nextcloud-server/apps/dav/lib/CalDAV/CalendarRoot.php

<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Christoph Wurst <christoph@winzerhof-wurst.at>
 * @author Georg Ehrke <oc.list@georgehrke.com>
 * @author Lukas Reschke <lukas@statuscode.ch>
 * @author Roeland Jago Douma <roeland@famdouma.nl>
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 *
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program. If not, see <http://www.gnu.org/licenses/>
 *
 */
namespace OCA\DAV\CalDAV;

use Psr\Log\LoggerInterface;
use Sabre\CalDAV\Backend;
use Sabre\DAVACL\PrincipalBackend;

class CalendarRoot extends \Sabre\CalDAV\CalendarRoot {
	private LoggerInterface $logger;

	private array $returnCachedSubscriptions = [];

	public function __construct(
		PrincipalBackend\BackendInterface $principalBackend,
		Backend\BackendInterface $caldavBackend,
		$principalPrefix,
		LoggerInterface $logger
	) {
		parent::__construct($principalBackend, $caldavBackend, $principalPrefix);
		$this->logger = $logger;
	}

	public function getChildForPrincipal(array $principal) {
		return new CalendarHome(
			$this->caldavBackend,
			$principal,
			$this->logger,
			array_key_exists($principal['uri'], $this->returnCachedSubscriptions)
		);
	}

	public function getName() {
		if ($this->principalPrefix === 'principals/calendar-resources' ||
			$this->principalPrefix === 'principals/calendar-rooms') {
			$parts = explode('/', $this->principalPrefix);

			return $parts[1];
		}

		return parent::getName();
	}

	public function enableReturnCachedSubscriptions(string $principalUri): void {
		$this->returnCachedSubscriptions['principals/users/' . $principalUri] = true;
	}
}