component) { return false; } switch ($itipMessage->method) { case 'REQUEST': return $this->processMessageRequest($itipMessage, $existingObject); case 'CANCEL': return $this->processMessageCancel($itipMessage, $existingObject); case 'REPLY': return $this->processMessageReply($itipMessage, $existingObject); default: // Unsupported iTip message return; } return $existingObject; } /** * This function parses a VCALENDAR object and figure out if any messages * need to be sent. * * A VCALENDAR object will be created from the perspective of either an * attendee, or an organizer. You must pass a string identifying the * current user, so we can figure out who in the list of attendees or the * organizer we are sending this message on behalf of. * * It's possible to specify the current user as an array, in case the user * has more than one identifying href (such as multiple emails). * * It $oldCalendar is specified, it is assumed that the operation is * updating an existing event, which means that we need to look at the * differences between events, and potentially send old attendees * cancellations, and current attendees updates. * * If $calendar is null, but $oldCalendar is specified, we treat the * operation as if the user has deleted an event. If the user was an * organizer, this means that we need to send cancellation notices to * people. If the user was an attendee, we need to make sure that the * organizer gets the 'declined' message. * * @param VCalendar|string $calendar * @param string|array $userHref * @param VCalendar|string $oldCalendar * * @return array */ public function parseEvent($calendar, $userHref, $oldCalendar = null) { if ($oldCalendar) { if (is_string($oldCalendar)) { $oldCalendar = Reader::read($oldCalendar); } if (!isset($oldCalendar->VEVENT)) { // We only support events at the moment return []; } $oldEventInfo = $this->parseEventInfo($oldCalendar); } else { $oldEventInfo = [ 'organizer' => null, 'significantChangeHash' => '', 'attendees' => [], ]; } $userHref = (array) $userHref; if (!is_null($calendar)) { if (is_string($calendar)) { $calendar = Reader::read($calendar); } if (!isset($calendar->VEVENT)) { // We only support events at the moment return []; } $eventInfo = $this->parseEventInfo($calendar); if (!$eventInfo['attendees'] && !$oldEventInfo['attendees']) { // If there were no attendees on either side of the equation, // we don't need to do anything. return []; } if (!$eventInfo['organizer'] && !$oldEventInfo['organizer']) { // There was no organizer before or after the change. return []; } $baseCalendar = $calendar; // If the new object didn't have an organizer, the organizer // changed the object from a scheduling object to a non-scheduling // object. We just copy the info from the old object. if (!$eventInfo['organizer'] && $oldEventInfo['organizer']) { $eventInfo['organizer'] = $oldEventInfo['organizer']; $eventInfo['organizerName'] = $oldEventInfo['organizerName']; } } else { // The calendar object got deleted, we need to process this as a // cancellation / decline. if (!$oldCalendar) { // No old and no new calendar, there's no thing to do. return []; } $eventInfo = $oldEventInfo; if (in_array($eventInfo['organizer'], $userHref)) { // This is an organizer deleting the event. $eventInfo['attendees'] = []; // Increasing the sequence, but only if the organizer deleted // the event. ++$eventInfo['sequence']; } else { // This is an attendee deleting the event. foreach ($eventInfo['attendees'] as $key => $attendee) { if (in_array($attendee['href'], $userHref)) { $eventInfo['attendees'][$key]['instances'] = ['master' => ['id' => 'master', 'partstat' => 'DECLINED'], ]; } } } $baseCalendar = $oldCalendar; } if (in_array($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. foreach ($eventInfo['attendees'] as $attendee) { if (in_array($attendee['href'], $userHref)) { return $this->parseEventForAttendee($baseCalendar, $eventInfo, $oldEventInfo, $attendee['href']); } } } return []; } /** * Processes incoming REQUEST messages. * * This is message from an organizer, and is either a new event * invite, or an update to an existing one. * * @param VCalendar $existingObject * * @return VCalendar|null */ protected function processMessageRequest(Message $itipMessage, VCalendar $existingObject = null) { if (!$existingObject) { // This is a new invite, and we're just going to copy over // all the components from the invite. $existingObject = new VCalendar(); foreach ($itipMessage->message->getComponents() as $component) { $existingObject->add(clone $component); } } else { // We need to update an existing object with all the new // information. We can just remove all existing components // and create new ones. foreach ($existingObject->getComponents() as $component) { $existingObject->remove($component); } foreach ($itipMessage->message->getComponents() as $component) { $existingObject->add(clone $component); } } return $existingObject; } /** * Processes incoming CANCEL messages. * * This is a message from an organizer, and means that either an * attendee got removed from an event, or an event got cancelled * altogether. * * @param VCalendar $existingObject * * @return VCalendar|null */ protected function processMessageCancel(Message $itipMessage, VCalendar $existingObject = null) { if (!$existingObject) { // The event didn't exist in the first place, so we're just // ignoring this message. } else { foreach ($existingObject->VEVENT as $vevent) { $vevent->STATUS = 'CANCELLED'; $vevent->SEQUENCE = $itipMessage->sequence; } } return $existingObject; } /** * Processes incoming REPLY messages. * * The message is a reply. This is for example an attendee telling * an organizer he accepted the invite, or declined it. * * @param VCalendar $existingObject * * @return VCalendar|null */ protected function processMessageReply(Message $itipMessage, VCalendar $existingObject = null) { // A reply can only be processed based on an existing object. // If the object is not available, the reply is ignored. if (!$existingObject) { return; } $instances = []; $requestStatus = '2.0'; // Finding all the instances the attendee replied to. foreach ($itipMessage->message->VEVENT as $vevent) { $recurId = isset($vevent->{'RECURRENCE-ID'}) ? $vevent->{'RECURRENCE-ID'}->getValue() : 'master'; $attendee = $vevent->ATTENDEE; $instances[$recurId] = $attendee['PARTSTAT']->getValue(); if (isset($vevent->{'REQUEST-STATUS'})) { $requestStatus = $vevent->{'REQUEST-STATUS'}->getValue(); list($requestStatus) = explode(';', $requestStatus); } } // Now we need to loop through the original organizer event, to find // all the instances where we have a reply for. $masterObject = null; foreach ($existingObject->VEVENT as $vevent) { $recurId = isset($vevent->{'RECURRENCE-ID'}) ? $vevent->{'RECURRENCE-ID'}->getValue() : 'master'; if ('master' === $recurId) { $masterObject = $vevent; } if (isset($instances[$recurId])) { $attendeeFound = false; if (isset($vevent->ATTENDEE)) { foreach ($vevent->ATTENDEE as $attendee) { if ($attendee->getValue() === $itipMessage->sender) { $attendeeFound = true; $attendee['PARTSTAT'] = $instances[$recurId]; $attendee['SCHEDULE-STATUS'] = $requestStatus; // Un-setting the RSVP status, because we now know // that the attendee already replied. unset($attendee['RSVP']); break; } } } if (!$attendeeFound) { // Adding a new attendee. The iTip documentation calls this // a party crasher. $attendee = $vevent->add('ATTENDEE', $itipMessage->sender, [ 'PARTSTAT' => $instances[$recurId], ]); if ($itipMessage->senderName) { $attendee['CN'] = $itipMessage->senderName; } } unset($instances[$recurId]); } } if (!$masterObject) { // No master object, we can't add new instances. return; } // If we got replies to instances that did not exist in the // original list, it means that new exceptions must be created. foreach ($instances as $recurId => $partstat) { $recurrenceIterator = new EventIterator($existingObject, $itipMessage->uid); $found = false; $iterations = 1000; do { $newObject = $recurrenceIterator->getEventObject(); $recurrenceIterator->next(); if (isset($newObject->{'RECURRENCE-ID'}) && $newObject->{'RECURRENCE-ID'}->getValue() === $recurId) { $found = true; } --$iterations; } while ($recurrenceIterator->valid() && !$found && $iterations); // Invalid recurrence id. Skipping this object. if (!$found) { continue; } unset( $newObject->RRULE, $newObject->EXDATE, $newObject->RDATE ); $attendeeFound = false; if (isset($newObject->ATTENDEE)) { foreach ($newObject->ATTENDEE as $attendee) { if ($attendee->getValue() === $itipMessage->sender) { $attendeeFound = true; $attendee['PARTSTAT'] = $partstat; break; } } } if (!$attendeeFound) { // Adding a new attendee $attendee = $newObject->add('ATTENDEE', $itipMessage->sender, [ 'PARTSTAT' => $partstat, ]); if ($itipMessage->senderName) { $attendee['CN'] = $itipMessage->senderName; } } $existingObject->add($newObject); } return $existingObject; } /** * 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 $timezone); } if (!$attendee['newInstances']) { // If there are no instances the attendee is a part of, it // means the attendee was removed and we need to send him a // CANCEL. $message->method = 'CANCEL'; $icalMsg->METHOD = $message->method; $event = $icalMsg->add('VEVENT', [ 'UID' => $message->uid, 'SEQUENCE' => $message->sequence, 'DTSTAMP' => gmdate('Ymd\\THis\\Z'), ]); if (isset($calendar->VEVENT->SUMMARY)) { $event->add('SUMMARY', $calendar->VEVENT->SUMMARY->getValue()); } $event->add(clone $calendar->VEVENT->DTSTART); if (isset($calendar->VEVENT->DTEND)) { $event->add(clone $calendar->VEVENT->DTEND); } elseif (isset($calendar->VEVENT->DURATION)) { $event->add(clone $calendar->VEVENT->DURATION); } $org = $event->add('ORGANIZER', $eventInfo['organizer']); if ($eventInfo['organizerName']) { $org['CN'] = $eventInfo['organizerName']; } $event->add('ATTENDEE', $attendee['href'], [ 'CN' => $attendee['name'], ]); $message->significantChange = true; } else { // The attendee gets the updated event body $message->method = 'REQUEST'; $icalMsg->METHOD = $message->method; // 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 = 'REQUEST' === $attendee['forceSend'] || count($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 ('master' === $instanceId) { // 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; } /** * Parse an event update for an attendee. * * This function figures out if we need to send a reply to an organizer. * * @param string $attendee * * @return Message[] */ protected function parseEventForAttendee(VCalendar $calendar, array $eventInfo, array $oldEventInfo, $attendee) { if ($this->scheduleAgentServerRules && 'CLIENT' === $eventInfo['organizerScheduleAgent']) { return []; } // Don't bother generating messages for events that have already been // cancelled. if ('CANCELLED' === $eventInfo['status']) { return []; } $oldInstances = !empty($oldEventInfo['attendees'][$attendee]['instances']) ? $oldEventInfo['attendees'][$attendee]['instances'] : []; $instances = []; foreach ($oldInstances as $instance) { $instances[$instance['id']] = [ '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']] = [ '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']) && 'DECLINED' !== $instances['master']['newstatus']) { foreach ($eventInfo['exdate'] as $exDate) { if (!in_array($exDate, $oldEventInfo['exdate'])) { if (isset($instances[$exDate])) { $instances[$exDate]['newstatus'] = 'DECLINED'; } else { $instances[$exDate] = [ '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(); $icalMsg->METHOD = 'REPLY'; foreach ($calendar->select('VTIMEZONE') as $timezone) { $icalMsg->add(clone $timezone); } $hasReply = false; foreach ($instances as $instance) { if ($instance['oldstatus'] == $instance['newstatus'] && 'REPLY' !== $eventInfo['organizerForceSend']) { // Skip continue; } $event = $icalMsg->add('VEVENT', [ '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) { $event->add('DTSTART', $dt, ['VALUE' => 'DATE']); } else { $event->add('DTSTART', $dt); } if ($summary) { $event->add('SUMMARY', $summary); } } if ('master' !== $instance['id']) { $dt = DateTimeParser::parse($instance['id'], $eventInfo['timezone']); // Treat is as a DATE field if (strlen($instance['id']) <= 8) { $event->add('RECURRENCE-ID', $dt, ['VALUE' => 'DATE']); } else { $event->add('RECURRENCE-ID', $dt); } } $organizer = $event->add('ORGANIZER', $message->recipient); if ($message->recipientName) { $organizer['CN'] = $message->recipientName; } $attendee = $event->add('ATTENDEE', $message->sender, [ 'PARTSTAT' => $instance['newstatus'], ]); if ($message->senderName) { $attendee['CN'] = $message->senderName; } $hasReply = true; } if ($hasReply) { $message->message = $icalMsg; return [$message]; } else { return []; } } /** * Returns attendee information and information about instances of an * event. * * Returns an array with the following keys: * * 1. uid * 2. organizer * 3. organizerName * 4. organizerScheduleAgent * 5. organizerForceSend * 6. instances * 7. attendees * 8. sequence * 9. exdate * 10. timezone - strictly the timezone on which the recurrence rule is * based on. * 11. significantChangeHash * 12. status * * @param VCalendar $calendar * * @return array */ protected function parseEventInfo(VCalendar $calendar = null) { $uid = null; $organizer = null; $organizerName = null; $organizerForceSend = null; $sequence = null; $timezone = null; $status = null; $organizerScheduleAgent = 'SERVER'; $significantChangeHash = ''; // Now we need to collect a list of attendees, and which instances they // are a part of. $attendees = []; $instances = []; $exdate = []; $significantChangeEventProperties = []; foreach ($calendar->VEVENT as $vevent) { $eventSignificantChangeHash = ''; $rrule = []; if (is_null($uid)) { $uid = $vevent->UID->getValue(); } else { if ($uid !== $vevent->UID->getValue()) { throw new ITipException('If a calendar contained more than one event, they must have the same UID.'); } } if (!isset($vevent->DTSTART)) { throw new ITipException('An event MUST have a DTSTART property.'); } if (isset($vevent->ORGANIZER)) { if (is_null($organizer)) { $organizer = $vevent->ORGANIZER->getNormalizedValue(); $organizerName = isset($vevent->ORGANIZER['CN']) ? $vevent->ORGANIZER['CN'] : null; } else { if (strtoupper($organizer) !== strtoupper($vevent->ORGANIZER->getNormalizedValue())) { throw new SameOrganizerForAllComponentsException('Every instance of the event must have the same organizer.'); } } $organizerForceSend = isset($vevent->ORGANIZER['SCHEDULE-FORCE-SEND']) ? strtoupper($vevent->ORGANIZER['SCHEDULE-FORCE-SEND']) : null; $organizerScheduleAgent = isset($vevent->ORGANIZER['SCHEDULE-AGENT']) ? strtoupper((string) $vevent->ORGANIZER['SCHEDULE-AGENT']) : 'SERVER'; } if (is_null($sequence) && isset($vevent->SEQUENCE)) { $sequence = $vevent->SEQUENCE->getValue(); } if (isset($vevent->EXDATE)) { foreach ($vevent->select('EXDATE') as $val) { $exdate = array_merge($exdate, $val->getParts()); } sort($exdate); } if (isset($vevent->RRULE)) { foreach ($vevent->select('RRULE') as $rr) { foreach ($rr->getParts() as $key => $val) { // ignore default values (https://github.com/sabre-io/vobject/issues/126) if ('INTERVAL' === $key && 1 == $val) { continue; } if (is_array($val)) { $val = implode(',', $val); } $rrule[] = "$key=$val"; } } sort($rrule); } if (isset($vevent->STATUS)) { $status = strtoupper($vevent->STATUS->getValue()); } $recurId = isset($vevent->{'RECURRENCE-ID'}) ? $vevent->{'RECURRENCE-ID'}->getValue() : 'master'; if (is_null($timezone)) { if ('master' === $recurId) { $timezone = $vevent->DTSTART->getDateTime()->getTimeZone(); } else { $timezone = $vevent->{'RECURRENCE-ID'}->getDateTime()->getTimeZone(); } } if (isset($vevent->ATTENDEE)) { foreach ($vevent->ATTENDEE as $attendee) { if ($this->scheduleAgentServerRules && isset($attendee['SCHEDULE-AGENT']) && 'CLIENT' === strtoupper($attendee['SCHEDULE-AGENT']->getValue()) ) { continue; } $partStat = isset($attendee['PARTSTAT']) ? strtoupper($attendee['PARTSTAT']) : 'NEEDS-ACTION'; $forceSend = isset($attendee['SCHEDULE-FORCE-SEND']) ? strtoupper($attendee['SCHEDULE-FORCE-SEND']) : null; if (isset($attendees[$attendee->getNormalizedValue()])) { $attendees[$attendee->getNormalizedValue()]['instances'][$recurId] = [ 'id' => $recurId, 'partstat' => $partStat, 'forceSend' => $forceSend, ]; } else { $attendees[$attendee->getNormalizedValue()] = [ 'href' => $attendee->getNormalizedValue(), 'instances' => [ $recurId => [ 'id' => $recurId, 'partstat' => $partStat, ], ], 'name' => isset($attendee['CN']) ? (string) $attendee['CN'] : null, 'forceSend' => $forceSend, ]; } } $instances[$recurId] = $vevent; } foreach ($this->significantChangeProperties as $prop) { if (isset($vevent->$prop)) { $propertyValues = $vevent->select($prop); $eventSignificantChangeHash .= $prop.':'; if ('EXDATE' === $prop) { $eventSignificantChangeHash .= implode(',', $exdate).';'; } elseif ('RRULE' === $prop) { $eventSignificantChangeHash .= implode(',', $rrule).';'; } else { foreach ($propertyValues as $val) { $eventSignificantChangeHash .= $val->getValue().';'; } } } } $significantChangeEventProperties[] = $eventSignificantChangeHash; } asort($significantChangeEventProperties); foreach ($significantChangeEventProperties as $eventSignificantChangeHash) { $significantChangeHash .= $eventSignificantChangeHash; } $significantChangeHash = md5($significantChangeHash); return compact( 'uid', 'organizer', 'organizerName', 'organizerScheduleAgent', 'organizerForceSend', 'instances', 'attendees', 'sequence', 'exdate', 'timezone', 'significantChangeHash', 'status' ); } }