stdnum
Version:
Standard Number Validation
90 lines • 8.66 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings, weightedSum } from '../util';
function clean(input) {
const [value, err] = strings.cleanUnicode(input, ' -/');
if (err !== null) {
return [value, err];
}
if (value.startsWith('GB')) {
return [value.substr(2), null];
}
return [value, null];
}
const impl = {
name: 'United Kingdom (and Isle of Man) VAT Number',
localName: 'Value Added Tax Registration Number',
abbreviation: 'VAT Reg No',
compact(input) {
const [value, err] = clean(input);
if (err) {
throw err;
}
return value;
},
format(input) {
const [value] = clean(input);
return strings.splitAt(value, 3, 7).join(' ');
},
validate(input) {
const [value, error] = clean(input);
if (error) {
return { isValid: false, error };
}
if (value.length === 5) {
if (!strings.isdigits(value.substr(2))) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
const cvalue = parseInt(value.substr(2), 10);
if (value.startsWith('GD') && cvalue >= 500) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
if (value.startsWith('HA') && cvalue < 500) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
}
else if (value.length === 11 &&
(value.startsWith('GD8888') || value.startsWith('HA8888'))) {
if (!strings.isdigits(value.substr(6))) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
const cvalue = parseInt(value.substr(6, 3), 10);
if (value.startsWith('GD') && cvalue >= 500) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
if (value.startsWith('HA') && cvalue < 500) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
if (cvalue % 97 !== parseInt(value.substr(9, 2), 10)) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
}
else if (value.length === 9 || value.length === 12) {
if (!strings.isdigits(value)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
const sum = weightedSum(value.substr(0, 9), {
weights: [8, 7, 6, 5, 4, 3, 2, 10, 1],
modulus: 97,
});
if (Number(value.substring(0, 3)) >= 100) {
if (![0, 42, 55].includes(sum)) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
}
else if (sum !== 0) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
}
else {
return { isValid: false, error: new exceptions.InvalidLength() };
}
return {
isValid: true,
compact: value,
isIndividual: false,
isCompany: true,
};
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
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