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   1  <?php
   2  // $Id: xrds.inc,v 1.2 2007/10/15 09:40:42 goba Exp $
   3  
   4  // Global variables to track parsing state
   5  $xrds_open_elements = array();
   6  $xrds_services = array();
   7  $xrds_current_service = array();
   8  
   9  /**
  10   * Main entry point for parsing XRDS documents
  11   */
  12  function xrds_parse($xml) {
  13    global $xrds_services;
  14  
  15    $parser = xml_parser_create_ns();
  16    xml_set_element_handler($parser, '_xrds_element_start', '_xrds_element_end');
  17    xml_set_character_data_handler($parser, '_xrds_cdata');
  18  
  19    xml_parse($parser, $xml);
  20    xml_parser_free($parser);
  21  
  22    return $xrds_services;
  23  }
  24  
  25  /**
  26   * Parser callback functions
  27   */
  28  function _xrds_element_start(&$parser, $name, $attribs) {
  29    global $xrds_open_elements;
  30  
  31    $xrds_open_elements[] = _xrds_strip_namespace($name);
  32  }
  33  
  34  function _xrds_element_end(&$parser, $name) {
  35    global $xrds_open_elements, $xrds_services, $xrds_current_service;
  36  
  37    $name = _xrds_strip_namespace($name);
  38    if ($name == 'SERVICE') {
  39      if (in_array(OPENID_NS_2_0 .'/signon', $xrds_current_service['types']) ||
  40          in_array(OPENID_NS_2_0 .'/server', $xrds_current_service['types'])) {
  41        $xrds_current_service['version'] = 2;
  42      }
  43      elseif (in_array(OPENID_NS_1_1, $xrds_current_service['types']) ||
  44              in_array(OPENID_NS_1_0, $xrds_current_service['types'])) {
  45        $xrds_current_service['version'] = 1;
  46      }
  47      if (!empty($xrds_current_service['version'])) {
  48        $xrds_services[] = $xrds_current_service;
  49      }
  50      $xrds_current_service = array();
  51    }
  52    array_pop($xrds_open_elements);
  53  }
  54  
  55  function _xrds_cdata(&$parser, $data) {
  56    global $xrds_open_elements, $xrds_services, $xrds_current_service;
  57    $path = strtoupper(implode('/', $xrds_open_elements));
  58    switch ($path) {
  59      case 'XRDS/XRD/SERVICE/TYPE':
  60        $xrds_current_service['types'][] = $data;
  61        break;
  62      case 'XRDS/XRD/SERVICE/URI':
  63        $xrds_current_service['uri'] = $data;
  64        break;
  65      case 'XRDS/XRD/SERVICE/DELEGATE':
  66        $xrds_current_service['delegate'] = $data;
  67        break;
  68      case 'XRDS/XRD/SERVICE/LOCALID':
  69        $xrds_current_service['localid'] = $data;
  70        break;
  71    }
  72  }
  73  
  74  function _xrds_strip_namespace($name) {
  75    // Strip namespacing.
  76    $pos = strrpos($name, ':');
  77    if ($pos !== FALSE) {
  78      $name = substr($name, $pos + 1, strlen($name));
  79    }
  80  
  81    return $name;
  82  }