[Wiki] Login Form With email or Whatever

/**
 * 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 $password;
    public $rememberMe;
        public $email; // Email
 
    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('email, password', 'required'),
            // rememberMe needs to be a boolean
            array('rememberMe', 'boolean'),
                        array('email', 'email'), 
            // password needs to be authenticated
            array('password', 'authenticate'),
        );
    }
 
    /**
     * Declares attribute labels.
     */
    public function attributeLabels()
    {
        return array(
            'rememberMe'=>'Remember me next time',
        );
    }
 
    /**
     * 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->email,$this->password);
            if(!$this->_identity->authenticate())
                $this->addError('password','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->email,$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;
    }
}

/**
 * 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
{
    /**
     * @var string email
     */
    public $email;
    const ERROR_EMAIL_INVALID=1;
 
    /**
     * @param string $email
     * @param string $password
     */
    public function __construct($email, $password)
    {
        parent::__construct($email, $password);
        $this->email=$email;
    }
 
    /**
     * Authenticates a user.
     * The example implementation makes sure if the username and password
     * are both 'demo'.
     * In practical applications, this should be changed to authenticate
     * against some persistent user identity storage (e.g. database).
     * @return boolean whether authentication succeeds.
     */
    public function authenticate()
    {
        $users=array(
            // username => password
            'demo@demo.fr'=>'demo',
            'admin@admin.fr'=>'admin'
        );
        if(!isset($users[$this->email]))
            $this->errorCode=self::ERROR_EMAIL_INVALID;
        elseif($users[$this->email]!==$this->password)
            $this->errorCode=self::ERROR_PASSWORD_INVALID;
        else
            $this->errorCode=self::ERROR_NONE;
        return !$this->errorCode;
    }
 
    /**
     * @return mixed
     */
    public function getPassword()
    {
        return $this->password;
    }
 
    /**
     * @return mixed
     */
    public function getEmail()
    {
        return $this->email;
    }
}