PHP Login Class

<?php
 
/****************************************************
*
* File:    class.login.php
* Author:  Matt West, 2007
* Purpose: Login class
*
*****************************************************/
 
class Login {
 
    // Public variables
    var $username;
    var $cookie;
 
    function Login() { }
 
    /**
     * login(): Authenticate the user's username & password
     * @param string $username User's username in the DB
     * @param string $password User's password in the DB
     * @param object $DB    MySQL database class object
     * @param string $table Table to query from
     * @returns bool        True if login successful, false if not
     */
 
    function login ($username, $password, $DB, $table = 'users') {
 
        $this->username = $username;
 
        $DB->query("SELECT `username`, `salt`, `password` FROM `$table` WHERE `username` = '$username' LIMIT 1");
 
        return ( $DB->result['password'] == sha1($DB->result['salt'] . $password) ) ? true : false ;
 
    }
 
    /**
     * login_admin(): Authenticate the an admin's username & password
     * @param string $username User's username in the DB
     * @param string $password User's password in the DB
     * @param object $DB    MySQL database class object
     * @param string $table Table to query from
     * @returns bool        True if login successful, false if not
     */
    function login_admin ($username, $password, $DB, $table = 'users') {
 
        $this->username = $username;
 
        $DB->query("SELECT `username`, `salt`, `password`, `user_level` FROM `$table` WHERE `username` = '$username' LIMIT 1");
 
        if ( ( $DB->result['password'] == sha1($DB->result['salt'] . $password) ) && ( $DB->result['user_level'] ) == '3') {
 
            return true;
 
        } else {
 
            return false;
 
        }
 
    }
 
    /**
     * set_cookie():        Set the user's cookie
     * @param string $cookie_name   Name of the cookie
     * @param object $DB    MySQL database class object
     * @param bool $remember Whether to set for 30 days or just this session
     * @param string $table Table to query from
     * @returns bool        True if cookie was sent, false if not
     */
    function set_cookie ($cookie_name, $DB, $remember = true, $table = 'users') {
 
        $expiration = ( $remember ) ? ( time() + (60 * 60 * 24 * 30) ) : null ;
 
        $DB->query("SELECT * FROM `$table` WHERE `username` = '" . $this->username . "' LIMIT 1");
 
        return ( setcookie($cookie_name, base64_encode( 
                                $DB->result['username'] . ":" .
                                $DB->result['id'] . ":" .
                                $DB->result['user_level'] . ":" .
                                $DB->result['first_name'] . ":" .
                                $DB->result['last_name'] ), $expiration) ) ? true : false ;
 
    }
 
    /**
     * is_logged_in():      Check if user is currently logged in
     * @param string $cookie_name   Name of the cookie
     * @returns bool        True if cookie was sent, false if not
     */
    function is_logged_in ($cookie_name) {
 
        $this->cookie = explode(':', base64_decode($_COOKIE[$cookie_name]) );
 
    }
 
    /**
     * is_admin_logged_in(): Check if user is currently logged in
     * @param string $cookie_name   Name of the cookie
     * @returns bool True if cookie was sent, false if not
     */
    function is_admin_logged_in ($cookie_name) {
 
        if ( isset($_COOKIE[$cookie_name]) ) {
 
            $this->cookie = explode(':', base64_decode($_COOKIE[$cookie_name]) );
 
            if ( $this->cookie[2] == 3 ) {
 
                return true;
 
            } else {
 
                return false;
 
            }
 
        } else {
 
            return false;
 
        }
 
    }
 
    /**
     * logout(): Clear the user's cookie
     * @param string $cookie_name   Name of the cookie
     */
    function logout ($cookie_name) {
 
        setcookie($cookie_name, '');
 
    }
 
}
 
?>