mailapi/index.js

'use strict'
require('dotenv').config()
const express = require('express')
var cors = require('cors')
const app = express()
const PORT = process.env.PORT || 8080

const mailer = require('nodemailer').createTransport({
	host: process.env.MAIL_SERVER,
	port: (process.env.MAIL_USER!=null)?587:25,
	auth: (process.env.MAIL_USER!=null)?null:{
		user: process.env.MAIL_USER,
		pass: process.env.MAIL_PASS,
	},
	tls: (process.env.MAIL_USER!=null)?null:{
		rejectUnauthorized: false,
	},
})

// Test mailer
app.get('/', async (req, res) => {
	try {
		await mailer.verify()
		return res.sendStatus(200)
	} catch (err) {
		return res.status(500).send(err)
	}
})

app.use(express.json()).use(cors())
	.options('/').post('/', async (req, res) => {

	// Parse from address		
	let from
	if (req.body['name'] && req.body['email'])
		from = `${req.body['name']} <${req.body['email']}>`
	else if (req.body['name']) from = req.body['name']
	else if (req.body['email']) from = req.body['email']
	else from = 'Anonymous'

	// Log it
	console.log(`Sending message:
	From: ${from}
	Subject: ${req.body.subj}\n${req.body.msg}`)

	// Send email
	let mail_res;
	try {
		mail_res = await mailer.sendMail({
			from: process.env.MAIL_FROM,
			replyTo: from,
			to: process.env.MAIL_TO,
			subject: req.body['subj'],
			text: req.body['msg'],
		})
	} catch (err) {
		console.error(err)
		return res.sendStatus(500)
	}
	console.log(`\t${mail_res.messageId}`)
	return res.sendStatus(200)

}).listen(PORT, () => {
	console.log(`API listening on ${PORT}`)
})