832 lines
22 KiB
PHP
832 lines
22 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
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* @author Bart Visscher <bartv@thisnet.nl>
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* @author Björn Schießle <bjoern@schiessle.org>
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* @author hkjolhede <hkjolhede@gmail.com>
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* @author Joas Schilling <coding@schilljs.com>
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* @author Jörn Friedrich Dreyer <jfd@butonic.de>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Martin Mattel <martin.mattel@diemattels.at>
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* @author Michael Gapczynski <GapczynskiM@gmail.com>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Robin McCorkell <robin@mccorkell.me.uk>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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* @author Sam Tuke <mail@samtuke.com>
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* @author scambra <sergio@entrecables.com>
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* @author Stefan Weil <sw@weilnetz.de>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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* @author Vincent Petry <pvince81@owncloud.com>
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* @author Vinicius Cubas Brand <vinicius@eita.org.br>
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*
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* @license AGPL-3.0
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*
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* This code 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, version 3,
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* as published by the Free Software Foundation.
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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, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OC\Files\Storage;
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use OC\Files\Cache\Cache;
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use OC\Files\Cache\Propagator;
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use OC\Files\Cache\Scanner;
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use OC\Files\Cache\Updater;
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use OC\Files\Filesystem;
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use OC\Files\Cache\Watcher;
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use OCP\Files\EmptyFileNameException;
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use OCP\Files\FileNameTooLongException;
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use OCP\Files\InvalidCharacterInPathException;
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use OCP\Files\InvalidDirectoryException;
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use OCP\Files\InvalidPathException;
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use OCP\Files\ReservedWordException;
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use OCP\Files\Storage\ILockingStorage;
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use OCP\Files\Storage\IStorage;
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use OCP\Files\Storage\IWriteStreamStorage;
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use OCP\ILogger;
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use OCP\Lock\ILockingProvider;
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use OCP\Lock\LockedException;
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/**
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* Storage backend class for providing common filesystem operation methods
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* which are not storage-backend specific.
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*
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* \OC\Files\Storage\Common is never used directly; it is extended by all other
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* storage backends, where its methods may be overridden, and additional
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* (backend-specific) methods are defined.
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*
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* Some \OC\Files\Storage\Common methods call functions which are first defined
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* in classes which extend it, e.g. $this->stat() .
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*/
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abstract class Common implements Storage, ILockingStorage, IWriteStreamStorage {
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use LocalTempFileTrait;
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protected $cache;
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protected $scanner;
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protected $watcher;
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protected $propagator;
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protected $storageCache;
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protected $updater;
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protected $mountOptions = [];
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protected $owner = null;
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private $shouldLogLocks = null;
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private $logger;
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public function __construct($parameters) {
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}
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/**
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* Remove a file or folder
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*
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* @param string $path
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* @return bool
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*/
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protected function remove($path) {
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if ($this->is_dir($path)) {
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return $this->rmdir($path);
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} else if ($this->is_file($path)) {
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return $this->unlink($path);
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} else {
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return false;
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}
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}
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public function is_dir($path) {
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return $this->filetype($path) === 'dir';
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}
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public function is_file($path) {
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return $this->filetype($path) === 'file';
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}
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public function filesize($path) {
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if ($this->is_dir($path)) {
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return 0; //by definition
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} else {
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$stat = $this->stat($path);
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if (isset($stat['size'])) {
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return $stat['size'];
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} else {
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return 0;
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}
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}
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}
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public function isReadable($path) {
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// at least check whether it exists
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// subclasses might want to implement this more thoroughly
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return $this->file_exists($path);
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}
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public function isUpdatable($path) {
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// at least check whether it exists
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// subclasses might want to implement this more thoroughly
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// a non-existing file/folder isn't updatable
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return $this->file_exists($path);
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}
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public function isCreatable($path) {
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if ($this->is_dir($path) && $this->isUpdatable($path)) {
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return true;
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}
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return false;
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}
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public function isDeletable($path) {
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if ($path === '' || $path === '/') {
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return false;
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}
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$parent = dirname($path);
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return $this->isUpdatable($parent) && $this->isUpdatable($path);
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}
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public function isSharable($path) {
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return $this->isReadable($path);
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}
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public function getPermissions($path) {
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$permissions = 0;
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if ($this->isCreatable($path)) {
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$permissions |= \OCP\Constants::PERMISSION_CREATE;
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}
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if ($this->isReadable($path)) {
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$permissions |= \OCP\Constants::PERMISSION_READ;
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}
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if ($this->isUpdatable($path)) {
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$permissions |= \OCP\Constants::PERMISSION_UPDATE;
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}
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if ($this->isDeletable($path)) {
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$permissions |= \OCP\Constants::PERMISSION_DELETE;
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}
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if ($this->isSharable($path)) {
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$permissions |= \OCP\Constants::PERMISSION_SHARE;
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}
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return $permissions;
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}
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public function filemtime($path) {
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$stat = $this->stat($path);
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if (isset($stat['mtime']) && $stat['mtime'] > 0) {
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return $stat['mtime'];
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} else {
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return 0;
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}
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}
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public function file_get_contents($path) {
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$handle = $this->fopen($path, "r");
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if (!$handle) {
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return false;
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}
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$data = stream_get_contents($handle);
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fclose($handle);
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return $data;
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}
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public function file_put_contents($path, $data) {
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$handle = $this->fopen($path, "w");
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$this->removeCachedFile($path);
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$count = fwrite($handle, $data);
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fclose($handle);
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return $count;
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}
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public function rename($path1, $path2) {
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$this->remove($path2);
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$this->removeCachedFile($path1);
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return $this->copy($path1, $path2) and $this->remove($path1);
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}
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public function copy($path1, $path2) {
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if ($this->is_dir($path1)) {
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$this->remove($path2);
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$dir = $this->opendir($path1);
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$this->mkdir($path2);
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while ($file = readdir($dir)) {
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if (!Filesystem::isIgnoredDir($file)) {
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if (!$this->copy($path1 . '/' . $file, $path2 . '/' . $file)) {
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return false;
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}
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}
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}
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closedir($dir);
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return true;
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} else {
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$source = $this->fopen($path1, 'r');
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$target = $this->fopen($path2, 'w');
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list(, $result) = \OC_Helper::streamCopy($source, $target);
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if (!$result) {
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\OC::$server->getLogger()->warning("Failed to write data while copying $path1 to $path2");
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}
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$this->removeCachedFile($path2);
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return $result;
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}
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}
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public function getMimeType($path) {
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if ($this->is_dir($path)) {
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return 'httpd/unix-directory';
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} elseif ($this->file_exists($path)) {
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return \OC::$server->getMimeTypeDetector()->detectPath($path);
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} else {
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return false;
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}
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}
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public function hash($type, $path, $raw = false) {
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$fh = $this->fopen($path, 'rb');
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$ctx = hash_init($type);
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hash_update_stream($ctx, $fh);
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fclose($fh);
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return hash_final($ctx, $raw);
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}
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public function search($query) {
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return $this->searchInDir($query);
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}
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public function getLocalFile($path) {
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return $this->getCachedFile($path);
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}
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/**
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* @param string $path
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* @param string $target
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*/
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private function addLocalFolder($path, $target) {
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$dh = $this->opendir($path);
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if (is_resource($dh)) {
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while (($file = readdir($dh)) !== false) {
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if (!\OC\Files\Filesystem::isIgnoredDir($file)) {
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if ($this->is_dir($path . '/' . $file)) {
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mkdir($target . '/' . $file);
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$this->addLocalFolder($path . '/' . $file, $target . '/' . $file);
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} else {
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$tmp = $this->toTmpFile($path . '/' . $file);
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rename($tmp, $target . '/' . $file);
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}
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}
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}
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}
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}
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/**
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* @param string $query
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* @param string $dir
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* @return array
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*/
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protected function searchInDir($query, $dir = '') {
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$files = array();
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$dh = $this->opendir($dir);
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if (is_resource($dh)) {
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while (($item = readdir($dh)) !== false) {
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if (\OC\Files\Filesystem::isIgnoredDir($item)) continue;
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if (strstr(strtolower($item), strtolower($query)) !== false) {
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$files[] = $dir . '/' . $item;
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}
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if ($this->is_dir($dir . '/' . $item)) {
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$files = array_merge($files, $this->searchInDir($query, $dir . '/' . $item));
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}
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}
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}
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closedir($dh);
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return $files;
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}
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/**
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* check if a file or folder has been updated since $time
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*
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* The method is only used to check if the cache needs to be updated. Storage backends that don't support checking
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* the mtime should always return false here. As a result storage implementations that always return false expect
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* exclusive access to the backend and will not pick up files that have been added in a way that circumvents
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* ownClouds filesystem.
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*
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* @param string $path
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* @param int $time
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* @return bool
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*/
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public function hasUpdated($path, $time) {
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return $this->filemtime($path) > $time;
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}
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public function getCache($path = '', $storage = null) {
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if (!$storage) {
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$storage = $this;
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}
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if (!isset($storage->cache)) {
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$storage->cache = new Cache($storage);
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}
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return $storage->cache;
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}
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public function getScanner($path = '', $storage = null) {
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if (!$storage) {
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$storage = $this;
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}
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if (!isset($storage->scanner)) {
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$storage->scanner = new Scanner($storage);
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}
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return $storage->scanner;
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}
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public function getWatcher($path = '', $storage = null) {
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if (!$storage) {
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$storage = $this;
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}
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if (!isset($this->watcher)) {
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$this->watcher = new Watcher($storage);
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$globalPolicy = \OC::$server->getConfig()->getSystemValue('filesystem_check_changes', Watcher::CHECK_NEVER);
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$this->watcher->setPolicy((int)$this->getMountOption('filesystem_check_changes', $globalPolicy));
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}
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return $this->watcher;
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}
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/**
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* get a propagator instance for the cache
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*
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* @param \OC\Files\Storage\Storage (optional) the storage to pass to the watcher
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* @return \OC\Files\Cache\Propagator
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*/
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public function getPropagator($storage = null) {
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if (!$storage) {
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$storage = $this;
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}
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if (!isset($storage->propagator)) {
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$storage->propagator = new Propagator($storage, \OC::$server->getDatabaseConnection());
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}
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return $storage->propagator;
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}
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public function getUpdater($storage = null) {
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if (!$storage) {
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$storage = $this;
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}
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if (!isset($storage->updater)) {
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$storage->updater = new Updater($storage);
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}
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return $storage->updater;
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}
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public function getStorageCache($storage = null) {
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if (!$storage) {
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$storage = $this;
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}
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if (!isset($this->storageCache)) {
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$this->storageCache = new \OC\Files\Cache\Storage($storage);
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}
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return $this->storageCache;
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}
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/**
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* get the owner of a path
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*
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* @param string $path The path to get the owner
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* @return string|false uid or false
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*/
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public function getOwner($path) {
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if ($this->owner === null) {
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$this->owner = \OC_User::getUser();
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}
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return $this->owner;
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}
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/**
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* get the ETag for a file or folder
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*
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* @param string $path
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* @return string
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*/
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public function getETag($path) {
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return uniqid();
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}
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/**
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* clean a path, i.e. remove all redundant '.' and '..'
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* making sure that it can't point to higher than '/'
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*
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* @param string $path The path to clean
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* @return string cleaned path
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*/
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public function cleanPath($path) {
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if (strlen($path) == 0 or $path[0] != '/') {
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$path = '/' . $path;
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}
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$output = array();
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foreach (explode('/', $path) as $chunk) {
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if ($chunk == '..') {
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array_pop($output);
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} else if ($chunk == '.') {
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} else {
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$output[] = $chunk;
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}
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}
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return implode('/', $output);
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}
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/**
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* Test a storage for availability
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*
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* @return bool
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*/
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public function test() {
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try {
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if ($this->stat('')) {
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return true;
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}
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\OC::$server->getLogger()->info("External storage not available: stat() failed");
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return false;
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} catch (\Exception $e) {
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\OC::$server->getLogger()->info("External storage not available: " . $e->getMessage());
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\OC::$server->getLogger()->logException($e, ['level' => ILogger::DEBUG]);
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return false;
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}
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}
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/**
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* get the free space in the storage
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*
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* @param string $path
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* @return int|false
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*/
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public function free_space($path) {
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return \OCP\Files\FileInfo::SPACE_UNKNOWN;
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}
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/**
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* {@inheritdoc}
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*/
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public function isLocal() {
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// the common implementation returns a temporary file by
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// default, which is not local
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return false;
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}
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/**
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* Check if the storage is an instance of $class or is a wrapper for a storage that is an instance of $class
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*
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* @param string $class
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* @return bool
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*/
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public function instanceOfStorage($class) {
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if (ltrim($class, '\\') === 'OC\Files\Storage\Shared') {
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// FIXME Temporary fix to keep existing checks working
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$class = '\OCA\Files_Sharing\SharedStorage';
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}
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return is_a($this, $class);
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}
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/**
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* A custom storage implementation can return an url for direct download of a give file.
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*
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* For now the returned array can hold the parameter url - in future more attributes might follow.
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*
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* @param string $path
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* @return array|false
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*/
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public function getDirectDownload($path) {
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return [];
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}
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/**
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* @inheritdoc
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* @throws InvalidPathException
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*/
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public function verifyPath($path, $fileName) {
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// verify empty and dot files
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$trimmed = trim($fileName);
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if ($trimmed === '') {
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throw new EmptyFileNameException();
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}
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if (\OC\Files\Filesystem::isIgnoredDir($trimmed)) {
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throw new InvalidDirectoryException();
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}
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if (!\OC::$server->getDatabaseConnection()->supports4ByteText()) {
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// verify database - e.g. mysql only 3-byte chars
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if (preg_match('%(?:
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\xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3
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| [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15
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| \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16
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)%xs', $fileName)) {
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throw new InvalidCharacterInPathException();
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}
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}
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if (isset($fileName[255])) {
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throw new FileNameTooLongException();
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}
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// NOTE: $path will remain unverified for now
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$this->verifyPosixPath($fileName);
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}
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/**
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* @param string $fileName
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* @throws InvalidPathException
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*/
|
|
protected function verifyPosixPath($fileName) {
|
|
$fileName = trim($fileName);
|
|
$this->scanForInvalidCharacters($fileName, "\\/");
|
|
$reservedNames = ['*'];
|
|
if (in_array($fileName, $reservedNames)) {
|
|
throw new ReservedWordException();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param string $fileName
|
|
* @param string $invalidChars
|
|
* @throws InvalidPathException
|
|
*/
|
|
private function scanForInvalidCharacters($fileName, $invalidChars) {
|
|
foreach (str_split($invalidChars) as $char) {
|
|
if (strpos($fileName, $char) !== false) {
|
|
throw new InvalidCharacterInPathException();
|
|
}
|
|
}
|
|
|
|
$sanitizedFileName = filter_var($fileName, FILTER_UNSAFE_RAW, FILTER_FLAG_STRIP_LOW);
|
|
if ($sanitizedFileName !== $fileName) {
|
|
throw new InvalidCharacterInPathException();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param array $options
|
|
*/
|
|
public function setMountOptions(array $options) {
|
|
$this->mountOptions = $options;
|
|
}
|
|
|
|
/**
|
|
* @param string $name
|
|
* @param mixed $default
|
|
* @return mixed
|
|
*/
|
|
public function getMountOption($name, $default = null) {
|
|
return isset($this->mountOptions[$name]) ? $this->mountOptions[$name] : $default;
|
|
}
|
|
|
|
/**
|
|
* @param IStorage $sourceStorage
|
|
* @param string $sourceInternalPath
|
|
* @param string $targetInternalPath
|
|
* @param bool $preserveMtime
|
|
* @return bool
|
|
*/
|
|
public function copyFromStorage(IStorage $sourceStorage, $sourceInternalPath, $targetInternalPath, $preserveMtime = false) {
|
|
if ($sourceStorage === $this) {
|
|
return $this->copy($sourceInternalPath, $targetInternalPath);
|
|
}
|
|
|
|
if ($sourceStorage->is_dir($sourceInternalPath)) {
|
|
$dh = $sourceStorage->opendir($sourceInternalPath);
|
|
$result = $this->mkdir($targetInternalPath);
|
|
if (is_resource($dh)) {
|
|
while ($result and ($file = readdir($dh)) !== false) {
|
|
if (!Filesystem::isIgnoredDir($file)) {
|
|
$result &= $this->copyFromStorage($sourceStorage, $sourceInternalPath . '/' . $file, $targetInternalPath . '/' . $file);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
$source = $sourceStorage->fopen($sourceInternalPath, 'r');
|
|
// TODO: call fopen in a way that we execute again all storage wrappers
|
|
// to avoid that we bypass storage wrappers which perform important actions
|
|
// for this operation. Same is true for all other operations which
|
|
// are not the same as the original one.Once this is fixed we also
|
|
// need to adjust the encryption wrapper.
|
|
$target = $this->fopen($targetInternalPath, 'w');
|
|
list(, $result) = \OC_Helper::streamCopy($source, $target);
|
|
if ($result and $preserveMtime) {
|
|
$this->touch($targetInternalPath, $sourceStorage->filemtime($sourceInternalPath));
|
|
}
|
|
fclose($source);
|
|
fclose($target);
|
|
|
|
if (!$result) {
|
|
// delete partially written target file
|
|
$this->unlink($targetInternalPath);
|
|
// delete cache entry that was created by fopen
|
|
$this->getCache()->remove($targetInternalPath);
|
|
}
|
|
}
|
|
return (bool)$result;
|
|
}
|
|
|
|
/**
|
|
* @param IStorage $sourceStorage
|
|
* @param string $sourceInternalPath
|
|
* @param string $targetInternalPath
|
|
* @return bool
|
|
*/
|
|
public function moveFromStorage(IStorage $sourceStorage, $sourceInternalPath, $targetInternalPath) {
|
|
if ($sourceStorage === $this) {
|
|
return $this->rename($sourceInternalPath, $targetInternalPath);
|
|
}
|
|
|
|
if (!$sourceStorage->isDeletable($sourceInternalPath)) {
|
|
return false;
|
|
}
|
|
|
|
$result = $this->copyFromStorage($sourceStorage, $sourceInternalPath, $targetInternalPath, true);
|
|
if ($result) {
|
|
if ($sourceStorage->is_dir($sourceInternalPath)) {
|
|
$result &= $sourceStorage->rmdir($sourceInternalPath);
|
|
} else {
|
|
$result &= $sourceStorage->unlink($sourceInternalPath);
|
|
}
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* @inheritdoc
|
|
*/
|
|
public function getMetaData($path) {
|
|
$permissions = $this->getPermissions($path);
|
|
if (!$permissions & \OCP\Constants::PERMISSION_READ) {
|
|
//can't read, nothing we can do
|
|
return null;
|
|
}
|
|
|
|
$data = [];
|
|
$data['mimetype'] = $this->getMimeType($path);
|
|
$data['mtime'] = $this->filemtime($path);
|
|
if ($data['mtime'] === false) {
|
|
$data['mtime'] = time();
|
|
}
|
|
if ($data['mimetype'] == 'httpd/unix-directory') {
|
|
$data['size'] = -1; //unknown
|
|
} else {
|
|
$data['size'] = $this->filesize($path);
|
|
}
|
|
$data['etag'] = $this->getETag($path);
|
|
$data['storage_mtime'] = $data['mtime'];
|
|
$data['permissions'] = $permissions;
|
|
|
|
return $data;
|
|
}
|
|
|
|
/**
|
|
* @param string $path
|
|
* @param int $type \OCP\Lock\ILockingProvider::LOCK_SHARED or \OCP\Lock\ILockingProvider::LOCK_EXCLUSIVE
|
|
* @param \OCP\Lock\ILockingProvider $provider
|
|
* @throws \OCP\Lock\LockedException
|
|
*/
|
|
public function acquireLock($path, $type, ILockingProvider $provider) {
|
|
$logger = $this->getLockLogger();
|
|
if ($logger) {
|
|
$typeString = ($type === ILockingProvider::LOCK_SHARED) ? 'shared' : 'exclusive';
|
|
$logger->info(
|
|
sprintf(
|
|
'acquire %s lock on "%s" on storage "%s"',
|
|
$typeString,
|
|
$path,
|
|
$this->getId()
|
|
),
|
|
[
|
|
'app' => 'locking',
|
|
]
|
|
);
|
|
}
|
|
try {
|
|
$provider->acquireLock('files/' . md5($this->getId() . '::' . trim($path, '/')), $type);
|
|
} catch (LockedException $e) {
|
|
if ($logger) {
|
|
$logger->logException($e);
|
|
}
|
|
throw $e;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param string $path
|
|
* @param int $type \OCP\Lock\ILockingProvider::LOCK_SHARED or \OCP\Lock\ILockingProvider::LOCK_EXCLUSIVE
|
|
* @param \OCP\Lock\ILockingProvider $provider
|
|
* @throws \OCP\Lock\LockedException
|
|
*/
|
|
public function releaseLock($path, $type, ILockingProvider $provider) {
|
|
$logger = $this->getLockLogger();
|
|
if ($logger) {
|
|
$typeString = ($type === ILockingProvider::LOCK_SHARED) ? 'shared' : 'exclusive';
|
|
$logger->info(
|
|
sprintf(
|
|
'release %s lock on "%s" on storage "%s"',
|
|
$typeString,
|
|
$path,
|
|
$this->getId()
|
|
),
|
|
[
|
|
'app' => 'locking',
|
|
]
|
|
);
|
|
}
|
|
try {
|
|
$provider->releaseLock('files/' . md5($this->getId() . '::' . trim($path, '/')), $type);
|
|
} catch (LockedException $e) {
|
|
if ($logger) {
|
|
$logger->logException($e);
|
|
}
|
|
throw $e;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param string $path
|
|
* @param int $type \OCP\Lock\ILockingProvider::LOCK_SHARED or \OCP\Lock\ILockingProvider::LOCK_EXCLUSIVE
|
|
* @param \OCP\Lock\ILockingProvider $provider
|
|
* @throws \OCP\Lock\LockedException
|
|
*/
|
|
public function changeLock($path, $type, ILockingProvider $provider) {
|
|
$logger = $this->getLockLogger();
|
|
if ($logger) {
|
|
$typeString = ($type === ILockingProvider::LOCK_SHARED) ? 'shared' : 'exclusive';
|
|
$logger->info(
|
|
sprintf(
|
|
'change lock on "%s" to %s on storage "%s"',
|
|
$path,
|
|
$typeString,
|
|
$this->getId()
|
|
),
|
|
[
|
|
'app' => 'locking',
|
|
]
|
|
);
|
|
}
|
|
try {
|
|
$provider->changeLock('files/' . md5($this->getId() . '::' . trim($path, '/')), $type);
|
|
} catch (LockedException $e) {
|
|
\OC::$server->getLogger()->logException($e);
|
|
throw $e;
|
|
}
|
|
}
|
|
|
|
private function getLockLogger() {
|
|
if (is_null($this->shouldLogLocks)) {
|
|
$this->shouldLogLocks = \OC::$server->getConfig()->getSystemValue('filelocking.debug', false);
|
|
$this->logger = $this->shouldLogLocks ? \OC::$server->getLogger() : null;
|
|
}
|
|
return $this->logger;
|
|
}
|
|
|
|
/**
|
|
* @return array [ available, last_checked ]
|
|
*/
|
|
public function getAvailability() {
|
|
return $this->getStorageCache()->getAvailability();
|
|
}
|
|
|
|
/**
|
|
* @param bool $isAvailable
|
|
*/
|
|
public function setAvailability($isAvailable) {
|
|
$this->getStorageCache()->setAvailability($isAvailable);
|
|
}
|
|
|
|
/**
|
|
* @return bool
|
|
*/
|
|
public function needsPartFile() {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* fallback implementation
|
|
*
|
|
* @param string $path
|
|
* @param resource $stream
|
|
* @param int $size
|
|
* @return int
|
|
*/
|
|
public function writeStream(string $path, $stream, int $size = null): int {
|
|
$target = $this->fopen($path, 'w');
|
|
if (!$target) {
|
|
return 0;
|
|
}
|
|
list($count, $result) = \OC_Helper::streamCopy($stream, $target);
|
|
fclose($stream);
|
|
fclose($target);
|
|
return $count;
|
|
}
|
|
}
|