stdnum/lib/cjs/be/personIdentifierHelpers.js

Standard Number Validation

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.toDateArray = toDateArray;
exports.validStructure = validStructure;
exports.validChecksum = validChecksum;
const util_1 = require("../util");
function getApproximatelyNow() {
    const ONE_DAY = 1000 * 60 * 60 * 24;
    return new Date(Date.now() + ONE_DAY);
}
function isInPast(date) {
    return new Date(String(date)) <= getApproximatelyNow();
}
function getFullYears(yy) {
    const yval = typeof yy === 'string' ? parseInt(yy, 10) : yy;
    return [1900 + yval, 2000 + yval];
}
function getFirstSix(number) {
    return util_1.strings.splitAt(number, 6)[0];
}
function getBaseNumber(number) {
    return util_1.strings.splitAt(number, 9)[0];
}
function getChecksum(number) {
    const checksumString = util_1.strings.splitAt(number, 9)[1];
    return parseInt(checksumString, 10);
}
function toDateArray(number) {
    const [yy, mm, dd] = util_1.strings.splitAt(number, 2, 4, 6);
    return [yy, mm, dd];
}
function getValidPastDates(yymmdd) {
    const [yy, mm, dd] = toDateArray(yymmdd);
    return getFullYears(yy)
        .filter(yyyy => (0, util_1.isValidDateCompactYYYYMMDD)(`${yyyy}${mm}${dd}`))
        .map(yyyy => `${yyyy}-${mm}-${dd}`)
        .filter(isInPast);
}
function isUnknownDob(dob) {
    if (['000001', '002001', '004001'].includes(dob)) {
        return true;
    }
    const [yy, mm, dd] = toDateArray(dob);
    return util_1.strings.isdigits(yy) && mm === '00' && util_1.strings.isdigits(dd);
}
function toChecksumBasis(year, baseNumber) {
    return parseInt(year < 2000 ? baseNumber : `${2}${baseNumber}`, 10);
}
function isValidDob(dob) {
    return Boolean(getValidPastDates(dob).length);
}
function defaultToDob(origFirstSix) {
    return origFirstSix;
}
function isValidFirstSix(firstSix, toDob) {
    const dob = toDob(firstSix);
    return isUnknownDob(dob) || isValidDob(dob);
}
function validStructure(number, toDob = defaultToDob) {
    const firstSix = getFirstSix(number);
    return isValidFirstSix(firstSix, toDob);
}
function getChecksumBasesUnknownDob(baseNumber) {
    const firstSix = getFirstSix(baseNumber);
    const [yy] = toDateArray(firstSix);
    return getFullYears(yy)
        .filter(isInPast)
        .map(year => toChecksumBasis(year, baseNumber));
}
function getChecksumBasesForStandardDob(baseNumber, toDob) {
    const firstSix = getFirstSix(baseNumber);
    const dob = toDob(firstSix);
    const validPastDates = getValidPastDates(dob);
    const extractYearFromDate = (date) => parseInt(date.split('-')[0], 10);
    const validPastYears = validPastDates.map(extractYearFromDate);
    return validPastYears.map(year => toChecksumBasis(year, baseNumber));
}
function getChecksumBases(number, toDob) {
    const firstSix = getFirstSix(number);
    const dob = toDob(firstSix);
    const baseNumber = getBaseNumber(number);
    if (isUnknownDob(dob))
        return getChecksumBasesUnknownDob(baseNumber);
    return getChecksumBasesForStandardDob(baseNumber, toDob);
}
function isValidChecksumPair(checksumBasis, checksum) {
    return !((checksumBasis + checksum) % 97);
}
function validChecksum(number, toDob = defaultToDob) {
    const checksumBases = getChecksumBases(number, toDob);
    const checksum = getChecksum(number);
    return checksumBases.some(csb => isValidChecksumPair(csb, checksum));
}
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