stdnum
Version:
Standard Number Validation
62 lines • 5.32 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings } from '../util';
import { luhnChecksumValidate, weightedSum } from '../util/checksum';
function clean(input) {
const [value, err] = strings.cleanUnicode(input, ' -.');
if (err) {
return [value, err];
}
if (value.startsWith('0000')) {
return [value.substr(4), null];
}
return [value, null];
}
const impl = {
name: 'Norwegian Bank Account Number',
localName: 'Kontonummer',
abbreviation: 'Konto Nr.',
compact(input) {
const [value, err] = clean(input);
if (err) {
throw err;
}
return value;
},
format(input) {
const [value] = clean(input);
return strings.splitAt(value.padStart(11, '0'), 4, 6).join('.');
},
validate(input) {
const [value, error] = clean(input);
if (error) {
return { isValid: false, error };
}
if (value.length !== 11 && value.length !== 7) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
if (!strings.isdigits(value)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
if (value.length === 7 && !luhnChecksumValidate(value)) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
if (value.length === 11) {
const [front, check] = strings.splitAt(value, -1);
const sum = weightedSum(front, {
weights: [6, 7, 8, 9, 4, 5, 6, 7, 8, 9],
modulus: 11,
});
if (String(sum) !== check) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
}
return {
isValid: true,
compact: value,
isIndividual: false,
isCompany: true,
};
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
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