stdnum
Version:
Standard Number Validation
56 lines • 4.67 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings } from '../util';
import { weightedSum } from '../util/checksum';
function clean(input) {
return strings.cleanUnicode(input, ' -()');
}
const alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
const impl = {
name: 'Hong Kong Identity Card Number',
localName: '香港身份證',
abbreviation: 'HKID',
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 !== 8 && value.length !== 9) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
if (!/^[A-NP-Z]{1,2}[0-9]{6}[0-9A]$/.test(value)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
const [front, check] = strings.splitAt(value, -1);
const sum = (weightedSum(front, {
modulus: 11,
weights: front.length === 7
? [8, 7, 6, 5, 4, 3, 2, 1]
: [9, 8, 7, 6, 5, 4, 3, 2, 1],
alphabet,
}) +
(front.length === 7 ? 5 : 0)) %
11;
if (alphabet[(11 - sum) % 11] !== check) {
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;
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