Create iTip messages for attendee on first upload

lib/ITip/Broker.php

@@ -248,13 +248,25 @@ public function parseEvent($calendar, $userHref, $oldCalendar = null): array
 
         if (in_array($eventInfo['organizer'], $userHref)) {
             return $this->parseEventForOrganizer($baseCalendar, $eventInfo, $oldEventInfo);
-        } elseif ($oldCalendar) {
-            // We need to figure out if the user is an attendee, but we're only
-            // doing so if there's an oldCalendar, because we only want to
-            // process updates, not creation of new events.
+        } else {
+            // We need to figure out if the user is an attendee. If
+            // that is the case, we want to process that attendee if
+            // there is also an oldcalendar or if some of the
+            // instances of that attendee has partstat different from
+            // NEEDS-ACTION. See
+            // https://github.com/sabre-io/vobject/issues/719
             foreach ($eventInfo['attendees'] as $attendee) {
                 if (in_array($attendee['href'], $userHref)) {
-                    return $this->parseEventForAttendee($baseCalendar, $eventInfo, $oldEventInfo, $attendee['href']);
+                    $isPartstatDefined = false;
+                    foreach ($attendee['instances'] as $instance) {
+                        if ('NEEDS-ACTION' != $instance['partstat']) {
+                            $isPartstatDefined = true;
+                            break;
+                        }
+                    }
+                    if ($oldCalendar or $isPartstatDefined) {
+                        return $this->parseEventForAttendee($baseCalendar, $eventInfo, $oldEventInfo, $attendee['href']);
+                    }
                 }
             }
         }

tests/VObject/Component/VAvailabilityTest.php

@@ -435,8 +435,7 @@ protected function template(array $properties)
 …
 END:VAVAILABILITY
 END:VCALENDAR
-VCAL
-            ,
+VCAL,
             $properties
         );
     }
@@ -459,8 +458,7 @@ protected function templateAvailable(array $properties)
 END:AVAILABLE
 END:VAVAILABILITY
 END:VCALENDAR
-VCAL
-            ,
+VCAL,
             $properties
         );
     }

tests/VObject/ITip/BrokerAttendeeReplyTest.php

@@ -6,19 +6,15 @@ class BrokerAttendeeReplyTest extends BrokerTester
 {
     public function testAccepted(): void
     {
-        $oldMessage = <<<ICS
-BEGIN:VCALENDAR
-VERSION:2.0
-BEGIN:VEVENT
-UID:foobar
-SUMMARY:B-day party
-SEQUENCE:1
-ORGANIZER;CN=Strunk:mailto:strunk@example.org
-ATTENDEE;CN=One:mailto:one@example.org
-DTSTART:20140716T120000Z
-END:VEVENT
-END:VCALENDAR
-ICS;
+        // If $oldMessage is not set, in some cases an iTip message
+        // still needs to be generated; this happens when partstat
+        // differs from NEEDS-ACTION. For example, this is relevant in
+        // cases where a CalDAV client has received a calendar invite
+        // in some way, and the user of the client accepts
+        // participation before the upload. Also see
+        // https://github.com/sabre-io/vobject/issues/719
+
+        $oldMessage = '';
 
         $newMessage = <<<ICS
 BEGIN:VCALENDAR