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<?php
/**
* @copyright Copyright (C) 2005 - 2014 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
defined('_JEXEC') or die;
/**
* @package Joomla.Administrator
* @subpackage com_media
*/
abstract class MediaHelper
{
/**
* Checks if the file is an image
* @param string The filename
* @return boolean
*/
public static function isImage($fileName)
{
static $imageTypes = 'xcf|odg|gif|jpg|png|bmp';
return preg_match("/\.(?:$imageTypes)$/i", $fileName);
}
/**
* Checks if the file is an image
* @param string The filename
* @return boolean
*/
public static function getTypeIcon($fileName)
{
// Get file extension
return strtolower(substr($fileName, strrpos($fileName, '.') + 1));
}
/**
* Checks if the file can be uploaded
*
* @param array File information
* @param string An error message to be returned
* @return boolean
*/
public static function canUpload($file, &$err)
{
$params = JComponentHelper::getParams('com_media');
if (empty($file['name']))
{
$err = 'COM_MEDIA_ERROR_UPLOAD_INPUT';
return false;
}
jimport('joomla.filesystem.file');
if ($file['name'] !== JFile::makesafe($file['name']))
{
$err = 'COM_MEDIA_ERROR_WARNFILENAME';
return false;
}
$format = strtolower(JFile::getExt($file['name']));
// Media file names should never have executable extensions buried in them.
$executable = array(
'php', 'js', 'exe', 'phtml', 'java', 'perl', 'py', 'asp','dll', 'go', 'ade', 'adp', 'bat', 'chm', 'cmd', 'com', 'cpl', 'hta', 'ins', 'isp',
'jse', 'lib', 'mde', 'msc', 'msp', 'mst', 'pif', 'scr', 'sct', 'shb', 'sys', 'vb', 'vbe', 'vbs', 'vxd', 'wsc', 'wsf', 'wsh'
);
$explodedFileName = explode('.', $file['name']);
if (count($explodedFileName > 2))
{
foreach ($executable as $extensionName)
{
if (in_array($extensionName, $explodedFileName))
{
$app->enqueueMessage(JText::_('JLIB_MEDIA_ERROR_WARNFILETYPE'), 'notice');
return false;
}
}
}
$allowable = explode(',', $params->get('upload_extensions'));
$ignored = explode(',', $params->get('ignore_extensions'));
if ($format == '' || $format == false || (!in_array($format, $allowable) && !in_array($format, $ignored)))
{
$err = 'COM_MEDIA_ERROR_WARNFILETYPE';
return false;
}
$maxSize = (int) ($params->get('upload_maxsize', 0) * 1024 * 1024);
if ($maxSize > 0 && (int) $file['size'] > $maxSize)
{
$err = 'COM_MEDIA_ERROR_WARNFILETOOLARGE';
return false;
}
$user = JFactory::getUser();
$imginfo = null;
if ($params->get('restrict_uploads', 1)) {
$images = explode(',', $params->get('image_extensions'));
if (in_array($format, $images)) { // if its an image run it through getimagesize
// if tmp_name is empty, then the file was bigger than the PHP limit
if (!empty($file['tmp_name'])) {
if (($imginfo = getimagesize($file['tmp_name'])) === FALSE) {
$err = 'COM_MEDIA_ERROR_WARNINVALID_IMG';
return false;
}
} else {
$err = 'COM_MEDIA_ERROR_WARNFILETOOLARGE';
return false;
}
} elseif (!in_array($format, $ignored)) {
// if its not an image...and we're not ignoring it
$allowed_mime = explode(',', $params->get('upload_mime'));
$illegal_mime = explode(',', $params->get('upload_mime_illegal'));
if (function_exists('finfo_open') && $params->get('check_mime', 1)) {
// We have fileinfo
$finfo = finfo_open(FILEINFO_MIME);
$type = finfo_file($finfo, $file['tmp_name']);
if (strlen($type) && !in_array($type, $allowed_mime) && in_array($type, $illegal_mime)) {
$err = 'COM_MEDIA_ERROR_WARNINVALID_MIME';
return false;
}
finfo_close($finfo);
} elseif (function_exists('mime_content_type') && $params->get('check_mime', 1)) {
// we have mime magic
$type = mime_content_type($file['tmp_name']);
if (strlen($type) && !in_array($type, $allowed_mime) && in_array($type, $illegal_mime)) {
$err = 'COM_MEDIA_ERROR_WARNINVALID_MIME';
return false;
}
} elseif (!$user->authorise('core.manage')) {
$err = 'COM_MEDIA_ERROR_WARNNOTADMIN';
return false;
}
}
}
$xss_check = JFile::read($file['tmp_name'], false, 256);
$html_tags = array('abbr', 'acronym', 'address', 'applet', 'area', 'audioscope', 'base', 'basefont', 'bdo', 'bgsound', 'big', 'blackface', 'blink', 'blockquote', 'body', 'bq', 'br', 'button', 'caption', 'center', 'cite', 'code', 'col', 'colgroup', 'comment', 'custom', 'dd', 'del', 'dfn', 'dir', 'div', 'dl', 'dt', 'em', 'embed', 'fieldset', 'fn', 'font', 'form', 'frame', 'frameset', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'head', 'hr', 'html', 'iframe', 'ilayer', 'img', 'input', 'ins', 'isindex', 'keygen', 'kbd', 'label', 'layer', 'legend', 'li', 'limittext', 'link', 'listing', 'map', 'marquee', 'menu', 'meta', 'multicol', 'nobr', 'noembed', 'noframes', 'noscript', 'nosmartquotes', 'object', 'ol', 'optgroup', 'option', 'param', 'plaintext', 'pre', 'rt', 'ruby', 's', 'samp', 'script', 'select', 'server', 'shadow', 'sidebar', 'small', 'spacer', 'span', 'strike', 'strong', 'style', 'sub', 'sup', 'table', 'tbody', 'td', 'textarea', 'tfoot', 'th', 'thead', 'title', 'tr', 'tt', 'ul', 'var', 'wbr', 'xml', 'xmp', '!DOCTYPE', '!--');
foreach($html_tags as $tag) {
// A tag is '<tagname ', so we need to add < and a space or '<tagname>'
if (stristr($xss_check, '<'.$tag.' ') || stristr($xss_check, '<'.$tag.'>')) {
$err = 'COM_MEDIA_ERROR_WARNIEXSS';
return false;
}
}
return true;
}
public static function parseSize($size)
{
if ($size < 1024) {
return JText::sprintf('COM_MEDIA_FILESIZE_BYTES', $size);
}
elseif ($size < 1024 * 1024) {
return JText::sprintf('COM_MEDIA_FILESIZE_KILOBYTES', sprintf('%01.2f', $size / 1024.0));
}
else {
return JText::sprintf('COM_MEDIA_FILESIZE_MEGABYTES', sprintf('%01.2f', $size / (1024.0 * 1024)));
}
}
public static function imageResize($width, $height, $target)
{
//takes the larger size of the width and height and applies the
//formula accordingly...this is so this script will work
//dynamically with any size image
if ($width > $height) {
$percentage = ($target / $width);
} else {
$percentage = ($target / $height);
}
//gets the new value and applies the percentage, then rounds the value
$width = round($width * $percentage);
$height = round($height * $percentage);
return array($width, $height);
}
public static function countFiles($dir)
{
$total_file = 0;
$total_dir = 0;
if (is_dir($dir)) {
$d = dir($dir);
while (false !== ($entry = $d->read())) {
if (substr($entry, 0, 1) != '.' && is_file($dir . DIRECTORY_SEPARATOR . $entry) && strpos($entry, '.html') === false && strpos($entry, '.php') === false) {
$total_file++;
}
if (substr($entry, 0, 1) != '.' && is_dir($dir . DIRECTORY_SEPARATOR . $entry)) {
$total_dir++;
}
}
$d->close();
}
return array ($total_file, $total_dir);
}
}