stdnum
Version:
Standard Number Validation
64 lines • 5.5 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings, weightedSum } from '../util';
function clean(input) {
return strings.cleanUnicode(input, ' -');
}
export const ALPHABET = '0123456789ABCDEFGHJKLMNPQRSTUVXYWZIO';
const impl = {
localName: '中華民國國民身分證',
abbreviation: 'NATID',
name: 'National ID Number',
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 !== 10) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
const [issuer, gender, code, check] = strings.splitAt(value, 1, 2, 9);
if (!strings.isalpha(issuer)) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
if (!/[1-28-9]/.test(gender)) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
if (!strings.isdigits(code)) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
if (!strings.isdigits(check)) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
const leading = ALPHABET.indexOf(issuer) - 10;
const sum = weightedSum(`${gender}${code}${check}`, {
weights: [8, 7, 6, 5, 4, 3, 2, 1, 1],
alphabet: ALPHABET,
modulus: 10,
}) +
Math.floor(leading / 10 + 1) +
leading * 9;
if (sum % 10 !== 0) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
return {
isValid: true,
compact: value,
isIndividual: true,
isCompany: false,
};
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
export default impl;
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