<?php
/**
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Andreas Gohr <gohr@cosmocode.de>
 */
if(!defined('DOKU_INC')) die();

if(!defined('DOKU_PLUGIN')) define('DOKU_PLUGIN',DOKU_INC.'lib/plugins/');
require_once(DOKU_PLUGIN.'action.php');

/**
 * All DokuWiki plugins to extend the parser/rendering mechanism
 * need to inherit from this class
 */
class action_plugin_oiddelegate extends DokuWiki_Action_Plugin {

    /**
     * return some info
     */
    function getInfo() {
        return confToHash(dirname(__FILE__).'/plugin.info.txt');
    }

    function register(Doku_Event_Handler $controller) {
        $controller->register_hook('TPL_METAHEADER_OUTPUT','BEFORE', $this, 'handle_metaheader');
    }

    function handle_metaheader(&$event, $param) {
        global $ACT;
        global $ID;
        if($ACT != 'show') return true;

        // read delegate setups from config
        $delegates = confToHash(DOKU_CONF.'openid-delegates.conf');
        $delegate = $delegates[$ID];   // check delegate for current page
        if(!$delegate) $delegate = $delegates['*']; // fall back to default if any
        if(!$delegate) return true;

        list($oid,$server,$provider,$xrds) = preg_split('/\s+/',$delegate,4);
        $oid      = trim($oid);
        $server   = trim($server);
        $provider = trim($provider);
        $xrds     = trim($xrds);

        // openid 1 support
        if($server){
            $event->data['link'][] = array(
                'rel'  => 'openid.server',
                'href' => $server,
            );
            $event->data['link'][] = array(
                'rel'  => 'openid.delegate',
                'href' => $oid,
            );
        }
        // openid 2 support
        if($provider){
            $event->data['link'][] = array(
                'rel'  => 'openid2.provider',
                'href' => $provider,
            );
            $event->data['link'][] = array(
                'rel'  => 'openid2.local_id',
                'href' => $oid,
            );
        }
        // openid 2 + XRDS
        if($xrds){
            $event->data['meta'][] = array(
                'http-equiv'  => 'X-XRDS-Location',
                'href' => $xrds,
            );
        }

        return true;
    }
}