documentid-checksum-validator/lib/CA/sin.js

checksum validation for government doc ids

'use strict';

Object.defineProperty(exports, '__esModule', {
    value: true
});
exports['default'] = isValidDocId;

function isValidDocId(inpValue) {
    var valueArray = inpValue.split('');
    var valid = true;
    // standard multiplier for validating sin
    var multiplierString = [1, 2, 1, 2, 1, 2, 1, 2, 1];
    var sum = 0;

    for (var i = 0; i < multiplierString.length; i++) {
        var value = multiplierString[i] * valueArray[i];
        /* if the value of the multiplication is
         greater then 9 then sum the digits of the number
         and add thaat to the final sum */
        if (value > 9) {
            /* The letiable obtained value denotes the value obtained
               by the product of multiplier string and the value array */
            var obtainedValue = value;
            value = obtainedValue % 10 + Math.floor(obtainedValue / 10);
        }
        sum += value;
    }
    if (sum % 10 !== 0) {
        valid = false;
    }
    return valid;
}

module.exports = exports['default'];