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 }