stdnum
Version:
Standard Number Validation
87 lines • 7.28 kB
JavaScript
import * as exceptions from '../exceptions';
import * as egn from './egn';
import * as pnf from './pnf';
import { strings } from '../util';
import { weightedSum } from '../util/checksum';
function clean(input) {
const [value, err] = strings.cleanUnicode(input, ' -/');
if (err !== null) {
return [value, err];
}
if (value.startsWith('BG')) {
return [value.substr(2), null];
}
return [value, err];
}
function checkLegal(value) {
const [front, check] = strings.splitAt(value, -1);
let sum = weightedSum(front, {
modulus: 11,
weights: [1, 2, 3, 4, 5, 6, 7, 8],
});
if (sum === 10) {
sum = weightedSum(front, {
modulus: 11,
weights: [3, 4, 5, 6, 7, 8, 9, 10],
});
}
return String(sum % 10) === check;
}
function checkOther(value) {
const [front, check] = strings.splitAt(value, -1);
const sum = 11 -
weightedSum(front, {
modulus: 11,
weights: [4, 3, 2, 7, 6, 5, 4, 3, 2],
});
return String(sum % 10) !== check;
}
const impl = {
name: 'Bulgarian VAT Number',
localName: 'Идентификационен номер по ДДС',
abbreviation: 'ДДС номер',
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 !== 9 && value.length !== 10) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
if (!strings.isdigits(value)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
if (!['0', '1', '2', '3', '9'].includes(value[0])) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
if (value.length === 9) {
if (!checkLegal(value)) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
}
else if (!egn.validate(value).isValid &&
!pnf.validate(value).isValid &&
!checkOther(value)) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
return {
isValid: true,
compact: value,
isIndividual: value.length === 10,
isCompany: value.length === 9,
};
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
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