ensure user attributes are truncated (#1580)

src/Utils/StringHelper.php

@@ -0,0 +1,26 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Utils;
+
+final class StringHelper
+{
+    public static function ensureMaxLength(?string $string, int $length): ?string
+    {
+        if (null === $string) {
+            return null;
+        }
+
+        if (mb_strlen($string) > $length) {
+            $string = mb_substr($string, 0, $length);
+        }
+
+        return $string;
+    }
+}