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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Bjoern Schiessle <bjoern@schiessle.org>
* @author Björn Schießle <bjoern@schiessle.org>
* @author Joas Schilling <coding@schilljs.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
* @author Vincent Petry <pvince81@owncloud.com>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCA\Files_Trashbin;
use OC\Files\Filesystem;
use OC\Files\Storage\Wrapper\Wrapper;
use OC\Files\View;
use OCA\Files_Trashbin\Events\MoveToTrashEvent;
use OCP\Encryption\Exceptions\GenericEncryptionException;
use OCP\Files\IRootFolder;
use OCP\Files\Node;
use OCP\ILogger;
use OCP\IUserManager;
use Symfony\Component\EventDispatcher\EventDispatcher;
class Storage extends Wrapper {
private $mountPoint;
// remember already deleted files to avoid infinite loops if the trash bin
// move files across storages
private $deletedFiles = array();
/**
* Disable trash logic
*
* @var bool
*/
private static $disableTrash = false;
/**
* remember which file/folder was moved out of s shared folder
* in this case we want to add a copy to the owners trash bin
*
* @var array
*/
private static $moveOutOfSharedFolder = [];
/** @var IUserManager */
private $userManager;
/** @var ILogger */
private $logger;
/** @var EventDispatcher */
private $eventDispatcher;
/** @var IRootFolder */
private $rootFolder;
/**
* Storage constructor.
*
* @param array $parameters
* @param IUserManager|null $userManager
* @param ILogger|null $logger
* @param EventDispatcher|null $eventDispatcher
* @param IRootFolder|null $rootFolder
*/
public function __construct($parameters,
IUserManager $userManager = null,
ILogger $logger = null,
EventDispatcher $eventDispatcher = null,
IRootFolder $rootFolder = null) {
$this->mountPoint = $parameters['mountPoint'];
$this->userManager = $userManager;
$this->logger = $logger;
$this->eventDispatcher = $eventDispatcher;
$this->rootFolder = $rootFolder;
parent::__construct($parameters);
}
/**
* @internal
*/
public static function preRenameHook($params) {
// in cross-storage cases, a rename is a copy + unlink,
// that last unlink must not go to trash, only exception:
// if the file was moved from a shared storage to a local folder,
// in this case the owner should get a copy in his trash bin so that
// they can restore the files again
$oldPath = $params['oldpath'];
$newPath = dirname($params['newpath']);
$currentUser = \OC::$server->getUserSession()->getUser();
$fileMovedOutOfSharedFolder = false;
try {
if ($currentUser) {
$currentUserId = $currentUser->getUID();
$view = new View($currentUserId . '/files');
$fileInfo = $view->getFileInfo($oldPath);
if ($fileInfo) {
$sourceStorage = $fileInfo->getStorage();
$sourceOwner = $view->getOwner($oldPath);
$targetOwner = $view->getOwner($newPath);
if ($sourceOwner !== $targetOwner
&& $sourceStorage->instanceOfStorage('OCA\Files_Sharing\SharedStorage')
) {
$fileMovedOutOfSharedFolder = true;
}
}
}
} catch (\Exception $e) {
// do nothing, in this case we just disable the trashbin and continue
$logger = \OC::$server->getLogger();
$logger->debug('Trashbin storage could not check if a file was moved out of a shared folder: ' . $e->getMessage());
}
if($fileMovedOutOfSharedFolder) {
self::$moveOutOfSharedFolder['/' . $currentUserId . '/files' . $oldPath] = true;
} else {
self::$disableTrash = true;
}
}
/**
* @internal
*/
public static function postRenameHook($params) {
self::$disableTrash = false;
}
/**
* Rename path1 to path2 by calling the wrapped storage.
*
* @param string $path1 first path
* @param string $path2 second path
* @return bool
*/
public function rename($path1, $path2) {
$result = $this->storage->rename($path1, $path2);
if ($result === false) {
// when rename failed, the post_rename hook isn't triggered,
// but we still want to reenable the trash logic
self::$disableTrash = false;
}
return $result;
}
/**
* Deletes the given file by moving it into the trashbin.
*
* @param string $path path of file or folder to delete
*
* @return bool true if the operation succeeded, false otherwise
*/
public function unlink($path) {
try {
if (isset(self::$moveOutOfSharedFolder[$this->mountPoint . $path])) {
$result = $this->doDelete($path, 'unlink', true);
unset(self::$moveOutOfSharedFolder[$this->mountPoint . $path]);
} else {
$result = $this->doDelete($path, 'unlink');
}
} catch (GenericEncryptionException $e) {
// in case of a encryption exception we delete the file right away
$this->logger->info(
"Can't move file" . $path .
"to the trash bin, therefore it was deleted right away");
$result = $this->storage->unlink($path);
}
return $result;
}
/**
* Deletes the given folder by moving it into the trashbin.
*
* @param string $path path of folder to delete
*
* @return bool true if the operation succeeded, false otherwise
*/
public function rmdir($path) {
if (isset(self::$moveOutOfSharedFolder[$this->mountPoint . $path])) {
$result = $this->doDelete($path, 'rmdir', true);
unset(self::$moveOutOfSharedFolder[$this->mountPoint . $path]);
} else {
$result = $this->doDelete($path, 'rmdir');
}
return $result;
}
/**
* check if it is a file located in data/user/files only files in the
* 'files' directory should be moved to the trash
*
* @param $path
* @return bool
*/
protected function shouldMoveToTrash($path){
// check if there is a app which want to disable the trash bin for this file
$fileId = $this->storage->getCache()->getId($path);
$nodes = $this->rootFolder->getById($fileId);
foreach ($nodes as $node) {
$event = $this->createMoveToTrashEvent($node);
$this->eventDispatcher->dispatch('OCA\Files_Trashbin::moveToTrash', $event);
if ($event->shouldMoveToTrashBin() === false) {
return false;
}
}
$normalized = Filesystem::normalizePath($this->mountPoint . '/' . $path);
$parts = explode('/', $normalized);
if (count($parts) < 4) {
return false;
}
if ($parts[2] === 'files' && $this->userManager->userExists($parts[1])) {
return true;
}
return false;
}
/**
* get move to trash event
*
* @param Node $node
* @return MoveToTrashEvent
*/
protected function createMoveToTrashEvent(Node $node) {
$event = new MoveToTrashEvent($node);
return $event;
}
/**
* Run the delete operation with the given method
*
* @param string $path path of file or folder to delete
* @param string $method either "unlink" or "rmdir"
* @param bool $ownerOnly delete for owner only (if file gets moved out of a shared folder)
*
* @return bool true if the operation succeeded, false otherwise
*/
private function doDelete($path, $method, $ownerOnly = false) {
if (self::$disableTrash
|| !\OC_App::isEnabled('files_trashbin')
|| (pathinfo($path, PATHINFO_EXTENSION) === 'part')
|| $this->shouldMoveToTrash($path) === false
) {
return call_user_func_array([$this->storage, $method], [$path]);
}
// check permissions before we continue, this is especially important for
// shared files
if (!$this->isDeletable($path)) {
return false;
}
$normalized = Filesystem::normalizePath($this->mountPoint . '/' . $path, true, false, true);
$result = true;
$view = Filesystem::getView();
if (!isset($this->deletedFiles[$normalized]) && $view instanceof View) {
$this->deletedFiles[$normalized] = $normalized;
if ($filesPath = $view->getRelativePath($normalized)) {
$filesPath = trim($filesPath, '/');
$result = \OCA\Files_Trashbin\Trashbin::move2trash($filesPath, $ownerOnly);
// in cross-storage cases the file will be copied
// but not deleted, so we delete it here
if ($result) {
call_user_func_array([$this->storage, $method], [$path]);
}
} else {
$result = call_user_func_array([$this->storage, $method], [$path]);
}
unset($this->deletedFiles[$normalized]);
} else if ($this->storage->file_exists($path)) {
$result = call_user_func_array([$this->storage, $method], [$path]);
}
return $result;
}
/**
* Setup the storate wrapper callback
*/
public static function setupStorage() {
\OC\Files\Filesystem::addStorageWrapper('oc_trashbin', function ($mountPoint, $storage) {
return new \OCA\Files_Trashbin\Storage(
array('storage' => $storage, 'mountPoint' => $mountPoint),
\OC::$server->getUserManager(),
\OC::$server->getLogger(),
\OC::$server->getEventDispatcher(),
\OC::$server->getLazyRootFolder()
);
}, 1);
}
}