ibantools-germany
Version:
IBAN Validator and Generator for German Bank Accounts
52 lines (49 loc) • 2.16 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");
const method51_1 = require("./method51");
exports.default = (number) => {
const paddedNumber = (0, helper_1.paddedAccountNumber)(number);
// Exemption
if (paddedNumber.slice(2, 3) === "9") {
return (0, method51_1.method51NominalAccount)(paddedNumber);
}
// Variation 1
if ((0, method00_1.method00Core)(paddedNumber.slice(3, 10), [2, 1, 2, 1, 2, 1]) === "VALID") {
return "VALID";
}
// Variation 2
if ((0, method00_1.method00Core)(paddedNumber.slice(4, 10), [2, 1, 2, 1, 2]) === "VALID") {
return "VALID";
}
// Variation 3
const digits = (0, helper_1.getDigits)(paddedNumber.slice(4, 10));
const givenCheckDigit = digits.pop();
const weightedDigits = (0, helper_1.weightDigitsRTL)(digits, [2, 1, 2, 1, 2]);
const crossSums = (0, helper_1.calculateCrossSums)(weightedDigits);
const sum = (0, helper_1.calculateSum)(crossSums);
const { difference: calculatedCheckDigit } = (0, helper_1.moduloDifference)(sum, 7, 7);
if (calculatedCheckDigit === 7) {
return givenCheckDigit === 0 ? "VALID" : "INVALID";
}
if (calculatedCheckDigit !== 7 && calculatedCheckDigit === givenCheckDigit) {
return "VALID";
}
return "INVALID";
};