stdnum
Version:
Standard Number Validation
52 lines • 4.19 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings } from '../util';
import { weightedSum } from '../util/checksum';
function clean(input) {
return strings.cleanUnicode(input, ' -');
}
const validRe = /^[PCGQV]{1}00[A-Z0-9]{8}$/;
const ALPHABET = '0123456789X';
const impl = {
name: 'Taxpayer Identification Number',
localName: '',
abbreviation: 'TIN',
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 !== 11) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
if (!validRe.test(value)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
const [, front, check] = strings.splitAt(value, 1, 10);
const sum = weightedSum(front, {
weights: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
modulus: 11,
});
if (ALPHABET[sum] !== check) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
return {
isValid: true,
compact: value,
isIndividual: value[0] === 'P',
isCompany: value[0] !== 'P',
};
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
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