nextcloud/lib/files.php

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<?php
/**
* ownCloud
*
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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
* 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,
* 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.
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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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*/
/**
* Class for fileserver access
*
*/
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class OC_Files {
static $tmpFiles=array();
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/**
* get the filesystem info
* @param string path
* @return array
*
* returns an associative array with the following keys:
* - size
* - mtime
* - ctime
* - mimetype
* - encrypted
* - versioned
*/
public static function getFileInfo($path) {
$path = OC_Filesystem::normalizePath($path);
if (($path == '/Shared' || substr($path, 0, 8) == '/Shared/') && OC_App::isEnabled('files_sharing')) {
if ($path == '/Shared') {
list($info) = OCP\Share::getItemsSharedWith('file', OC_Share_Backend_File::FORMAT_FILE_APP_ROOT);
} else {
$info = array();
if (OC_Filesystem::file_exists($path)) {
$info['size'] = OC_Filesystem::filesize($path);
$info['mtime'] = OC_Filesystem::filemtime($path);
$info['ctime'] = OC_Filesystem::filectime($path);
$info['mimetype'] = OC_Filesystem::getMimeType($path);
$info['encrypted'] = false;
$info['versioned'] = false;
}
}
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} else {
$info = OC_FileCache::get($path);
}
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return $info;
}
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/**
* get the content of a directory
* @param dir $directory path under datadirectory
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*/
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public static function getDirectoryContent($directory, $mimetype_filter = '') {
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$directory=OC_Filesystem::normalizePath($directory);
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if($directory=='/') {
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$directory='';
}
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$files = array();
if (($directory == '/Shared' || substr($directory, 0, 8) == '/Shared/') && OC_App::isEnabled('files_sharing')) {
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if ($directory == '/Shared') {
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$files = OCP\Share::getItemsSharedWith('file', OC_Share_Backend_File::FORMAT_FILE_APP, array('folder' => $directory, 'mimetype_filter' => $mimetype_filter));
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} else {
$pos = strpos($directory, '/', 8);
// Get shared folder name
if ($pos !== false) {
$itemTarget = substr($directory, 7, $pos - 7);
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} else {
$itemTarget = substr($directory, 7);
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}
$files = OCP\Share::getItemSharedWith('folder', $itemTarget, OC_Share_Backend_File::FORMAT_FILE_APP, array('folder' => $directory, 'mimetype_filter' => $mimetype_filter));
}
} else {
$files = OC_FileCache::getFolderContent($directory, false, $mimetype_filter);
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foreach ($files as &$file) {
$file['directory'] = $directory;
$file['type'] = ($file['mimetype'] == 'httpd/unix-directory') ? 'dir' : 'file';
$permissions = OCP\PERMISSION_READ;
// NOTE: Remove check when new encryption is merged
if (!$file['encrypted']) {
$permissions |= OCP\PERMISSION_SHARE;
}
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if ($file['type'] == 'dir' && $file['writable']) {
$permissions |= OCP\PERMISSION_CREATE;
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}
if ($file['writable']) {
$permissions |= OCP\PERMISSION_UPDATE | OCP\PERMISSION_DELETE;
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}
$file['permissions'] = $permissions;
}
if ($directory == '' && OC_App::isEnabled('files_sharing')) {
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// Add 'Shared' folder
$files = array_merge($files, OCP\Share::getItemsSharedWith('file', OC_Share_Backend_File::FORMAT_FILE_APP_ROOT));
}
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}
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usort($files, "fileCmp");//TODO: remove this once ajax is merged
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return $files;
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}
public static function searchByMime($mimetype_filter) {
$files = array();
$dirs_to_check = array('');
while (!empty($dirs_to_check)) {
// get next subdir to check
$dir = array_pop($dirs_to_check);
$dir_content = self::getDirectoryContent($dir, $mimetype_filter);
foreach($dir_content as $file) {
if ($file['type'] == 'file') {
$files[] = $dir.'/'.$file['name'];
}
else {
$dirs_to_check[] = $dir.'/'.$file['name'];
}
}
}
return $files;
}
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/**
* return the content of a file or return a zip file containning multiply files
*
* @param dir $dir
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* @param file $file ; seperated list of files to download
* @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) {
$xsendfile = false;
if (isset($_SERVER['MOD_X_SENDFILE_ENABLED']) ||
isset($_SERVER['MOD_X_ACCEL_REDIRECT_ENABLED'])) {
$xsendfile = true;
}
if(strpos($files, ';')) {
$files=explode(';', $files);
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}
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if(is_array($files)) {
self::validateZipDownload($dir, $files);
$executionTime = intval(ini_get('max_execution_time'));
set_time_limit(0);
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$zip = new ZipArchive();
if ($xsendfile) {
$filename = OC_Helper::tmpFileNoClean('.zip');
}else{
$filename = OC_Helper::tmpFile('.zip');
}
if ($zip->open($filename, ZIPARCHIVE::CREATE | ZIPARCHIVE::OVERWRITE)!==true) {
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exit("cannot open <$filename>\n");
}
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foreach($files as $file) {
$file=$dir.'/'.$file;
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if(OC_Filesystem::is_file($file)) {
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$tmpFile=OC_Filesystem::toTmpFile($file);
self::$tmpFiles[]=$tmpFile;
$zip->addFile($tmpFile, basename($file));
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}elseif(OC_Filesystem::is_dir($file)) {
self::zipAddDir($file, $zip);
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}
}
$zip->close();
set_time_limit($executionTime);
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}elseif(OC_Filesystem::is_dir($dir.'/'.$files)) {
self::validateZipDownload($dir, $files);
$executionTime = intval(ini_get('max_execution_time'));
set_time_limit(0);
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$zip = new ZipArchive();
if ($xsendfile) {
$filename = OC_Helper::tmpFileNoClean('.zip');
}else{
$filename = OC_Helper::tmpFile('.zip');
}
if ($zip->open($filename, ZIPARCHIVE::CREATE | ZIPARCHIVE::OVERWRITE)!==true) {
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exit("cannot open <$filename>\n");
}
$file=$dir.'/'.$files;
self::zipAddDir($file, $zip);
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$zip->close();
set_time_limit($executionTime);
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}else{
$zip=false;
$filename=$dir.'/'.$files;
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}
@ob_end_clean();
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if($zip or OC_Filesystem::is_readable($filename)) {
header('Content-Disposition: attachment; filename="'.basename($filename).'"');
header('Content-Transfer-Encoding: binary');
OC_Response::disableCaching();
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if($zip) {
ini_set('zlib.output_compression', 'off');
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header('Content-Type: application/zip');
header('Content-Length: ' . filesize($filename));
self::addSendfileHeader($filename);
}else{
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header('Content-Type: '.OC_Filesystem::getMimeType($filename));
$storage = OC_Filesystem::getStorage($filename);
if ($storage instanceof OC_Filestorage_Local) {
self::addSendfileHeader(OC_Filesystem::getLocalFile($filename));
}
}
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}elseif($zip or !OC_Filesystem::file_exists($filename)) {
header("HTTP/1.0 404 Not Found");
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$tmpl = new OC_Template( '', '404', 'guest' );
$tmpl->assign('file', $filename);
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$tmpl->printPage();
}else{
header("HTTP/1.0 403 Forbidden");
die('403 Forbidden');
}
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if($only_header) {
if(!$zip)
header("Content-Length: ".OC_Filesystem::filesize($filename));
return ;
}
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if($zip) {
$handle=fopen($filename, 'r');
if ($handle) {
$chunkSize = 8*1024;// 1 MB chunks
while (!feof($handle)) {
echo fread($handle, $chunkSize);
flush();
}
}
if (!$xsendfile) {
unlink($filename);
}
}else{
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OC_Filesystem::readfile($filename);
}
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foreach(self::$tmpFiles as $tmpFile) {
if(file_exists($tmpFile) and is_file($tmpFile)) {
unlink($tmpFile);
}
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}
}
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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: " . $filename);
}
}
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public static function zipAddDir($dir, $zip, $internalDir='') {
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$dirname=basename($dir);
$zip->addEmptyDir($internalDir.$dirname);
$internalDir.=$dirname.='/';
$files=OC_Files::getDirectoryContent($dir);
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foreach($files as $file) {
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$filename=$file['name'];
$file=$dir.'/'.$filename;
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if(OC_Filesystem::is_file($file)) {
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$tmpFile=OC_Filesystem::toTmpFile($file);
OC_Files::$tmpFiles[]=$tmpFile;
$zip->addFile($tmpFile, $internalDir.$filename);
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}elseif(OC_Filesystem::is_dir($file)) {
self::zipAddDir($file, $zip, $internalDir);
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}
}
}
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/**
* move a file or folder
*
* @param dir $sourceDir
* @param file $source
* @param dir $targetDir
* @param file $target
*/
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public static function move($sourceDir, $source, $targetDir, $target) {
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if(OC_User::isLoggedIn() && ($sourceDir != '' || $source != 'Shared')) {
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$targetFile=self::normalizePath($targetDir.'/'.$target);
$sourceFile=self::normalizePath($sourceDir.'/'.$source);
return OC_Filesystem::rename($sourceFile, $targetFile);
} else {
return false;
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}
}
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/**
* copy a file or folder
*
* @param dir $sourceDir
* @param file $source
* @param dir $targetDir
* @param file $target
*/
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public static function copy($sourceDir, $source, $targetDir, $target) {
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if(OC_User::isLoggedIn()) {
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$targetFile=$targetDir.'/'.$target;
$sourceFile=$sourceDir.'/'.$source;
return OC_Filesystem::copy($sourceFile, $targetFile);
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}
}
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/**
* create a new file or folder
*
* @param dir $dir
* @param file $name
* @param type $type
*/
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public static function newFile($dir, $name, $type) {
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if(OC_User::isLoggedIn()) {
$file=$dir.'/'.$name;
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if($type=='dir') {
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return OC_Filesystem::mkdir($file);
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}elseif($type=='file') {
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$fileHandle=OC_Filesystem::fopen($file, 'w');
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if($fileHandle) {
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fclose($fileHandle);
return true;
}else{
return false;
}
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}
}
}
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/**
* deletes a file or folder
*
* @param dir $dir
* @param file $name
*/
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public static function delete($dir, $file) {
if(OC_User::isLoggedIn() && ($dir!= '' || $file != 'Shared')) {
$file=$dir.'/'.$file;
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return OC_Filesystem::unlink($file);
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}
}
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/**
* 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, $files) {
if(!OC_Config::getValue('allowZipDownload', true)) {
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$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) {
$totalsize = 0;
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if(is_array($files)) {
foreach($files as $file) {
$totalsize += OC_Filesystem::filesize($dir.'/'.$file);
}
}else{
$totalsize += OC_Filesystem::filesize($dir.'/'.$files);
}
if($totalsize > $zipLimit) {
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$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);
$tmpl->printPage();
exit;
}
}
}
/**
* try to detect the mime type of a file
*
* @param string path
* @return string guessed mime type
*/
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static function getMimeType($path) {
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return OC_Filesystem::getMimeType($path);
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}
/**
* get a file tree
*
* @param string path
* @return array
*/
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static function getTree($path) {
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return OC_Filesystem::getTree($path);
}
/**
* pull a file from a remote server
* @param string source
* @param string token
* @param string dir
* @param string file
* @return string guessed mime type
*/
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static function pull($source, $token, $dir, $file) {
$tmpfile=tempnam(get_temp_dir(), 'remoteCloudFile');
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$fp=fopen($tmpfile, 'w+');
$url=$source.="/files/pull.php?token=$token";
$ch=curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_FILE, $fp);
curl_exec($ch);
fclose($fp);
$info=curl_getinfo($ch);
$httpCode=$info['http_code'];
curl_close($ch);
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if($httpCode==200 or $httpCode==0) {
OC_Filesystem::fromTmpFile($tmpfile, $dir.'/'.$file);
return true;
}else{
return false;
}
}
/**
* set the maximum upload size limit for apache hosts using .htaccess
* @param int size filesisze in bytes
* @return false on failure, size on success
*/
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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', $htaccess);
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return OC_Helper::computerFileSize($size);
} else { OC_Log::write('files', 'Can\'t write upload limit to '.OC::$SERVERROOT.'/.htaccess. Please check the file permissions', OC_Log::WARN); }
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return false;
}
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/**
* normalize a path, removing any double, add leading /, etc
* @param string $path
* @return string
*/
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static public function normalizePath($path) {
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$path='/'.$path;
$old='';
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while($old!=$path) {//replace any multiplicity of slashes with a single one
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$old=$path;
$path=str_replace('//', '/', $path);
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}
return $path;
}
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}
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function fileCmp($a, $b) {
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if($a['type']=='dir' and $b['type']!='dir') {
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return -1;
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}elseif($a['type']!='dir' and $b['type']=='dir') {
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return 1;
}else{
return strnatcasecmp($a['name'], $b['name']);
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}
}