code: public function getUser()
  	{
  		if ($this->_user === FALSE) {
  			if (UserModule::$loginType == User::LOGIN_TYPE_EMAIL) {
  				$this->_user = UserIdentity::findByEmail($this->username);
  			} elseif (UserModule::$loginType == User::LOGIN_TYPE_USERNAME) {
  				$this->_user = UserIdentity::findByUsername($this->username);
  			} elseif (UserModule::$loginType == User::LOGIN_TYPE_BOTH) {
  				$this->_user = UserIdentity::findByUsernameOrEmail($this->username);
  			}
  		}
  
  		return $this->_user;
  	}
docs: Finds user by [[username]]
  
  @return User|null