lib/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/Color.php

   1 <?php
   2
   3 /**
   4  * Validates Color as defined by CSS.
   5  */
   6 class HTMLPurifier_AttrDef_CSS_Color extends HTMLPurifier_AttrDef
   7 {
   8
   9     public function validate($color, $config, $context) {
  10
  11         static $colors = null;
  12         if ($colors === null) $colors = $config->get('Core.ColorKeywords');
  13
  14         $color = trim($color);
  15         if ($color === '') return false;
  16
  17         $lower = strtolower($color);
  18         if (isset($colors[$lower])) return $colors[$lower];
  19
  20         if (strpos($color, 'rgb(') !== false) {
  21             // rgb literal handling
  22             $length = strlen($color);
  23             if (strpos($color, ')') !== $length - 1) return false;
  24             $triad = substr($color, 4, $length - 4 - 1);
  25             $parts = explode(',', $triad);
  26             if (count($parts) !== 3) return false;
  27             $type = false; // to ensure that they're all the same type
  28             $new_parts = array();
  29             foreach ($parts as $part) {
  30                 $part = trim($part);
  31                 if ($part === '') return false;
  32                 $length = strlen($part);
  33                 if ($part[$length - 1] === '%') {
  34                     // handle percents
  35                     if (!$type) {
  36                         $type = 'percentage';
  37                     } elseif ($type !== 'percentage') {
  38                         return false;
  39                     }
  40                     $num = (float) substr($part, 0, $length - 1);
  41                     if ($num < 0) $num = 0;
  42                     if ($num > 100) $num = 100;
  43                     $new_parts[] = "$num%";
  44                 } else {
  45                     // handle integers
  46                     if (!$type) {
  47                         $type = 'integer';
  48                     } elseif ($type !== 'integer') {
  49                         return false;
  50                     }
  51                     $num = (int) $part;
  52                     if ($num < 0) $num = 0;
  53                     if ($num > 255) $num = 255;
  54                     $new_parts[] = (string) $num;
  55                 }
  56             }
  57             $new_triad = implode(',', $new_parts);
  58             $color = "rgb($new_triad)";
  59         } else {
  60             // hexadecimal handling
  61             if ($color[0] === '#') {
  62                 $hex = substr($color, 1);
  63             } else {
  64                 $hex = $color;
  65                 $color = '#' . $color;
  66             }
  67             $length = strlen($hex);
  68             if ($length !== 3 && $length !== 6) return false;
  69             if (!ctype_xdigit($hex)) return false;
  70         }
  71
  72         return $color;
  73
  74     }
  75
  76 }
  77
  78 // vim: et sw=4 sts=4