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109 lines
3.2 KiB
PHP
109 lines
3.2 KiB
PHP
<?php
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/**
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* @author Piotr Mrowczynski piotr@owncloud.com
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*
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* @copyright Copyright (c) 2019, ownCloud GmbH
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OCA\DAV\DAV;
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use OCA\DAV\Connector\Sabre\Exception\Forbidden;
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use OCA\DAV\Connector\Sabre\File as DavFile;
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use OCA\Files_Versions\Sabre\VersionFile;
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use OCP\Files\NotFoundException;
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use Psr\Log\LoggerInterface;
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use Sabre\DAV\Server;
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use Sabre\DAV\ServerPlugin;
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use Sabre\HTTP\RequestInterface;
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use Sabre\DAV\Exception\NotFound;
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/**
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* Sabre plugin for restricting file share receiver download:
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*/
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class ViewOnlyPlugin extends ServerPlugin {
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private ?Server $server = null;
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private LoggerInterface $logger;
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public function __construct(LoggerInterface $logger) {
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$this->logger = $logger;
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}
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/**
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* This initializes the plugin.
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*
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* This function is called by Sabre\DAV\Server, after
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* addPlugin is called.
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*
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* This method should set up the required event subscriptions.
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*/
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public function initialize(Server $server): void {
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$this->server = $server;
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//priority 90 to make sure the plugin is called before
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//Sabre\DAV\CorePlugin::httpGet
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$this->server->on('method:GET', [$this, 'checkViewOnly'], 90);
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$this->server->on('method:COPY', [$this, 'checkViewOnly'], 90);
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}
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/**
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* Disallow download via DAV Api in case file being received share
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* and having special permission
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*
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* @throws Forbidden
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* @throws NotFoundException
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*/
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public function checkViewOnly(RequestInterface $request): bool {
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$path = $request->getPath();
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try {
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assert($this->server !== null);
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$davNode = $this->server->tree->getNodeForPath($path);
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if ($davNode instanceof DavFile) {
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// Restrict view-only to nodes which are shared
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$node = $davNode->getNode();
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} else if ($davNode instanceof VersionFile) {
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$node = $davNode->getVersion()->getSourceFile();
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} else {
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return true;
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}
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$storage = $node->getStorage();
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if (!$storage->instanceOfStorage(\OCA\Files_Sharing\SharedStorage::class)) {
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return true;
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}
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// Extract extra permissions
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/** @var \OCA\Files_Sharing\SharedStorage $storage */
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$share = $storage->getShare();
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$attributes = $share->getAttributes();
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if ($attributes === null) {
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return true;
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}
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// Check if read-only and on whether permission can download is both set and disabled.
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$canDownload = $attributes->getAttribute('permissions', 'download');
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if ($canDownload !== null && !$canDownload) {
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throw new Forbidden('Access to this resource has been denied because it is in view-only mode.');
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}
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} catch (NotFound $e) {
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// File not found
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}
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return true;
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}
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}
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