crm.fsf.org/20131203/files/sites/all/modules-new/civicrm/packages/IDS/vendors/htmlpurifier/HTMLPurifier/AttrDef/CSS/Filter.php

   1 <?php
   2
   3 /**
   4  * Microsoft's proprietary filter: CSS property
   5  * @note Currently supports the alpha filter. In the future, this will
   6  *       probably need an extensible framework
   7  */
   8 class HTMLPurifier_AttrDef_CSS_Filter extends HTMLPurifier_AttrDef
   9 {
  10
  11     protected $intValidator;
  12
  13     public function __construct() {
  14         $this->intValidator = new HTMLPurifier_AttrDef_Integer();
  15     }
  16
  17     public function validate($value, $config, $context) {
  18         $value = $this->parseCDATA($value);
  19         if ($value === 'none') return $value;
  20         // if we looped this we could support multiple filters
  21         $function_length = strcspn($value, '(');
  22         $function = trim(substr($value, 0, $function_length));
  23         if ($function !== 'alpha' &&
  24             $function !== 'Alpha' &&
  25             $function !== 'progid:DXImageTransform.Microsoft.Alpha'
  26             ) return false;
  27         $cursor = $function_length + 1;
  28         $parameters_length = strcspn($value, ')', $cursor);
  29         $parameters = substr($value, $cursor, $parameters_length);
  30         $params = explode(',', $parameters);
  31         $ret_params = array();
  32         $lookup = array();
  33         foreach ($params as $param) {
  34             list($key, $value) = explode('=', $param);
  35             $key   = trim($key);
  36             $value = trim($value);
  37             if (isset($lookup[$key])) continue;
  38             if ($key !== 'opacity') continue;
  39             $value = $this->intValidator->validate($value, $config, $context);
  40             if ($value === false) continue;
  41             $int = (int) $value;
  42             if ($int > 100) $value = '100';
  43             if ($int < 0) $value = '0';
  44             $ret_params[] = "$key=$value";
  45             $lookup[$key] = true;
  46         }
  47         $ret_parameters = implode(',', $ret_params);
  48         $ret_function = "$function($ret_parameters)";
  49         return $ret_function;
  50     }
  51
  52 }
  53
  54 // vim: et sw=4 sts=4