Yii Authentication and Authorization - yii

Question

I followed steps in this article http://www.yiiframework.com/doc/guide/1.1/en/topics.auth how create login and registration system on my site, but I don't understand where should I put this code, in what file??
$identity=new UserIdentity($username,$password);
if($identity->authenticate())
Yii::app()->user->login($identity);
else
echo $identity->errorMessage;
......
// Logout the current user
Yii::app()->user->logout();

Answer 1

first you should create a LoginForm like this.
<?php
/**
* LoginForm class.
* LoginForm is the data structure for keeping
* user login form data. It is used by the 'login' action of 'SiteController'.
*/
class LoginForm extends CFormModel {
public $username;
public $password;
public $rememberMe;
public $qrcode;
private $_identity;
/**
* Declares the validation rules.
* The rules state that username and password are required,
* and password needs to be authenticated.
*/
public function rules() {
return array(
// username and password are required
array('username, password', 'required'),
// rememberMe needs to be a boolean
array('rememberMe', 'boolean'),
// password needs to be authenticated
array('password', 'authenticate'),
);
}
/**
* Declares attribute labels.
*/
public function attributeLabels() {
return array(
//'rememberMe'=>'Remember me next time',
'rememberMe' => Yii::t('default', 'Remember me next time'),
'username' => Yii::t('default', 'Username'),
'password' => Yii::t('default', 'Password'),
);
}
/**
* Authenticates the password.
* This is the 'authenticate' validator as declared in rules().
*/
public function authenticate($attribute, $params) {
if (!$this->hasErrors()) {
$this->_identity = new UserIdentity($this->username, $this->password);
if (!$this->_identity->authenticate())
$this->addError('password', Yii::t('default', 'Incorrect username or password'));
}
}
/**
* Logs in the user using the given username and password in the model.
* #return boolean whether login is successful
*/
public function login() {
if ($this->_identity === null) {
$this->_identity = new UserIdentity($this->username, $this->password);
// Yii::app()->user->setState("password", $this->password);
//$_SESSION['password'] = $this->password;
$this->_identity->authenticate();
}
if ($this->_identity->errorCode === UserIdentity::ERROR_NONE) {
$duration = $this->rememberMe ? 3600 * 24 * 30 : 0; // 30 days
Yii::app()->user->login($this->_identity, $duration);
return true;
} else
return false;
}
}
second create file UserIdentity like this.
<?php
/**  * UserIdentity represents the data needed to identity a user.
* * It contains the authentication method that checks if the provided
* * data can identity the user.
*/
class UserIdentity extends CUserIdentity {
private $_id;
public $user;
public $usertype;
public function authenticate() {
$user = User::model()->find('LOWER(username)=? or easiio_id=?', array(strtolower($this->username), $this->username));
if ($user === null) {
$this->errorCode = self::ERROR_USERNAME_INVALID;
} else {
//date_default_timezone_set("America/Los_angeles");
$this->_id = $user->id;
$this->usertype = $user->status;
$this->user = $user;
$this->username = $user->username;
$this->setState("user", $user);
$this->setState('username', $user->username);
$this->setState('password', $user->password);
$this->setState('org', $user->org_id);
$user->saveAttributes(array(
'lastlogin' => date("Y-m-d H:i:s", time()),
));
$this->errorCode = self::ERROR_NONE;
}
return $this->errorCode == self::ERROR_NONE;
}
public function getId() {
return $this->_id;
}
}
third login