add compatibility to nextcloud app jitsi_calendar

assets/launch.js

@@ -14,6 +14,10 @@ const CONFIG = {
    * Your Jitsi domain.
    */
   jitsiHost: "meet.bnvb-ingenieure.de",
+  /*
+   * Your Nextcloud instance (calendar event creation).
+   */
+  nextcloudBase: "https://cloud.bnvb-ingenieure.de",
   /*
    * Timeout trying to start the jitsi-meet-electron client
    */
@@ -1020,13 +1024,13 @@ function openNextcloudCalendarCreator() {
         meetingOrganizerInput.value.trim();
 
     if (!meetingName) {
-        alert('Please enter a meeting name.');
+        alert(getTranslation('creator.meetingNameRequired') || 'Please enter a meeting name.');
         meetingNameInput.focus();
         return;
     }
 
     if (!startTime || !endTime) {
-        alert('Please enter start and end time.');
+        alert(getTranslation('creator.startTimeRequired') || 'Please select a start time.');
         return;
     }
 
@@ -1040,7 +1044,18 @@ function openNextcloudCalendarCreator() {
     }
 
     if (end <= start) {
-        alert('End time must be after start time.');
+        alert(getTranslation('creator.endAfterStart') || 'End time must be after start time.');
+        return;
+    }
+
+    /*
+     * Nextcloud validiert die E-Mail serverseitig und
+     * bricht sonst mit einer Fehlerseite ab.
+     */
+    const emailPattern = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+
+    if (organizer && !emailPattern.test(organizer)) {
+        alert(getTranslation('creator.organizerInvalid') || 'Please enter a valid organizer email address.');
         return;
     }
 
@@ -1053,9 +1068,6 @@ function openNextcloudCalendarCreator() {
     const meetingUrl =
         createLaunchUrl(roomName);
 
-    const nextcloudBase =
-        'https://cloud.bnvb-ingenieure.de';
-
     const params = new URLSearchParams();
 
     params.set('summary', meetingName);
@@ -1075,7 +1087,7 @@ function openNextcloudCalendarCreator() {
     params.set('url', meetingUrl);
 
     const nextcloudUrl =
-        nextcloudBase +
+        CONFIG.nextcloudBase +
         '/index.php/apps/jitsi_calendar/confirm?' +
         params.toString();