stdnum
Version:
Standard Number Validation
155 lines • 10.5 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings } from '../util';
import { weightedSum } from '../util/checksum';
function clean(input) {
return strings.cleanUnicode(input, ' ');
}
const OTHER_UEN_ENTITY_TYPES = [
'CC',
'CD',
'CH',
'CL',
'CM',
'CP',
'CS',
'CX',
'DP',
'FB',
'FC',
'FM',
'FN',
'GA',
'GB',
'GS',
'HS',
'LL',
'LP',
'MB',
'MC',
'MD',
'MH',
'MM',
'MQ',
'NB',
'NR',
'PA',
'PB',
'PF',
'RF',
'RP',
'SM',
'SS',
'TC',
'TU',
'VH',
'XL',
];
function validateLocal(value) {
const [front, check] = strings.splitAt(value, -1);
if (!strings.isdigits(front)) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
const sum = weightedSum(front, {
modulus: 11,
weights: [10, 8, 6, 4, 9, 7, 5, 3, 1],
});
const digit = 'ZKCMDNERGWH'[sum];
if (check !== digit) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
return {
isValid: true,
compact: value,
isIndividual: false,
isCompany: true,
};
}
function validateBusiness(value) {
const [front, check] = strings.splitAt(value, -1);
if (!strings.isdigits(front)) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
const sum = weightedSum(front, {
modulus: 11,
weights: [10, 4, 9, 3, 8, 2, 7, 1],
});
const digit = 'XMKECAWLJDB'[sum];
if (check !== digit) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
return {
isValid: true,
compact: value,
isIndividual: false,
isCompany: true,
};
}
function validateOther(value) {
const [kind, year, etype, rest, check] = strings.splitAt(value, 1, 3, 5, -1);
if (!['R', 'S', 'T'].includes(kind)) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
if (!strings.isdigits(year)) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
if (kind === 'T' && parseInt(year, 10) > new Date().getFullYear() % 100) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
if (!OTHER_UEN_ENTITY_TYPES.includes(etype)) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
if (!strings.isdigits(rest)) {
return { isValid: false, error: new exceptions.InvalidComponent() };
}
const alphabet = 'ABCDEFGHJKLMNPQRSTUVWX0123456789';
const digit = alphabet[(weightedSum(value.substr(0, 9), {
weights: [4, 3, 5, 3, 10, 2, 2, 5, 7],
modulus: 11,
alphabet,
}) +
6) %
11];
if (check !== digit) {
return { isValid: false, error: new exceptions.InvalidChecksum() };
}
return {
isValid: true,
compact: value,
isIndividual: false,
isCompany: true,
};
}
const impl = {
name: 'Singapore Unique Entity Number',
localName: 'Unique Entity Number',
abbreviation: 'UEN',
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 (value.length === 9) {
return validateBusiness(value);
}
if (strings.isdigits(value[0])) {
return validateLocal(value);
}
return validateOther(value);
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
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