ibantools-germany
Version:
IBAN Validator and Generator for German Bank Accounts
44 lines (41 loc) • 1.82 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 method00_1 = require("./method00");
exports.default = (number) => {
if (Number(number) <= 999999999) {
return (0, method00_1.method00Core)(number, [2, 1, 2, 1, 2, 1, 2, 1, 2]);
}
const digits = (0, helper_1.getDigits)(number);
const givenCheckDigit = digits.pop(); // Check digit is last digit
const transformMatrix = [
[0, 1, 5, 9, 3, 7, 4, 8, 2, 6],
[0, 1, 7, 6, 9, 8, 3, 2, 5, 4],
[0, 1, 8, 4, 6, 2, 9, 5, 7, 3],
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
];
digits.reverse();
const transformedDigits = digits.map((digit, index) => transformMatrix[index % 4][digit]);
const sum = (0, helper_1.calculateSum)(transformedDigits);
const sumUnit = (0, helper_1.getUnitFromNumber)(sum);
const calculatedCheckDigit = (0, helper_1.getUnitFromNumber)(10 - sumUnit);
if (givenCheckDigit === calculatedCheckDigit) {
return "VALID";
}
return "INVALID";
};