ibantools-germany
Version:
IBAN Validator and Generator for German Bank Accounts
38 lines (35 loc) • 1.68 kB
JavaScript
;
/**
* ibantools-germany
* Copyright (C) 2022-2024 Markus Baumer <markus@baumer.dev>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
Object.defineProperty(exports, "__esModule", { value: true });
const helper_1 = require("../helper");
exports.default = (number) => {
const paddedNumber = (0, helper_1.paddedAccountNumber)(number);
const digits = (0, helper_1.getDigits)(paddedNumber);
const validateDigits = digits.slice(0, 7);
const [givenCheckDigit] = digits.slice(7, 8);
if (digits.slice(8, 9)[0] === 8) {
validateDigits.push(...digits.slice(8, 10));
}
const weightedDigits = (0, helper_1.weightDigits)(validateDigits, [2, 1, 2, 1, 2, 1, 2, 1, 2]);
const crossSumDigits = (0, helper_1.calculateCrossSums)(weightedDigits);
const sum = (0, helper_1.calculateSum)(crossSumDigits);
const calculatedCheckDigit = (0, helper_1.getUnitFromNumber)(10 - (0, helper_1.getUnitFromNumber)(sum));
if (calculatedCheckDigit === givenCheckDigit) {
return "VALID";
}
return "INVALID";
};