client.js

"use strict";

const http = require("http");
const https = require("https");

let client = (connection) => {
    let options = {
        host: connection.host, 
        port: connection.port, 
        method: "POST", 
        key: connection.key,
        cert: connection.cert,
        agent: connection.agent,
        pfx: connection.pfx,
        passphrase: connection.passphrase,
        ca: connection.ca,
        ciphers: connection.ciphers,
        rejectUnauthorized: connection.rejectUnauthorized,
        secureProtocol: connection.secureProtocol,
        servername: connection.servername,
        headers: {'Content-Type': 'application/json', host: connection.host}
    };

    if(connection.user && connection.pass){
        options.auth = connection.user + ":" + connection.pass;
    }

    return {
        call: (method, params, cb) => {
            let payload = {method: method, params: [], id: 1, jsonrpc: '2.0'};
            if(params){
                payload.params = params;
            }
            let body = JSON.stringify(payload);
            options.headers['Content-Length'] = Buffer.byteLength(body, 'utf8');

            if(connection.protocol === "https"){
                var req = https.request(options);
            } else {
                var req = http.request(options);
            }

            let data = "";

            req.on('error', (e) => {
                cb(e);
            });

            req.write(JSON.stringify(payload));
            req.on("response", (res) => {

                res.on('data', (chunk) => {
                    data += chunk;
                })
                res.on('end', () => {
                    let response;
                    if(res.statusCode === 200){

                        response = JSON.parse(data);
                        return cb(null, response.result);

                    } else if (res.headers['content-type'] === "application/json"){

                        response = JSON.parse(data);
                        return cb(response.error);

                    } else {

                        return cb(data);
                        
                    }
                })
            })
            req.end();
        }
    }
}

module.exports = client;