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<?php
declare(strict_types=1);
/**
* @copyright 2018 Georg Ehrke <oc.list@georgehrke.com>
*
* @author Georg Ehrke <oc.list@georgehrke.com>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\DAV\CalDAV\WebcalCaching;
use OCA\DAV\CalDAV\CalendarHome;
use OCP\IRequest;
use Sabre\DAV\Exception\NotFound;
use Sabre\DAV\Server;
use Sabre\DAV\ServerPlugin;
use Sabre\HTTP\RequestInterface;
use Sabre\HTTP\ResponseInterface;
class Plugin extends ServerPlugin {
/**
* list of regular expressions for calendar user agents,
* that do not support subscriptions on their own
*
* @var string[]
*/
const ENABLE_FOR_CLIENTS = [];
/**
* @var bool
*/
private $enabled=false;
/**
* @var Server
*/
private $server;
/**
* Plugin constructor.
*
* @param IRequest $request
*/
public function __construct(IRequest $request) {
if ($request->isUserAgent(self::ENABLE_FOR_CLIENTS)) {
$this->enabled = true;
}
$magicHeader = $request->getHeader('X-NC-CalDAV-Webcal-Caching');
if ($magicHeader === 'On') {
$this->enabled = true;
}
}
/**
* This initializes the plugin.
*
* This function is called by Sabre\DAV\Server, after
* addPlugin is called.
*
* This method should set up the required event subscriptions.
*
* @param Server $server
*/
public function initialize(Server $server) {
$this->server = $server;
$server->on('beforeMethod', [$this, 'beforeMethod']);
}
/**
* @param RequestInterface $request
* @param ResponseInterface $response
*/
public function beforeMethod(RequestInterface $request, ResponseInterface $response) {
if (!$this->enabled) {
return;
}
$path = $request->getPath();
$pathParts = explode('/', ltrim($path, '/'));
if (\count($pathParts) < 2) {
return;
}
// $calendarHomePath will look like: calendars/username
$calendarHomePath = $pathParts[0] . '/' . $pathParts[1];
try {
$calendarHome = $this->server->tree->getNodeForPath($calendarHomePath);
if (!($calendarHome instanceof CalendarHome)) {
//how did we end up here?
return;
}
$calendarHome->enableCachedSubscriptionsForThisRequest();
} catch(NotFound $ex) {
return;
}
}
/**
* @return bool
*/
public function isCachingEnabledForThisRequest():bool {
return $this->enabled;
}
/**
* This method should return a list of server-features.
*
* This is for example 'versioning' and is added to the DAV: header
* in an OPTIONS response.
*
* @return string[]
*/
public function getFeatures():array {
return ['nc-calendar-webcal-cache'];
}
/**
* Returns a plugin name.
*
* Using this name other plugins will be able to access other plugins
* using Sabre\DAV\Server::getPlugin
*
* @return string
*/
public function getPluginName():string {
return 'nc-calendar-webcal-cache';
}
}