402 lines
12 KiB
PHP
402 lines
12 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* @copyright Copyright (c) 2023 Varun Patil <radialapps@gmail.com>
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* @author Varun Patil <radialapps@gmail.com>
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* @license AGPL-3.0-or-later
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*
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* This program 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 as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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namespace OCA\Memories\Db;
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use OC\Files\Search\SearchComparison;
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use OC\Files\Search\SearchQuery;
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use OCA\Memories\Exceptions;
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use OCA\Memories\Util;
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use OCP\Files\File;
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use OCP\Files\Folder;
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use OCP\Files\IRootFolder;
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use OCP\Files\Node;
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use OCP\Files\Search\ISearchComparison;
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use OCP\ICache;
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use OCP\ICacheFactory;
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use OCP\IConfig;
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use OCP\IRequest;
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use OCP\IUserManager;
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use OCP\IUserSession;
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use OCP\Share\IShare;
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class FsManager
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{
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protected IConfig $config;
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protected IUserSession $userSession;
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protected IRootFolder $rootFolder;
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protected AlbumsQuery $albumsQuery;
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protected IRequest $request;
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protected ICache $nomediaCache;
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public function __construct(
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IConfig $config,
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IUserSession $userSession,
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IRootFolder $rootFolder,
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AlbumsQuery $albumsQuery,
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IRequest $request,
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ICacheFactory $cacheFactory
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) {
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$this->config = $config;
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$this->userSession = $userSession;
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$this->rootFolder = $rootFolder;
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$this->albumsQuery = $albumsQuery;
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$this->request = $request;
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$this->nomediaCache = $cacheFactory->createLocal('memories:nomedia');
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}
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/** Get the TimelineRoot object relevant to the request */
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public function populateRoot(TimelineRoot &$root)
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{
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$user = $this->userSession->getUser();
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// Albums have no folder
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if ($this->request->getParam('albums') && Util::albumsIsEnabled()) {
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if (null !== $user) {
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return $root;
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}
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if (($token = $this->getShareToken()) && $this->albumsQuery->getAlbumByLink($token)) {
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return $root;
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}
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}
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// Public shared folder
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if ($share = $this->getShareNode()) { // can throw
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if (!$share instanceof Folder) {
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throw new \Exception('Share is not a folder');
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}
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$root->addFolder($share);
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return $root;
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}
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// Anything else needs a user
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if (null === $user) {
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throw Exceptions::NotLoggedIn();
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}
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$uid = $user->getUID();
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$folder = null;
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$folderPath = $this->request->getParam('folder');
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$userFolder = $this->rootFolder->getUserFolder($uid);
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try {
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if (null !== $folderPath) {
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$folder = $userFolder->get(Util::sanitizePath($folderPath));
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$root->addFolder($folder);
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} else {
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// Get timeline paths
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$paths = Util::getTimelinePaths($uid);
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if ($path = $this->request->getParam('timelinePath', null)) {
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$paths = [Util::sanitizePath($path)];
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}
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// Combined etag, for cache invalidation.
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// This is cheaper and more sensible than the root etag.
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// The only time this breaks down is if the user places a .nomedia
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// outside the timeline path; rely on expiration for that.
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$etag = $uid;
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// Multiple timeline path support
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foreach ($paths as $path) {
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$node = $userFolder->get($path);
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$root->addFolder($node);
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$etag .= $node->getEtag();
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}
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// Add shares or external stores inside the current folders
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$root->addMountPoints();
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// Exclude .nomedia folders
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$root->excludePaths($this->getNoMediaFolders($userFolder, md5($etag)));
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}
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} catch (\OCP\Files\NotFoundException $e) {
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$msg = $e->getMessage();
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throw new \Exception("Folder not found: {$msg}");
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}
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return $root;
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}
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/**
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* Get list of folders with .nomedia file.
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*
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* @param Folder $root root folder
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* @param string $key cache key
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*/
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public function getNoMediaFolders(Folder $root, string $key): array
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{
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if (null !== ($paths = $this->nomediaCache->get($key))) {
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return $paths;
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}
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$comp = new SearchComparison(ISearchComparison::COMPARE_EQUAL, 'name', '.nomedia');
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$search = $root->search(new SearchQuery($comp, 0, 0, [], Util::getUser()));
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$paths = array_map(fn (Node $node) => \dirname($node->getPath()), $search);
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$this->nomediaCache->set($key, $paths, 60 * 60); // 1 hour
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return $paths;
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}
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/**
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* Get a file with ID for the current user.
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*
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* @throws Exceptions\NotFoundFile
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*/
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public function getUserFile(int $fileId): File
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{
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$file = $this->getUserFileOrNull($fileId);
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if (null === $file) {
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throw Exceptions::NotFoundFile($fileId);
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}
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return $file;
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}
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/**
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* Get a file with ID for the current user.
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*/
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public function getUserFileOrNull(int $fileId): ?File
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{
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// Don't check self for share token
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if ($this->getShareToken()) {
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return $this->getShareFile($fileId);
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}
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// Check both user folder and album
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return $this->getUserFolderFile($fileId) ??
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$this->getAlbumFile($fileId);
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}
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/**
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* Get a file with ID from user's folder.
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*/
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public function getUserFolderFile(int $id): ?File
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{
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$user = $this->userSession->getUser();
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if (null === $user) {
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return null;
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}
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$userFolder = $this->rootFolder->getUserFolder($user->getUID());
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// No need to force permissions when reading
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// from the user's own folder. This includes shared
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// folders and files from other users.
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return $this->getOneFileFromFolder($userFolder, $id);
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}
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/**
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* Get a file with ID from an album.
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*
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* @param int $id FileID
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*/
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public function getAlbumFile(int $id): ?File
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{
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$user = $this->userSession->getUser();
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if (null === $user) {
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return null;
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}
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$uid = $user->getUID();
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$owner = $this->albumsQuery->userHasFile($uid, $id);
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if (!$owner) {
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return null;
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}
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$folder = $this->rootFolder->getUserFolder($owner);
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// Album files are always read-only
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// Note that albums have lowest priority, so it means the
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// user doesn't have access to the file in their own folder.
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return $this->getOneFileFromFolder($folder, $id, \OCP\Constants::PERMISSION_READ);
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}
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/**
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* Get a file with ID from a public share.
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*
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* @param int $id FileID
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*/
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public function getShareFile(int $id): ?File
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{
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try {
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// Album share
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if ($this->request->getParam('albums')) {
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$album = $this->albumsQuery->getAlbumByLink($this->getShareToken());
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if (null === $album) {
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return null;
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}
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$owner = $this->albumsQuery->hasFile((int) $album['album_id'], $id);
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if (!$owner) {
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return null;
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}
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$folder = $this->rootFolder->getUserFolder($owner);
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// Public albums are always read-only
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return $this->getOneFileFromFolder($folder, $id, \OCP\Constants::PERMISSION_READ);
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}
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// Folder share
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if ($share = $this->getShareNode()) {
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// Public shares may allow editing
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// Just use the same permissions as the share
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if ($share instanceof File) {
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return $share;
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}
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if ($share instanceof Folder) {
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return $this->getOneFileFromFolder($share, $id, $share->getPermissions());
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}
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return null;
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}
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} catch (\Exception $e) {
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}
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return null;
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}
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public function getShareObject()
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{
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// Get token from request
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$token = $this->getShareToken();
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if (null === $token) {
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return null;
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}
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// Get share by token
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$share = \OC::$server->get(\OCP\Share\IManager::class)->getShareByToken($token);
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if (!self::validateShare($share)) {
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return null;
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}
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// Check if share is password protected
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if (($password = $share->getPassword()) !== null) {
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$session = \OC::$server->get(\OCP\ISession::class);
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// https://github.com/nextcloud/server/blob/0447b53bda9fe95ea0cbed765aa332584605d652/lib/public/AppFramework/PublicShareController.php#L119
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if (
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$session->get('public_link_authenticated_token') !== $token
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|| $session->get('public_link_authenticated_password_hash') !== $password
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) {
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throw new \Exception('Share is password protected and user is not authenticated');
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}
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}
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return $share;
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}
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public function getShareNode()
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{
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$share = $this->getShareObject();
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if (null === $share) {
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return null;
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}
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// Get node from share
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$node = $share->getNode(); // throws exception if not found
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if (!$node->isReadable() || !$node->isShareable()) {
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throw new \Exception('Share not found or invalid');
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}
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// Force permissions from the share onto the node
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Util::forcePermissions($node, $share->getPermissions());
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return $node;
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}
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/**
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* Validate the permissions of the share.
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*/
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public static function validateShare(?IShare $share): bool
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{
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if (null === $share) {
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return false;
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}
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// Get user manager
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$userManager = \OC::$server->get(IUserManager::class);
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// Check if share read is allowed
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if (!($share->getPermissions() & \OCP\Constants::PERMISSION_READ)) {
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return false;
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}
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// If the owner is disabled no access to the linke is granted
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$owner = $userManager->get($share->getShareOwner());
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if (null === $owner || !$owner->isEnabled()) {
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return false;
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}
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// If the initiator of the share is disabled no access is granted
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$initiator = $userManager->get($share->getSharedBy());
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if (null === $initiator || !$initiator->isEnabled()) {
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return false;
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}
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return $share->getNode()->isReadable() && $share->getNode()->isShareable();
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}
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/**
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* Helper to get one file or null from a fiolder.
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*
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* @param Folder $folder Folder to search in
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* @param int $id Id of the file
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* @param int $perm Permissions to force on the file
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*/
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private function getOneFileFromFolder(Folder $folder, int $id, int $perm = -1): ?File
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{
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// Check for permissions and get numeric Id
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$file = $folder->getById($id);
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if (0 === \count($file)) {
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return null;
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}
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$file = $file[0];
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// Check if node is a file
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if (!$file instanceof File) {
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return null;
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}
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// Check read permission
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if (!$file->isReadable()) {
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return null;
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}
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// Force file permissions if required
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if ($perm >= 0) {
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Util::forcePermissions($file, $perm);
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}
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return $file;
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}
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private function getShareToken()
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{
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return $this->request->getParam('token');
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}
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}
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