index.js

var Slack = require('@slack/client');
var request = require('request');
const {CLIENT_EVENTS,WebClient } = require('@slack/client');
var express = require('express');
var http = require('http');
var app = express();

var RtmClient = Slack.RtmClient;
var RTM_EVENTS = Slack.RTM_EVENTS;

var token = process.env.slackToken||config.slackToken;
var appData={};
var rtm = new RtmClient(token, { logLevel: 'info' });
rtm.start();
rtm.on(CLIENT_EVENTS.RTM.AUTHENTICATED, (connectData) => {
    // Cache the data necessary for this app in memory
    appData.selfId = connectData.self.id;
});
rtm.on(RTM_EVENTS.MESSAGE, function(message) {
    var channel = message.channel;
    var text=message.text;
    //send reply only when mentioned or in direct message
    if(text && message.user!==appData.selfId && (text.indexOf(appData.selfId)!==-1 || channel.startsWith('D'))){
        var susiMention="<@"+appData.selfId+">";
        text=text.replace(susiMention,"");
        text=text.toLowerCase();
        var options = {
            method: 'GET',
            url: 'https://api.susi.ai/susi/chat.json',
            qs: {
                timezoneOffset: '-330',
                q: text,
                language:"en"
            }
        };
        //sending request to SUSI API for response
        request(options, function(error, response, body) {
            if (error){
                let msg = "Oops, looks like SUSI is taking a break, She will be back soon";
                rtm.sendMessage(msg, channel);
            } else {
                var msg;
                var actions=(JSON.parse(body)).answers[0].actions;
                actions.forEach(function(action) {
                    var type=action.type;
                    if (type==='table') {
                        var tableData = (JSON.parse(body)).answers[0].data;
                        var columnsObj=action.columns;
                        var maxRows=100;
                        let columns = Object.keys(columnsObj);
                        var columnsData = Object.values(columnsObj);
                        var msgs="";
                        tableData.forEach(function(row,index) {
                            if(row[columns[0]] && index<maxRows){
                                let msg = "*"+row[columns[0]]+"*" + ", " + row[columns[1]] + "\n" + row[columns[2]]+ "\n ";
                                msgs=msgs+msg;
                            }
                        });
                        rtm.sendMessage(msgs, channel);
                    } else if (type === 'rss'){
                        let data = JSON.parse(body).answers[0].data;
                        let columns = type[1];
                        let key = Object.keys(columns);

                        data.forEach(function(row,index) {
                            if(index===0){
                                msg = action.expression;
                                rtm.sendMessage(msg, channel);
                            } else{
                                msg = "";
                                msg =key[1].toUpperCase() + ": " + row[key[1]] + "\n" + key[2].toUpperCase() + ": " + row[key[2]] + "\n" + key[3].toUpperCase() + ": " + row[key[3]];
                                rtm.sendMessage(msg, channel);
                            }
                        });
                    }
                    else{// for type answer
                        msg = action.expression;
                        rtm.sendMessage(msg, channel);
                    }
                });
            }
        });
    }
});

const port = process.env.PORT || 8080;
app.listen(port, () => {
    console.log(`listening on ${port}`);
});