[Summary view]

   1  <?php
   2  
   3  /**
   4   * Validates a rel/rev link attribute against a directive of allowed values
   5   * @note We cannot use Enum because link types allow multiple
   6   *       values.
   7   * @note Assumes link types are ASCII text
   8   */
   9  class HTMLPurifier_AttrDef_HTML_LinkTypes extends HTMLPurifier_AttrDef
  10  {
  11  
  12      /**
  13       * Name config attribute to pull.
  14       * @type string
  15       */
  16      protected $name;
  17  
  18      /**
  19       * @param string $name
  20       */
  21      public function __construct($name)
  22      {
  23          $configLookup = array(
  24              'rel' => 'AllowedRel',
  25              'rev' => 'AllowedRev'
  26          );
  27          if (!isset($configLookup[$name])) {
  28              trigger_error(
  29                  'Unrecognized attribute name for link ' .
  30                  'relationship.',
  31                  E_USER_ERROR
  32              );
  33              return;
  34          }
  35          $this->name = $configLookup[$name];
  36      }
  37  
  38      /**
  39       * @param string $string
  40       * @param HTMLPurifier_Config $config
  41       * @param HTMLPurifier_Context $context
  42       * @return bool|string
  43       */
  44      public function validate($string, $config, $context)
  45      {
  46          $allowed = $config->get('Attr.' . $this->name);
  47          if (empty($allowed)) {
  48              return false;
  49          }
  50  
  51          $string = $this->parseCDATA($string);
  52          $parts = explode(' ', $string);
  53  
  54          // lookup to prevent duplicates
  55          $ret_lookup = array();
  56          foreach ($parts as $part) {
  57              $part = strtolower(trim($part));
  58              if (!isset($allowed[$part])) {
  59                  continue;
  60              }
  61              $ret_lookup[$part] = true;
  62          }
  63  
  64          if (empty($ret_lookup)) {
  65              return false;
  66          }
  67          $string = implode(' ', array_keys($ret_lookup));
  68          return $string;
  69      }
  70  }
  71  
  72  // vim: et sw=4 sts=4