nextcloud/lib/private/files.php

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<?php
/**
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* @author Andreas Fischer <bantu@owncloud.com>
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* @author Arthur Schiwon <blizzz@owncloud.com>
* @author Bart Visscher <bartv@thisnet.nl>
* @author Björn Schießle <schiessle@owncloud.com>
* @author dratini0 <dratini0@gmail.com>
* @author Frank Karlitschek <frank@owncloud.org>
* @author Jakob Sack <mail@jakobsack.de>
* @author Joas Schilling <nickvergessen@owncloud.com>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Lukas Reschke <lukas@owncloud.com>
* @author Michael Gapczynski <GapczynskiM@gmail.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author mvn23 <schopdiedwaas@gmail.com>
* @author Nicolai Ehemann <en@enlightened.de>
* @author Robin Appelman <icewind@owncloud.com>
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* @author Robin McCorkell <rmccorkell@karoshi.org.uk>
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* @author Scrutinizer Auto-Fixer <auto-fixer@scrutinizer-ci.com>
* @author Thibaut GRIDEL <tgridel@free.fr>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Valerio Ponte <valerio.ponte@gmail.com>
* @author Vincent Petry <pvince81@owncloud.com>
* @author Robin McCorkell <rmccorkell@karoshi.org.uk>
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*
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* @copyright Copyright (c) 2015, ownCloud, Inc.
* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* 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
* 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,
* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
*/
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// TODO: get rid of this using proper composer packages
require_once 'mcnetic/phpzipstreamer/ZipStreamer.php';
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use OC\Lock\NoopLockingProvider;
use OCP\Lock\ILockingProvider;
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/**
* Class for file server access
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*
*/
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class OC_Files {
const FILE = 1;
const ZIP_FILES = 2;
const ZIP_DIR = 3;
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const UPLOAD_MIN_LIMIT_BYTES = 1048576; // 1 MiB
/**
* @param string $filename
* @param string $name
* @param bool $zip
*/
private static function sendHeaders($filename, $name, $zip = false) {
OC_Response::setContentDispositionHeader($name, 'attachment');
header('Content-Transfer-Encoding: binary');
OC_Response::disableCaching();
if ($zip) {
header('Content-Type: application/zip');
} else {
$filesize = \OC\Files\Filesystem::filesize($filename);
header('Content-Type: '.\OC_Helper::getSecureMimeType(\OC\Files\Filesystem::getMimeType($filename)));
if ($filesize > -1) {
OC_Response::setContentLengthHeader($filesize);
}
}
}
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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
* @param string $files ; separated list of files to download
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* @param boolean $only_header ; boolean to only send header of the request
*/
public static function get($dir, $files, $only_header = false) {
$view = \OC\Files\Filesystem::getView();
$xsendfile = false;
if (\OC::$server->getLockingProvider() instanceof NoopLockingProvider) {
if (isset($_SERVER['MOD_X_SENDFILE_ENABLED']) ||
isset($_SERVER['MOD_X_SENDFILE2_ENABLED']) ||
isset($_SERVER['MOD_X_ACCEL_REDIRECT_ENABLED'])
) {
$xsendfile = true;
}
}
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if (is_array($files) && count($files) === 1) {
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$files = $files[0];
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}
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if (is_array($files)) {
$get_type = self::ZIP_FILES;
$basename = basename($dir);
if ($basename) {
$name = $basename . '.zip';
} else {
$name = 'download.zip';
}
$filename = $dir . '/' . $name;
} else {
$filename = $dir . '/' . $files;
if (\OC\Files\Filesystem::is_dir($dir . '/' . $files)) {
$get_type = self::ZIP_DIR;
// downloading root ?
if ($files === '') {
$name = 'download.zip';
} else {
$name = $files . '.zip';
}
} else {
$get_type = self::FILE;
$name = $files;
}
}
if ($get_type === self::FILE) {
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$zip = false;
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if ($xsendfile && \OC::$server->getEncryptionManager()->isEnabled()) {
$xsendfile = false;
}
} else {
$zip = new ZipStreamer(false);
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}
OC_Util::obEnd();
try {
if ($get_type === self::FILE) {
$view->lockFile($filename, ILockingProvider::LOCK_SHARED);
}
if ($zip or \OC\Files\Filesystem::isReadable($filename)) {
self::sendHeaders($filename, $name, $zip);
} elseif (!\OC\Files\Filesystem::file_exists($filename)) {
header("HTTP/1.0 404 Not Found");
$tmpl = new OC_Template('', '404', 'guest');
$tmpl->printPage();
exit();
} else {
header("HTTP/1.0 403 Forbidden");
die('403 Forbidden');
}
if ($only_header) {
return;
}
if ($zip) {
$executionTime = intval(ini_get('max_execution_time'));
set_time_limit(0);
if ($get_type === self::ZIP_FILES) {
foreach ($files as $file) {
$file = $dir . '/' . $file;
if (\OC\Files\Filesystem::is_file($file)) {
$fh = \OC\Files\Filesystem::fopen($file, 'r');
$zip->addFileFromStream($fh, basename($file));
fclose($fh);
} elseif (\OC\Files\Filesystem::is_dir($file)) {
self::zipAddDir($file, $zip);
}
}
} elseif ($get_type === self::ZIP_DIR) {
$file = $dir . '/' . $files;
self::zipAddDir($file, $zip);
}
$zip->finalize();
set_time_limit($executionTime);
} else {
if ($xsendfile) {
/** @var $storage \OC\Files\Storage\Storage */
list($storage) = $view->resolvePath($filename);
if ($storage->isLocal()) {
self::addSendfileHeader($filename);
} else {
\OC\Files\Filesystem::readfile($filename);
}
} else {
\OC\Files\Filesystem::readfile($filename);
}
}
if ($get_type === self::FILE) {
$view->unlockFile($filename, ILockingProvider::LOCK_SHARED);
}
} catch (\OCP\Lock\LockedException $ex) {
$l = \OC::$server->getL10N('core');
$hint = method_exists($ex, 'getHint') ? $ex->getHint() : '';
\OC_Template::printErrorPage($l->t('File is currently busy, please try again later'), $hint);
} catch (\Exception $ex) {
$l = \OC::$server->getL10N('core');
$hint = method_exists($ex, 'getHint') ? $ex->getHint() : '';
\OC_Template::printErrorPage($l->t('Can\'t read file'), $hint);
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}
}
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/**
* @param false|string $filename
*/
private static function addSendfileHeader($filename) {
if (isset($_SERVER['MOD_X_SENDFILE_ENABLED'])) {
$filename = \OC\Files\Filesystem::getLocalFile($filename);
header("X-Sendfile: " . $filename);
}
if (isset($_SERVER['MOD_X_SENDFILE2_ENABLED'])) {
$filename = \OC\Files\Filesystem::getLocalFile($filename);
if (isset($_SERVER['HTTP_RANGE']) &&
preg_match("/^bytes=([0-9]+)-([0-9]*)$/", $_SERVER['HTTP_RANGE'], $range)) {
$filelength = filesize($filename);
if ($range[2] === "") {
$range[2] = $filelength - 1;
}
header("Content-Range: bytes $range[1]-$range[2]/" . $filelength);
header("HTTP/1.1 206 Partial content");
header("X-Sendfile2: " . str_replace(",", "%2c", rawurlencode($filename)) . " $range[1]-$range[2]");
} else {
header("X-Sendfile: " . $filename);
}
}
if (isset($_SERVER['MOD_X_ACCEL_REDIRECT_ENABLED'])) {
if (isset($_SERVER['MOD_X_ACCEL_REDIRECT_PREFIX'])) {
$filename = $_SERVER['MOD_X_ACCEL_REDIRECT_PREFIX'] . \OC\Files\Filesystem::getLocalFile($filename);
} else {
$filename = \OC::$WEBROOT . '/data' . \OC\Files\Filesystem::getRoot() . $filename;
}
header("X-Accel-Redirect: " . $filename);
}
}
/**
* @param string $dir
* @param ZipStreamer $zip
* @param string $internalDir
*/
public static function zipAddDir($dir, ZipStreamer $zip, $internalDir='') {
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$dirname=basename($dir);
$rootDir = $internalDir.$dirname;
if (!empty($rootDir)) {
$zip->addEmptyDir($rootDir);
}
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$internalDir.=$dirname.='/';
// prevent absolute dirs
$internalDir = ltrim($internalDir, '/');
$files=\OC\Files\Filesystem::getDirectoryContent($dir);
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foreach($files as $file) {
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$filename=$file['name'];
$file=$dir.'/'.$filename;
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if(\OC\Files\Filesystem::is_file($file)) {
$fh = \OC\Files\Filesystem::fopen($file, 'r');
$zip->addFileFromStream($fh, $internalDir.$filename);
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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/**
* set the maximum upload size limit for apache hosts using .htaccess
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*
* @param int $size file size in bytes
* @return bool false on failure, size on success
*/
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static function setUploadLimit($size) {
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//don't allow user to break his config
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if ($size > PHP_INT_MAX) {
//max size is always 1 byte lower than computerFileSize returns
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if ($size > PHP_INT_MAX + 1)
return false;
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$size -= 1;
}
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if ($size < self::UPLOAD_MIN_LIMIT_BYTES) {
return false;
}
$size = OC_Helper::phpFileSize($size);
//don't allow user to break his config -- broken or malicious size input
if (intval($size) === 0) {
return false;
}
$phpValueKeys = array(
'upload_max_filesize',
'post_max_size'
);
$updateFiles = [
OC::$SERVERROOT . '/.htaccess' => [
'pattern' => '/php_value %1$s (\S)*/',
'setting' => 'php_value %1$s %2$s'
],
OC::$SERVERROOT . '/.user.ini' => [
'pattern' => '/%1$s=(\S)*/',
'setting' => '%1$s=%2$s'
]
];
$success = true;
foreach ($updateFiles as $filename => $patternMap) {
// suppress warnings from fopen()
$handle = @fopen($filename, 'r+');
if (!$handle) {
\OCP\Util::writeLog('files',
'Can\'t write upload limit to ' . $filename . '. Please check the file permissions',
\OCP\Util::WARN);
$success = false;
continue; // try to update as many files as possible
}
$content = '';
while (!feof($handle)) {
$content .= fread($handle, 1000);
}
foreach ($phpValueKeys as $key) {
$pattern = vsprintf($patternMap['pattern'], [$key]);
$setting = vsprintf($patternMap['setting'], [$key, $size]);
$hasReplaced = 0;
$newContent = preg_replace($pattern, $setting, $content, 1, $hasReplaced);
if ($newContent !== null) {
$content = $newContent;
}
if ($hasReplaced === 0) {
$content .= "\n" . $setting;
}
}
// write file back
ftruncate($handle, 0);
rewind($handle);
fwrite($handle, $content);
fclose($handle);
}
if ($success) {
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return OC_Helper::computerFileSize($size);
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}
return false;
}
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}