ibantools-germany
Version:
IBAN Validator and Generator for German Bank Accounts
64 lines (61 loc) • 2.7 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 method06_1 = require("./method06");
const method91Core = (digits, givenCheckDigit, weights) => {
const weightedDigits = (0, helper_1.weightDigitsRTL)(digits, weights);
const sum = (0, helper_1.calculateSum)(weightedDigits);
const { difference: calculatedCheckDigit } = (0, helper_1.moduloDifference)(sum, 11, 11);
return (0, method06_1.method06Result)(givenCheckDigit, calculatedCheckDigit);
};
const variation1 = (number) => {
const digits = (0, helper_1.getDigits)(number.slice(0, 7));
const givenCheckDigit = digits.pop(); // Check digit is last digit
return method91Core(digits, givenCheckDigit, [2, 3, 4, 5, 6, 7]);
};
const variation2 = (number) => {
const digits = (0, helper_1.getDigits)(number.slice(0, 7));
const givenCheckDigit = digits.pop(); // Check digit is last digit
return method91Core(digits, givenCheckDigit, [7, 6, 5, 4, 3, 2]);
};
const variation3 = (number) => {
const digits = (0, helper_1.getDigits)(number);
const givenCheckDigit = digits.splice(6, 1)[0]; // CheckDigit is 7th digit
return method91Core(digits, givenCheckDigit, [2, 3, 4, 5, 6, 7, 8, 9, 10]);
};
const variation4 = (number) => {
const digits = (0, helper_1.getDigits)(number.slice(0, 7));
const givenCheckDigit = digits.pop(); // Check digit is last digit
return method91Core(digits, givenCheckDigit, [2, 4, 8, 5, 10, 9]);
};
exports.default = (number) => {
const paddedNumber = (0, helper_1.paddedAccountNumber)(number);
if (variation1(paddedNumber) === "VALID") {
return "VALID";
}
if (variation2(paddedNumber) === "VALID") {
return "VALID";
}
if (variation3(paddedNumber) === "VALID") {
return "VALID";
}
if (variation4(paddedNumber) === "VALID") {
return "VALID";
}
return "INVALID";
};