stdnum
Version:
Standard Number Validation
55 lines • 5.03 kB
JavaScript
import * as exceptions from '../exceptions';
import { isValidDate, strings, weightedSum } from '../util';
function clean(input) {
return strings.cleanUnicode(input, ' -');
}
const impl = {
name: 'Icelandic Identity Code',
localName: 'Kennitala',
compact(input) {
const [value, err] = clean(input);
if (err) {
throw err;
}
return value;
},
format(input) {
const [value] = clean(input);
return strings.splitAt(value, 6).join('-');
},
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 [dd, mm, yy, , centry] = strings.splitAt(value, 2, 4, 6, 9);
const dayValue = parseInt(dd, 10);
const isOrg = dayValue > 40;
const day = dayValue > 40 ? String(dayValue - 40).padStart(2, '0') : dd;
const year = centry === '9' ? `19${yy}` : `20${yy}`;
if (!isValidDate(year, mm, day)) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
const sum = weightedSum(value, {
modulus: 11,
weights: [3, 2, 7, 6, 5, 4, 3, 2, 1, 0],
});
if (sum !== 0) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
return {
isValid: true,
compact: value,
isIndividual: !isOrg,
isCompany: isOrg,
};
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
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