feat: add iMip Request Handling

Signed-off-by: SebastianKrupinski <[email protected]>

apps/dav/lib/CalDAV/CalendarImpl.php

@@ -132,13 +132,27 @@ public function getPermissions(): int {
  return $result;
  }
 
+ /**
+ * @since 31.0.0
+ */
+ public function isWritable(): bool {
+ return $this->calendar->canWrite();
+ }
+
  /**
  * @since 26.0.0
  */
  public function isDeleted(): bool {
  return $this->calendar->isDeleted();
  }
 
+ /**
+ * @since 31.0.0
+ */
+ public function isShared(): bool {
+ return $this->calendar->isShared();
+ }
+
  /**
  * Create a new calendar event for this calendar
  * by way of an ICS string

lib/private/Calendar/Manager.php

@@ -204,6 +204,80 @@ public function newQuery(string $principalUri): ICalendarQuery {
  return new CalendarQuery($principalUri);
  }
 
+ /**
+ * @since 31.0.0
+ * @throws \OCP\DB\Exception
+ */
+ public function handleIMipRequest(
+ string $principalUri,
+ string $sender,
+ string $recipient,
+ string $calendarData,
+ ): bool {
+ // determine if user has any calendars
+ $userCalendars = $this->getCalendarsForPrincipal($principalUri);
+ if (empty($userCalendars)) {
+ $this->logger->warning('Could not find any calendars for principal ' . $principalUri);
+ return false;
+ }
+ // convert calendar string data to calendar object
+ /** @var VCalendar $vObject|null */
+ $calendarObject = Reader::read($calendarData);
+ // determine if event has the correct method
+ if (!isset($calendarObject->METHOD) || $calendarObject->METHOD->getValue() !== 'REQUEST') {
+ $this->logger->warning('iMip message event contains an incorrect or invalid method');
+ return false;
+ }
+ // determine if calendar object contains any events
+ if (!isset($calendarObject->VEVENT)) {
+ $this->logger->warning('iMip message contains an no event');
+ return false;
+ }
+ // extract event(s)
+ $eventObject = $calendarObject->VEVENT;
+ // determine if event contains a uid
+ if (!isset($eventObject->UID)) {
+ $this->logger->warning('iMip message event dose not contains a UID');
+ return false;
+ }
+ // determine if event contains any attendees
+ if (!isset($eventObject->ATTENDEE)) {
+ $this->logger->warning('iMip message event dose not contains any attendees');
+ return false;
+ }
+ // determine if any of the attendees are the recipient
+ foreach ($eventObject->ATTENDEE as $entry) {
+ $address = trim(str_replace('mailto:', '', $entry->getValue()));
+ if ($address === $recipient) {
+ $attendee = $address;
+ break;
+ }
+ }
+ if (!isset($attendee)) {
+ $this->logger->warning('iMip message event does not contain a attendee that matches the recipient');
+ return false;
+ }
+ // find event in calendar and update it
+ foreach ($userCalendars as $calendar) {
+ // determine if calendar is deleted, shared, or read only and ignore
+ if ($calendar->isDeleted() || !$calendar->isWritable() || $calendar->isShared()) {
+ continue;
+ }
+ // find event and update it
+ if (!empty($calendar->search($recipient, ['ATTENDEE'], ['uid' => $eventObject->UID->getValue()]))) {
+ try {
+ $calendar->handleIMipMessage('', $calendarData); // sabre will handle the scheduling behind the scenes
+ return true;
+ } catch (CalendarException $e) {
+ $this->logger->error('Could not update calendar for iMIP processing', ['exception' => $e]);
+ return false;
+ }
+ }
+ }
+
+ return false;
+ }
+
  /**
  * @throws \OCP\DB\Exception
  */