328 lines
9.2 KiB
PHP
328 lines
9.2 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Frank Karlitschek
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* @copyright 2012 Frank Karlitschek frank@owncloud.org
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library 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
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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// TODO: get rid of this using proper composer packages
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require_once 'mcnetic/phpzipstreamer/ZipStreamer.php';
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class GET_TYPE {
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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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}
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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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/**
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* @param string $filename
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* @param string $name
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* @param bool $zip
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*/
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private static function sendHeaders($filename, $name, $zip = false) {
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OC_Response::setContentDispositionHeader($name, 'attachment');
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header('Content-Transfer-Encoding: binary');
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OC_Response::disableCaching();
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if ($zip) {
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header('Content-Type: application/zip');
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} else {
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$filesize = \OC\Files\Filesystem::filesize($filename);
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header('Content-Type: '.\OC\Files\Filesystem::getMimeType($filename));
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if ($filesize > -1) {
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header("Content-Length: ".$filesize);
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}
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}
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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 boolean $only_header ; boolean to only send header of the request
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*/
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public static function get($dir, $files, $only_header = false) {
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$xsendfile = false;
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if (isset($_SERVER['MOD_X_SENDFILE_ENABLED']) ||
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isset($_SERVER['MOD_X_SENDFILE2_ENABLED']) ||
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isset($_SERVER['MOD_X_ACCEL_REDIRECT_ENABLED'])) {
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$xsendfile = true;
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}
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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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$get_type = GET_TYPE::ZIP_FILES;
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$basename = basename($dir);
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if ($basename) {
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$name = $basename . '.zip';
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} else {
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$name = 'download.zip';
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}
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$filename = $dir . '/' . $name;
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} else {
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$filename = $dir . '/' . $files;
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if (\OC\Files\Filesystem::is_dir($dir . '/' . $files)) {
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$get_type = GET_TYPE::ZIP_DIR;
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// downloading root ?
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if ($files === '') {
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$name = 'download.zip';
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} else {
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$name = $files . '.zip';
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}
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} else {
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$get_type = GET_TYPE::FILE;
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$name = $files;
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}
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}
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if ($get_type === GET_TYPE::FILE) {
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$zip = false;
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if ($xsendfile && OC_App::isEnabled('files_encryption')) {
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$xsendfile = false;
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}
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} else {
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self::validateZipDownload($dir, $files);
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$zip = new ZipStreamer(false);
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}
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OC_Util::obEnd();
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if ($zip or \OC\Files\Filesystem::isReadable($filename)) {
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self::sendHeaders($filename, $name, $zip);
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} elseif (!\OC\Files\Filesystem::file_exists($filename)) {
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header("HTTP/1.0 404 Not Found");
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$tmpl = new OC_Template('', '404', 'guest');
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$tmpl->assign('file', $name);
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$tmpl->printPage();
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} else {
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header("HTTP/1.0 403 Forbidden");
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die('403 Forbidden');
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}
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if($only_header) {
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return ;
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}
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if ($zip) {
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$executionTime = intval(ini_get('max_execution_time'));
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set_time_limit(0);
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if ($get_type === GET_TYPE::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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$fh = \OC\Files\Filesystem::fopen($file, 'r');
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$zip->addFileFromStream($fh, basename($file));
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fclose($fh);
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} elseif (\OC\Files\Filesystem::is_dir($file)) {
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self::zipAddDir($file, $zip);
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}
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}
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} elseif ($get_type === GET_TYPE::ZIP_DIR) {
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$file = $dir . '/' . $files;
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self::zipAddDir($file, $zip);
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}
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$zip->finalize();
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set_time_limit($executionTime);
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} else {
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if ($xsendfile) {
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/** @var $storage \OC\Files\Storage\Storage */
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list($storage) = \OC\Files\Filesystem::resolvePath($filename);
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if ($storage->isLocal()) {
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self::addSendfileHeader(\OC\Files\Filesystem::getLocalFile($filename));
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} else {
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\OC\Files\Filesystem::readfile($filename);
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}
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} else {
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\OC\Files\Filesystem::readfile($filename);
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}
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}
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}
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/**
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* @param false|string $filename
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*/
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private static function addSendfileHeader($filename) {
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if (isset($_SERVER['MOD_X_SENDFILE_ENABLED'])) {
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header("X-Sendfile: " . $filename);
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}
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if (isset($_SERVER['MOD_X_SENDFILE2_ENABLED'])) {
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if (isset($_SERVER['HTTP_RANGE']) &&
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preg_match("/^bytes=([0-9]+)-([0-9]*)$/", $_SERVER['HTTP_RANGE'], $range)) {
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$filelength = filesize($filename);
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if ($range[2] === "") {
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$range[2] = $filelength - 1;
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}
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header("Content-Range: bytes $range[1]-$range[2]/" . $filelength);
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header("HTTP/1.1 206 Partial content");
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header("X-Sendfile2: " . str_replace(",", "%2c", rawurlencode($filename)) . " $range[1]-$range[2]");
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} else {
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header("X-Sendfile: " . $filename);
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}
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}
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if (isset($_SERVER['MOD_X_ACCEL_REDIRECT_ENABLED'])) {
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header("X-Accel-Redirect: " . $filename);
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}
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}
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/**
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* @param string $dir
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* @param ZipStreamer $zip
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* @param string $internalDir
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*/
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public static function zipAddDir($dir, $zip, $internalDir='') {
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$dirname=basename($dir);
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$rootDir = $internalDir.$dirname;
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if (!empty($rootDir)) {
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$zip->addEmptyDir($rootDir);
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}
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$internalDir.=$dirname.='/';
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// prevent absolute dirs
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$internalDir = ltrim($internalDir, '/');
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$files=\OC\Files\Filesystem::getDirectoryContent($dir);
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foreach($files as $file) {
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$filename=$file['name'];
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$file=$dir.'/'.$filename;
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if(\OC\Files\Filesystem::is_file($file)) {
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$fh = \OC\Files\Filesystem::fopen($file, 'r');
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$zip->addFileFromStream($fh, $internalDir.$filename);
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fclose($fh);
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}elseif(\OC\Files\Filesystem::is_dir($file)) {
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self::zipAddDir($file, $zip, $internalDir);
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}
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}
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}
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/**
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* checks if the selected files are within the size constraint. If not, outputs an error page.
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*
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* @param string $dir
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* @param array | string $files
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*/
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static function validateZipDownload($dir, $files) {
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if (!OC_Config::getValue('allowZipDownload', true)) {
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$l = OC_L10N::get('lib');
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header("HTTP/1.0 409 Conflict");
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OC_Template::printErrorPage(
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$l->t('ZIP download is turned off.'),
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$l->t('Files need to be downloaded one by one.')
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. '<br/><a href="javascript:history.back()">' . $l->t('Back to Files') . '</a>'
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);
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exit;
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}
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$zipLimit = OC_Config::getValue('maxZipInputSize', OC_Helper::computerFileSize('800 MB'));
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if ($zipLimit > 0) {
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$totalsize = 0;
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if(!is_array($files)) {
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$files = array($files);
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}
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foreach ($files as $file) {
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$path = $dir . '/' . $file;
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if(\OC\Files\Filesystem::is_dir($path)) {
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foreach (\OC\Files\Filesystem::getDirectoryContent($path) as $i) {
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$totalsize += $i['size'];
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}
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} else {
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$totalsize += \OC\Files\Filesystem::filesize($path);
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}
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}
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if ($totalsize > $zipLimit) {
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$l = OC_L10N::get('lib');
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header("HTTP/1.0 409 Conflict");
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OC_Template::printErrorPage(
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$l->t('Selected files too large to generate zip file.'),
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$l->t('Please download the files separately in smaller chunks or kindly ask your administrator.')
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.'<br/><a href="javascript:history.back()">'
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. $l->t('Back to Files') . '</a>'
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);
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exit;
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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 $size file size in bytes
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* @return bool false on failure, size on success
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*/
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static function setUploadLimit($size) {
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//don't allow user to break his config -- upper boundary
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if ($size > PHP_INT_MAX) {
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//max size is always 1 byte lower than computerFileSize returns
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if ($size > PHP_INT_MAX + 1)
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return false;
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$size -= 1;
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} else {
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$size = OC_Helper::humanFileSize($size);
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$size = substr($size, 0, -1); //strip the B
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$size = str_replace(' ', '', $size); //remove the space between the size and the postfix
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}
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//don't allow user to break his config -- broken or malicious size input
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if (intval($size) === 0) {
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return false;
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}
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//suppress errors in case we don't have permissions for
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$htaccess = @file_get_contents(OC::$SERVERROOT . '/.htaccess');
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if (!$htaccess) {
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return false;
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}
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$phpValueKeys = array(
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'upload_max_filesize',
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'post_max_size'
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);
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foreach ($phpValueKeys as $key) {
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$pattern = '/php_value ' . $key . ' (\S)*/';
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$setting = 'php_value ' . $key . ' ' . $size;
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$hasReplaced = 0;
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$content = preg_replace($pattern, $setting, $htaccess, 1, $hasReplaced);
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if ($content !== null) {
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$htaccess = $content;
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}
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if ($hasReplaced === 0) {
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$htaccess .= "\n" . $setting;
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}
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}
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//check for write permissions
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if (is_writable(OC::$SERVERROOT . '/.htaccess')) {
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file_put_contents(OC::$SERVERROOT . '/.htaccess', $htaccess);
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return OC_Helper::computerFileSize($size);
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} else {
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OC_Log::write('files',
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'Can\'t write upload limit to ' . OC::$SERVERROOT . '/.htaccess. Please check the file permissions',
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OC_Log::WARN);
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}
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return false;
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}
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}
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