library/HTMLPurifier/AttrDef/CSS/Color.php

   1 <?php
   2
   3 require_once 'HTMLPurifier/AttrDef.php';
   4
   5 HTMLPurifier_ConfigSchema::define(
   6     'Core', 'ColorKeywords', array(
   7         'maroon'    => '#800000',
   8         'red'       => '#FF0000',
   9         'orange'    => '#FFA500',
  10         'yellow'    => '#FFFF00',
  11         'olive'     => '#808000',
  12         'purple'    => '#800080',
  13         'fuchsia'   => '#FF00FF',
  14         'white'     => '#FFFFFF',
  15         'lime'      => '#00FF00',
  16         'green'     => '#008000',
  17         'navy'      => '#000080',
  18         'blue'      => '#0000FF',
  19         'aqua'      => '#00FFFF',
  20         'teal'      => '#008080',
  21         'black'     => '#000000',
  22         'silver'    => '#C0C0C0',
  23         'gray'      => '#808080'
  24     ), 'hash', '
  25 Lookup array of color names to six digit hexadecimal number corresponding
  26 to color, with preceding hash mark. Used when parsing colors.
  27 This directive has been available since 2.0.0.
  28 ');
  29
  30 /**
  31  * Validates Color as defined by CSS.
  32  */
  33 class HTMLPurifier_AttrDef_CSS_Color extends HTMLPurifier_AttrDef
  34 {
  35
  36     public function validate($color, $config, &$context) {
  37
  38         static $colors = null;
  39         if ($colors === null) $colors = $config->get('Core', 'ColorKeywords');
  40
  41         $color = trim($color);
  42         if ($color === '') return false;
  43
  44         $lower = strtolower($color);
  45         if (isset($colors[$lower])) return $colors[$lower];
  46
  47         if (strpos($color, 'rgb(') !== false) {
  48             // rgb literal handling
  49             $length = strlen($color);
  50             if (strpos($color, ')') !== $length - 1) return false;
  51             $triad = substr($color, 4, $length - 4 - 1);
  52             $parts = explode(',', $triad);
  53             if (count($parts) !== 3) return false;
  54             $type = false; // to ensure that they're all the same type
  55             $new_parts = array();
  56             foreach ($parts as $part) {
  57                 $part = trim($part);
  58                 if ($part === '') return false;
  59                 $length = strlen($part);
  60                 if ($part[$length - 1] === '%') {
  61                     // handle percents
  62                     if (!$type) {
  63                         $type = 'percentage';
  64                     } elseif ($type !== 'percentage') {
  65                         return false;
  66                     }
  67                     $num = (float) substr($part, 0, $length - 1);
  68                     if ($num < 0) $num = 0;
  69                     if ($num > 100) $num = 100;
  70                     $new_parts[] = "$num%";
  71                 } else {
  72                     // handle integers
  73                     if (!$type) {
  74                         $type = 'integer';
  75                     } elseif ($type !== 'integer') {
  76                         return false;
  77                     }
  78                     $num = (int) $part;
  79                     if ($num < 0) $num = 0;
  80                     if ($num > 255) $num = 255;
  81                     $new_parts[] = (string) $num;
  82                 }
  83             }
  84             $new_triad = implode(',', $new_parts);
  85             $color = "rgb($new_triad)";
  86         } else {
  87             // hexadecimal handling
  88             if ($color[0] === '#') {
  89                 $hex = substr($color, 1);
  90             } else {
  91                 $hex = $color;
  92                 $color = '#' . $color;
  93             }
  94             $length = strlen($hex);
  95             if ($length !== 3 && $length !== 6) return false;
  96             if (!ctype_xdigit($hex)) return false;
  97         }
  98
  99         return $color;
 100
 101     }
 102
 103 }
 104