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vendor/workerman/validation/library/Rules/Base64.php

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+<?php
+
+/*
+ * This file is part of Respect/Validation.
+ *
+ * (c) Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
+ *
+ * For the full copyright and license information, please view the LICENSE file
+ * that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Respect\Validation\Rules;
+
+use function is_string;
+use function mb_strlen;
+use function preg_match;
+
+/**
+ * Validate if a string is Base64-encoded.
+ *
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ * @author Jens Segers <segers.jens@gmail.com>
+ * @author William Espindola <oi@williamespindola.com.br>
+ */
+final class Base64 extends AbstractRule
+{
+    /**
+     * {@inheritDoc}
+     */
+    public function validate($input): bool
+    {
+        if (!is_string($input)) {
+            return false;
+        }
+
+        if (!preg_match('#^[A-Za-z0-9+/\n\r]+={0,2}$#', $input)) {
+            return false;
+        }
+
+        return mb_strlen($input) % 4 === 0;
+    }
+}