<?php
/**
 * @version		$Id: authentication.php 14401 2010-01-26 14:10:00Z louis $
 * @package		Joomla.Framework
 * @subpackage	User
 * @copyright	Copyright (C) 2005 - 2010 Open Source Matters. All rights reserved.
 * @license		GNU/GPL, see LICENSE.php
 * Joomla! is free software. This version may have been modified pursuant
 * to the GNU General Public License, and as distributed it includes or
 * is derivative of works licensed under the GNU General Public License or
 * other free or open source software licenses.
 * See COPYRIGHT.php for copyright notices and details.
 */

// Check to ensure this file is within the rest of the framework
defined('JPATH_BASE') or die();

jimport('joomla.base.observable');

/**
 * This is the status code returned when the authentication is success.
 */
define('JAUTHENTICATE_STATUS_SUCCESS', 1);

/**
 * Status to indicate cancellation of authentication.
 */
define('JAUTHENTICATE_STATUS_CANCEL', 2);

/**
 * This is the status code returned when the authentication failed
 */
define('JAUTHENTICATE_STATUS_FAILURE', 4);

/**
 * Authenthication class, provides an interface for the Joomla authentication system
 *
 * @package 	Joomla.Framework
 * @subpackage	User
 * @since		1.5
 */
class JAuthentication extends JObservable
{
	/**
	 * Constructor
	 *
	 * @access protected
	 */
	function __construct()
	{
		$isLoaded = JPluginHelper::importPlugin('authentication');

		if (!$isLoaded) {
			JError::raiseWarning('SOME_ERROR_CODE', JText::_('JAuthentication::__construct: Could not load authentication libraries.'));
		}
	}

	/**
	 * Returns a reference to a global authentication object, only creating it
	 * if it doesn't already exist.
	 *
	 * This method must be invoked as:
	 * 		<pre>  $auth = &JAuthentication::getInstance();</pre>
	 *
	 * @static
	 * @access public
	 * @return object The global JAuthentication object
	 * @since 1.5
	 */
	function & getInstance()
	{
		static $instances;

		if (!isset ($instances)) {
			$instances = array ();
		}

		if (empty ($instances[0])) {
			$instances[0] = new JAuthentication();
		}

		return $instances[0];
	}

	/**
	 * Finds out if a set of login credentials are valid by asking all obvserving
	 * objects to run their respective authentication routines.
	 *
	 * @access public
	 * @param array 	Array holding the user credentials
	 * @return mixed 	Integer userid for valid user if credentials are valid or
	 * 					boolean false if they are not
	 * @since 1.5
	 */
	function authenticate($credentials, $options)
	{
		// Initialize variables
		$auth = false;

		// Get plugins
		$plugins = JPluginHelper::getPlugin('authentication');

		// Create authencication response
		$response = new JAuthenticationResponse();

		/*
		 * Loop through the plugins and check of the creditials can be used to authenticate
		 * the user
		 *
		 * Any errors raised in the plugin should be returned via the JAuthenticationResponse
		 * and handled appropriately.
		 */
		foreach ($plugins as $plugin)
		{
			$className = 'plg'.$plugin->type.$plugin->name;
			if (class_exists( $className )) {
				$plugin = new $className($this, (array)$plugin);
			}

			// Try to authenticate
			$plugin->onAuthenticate($credentials, $options, $response);

			// If authentication is successfull break out of the loop
			if($response->status === JAUTHENTICATE_STATUS_SUCCESS)
			{
				if (empty( $response->type )) {
					$response->type = isset( $plugin->_name ) ? $plugin->_name : $plugin->name;
				}
   				if (empty( $response->username )) {
					$response->username = $credentials['username'];
				}

				if (empty( $response->fullname )) {
					$response->fullname = $credentials['username'];
				}

				if (empty( $response->password )) {
					$response->password = $credentials['password'];
				}

				break;
			}
		}
		return $response;
	}
}

/**
 * Authorization response class, provides an object for storing user and error details
 *
 * @package 	Joomla.Framework
 * @subpackage	User
 * @since		1.5
 */
class JAuthenticationResponse extends JObject
{
	/**
	 * Response status (see status codes)
	 *
	 * @var type string
	 * @access public
	 */
	var $status 		= JAUTHENTICATE_STATUS_FAILURE;

	/**
	 * The type of authentication that was successful
	 *
	 * @var type string
	 * @access public
	 */
	var $type 		= '';

	/**
	 *  The error message
	 *
	 * @var error_message string
	 * @access public
	 */
	var $error_message 	= '';

	/**
	 * Any UTF-8 string that the End User wants to use as a username.
	 *
	 * @var fullname string
	 * @access public
	 */
	var $username 		= '';

	/**
	 * Any UTF-8 string that the End User wants to use as a password.
	 *
	 * @var password string
	 * @access public
	 */
	var $password 		= '';

	/**
	 * The email address of the End User as specified in section 3.4.1 of [RFC2822]
	 *
	 * @var email string
	 * @access public
	 */
	var $email			= '';

	/**
	 * UTF-8 string free text representation of the End User's full name.
	 *
	 * @var fullname string
	 * @access public
	 */
	var $fullname 		= '';

	/**
	 * The End User's date of birth as YYYY-MM-DD. Any values whose representation uses
	 * fewer than the specified number of digits should be zero-padded. The length of this
	 * value MUST always be 10. If the End User user does not want to reveal any particular
	 * component of this value, it MUST be set to zero.
	 *
	 * For instance, if a End User wants to specify that his date of birth is in 1980, but
	 * not the month or day, the value returned SHALL be "1980-00-00".
	 *
	 * @var fullname string
	 * @access public
	 */
	var $birthdate	 	= '';

	/**
	 * The End User's gender, "M" for male, "F" for female.
	 *
	 * @var fullname string
	 * @access public
	 */
	var $gender 		= '';

	/**
	 * UTF-8 string free text that SHOULD conform to the End User's country's postal system.
	 *
	 * @var fullname string
	 * @access public
	 */
	var $postcode 		= '';

	/**
	 * The End User's country of residence as specified by ISO3166.
	 *
	 * @var fullname string
	 * @access public
	 */
	var $country 		= '';

	/**
	 * End User's preferred language as specified by ISO639.
	 *
	 * @var fullname string
	 * @access public
	 */
	var $language 		= '';

	/**
	 * ASCII string from TimeZone database
	 *
	 * @var fullname string
	 * @access public
	 */
	var $timezone 		= '';

	/**
	 * Constructor
	 *
	 * @param string $name The type of the response
	 * @since 1.5
	 */
	function __construct() { }
}
