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<?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;
}
}
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