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460d63772b
This is clearly the original intent, the parameter name in ViewOnly is $userFolder, and the similar event for single file download uses paths relative to user folder as well. Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>
99 lines
2.3 KiB
PHP
99 lines
2.3 KiB
PHP
<?php
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/**
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* SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
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* SPDX-FileCopyrightText: 2019 ownCloud GmbH
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* SPDX-License-Identifier: AGPL-3.0-only
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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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public function __construct(
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private Folder $userFolder,
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) {
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}
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/**
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* @param string[] $pathsToCheck paths to check, relative to the user folder
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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 SharedStorage $storage */
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$share = $storage->getShare();
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// Check whether download-permission was denied (granted if not set)
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$attributes = $share->getAttributes();
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$canDownload = $attributes?->getAttribute('permissions', 'download');
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return $canDownload !== false;
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}
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}
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