app.js

/* Load NodeJS Modules */
var express = require('express');
var path = require('path');
var bodyParser = require('body-parser');

var app = express();
app.use(express.static('public'));

//To Support body on post requests
app.use(bodyParser.urlencoded({
    extended: false
}));
app.use(bodyParser.json());

/* Load Local Modules */
var sl = require('./modules/serviceLayer');

//Default SL options on requests
var slOptions = {
    headers: {
        "Content-Type": "application/json",
        "Accept": "application/json",
    }
}
var output = {};

//First Thing, coonect to SL and store a SessionID
if (!process.env.APIKey) {
    sl.Connect().then((resp) => {
            slOptions.headers["Cookie"] = resp.cookie;
        })
        .catch(error => {
            console.error("Can't Connect to Service Layer");
            console.error(error);
            return; // Abort Execution
        })
} else {
    slOptions.headers["demoDB"] = process.env.B1_COMP_ENV
    slOptions.headers["APIKey"] = process.env.APIKey
}

//EndPoint To retrieve Items from Service Layer
app.get('/GetItems', function (req, res) {
    sl.GetItems(slOptions).then((resp) => {
            res.setHeader('Content-Type', 'application/json');
            res.send(resp);
        })
        .catch(error => {
            console.error("Can't get Items from Service Layer - " + error);
            res.send(error);
        })
});

//EndPoint to Retrieve Environment Variables
app.get('/GetEnv', function (req, res) {
    output.sl = slOptions.headers.Cookie || "API Biz Hub"
    output.instance = 0;
    output.instance = (process.env.CF_INSTANCE_INDEX * 1) + 1
    output.env = process.env.HOME;
    res.send(output);
});

// Root path to retrieve Index.html
app.get('/', function (req, res) {
    res.sendFile(path.join(__dirname, 'views/index.html'));
});


//Start Server
var port = process.env.PORT || 8080
app.listen(port, function () {
    console.log('Example app listening on port ' + port);
});