inc/3rdparty/htmlpurifier/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     /**
  10      * @param string $color
  11      * @param HTMLPurifier_Config $config
  12      * @param HTMLPurifier_Context $context
  13      * @return bool|string
  14      */
  15     public function validate($color, $config, $context)
  16     {
  17         static $colors = null;
  18         if ($colors === null) {
  19             $colors = $config->get('Core.ColorKeywords');
  20         }
  21
  22         $color = trim($color);
  23         if ($color === '') {
  24             return false;
  25         }
  26
  27         $lower = strtolower($color);
  28         if (isset($colors[$lower])) {
  29             return $colors[$lower];
  30         }
  31
  32         if (strpos($color, 'rgb(') !== false) {
  33             // rgb literal handling
  34             $length = strlen($color);
  35             if (strpos($color, ')') !== $length - 1) {
  36                 return false;
  37             }
  38             $triad = substr($color, 4, $length - 4 - 1);
  39             $parts = explode(',', $triad);
  40             if (count($parts) !== 3) {
  41                 return false;
  42             }
  43             $type = false; // to ensure that they're all the same type
  44             $new_parts = array();
  45             foreach ($parts as $part) {
  46                 $part = trim($part);
  47                 if ($part === '') {
  48                     return false;
  49                 }
  50                 $length = strlen($part);
  51                 if ($part[$length - 1] === '%') {
  52                     // handle percents
  53                     if (!$type) {
  54                         $type = 'percentage';
  55                     } elseif ($type !== 'percentage') {
  56                         return false;
  57                     }
  58                     $num = (float)substr($part, 0, $length - 1);
  59                     if ($num < 0) {
  60                         $num = 0;
  61                     }
  62                     if ($num > 100) {
  63                         $num = 100;
  64                     }
  65                     $new_parts[] = "$num%";
  66                 } else {
  67                     // handle integers
  68                     if (!$type) {
  69                         $type = 'integer';
  70                     } elseif ($type !== 'integer') {
  71                         return false;
  72                     }
  73                     $num = (int)$part;
  74                     if ($num < 0) {
  75                         $num = 0;
  76                     }
  77                     if ($num > 255) {
  78                         $num = 255;
  79                     }
  80                     $new_parts[] = (string)$num;
  81                 }
  82             }
  83             $new_triad = implode(',', $new_parts);
  84             $color = "rgb($new_triad)";
  85         } else {
  86             // hexadecimal handling
  87             if ($color[0] === '#') {
  88                 $hex = substr($color, 1);
  89             } else {
  90                 $hex = $color;
  91                 $color = '#' . $color;
  92             }
  93             $length = strlen($hex);
  94             if ($length !== 3 && $length !== 6) {
  95                 return false;
  96             }
  97             if (!ctype_xdigit($hex)) {
  98                 return false;
  99             }
 100         }
 101         return $color;
 102     }
 103 }
 104
 105 // vim: et sw=4 sts=4