mail-delivery-service/index.js

const express = require('express')
const app = express()
app.use(express.json())
const port = 3103

var chalk = require("chalk");

var helpers = require('./helpers');

helpers.check_env_variables();
helpers.start_database();


app.get('/', (req, res) => {
   res.send("Mail Delivery Service");
})

app.post('/send', (req, res) => {
    if(req.body == undefined){
        console.log(`Received delivery request for message with no data. Aborting`);
        res.status(400).json({ error: 'No data'}).end();
        return;
    }
    if(req.body.from == "" || req.body.from == undefined){
        console.log(`Received delivery request for message with no from email. Aborting`);
        res.status(400).json({ error: 'Missing \'from\' field'}).end();
        return;
    }
    if(req.body.to == "" || req.body.to == undefined){
        console.log(`Received delivery request for message with no to email. Aborting`);
        res.status(400).json({ error: 'Missing \'to\' field'}).end();
        return;
    }
    if(req.body.message == "" || req.body.message == undefined){
        console.log(`Received delivery request for message with no to message. Aborting`);
        res.status(400).json({ error: 'Missing \'message\' field'}).end();
        return;
    }
    if(req.body.subject == "" || req.body.subject == undefined){
        console.log(`Received delivery request for message with empty subject. Aborting`);
        res.status(400).json({ error: 'Missing \'subject\' field'}).end();
        return;
    } else {
        var subject = chalk.italic(`\'${req.body.subject}\'`);
        console.log(`Received delivery request for message ${subject}`);
    }
    //console.log(req.body);
    res.status(200).end();
    helpers.send_mail(req.body);
})

app.listen(port, () => {
  console.log(`Mail Delivery Service listening at ${chalk.cyan(`http://localhost:${port}`)}`);
})