<?php
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC\Encryption;
use OCA\Files_External\Service\GlobalStoragesService;
use OCP\App\IAppManager;
use OCP\Cache\CappedMemoryCache;
use OCP\Files\IRootFolder;
use OCP\Files\NotFoundException;
use OCP\Share\IManager;
class File implements \OCP\Encryption\IFile {
protected Util $util;
private IRootFolder $rootFolder;
private IManager $shareManager;
/**
* Cache results of already checked folders
* @var CappedMemoryCache<array>
*/
protected CappedMemoryCache $cache;
private ?IAppManager $appManager = null;
public function __construct(Util $util,
IRootFolder $rootFolder,
IManager $shareManager) {
$this->util = $util;
$this->cache = new CappedMemoryCache();
$this->rootFolder = $rootFolder;
$this->shareManager = $shareManager;
}
public function getAppManager(): IAppManager {
// Lazy evaluate app manager as it initialize the db too early otherwise
if ($this->appManager) {
return $this->appManager;
}
$this->appManager = \OCP\Server::get(IAppManager::class);
return $this->appManager;
}
/**
* Get list of users with access to the file
*
* @param string $path to the file
* @return array{users: string[], public: bool}
*/
public function getAccessList($path) {
// Make sure that a share key is generated for the owner too
[$owner, $ownerPath] = $this->util->getUidAndFilename($path);
// always add owner to the list of users with access to the file
$userIds = [$owner];
if (!$this->util->isFile($owner . '/' . $ownerPath)) {
return ['users' => $userIds, 'public' => false];
}
$ownerPath = substr($ownerPath, strlen('/files'));
$userFolder = $this->rootFolder->getUserFolder($owner);
try {
$file = $userFolder->get($ownerPath);
} catch (NotFoundException $e) {
$file = null;
}
$ownerPath = $this->util->stripPartialFileExtension($ownerPath);
// first get the shares for the parent and cache the result so that we don't
// need to check all parents for every file
$parent = dirname($ownerPath);
$parentNode = $userFolder->get($parent);
if (isset($this->cache[$parent])) {
$resultForParents = $this->cache[$parent];
} else {
$resultForParents = $this->shareManager->getAccessList($parentNode);
$this->cache[$parent] = $resultForParents;
}
$userIds = array_merge($userIds, $resultForParents['users']);
$public = $resultForParents['public'] || $resultForParents['remote'];
// Find out who, if anyone, is sharing the file
if ($file !== null) {
$resultForFile = $this->shareManager->getAccessList($file, false);
$userIds = array_merge($userIds, $resultForFile['users']);
$public = $resultForFile['public'] || $resultForFile['remote'] || $public;
}
// check if it is a group mount
if ($this->getAppManager()->isEnabledForUser('files_external')) {
/** @var GlobalStoragesService $storageService */
$storageService = \OC::$server->get(GlobalStoragesService::class);
$storages = $storageService->getAllStorages();
foreach ($storages as $storage) {
if ($storage->getMountPoint() == substr($ownerPath, 0, strlen($storage->getMountPoint()))) {
$mountedFor = $this->util->getUserWithAccessToMountPoint($storage->getApplicableUsers(), $storage->getApplicableGroups());
$userIds = array_merge($userIds, $mountedFor);
}
}
}
// Remove duplicate UIDs
$uniqueUserIds = array_unique($userIds);
return ['users' => $uniqueUserIds, 'public' => $public];
}
}