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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2022 Julius Härtl <jus@bitgrid.net>
*
* @author Julius Härtl <jus@bitgrid.net>
*
* @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\Richdocuments\Listener;
use OCA\Files_Sharing\SharedStorage;
use OCA\Richdocuments\PermissionManager;
use OCP\EventDispatcher\Event;
use OCP\EventDispatcher\IEventListener;
use OCP\Files\NotFoundException;
use OCP\IRequest;
use OCP\IUserSession;
use OCP\Preview\BeforePreviewFetchedEvent;
use OCP\Share\Exceptions\ShareNotFound;
use OCP\Share\IManager;
use OCP\Share\IShare;
class BeforeFetchPreviewListener implements IEventListener {
private PermissionManager $permissionManager;
private IUserSession $userSession;
private IRequest $request;
private IManager $shareManager;
public function __construct(PermissionManager $permissionManager, IUserSession $userSession, IRequest $request, IManager $shareManager) {
$this->permissionManager = $permissionManager;
$this->userSession = $userSession;
$this->request = $request;
$this->shareManager = $shareManager;
}
public function handle(Event $event): void {
if (!$event instanceof BeforePreviewFetchedEvent) {
return;
}
$shareToken = $this->request->getParam('token');
$share = null;
// Get share for internal shares
$storage = $event->getNode()->getStorage();
if (!$shareToken && $storage->instanceOfStorage(SharedStorage::class)) {
if (method_exists(IShare::class, 'getAttributes')) {
/** @var SharedStorage $storage */
$share = $storage->getShare();
}
}
// Get different share for public previews as the share from the node is only set for mounted shares
try {
$share = $shareToken ? $this->shareManager->getShareByToken($shareToken) : $share;
} catch (ShareNotFound $e) {
}
$userId = $this->userSession->getUser() ? $this->userSession->getUser()->getUID() : null;
if ($this->permissionManager->shouldWatermark($event->getNode(), $userId, $share)) {
throw new NotFoundException();
}
}
}
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