lib/htmlpurifier/HTMLPurifier/AttrDef/CSS/Background.php

   1 <?php
   2
   3 require_once 'HTMLPurifier/AttrDef.php';
   4 require_once 'HTMLPurifier/CSSDefinition.php';
   5
   6 /**
   7  * Validates shorthand CSS property background.
   8  * @warning Does not support url tokens that have internal spaces.
   9  */
  10 class HTMLPurifier_AttrDef_CSS_Background extends HTMLPurifier_AttrDef
  11 {
  12
  13     /**
  14      * Local copy of component validators.
  15      * @note See HTMLPurifier_AttrDef_Font::$info for a similar impl.
  16      */
  17     var $info;
  18
  19     function HTMLPurifier_AttrDef_CSS_Background($config) {
  20         $def = $config->getCSSDefinition();
  21         $this->info['background-color'] = $def->info['background-color'];
  22         $this->info['background-image'] = $def->info['background-image'];
  23         $this->info['background-repeat'] = $def->info['background-repeat'];
  24         $this->info['background-attachment'] = $def->info['background-attachment'];
  25         $this->info['background-position'] = $def->info['background-position'];
  26     }
  27
  28     function validate($string, $config, &$context) {
  29
  30         // regular pre-processing
  31         $string = $this->parseCDATA($string);
  32         if ($string === '') return false;
  33
  34         // munge rgb() decl if necessary
  35         $string = $this->mungeRgb($string);
  36
  37         // assumes URI doesn't have spaces in it
  38         $bits = explode(' ', strtolower($string)); // bits to process
  39
  40         $caught = array();
  41         $caught['color']    = false;
  42         $caught['image']    = false;
  43         $caught['repeat']   = false;
  44         $caught['attachment'] = false;
  45         $caught['position'] = false;
  46
  47         $i = 0; // number of catches
  48         $none = false;
  49
  50         foreach ($bits as $bit) {
  51             if ($bit === '') continue;
  52             foreach ($caught as $key => $status) {
  53                 if ($key != 'position') {
  54                     if ($status !== false) continue;
  55                     $r = $this->info['background-' . $key]->validate($bit, $config, $context);
  56                 } else {
  57                     $r = $bit;
  58                 }
  59                 if ($r === false) continue;
  60                 if ($key == 'position') {
  61                     if ($caught[$key] === false) $caught[$key] = '';
  62                     $caught[$key] .= $r . ' ';
  63                 } else {
  64                     $caught[$key] = $r;
  65                 }
  66                 $i++;
  67                 break;
  68             }
  69         }
  70
  71         if (!$i) return false;
  72         if ($caught['position'] !== false) {
  73             $caught['position'] = $this->info['background-position']->
  74                 validate($caught['position'], $config, $context);
  75         }
  76
  77         $ret = array();
  78         foreach ($caught as $value) {
  79             if ($value === false) continue;
  80             $ret[] = $value;
  81         }
  82
  83         if (empty($ret)) return false;
  84         return implode(' ', $ret);
  85
  86     }
  87
  88 }
  89