ibantools-germany
Version:
IBAN Validator and Generator for German Bank Accounts
40 lines (37 loc) • 1.73 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) => {
let paddedNumber = (0, helper_1.paddedAccountNumber)(number);
if (paddedNumber.match(/^[3456]/)) {
paddedNumber = paddedNumber.slice(1);
}
if (paddedNumber.match(/^9/)) {
paddedNumber = paddedNumber.slice(3);
}
const digits = (0, helper_1.getDigits)(paddedNumber.replace(/^0+/, ""));
const givenCheckDigit = digits.pop(); // Check digit is last digit
const weightedDigits = (0, helper_1.weightDigits)(digits, [1, 2, 3, 1, 2, 3, 1, 2, 3], "MULTIPLY_ADD");
const weightedModuloDigits = weightedDigits.map((digit) => digit % 11);
const sum = (0, helper_1.calculateSum)(weightedModuloDigits);
const calculatedCheckDigit = (0, helper_1.getUnitFromNumber)(sum);
if (givenCheckDigit === calculatedCheckDigit) {
return "VALID";
}
return "INVALID";
};