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   1  <?php
   2  
   3  /**
   4   * Code for using a proxy XRI resolver.
   5   */
   6  
   7  // Do not allow direct access
   8  defined( '_JEXEC' ) or die( 'Restricted access' );
   9  
  10  require_once 'Auth/Yadis/XRDS.php';
  11  require_once 'Auth/Yadis/XRI.php';
  12  
  13  class Auth_Yadis_ProxyResolver {
  14      function Auth_Yadis_ProxyResolver(&$fetcher, $proxy_url = null)
  15      {
  16          $this->fetcher =& $fetcher;
  17          $this->proxy_url = $proxy_url;
  18          if (!$this->proxy_url) {
  19              $this->proxy_url = Auth_Yadis_getDefaultProxy();
  20          }
  21      }
  22  
  23      function queryURL($xri, $service_type = null)
  24      {
  25          // trim off the xri:// prefix
  26          $qxri = substr(Auth_Yadis_toURINormal($xri), 6);
  27          $hxri = $this->proxy_url . $qxri;
  28          $args = array(
  29                        '_xrd_r' => 'application/xrds+xml'
  30                        );
  31  
  32          if ($service_type) {
  33              $args['_xrd_t'] = $service_type;
  34          } else {
  35              // Don't perform service endpoint selection.
  36              $args['_xrd_r'] .= ';sep=false';
  37          }
  38  
  39          $query = Auth_Yadis_XRIAppendArgs($hxri, $args);
  40          return $query;
  41      }
  42  
  43      function query($xri, $service_types, $filters = array())
  44      {
  45          $services = array();
  46          $canonicalID = null;
  47          foreach ($service_types as $service_type) {
  48              $url = $this->queryURL($xri, $service_type);
  49              $response = $this->fetcher->get($url);
  50              if ($response->status != 200 and $response->status != 206) {
  51                  continue;
  52              }
  53              $xrds = Auth_Yadis_XRDS::parseXRDS($response->body);
  54              if (!$xrds) {
  55                  continue;
  56              }
  57              $canonicalID = Auth_Yadis_getCanonicalID($xri,
  58                                                           $xrds);
  59  
  60              if ($canonicalID === false) {
  61                  return null;
  62              }
  63  
  64              $some_services = $xrds->services($filters);
  65              $services = array_merge($services, $some_services);
  66              // TODO:
  67              //  * If we do get hits for multiple service_types, we're
  68              //    almost certainly going to have duplicated service
  69              //    entries and broken priority ordering.
  70          }
  71          return array($canonicalID, $services);
  72      }
  73  }
  74  
  75  ?>