Added session purge, email templates, email sending, and fixed user bugs

utils.js

@@ -1,20 +1,100 @@
+const fs = require('fs');
+const nodemailer = require("nodemailer");
+var config = require('./config');
 let User = require('./user.model');
 let Session = require('./session.model');
 let Message = require('./message.model');
+var maxSessionLength = config.maxSessionLength;
 
+// purgeSessions() purge sessions that have existed for longer than maxSessionLength
 const purgeSessions = () => {
-    // TODO: Write a function to purge all old session IDs automatically, use cron to schedule
+    console.log("Purging old sessions...");
+    Session.find({}, (err, arr) => {
+        for (let i = 0; i < arr.length; i++) {
+            let timeDifference = new Date().getTime() - arr[i].date;
+            let dayDifference = timeDifference / (1000 * 3600 * 24);
+            if (dayDifference > maxSessionLength) {
+                arr[i].delete().catch(e => {
+                    console.log(e);
+                });
+            }
+        }
+    });
 }
 
+// loadDefaultTemplates() load the default email templates into the database
+// if no template exists for that name
 const loadDefaultTemplates = () => {
-    // TODO: Write a function that loads default mailing templates into the database
+    console.log("Loading default email templates...")
+    fs.readdir('./templates', (err, files) => {
+        files.forEach(file => {
+            fs.readFile('./templates/' + file, 'utf8', function (err, data) {
+                if (err) {
+                    console.log(err);
+                }
+                let name = file.substring(0, file.indexOf('.'));
+                Message.findOne({ name: name }, (err, msg) => {
+                    if (err) {
+                        console.log(err);
+                        return;
+                    }
+                    if (msg) {
+
+                    } else {
+                        let newMsg = Message();
+                        newMsg.name = name;
+                        newMsg.subject = "Email From Kno-Logic" //TODO: Should load these from config.js
+                        newMsg.body = data;
+                        newMsg.save()
+                            .then(() => {
+                                console.log("Loaded " + name + " message");
+                            })
+                            .catch(() => {
+                                console.log("Error loading messages from file.");
+                            });
+                    }
+                });
+            });
+        });
+    });
 }
 
-const sendMail = (user, message) => {
-    // TODO: Write a function that can take in a message and a user and send the email using nodemailer
-}
+// sendMail(user, message, replacements) send an email with message to the user, making
+// replacements in the message
+// replacements is an array of data {from, to}
+const sendMail = async (user, message, replacements) => {
+    console.log("Sending mail...");
 
+    let transporter = nodemailer.createTransport({
+        host: config.mail.host,
+        port: config.mail.port,
+        secure: config.mail.secure, 
+        auth: {
+          user: config.mail.user,
+          pass: config.mail.pass,
+        },
+    });
+
+    let msgBody = message.body;
+
+    for (let i = 0; i < replacements.length; i++) {
+        msgBody = msgBody.replace(replacements[i].from, replacements[i].to);
+    }
+
+    try {
+        await transporter.sendMail({
+            from: config.mail.from, 
+            to: user.email, 
+            subject: message.subject, 
+            text: msgBody, 
+          });
+        
+    } catch (error) {
+        console.log("Error sending mail: ")
+        console.error(error);
+    }
+}
 
 module.exports.purgeSessions = purgeSessions;
 module.exports.loadDefaultTemplates = loadDefaultTemplates;
-module.exports.sendMail = sendMail;
+module.exports.sendMail = sendMail;