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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OCA\DAV\CalDAV;
use OCA\DAV\CalDAV\Schedule\IMipService;
use Sabre\VObject\Component\VCalendar;
use Sabre\VObject\Component\VEvent;
class EventComparisonService {
/** @var string[] */
private const EVENT_DIFF = [
'RECURRENCE-ID',
'RRULE',
'SEQUENCE',
'LAST-MODIFIED'
];
/**
* If found, remove the event from $eventsToFilter that
* is identical to the passed $filterEvent
* and return whether an identical event was found
*
* This function takes into account the SEQUENCE,
* RRULE, RECURRENCE-ID and LAST-MODIFIED parameters
*
* @param VEvent $filterEvent
* @param array $eventsToFilter
* @return bool true if there was an identical event found and removed, false if there wasn't
*/
private function removeIfUnchanged(VEvent $filterEvent, array &$eventsToFilter): bool {
$filterEventData = [];
foreach(self::EVENT_DIFF as $eventDiff) {
$filterEventData[] = IMipService::readPropertyWithDefault($filterEvent, $eventDiff, '');
}
/** @var VEvent $component */
foreach ($eventsToFilter as $k => $eventToFilter) {
$eventToFilterData = [];
foreach(self::EVENT_DIFF as $eventDiff) {
$eventToFilterData[] = IMipService::readPropertyWithDefault($eventToFilter, $eventDiff, '');
}
// events are identical and can be removed
if ($filterEventData === $eventToFilterData) {
unset($eventsToFilter[$k]);
return true;
}
}
return false;
}
/**
* Compare two VCalendars with each other and find all changed elements
*
* Returns an array of old and new events
*
* Old events are only detected if they are also changed
* If there is no corresponding old event for a VEvent, it
* has been newly created
*
* @param VCalendar $new
* @param VCalendar|null $old
* @return array<string, VEvent[]|null>
*/
public function findModified(VCalendar $new, ?VCalendar $old): array {
$newEventComponents = $new->getComponents();
foreach ($newEventComponents as $k => $event) {
if(!$event instanceof VEvent) {
unset($newEventComponents[$k]);
}
}
if(empty($old)) {
return ['old' => null, 'new' => $newEventComponents];
}
$oldEventComponents = $old->getComponents();
if(is_array($oldEventComponents) && !empty($oldEventComponents)) {
foreach ($oldEventComponents as $k => $event) {
if(!$event instanceof VEvent) {
unset($oldEventComponents[$k]);
continue;
}
if($this->removeIfUnchanged($event, $newEventComponents)) {
unset($oldEventComponents[$k]);
}
}
}
return ['old' => array_values($oldEventComponents), 'new' => array_values($newEventComponents)];
}
}
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