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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
* @author Bart Visscher <bartv@thisnet.nl>
* @author Björn Schießle <bjoern@schiessle.org>
* @author Clark Tomlinson <fallen013@gmail.com>
* @author Frank Karlitschek <frank@karlitschek.de>
* @author Jakob Sack <mail@jakobsack.de>
* @author Joas Schilling <coding@schilljs.com>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Ko- <k.stoffelen@cs.ru.nl>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Michael Gapczynski <GapczynskiM@gmail.com>
* @author Nicolai Ehemann <en@enlightened.de>
* @author noveens <noveen.sachdeva@research.iiit.ac.in>
* @author Piotr Filiciak <piotr@filiciak.pl>
* @author Robin Appelman <robin@icewind.nl>
* @author Robin McCorkell <robin@mccorkell.me.uk>
* @author Thibaut GRIDEL <tgridel@free.fr>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Victor Dubiniuk <dubiniuk@owncloud.com>
* @author Vincent Petry <pvince81@owncloud.com>
*
* @license AGPL-3.0
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* 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/>
*
*/
use OC\Files\View;
use OC\Streamer;
use OCP\Lock\ILockingProvider;
/**
* Class for file server access
*
*/
class OC_Files {
const FILE = 1;
const ZIP_FILES = 2;
const ZIP_DIR = 3;
const UPLOAD_MIN_LIMIT_BYTES = 1048576; // 1 MiB
private static $multipartBoundary = '';
/**
* @return string
*/
private static function getBoundary() {
if (empty(self::$multipartBoundary)) {
self::$multipartBoundary = md5(mt_rand());
}
return self::$multipartBoundary;
}
/**
* @param string $filename
* @param string $name
* @param array $rangeArray ('from'=>int,'to'=>int), ...
*/
private static function sendHeaders($filename, $name, array $rangeArray) {
OC_Response::setContentDispositionHeader($name, 'attachment');
header('Content-Transfer-Encoding: binary', true);
OC_Response::disableCaching();
$fileSize = \OC\Files\Filesystem::filesize($filename);
$type = \OC::$server->getMimeTypeDetector()->getSecureMimeType(\OC\Files\Filesystem::getMimeType($filename));
if ($fileSize > -1) {
if (!empty($rangeArray)) {
header('HTTP/1.1 206 Partial Content', true);
header('Accept-Ranges: bytes', true);
if (count($rangeArray) > 1) {
$type = 'multipart/byteranges; boundary='.self::getBoundary();
// no Content-Length header here
}
else {
header(sprintf('Content-Range: bytes %d-%d/%d', $rangeArray[0]['from'], $rangeArray[0]['to'], $fileSize), true);
OC_Response::setContentLengthHeader($rangeArray[0]['to'] - $rangeArray[0]['from'] + 1);
}
}
else {
OC_Response::setContentLengthHeader($fileSize);
}
}
header('Content-Type: '.$type, true);
}
/**
* return the content of a file or return a zip file containing multiple files
*
* @param string $dir
* @param string $files ; separated list of files to download
* @param array $params ; 'head' boolean to only send header of the request ; 'range' http range header
*/
public static function get($dir, $files, $params = null) {
$view = \OC\Files\Filesystem::getView();
$getType = self::FILE;
$filename = $dir;
try {
if (is_array($files) && count($files) === 1) {
$files = $files[0];
}
if (!is_array($files)) {
$filename = $dir . '/' . $files;
if (!$view->is_dir($filename)) {
self::getSingleFile($view, $dir, $files, is_null($params) ? array() : $params);
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;
$getType = self::ZIP_DIR;
// downloading root ?
if ($files !== '') {
$name = $files;
}
}
$streamer = new Streamer();
OC_Util::obEnd();
self::lockFiles($view, $dir, $files);
$streamer->sendHeaders($name);
$executionTime = intval(OC::$server->getIniWrapper()->getNumeric('max_execution_time'));
if (strpos(@ini_get('disable_functions'), 'set_time_limit') === false) {
@set_time_limit(0);
}
ignore_user_abort(true);
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);
$fileTime = \OC\Files\Filesystem::filemtime($file);
$fh = \OC\Files\Filesystem::fopen($file, 'r');
$streamer->addFileFromStream($fh, basename($file), $fileSize, $fileTime);
fclose($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);
self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
} catch (\OCP\Lock\LockedException $ex) {
self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
OC::$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 $ex) {
self::unlockAllTheFiles($dir, $files, $getType, $view, $filename);
OC::$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);
}
}
/**
* @param string $rangeHeaderPos
* @param int $fileSize
* @return array $rangeArray ('from'=>int,'to'=>int), ...
*/
private static function parseHttpRangeHeader($rangeHeaderPos, $fileSize) {
$rArray=explode(',', $rangeHeaderPos);
$minOffset = 0;
$ind = 0;
$rangeArray = array();
foreach ($rArray as $value) {
$ranges = explode('-', $value);
if (is_numeric($ranges[0])) {
if ($ranges[0] < $minOffset) { // case: bytes=500-700,601-999
$ranges[0] = $minOffset;
}
if ($ind > 0 && $rangeArray[$ind-1]['to']+1 == $ranges[0]) { // case: bytes=500-600,601-999
$ind--;
$ranges[0] = $rangeArray[$ind]['from'];
}
}
if (is_numeric($ranges[0]) && is_numeric($ranges[1]) && $ranges[0] < $fileSize && $ranges[0] <= $ranges[1]) {
// case: x-x
if ($ranges[1] >= $fileSize) {
$ranges[1] = $fileSize-1;
}
$rangeArray[$ind++] = array( 'from' => $ranges[0], 'to' => $ranges[1], 'size' => $fileSize );
$minOffset = $ranges[1] + 1;
if ($minOffset >= $fileSize) {
break;
}
}
elseif (is_numeric($ranges[0]) && $ranges[0] < $fileSize) {
// case: x-
$rangeArray[$ind++] = array( 'from' => $ranges[0], 'to' => $fileSize-1, 'size' => $fileSize );
break;
}
elseif (is_numeric($ranges[1])) {
// case: -x
if ($ranges[1] > $fileSize) {
$ranges[1] = $fileSize;
}
$rangeArray[$ind++] = array( 'from' => $fileSize-$ranges[1], 'to' => $fileSize-1, 'size' => $fileSize );
break;
}
}
return $rangeArray;
}
/**
* @param View $view
* @param string $name
* @param string $dir
* @param array $params ; 'head' boolean to only send header of the request ; 'range' http range header
*/
private static function getSingleFile($view, $dir, $name, $params) {
$filename = $dir . '/' . $name;
OC_Util::obEnd();
$view->lockFile($filename, ILockingProvider::LOCK_SHARED);
$rangeArray = array();
if (isset($params['range']) && substr($params['range'], 0, 6) === 'bytes=') {
$rangeArray = self::parseHttpRangeHeader(substr($params['range'], 6),
\OC\Files\Filesystem::filesize($filename));
}
if (\OC\Files\Filesystem::isReadable($filename)) {
self::sendHeaders($filename, $name, $rangeArray);
} elseif (!\OC\Files\Filesystem::file_exists($filename)) {
header("HTTP/1.1 404 Not Found");
$tmpl = new OC_Template('', '404', 'guest');
$tmpl->printPage();
exit();
} else {
header("HTTP/1.1 403 Forbidden");
die('403 Forbidden');
}
if (isset($params['head']) && $params['head']) {
return;
}
if (!empty($rangeArray)) {
try {
if (count($rangeArray) == 1) {
$view->readfilePart($filename, $rangeArray[0]['from'], $rangeArray[0]['to']);
}
else {
// check if file is seekable (if not throw UnseekableException)
// we have to check it before body contents
$view->readfilePart($filename, $rangeArray[0]['size'], $rangeArray[0]['size']);
$type = \OC::$server->getMimeTypeDetector()->getSecureMimeType(\OC\Files\Filesystem::getMimeType($filename));
foreach ($rangeArray as $range) {
echo "\r\n--".self::getBoundary()."\r\n".
"Content-type: ".$type."\r\n".
"Content-range: bytes ".$range['from']."-".$range['to']."/".$range['size']."\r\n\r\n";
$view->readfilePart($filename, $range['from'], $range['to']);
}
echo "\r\n--".self::getBoundary()."--\r\n";
}
} catch (\OCP\Files\UnseekableException $ex) {
// file is unseekable
header_remove('Accept-Ranges');
header_remove('Content-Range');
header("HTTP/1.1 200 OK");
self::sendHeaders($filename, $name, array());
$view->readfile($filename);
}
}
else {
$view->readfile($filename);
}
}
/**
* @param View $view
* @param string $dir
* @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
*
* @param int $size file size in bytes
* @param array $files override '.htaccess' and '.user.ini' locations
* @return bool|int false on failure, size on success
*/
public static function setUploadLimit($size, $files = []) {
//don't allow user to break his config
$size = intval($size);
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, 2, $hasReplaced);
if ($newContent !== null) {
$content = $newContent;
}
if ($hasReplaced === 0) {
$content .= "\n" . $setting;
}
}
// write file back
ftruncate($handle, 0);
rewind($handle);
fwrite($handle, $content);
fclose($handle);
}
if ($success) {
return OC_Helper::computerFileSize($size);
}
return false;
}
/**
* @param string $dir
* @param $files
* @param integer $getType
* @param View $view
* @param string $filename
*/
private static function unlockAllTheFiles($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);
}
}
}