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<?php
/**
* ownCloud
*
* @author Frank Karlitschek
* @copyright 2012 Frank Karlitschek frank@owncloud.org
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library 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 along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
* Class for fileserver access
*
*/
class OC_Files {
static $tmpFiles = array();
static public function getFileInfo($path){
return \OC\Files\Filesystem::getFileInfo($path);
}
static public function getDirectoryContent($path){
return \OC\Files\Filesystem::getDirectoryContent($path);
}
/**
* return the content of a file or return a zip file containing multiple files
*
* @param string $dir
* @param string $file ; separated list of files to download
* @param boolean $only_header ; boolean to only send header of the request
*/
public static function get($dir, $files, $only_header = false) {
$xsendfile = false;
if (isset($_SERVER['MOD_X_SENDFILE_ENABLED']) ||
isset($_SERVER['MOD_X_ACCEL_REDIRECT_ENABLED'])) {
$xsendfile = true;
}
if(strpos($files, ';')) {
$files=explode(';', $files);
}
if (is_array($files)) {
self::validateZipDownload($dir, $files);
$executionTime = intval(ini_get('max_execution_time'));
set_time_limit(0);
$zip = new ZipArchive();
if ($xsendfile) {
$filename = OC_Helper::tmpFileNoClean('.zip');
}else{
$filename = OC_Helper::tmpFile('.zip');
}
if ($zip->open($filename, ZIPARCHIVE::CREATE | ZIPARCHIVE::OVERWRITE)!==true) {
exit("cannot open <$filename>\n");
}
foreach ($files as $file) {
$file = $dir . '/' . $file;
if (\OC\Files\Filesystem::is_file($file)) {
$tmpFile = \OC\Files\Filesystem::toTmpFile($file);
self::$tmpFiles[] = $tmpFile;
$zip->addFile($tmpFile, basename($file));
} elseif (\OC\Files\Filesystem::is_dir($file)) {
self::zipAddDir($file, $zip);
}
}
$zip->close();
$name = basename($dir) . '.zip';
set_time_limit($executionTime);
} elseif (\OC\Files\Filesystem::is_dir($dir . '/' . $files)) {
self::validateZipDownload($dir, $files);
$executionTime = intval(ini_get('max_execution_time'));
set_time_limit(0);
$zip = new ZipArchive();
if ($xsendfile) {
$filename = OC_Helper::tmpFileNoClean('.zip');
}else{
$filename = OC_Helper::tmpFile('.zip');
}
if ($zip->open($filename, ZIPARCHIVE::CREATE | ZIPARCHIVE::OVERWRITE)!==true) {
exit("cannot open <$filename>\n");
}
$file = $dir . '/' . $files;
self::zipAddDir($file, $zip);
$zip->close();
$name = $files . '.zip';
set_time_limit($executionTime);
} else {
$zip = false;
$filename = $dir . '/' . $files;
$name = $files;
}
OC_Util::obEnd();
if ($zip or \OC\Files\Filesystem::isReadable($filename)) {
if ( preg_match( "/MSIE/", $_SERVER["HTTP_USER_AGENT"] ) ) {
header( 'Content-Disposition: attachment; filename="' . rawurlencode($name) . '"' );
} else {
header( 'Content-Disposition: attachment; filename*=UTF-8\'\'' . rawurlencode($name)
. '; filename="' . rawurlencode($name) . '"' );
}
header('Content-Transfer-Encoding: binary');
OC_Response::disableCaching();
if ($zip) {
ini_set('zlib.output_compression', 'off');
header('Content-Type: application/zip');
header('Content-Length: ' . filesize($filename));
self::addSendfileHeader($filename);
}else{
header('Content-Type: '.\OC\Files\Filesystem::getMimeType($filename));
header("Content-Length: ".\OC\Files\Filesystem::filesize($filename));
list($storage) = \OC\Files\Filesystem::resolvePath($filename);
if ($storage instanceof \OC\File\Storage\Local) {
self::addSendfileHeader(\OC\Files\Filesystem::getLocalFile($filename));
}
}
} elseif ($zip or !\OC\Files\Filesystem::file_exists($filename)) {
header("HTTP/1.0 404 Not Found");
$tmpl = new OC_Template('', '404', 'guest');
$tmpl->assign('file', $name);
$tmpl->printPage();
} else {
header("HTTP/1.0 403 Forbidden");
die('403 Forbidden');
}
if($only_header) {
return ;
}
if ($zip) {
$handle = fopen($filename, 'r');
if ($handle) {
$chunkSize = 8 * 1024; // 1 MB chunks
while (!feof($handle)) {
echo fread($handle, $chunkSize);
flush();
}
}
if (!$xsendfile) {
unlink($filename);
}
}else{
\OC\Files\Filesystem::readfile($filename);
}
foreach (self::$tmpFiles as $tmpFile) {
if (file_exists($tmpFile) and is_file($tmpFile)) {
unlink($tmpFile);
}
}
}
private static function addSendfileHeader($filename) {
if (isset($_SERVER['MOD_X_SENDFILE_ENABLED'])) {
header("X-Sendfile: " . $filename);
}
if (isset($_SERVER['MOD_X_ACCEL_REDIRECT_ENABLED'])) {
header("X-Accel-Redirect: " . $filename);
}
}
public static function zipAddDir($dir, $zip, $internalDir='') {
$dirname=basename($dir);
$zip->addEmptyDir($internalDir.$dirname);
$internalDir.=$dirname.='/';
$files=OC_Files::getDirectoryContent($dir);
foreach($files as $file) {
$filename=$file['name'];
$file=$dir.'/'.$filename;
if(\OC\Files\Filesystem::is_file($file)) {
$tmpFile=\OC\Files\Filesystem::toTmpFile($file);
OC_Files::$tmpFiles[]=$tmpFile;
$zip->addFile($tmpFile, $internalDir.$filename);
}elseif(\OC\Files\Filesystem::is_dir($file)) {
self::zipAddDir($file, $zip, $internalDir);
}
}
}
/**
* checks if the selected files are within the size constraint. If not, outputs an error page.
*
* @param dir $dir
* @param files $files
*/
static function validateZipDownload($dir, $files) {
if (!OC_Config::getValue('allowZipDownload', true)) {
$l = OC_L10N::get('lib');
header("HTTP/1.0 409 Conflict");
$tmpl = new OC_Template('', 'error', 'user');
$errors = array(
array(
'error' => $l->t('ZIP download is turned off.'),
'hint' => $l->t('Files need to be downloaded one by one.') . '<br/><a href="javascript:history.back()">' . $l->t('Back to Files') . '</a>',
)
);
$tmpl->assign('errors', $errors);
$tmpl->printPage();
exit;
}
$zipLimit = OC_Config::getValue('maxZipInputSize', OC_Helper::computerFileSize('800 MB'));
if ($zipLimit > 0) {
$totalsize = 0;
if (is_array($files)) {
foreach ($files as $file) {
$totalsize += \OC\Files\Filesystem::filesize($dir . '/' . $file);
}
} else {
$totalsize += \OC\Files\Filesystem::filesize($dir . '/' . $files);
}
if ($totalsize > $zipLimit) {
$l = OC_L10N::get('lib');
header("HTTP/1.0 409 Conflict");
$tmpl = new OC_Template('', 'error', 'user');
$errors = array(
array(
'error' => $l->t('Selected files too large to generate zip file.'),
'hint' => 'Download the files in smaller chunks, seperately or kindly ask your administrator.<br/><a href="javascript:history.back()">' . $l->t('Back to Files') . '</a>',
)
);
$tmpl->assign('errors', $errors);
$tmpl->printPage();
exit;
}
}
}
/**
* set the maximum upload size limit for apache hosts using .htaccess
*
* @param int size filesisze in bytes
* @return false on failure, size on success
*/
static function setUploadLimit($size) {
//don't allow user to break his config -- upper boundary
if ($size > PHP_INT_MAX) {
//max size is always 1 byte lower than computerFileSize returns
if ($size > PHP_INT_MAX + 1)
return false;
$size -= 1;
} else {
$size = OC_Helper::humanFileSize($size);
$size = substr($size, 0, -1); //strip the B
$size = str_replace(' ', '', $size); //remove the space between the size and the postfix
}
//don't allow user to break his config -- broken or malicious size input
if (intval($size) == 0) {
return false;
}
$htaccess = @file_get_contents(OC::$SERVERROOT . '/.htaccess'); //supress errors in case we don't have permissions for
if (!$htaccess) {
return false;
}
$phpValueKeys = array(
'upload_max_filesize',
'post_max_size'
);
foreach ($phpValueKeys as $key) {
$pattern = '/php_value ' . $key . ' (\S)*/';
$setting = 'php_value ' . $key . ' ' . $size;
$hasReplaced = 0;
$content = preg_replace($pattern, $setting, $htaccess, 1, $hasReplaced);
if ($content !== null) {
$htaccess = $content;
}
if ($hasReplaced == 0) {
$htaccess .= "\n" . $setting;
}
}
//check for write permissions
if (is_writable(OC::$SERVERROOT . '/.htaccess')) {
file_put_contents(OC::$SERVERROOT . '/.htaccess', $htaccess);
return OC_Helper::computerFileSize($size);
} else {
OC_Log::write('files', 'Can\'t write upload limit to ' . OC::$SERVERROOT . '/.htaccess. Please check the file permissions', OC_Log::WARN);
}
return false;
}
}
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