memories/lib/Controller/GenericApiControllerFs.php

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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2023 Varun Patil <radialapps@gmail.com>
* @author Varun Patil <radialapps@gmail.com>
* @license AGPL-3.0-or-later
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace OCA\Memories\Controller;
use OCA\Memories\Db\TimelineQuery;
use OCA\Memories\Db\TimelineRoot;
use OCA\Memories\Exif;
use OCA\Memories\Util;
use OCP\Files\File;
use OCP\Files\Folder;
use OCP\Files\IRootFolder;
use OCP\IConfig;
use OCP\IUserSession;
trait GenericApiControllerFs
{
use GenericApiControllerParams;
use GenericApiControllerUtils;
protected IConfig $config;
protected IUserSession $userSession;
protected IRootFolder $rootFolder;
protected TimelineQuery $timelineQuery;
/** Get the TimelineRoot object relevant to the request */
protected function getRequestRoot()
{
$user = $this->userSession->getUser();
$root = new TimelineRoot();
// Albums have no folder
if ($this->albumsIsEnabled() && $this->request->getParam('album')) {
if (null !== $user) {
return $root;
}
if (($token = $this->getShareToken()) && $this->timelineQuery->getAlbumByLink($token)) {
return $root;
}
}
// Public shared folder
if ($share = $this->getShareNode()) { // can throw
if (!$share instanceof Folder) {
throw new \Exception('Share is not a folder');
}
$root->addFolder($share);
return $root;
}
// Anything else needs a user
if (null === $user) {
throw new \Exception('User not logged in');
}
$uid = $user->getUID();
$folder = null;
$folderPath = $this->request->getParam('folder');
$userFolder = $this->rootFolder->getUserFolder($uid);
try {
if (null !== $folderPath) {
$folder = $userFolder->get(Exif::removeExtraSlash($folderPath));
$root->addFolder($folder);
} else {
$timelinePath = $this->request->getParam('timelinePath', Exif::getPhotosPath($this->config, $uid));
$timelinePath = Exif::removeExtraSlash($timelinePath);
// Multiple timeline path support
$paths = explode(';', $timelinePath);
foreach ($paths as &$path) {
$folder = $userFolder->get(trim($path));
$root->addFolder($folder);
}
$root->addMountPoints();
}
} catch (\OCP\Files\NotFoundException $e) {
$msg = $e->getMessage();
throw new \Exception("Folder not found: {$msg}");
}
return $root;
}
/**
* Get a file with ID for the current user.
*/
protected function getUserFile(int $fileId): ?File
{
// Don't check self for share token
if ($this->getShareToken()) {
return $this->getShareFile($fileId);
}
// Check both user folder and album
return $this->getUserFolderFile($fileId) ??
$this->getAlbumFile($fileId);
}
/**
* Get a file with ID from user's folder.
*/
protected function getUserFolderFile(int $id): ?File
{
$user = $this->userSession->getUser();
if (null === $user) {
return null;
}
$userFolder = $this->rootFolder->getUserFolder($user->getUID());
// No need to force permissions when reading
// from the user's own folder. This includes shared
// folders and files from other users.
return $this->getOneFileFromFolder($userFolder, $id);
}
/**
* Get a file with ID from an album.
*/
protected function getAlbumFile(int $id): ?File
{
$user = $this->userSession->getUser();
if (null === $user) {
return null;
}
$uid = $user->getUID();
$owner = $this->timelineQuery->albumHasUserFile($uid, $id);
if (!$owner) {
return null;
}
$folder = $this->rootFolder->getUserFolder($owner);
// Album files are always read-only
// Note that albums have lowest priority, so it means the
// user doesn't have access to the file in their own folder.
return $this->getOneFileFromFolder($folder, $id, \OCP\Constants::PERMISSION_READ);
}
/**
* Get a file with ID from a public share.
*
* @param int $fileId
*/
protected function getShareFile(int $id): ?File
{
try {
// Album share
if ($this->request->getParam('album')) {
$album = $this->timelineQuery->getAlbumByLink($this->getShareToken());
if (null === $album) {
return null;
}
$owner = $this->timelineQuery->albumHasFile((int) $album['album_id'], $id);
if (!$owner) {
return null;
}
$folder = $this->rootFolder->getUserFolder($owner);
// Public albums are always read-only
return $this->getOneFileFromFolder($folder, $id, \OCP\Constants::PERMISSION_READ);
}
// Folder share
if ($share = $this->getShareNode()) {
// Public shares may allow editing
// Just use the same permissions as the share
if ($share instanceof File) {
return $share;
}
if ($share instanceof Folder) {
return $this->getOneFileFromFolder($share, $id, $share->getPermissions());
}
return null;
}
} catch (\Exception $e) {
}
return null;
}
protected function getShareObject()
{
// Get token from request
$token = $this->getShareToken();
if (null === $token) {
return null;
}
// Get share by token
$share = \OC::$server->get(\OCP\Share\IManager::class)->getShareByToken($token);
if (!PublicController::validateShare($share)) {
return null;
}
// Check if share is password protected
if (($password = $share->getPassword()) !== null) {
$session = \OC::$server->get(\OCP\ISession::class);
// https://github.com/nextcloud/server/blob/0447b53bda9fe95ea0cbed765aa332584605d652/lib/public/AppFramework/PublicShareController.php#L119
if (
$session->get('public_link_authenticated_token') !== $token
|| $session->get('public_link_authenticated_password_hash') !== $password
) {
throw new \Exception('Share is password protected and user is not authenticated');
}
}
return $share;
}
protected function getShareNode()
{
$share = $this->getShareObject();
if (null === $share) {
return null;
}
// Get node from share
$node = $share->getNode(); // throws exception if not found
if (!$node->isReadable() || !$node->isShareable()) {
throw new \Exception('Share not found or invalid');
}
// Force permissions from the share onto the node
Util::forcePermissions($node, $share->getPermissions());
return $node;
}
/**
* Helper to get one file or null from a fiolder.
*
* @param Folder $folder Folder to search in
* @param int $id Id of the file
* @param int $perm Permissions to force on the file
*/
private function getOneFileFromFolder(Folder $folder, int $id, int $perm = -1): ?File
{
// Check for permissions and get numeric Id
$file = $folder->getById($id);
if (0 === \count($file)) {
return null;
}
$file = $file[0];
// Check if node is a file
if (!$file instanceof File) {
return null;
}
// Check read permission
if (!$file->isReadable()) {
return null;
}
// Force file permissions if required
if ($perm >= 0) {
Util::forcePermissions($file, $perm);
}
return $file;
}
}