fixes #3571

Closes #3571

Merge request studip/studip!2462

app/controllers/blubber.php

@@ -351,7 +351,7 @@ class BlubberController extends AuthenticatedController
                     if (mb_strpos($file['type'], 'video') !== false) {
                         $type = 'video';
                     }
-                    if (mb_strpos($file['type'], 'audio') !== false || mb_strpos($file_ref['name'], '.ogg') !== false) {
+                    if (mb_strpos($file['type'], 'audio') !== false || mb_strpos($file['name'], '.ogg') !== false) {
                         $type = 'audio';
                     }
                     if ($type) {

lib/classes/StudipCoreFormat.php

@@ -568,7 +568,8 @@ class StudipCoreFormat extends TextFormat
         if (
             in_array($pu['scheme'], ['http', 'https'])
             && (
-                $pu['host'] === $_SERVER['HTTP_HOST']
+                !isset($pu['host'])
+                || $pu['host'] === $_SERVER['HTTP_HOST']
                 || (isset($pu['port']) && $pu['host'] . ':' . $pu['port'] === $_SERVER['HTTP_HOST'])
             )
             && mb_strpos($pu['path'], $GLOBALS['CANONICAL_RELATIVE_PATH_STUDIP']) === 0

lib/visual.inc.php

@@ -313,7 +313,7 @@ function idna_link($link, $mail = false) {
         return $link;
     }
     $pu = @parse_url($link);
-    if (preg_match('/&\w+;/i', $pu['host'])) { //umlaute?  (html-coded)
+    if (isset($pu['host']) && preg_match('/&\w+;/i', $pu['host'])) { //umlaute?  (html-coded)
         $IDN = new Algo26\IdnaConvert\ToIdn();
         $out = false;
         if ($mail){