File indexing completed on 2024-05-26 06:02:31

 <?php
 
 /**
  * Validates a rel/rev link attribute against a directive of allowed values
  * @note We cannot use Enum because link types allow multiple
  *       values.
  * @note Assumes link types are ASCII text
  */
 class HTMLPurifier_AttrDef_HTML_LinkTypes extends HTMLPurifier_AttrDef
 {
 
     /**
      * Name config attribute to pull.
      * @type string
      */
     protected $name;
 
     /**
      * @param string $name
      */
     public function __construct($name)
     {
         $configLookup = array(
             'rel' => 'AllowedRel',
             'rev' => 'AllowedRev'
         );
         if (!isset($configLookup[$name])) {
             trigger_error(
                 'Unrecognized attribute name for link ' .
                 'relationship.',
                 E_USER_ERROR
             );
             return;
         }
         $this->name = $configLookup[$name];
     }
 
     /**
      * @param string $string
      * @param HTMLPurifier_Config $config
      * @param HTMLPurifier_Context $context
      * @return bool|string
      */
     public function validate($string, $config, $context)
     {
         $allowed = $config->get('Attr.' . $this->name);
         if (empty($allowed)) {
             return false;
         }
 
         $string = $this->parseCDATA($string);
         $parts = explode(' ', $string);
 
         // lookup to prevent duplicates
         $ret_lookup = array();
         foreach ($parts as $part) {
             $part = strtolower(trim($part));
             if (!isset($allowed[$part])) {
                 continue;
             }
             $ret_lookup[$part] = true;
         }
 
         if (empty($ret_lookup)) {
             return false;
         }
         $string = implode(' ', array_keys($ret_lookup));
         return $string;
     }
 }
 
 // vim: et sw=4 sts=4