za-id/index.js

A small package to help validate South African ID numbers

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var moment = require("moment");
exports.male = "Male";
exports.female = "Female";
var genderCheck = 6;
var southAfricanCheck = 10;
var penultimate = 11;
function validateIdNumber(idNumber, details) {
    if (idNumber.length !== 13 || !/^\d+$/.test(idNumber)) {
        return false;
    }
    var idArray = idNumber.split("").map(function (c) { return parseInt(c); });
    if (idArray[southAfricanCheck] > 1 ||
        idArray[penultimate] < 8 ||
        !validateArray(idArray)) {
        return false;
    }
    var dateOfBirth = extractDateOfBirth(idNumber);
    if (!validateBirthday(dateOfBirth, idNumber)) {
        return false;
    }
    if (details != null) {
        details.dateOfBirth = dateOfBirth.toDate();
        details.gender = idArray[genderCheck] >= 5 ? exports.male : exports.female;
        details.southAfrican = idArray[southAfricanCheck] === 0;
    }
    return true;
}
exports.validateIdNumber = validateIdNumber;
function validateBirthday(dateOfBirth, idNumber) {
    return dateOfBirth.format("YYMMDD") == idNumber.substr(0, 6);
}
function validateArray(idArray) {
    var oddPredicate = function (_, i) { return i % 2 === 0; };
    var evenPredicate = function (_, i) { return i % 2 !== 0; };
    var evenMap = function (n) { return ((n *= 2) > 9 ? n - 9 : n); };
    var reduction = function (a, b) { return a + b; };
    var odds = idArray.filter(oddPredicate).reduce(reduction, 0);
    var evens = idArray
        .filter(evenPredicate)
        .map(evenMap)
        .reduce(reduction, 0);
    var nCheck = odds + evens;
    return nCheck % 10 === 0;
}
function extractDateOfBirth(idNumber) {
    var now = moment();
    var year = idNumber.substr(0, 2);
    var month = idNumber.substr(2, 2);
    var day = idNumber.substr(4, 2);
    var dateOfBirth = moment("20" + year + "-" + month + "-" + day + " 00+0200");
    if (dateOfBirth.isAfter(now)) {
        dateOfBirth = moment("19" + year + "-" + month + "-" + day + " 00+0200");
    }
    return dateOfBirth;
}
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