dynamic-qris
Version:
Convert static QRIS to dynamic QRIS
79 lines (78 loc) • 2.61 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.pad = pad;
exports.toCRC16 = toCRC16;
exports.getBetween = getBetween;
exports.dataQris = dataQris;
/**
* Pads a number with a leading zero if it's less than 10
* @param number The number to pad
* @returns Padded number as a string
*/
function pad(number) {
return number < 10 ? '0' + number : number.toString();
}
/**
* Computes CRC16 checksum for the input string
* @param input The input string to compute CRC16 for
* @returns Uppercase hex representation of CRC16
*/
function toCRC16(input) {
let crc = 0xFFFF;
for (let i = 0; i < input.length; i++) {
crc ^= input.charCodeAt(i) << 8;
for (let j = 0; j < 8; j++) {
crc = (crc & 0x8000) ? (crc << 1) ^ 0x1021 : crc << 1;
}
}
let hex = (crc & 0xFFFF).toString(16).toUpperCase();
return hex.length === 3 ? "0" + hex : hex;
}
/**
* Extracts a substring between start and end markers
* @param str The input string to search in
* @param start The start marker
* @param end The end marker
* @returns Extracted substring or empty string if not found
*/
function getBetween(str, start, end) {
let startIdx = str.indexOf(start);
if (startIdx === -1)
return "";
startIdx += start.length;
let endIdx = str.indexOf(end, startIdx);
return str.slice(startIdx, endIdx);
}
/**
* Extracts data from a QRIS (Quick Response Indonesian Standard) string
* @param qris The QRIS string to parse
* @returns Object containing extracted QRIS information
*/
function dataQris(qris) {
const nmid = "ID" + getBetween(qris, "15ID", "0303");
const id = qris.includes("A01") ? "A01" : "01";
const merchantName = getBetween(qris, "ID59", "60").substring(2).trim().toUpperCase();
const printData = qris.match(/(?<=ID|COM).+?(?=0118)/g);
if (!printData) {
throw new Error("No print data found in QRIS string");
}
const printCount = printData.length;
const printerName = printData[printCount - 1].split('.');
const printer = printerName.length === 3 ? printerName[1] : printerName[2];
const nnsData = qris.match(/(?<=0118).+?(?=ID)/g);
if (!nnsData) {
throw new Error("No NNS data found in QRIS string");
}
const nns = nnsData[nnsData.length - 1].substring(0, 8);
const crcInput = qris.slice(0, -4);
const crcFromQris = qris.slice(-3);
const crcComputed = toCRC16(crcInput);
return {
nmid,
id,
merchantName,
printer,
nns,
crcIsValid: crcFromQris === crcComputed
};
}