stdnum
Version:
Standard Number Validation
84 lines • 6.84 kB
JavaScript
import * as exceptions from '../exceptions';
import { isValidDate, strings, weightedSum } from '../util';
function clean(input) {
return strings.cleanUnicode(input, ' -:');
}
function checkBirthdate(value) {
let [dd, mm, yy, rest] = strings
.splitAt(value, 2, 4, 6, 9)
.map(v => parseInt(v, 10));
if (dd > 40) {
dd -= 40;
}
if (mm > 40) {
mm -= 40;
}
if (rest < 500) {
yy += 1900;
}
else if (rest < 750 && yy > 54) {
yy += 1800;
}
else if (rest < 1000 && yy < 40) {
yy += 2000;
}
else if (rest >= 900 && rest < 1000 && yy >= 40) {
yy += 1900;
}
else {
return false;
}
return isValidDate(String(yy), String(mm), String(dd), true);
}
const impl = {
name: 'Norwegian National Identity Number',
localName: 'Fødselsnummer',
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 !== 11) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
if (!strings.isdigits(value)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
if (!checkBirthdate(value)) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
const [front1, check1] = strings.splitAt(value, 9, 10);
const [front2, check2] = strings.splitAt(value, 10);
const sum1 = weightedSum(front1, {
weights: [3, 7, 6, 1, 8, 9, 4, 5, 2],
modulus: 11,
});
const sum2 = weightedSum(front2, {
weights: [5, 4, 3, 2, 7, 6, 5, 4, 3, 2],
modulus: 11,
});
if (String((11 - sum1) % 11) !== check1 ||
String((11 - sum2) % 11) !== check2) {
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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