mailer.js

//This is an utility class to send e-mails to a user on behalf of openhab-cloud
const path = require('path'),
templatesDir   = path.resolve(__dirname, '.', 'templates'),
nodemailer     = require('nodemailer'),
logger = require('./logger.js'),
app = require('./app'),
productionEnv = process.env.NODE_ENV || 'dev';

const Email = require('email-templates');

if (productionEnv === 'production') {
	module.exports.sendEmail = function(email, subject, templateName, locals, cb) {
		let transport;
		try {
			let smtpConfig = {
					host : app.config.mailer.host,
					port : app.config.mailer.port,
					secure : app.config.mailer.secureConnection, // use SSL
					tls : {
						rejectUnauthorized : false
					}
			};
			if(app.config.mailer.user){
				smtpConfig.auth = {
					user : app.config.mailer.user,
					pass : app.config.mailer.password
				};
			}
			transport = nodemailer.createTransport(smtpConfig);
		} catch (error) {
			logger.error('sendMail error occured during SMTP transport: ' + error );
		}
		try {
			const message = {
					from : app.config.mailer.from,
					to : email,
					subject : subject,
					generateTextFromHTML : true
			};
			const emailsender = new Email({
				views : {
					root : templatesDir,
					options : {
						extension : 'ejs'
					}
				},
				transport : transport
			});

			emailsender.send({
				template : templateName,
				message : message,
				locals : locals
			});
			cb(null);
		} catch (error) {
			logger.error('sendMail error occured during sending: ' + error);
		}
	}
} else {
	logger.info('Mailer will emulate sending in development environment');
	module.exports.sendEmail = function(email, subject, templateName, locals, cb) {
		logger.info('Emulating sendEmail to ' + email + ' about ' + subject);
		cb(null);
	}
}