stdnum
Version:
Standard Number Validation
87 lines • 7.25 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings, weightedSum } from '../util';
import { validate as rcValidate } from './rc';
function clean(input) {
const [value, err] = strings.cleanUnicode(input, ' -');
if (err !== null) {
return [value, err];
}
if (value.startsWith('CZ')) {
return [value.substr(2), null];
}
return [value, null];
}
function checkLegal(value) {
const [front, check] = strings.splitAt(value, -1);
const sum = weightedSum(front, {
modulus: 11,
weights: [8, 7, 6, 5, 4, 3, 2, 1],
});
const v = (11 - sum) % 11;
return (v === 0 ? '1' : String(v % 10)) === check;
}
function checkSpecial(value) {
const [front, check] = strings.splitAt(value, -1);
const sum = weightedSum(front, {
modulus: 11,
weights: [8, 7, 6, 5, 4, 3, 2, 1],
});
const digit = String((8 - ((10 - sum) % 11)) % 10);
return digit === check;
}
const impl = {
name: 'Czech VAT Number',
localName: 'Daňové identifikační číslo',
abbreviation: 'DIČ',
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 (![8, 9, 10].includes(value.length)) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
if (!strings.isdigits(value)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
if (value.length === 8) {
if (value.startsWith('9')) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
if (!checkLegal(value)) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
return {
isValid: true,
compact: value,
isIndividual: false,
isCompany: true,
};
}
if (value.length === 9 && value.startsWith('6')) {
if (!checkSpecial(value)) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
return {
isValid: true,
compact: value,
isIndividual: false,
isCompany: true,
};
}
return rcValidate(value);
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
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