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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OCA\DAV\CalDAV;
use Sabre\VObject\Component\VCalendar;
use Sabre\VObject\ITip\Broker;
use Sabre\VObject\ITip\Message;
class TipBroker extends Broker {
public $significantChangeProperties = [
'DTSTART',
'DTEND',
'DURATION',
'DUE',
'RRULE',
'RDATE',
'EXDATE',
'STATUS',
'SUMMARY',
'DESCRIPTION',
'LOCATION',
];
/**
* This method is used in cases where an event got updated, and we
* potentially need to send emails to attendees to let them know of updates
* in the events.
*
* We will detect which attendees got added, which got removed and create
* specific messages for these situations.
*
* @return array
*/
protected function parseEventForOrganizer(VCalendar $calendar, array $eventInfo, array $oldEventInfo) {
// Merging attendee lists.
$attendees = [];
foreach ($oldEventInfo['attendees'] as $attendee) {
$attendees[$attendee['href']] = [
'href' => $attendee['href'],
'oldInstances' => $attendee['instances'],
'newInstances' => [],
'name' => $attendee['name'],
'forceSend' => null,
];
}
foreach ($eventInfo['attendees'] as $attendee) {
if (isset($attendees[$attendee['href']])) {
$attendees[$attendee['href']]['name'] = $attendee['name'];
$attendees[$attendee['href']]['newInstances'] = $attendee['instances'];
$attendees[$attendee['href']]['forceSend'] = $attendee['forceSend'];
} else {
$attendees[$attendee['href']] = [
'href' => $attendee['href'],
'oldInstances' => [],
'newInstances' => $attendee['instances'],
'name' => $attendee['name'],
'forceSend' => $attendee['forceSend'],
];
}
}
$messages = [];
foreach ($attendees as $attendee) {
// An organizer can also be an attendee. We should not generate any
// messages for those.
if ($attendee['href'] === $eventInfo['organizer']) {
continue;
}
$message = new Message();
$message->uid = $eventInfo['uid'];
$message->component = 'VEVENT';
$message->sequence = $eventInfo['sequence'];
$message->sender = $eventInfo['organizer'];
$message->senderName = $eventInfo['organizerName'];
$message->recipient = $attendee['href'];
$message->recipientName = $attendee['name'];
// Creating the new iCalendar body.
$icalMsg = new VCalendar();
foreach ($calendar->select('VTIMEZONE') as $timezone) {
$icalMsg->add(clone $timezone);
}
// If there are no instances the attendee is a part of, it means
// the attendee was removed and we need to send them a CANCEL message.
// Also If the meeting STATUS property was changed to CANCELLED
// we need to send the attendee a CANCEL message.
if (!$attendee['newInstances'] || $eventInfo['status'] === 'CANCELLED') {
$message->method = $icalMsg->METHOD = 'CANCEL';
$message->significantChange = true;
// clone base event
$event = clone $eventInfo['instances']['master'];
// alter some properties
unset($event->ATTENDEE);
$event->add('ATTENDEE', $attendee['href'], ['CN' => $attendee['name'],]);
$event->DTSTAMP = gmdate('Ymd\\THis\\Z');
$event->SEQUENCE = $message->sequence;
$icalMsg->add($event);
} else {
// The attendee gets the updated event body
$message->method = $icalMsg->METHOD = 'REQUEST';
// We need to find out that this change is significant. If it's
// not, systems may opt to not send messages.
//
// We do this based on the 'significantChangeHash' which is
// some value that changes if there's a certain set of
// properties changed in the event, or simply if there's a
// difference in instances that the attendee is invited to.
$oldAttendeeInstances = array_keys($attendee['oldInstances']);
$newAttendeeInstances = array_keys($attendee['newInstances']);
$message->significantChange =
$attendee['forceSend'] === 'REQUEST' ||
count($oldAttendeeInstances) !== count($newAttendeeInstances) ||
count(array_diff($oldAttendeeInstances, $newAttendeeInstances)) > 0 ||
$oldEventInfo['significantChangeHash'] !== $eventInfo['significantChangeHash'];
foreach ($attendee['newInstances'] as $instanceId => $instanceInfo) {
$currentEvent = clone $eventInfo['instances'][$instanceId];
if ($instanceId === 'master') {
// We need to find a list of events that the attendee
// is not a part of to add to the list of exceptions.
$exceptions = [];
foreach ($eventInfo['instances'] as $instanceId => $vevent) {
if (!isset($attendee['newInstances'][$instanceId])) {
$exceptions[] = $instanceId;
}
}
// If there were exceptions, we need to add it to an
// existing EXDATE property, if it exists.
if ($exceptions) {
if (isset($currentEvent->EXDATE)) {
$currentEvent->EXDATE->setParts(array_merge(
$currentEvent->EXDATE->getParts(),
$exceptions
));
} else {
$currentEvent->EXDATE = $exceptions;
}
}
// Cleaning up any scheduling information that
// shouldn't be sent along.
unset($currentEvent->ORGANIZER['SCHEDULE-FORCE-SEND']);
unset($currentEvent->ORGANIZER['SCHEDULE-STATUS']);
foreach ($currentEvent->ATTENDEE as $attendee) {
unset($attendee['SCHEDULE-FORCE-SEND']);
unset($attendee['SCHEDULE-STATUS']);
// We're adding PARTSTAT=NEEDS-ACTION to ensure that
// iOS shows an "Inbox Item"
if (!isset($attendee['PARTSTAT'])) {
$attendee['PARTSTAT'] = 'NEEDS-ACTION';
}
}
}
$currentEvent->DTSTAMP = gmdate('Ymd\\THis\\Z');
$icalMsg->add($currentEvent);
}
}
$message->message = $icalMsg;
$messages[] = $message;
}
return $messages;
}
}
|
