Fix #25: Implement basic email sender

env.example

@@ -6,3 +6,12 @@ PORT=8080
 
 # REDIS_URL specifies Redis server info
 REDIS_URL=redis://127.0.0.1:6379
+
+# NODEMAILER_USERNAME is sender's username credential	
+NODEMAILER_USERNAME=	
+
+# NODEMAILER_PASSWORD is sender's password credential	
+NODEMAILER_PASSWORD=
+
+# NODEMAILER_SERVER is sender's server that they are using (Example: smtp.example.com)
+NODEMAILER_SERVER=	

package.json

@@ -36,6 +36,7 @@
     "feedparser-promised": "^2.0.1",
     "node-summarizer": "^1.0.7",
     "jsdom": "^15.2.1",
+    "nodemailer": "^6.3.1",
     "sentiment": "^5.0.2"
   },
   "devDependencies": {

src/email-sender.js

@@ -0,0 +1,58 @@
+const nodemailer = require('nodemailer');
+
+/*
+                             HOW TO USE
+ Import this file - const sendEmail = require('./email-sender);
+ send email - sendEmail.sendMessage('emailName@hotmail.com','Seneca had an error',
+ '<p>An Error had occured</p>');
+
+ Parameters examples
+ receipiants - 'emailName@hotmail.com,emailName2@hotmail.com'
+ subjectMessage - 'Seneca Telescope had an error'
+ message - '<p>An Error has occurred <br/>Error Message:</p>'
+*/
+
+exports.sendMessage = async function (receipiants, subjectMessage, message) {
+  return new Promise((resolve, reject) => {
+    const transporter = nodemailer.createTransport('SMTP', {
+      // Email Server (.env variable must be used refer to the Contribution.md)
+      host: process.env.NODEMAILER_SERVER,
+      port: 25,
+      secure: false,
+      auth: {
+        // Email Name (.env variables must be used refer to the Contribution.md)
+        user: process.env.NODEMAILER_USERNAME,
+        // Email Pass (.env variables must be used refer to the Contribution.md)
+        pass: process.env.NODEMAILER_PASSWORD,
+      },
+    });
+
+    // verify connection configuration
+    transporter.verify((error, success) => {
+      // If error then print to console
+      if (error) {
+        console.log(error);
+      // else print a ready message
+      } else if (success) {
+        console.log('Server is running properly');
+      }
+    });
+
+    // Email Content
+    const mailOptions = {
+      from: process.env.NODEMAILER_USERNAME, // Email Name
+      to: receipiants, // People to send to
+      subject: subjectMessage, // Subject Line
+      html: message, // Message Body
+    };
+
+    // Send the email with the email content
+    transporter.sendMail(mailOptions, (err, info) => {
+      if (err) {
+        reject(err); // Send promise.reject if an error occurs
+      } else {
+        resolve(info); // Send promise.resolve if an error occurs
+      }
+    });
+  });
+};