ibantools-germany
Version:
IBAN Validator and Generator for German Bank Accounts
45 lines (42 loc) • 1.8 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");
const method76Core = (number) => {
const digits = (0, helper_1.getDigits)(number.slice(1, 8));
const givenCheckDigit = digits.pop();
const weightedDigits = (0, helper_1.weightDigitsRTL)(digits, [2, 3, 4, 5, 6, 7]);
const sum = (0, helper_1.calculateSum)(weightedDigits);
const calculatedCheckDigit = sum % 11;
if (calculatedCheckDigit === givenCheckDigit) {
return "VALID";
}
return "INVALID";
};
exports.default = (number) => {
const paddedNumber = (0, helper_1.paddedAccountNumber)(number);
// Account type (first digit) must be 0, 4 or 6-9
if (!paddedNumber.match(/^[046789]/)) {
return "INVALID";
}
if (method76Core(paddedNumber) === "VALID") {
return "VALID";
}
// If validation fails, try checking it with trailing
// subaccount number 00 which is allowed to be omitted.
return method76Core(`${number}00`.padStart(10, "0"));
};