stdnum
Version:
Standard Number Validation
58 lines • 5.07 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings } from '../util';
import { mod97base10Validate, weightedSum } from '../util/checksum';
function clean(input) {
const [value, err] = strings.cleanUnicode(input, ' -.', 'NL');
if (err) {
return [value, err];
}
const [a, b] = strings.splitAt(value, -3);
return [`${a.padStart(9, '0')}${b}`, null];
}
const impl = {
name: 'Dutch VAT Number',
localName: 'Btw-identificatienummer',
abbreviation: 'Btw-nr.',
compact(input) {
const [value, err] = clean(input);
if (err) {
throw err;
}
return value;
},
format(input) {
const [value] = clean(input);
return value;
},
validate(input) {
const [value, error] = clean(input);
if (error) {
return { isValid: false, error };
}
if (value.length !== 12) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
const [a, b, c] = strings.splitAt(value, 9, 10);
if (!strings.isdigits(a) || !strings.isdigits(c)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
if (b !== 'B') {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
const sum = weightedSum(a, {
weights: [9, 8, 7, 6, 5, 4, 3, 2, -1],
modulus: 11,
});
if (sum % 11 !== 0 && !mod97base10Validate(`NL${a}${b}${c}`)) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
return {
isValid: true,
compact: `${a}${b}${c}`,
isIndividual: false,
isCompany: true,
};
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
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