stdnum
Version:
Standard Number Validation
54 lines • 4.69 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings, weightedSum } from '../util';
function clean(input) {
return strings.cleanUnicode(input, ' -');
}
const alphabet = '0123456789ABCDEFGHJKLMNPQRTUWXY';
const impl = {
name: 'Chinese Unified Social Credit Code',
localName: '统一社会信用代码',
abbreviation: 'USCC',
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 !== 18) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
const [front, back, check] = strings.splitAt(value, 8, 17);
if (!strings.isdigits(front)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
if (back.split('').some(v => !alphabet.includes(v))) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
const digit = weightedSum(value.substr(0, 17), {
weights: [1, 3, 9, 27, 19, 26, 16, 17, 20, 29, 25, 13, 8, 24, 10, 30, 28],
modulus: 31,
alphabet,
});
if (alphabet[31 - digit] !== check) {
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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