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<?php |
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declare(strict_types=1); |
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/** |
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* @copyright 2022 Anna Larch <[email protected]> |
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* |
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* @author 2022 Anna Larch <[email protected]> |
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* |
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* @license GNU AGPL version 3 or any later version |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License as |
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* published by the Free Software Foundation, either version 3 of the |
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* License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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* |
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*/ |
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namespace OCA\DAV\CalDAV; |
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use OCA\DAV\AppInfo\Application; |
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use OCA\DAV\CalDAV\Schedule\IMipService; |
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use OCP\AppFramework\Utility\ITimeFactory; |
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use OCP\IConfig; |
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use Sabre\VObject\Component\VCalendar; |
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use Sabre\VObject\Component\VEvent; |
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use Sabre\VObject\Component\VTimeZone; |
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use Sabre\VObject\Component\VTodo; |
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use function max; |
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class EventComparisonService { |
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/** @var string[] */ |
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private const EVENT_DIFF = [ |
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'RECURRENCE-ID', |
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'RRULE', |
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'SEQUENCE', |
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'LAST-MODIFIED' |
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]; |
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/** |
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* If found, remove the event from $eventsToFilter that |
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* is identical to the passed $filterEvent |
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* and return whether an identical event was found |
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* |
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* This function takes into account the SEQUENCE, |
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* RRULE, RECURRENCE-ID and LAST-MODIFIED parameters |
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* |
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* @param VEvent $filterEvent |
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* @param array $eventsToFilter |
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* @return bool true if there was an identical event found and removed, false if there wasn't |
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*/ |
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private function removeIfUnchanged(VEvent $filterEvent, array &$eventsToFilter): bool { |
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$filterEventData = []; |
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foreach(self::EVENT_DIFF as $eventDiff) { |
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$filterEventData[] = IMipService::readPropertyWithDefault($filterEvent, $eventDiff, ''); |
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} |
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/** @var VEvent $component */ |
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foreach ($eventsToFilter as $k => $eventToFilter) { |
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$eventToFilterData = []; |
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foreach(self::EVENT_DIFF as $eventDiff) { |
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$eventToFilterData[] = IMipService::readPropertyWithDefault($eventToFilter, $eventDiff, ''); |
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} |
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// events are identical and can be removed |
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if (empty(array_diff($filterEventData, $eventToFilterData))) { |
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unset($eventsToFilter[$k]); |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Compare two VCalendars with each other and find all changed elements |
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* |
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* Returns an array of old and new events |
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* |
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* Old events are only detected if they are also changed |
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* If there is no corresponding old event for a VEvent, it |
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* has been newly created |
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* |
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* @param VCalendar $new |
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* @param VCalendar|null $old |
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* @return array<string, VEvent[]> |
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*/ |
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public function findModified(VCalendar $new, ?VCalendar $old): array { |
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$newEventComponents = $new->getComponents(); |
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foreach ($newEventComponents as $k => $event) { |
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if(!$event instanceof VEvent) { |
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unset($newEventComponents[$k]); |
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} |
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} |
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if(empty($old)) { |
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return ['old' => null, 'new' => $newEventComponents]; |
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} |
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$oldEventComponents = $old->getComponents(); |
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if(is_array($oldEventComponents) && !empty($oldEventComponents)) { |
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foreach ($oldEventComponents as $k => $event) { |
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if(!$event instanceof VEvent) { |
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unset($oldEventComponents[$k]); |
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continue; |
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} |
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if($this->removeIfUnchanged($event, $newEventComponents)) { |
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unset($oldEventComponents[$k]); |
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} |
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} |
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} |
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return ['old' => array_values($oldEventComponents), 'new' => array_values($newEventComponents)]; |
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} |
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} |
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nextcloud /
server
