auth2.php

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<?php
abstract class Auth2
{
        protected $_error = null;
        
        protected $_login = 'login';
        
        protected $_pass = 'password';
        
        protected $_algos = 'md5';
        
        protected $_key = 'jt2D14KIdRs7LA==';
        
        protected $_checkSession = TRUE;
        
        protected static $_defaultAdapter = 'model';

        public function setLogin($field)
        {
                $this->_login = $field;
        }
        
        public function setPass($field)
        {
                $this->_pass = $field;
        }
        
        public function setKey($key)
        {
                $this->_key = $key;
        }
        
        public function identify ()
        {
                if ($this->isValid()) {
                        return TRUE;
                } else {
                        // check
                        if (isset($_POST['mode']) && $_POST['mode'] === 'auth') {
                                //data was posted.
                                return $this->_check($_POST[$this->_login], $_POST[$this->_pass]);
                        } else {
                                //FAIL
                                return FALSE;
                        }
                }
        }
        
        abstract protected function _check ($username, $password);
        
        public function logout ()
        {
                Session::set($this->_key, FALSE);
                session_destroy();
        }
        
        public function isValid()
        {
                session_regenerate_id();

                if($this->_checkSession){
                        $this->_checkSession();
                }

                return Session::has($this->_key) && Session::get($this->_key) === TRUE;
        }
        
        private function _checkSession()
        {
                Session::set('USERAGENT', $_SERVER['HTTP_USER_AGENT']);
                Session::set('REMOTEADDR', $_SERVER['REMOTE_ADDR']);
                
                if ($_SERVER['REMOTE_ADDR'] !== Session::get('REMOTEADDR') ||
                        $_SERVER['HTTP_USER_AGENT'] !== Session::get('USERAGENT')){
                        session_destroy();
                }
        }
        
        public function setCheckSession($check)
        {
                $this->_checkSession = $check;
        }
        
        public function setAlgos($algos, $salt = NULL)
        {
                $this->_algos = $algos;
        }
        
        public function getError ()
        {
                return $this->_error;
        }
        
        public function setError ($error)
        {
                $this->_error = $error;
        }
        
        public static function log($msg)
        {
                $date = date('Y-m-d', strtotime('now'));
                Logger::custom('AUTH', $msg, "auth-$date.log");
        }

        public static function factory($adapter = NULL)
        {
                if(!$adapter) {
                        $adapter = self::$_defaultAdapter;
                }

                require_once CORE_PATH . "libs/auth2/adapters/{$adapter}_auth.php";
                $class = $adapter.'auth';
                
                return new $class;
        }

        public static function setDefault ($adapter)
        {
                self::$_defaultAdapter = $adapter;
        }
}