539 lines
13 KiB
PHP
539 lines
13 KiB
PHP
<?php
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/**
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* Copyright (c) 2012 Robin Appelman <icewind@owncloud.com>
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* This file is licensed under the Affero General Public License version 3 or
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* later.
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* See the COPYING-README file.
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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\Scanner;
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use OC\Files\Cache\Storage;
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use OC\Files\Filesystem;
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use OC\Files\Cache\Watcher;
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use OCP\Files\FileNameTooLongException;
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use OCP\Files\InvalidCharacterInPathException;
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use OCP\Files\InvalidPathException;
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use OCP\Files\ReservedWordException;
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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 \OC\Files\Storage\Storage {
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protected $cache;
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protected $scanner;
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protected $watcher;
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protected $storageCache;
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protected $mountOptions = [];
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/**
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* @var string[]
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*/
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protected $cachedFiles = array();
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public function __construct($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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if (\OC_Util::isSharingDisabledForUser()) {
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return false;
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}
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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, $target);
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$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_Helper::getFileNameMimeType($path);
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} else {
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return false;
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}
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}
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public function hash($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 $path
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* @return string
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*/
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protected function toTmpFile($path) { //no longer in the storage api, still useful here
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$source = $this->fopen($path, 'r');
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if (!$source) {
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return false;
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}
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if ($pos = strrpos($path, '.')) {
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$extension = substr($path, $pos);
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} else {
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$extension = '';
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}
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$tmpFile = \OC_Helper::tmpFile($extension);
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$target = fopen($tmpFile, 'w');
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\OC_Helper::streamCopy($source, $target);
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fclose($target);
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return $tmpFile;
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}
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public function getLocalFolder($path) {
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$baseDir = \OC_Helper::tmpFolder();
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$this->addLocalFolder($path, $baseDir);
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return $baseDir;
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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($dh)) !== false) {
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if ($file !== '.' and $file !== '..') {
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if ($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 $query
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*/
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protected function searchInDir($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($dh)) !== false) {
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if ($item == '.' || $item == '..') continue;
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if (strstr(strtolower($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 = $this;
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}
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if (!isset($this->cache)) {
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$this->cache = new Cache($storage);
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}
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return $this->cache;
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}
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public function getScanner($path = '', $storage = null) {
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if (!$storage) {
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$storage = $this;
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}
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if (!isset($this->scanner)) {
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$this->scanner = new Scanner($storage);
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}
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return $this->scanner;
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}
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public function getWatcher($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_ONCE);
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$this->watcher->setPolicy($this->getMountOption('filesystem_check_changes', $globalPolicy));
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}
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return $this->watcher;
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}
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public function getStorageCache($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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$this->storageCache = new Storage($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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return \OC_User::getUser();
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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 $path
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* @return string|false
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*/
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public function getETag($path) {
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$ETagFunction = \OC\Connector\Sabre\Node::$ETagFunction;
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if ($ETagFunction) {
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$hash = call_user_func($ETagFunction, $path);
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return $hash;
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} else {
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return uniqid();
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}
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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('/', $output);
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}
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public function test() {
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if ($this->stat('')) {
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return true;
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}
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return false;
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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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* @param string $path
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*/
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protected function getCachedFile($path) {
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if (!isset($this->cachedFiles[$path])) {
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$this->cachedFiles[$path] = $this->toTmpFile($path);
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}
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return $this->cachedFiles[$path];
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}
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protected function removeCachedFile($path) {
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unset($this->cachedFiles[$path]);
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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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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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*/
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public function verifyPath($path, $fileName) {
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if (isset($fileName[255])) {
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throw new FileNameTooLongException();
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}
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// NOTE: $path will remain unverified for now
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if (\OC_Util::runningOnWindows()) {
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$this->verifyWindowsPath($fileName);
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} else {
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$this->verifyPosixPath($fileName);
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}
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}
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/**
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* https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247%28v=vs.85%29.aspx
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* @param string $fileName
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* @throws InvalidPathException
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*/
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protected function verifyWindowsPath($fileName) {
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$fileName = trim($fileName);
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$this->scanForInvalidCharacters($fileName, "\\/<>:\"|?*");
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$reservedNames = ['CON', 'PRN', 'AUX', 'NUL', 'COM1', 'COM2', 'COM3', 'COM4', 'COM5', 'COM6', 'COM7', 'COM8', 'COM9', 'LPT1', 'LPT2', 'LPT3', 'LPT4', 'LPT5', 'LPT6', 'LPT7', 'LPT8', 'LPT9'];
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if (in_array(strtoupper($fileName), $reservedNames)) {
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throw new ReservedWordException();
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}
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}
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/**
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* @param string $fileName
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* @throws InvalidPathException
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*/
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protected function verifyPosixPath($fileName) {
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$fileName = trim($fileName);
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$this->scanForInvalidCharacters($fileName, "\\/");
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$reservedNames = ['*'];
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if (in_array($fileName, $reservedNames)) {
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throw new ReservedWordException();
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}
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}
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/**
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* @param string $fileName
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* @param string $invalidChars
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* @throws InvalidPathException
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*/
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private function scanForInvalidCharacters($fileName, $invalidChars) {
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foreach(str_split($invalidChars) as $char) {
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if (strpos($fileName, $char) !== false) {
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throw new InvalidCharacterInPathException();
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}
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}
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$sanitizedFileName = filter_var($fileName, FILTER_UNSAFE_RAW, FILTER_FLAG_STRIP_LOW);
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if($sanitizedFileName !== $fileName) {
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throw new InvalidCharacterInPathException();
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}
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}
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/**
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* @param array $options
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*/
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public function setMountOptions(array $options) {
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$this->mountOptions = $options;
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}
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/**
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* @param string $name
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* @param mixed $default
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* @return mixed
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*/
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public function getMountOption($name, $default = null) {
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return isset($this->mountOptions[$name]) ? $this->mountOptions[$name] : $default;
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}
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}
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