<?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
{
	/**
	 * 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()
	{
	


             
		$usuario = MUsuario::model()->findByAttributes(array('usuario'=>$this->username));		
		if ($usuario===null) { //Usuario no existe
			$this->errorCode=self::ERROR_USERNAME_INVALID;
                }else if (trim($usuario->contrasena) !== SHA1($this->password) ) { //Contraseña invalida
			$this->errorCode=self::ERROR_PASSWORD_INVALID;
		} else { // Credenciales correctas						
			$this->setState('usuario', $usuario->usuario);	
                        $this->setState('id', $usuario->id_usuario);
			$this->errorCode=self::ERROR_NONE;
		}
		return !$this->errorCode;


	}
}