owncloud/core

<?php
/**
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 *
 * @copyright Copyright (c) 2018, ownCloud GmbH
 * @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 Sabre\VObject\Component;
use Sabre\VObject\Property;
use Sabre\VObject\Reader;

class CalendarObject extends \Sabre\CalDAV\CalendarObject {
    /**
     * @inheritdoc
     */
    public function get() {
        $data = parent::get();
        if ($this->isShared() && $this->objectData['classification'] === CalDavBackend::CLASSIFICATION_CONFIDENTIAL) {
            return $this->createConfidentialObject($data);
        }
        return $data;
    }

    private function isShared() {
        return isset($this->calendarInfo['{http://owncloud.org/ns}owner-principal']);
    }

    /**
     * @param string $calData
     * @return string
     */
    private static function createConfidentialObject($calData) {
        $vObject = Reader::read($calData);

        /** @var Component $vElement */
        $vElement = null;
        if (isset($vObject->VEVENT)) {
            $vElement = $vObject->VEVENT;
        }
        if (isset($vObject->VJOURNAL)) {
            $vElement = $vObject->VJOURNAL;
        }
        if (isset($vObject->VTODO)) {
            $vElement = $vObject->VTODO;
        }
        if ($vElement !== null) {
            /* @phan-suppress-next-line PhanUndeclaredMethod */
            foreach ($vElement->children() as &$property) {
                /** @var Property $property */
                switch ($property->name) {
                    case 'CREATED':
                    case 'DTSTART':
                    case 'RRULE':
                    case 'DURATION':
                    case 'DTEND':
                    case 'CLASS':
                    case 'UID':
                        break;
                    case 'SUMMARY':
                        $property->setValue('Busy');
                        break;
                    default:
                        /* @phan-suppress-next-line PhanUndeclaredMethod */
                        $vElement->__unset($property->name);
                        unset($property);
                        break;
                }
            }
        }

        return $vObject->serialize();
    }
}