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109 lines
2.7 KiB
PHP
109 lines
2.7 KiB
PHP
<?php
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/**
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* SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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namespace OCA\DAV\CalDAV\Integration;
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use Sabre\CalDAV;
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use Sabre\DAV;
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/**
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* Class ExternalCalendar
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*
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* @package OCA\DAV\CalDAV\Integration
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* @since 19.0.0
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*/
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abstract class ExternalCalendar implements CalDAV\ICalendar, DAV\IProperties {
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/** @var string */
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private const PREFIX = 'app-generated';
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/**
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* @var string
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*
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* Double dash is a valid delimiter,
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* because it will always split the calendarURIs correctly:
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* - our prefix contains only one dash and won't be split
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* - appIds are not allowed to contain dashes as per spec:
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* > must contain only lowercase ASCII characters and underscore
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* - explode has a limit of three, so even if the app-generated
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* calendar uri has double dashes, it won't be split
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*/
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private const DELIMITER = '--';
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/**
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* ExternalCalendar constructor.
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*
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* @param string $appId
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* @param string $calendarUri
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*/
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public function __construct(
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private string $appId,
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private string $calendarUri,
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) {
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}
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/**
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* @inheritDoc
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*/
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final public function getName() {
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return implode(self::DELIMITER, [
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self::PREFIX,
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$this->appId,
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$this->calendarUri,
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]);
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}
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/**
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* @inheritDoc
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*/
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final public function setName($name) {
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throw new DAV\Exception\MethodNotAllowed('Renaming calendars is not yet supported');
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}
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/**
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* @inheritDoc
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*/
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final public function createDirectory($name) {
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throw new DAV\Exception\MethodNotAllowed('Creating collections in calendar objects is not allowed');
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}
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/**
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* Checks whether the calendar uri is app-generated
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*
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* @param string $calendarUri
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* @return bool
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*/
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public static function isAppGeneratedCalendar(string $calendarUri):bool {
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return str_starts_with($calendarUri, self::PREFIX) && substr_count($calendarUri, self::DELIMITER) >= 2;
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}
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/**
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* Splits an app-generated calendar-uri into appId and calendarUri
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*
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* @param string $calendarUri
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* @return array
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*/
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public static function splitAppGeneratedCalendarUri(string $calendarUri):array {
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$array = array_slice(explode(self::DELIMITER, $calendarUri, 3), 1);
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// Check the array has expected amount of elements
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// and none of them is an empty string
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if (\count($array) !== 2 || \in_array('', $array, true)) {
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throw new \InvalidArgumentException('Provided calendar uri was not app-generated');
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}
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return $array;
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}
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/**
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* Checks whether a calendar-name, the user wants to create, violates
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* the reserved name for calendar uris
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*
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* @param string $calendarUri
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* @return bool
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*/
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public static function doesViolateReservedName(string $calendarUri):bool {
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return str_starts_with($calendarUri, self::PREFIX);
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}
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}
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