Easy to use CI Auth System... where are you?

Code:

&lt;?php if (!defined('BASEPATH')) exit('No direct script access allowed');



/*** Brett: Sun May 24 03:10:41 GMT 2009

 * A simple portable authentication library.  ***/



class Authenticate

{

    public $user_table;

    public $user_field_identity;

    public $user_field_password;

    public $user_field_first_name;

    public $user_field_last_name;

    public $user_field_user_id;

    public $referrer;

    public $login_uri;

    public $first_name;

    public $last_name;

    public $user_id;

    public $query;



    private $ci;

    private $auth_pfix;



    function __construct()

    {

        // Instantiate the CI libraries so we can work with them

        $this->ci =& get_instance();

        $this->ci->load->library('session');

        $this->ci->load->library('user_agent');

        $this->ci->load->helper('url');

        $this->ci->load->database();

    }



    function check_credentials($identity, $password)

    {

        $this->ci =& get_instance();

                

                if ( !empty($this->query) ) {

                    $query = $this->ci->db->query($this->query);

                } else {

                   $this->ci->db->where($this->user_field_identity, $identity)

            ->where($this->user_field_password, $password);

                   $query = $this->ci->db->get($this->user_table);

                }

            



        if ( $query->num_rows() > 0 ) {

            $this->ci->session->set_userdata($this->auth_pfix . 'authenticated', TRUE);

            $row = $query->row_array();

            

            if ( !empty($this->user_field_user_id) )

                $this->ci->session->set_userdata($this->auth_pfix . 'user_id', $row[$this->user_field_user_id]);

            if ( !empty($this->user_field_first_name) )

                $this->ci->session->set_userdata($this->auth_pfix . 'user_first_name', $row[$this->user_field_first_name]);

            if ( !empty($this->user_field_last_name) )

                $this->ci->session->set_userdata($this->auth_pfix . 'user_last_name', $row[$this->user_field_last_name]);



            return TRUE;

        }

        return FALSE;

    }



    function logout()

    {

        $this->ci->session->set_userdata($this->auth_pfix . 'authenticated', FALSE);

        $this->ci->session->set_userdata($this->auth_pfix . 'referrer', '');

    }



    function set_intended()

    {

        $referrer = uri_string(); //current url

        if ( strpos($referrer, $this->login_uri) === FALSE )

            $this->ci->session->set_userdata($this->auth_pfix . 'referrer', $referrer);

    }



    function is_logged_in()

    {

        $this->set_intended();

        return ( $this->ci->session->userdata($this->auth_pfix . 'authenticated') ) ? TRUE : FALSE;

    }



    function show_login($url='')

    {

        $login_uri = ( !empty($url) ) ? $url : $this->login_uri;

        redirect( $login_uri );

    }



    function redirect_to_intended()

    {

        redirect($this->referrer);

    }



    function init()

    {

        $this->auth_pfix = preg_replace('/[^a-z]/i', '_', strtolower($this->login_uri) ) . '_';



        $this->referrer = $this->ci->session->userdata($this->auth_pfix . 'referrer');

        $this->user_id         = $this->ci->session->userdata($this->auth_pfix . 'user_id');

        $this->first_name     = $this->ci->session->userdata($this->auth_pfix . 'user_first_name');

        $this->last_name     = $this->ci->session->userdata($this->auth_pfix . 'user_last_name');

    }

}

?&gt;

Code:

function  __construct() {

        parent::Controller();

        $this->load->library('authenticate');

        // authenticate class settings

        $this->authenticate->login_uri = 'reports/login';

        $this->authenticate->user_table = 'Users';

        $this->authenticate->init();

        $this->authenticate->user_field_identity     = 'Username';

        $this->authenticate->user_field_password     = 'Password';

        $this->authenticate->user_field_user_id     = 'PersonID';

        $this->menu_links = array(

            'Floor Report'=>'reports/floor',

            'Accounting Report'=>'reports/accounting'

        );

    }



    function index() {

        if ( $this->authenticate->is_logged_in() ) {

            $data = array();

            $data['menu_links'] = $this->menu_links;

            $this->load->view('reports/index', $data);

        } else {

            $this->authenticate->show_login();

            

        }

    }

    function login()

    {

        $this->load->helper(array('form', 'url'));        

    $this->load->library('form_validation');



        $data = Array();



        $this->form_validation->set_rules('username', 'Username', 'required|callback__login_check');

        $this->form_validation->set_rules('password', 'Password', 'required');

        $this->form_validation->set_message('_login_check', 'Your credentials are invalid. Please try again.');



        if ($this->form_validation->run() == FALSE) {

            $this->load->view('reports/login', $data);

        } else {

            $this->authenticate->redirect_to_intended();

        }

        

    }



    function _login_check($username)

    {

        $password = $this->input->post('password', TRUE);

        return $this->authenticate->check_credentials($username, $password);

    }