[Summary view] [Print] [Text view]

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