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   1  <?php
   2  /**
   3   * @version        $Id: media.php 14401 2010-01-26 14:10:00Z louis $
   4   * @package        Joomla
   5   * @subpackage    Media
   6   * @copyright    Copyright (C) 2005 - 2010 Open Source Matters. All rights reserved.
   7   * @license        GNU/GPL, see LICENSE.php
   8   * Joomla! is free software. This version may have been modified pursuant to the
   9   * GNU General Public License, and as distributed it includes or is derivative
  10   * of works licensed under the GNU General Public License or other free or open
  11   * source software licenses. See COPYRIGHT.php for copyright notices and
  12   * details.
  13   */
  14  
  15  /**
  16   * @package        Joomla
  17   * @subpackage    Media
  18   */
  19  class MediaHelper
  20  {
  21      /**
  22       * Checks if the file is an image
  23       * @param string The filename
  24       * @return boolean
  25       */
  26  	function isImage( $fileName )
  27      {
  28          static $imageTypes = 'xcf|odg|gif|jpg|png|bmp';
  29          return preg_match("/$imageTypes/i",$fileName);
  30      }
  31  
  32      /**
  33       * Checks if the file is an image
  34       * @param string The filename
  35       * @return boolean
  36       */
  37  	function getTypeIcon( $fileName )
  38      {
  39          // Get file extension
  40          return strtolower(substr($fileName, strrpos($fileName, '.') + 1));
  41      }
  42  
  43      /**
  44       * Checks if the file can be uploaded
  45       *
  46       * @param array File information
  47       * @param string An error message to be returned
  48       * @return boolean
  49       */
  50  	function canUpload( $file, &$err )
  51      {
  52          $params = &JComponentHelper::getParams( 'com_media' );
  53  
  54          if(empty($file['name'])) {
  55              $err = 'Please input a file for upload';
  56              return false;
  57          }
  58  
  59          jimport('joomla.filesystem.file');
  60          if ($file['name'] !== JFile::makesafe($file['name'])) {
  61              $err = 'WARNFILENAME';
  62              return false;
  63          }
  64  
  65          $format = strtolower(JFile::getExt($file['name']));
  66  
  67          $allowable = explode( ',', $params->get( 'upload_extensions' ));
  68          $ignored = explode(',', $params->get( 'ignore_extensions' ));
  69          if (!in_array($format, $allowable) && !in_array($format,$ignored))
  70          {
  71              $err = 'WARNFILETYPE';
  72              return false;
  73          }
  74  
  75          $maxSize = (int) $params->get( 'upload_maxsize', 0 );
  76          if ($maxSize > 0 && (int) $file['size'] > $maxSize)
  77          {
  78              $err = 'WARNFILETOOLARGE';
  79              return false;
  80          }
  81  
  82          $user = JFactory::getUser();
  83          $imginfo = null;
  84          if($params->get('restrict_uploads',1) ) {
  85              $images = explode( ',', $params->get( 'image_extensions' ));
  86              if(in_array($format, $images)) { // if its an image run it through getimagesize
  87                  if(($imginfo = getimagesize($file['tmp_name'])) === FALSE) {
  88                      $err = 'WARNINVALIDIMG';
  89                      return false;
  90                  }
  91              } else if(!in_array($format, $ignored)) {
  92                  // if its not an image...and we're not ignoring it
  93                  $allowed_mime = explode(',', $params->get('upload_mime'));
  94                  $illegal_mime = explode(',', $params->get('upload_mime_illegal'));
  95                  if(function_exists('finfo_open') && $params->get('check_mime',1)) {
  96                      // We have fileinfo
  97                      $finfo = finfo_open(FILEINFO_MIME);
  98                      $type = finfo_file($finfo, $file['tmp_name']);
  99                      if(strlen($type) && !in_array($type, $allowed_mime) && in_array($type, $illegal_mime)) {
 100                          $err = 'WARNINVALIDMIME';
 101                          return false;
 102                      }
 103                      finfo_close($finfo);
 104                  } else if(function_exists('mime_content_type') && $params->get('check_mime',1)) {
 105                      // we have mime magic
 106                      $type = mime_content_type($file['tmp_name']);
 107                      if(strlen($type) && !in_array($type, $allowed_mime) && in_array($type, $illegal_mime)) {
 108                          $err = 'WARNINVALIDMIME';
 109                          return false;
 110                      }
 111                  } else if(!$user->authorize( 'login', 'administrator' )) {
 112                      $err = 'WARNNOTADMIN';
 113                      return false;
 114                  }
 115              }
 116          }
 117  
 118          $xss_check =  JFile::read($file['tmp_name'],false,256);
 119          $html_tags = array('abbr','acronym','address','applet','area','audioscope','base','basefont','bdo','bgsound','big','blackface','blink','blockquote','body','bq','br','button','caption','center','cite','code','col','colgroup','comment','custom','dd','del','dfn','dir','div','dl','dt','em','embed','fieldset','fn','font','form','frame','frameset','h1','h2','h3','h4','h5','h6','head','hr','html','iframe','ilayer','img','input','ins','isindex','keygen','kbd','label','layer','legend','li','limittext','link','listing','map','marquee','menu','meta','multicol','nobr','noembed','noframes','noscript','nosmartquotes','object','ol','optgroup','option','param','plaintext','pre','rt','ruby','s','samp','script','select','server','shadow','sidebar','small','spacer','span','strike','strong','style','sub','sup','table','tbody','td','textarea','tfoot','th','thead','title','tr','tt','ul','var','wbr','xml','xmp','!DOCTYPE', '!--');
 120          foreach($html_tags as $tag) {
 121              // A tag is '<tagname ', so we need to add < and a space or '<tagname>'
 122              if(stristr($xss_check, '<'.$tag.' ') || stristr($xss_check, '<'.$tag.'>')) {
 123                  $err = 'WARNIEXSS';
 124                  return false;
 125              }
 126          }
 127          return true;
 128      }
 129  
 130  	function parseSize($size)
 131      {
 132          if ($size < 1024) {
 133              return $size . ' bytes';
 134          }
 135          else
 136          {
 137              if ($size >= 1024 && $size < 1024 * 1024) {
 138                  return sprintf('%01.2f', $size / 1024.0) . ' Kb';
 139              } else {
 140                  return sprintf('%01.2f', $size / (1024.0 * 1024)) . ' Mb';
 141              }
 142          }
 143      }
 144  
 145  	function imageResize($width, $height, $target)
 146      {
 147          //takes the larger size of the width and height and applies the
 148          //formula accordingly...this is so this script will work
 149          //dynamically with any size image
 150          if ($width > $height) {
 151              $percentage = ($target / $width);
 152          } else {
 153              $percentage = ($target / $height);
 154          }
 155  
 156          //gets the new value and applies the percentage, then rounds the value
 157          $width = round($width * $percentage);
 158          $height = round($height * $percentage);
 159  
 160          return array($width, $height);
 161      }
 162  
 163  	function countFiles( $dir )
 164      {
 165          $total_file = 0;
 166          $total_dir = 0;
 167  
 168          if (is_dir($dir)) {
 169              $d = dir($dir);
 170  
 171              while (false !== ($entry = $d->read())) {
 172                  if (substr($entry, 0, 1) != '.' && is_file($dir . DIRECTORY_SEPARATOR . $entry) && strpos($entry, '.html') === false && strpos($entry, '.php') === false) {
 173                      $total_file++;
 174                  }
 175                  if (substr($entry, 0, 1) != '.' && is_dir($dir . DIRECTORY_SEPARATOR . $entry)) {
 176                      $total_dir++;
 177                  }
 178              }
 179  
 180              $d->close();
 181          }
 182  
 183          return array ( $total_file, $total_dir );
 184      }
 185  
 186  }