Reschedule mail delivery if change to event is significant

sabre-io · Jan 24, 2023 · 00cf16c · 00cf16c
1 parent 1ddd773
commit 00cf16c
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/lib/CalDAV/Schedule/Plugin.php b/lib/CalDAV/Schedule/Plugin.php
@@ -638,7 +638,13 @@ protected function processICalendarChange($oldObject, VCalendar $newObject, arra
                             if ($message->scheduleStatus) {
                                 $attendee['SCHEDULE-STATUS'] = $message->getScheduleStatus();
                             }
-                            unset($attendee['SCHEDULE-FORCE-SEND']);
+
+                            // Reschedule when change to an existing event is significant,
+                            // otherwise unset SCHEDULE-FORCE-SEND. Respecting RFC 6638 3.2.8.
+                            if (!(isset($oldObject) && $message->significantChange)) {
+                                unset($attendee['SCHEDULE-FORCE-SEND']);
+                            };
+
                             break;
                         }
                     }