stdnum
Version:
Standard Number Validation
71 lines • 6.56 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings } from '../util';
function clean(input) {
return strings.cleanUnicode(input, ' ', 'IE');
}
const ALPHABET = 'WABCDEFGHIJKLMNOPQRSTUV';
export function calcCheckDigit(valueIn) {
const value = valueIn.padStart(7, '0');
const d1 = value
.substr(0, 7)
.split('')
.reduce((acc, vv, idx) => {
const v = Number.parseInt(vv, 10);
return acc + (8 - idx) * v;
}, 0);
const d2 = value.length === 8 ? 9 * ALPHABET.indexOf(value[7]) : 0;
return ALPHABET[(d1 + d2) % 23];
}
const impl = {
name: 'Irish VAT Number',
localName: 'Cáin Bhreisluacha',
abbreviation: 'CBL',
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 (!strings.isdigits(value[0]) || !strings.isdigits(value.substr(2, 5))) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
const [front, end] = strings.splitAt(value, 7);
if (!end.split('').every(v => ALPHABET.includes(v))) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
if (strings.isdigits(front)) {
if (value[7] !== calcCheckDigit(`${front}${value.substr(8)}`)) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
}
else if ('ABCDEFGHIJKLMNOPQRSTUVWXYZ+*'.includes(value[1])) {
if (value[7] !== calcCheckDigit(`${value.substr(2, 5)}${value[0]}`)) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
}
else {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
return {
isValid: true,
compact: value,
isIndividual: false,
isCompany: true,
};
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
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