do not open iframe with invalid url and show hint in vue component, fixes #2169, fixes #2168

Closes #2169 and #2168

Merge request studip/studip!1640

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/models/QuestionnaireInfo.php b/lib/models/QuestionnaireInfo.php
index 0b1493c..ffc09ff 100644
--- a/lib/models/QuestionnaireInfo.php
+++ b/lib/models/QuestionnaireInfo.php
@@ -63,4 +63,15 @@ class QuestionnaireInfo extends QuestionnaireQuestion implements QuestionType
     {
         return [];
     }
+
+    /**
+     * Return whether a given url is valid.
+     * @return bool
+     */
+    public function hasValidURL(): bool
+    {
+        return !empty($this->questiondata['url'])
+            && trim($this->questiondata['url'])
+            && filter_var($this->questiondata['url'], FILTER_VALIDATE_URL);
+    }
 }