443 lines
13 KiB
PHP
443 lines
13 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 Clark Tomlinson <fallen013@gmail.com>
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* @author Frank Karlitschek <frank@karlitschek.de>
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* @author Jakob Sack <mail@jakobsack.de>
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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 Ko- <k.stoffelen@cs.ru.nl>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Michael Gapczynski <GapczynskiM@gmail.com>
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* @author Nicolai Ehemann <en@enlightened.de>
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* @author noveens <noveen.sachdeva@research.iiit.ac.in>
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* @author Piotr Filiciak <piotr@filiciak.pl>
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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 Thibaut GRIDEL <tgridel@free.fr>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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* @author Victor Dubiniuk <dubiniuk@owncloud.com>
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* @author Vincent Petry <pvince81@owncloud.com>
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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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use OC\Files\View;
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use OC\Streamer;
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use OCP\Lock\ILockingProvider;
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/**
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* Class for file server access
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*
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*/
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class OC_Files {
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const FILE = 1;
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const ZIP_FILES = 2;
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const ZIP_DIR = 3;
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const UPLOAD_MIN_LIMIT_BYTES = 1048576; // 1 MiB
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private static $multipartBoundary = '';
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/**
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* @return string
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*/
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private static function getBoundary() {
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if (empty(self::$multipartBoundary)) {
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self::$multipartBoundary = md5(mt_rand());
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}
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return self::$multipartBoundary;
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}
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/**
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* @param string $filename
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* @param string $name
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* @param array $rangeArray ('from'=>int,'to'=>int), ...
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*/
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private static function sendHeaders($filename, $name, array $rangeArray) {
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OC_Response::setContentDispositionHeader($name, 'attachment');
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header('Content-Transfer-Encoding: binary', true);
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OC_Response::disableCaching();
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$fileSize = \OC\Files\Filesystem::filesize($filename);
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$type = \OC::$server->getMimeTypeDetector()->getSecureMimeType(\OC\Files\Filesystem::getMimeType($filename));
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if ($fileSize > -1) {
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if (!empty($rangeArray)) {
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header('HTTP/1.1 206 Partial Content', true);
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header('Accept-Ranges: bytes', true);
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if (count($rangeArray) > 1) {
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$type = 'multipart/byteranges; boundary='.self::getBoundary();
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// no Content-Length header here
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}
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else {
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header(sprintf('Content-Range: bytes %d-%d/%d', $rangeArray[0]['from'], $rangeArray[0]['to'], $fileSize), true);
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OC_Response::setContentLengthHeader($rangeArray[0]['to'] - $rangeArray[0]['from'] + 1);
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}
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}
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else {
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OC_Response::setContentLengthHeader($fileSize);
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}
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}
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header('Content-Type: '.$type, true);
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}
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/**
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* return the content of a file or return a zip file containing multiple files
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*
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* @param string $dir
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* @param string $files ; separated list of files to download
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* @param array $params ; 'head' boolean to only send header of the request ; 'range' http range header
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*/
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public static function get($dir, $files, $params = null) {
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$view = \OC\Files\Filesystem::getView();
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$getType = self::FILE;
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$filename = $dir;
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try {
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if (is_array($files) && count($files) === 1) {
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$files = $files[0];
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}
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if (!is_array($files)) {
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$filename = $dir . '/' . $files;
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if (!$view->is_dir($filename)) {
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self::getSingleFile($view, $dir, $files, is_null($params) ? array() : $params);
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return;
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}
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}
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$name = 'download';
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if (is_array($files)) {
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$getType = self::ZIP_FILES;
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$basename = basename($dir);
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if ($basename) {
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$name = $basename;
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}
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$filename = $dir . '/' . $name;
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} else {
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$filename = $dir . '/' . $files;
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$getType = self::ZIP_DIR;
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// downloading root ?
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if ($files !== '') {
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$name = $files;
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}
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}
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$streamer = new Streamer();
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OC_Util::obEnd();
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self::lockFiles($view, $dir, $files);
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$streamer->sendHeaders($name);
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$executionTime = intval(OC::$server->getIniWrapper()->getNumeric('max_execution_time'));
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if (strpos(@ini_get('disable_functions'), 'set_time_limit') === false) {
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@set_time_limit(0);
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}
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ignore_user_abort(true);
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if ($getType === self::ZIP_FILES) {
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foreach ($files as $file) {
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$file = $dir . '/' . $file;
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if (\OC\Files\Filesystem::is_file($file)) {
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$fileSize = \OC\Files\Filesystem::filesize($file);
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$fileTime = \OC\Files\Filesystem::filemtime($file);
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$fh = \OC\Files\Filesystem::fopen($file, 'r');
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$streamer->addFileFromStream($fh, basename($file), $fileSize, $fileTime);
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fclose($fh);
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} elseif (\OC\Files\Filesystem::is_dir($file)) {
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$streamer->addDirRecursive($file);
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}
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}
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} elseif ($getType === self::ZIP_DIR) {
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$file = $dir . '/' . $files;
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$streamer->addDirRecursive($file);
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}
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$streamer->finalize();
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set_time_limit($executionTime);
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self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
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} catch (\OCP\Lock\LockedException $ex) {
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self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
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OC::$server->getLogger()->logException($ex);
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$l = \OC::$server->getL10N('core');
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$hint = method_exists($ex, 'getHint') ? $ex->getHint() : '';
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\OC_Template::printErrorPage($l->t('File is currently busy, please try again later'), $hint);
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} catch (\OCP\Files\ForbiddenException $ex) {
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self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
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OC::$server->getLogger()->logException($ex);
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$l = \OC::$server->getL10N('core');
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\OC_Template::printErrorPage($l->t('Can\'t read file'), $ex->getMessage());
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} catch (\Exception $ex) {
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self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
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OC::$server->getLogger()->logException($ex);
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$l = \OC::$server->getL10N('core');
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$hint = method_exists($ex, 'getHint') ? $ex->getHint() : '';
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\OC_Template::printErrorPage($l->t('Can\'t read file'), $hint);
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}
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}
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/**
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* @param string $rangeHeaderPos
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* @param int $fileSize
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* @return array $rangeArray ('from'=>int,'to'=>int), ...
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*/
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private static function parseHttpRangeHeader($rangeHeaderPos, $fileSize) {
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$rArray=explode(',', $rangeHeaderPos);
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$minOffset = 0;
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$ind = 0;
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$rangeArray = array();
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foreach ($rArray as $value) {
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$ranges = explode('-', $value);
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if (is_numeric($ranges[0])) {
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if ($ranges[0] < $minOffset) { // case: bytes=500-700,601-999
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$ranges[0] = $minOffset;
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}
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if ($ind > 0 && $rangeArray[$ind-1]['to']+1 == $ranges[0]) { // case: bytes=500-600,601-999
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$ind--;
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$ranges[0] = $rangeArray[$ind]['from'];
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}
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}
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if (is_numeric($ranges[0]) && is_numeric($ranges[1]) && $ranges[0] < $fileSize && $ranges[0] <= $ranges[1]) {
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// case: x-x
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if ($ranges[1] >= $fileSize) {
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$ranges[1] = $fileSize-1;
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}
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$rangeArray[$ind++] = array( 'from' => $ranges[0], 'to' => $ranges[1], 'size' => $fileSize );
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$minOffset = $ranges[1] + 1;
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if ($minOffset >= $fileSize) {
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break;
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}
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}
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elseif (is_numeric($ranges[0]) && $ranges[0] < $fileSize) {
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// case: x-
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$rangeArray[$ind++] = array( 'from' => $ranges[0], 'to' => $fileSize-1, 'size' => $fileSize );
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break;
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}
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elseif (is_numeric($ranges[1])) {
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// case: -x
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if ($ranges[1] > $fileSize) {
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$ranges[1] = $fileSize;
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}
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$rangeArray[$ind++] = array( 'from' => $fileSize-$ranges[1], 'to' => $fileSize-1, 'size' => $fileSize );
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break;
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}
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}
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return $rangeArray;
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}
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/**
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* @param View $view
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* @param string $name
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* @param string $dir
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* @param array $params ; 'head' boolean to only send header of the request ; 'range' http range header
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*/
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private static function getSingleFile($view, $dir, $name, $params) {
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$filename = $dir . '/' . $name;
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OC_Util::obEnd();
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$view->lockFile($filename, ILockingProvider::LOCK_SHARED);
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$rangeArray = array();
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if (isset($params['range']) && substr($params['range'], 0, 6) === 'bytes=') {
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$rangeArray = self::parseHttpRangeHeader(substr($params['range'], 6),
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\OC\Files\Filesystem::filesize($filename));
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}
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if (\OC\Files\Filesystem::isReadable($filename)) {
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self::sendHeaders($filename, $name, $rangeArray);
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} elseif (!\OC\Files\Filesystem::file_exists($filename)) {
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header("HTTP/1.1 404 Not Found");
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$tmpl = new OC_Template('', '404', 'guest');
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$tmpl->printPage();
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exit();
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} else {
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header("HTTP/1.1 403 Forbidden");
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die('403 Forbidden');
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}
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if (isset($params['head']) && $params['head']) {
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return;
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}
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if (!empty($rangeArray)) {
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try {
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if (count($rangeArray) == 1) {
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$view->readfilePart($filename, $rangeArray[0]['from'], $rangeArray[0]['to']);
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}
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else {
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// check if file is seekable (if not throw UnseekableException)
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// we have to check it before body contents
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$view->readfilePart($filename, $rangeArray[0]['size'], $rangeArray[0]['size']);
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$type = \OC::$server->getMimeTypeDetector()->getSecureMimeType(\OC\Files\Filesystem::getMimeType($filename));
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foreach ($rangeArray as $range) {
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echo "\r\n--".self::getBoundary()."\r\n".
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"Content-type: ".$type."\r\n".
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"Content-range: bytes ".$range['from']."-".$range['to']."/".$range['size']."\r\n\r\n";
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$view->readfilePart($filename, $range['from'], $range['to']);
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}
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echo "\r\n--".self::getBoundary()."--\r\n";
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}
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} catch (\OCP\Files\UnseekableException $ex) {
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// file is unseekable
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header_remove('Accept-Ranges');
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header_remove('Content-Range');
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header("HTTP/1.1 200 OK");
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self::sendHeaders($filename, $name, array());
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$view->readfile($filename);
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}
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}
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else {
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$view->readfile($filename);
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}
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}
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/**
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* @param View $view
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* @param string $dir
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* @param string[]|string $files
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*/
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public static function lockFiles($view, $dir, $files) {
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if (!is_array($files)) {
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$file = $dir . '/' . $files;
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$files = [$file];
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}
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foreach ($files as $file) {
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$file = $dir . '/' . $file;
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$view->lockFile($file, ILockingProvider::LOCK_SHARED);
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if ($view->is_dir($file)) {
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$contents = $view->getDirectoryContent($file);
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$contents = array_map(function($fileInfo) use ($file) {
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/** @var \OCP\Files\FileInfo $fileInfo */
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return $file . '/' . $fileInfo->getName();
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}, $contents);
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self::lockFiles($view, $dir, $contents);
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}
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}
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}
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/**
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* set the maximum upload size limit for apache hosts using .htaccess
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*
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* @param int $size file size in bytes
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* @param array $files override '.htaccess' and '.user.ini' locations
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* @return bool|int false on failure, size on success
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*/
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public static function setUploadLimit($size, $files = []) {
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//don't allow user to break his config
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$size = intval($size);
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if ($size < self::UPLOAD_MIN_LIMIT_BYTES) {
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return false;
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}
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$size = OC_Helper::phpFileSize($size);
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$phpValueKeys = array(
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'upload_max_filesize',
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'post_max_size'
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);
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// default locations if not overridden by $files
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$files = array_merge([
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'.htaccess' => OC::$SERVERROOT . '/.htaccess',
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'.user.ini' => OC::$SERVERROOT . '/.user.ini'
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], $files);
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$updateFiles = [
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$files['.htaccess'] => [
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'pattern' => '/php_value %1$s (\S)*/',
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'setting' => 'php_value %1$s %2$s'
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],
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$files['.user.ini'] => [
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'pattern' => '/%1$s=(\S)*/',
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'setting' => '%1$s=%2$s'
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]
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];
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$success = true;
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foreach ($updateFiles as $filename => $patternMap) {
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// suppress warnings from fopen()
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$handle = @fopen($filename, 'r+');
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if (!$handle) {
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\OCP\Util::writeLog('files',
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'Can\'t write upload limit to ' . $filename . '. Please check the file permissions',
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\OCP\Util::WARN);
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$success = false;
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continue; // try to update as many files as possible
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}
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$content = '';
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while (!feof($handle)) {
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$content .= fread($handle, 1000);
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}
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foreach ($phpValueKeys as $key) {
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$pattern = vsprintf($patternMap['pattern'], [$key]);
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$setting = vsprintf($patternMap['setting'], [$key, $size]);
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$hasReplaced = 0;
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$newContent = preg_replace($pattern, $setting, $content, 2, $hasReplaced);
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if ($newContent !== null) {
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$content = $newContent;
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}
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if ($hasReplaced === 0) {
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$content .= "\n" . $setting;
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}
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}
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// write file back
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ftruncate($handle, 0);
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rewind($handle);
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fwrite($handle, $content);
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fclose($handle);
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}
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if ($success) {
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return OC_Helper::computerFileSize($size);
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}
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return false;
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}
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/**
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* @param string $dir
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* @param $files
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* @param integer $getType
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* @param View $view
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* @param string $filename
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*/
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private static function unlockAllTheFiles($dir, $files, $getType, $view, $filename) {
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if ($getType === self::FILE) {
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$view->unlockFile($filename, ILockingProvider::LOCK_SHARED);
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}
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if ($getType === self::ZIP_FILES) {
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foreach ($files as $file) {
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$file = $dir . '/' . $file;
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$view->unlockFile($file, ILockingProvider::LOCK_SHARED);
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}
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}
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if ($getType === self::ZIP_DIR) {
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$file = $dir . '/' . $files;
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$view->unlockFile($file, ILockingProvider::LOCK_SHARED);
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}
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}
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}
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