nextcloud/lib/helper.php

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<?php
/**
* ownCloud
*
* @author Frank Karlitschek
* @author Jakob Sack
* @copyright 2010 Frank Karlitschek karlitschek@kde.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/>.
*
*/
/**
* Collection of useful functions
*/
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class OC_Helper {
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private static $mimetypes=array();
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private static $tmpFiles=array();
/**
* @brief Creates an url
* @param $app app
* @param $file file
* @returns the url
*
* Returns a url to the given app and file.
*/
public static function linkTo( $app, $file ){
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if( $app != '' ){
$app .= '/';
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// Check if the app is in the app folder
if( file_exists( OC::$APPSROOT . '/apps/'. $app.$file )){
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if(substr($file, -3) == 'php' || substr($file, -3) == 'css'){
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if(substr($app, -1, 1) == '/'){
$app = substr($app, 0, strlen($app) - 1);
}
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$urlLinkTo = OC::$WEBROOT . '/?app=' . $app;
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$urlLinkTo .= ($file!='index.php')?'&getfile=' . urlencode($file):'';
}else{
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$urlLinkTo = OC::$APPSWEBROOT . '/apps/' . $app . $file;
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}
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}
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else{
$urlLinkTo = OC::$WEBROOT . '/' . $app . $file;
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}
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}
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else{
if( file_exists( OC::$SERVERROOT . '/core/'. $file )){
$urlLinkTo = OC::$WEBROOT . '/core/'.$file;
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}
else{
$urlLinkTo = OC::$WEBROOT . '/'.$file;
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}
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}
return $urlLinkTo;
}
/**
* @brief Returns the server host
* @returns the server host
*
* Returns the server host, even if the website uses one or more
* reverse proxies
*/
public static function serverHost() {
if (isset($_SERVER['HTTP_X_FORWARDED_HOST'])) {
if (strpos($_SERVER['HTTP_X_FORWARDED_HOST'], ",") !== false) {
$host = trim(array_pop(explode(",", $_SERVER['HTTP_X_FORWARDED_HOST'])));
}
else{
$host=$_SERVER['HTTP_X_FORWARDED_HOST'];
}
}
else{
$host = $_SERVER['HTTP_HOST'];
}
return $host;
}
/**
* @brief Creates an absolute url
* @param $app app
* @param $file file
* @returns the url
*
* Returns a absolute url to the given app and file.
*/
public static function linkToAbsolute( $app, $file ) {
$urlLinkTo = self::linkTo( $app, $file );
// Checking if the request was made through HTTPS. The last in line is for IIS
$protocol = isset($_SERVER['HTTPS']) && !empty($_SERVER['HTTPS']) && ($_SERVER['HTTPS']!='off');
$urlLinkTo = ($protocol?'https':'http') . '://' . self::serverHost() . $urlLinkTo;
return $urlLinkTo;
}
/**
* @brief Creates path to an image
* @param $app app
* @param $image image name
* @returns the url
*
* Returns the path to the image.
*/
public static function imagePath( $app, $image ){
// Read the selected theme from the config file
$theme=OC_Config::getValue( "theme" );
// Check if the app is in the app folder
if( file_exists( OC::$SERVERROOT."/themes/$theme/apps/$app/img/$image" )){
return OC::$WEBROOT."/themes/$theme/apps/$app/img/$image";
}elseif( file_exists( OC::$APPSROOT."/apps/$app/img/$image" )){
return OC::$APPSWEBROOT."/apps/$app/img/$image";
}elseif( !empty( $app ) and file_exists( OC::$SERVERROOT."/themes/$theme/$app/img/$image" )){
return OC::$WEBROOT."/themes/$theme/$app/img/$image";
}elseif( !empty( $app ) and file_exists( OC::$SERVERROOT."/$app/img/$image" )){
return OC::$WEBROOT."/$app/img/$image";
}elseif( file_exists( OC::$SERVERROOT."/themes/$theme/core/img/$image" )){
return OC::$WEBROOT."/themes/$theme/core/img/$image";
}elseif( file_exists( OC::$SERVERROOT."/core/img/$image" )){
return OC::$WEBROOT."/core/img/$image";
}else{
echo('image not found: image:'.$image.' webroot:'.OC::$WEBROOT.' serverroot:'.OC::$SERVERROOT);
die();
}
}
/**
* @brief get path to icon of file type
* @param $mimetype mimetype
* @returns the url
*
* Returns the path to the image of this file type.
*/
public static function mimetypeIcon( $mimetype ){
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$alias=array('application/xml'=>'code/xml');
// echo $mimetype;
if(isset($alias[$mimetype])){
$mimetype=$alias[$mimetype];
// echo $mimetype;
}
// Replace slash with a minus
$mimetype = str_replace( "/", "-", $mimetype );
// Is it a dir?
if( $mimetype == "dir" ){
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return OC::$WEBROOT."/core/img/filetypes/folder.png";
}
// Icon exists?
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if( file_exists( OC::$SERVERROOT."/core/img/filetypes/$mimetype.png" )){
return OC::$WEBROOT."/core/img/filetypes/$mimetype.png";
}
//try only the first part of the filetype
$mimetype=substr($mimetype,0,strpos($mimetype,'-'));
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if( file_exists( OC::$SERVERROOT."/core/img/filetypes/$mimetype.png" )){
return OC::$WEBROOT."/core/img/filetypes/$mimetype.png";
}
else{
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return OC::$WEBROOT."/core/img/filetypes/file.png";
}
}
/**
* @brief Make a human file size
* @param $bytes file size in bytes
* @returns a human readable file size
*
* Makes 2048 to 2 kB.
*/
public static function humanFileSize( $bytes ){
if( $bytes < 1024 ){
return "$bytes B";
}
$bytes = round( $bytes / 1024, 1 );
if( $bytes < 1024 ){
return "$bytes kB";
}
$bytes = round( $bytes / 1024, 1 );
if( $bytes < 1024 ){
return "$bytes MB";
}
// Wow, heavy duty for owncloud
$bytes = round( $bytes / 1024, 1 );
return "$bytes GB";
}
/**
* @brief Make a computer file size
* @param $str file size in a fancy format
* @returns a file size in bytes
*
* Makes 2kB to 2048.
*
* Inspired by: http://www.php.net/manual/en/function.filesize.php#92418
*/
public static function computerFileSize( $str ){
$bytes = 0;
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$str=strtolower($str);
$bytes_array = array(
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'b' => 1,
'k' => 1024,
'kb' => 1024,
'mb' => 1024 * 1024,
'm' => 1024 * 1024,
'gb' => 1024 * 1024 * 1024,
'g' => 1024 * 1024 * 1024,
'tb' => 1024 * 1024 * 1024 * 1024,
't' => 1024 * 1024 * 1024 * 1024,
'pb' => 1024 * 1024 * 1024 * 1024 * 1024,
'p' => 1024 * 1024 * 1024 * 1024 * 1024,
);
$bytes = floatval($str);
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if (preg_match('#([kmgtp]?b?)$#si', $str, $matches) && !empty($bytes_array[$matches[1]])) {
$bytes *= $bytes_array[$matches[1]];
}
$bytes = round($bytes, 2);
return $bytes;
}
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/**
* @brief Recusive editing of file permissions
* @param $path path to file or folder
* @param $filemode unix style file permissions as integer
*
*/
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static function chmodr($path, $filemode) {
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if (!is_dir($path))
return chmod($path, $filemode);
$dh = opendir($path);
while (($file = readdir($dh)) !== false) {
if($file != '.' && $file != '..') {
$fullpath = $path.'/'.$file;
if(is_link($fullpath))
return FALSE;
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elseif(!is_dir($fullpath) && !@chmod($fullpath, $filemode))
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return FALSE;
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elseif(!self::chmodr($fullpath, $filemode))
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return FALSE;
}
}
closedir($dh);
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if(@chmod($path, $filemode))
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return TRUE;
else
return FALSE;
}
/**
* @brief Recusive copying of folders
* @param string $src source folder
* @param string $dest target folder
*
*/
static function copyr($src, $dest) {
if(is_dir($src)){
if(!is_dir($dest)){
mkdir($dest);
}
$files = scandir($src);
foreach ($files as $file){
if ($file != "." && $file != ".."){
self::copyr("$src/$file", "$dest/$file");
}
}
}elseif(file_exists($src)){
copy($src, $dest);
}
}
/**
* @brief Recusive deletion of folders
* @param string $dir path to the folder
*
*/
static function rmdirr($dir) {
if(is_dir($dir)) {
$files=scandir($dir);
foreach($files as $file){
if ($file != "." && $file != ".."){
self::rmdirr("$dir/$file");
}
}
rmdir($dir);
}elseif(file_exists($dir)){
unlink($dir);
}
if(file_exists($dir)) {
return false;
}
}
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/**
* get the mimetype form a local file
* @param string path
* @return string
* does NOT work for ownClouds filesystem, use OC_FileSystem::getMimeType instead
*/
static function getMimeType($path){
$isWrapped=(strpos($path,'://')!==false) and (substr($path,0,7)=='file://');
$mimeType='application/octet-stream';
if ($mimeType=='application/octet-stream') {
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self::$mimetypes = include('mimetypes.fixlist.php');
$extension=strtolower(strrchr(basename($path), "."));
$extension=substr($extension,1);//remove leading .
$mimeType=(isset(self::$mimetypes[$extension]))?self::$mimetypes[$extension]:'application/octet-stream';
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}
if (@is_dir($path)) {
// directories are easy
return "httpd/unix-directory";
}
if($mimeType=='application/octet-stream' and function_exists('finfo_open') and function_exists('finfo_file') and $finfo=finfo_open(FILEINFO_MIME)){
$info = @strtolower(finfo_file($finfo,$path));
if($info){
$mimeType=substr($info,0,strpos($info,';'));
}
finfo_close($finfo);
}
if (!$isWrapped and $mimeType=='application/octet-stream' && function_exists("mime_content_type")) {
// use mime magic extension if available
$mimeType = mime_content_type($path);
}
if (!$isWrapped and $mimeType=='application/octet-stream' && OC_Helper::canExecute("file")) {
// it looks like we have a 'file' command,
// lets see it it does have mime support
$path=escapeshellarg($path);
$fp = popen("file -i -b $path 2>/dev/null", "r");
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$reply = fgets($fp);
pclose($fp);
//trim the character set from the end of the response
$mimeType=substr($reply,0,strrpos($reply,' '));
}
if ($mimeType=='application/octet-stream') {
// Fallback solution: (try to guess the type by the file extension
if(!self::$mimetypes || self::$mimetypes != include('mimetypes.list.php')){
self::$mimetypes=include('mimetypes.list.php');
}
$extension=strtolower(strrchr(basename($path), "."));
$extension=substr($extension,1);//remove leading .
$mimeType=(isset(self::$mimetypes[$extension]))?self::$mimetypes[$extension]:'application/octet-stream';
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}
return $mimeType;
}
/**
* get the mimetype form a data string
* @param string data
* @return string
*/
static function getStringMimeType($data){
if(function_exists('finfo_open') and function_exists('finfo_file')){
$finfo=finfo_open(FILEINFO_MIME);
return finfo_buffer($finfo, $data);
}else{
$tmpFile=OC_Helper::tmpFile();
$fh=fopen($tmpFile,'wb');
fwrite($fh,$data,8024);
fclose($fh);
$mime=self::getMimeType($tmpFile);
unset($tmpFile);
return $mime;
}
}
/**
* @brief Checks $_REQUEST contains a var for the $s key. If so, returns the html-escaped value of this var; otherwise returns the default value provided by $d.
* @param $s name of the var to escape, if set.
* @param $d default value.
* @returns the print-safe value.
*
*/
//FIXME: should also check for value validation (i.e. the email is an email).
public static function init_var($s, $d="") {
$r = $d;
if(isset($_REQUEST[$s]) && !empty($_REQUEST[$s]))
$r = stripslashes(htmlspecialchars($_REQUEST[$s]));
return $r;
}
/**
* returns "checked"-attribut if request contains selected radio element OR if radio element is the default one -- maybe?
* @param string $s Name of radio-button element name
* @param string $v Value of current radio-button element
* @param string $d Value of default radio-button element
*/
public static function init_radio($s, $v, $d) {
if((isset($_REQUEST[$s]) && $_REQUEST[$s]==$v) || (!isset($_REQUEST[$s]) && $v == $d))
print "checked=\"checked\" ";
}
/**
* detect if a given program is found in the search PATH
*
* @param string program name
* @param string optional search path, defaults to $PATH
* @return bool true if executable program found in path
*/
public static function canExecute($name, $path = false){
// path defaults to PATH from environment if not set
if ($path === false) {
$path = getenv("PATH");
}
// check method depends on operating system
if (!strncmp(PHP_OS, "WIN", 3)) {
// on Windows an appropriate COM or EXE file needs to exist
$exts = array(".exe", ".com");
$check_fn = "file_exists";
} else {
// anywhere else we look for an executable file of that name
$exts = array("");
$check_fn = "is_executable";
}
// Default check will be done with $path directories :
$dirs = explode(PATH_SEPARATOR, $path);
// WARNING : We have to check if open_basedir is enabled :
$obd = ini_get('open_basedir');
if($obd != "none")
$obd_values = explode(PATH_SEPARATOR, $obd);
if(count($obd_values) > 0 and $obd_values[0])
{
// open_basedir is in effect !
// We need to check if the program is in one of these dirs :
$dirs = $obd_values;
}
foreach($dirs as $dir)
{
foreach($exts as $ext)
{
if($check_fn("$dir/$name".$ext))
return true;
}
}
return false;
}
/**
* copy the contents of one stream to another
* @param resource source
* @param resource target
* @return int the number of bytes copied
*/
public static function streamCopy($source,$target){
if(!$source or !$target){
return false;
}
$count=0;
while(!feof($source)){
$count+=fwrite($target,fread($source,8192));
}
return $count;
}
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/**
* create a temporary file with an unique filename
* @param string postfix
* @return string
*
* temporary files are automatically cleaned up after the script is finished
*/
public static function tmpFile($postfix=''){
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$file=get_temp_dir().'/'.md5(time().rand()).$postfix;
$fh=fopen($file,'w');
fclose($fh);
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self::$tmpFiles[]=$file;
return $file;
}
/**
* create a temporary folder with an unique filename
* @return string
*
* temporary files are automatically cleaned up after the script is finished
*/
public static function tmpFolder(){
$path=get_temp_dir().'/'.md5(time().rand());
mkdir($path);
self::$tmpFiles[]=$path;
return $path.'/';
}
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/**
* remove all files created by self::tmpFile
*/
public static function cleanTmp(){
$leftoversFile='/tmp/oc-not-deleted';
if(file_exists($leftoversFile)){
$leftovers=file($leftoversFile);
foreach($leftovers as $file) {
self::rmdirr($file);
}
unlink($leftoversFile);
}
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foreach(self::$tmpFiles as $file){
if(file_exists($file)){
if(!self::rmdirr($file)) {
file_put_contents($leftoversFile, $file."\n", FILE_APPEND);
}
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}
}
}
/**
* Adds a suffix to the name in case the file exists
*
* @param $path
* @param $filename
* @return string
*/
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public static function buildNotExistingFileName($path, $filename){
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if($path==='/'){
$path='';
}
if ($pos = strrpos($filename, '.')) {
$name = substr($filename, 0, $pos);
$ext = substr($filename, $pos);
} else {
$name = $filename;
}
$newpath = $path . '/' . $filename;
$newname = $filename;
$counter = 2;
while (OC_Filesystem::file_exists($newpath)) {
$newname = $name . ' (' . $counter . ')' . $ext;
$newpath = $path . '/' . $newname;
$counter++;
}
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return $newpath;
}
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/*
* checks if $sub is a subdirectory of $parent
*
* @param $sub
* @param $parent
* @return bool
*/
public static function issubdirectory($sub, $parent){
if($sub == null || $sub == '' || $parent == null || $parent == ''){
return false;
}
$realpath_sub = realpath($sub);
$realpath_parent = realpath($parent);
if(($realpath_sub == false && substr_count($realpath_sub, './') != 0) || ($realpath_parent == false && substr_count($realpath_parent, './') != 0)){ //it checks for both ./ and ../
return false;
}
if($realpath_sub && $realpath_sub != '' && $realpath_parent && $realpath_parent != ''){
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if(substr($realpath_sub, 0, strlen($realpath_parent)) == $realpath_parent){
return true;
}
}else{
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if(substr($sub, 0, strlen($parent)) == $parent){
return true;
}
}
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/*
echo 'SUB: ' . $sub . "\n";
echo 'PAR: ' . $parent . "\n";
echo 'REALSUB: ' . $realpath_sub . "\n";
echo 'REALPAR: ' . $realpath_parent . "\n";
echo substr($realpath_sub, 0, strlen($realpath_parent));
exit;
*/
return false;
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}
}