280 lines
7.4 KiB
PHP
280 lines
7.4 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 Lars <winnetou+github@catolic.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 Morris Jobke <hey@morrisjobke.de>
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* @author Olivier Paroz <github@oparoz.com>
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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 Stefan Weil <sw@weilnetz.de>
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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;
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use OCP\ILogger;
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use OCP\IConfig;
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use OCP\ITempManager;
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class TempManager implements ITempManager {
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/** @var string[] Current temporary files and folders, used for cleanup */
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protected $current = [];
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/** @var string i.e. /tmp on linux systems */
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protected $tmpBaseDir;
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/** @var ILogger */
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protected $log;
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/** @var IConfig */
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protected $config;
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/** Prefix */
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const TMP_PREFIX = 'oc_tmp_';
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/**
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* @param \OCP\ILogger $logger
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* @param \OCP\IConfig $config
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*/
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public function __construct(ILogger $logger, IConfig $config) {
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$this->log = $logger;
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$this->config = $config;
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$this->tmpBaseDir = $this->getTempBaseDir();
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}
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/**
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* Builds the filename with suffix and removes potential dangerous characters
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* such as directory separators.
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*
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* @param string $absolutePath Absolute path to the file / folder
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* @param string $postFix Postfix appended to the temporary file name, may be user controlled
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* @return string
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*/
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private function buildFileNameWithSuffix($absolutePath, $postFix = '') {
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if($postFix !== '') {
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$postFix = '.' . ltrim($postFix, '.');
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$postFix = str_replace(['\\', '/'], '', $postFix);
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$absolutePath .= '-';
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}
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return $absolutePath . $postFix;
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}
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/**
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* Create a temporary file and return the path
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*
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* @param string $postFix Postfix appended to the temporary file name
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* @return string
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*/
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public function getTemporaryFile($postFix = '') {
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if (is_writable($this->tmpBaseDir)) {
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// To create an unique file and prevent the risk of race conditions
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// or duplicated temporary files by other means such as collisions
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// we need to create the file using `tempnam` and append a possible
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// postfix to it later
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$file = tempnam($this->tmpBaseDir, self::TMP_PREFIX);
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$this->current[] = $file;
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// If a postfix got specified sanitize it and create a postfixed
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// temporary file
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if($postFix !== '') {
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$fileNameWithPostfix = $this->buildFileNameWithSuffix($file, $postFix);
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touch($fileNameWithPostfix);
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chmod($fileNameWithPostfix, 0600);
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$this->current[] = $fileNameWithPostfix;
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return $fileNameWithPostfix;
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}
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return $file;
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} else {
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$this->log->warning(
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'Can not create a temporary file in directory {dir}. Check it exists and has correct permissions',
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[
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'dir' => $this->tmpBaseDir,
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]
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);
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return false;
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}
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}
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/**
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* Create a temporary folder and return the path
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*
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* @param string $postFix Postfix appended to the temporary folder name
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* @return string
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*/
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public function getTemporaryFolder($postFix = '') {
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if (is_writable($this->tmpBaseDir)) {
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// To create an unique directory and prevent the risk of race conditions
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// or duplicated temporary files by other means such as collisions
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// we need to create the file using `tempnam` and append a possible
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// postfix to it later
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$uniqueFileName = tempnam($this->tmpBaseDir, self::TMP_PREFIX);
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$this->current[] = $uniqueFileName;
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// Build a name without postfix
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$path = $this->buildFileNameWithSuffix($uniqueFileName . '-folder', $postFix);
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mkdir($path, 0700);
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$this->current[] = $path;
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return $path . '/';
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} else {
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$this->log->warning(
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'Can not create a temporary folder in directory {dir}. Check it exists and has correct permissions',
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[
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'dir' => $this->tmpBaseDir,
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]
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);
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return false;
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}
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}
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/**
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* Remove the temporary files and folders generated during this request
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*/
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public function clean() {
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$this->cleanFiles($this->current);
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}
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/**
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* @param string[] $files
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*/
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protected function cleanFiles($files) {
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foreach ($files as $file) {
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if (file_exists($file)) {
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try {
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\OC_Helper::rmdirr($file);
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} catch (\UnexpectedValueException $ex) {
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$this->log->warning(
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"Error deleting temporary file/folder: {file} - Reason: {error}",
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[
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'file' => $file,
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'error' => $ex->getMessage(),
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]
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);
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}
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}
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}
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}
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/**
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* Remove old temporary files and folders that were failed to be cleaned
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*/
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public function cleanOld() {
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$this->cleanFiles($this->getOldFiles());
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}
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/**
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* Get all temporary files and folders generated by oc older than an hour
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*
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* @return string[]
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*/
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protected function getOldFiles() {
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$cutOfTime = time() - 3600;
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$files = [];
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$dh = opendir($this->tmpBaseDir);
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if ($dh) {
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while (($file = readdir($dh)) !== false) {
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if (substr($file, 0, 7) === self::TMP_PREFIX) {
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$path = $this->tmpBaseDir . '/' . $file;
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$mtime = filemtime($path);
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if ($mtime < $cutOfTime) {
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$files[] = $path;
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}
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}
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}
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}
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return $files;
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}
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/**
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* Get the temporary base directory configured on the server
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*
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* @return string Path to the temporary directory or null
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* @throws \UnexpectedValueException
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*/
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public function getTempBaseDir() {
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if ($this->tmpBaseDir) {
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return $this->tmpBaseDir;
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}
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$directories = [];
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if ($temp = $this->config->getSystemValue('tempdirectory', null)) {
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$directories[] = $temp;
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}
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if ($temp = \OC::$server->getIniWrapper()->get('upload_tmp_dir')) {
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$directories[] = $temp;
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}
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if ($temp = getenv('TMP')) {
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$directories[] = $temp;
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}
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if ($temp = getenv('TEMP')) {
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$directories[] = $temp;
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}
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if ($temp = getenv('TMPDIR')) {
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$directories[] = $temp;
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}
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if ($temp = sys_get_temp_dir()) {
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$directories[] = $temp;
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}
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foreach ($directories as $dir) {
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if ($this->checkTemporaryDirectory($dir)) {
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return $dir;
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}
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}
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$temp = tempnam(dirname(__FILE__), '');
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if (file_exists($temp)) {
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unlink($temp);
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return dirname($temp);
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}
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throw new \UnexpectedValueException('Unable to detect system temporary directory');
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}
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/**
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* Check if a temporary directory is ready for use
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*
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* @param mixed $directory
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* @return bool
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*/
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private function checkTemporaryDirectory($directory) {
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// suppress any possible errors caused by is_writable
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// checks missing or invalid path or characters, wrong permissions etc
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try {
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if (is_writable($directory)) {
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return true;
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}
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} catch (\Exception $e) {
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}
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$this->log->warning('Temporary directory {dir} is not present or writable',
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['dir' => $directory]
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);
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return false;
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}
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/**
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* Override the temporary base directory
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*
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* @param string $directory
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*/
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public function overrideTempBaseDir($directory) {
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$this->tmpBaseDir = $directory;
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}
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}
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