Location: PHPKode > projects > Volunteer Management OpenSource Software > vmoss_alpha02/inc/lib_security/handler_openid.inc
<?php
/**
 *
 * This library helps in authentication ,but not authorization. A vital component of the framework.
 * Developers are required to use this library for security.
 * 
 *
 * PHP version 4 and 5
 *
 * LICENSE: This source file is subject to LGPL license
 * that is available through the world-wide-web at the following URI:
 * http://www.gnu.org/copyleft/lesser.html
 *
 * @package    framework
 * @subpackage security
 * @author     Ravindra De Silva <hide@address.com><hide@address.com>
 * @copyright  Lanka Software Foundation - http://www.opensource.lk
 * @license    http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License (LGPL)
 * 
 */
if($_SESSION['logged_in'] == true){
	return;
}


/*****
PHP OpenID - OpenID consumer and server library

Copyright (C) 2005 Open Source Consulting, SA. and Dan Libby

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

Reciprocal linking.  The author humbly requests that if you should use 
PHP-OpenID on your website to provide an OpenID enabled service that you 
place a link to the author's website ( http://videntity.org ) somewhere 
that your users can discover it.  You are however under no obligation to 
do so.  

More info about PHP OpenID:
hide@address.com
http://videntity.org/openid/

More info about OpenID:
http://www.openid.net

*****/


// Dumb mode identity verification example.
//
// This example is completely stateless, and just requires mod_php >= 4.1.0
// to run.  Stick the php openid tree somewhere beneath your docroot and go nuts. 
// Once you understand this example you'll know the basics of OpenID 
// and using the PH OpenID library.  You can then move on to more 
// robust examples, and integrating OpenID into your app.
//
// Copyright 2005, Janrain, Inc.

// This gets us everything we need to be an openid consumer.

global $global;
require_once($global['approot']."3rd/PHP-OpenID-0.0.8.3/consumer.php");


define('HOST', $_SERVER['SERVER_NAME']);
define('PORT', $_SERVER['SERVER_PORT']);

function my_redirect($url) {
    header( 'Location: ' . $url );
    exit; // okay, so *I* never use exit within a script, but am porting from Python.
}

function formArgstoDict() {
    // Returns a dict of the GET and POST arguments
    return array_merge( $_GET, $_POST );
}

function drawAlert($msg) {
    if( $msg ) {
        return sprintf( '<div id="alert">%s</div>', $msg );
    }
    return '';
}

$_message='';
function setAlert($m) {
    global $_message;
    $_message .= $m;
}

// Our OpenIDConsumer subclass.  See openid.consumer.OpenIDConsumer
// for more more documentation.
class SimpleConsumer extends OpenIDConsumer {
    
    function verify_return_to( $return_to ) {
    
        $parts = parse_url( $return_to );

        if (! isset($parts["port"])) $parts["port"] = ($parts["scheme"] == 'https' ? 443 : 80);

        // you should verify return_to host:port string match host and 
        // port of this server
        if( $parts['host'] != HOST || $parts['port'] != PORT ) {
            return false;
        }

        return true;
    }

};

// A handler with application specific callback logic.
class SimpleActionHandler extends ActionHandler {

    function SimpleActionHandler($query, $consumer) {
        $this->query = $query;
        $this->consumer = $consumer;
    }

    // callbacks
    function doValidLogin($login) {
    	global $global;
    	include_once $global['approot']. 'inc/lib_security/lib_auth.inc';
        // here is where you would do what is necessary to log an openid "user"
        // user into your system.  We just print a message confirming the
        // valid login.
        
     
       
        $user_name=shn_auth_get_openid_user($_SESSION["openid_login"]);
        if($user_name==null){
        	add_error("There is no registered user with the given OpenID");
        	//$_SESSION['user'] = $this->query['open_id'] ;
        }else{
        	$_SESSION['logged_in'] = true;
        	$_SESSION['user']=$user_name;
        }
		
       // setAlert( sprintf( '<b>Identity verified!</b> Thanks, ' .
         //                  '<a href="%s">' .
           //                '%s</a>', $this->query['open_id'], $this->query['open_id'] ) );
    }

    function doInvalidLogin() {
        setAlert('Identity NOT verified!');
    }

    function doUserCancelled() {
        setAlert('Cancelled by user.');
    }

    function doCheckAuthRequired($server_url, $return_to, $post_data) {
        // do openid.mode=check_authentication call, and then change state
        $response = $this->consumer->check_auth($server_url, $return_to, $post_data,
                                                $this->getOpenID());
        $response->doAction($this);
    }

    function doErrorFromServer($message) {
        setAlert('Error from server: ' . $message);
    }

    // helpers
    function createReturnTo($base_url, $identity_url, $args=null) {
        if( !is_array( $args ) ) {
            $args = array();
        }
        $args['open_id'] = $identity_url;
        return oidUtil::append_args($base_url, $args);
    }

    function getOpenID() {
        // return the openid from the original form
        return $this->query['open_id'];
    }
};    


function dispatch() {
    // generate a dictionary of arguments
    $query = formArgstoDict();
    
    // create consumer and handler objects
    $consumer = new SimpleConsumer();
    $handler = new SimpleActionHandler($query, $consumer);

    // extract identity url from arguments.  Will be null if absent from query.
    $identity_url = isset( $query['identity_url'] ) ? $query['identity_url'] : null;

    if( $identity_url ) {
        $ret = $consumer->find_identity_info($identity_url);
        if( !$ret ) {
            setAlert(sprintf('Unable to find openid server for identity url %s', $identity_url) );
        }
        else {
            // found identity server info
            list( $identity_url, $server_id, $server_url ) = $ret;

            // build trust root - this examines the script env and builds
            // based on your running location.  In practice this may be static.
            // You will likely want it to be your entire website, not just
            // this script.
            $_SESSION["openid_login"]=$query['identity_url'];
            $trust_root = isset($_SERVER['SCRIPT_URI']) ? $_SERVER['SCRIPT_URI'] : 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'];

            // build url to application for use in creating return_to
            $app_url = isset($_SERVER['SCRIPT_URI']) ? $_SERVER['SCRIPT_URI'] : 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'];

            // create return_to url from app_url
            $return_to = $handler->createReturnTo($app_url, $identity_url);

            // handle the request
            $redirect_url = $consumer->handle_request(
                $server_id, $server_url, $return_to, $trust_root);

            // redirect the user-agent to the server
            my_redirect($redirect_url);
        }
    }
    // php's url parsing converts '.' to '_'. So we check for both cases.
    else if( isset( $query['openid.mode'] ) || isset( $query['openid_mode'] ) ) {
        // got a request from the server.  build a Request object and pass
        // it off to the consumer object.  OpendIDActionHandler handles
        // the various end cases (see above).
        $openid = $handler->getOpenID();
        $req = new ConsumerRequest($openid, $query, 'GET');
        $response = $consumer->handle_response($req);
		// let our SimpleActionHandler do the work
        $response->doAction($handler);
    }
};    

// dispatch the event based on url args.
dispatch();

?>
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