nextcloud/lib/private/files.php

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<?php
/**
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* @author Arthur Schiwon <blizzz@owncloud.com>
* @author Bart Visscher <bartv@thisnet.nl>
* @author Björn Schießle <schiessle@owncloud.com>
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* @author Clark Tomlinson <fallen013@gmail.com>
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* @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 Michael Gapczynski <GapczynskiM@gmail.com>
* @author Nicolai Ehemann <en@enlightened.de>
* @author Robin Appelman <icewind@owncloud.com>
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* @author Robin McCorkell <robin@mccorkell.me.uk>
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* @author Thibaut GRIDEL <tgridel@free.fr>
* @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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* @copyright Copyright (c) 2016, ownCloud, Inc.
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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
* 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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use OC\Files\View;
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use OC\Streamer;
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 $name
*/
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private static function sendHeaders($filename, $name) {
OC_Response::setContentDispositionHeader($name, 'attachment');
header('Content-Transfer-Encoding: binary');
OC_Response::disableCaching();
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$fileSize = \OC\Files\Filesystem::filesize($filename);
$type = \OC::$server->getMimeTypeDetector()->getSecureMimeType(\OC\Files\Filesystem::getMimeType($filename));
header('Content-Type: '.$type);
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 $onlyHeader ; boolean to only send header of the request
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*/
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public static function get($dir, $files, $onlyHeader = false) {
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$view = \OC\Files\Filesystem::getView();
$getType = self::FILE;
$filename = $dir;
try {
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if (is_array($files) && count($files) === 1) {
$files = $files[0];
}
if (!is_array($files)) {
$filename = $dir . '/' . $files;
if (!$view->is_dir($filename)) {
self::getSingleFile($view, $dir, $files, $onlyHeader);
return;
}
}
$name = 'download';
if (is_array($files)) {
$getType = self::ZIP_FILES;
$basename = basename($dir);
if ($basename) {
$name = $basename;
}
$filename = $dir . '/' . $name;
} else {
$filename = $dir . '/' . $files;
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$getType = self::ZIP_DIR;
// downloading root ?
if ($files !== '') {
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$name = $files;
}
}
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$streamer = new Streamer();
OC_Util::obEnd();
self::lockFiles($view, $dir, $files);
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$streamer->sendHeaders($name);
$executionTime = intval(OC::$server->getIniWrapper()->getNumeric('max_execution_time'));
set_time_limit(0);
if ($getType === self::ZIP_FILES) {
foreach ($files as $file) {
$file = $dir . '/' . $file;
if (\OC\Files\Filesystem::is_file($file)) {
$fileSize = \OC\Files\Filesystem::filesize($file);
$fh = \OC\Files\Filesystem::fopen($file, 'r');
$streamer->addFileFromStream($fh, basename($file), $fileSize);
fclose($fh);
} elseif (\OC\Files\Filesystem::is_dir($file)) {
$streamer->addDirRecursive($file);
}
}
} elseif ($getType === self::ZIP_DIR) {
$file = $dir . '/' . $files;
$streamer->addDirRecursive($file);
}
$streamer->finalize();
set_time_limit($executionTime);
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self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
} 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);
$l = \OC::$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 (\OCP\Files\ForbiddenException $ex) {
self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
OC::$server->getLogger()->logException($ex);
$l = \OC::$server->getL10N('core');
\OC_Template::printErrorPage($l->t('Can\'t read file'), $ex->getMessage());
} catch (\Exception $ex) {
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self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
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OC::$server->getLogger()->logException($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 View $view
* @param string $name
* @param string $dir
* @param boolean $onlyHeader
*/
private static function getSingleFile($view, $dir, $name, $onlyHeader) {
$filename = $dir . '/' . $name;
OC_Util::obEnd();
$view->lockFile($filename, ILockingProvider::LOCK_SHARED);
if (\OC\Files\Filesystem::isReadable($filename)) {
self::sendHeaders($filename, $name);
} elseif (!\OC\Files\Filesystem::file_exists($filename)) {
header("HTTP/1.0 404 Not Found");
$tmpl = new OC_Template('', '404', 'guest');
$tmpl->printPage();
exit();
} else {
header("HTTP/1.0 403 Forbidden");
die('403 Forbidden');
}
if ($onlyHeader) {
return;
}
$view->readfile($filename);
}
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/**
* @param View $view
* @param string $dir
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* @param string[]|string $files
*/
public static function lockFiles($view, $dir, $files) {
if (!is_array($files)) {
$file = $dir . '/' . $files;
$files = [$file];
}
foreach ($files as $file) {
$file = $dir . '/' . $file;
$view->lockFile($file, ILockingProvider::LOCK_SHARED);
if ($view->is_dir($file)) {
$contents = $view->getDirectoryContent($file);
$contents = array_map(function($fileInfo) use ($file) {
/** @var \OCP\Files\FileInfo $fileInfo */
return $file . '/' . $fileInfo->getName();
}, $contents);
self::lockFiles($view, $dir, $contents);
}
}
}
/**
* set the maximum upload size limit for apache hosts using .htaccess
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*
* @param int $size file size in bytes
* @param array $files override '.htaccess' and '.user.ini' locations
* @return bool false on failure, size on success
*/
public static function setUploadLimit($size, $files = []) {
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//don't allow user to break his config
$size = intval($size);
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if ($size < self::UPLOAD_MIN_LIMIT_BYTES) {
return false;
}
$size = OC_Helper::phpFileSize($size);
$phpValueKeys = array(
'upload_max_filesize',
'post_max_size'
);
// default locations if not overridden by $files
$files = array_merge([
'.htaccess' => OC::$SERVERROOT . '/.htaccess',
'.user.ini' => OC::$SERVERROOT . '/.user.ini'
], $files);
$updateFiles = [
$files['.htaccess'] => [
'pattern' => '/php_value %1$s (\S)*/',
'setting' => 'php_value %1$s %2$s'
],
$files['.user.ini'] => [
'pattern' => '/%1$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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/**
* @param string $dir
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* @param $files
* @param integer $getType
* @param View $view
* @param string $filename
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*/
private static function unlockAllTheFiles($dir, $files, $getType, $view, $filename) {
if ($getType === self::FILE) {
$view->unlockFile($filename, ILockingProvider::LOCK_SHARED);
}
if ($getType === self::ZIP_FILES) {
foreach ($files as $file) {
$file = $dir . '/' . $file;
$view->unlockFile($file, ILockingProvider::LOCK_SHARED);
}
}
if ($getType === self::ZIP_DIR) {
$file = $dir . '/' . $files;
$view->unlockFile($file, ILockingProvider::LOCK_SHARED);
}
}
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}