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<?php
/*
* FCKeditor - The text editor for Internet - http://www.fckeditor.net
* Copyright (C) 2003-2009 Frederico Caldeira Knabben
*
* == BEGIN LICENSE ==
*
* Licensed under the terms of any of the following licenses at your
* choice:
*
* - GNU General Public License Version 2 or later (the "GPL")
* http://www.gnu.org/licenses/gpl.html
*
* - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
* http://www.gnu.org/licenses/lgpl.html
*
* - Mozilla Public License Version 1.1 or later (the "MPL")
* http://www.mozilla.org/MPL/MPL-1.1.html
*
* == END LICENSE ==
*
* Utility functions for the File Manager Connector for PHP.
*/
function RemoveFromStart( $sourceString, $charToRemove )
{
$sPattern = '|^' . $charToRemove . '+|' ;
return preg_replace( $sPattern, '', $sourceString ) ;
}
function RemoveFromEnd( $sourceString, $charToRemove )
{
$sPattern = '|' . $charToRemove . '+$|' ;
return preg_replace( $sPattern, '', $sourceString ) ;
}
function FindBadUtf8( $string )
{
$regex =
'([\x00-\x7F]'.
'|[\xC2-\xDF][\x80-\xBF]'.
'|\xE0[\xA0-\xBF][\x80-\xBF]'.
'|[\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}'.
'|\xED[\x80-\x9F][\x80-\xBF]'.
'|\xF0[\x90-\xBF][\x80-\xBF]{2}'.
'|[\xF1-\xF3][\x80-\xBF]{3}'.
'|\xF4[\x80-\x8F][\x80-\xBF]{2}'.
'|(.{1}))';
while (preg_match('/'.$regex.'/S', $string, $matches)) {
if ( isset($matches[2])) {
return true;
}
$string = substr($string, strlen($matches[0]));
}
return false;
}
function ConvertToXmlAttribute( $value )
{
if ( defined( 'PHP_OS' ) )
{
$os = PHP_OS ;
}
else
{
$os = php_uname() ;
}
if ( strtoupper( substr( $os, 0, 3 ) ) === 'WIN' || FindBadUtf8( $value ) )
{
return ( utf8_encode( htmlspecialchars( $value ) ) ) ;
}
else
{
return ( htmlspecialchars( $value ) ) ;
}
}
/**
* Check whether given extension is in html etensions list
*
* @param string $ext
* @param array $htmlExtensions
* @return boolean
*/
function IsHtmlExtension( $ext, $htmlExtensions )
{
if ( !$htmlExtensions || !is_array( $htmlExtensions ) )
{
return false ;
}
$lcaseHtmlExtensions = array() ;
foreach ( $htmlExtensions as $key => $val )
{
$lcaseHtmlExtensions[$key] = strtolower( $val ) ;
}
return in_array( $ext, $lcaseHtmlExtensions ) ;
}
/**
* Detect HTML in the first KB to prevent against potential security issue with
* IE/Safari/Opera file type auto detection bug.
* Returns true if file contain insecure HTML code at the beginning.
*
* @param string $filePath absolute path to file
* @return boolean
*/
function DetectHtml( $filePath )
{
$fp = @fopen( $filePath, 'rb' ) ;
//open_basedir restriction, see #1906
if ( $fp === false || !flock( $fp, LOCK_SH ) )
{
return -1 ;
}
$chunk = fread( $fp, 1024 ) ;
flock( $fp, LOCK_UN ) ;
fclose( $fp ) ;
$chunk = strtolower( $chunk ) ;
if (!$chunk)
{
return false ;
}
$chunk = trim( $chunk ) ;
if ( preg_match( "/<!DOCTYPE\W*X?HTML/sim", $chunk ) )
{
return true;
}
$tags = array( '<body', '<head', '<html', '<img', '<pre', '<script', '<table', '<title' ) ;
foreach( $tags as $tag )
{
if( false !== strpos( $chunk, $tag ) )
{
return true ;
}
}
//type = javascript
if ( preg_match( '!type\s*=\s*[\'"]?\s*(?:\w*/)?(?:ecma|java)!sim', $chunk ) )
{
return true ;
}
//href = javascript
//src = javascript
//data = javascript
if ( preg_match( '!(?:href|src|data)\s*=\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) )
{
return true ;
}
//url(javascript
if ( preg_match( '!url\s*\(\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) )
{
return true ;
}
return false ;
}
/**
* Check file content.
* Currently this function validates only image files.
* Returns false if file is invalid.
*
* @param string $filePath absolute path to file
* @param string $extension file extension
* @param integer $detectionLevel 0 = none, 1 = use getimagesize for images, 2 = use DetectHtml for images
* @return boolean
*/
function IsImageValid( $filePath, $extension )
{
if (!@is_readable($filePath)) {
return -1;
}
$imageCheckExtensions = array('gif', 'jpeg', 'jpg', 'png', 'swf', 'psd', 'bmp', 'iff');
// version_compare is available since PHP4 >= 4.0.7
if ( function_exists( 'version_compare' ) ) {
$sCurrentVersion = phpversion();
if ( version_compare( $sCurrentVersion, "4.2.0" ) >= 0 ) {
$imageCheckExtensions[] = "tiff";
$imageCheckExtensions[] = "tif";
}
if ( version_compare( $sCurrentVersion, "4.3.0" ) >= 0 ) {
$imageCheckExtensions[] = "swc";
}
if ( version_compare( $sCurrentVersion, "4.3.2" ) >= 0 ) {
$imageCheckExtensions[] = "jpc";
$imageCheckExtensions[] = "jp2";
$imageCheckExtensions[] = "jpx";
$imageCheckExtensions[] = "jb2";
$imageCheckExtensions[] = "xbm";
$imageCheckExtensions[] = "wbmp";
}
}
if ( !in_array( $extension, $imageCheckExtensions ) ) {
return true;
}
if ( @getimagesize( $filePath ) === false ) {
return false ;
}
return true;
}
?>
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