Use server side library to generate QR-Code for Google authenticator.

This saves us 50KB in javascript assets...

src/Twig/BarcodeExtension.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Twig;
+
+
+use Com\Tecnick\Barcode\Barcode;
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFilter;
+
+class BarcodeExtension extends AbstractExtension
+{
+    public function getFilters()
+    {
+        return [
+            new TwigFilter('barcodeSVG', function (string $content, string $type = "QRCODE") {
+                $barcodeFactory = new Barcode();
+                $barcode = $barcodeFactory->getBarcodeObj($type, $content);
+                return $barcode->getSvgCode();
+            }),
+        ];
+    }
+}