library/HTMLPurifier/AttrDef/HTML/Pixels.php

   1 <?php
   2
   3 /**
   4  * Validates an integer representation of pixels according to the HTML spec.
   5  */
   6 class HTMLPurifier_AttrDef_HTML_Pixels extends HTMLPurifier_AttrDef
   7 {
   8
   9     protected $max;
  10
  11     public function __construct($max = null) {
  12         $this->max = $max;
  13     }
  14
  15     public function validate($string, $config, $context) {
  16
  17         $string = trim($string);
  18         if ($string === '0') return $string;
  19         if ($string === '')  return false;
  20         $length = strlen($string);
  21         if (substr($string, $length - 2) == 'px') {
  22             $string = substr($string, 0, $length - 2);
  23         }
  24         if (!is_numeric($string)) return false;
  25         $int = (int) $string;
  26
  27         if ($int < 0) return '0';
  28
  29         // upper-bound value, extremely high values can
  30         // crash operating systems, see <http://ha.ckers.org/imagecrash.html>
  31         // WARNING, above link WILL crash you if you're using Windows
  32
  33         if ($this->max !== null && $int > $this->max) return (string) $this->max;
  34
  35         return (string) $int;
  36
  37     }
  38
  39     public function make($string) {
  40         if ($string === '') $max = null;
  41         else $max = (int) $string;
  42         $class = get_class($this);
  43         return new $class($max);
  44     }
  45
  46 }
  47
  48 // vim: et sw=4 sts=4