library/HTMLPurifier/AttrDef/HTML/ID.php

   1 <?php
   2
   3 /**
   4  * Validates the HTML attribute ID.
   5  * @warning Even though this is the id processor, it
   6  *          will ignore the directive Attr:IDBlacklist, since it will only
   7  *          go according to the ID accumulator. Since the accumulator is
   8  *          automatically generated, it will have already absorbed the
   9  *          blacklist. If you're hacking around, make sure you use load()!
  10  */
  11
  12 class HTMLPurifier_AttrDef_HTML_ID extends HTMLPurifier_AttrDef
  13 {
  14
  15     // ref functionality disabled, since we also have to verify
  16     // whether or not the ID it refers to exists
  17
  18     public function validate($id, $config, $context) {
  19
  20         if (!$config->get('Attr.EnableID')) return false;
  21
  22         $id = trim($id); // trim it first
  23
  24         if ($id === '') return false;
  25
  26         $prefix = $config->get('Attr.IDPrefix');
  27         if ($prefix !== '') {
  28             $prefix .= $config->get('Attr.IDPrefixLocal');
  29             // prevent re-appending the prefix
  30             if (strpos($id, $prefix) !== 0) $id = $prefix . $id;
  31         } elseif ($config->get('Attr.IDPrefixLocal') !== '') {
  32             trigger_error('%Attr.IDPrefixLocal cannot be used unless '.
  33                 '%Attr.IDPrefix is set', E_USER_WARNING);
  34         }
  35
  36         //if (!$this->ref) {
  37             $id_accumulator =& $context->get('IDAccumulator');
  38             if (isset($id_accumulator->ids[$id])) return false;
  39         //}
  40
  41         // we purposely avoid using regex, hopefully this is faster
  42
  43         if (ctype_alpha($id)) {
  44             $result = true;
  45         } else {
  46             if (!ctype_alpha(@$id[0])) return false;
  47             $trim = trim( // primitive style of regexps, I suppose
  48                 $id,
  49                 'A..Za..z0..9:-._'
  50               );
  51             $result = ($trim === '');
  52         }
  53
  54         $regexp = $config->get('Attr.IDBlacklistRegexp');
  55         if ($regexp && preg_match($regexp, $id)) {
  56             return false;
  57         }
  58
  59         if (/*!$this->ref && */$result) $id_accumulator->add($id);
  60
  61         // if no change was made to the ID, return the result
  62         // else, return the new id if stripping whitespace made it
  63         //     valid, or return false.
  64         return $result ? $id : false;
  65
  66     }
  67
  68 }
  69
  70 // vim: et sw=4 sts=4