ISBNs
+
+        // First, try ISBN-10
+        $code = $this->validateIsbn10($canonical);
+
+        // The ISBN can only be an ISBN-13 if the value was too long for ISBN-10
+        if (Isbn::TOO_LONG_ERROR === $code) {
+            // Try ISBN-13 now
+            $code = $this->validateIsbn13($canonical);
+
+            // If too short, this means we have 11 or 12 digits
+            if (Isbn::TOO_SHORT_ERROR === $code) {
+                $code = Isbn::TYPE_NOT_RECOGNIZED_ERROR;
+            }
+        }
+
+        if (true !== $code) {
+            $this->context->buildViolation($this->getMessage($constraint))
+                ->setParameter('{{ value }}', $this->formatValue($value))
+                ->setCode($code)
+                ->addViolation();
+        }
+    }
+
+    protected function validateIsbn10(string $isbn)
+    {
+        // Choose an algorithm so that ERROR_INVALID_CHARACTERS is preferred
+        // over ERROR_TOO_SHORT/ERROR_TOO_LONG
+        // Otherwise "0-45122-5244" passes, but "0-45122_5244" reports
+        // "too long"
+
+        // Error priority:
+        // 1. ERROR_INVALID_CHARACTERS
+        // 2. ERROR_TOO_SHORT/ERROR_TOO_LONG
+        // 3. ERROR_CHECKSUM_FAILED
+
+        $checkSum = 0;
+
+        for ($i = 0; $i < 10; ++$i) {
+            // If we test the length before the loop, we get an ERROR_TOO_SHORT
+            // when actually an ERROR_INVALID_CHARACTERS is wanted, e.g. for
+            // "0-45122_5244" (typo)
+            if (!isset($isbn[$i])) {
+                return Isbn::TOO_SHORT_ERROR;
+            }
+
+            if ('X' === $isbn[$i]) {
+                $digit = 10;
+            } elseif (ctype_digit($isbn[$i])) {
+                $digit = $isbn[$i];
+            } else {
+                return Isbn::INVALID_CHARACTERS_ERROR;
+            }
+
+            $checkSum += $digit * (10 - $i);
+        }
+
+        if (isset($isbn[$i])) {
+            return Isbn::TOO_LONG_ERROR;
+        }
+
+        return 0 === $checkSum % 11 ? true : Isbn::CHECKSUM_FAILED_ERROR;
+    }
+
+    protected function validateIsbn13(string $isbn)
+    {
+        // Error priority:
+        // 1. ERROR_INVALID_CHARACTERS
+        // 2. ERROR_TOO_SHORT/ERROR_TOO_LONG
+        // 3. ERROR_CHECKSUM_FAILED
+
+        if (!ctype_digit($isbn)) {
+            return Isbn::INVALID_CHARACTERS_ERROR;
+        }
+
+        $length = \strlen($isbn);
+
+        if ($length < 13) {
+            return Isbn::TOO_SHORT_ERROR;
+        }
+
+        if ($length > 13) {
+            return Isbn::TOO_LONG_ERROR;
+        }
+
+        $checkSum = 0;
+
+        for ($i = 0; $i < 13; $i += 2) {
+            $checkSum += $isbn[$i];
+        }
+
+        for ($i = 1; $i < 12; $i += 2) {
+            $checkSum += $isbn[$i] * 3;
+        }
+
+        return 0 === $checkSum % 10 ? true : Isbn::CHECKSUM_FAILED_ERROR;
+    }
+
+    protected function getMessage(Isbn $constraint, string $type = null)
+    {
+        if (null !== $constraint->message) {
+            return $constraint->message;
+        } elseif (Isbn::ISBN_10 === $type) {
+            return $constraint->isbn10Message;
+        } elseif (Isbn::ISBN_13 === $type) {
+            return $constraint->isbn13Message;
+        }
+
+        return $constraint->bothIsbnMessage;
+    }
+}