mirror of
https://github.com/nextcloud/server.git
synced 2025-05-02 13:00:42 +00:00
108 lines
2.5 KiB
PHP
108 lines
2.5 KiB
PHP
<?php
|
|
|
|
/**
|
|
* SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
|
|
* SPDX-FileCopyrightText: 2019 ownCloud GmbH
|
|
* SPDX-License-Identifier: AGPL-3.0-only
|
|
*/
|
|
|
|
namespace OCA\Files_Sharing;
|
|
|
|
use OCP\Files\File;
|
|
use OCP\Files\Folder;
|
|
use OCP\Files\Node;
|
|
use OCP\Files\NotFoundException;
|
|
|
|
/**
|
|
* Handles restricting for download of files
|
|
*/
|
|
class ViewOnly {
|
|
|
|
/** @var Folder */
|
|
private $userFolder;
|
|
|
|
public function __construct(Folder $userFolder) {
|
|
$this->userFolder = $userFolder;
|
|
}
|
|
|
|
/**
|
|
* @param string[] $pathsToCheck
|
|
* @return bool
|
|
*/
|
|
public function check(array $pathsToCheck): bool {
|
|
// If any of elements cannot be downloaded, prevent whole download
|
|
foreach ($pathsToCheck as $file) {
|
|
try {
|
|
$info = $this->userFolder->get($file);
|
|
if ($info instanceof File) {
|
|
// access to filecache is expensive in the loop
|
|
if (!$this->checkFileInfo($info)) {
|
|
return false;
|
|
}
|
|
} elseif ($info instanceof Folder) {
|
|
// get directory content is rather cheap query
|
|
if (!$this->dirRecursiveCheck($info)) {
|
|
return false;
|
|
}
|
|
}
|
|
} catch (NotFoundException $e) {
|
|
continue;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @param Folder $dirInfo
|
|
* @return bool
|
|
* @throws NotFoundException
|
|
*/
|
|
private function dirRecursiveCheck(Folder $dirInfo): bool {
|
|
if (!$this->checkFileInfo($dirInfo)) {
|
|
return false;
|
|
}
|
|
// If any of elements cannot be downloaded, prevent whole download
|
|
$files = $dirInfo->getDirectoryListing();
|
|
foreach ($files as $file) {
|
|
if ($file instanceof File) {
|
|
if (!$this->checkFileInfo($file)) {
|
|
return false;
|
|
}
|
|
} elseif ($file instanceof Folder) {
|
|
return $this->dirRecursiveCheck($file);
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @param Node $fileInfo
|
|
* @return bool
|
|
* @throws NotFoundException
|
|
*/
|
|
private function checkFileInfo(Node $fileInfo): bool {
|
|
// Restrict view-only to nodes which are shared
|
|
$storage = $fileInfo->getStorage();
|
|
if (!$storage->instanceOfStorage(SharedStorage::class)) {
|
|
return true;
|
|
}
|
|
|
|
// Extract extra permissions
|
|
/** @var \OCA\Files_Sharing\SharedStorage $storage */
|
|
$share = $storage->getShare();
|
|
|
|
$canDownload = true;
|
|
|
|
// Check if read-only and on whether permission can download is both set and disabled.
|
|
$attributes = $share->getAttributes();
|
|
if ($attributes !== null) {
|
|
$canDownload = $attributes->getAttribute('permissions', 'download');
|
|
}
|
|
|
|
if ($canDownload !== null && !$canDownload) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
}
|