Firesphere / silverstripe-yubiauth

        $member->NoYubikeyCount += 1;

        $member->write();

        $maxNoYubi = self::config()->get('MaxNoYubiLogin');

        if ($maxNoYubi > 0 && $maxNoYubi <= $member->NoYubikeyCount) {

            $validationError = ValidationResult::create(false,

                _t('YubikeyAuthenticator.ERRORMAXYUBIKEY', 'Maximum login without yubikey exceeded'));

            self::updateForm($validationError);

            $member->registerFailedLogin();

            return null;

        }

        $date1 = new DateTime($member->Created);

        $date2 = new DateTime(date('Y-m-d'));

        $diff = $date2->diff($date1)->format("%a");

        $maxNoYubiDays = self::config()->get('MaxNoYubiLoginDays');

        if ($maxNoYubiDays > 0 && $diff >= $maxNoYubiDays) {

            $validationError = ValidationResult::create(false,

                _t('YubikeyAuthenticator.ERRORMAXYUBIKEYDAYS', 'Maximum days without yubikey exceeded'));

            self::updateForm($validationError);

            $member->registerFailedLogin();

            return null;

        }

        return $member;

    }