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121 lines
3 KiB
PHP
121 lines
3 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\Files_Sharing;
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use OCP\Files\File;
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use OCP\Files\Folder;
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use OCP\Files\Node;
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use OCP\Files\NotFoundException;
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/**
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* Handles restricting for download of files
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*/
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class ViewOnly {
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/** @var Folder */
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private $userFolder;
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public function __construct(Folder $userFolder) {
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$this->userFolder = $userFolder;
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}
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/**
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* @param string[] $pathsToCheck
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* @return bool
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*/
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public function check(array $pathsToCheck): bool {
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// If any of elements cannot be downloaded, prevent whole download
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foreach ($pathsToCheck as $file) {
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try {
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$info = $this->userFolder->get($file);
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if ($info instanceof File) {
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// access to filecache is expensive in the loop
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if (!$this->checkFileInfo($info)) {
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return false;
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}
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} elseif ($info instanceof Folder) {
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// get directory content is rather cheap query
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if (!$this->dirRecursiveCheck($info)) {
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return false;
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}
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}
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} catch (NotFoundException $e) {
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continue;
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}
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}
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return true;
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}
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/**
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* @param Folder $dirInfo
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* @return bool
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* @throws NotFoundException
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*/
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private function dirRecursiveCheck(Folder $dirInfo): bool {
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if (!$this->checkFileInfo($dirInfo)) {
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return false;
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}
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// If any of elements cannot be downloaded, prevent whole download
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$files = $dirInfo->getDirectoryListing();
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foreach ($files as $file) {
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if ($file instanceof File) {
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if (!$this->checkFileInfo($file)) {
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return false;
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}
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} elseif ($file instanceof Folder) {
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return $this->dirRecursiveCheck($file);
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}
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}
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return true;
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}
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/**
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* @param Node $fileInfo
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* @return bool
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* @throws NotFoundException
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*/
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private function checkFileInfo(Node $fileInfo): bool {
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// Restrict view-only to nodes which are shared
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$storage = $fileInfo->getStorage();
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if (!$storage->instanceOfStorage(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 = $storage->getShare();
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$canDownload = true;
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// Check if read-only and on whether permission can download is both set and disabled.
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$attributes = $share->getAttributes();
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if ($attributes !== null) {
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$canDownload = $attributes->getAttribute('permissions', 'download');
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}
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if ($canDownload !== null && !$canDownload) {
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return false;
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}
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return true;
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}
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}
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