Login con XML

[whisher]

Ciao,
non so quanto ti possa essere utile
(è di un mio vecchio script) ma meglio che niente

class AuthXml{
    private $doc= null;
    private $fileName= '';
    public function __construct($fileName) {
        if(!file_exists($fileName)){
            throw new FileException('XML file ['.$fileName.'] not found in ['.__CLASS__.']');
        }
        $this->fileName= $fileName;
          $this->doc= new DOMDocument();
    }
    public function load() {
        if(!$this->doc->load($this->fileName)) {
            throw new FileException('Error loading file ['.$this->fileName.'] in class ['.__CLASS__.']');
        }
    }
    public function save() {
        if(!$this->doc->save($this->fileName)){
             throw new FileException('Error saving file ['.$this->fileName.'] in class ['.__CLASS__.']');
        }
    }
    public function select($item,$value){
        $xp= new domxpath($this->doc);
        $query= "/users/user[{$item}/text()='{$value}']";
        $user= $xp->query($query);
        unset($xp);
        return (bool)count($user->item(0));
    }
    public function update($username,$password,$uid){
        $xp= new domxpath($this->doc);
        $query= "/users/user[password/text()='{$password}']";
        $user= $xp->query($query);
        unset($xp);
        if(is_null($user->item(0))) {
            throw new InvalidArgException('Error selecting item ['.$id.'] in ['.__CLASS__.']');
        }
        $item= $this->doc->createElement("user");
        $data= array('username'=>$username,'password'=>$password,'uid'=>$uid);
        foreach($data as $key => $value) {
            $nodespace = $this->doc->createElement($key);
            $nodetext = $this->doc->createTextNode($value);
            $nodespace->appendChild($nodetext);
            $item->appendChild($nodespace);
        }
        $oldnode= $user->item(0);
        $newnode= $this->doc->importNode($item, true);
        $oldnode->parentNode->replaceChild($newnode, $oldnode);
        $this->save();
    }
    final public function __destruct(){
        unset($this->doc);
        unset($this->fileName);
    }
}
class Auth{
    const INVALID_LOGIN = 'Invalid Login';
    private $xml= null;
    public function __construct(AuthXml $xml){
        $this->xml= $xml;
        $this->xml->load();
    }
    public function startAuth($username,$password){
        $this->logOut();
        $username=$this->isValidString($username)?$username:'';
        $password=$this->isValidString($password)?$password:'';
        if($this->xml->select("username",$username)&&$this->xml->select("password",md5($password))){        
            $this->setAuthed($username,$password);
        }
        else{
            Session::setSession('failedLogin',self::INVALID_LOGIN);
        }
    }
    private function setAuthed($username,$password){
        $this->generateUid(time());
        $this->xml->update($username,md5($password),$this->uid);
        Session::deleteSession('uip');
        Session::deleteSession('uid');
        Session::setSession('uip',md5($_SERVER['REMOTE_ADDR']));
        Session::setSession('uid',$this->uid);
    }
    public function checkAuth(){
        $auth = false;
        $uid=isset($_SESSION['uid'])?$_SESSION['uid']:'';
        if($this->isValidUid($uid)){
            if($this->xml->select("uid",$_SESSION['uid']) && ($_SESSION['uip']===md5($_SERVER['REMOTE_ADDR']))){
                $auth= true;
            }
        }
        return $auth;
    } 
    public function logOut(){
        Session::deleteSession('failedLogin');
        Session::deleteSession('uip');
        Session::deleteSession('uid');
    }
    private function generateUid($time){
        $this->uid= md5($time.rand(substr($time,-4),substr($time,-10)));
    }
    private function isValidUid($uid){
        $isValid= true;
        $isValid= preg_match('/^[a-z0-9]{32}$/',$uid);
        settype($isValid,"bool");
        return $isValid;
    }
    private function isValidString($string){
        $isValid= TRUE;
        $isValid= preg_match('/^[A-Za-z0-9\-_]{2,16}$/',$string);
        settype($isValid,"bool");
        return $isValid;
    }
    final public function __destruct(){
        unset($this->xml);
    }
} 

il file xml

<?xml version="1.0" encoding="UTF-8"?>
<users>
<user><username>whisher</username><password>646ae72b89eb812677ea06b31b12a86e</password><uid>e4ccb10319f39c21743c053a3ed34db7</uid></user>
</users>