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<?php
/*
* check file extension of upload file
* required finfo_open extension for php
*
* See more at:
* http://hungred.com/useful-information/secure-file-upload-check-list-php/#sthash.drlxs1Cd.dpuf
* http://hackers2devnull.blogspot.hk/2013/05/how-to-shell-server-via-image-upload.html
*
*/
class Uploader {
/*
* filename
* The filename of the uploaded file.
* destination
* The destination of the moved file.
*/
var $uploadFile;
var $destination;
var $filename;
var $fullpath;
var $checked = false;
//var $isImage = true;
var $success = false;
var $AllowedContentType;
var $AllowedExtension;
/*predefined sets*/
//CONTENT TYPE
static $MIME_XXX = array('application/octet-stream'); //unknown type
static $MIME_IMG = array('image/x-bmp', 'image/gif', 'image/jpeg',
'image/pjeg', 'image/png', 'image/x-png');
static $MIME_TXT = array('text/plain', 'text/xml', 'text/html');
static $MIME_DOC = array('application/pdf','application/postscript', 'application/rtf', 'application/vnd.ms-office',
'application/msword', 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
'application/vnd.ms-excel', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
'application/vnd.ms-powerpoint', 'application/vnd.openxmlformats-officedocument.presentationml.presentation',);
static $MIME_ZIP = array('application/gzip', 'application/x-gzip', 'application/zip', 'application/x-zip-compressed',
'application/x-7z-compressed', 'application/x-rar-compressed');
//EXTENSION
static $EXT_IMG = array('bmp', 'gif', 'jpeg', 'png');
static $EXT_TXT = array('txt', 'xml', 'html', 'htm');
static $EXT_DOC = array('pdf', 'ps', 'rtf', 'doc', 'docx', 'xls', 'xlsx', 'ppt', 'pptx');
static $EXT_ZIP = array('gz', 'zip', '7z', 'rar');
static $INVALID_FILENAME_REGEX = '/(php|htaccess|htpasswd)/i';
static $VALID_CHARS_REGEX = '.A-Za-z0-9_-\s ';// Characters allowed in the file name (in a Regular Expression format)
//const IMG = 'IMG';
//do something like $u = new Uploader($_FILES["pimgfile"]);
public function Uploader($uploadFile, $setting=null){
if(empty($setting)){ //allow image
$this->AllowedContentType = self::$MIME_IMG;
$this->AllowedExtension = self::$EXT_IMG;
}else{ //setup whitelist
$this->AllowedContentType = $setting['MIME'];
$this->AllowedExtension = $setting['EXT'];
}
//vdump($this->AllowedContentType, $this->AllowedExtension);
//$uploadFile['name'], $uploadFile['tmp_name'], $uploadFile['size'], $uploadFile['type'],
$this->uploadFile = $uploadFile;
//vdump($this->uploadFile);
if (isset($this->uploadFile['error']) && $this->uploadFile['error'] != 0) {
echo $this->uploadFile['error'];
exit(0);
} else if (!isset($this->uploadFile['tmp_name']) || !@is_uploaded_file($this->uploadFile['tmp_name'])) {
echo 'Upload failed is_uploaded_file test.';
exit(0);
} else if (!isset($this->uploadFile['name'])) {
echo 'File has no name.';
exit(0);
}
$this->filename = preg_replace('/[^'.self::$VALID_CHARS_REGEX.']|\.+$/i', '', strtolower(basename($this->uploadFile['name'])));
}
public function check(){
$this->checked = false;
$t0 = self::check_filename($this->uploadFile['name']);
$t1 = $this->_check_contentType();
$t2 = $this->_check_imageMIME();
$t3 = $this->_check_extension();
$this->checked = ($t0 && $t1 && $t2 && $t3);
//vdump($t1, $t2, $t3, $this->checked);
return $this->checked;
}
protected function _check_contentType(){
$ct = finfo_file(finfo_open(FILEINFO_MIME_TYPE), $this->uploadFile['tmp_name']);
//vdump('CT check', $ct, $this->AllowedContentType);
//if finfo_file is not working
//use param: $setting['MIME'] = array_merge(Uploader::$MIME_DOC, Uploader::$MIME_XXX);
//if( in_array(strtolower($this->uploadFile['type']), $this->AllowedContentType) ){
if( in_array(strtolower($ct), $this->AllowedContentType) ){
return true;
}else{
print "Invalid Content Type $ct <br/>";
return false;
}
}
protected function _check_imageMIME(){
if(in_array(strtolower($this->uploadFile['type']), self::$MIME_IMG)){
$imageinfo = getimagesize( $this->uploadFile['tmp_name']);
//vdump('image MIME check', $imageinfo);
if( in_array(strtolower($imageinfo['mime']), $this->AllowedContentType) ){
return true;
}else{
print "Invalid Image Content Type : ".$imageinfo['mime']."<br/>";
return false;
}
}
return true;
}
protected function _check_extension(){
// $extension = end(explode('.', $this->uploadFile['name']));
$extension = pathinfo($this->uploadFile['name'], PATHINFO_EXTENSION);
//$extension = $file_parts['extension'];
//vdump('EXT check', $extension, $this->AllowedExtension);
if(!in_array(strtolower($extension), $this->AllowedExtension)){
print "Invalid Extension: $extension <br/>";
return false;
}
return true;
}
public function save($destination, $chmod=null){
if(self::check_filename($this->filename)==false){
return false;
}
$this->destination = $destination;
$this->fullpath = $this->destination . $this->filename;
//vdump("Saving", $this->filename, $this->fullpath);
$this->success = move_uploaded_file($this->uploadFile['tmp_name'], $this->fullpath);
if($chmod){ //some permission like "0644"
@chmod($this->fullpath, $chmod);
}
return $this->success;
}
/*
* simple static method to upload at once
* always rename the upload file to prevent overwrite system file: .htaccess etc.
*/
public static function quick_save($uploadFile, $destination, $filename=null, $setting=null){
$f = new Uploader($uploadFile, $setting);
$f->filename = $filename;
//$f->destination = $destination;
if( $f->check() && $f->save($destination) ){
return $f;
}else{
return false;
}
}
public static function check_filename($filename, $filter_regex=null){
if(empty($filter_regex)){
$filter_regex = self::$INVALID_FILENAME_REGEX;
}
$error = preg_match($filter_regex, $filename, $matched);
if($error){
print "Invalid Filename <br/>";
}
//vdump($filter_regex, $matched);
return !$error;
}
}
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