stdnum
Version:
Standard Number Validation
51 lines • 4.01 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings } from '../util';
import { weightedSum } from '../util/checksum';
function clean(input) {
return strings.cleanUnicode(input, ' ');
}
const impl = {
name: 'United Kingdom Unique Taxpayer Reference',
localName: 'Unique Taxpayer Reference',
abbreviation: 'UTR',
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 !== 10) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
if (!strings.isdigits(value)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
const [check, back] = strings.splitAt(value, 1);
const sum = weightedSum(back, {
weights: [6, 7, 8, 9, 10, 5, 4, 3, 2],
modulus: 11,
});
const digit = '21987654321'[sum];
if (digit !== check) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
return {
isValid: true,
compact: value,
isIndividual: true,
isCompany: false,
};
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
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