Sabre\VObject\ITip\Broker::parseEventForAttendee PHP Method

    protected function parseEventForAttendee(VCalendar $calendar, array $eventInfo, array $oldEventInfo, $attendee)
    {
        if ($this->scheduleAgentServerRules && $eventInfo['organizerScheduleAgent'] === 'CLIENT') {
            return array();
        }
        // Don't bother generating messages for events that have already been
        // cancelled.
        if ($eventInfo['status'] === 'CANCELLED') {
            return array();
        }
        $oldInstances = !empty($oldEventInfo['attendees'][$attendee]['instances']) ? $oldEventInfo['attendees'][$attendee]['instances'] : array();
        $instances = array();
        foreach ($oldInstances as $instance) {
            $instances[$instance['id']] = array('id' => $instance['id'], 'oldstatus' => $instance['partstat'], 'newstatus' => null);
        }
        foreach ($eventInfo['attendees'][$attendee]['instances'] as $instance) {
            if (isset($instances[$instance['id']])) {
                $instances[$instance['id']]['newstatus'] = $instance['partstat'];
            } else {
                $instances[$instance['id']] = array('id' => $instance['id'], 'oldstatus' => null, 'newstatus' => $instance['partstat']);
            }
        }
        // We need to also look for differences in EXDATE. If there are new
        // items in EXDATE, it means that an attendee deleted instances of an
        // event, which means we need to send DECLINED specifically for those
        // instances.
        // We only need to do that though, if the master event is not declined.
        if (isset($instances['master']) && $instances['master']['newstatus'] !== 'DECLINED') {
            foreach ($eventInfo['exdate'] as $exDate) {
                if (!in_array($exDate, $oldEventInfo['exdate'])) {
                    if (isset($instances[$exDate])) {
                        $instances[$exDate]['newstatus'] = 'DECLINED';
                    } else {
                        $instances[$exDate] = array('id' => $exDate, 'oldstatus' => null, 'newstatus' => 'DECLINED');
                    }
                }
            }
        }
        // Gathering a few extra properties for each instance.
        foreach ($instances as $recurId => $instanceInfo) {
            if (isset($eventInfo['instances'][$recurId])) {
                $instances[$recurId]['dtstart'] = clone $eventInfo['instances'][$recurId]->DTSTART;
            } else {
                $instances[$recurId]['dtstart'] = $recurId;
            }
        }
        $message = new Message();
        $message->uid = $eventInfo['uid'];
        $message->method = 'REPLY';
        $message->component = 'VEVENT';
        $message->sequence = $eventInfo['sequence'];
        $message->sender = $attendee;
        $message->senderName = $eventInfo['attendees'][$attendee]['name'];
        $message->recipient = $eventInfo['organizer'];
        $message->recipientName = $eventInfo['organizerName'];
        $icalMsg = new VCalendar();
        $icalMsg->METHOD = 'REPLY';
        $hasReply = false;
        foreach ($instances as $instance) {
            if ($instance['oldstatus'] == $instance['newstatus'] && $eventInfo['organizerForceSend'] !== 'REPLY') {
                // Skip
                continue;
            }
            $event = $icalMsg->add('VEVENT', array('UID' => $message->uid, 'SEQUENCE' => $message->sequence));
            $summary = isset($calendar->VEVENT->SUMMARY) ? $calendar->VEVENT->SUMMARY->getValue() : '';
            // Adding properties from the correct source instance
            if (isset($eventInfo['instances'][$instance['id']])) {
                $instanceObj = $eventInfo['instances'][$instance['id']];
                $event->add(clone $instanceObj->DTSTART);
                if (isset($instanceObj->DTEND)) {
                    $event->add(clone $instanceObj->DTEND);
                } elseif (isset($instanceObj->DURATION)) {
                    $event->add(clone $instanceObj->DURATION);
                }
                if (isset($instanceObj->SUMMARY)) {
                    $event->add('SUMMARY', $instanceObj->SUMMARY->getValue());
                } elseif ($summary) {
                    $event->add('SUMMARY', $summary);
                }
            } else {
                // This branch of the code is reached, when a reply is
                // generated for an instance of a recurring event, through the
                // fact that the instance has disappeared by showing up in
                // EXDATE
                $dt = DateTimeParser::parse($instance['id'], $eventInfo['timezone']);
                // Treat is as a DATE field
                if (strlen($instance['id']) <= 8) {
                    $recur = $event->add('DTSTART', $dt, array('VALUE' => 'DATE'));
                } else {
                    $recur = $event->add('DTSTART', $dt);
                }
                if ($summary) {
                    $event->add('SUMMARY', $summary);
                }
            }
            if ($instance['id'] !== 'master') {
                $dt = DateTimeParser::parse($instance['id'], $eventInfo['timezone']);
                // Treat is as a DATE field
                if (strlen($instance['id']) <= 8) {
                    $recur = $event->add('RECURRENCE-ID', $dt, array('VALUE' => 'DATE'));
                } else {
                    $recur = $event->add('RECURRENCE-ID', $dt);
                }
            }
            $organizer = $event->add('ORGANIZER', $message->recipient);
            if ($message->recipientName) {
                $organizer['CN'] = $message->recipientName;
            }
            $attendee = $event->add('ATTENDEE', $message->sender, array('PARTSTAT' => $instance['newstatus']));
            if ($message->senderName) {
                $attendee['CN'] = $message->senderName;
            }
            $hasReply = true;
        }
        if ($hasReply) {
            $message->message = $icalMsg;
            return array($message);
        } else {
            return array();
        }
    }