GT2king's trade bot - edited by maximilian maliar

//need to install aditional package  - npm install fs

'use strict';

const SteamUser = require('steam-user');
const SteamTotp = require('steam-totp');
const SteamCommunity = require('steamcommunity');
const TradeOfferManager = require('steam-tradeoffer-manager');

const Prices = require('./prices.json');
const config = require('./config.json');
const fs = require("fs");

const client = new SteamUser();
const community = new SteamCommunity();
const manager = new TradeOfferManager({
    steam: client,
    community: community,
    language: 'en'
});

const logOnOptions = {
    accountName: config.username,
    password: config.password,
    twoFactorCode: SteamTotp.generateAuthCode(config.sharedSecret)
};
var offerNumber = 0;

client.logOn(logOnOptions);

client.on('loggedOn', function (){
    console.log('succesfully logged on.');
    client.setPersona(SteamUser.Steam.EPersonaState.Online);
    client.gamesPlayed([440]);
});

client.on("friendMessage", function (steamID, message) {
    if (message == "hi") {
        client.chatMessage(steamID, "hello, this works.");
    }
});

client.on('webSession', function (sessionid, cookies) {
    manager.setCookies(cookies);

    community.setCookies(cookies);
    community.startConfirmationChecker(20000, config.identitySecret);
});

function acceptOffer(offer) {
    offer.accept(function(err){
        community.checkConfirmations();
        if (err) console.log("There was an error accepting the offer.");
    });
}

function declineOffer(offer) {
    offer.decline(function (err){
        if (err) console.log("There was an error declining the offer.");
    });
}

function processOffer(offer) {
    offerNumber++;
    fs.writeFile("offers/offer" + offerNumber + ".json", JSON.stringify(offer));
    if (offer.isGlitched() || offer.state === 11) {
        console.log("Offer was glitched, declining.");
        declineOffer(offer);
    }
    else if (offer.partner.getSteamID64() === config.ownerID) {
        console.log("trade with owner");
        acceptOffer(offer);
    }
    else {
        var ourItems = offer.itemsToGive;
        var theirItems = offer.itemsToReceive;
        var ourValue = 0;
        var theirValue = 0;
        for (var i in ourItems) {
            var item = ourItems[i].market_name;
            if (Prices[item]) {
                ourValue += Prices[item].sell;
            } else {
                console.log("Invalid Item. Declining");
                declineOffer(offer);
                return;
            }
        }
        for (var i in theirItems) {
            var item = theirItems[i].market_name;
            if (Prices[item]) {
                theirValue += Prices[item].buy;
            } else {
                console.log("Invalid Item. Declining");
                declineOffer(offer);
                return;
            }
        }
        console.log("Our value: " + ourValue);
        console.log("Their value: " + theirValue);

        if (ourValue <= theirValue) {
            console.log("offer was accepted");
            acceptOffer(offer);
        } else {
            console.log("Payng under price, declining");
            declineOffer(offer);
        }
    }

}

client.setOption("promptSteamGuardCode", false);

manager.on('newOffer', function (offer) {
    processOffer(offer);
});