stdnum
Version:
Standard Number Validation
82 lines • 7.13 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings } from '../util';
import * as siren from './siren';
function clean(input) {
const [value, err] = strings.cleanUnicode(input, ' -.');
if (err !== null) {
return [value, err];
}
if (value.startsWith('FR')) {
return [value.substr(2), null];
}
return [value, null];
}
const alphabet = '0123456789ABCDEFGHJKLMNPQRSTUVWXYZ';
const impl = {
name: 'French VAT Number',
localName: "Numéro d'Identification à la Taxe sur la Valeur Ajoutée",
abbreviation: 'n°TVA',
compact(input) {
const [value, err] = clean(input);
if (err) {
throw err;
}
return value;
},
format(input) {
const [value] = clean(input);
return strings.splitAt(value, 2, 5, 8).join(' ');
},
validate(input) {
const [value, error] = clean(input);
if (error) {
return { isValid: false, error };
}
if (value.length !== 11) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
const [check, back] = strings.splitAt(value, 2);
if (!alphabet.includes(check[0]) || !alphabet.includes(check[1])) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
if (!strings.isdigits(back)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
if (value.substring(2, 5) !== '000') {
const r = siren.validate(value.substr(2));
if (!r.isValid) {
return r;
}
}
if (strings.isdigits(check)) {
const sum = (12 + 3 * (parseInt(back, 10) % 97)) % 97;
if (sum !== parseInt(check, 10)) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
}
else {
const c0 = alphabet.indexOf(check[0]);
const c1 = alphabet.indexOf(check[1]);
let cvalue;
if (c0 < 10) {
cvalue = c0 * 24 + c1 - 10;
}
else {
cvalue = c0 * 34 + c1 - 100;
}
const sum = (parseInt(back, 10) + 1 + Math.floor(cvalue / 11)) % 11;
const digit = cvalue % 11;
if (sum !== digit) {
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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