iso8583_esm
Version:
A javascript library for messaging in iso 8583 messaging format.
82 lines (81 loc) • 2.61 kB
JavaScript
/**
* This module has helper functions that are useful along side this library.
*/
import { format } from 'date-fns';
export const getPostillionLength = function (buf) {
const div = buf[0];
const rem = buf[1];
return 256 * div + rem;
};
export const extractPostillionData = function (sent) {
// the data is two bytes shorter than what is sent
const buf = Buffer.alloc(sent.byteLength - 2);
// the first to bytes represents the length, the rest is data
for (let i = 2; i < sent.byteLength; i++) {
buf[i - 2] = sent[i];
}
return buf;
};
export const attachPostillionLength = function (_data) {
let data = Buffer.alloc(0);
// make sure _data is a buffer, if it's a string convert
if (!Buffer.isBuffer(_data)) {
if (typeof _data === 'string') {
data = Buffer.alloc(_data.length, _data);
}
}
else {
data = _data;
}
// data is represented by two bytes
const length = Buffer.alloc(2);
length[0] = data.length / 256;
length[1] = data.length % 256;
return Buffer.concat([length, data]);
};
export const attachDiTimeStamps = function (obj) {
if (!obj['7'] || !obj['12'] || !obj['13']) {
const time = new Date();
obj['7'] = format(time, 'MMDDhhmmss');
obj['12'] = format(time, 'hhmmss');
obj['13'] = format(time, 'MMDD');
}
return obj;
};
export const findRequiredFields = function (json = [], key, processing_code, message_code) {
let requiredFields = [];
if (!json)
return requiredFields;
for (let i = 0; i < json.length; i++) {
if (json[i].processing_code === processing_code) {
requiredFields = json[i][key];
if (typeof requiredFields[0] === 'object') {
for (const key in requiredFields[0]) {
if (key === message_code) {
requiredFields = requiredFields[0][key];
}
}
}
}
}
return requiredFields;
};
export const matchValues = function (required_fields, iso_fields) {
const missing_fields = required_fields;
// Refactory to use .filter()
for (let b = 0; b < required_fields.length; b++) {
for (let i = 0; i < iso_fields.length; i++) {
if (required_fields[b] === iso_fields[i]) {
missing_fields.splice(b, 1);
}
}
}
return missing_fields;
};
export const extractBits = function (iso) {
const bits = [];
for (const key in iso) {
bits.push(parseInt(key, 10));
}
return bits;
};