Base subscription service with database

.gitignore

@@ -0,0 +1,8 @@
+.DS_Store
+*/.DS_Store
+Thumbs.db
+db.json
+*.log
+node_modules/
+.vscode/
+.github/

database.js

@@ -0,0 +1,22 @@
+var mongoose = require('mongoose');
+
+var start = function() {
+    return new Promise((resolve, reject) => {
+        //Set up default mongoose connection
+        var mongoDB = 'mongodb://127.0.0.1/kairoscope_dev';
+        mongoose.connect(mongoDB, {useNewUrlParser: true, useUnifiedTopology: true}).then(
+            () => { 
+                /** ready to use. The `mongoose.connect()` promise resolves to mongoose instance. */ 
+                console.log("Database connected");
+                resolve();
+            },
+            err => { 
+                /** handle initial connection error */ 
+                console.log("Error connecting to database");
+                reject(err);
+            }
+        );
+    });
+}
+
+module.exports.start = start;

index.js

@@ -0,0 +1,29 @@
+
+var database = require('./database');
+var register_subscriber = require('./register_subscriber');
+
+const express = require('express')
+const app = express()
+app.use(express.json());
+const port = 3101
+const host = 'http://localhost';
+
+const chalk = require('chalk')
+
+database.start().then(() => {
+    app.post('/register', (req, res) => {
+        console.log(`Received request at ${chalk.italic('\'/register\'')}`);
+        register_subscriber(req.body).then((payload) => {
+            if(payload == undefined) res.status(400).json('');
+            else res.json(payload);
+        })
+        .catch((error) => {
+            console.log(chalk.red(error));
+            res.status(500).json(error);
+        })
+    })
+    
+    app.listen(port, () => {
+      console.log(`Mail Subscription Service listening at ${chalk.cyan(`${host}:${port}`)}`);
+    });
+})

models/subscriber.js

@@ -0,0 +1,23 @@
+var mongoose = require('mongoose');
+
+var Schema = mongoose.Schema;
+
+var SubscriberSchema = new Schema(
+  {
+    first_name: {type: String, required: false, maxLength: 100},
+    last_name: {type: String, required: false, maxLength: 100},
+    email: {type: String, required: true, maxLength: 100},
+    confirmed_subscription: { type: Boolean, default: false },
+    last_updated: { type: Date, default: Date.now() },
+    registration_date: { type: Date, default: Date.now(), immutable: true },
+    registration_attempts : { type: Number, default: 1 }
+  }
+);
+
+SubscriberSchema.methods.attempted_registration = function attempted_registration() {
+  this.registration_attempts += 1;
+  this.last_updated = Date.now();
+};
+
+//Export model
+module.exports = mongoose.model('Subscriber', SubscriberSchema);

package-lock.json

@@ -0,0 +1,650 @@
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+}

package.json

@@ -7,5 +7,10 @@
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "author": "James Peret <james.peret@gmail.com> (http://jamesperet.com)",
-  "license": "ISC"
+  "license": "ISC",
+  "dependencies": {
+    "chalk": "^4.1.2",
+    "express": "^4.17.1",
+    "mongoose": "^6.0.5"
+  }
 }

readme.md

@@ -0,0 +1 @@
+# Mail Subscription Service

register_subscriber.js

@@ -0,0 +1,53 @@
+
+const chalk = require('chalk')
+var Subscriber = require('./models/subscriber');
+
+var register_subscriber = function(data) {
+    return new Promise((resolve, reject) => {
+        if(data.email == '' || data.email == undefined || !validateEmail(data.email)) {
+            console.log(`${chalk.red(`Error: Received data does not contain a valid email address`)}`);
+            console.log(data);
+            resolve(undefined);
+        }
+        Subscriber.findOne({email: data.email}).then((subscriber) => {
+            if(subscriber != undefined) {
+                subscriber.attempted_registration();
+                subscriber.save().then((subscriber) => {
+                    console.log(`Subscriber already in list ${chalk.italic(`\'${subscriber.email}\'`)}`, );
+                    var payload = response_payload(subscriber, true);
+                    resolve(payload);
+                }).catch((error) => { reject(error); });
+                
+            } else {
+                var new_subscriber = new Subscriber(data);
+                new_subscriber.save().then((subscriber) => {
+                    console.log(`Registered new subscriber ${chalk.italic(`\'${subscriber.email}\'`)}`);
+                    var payload = response_payload(subscriber, false);
+                    resolve(payload);
+                }).catch((error) => { reject(error); });
+            }
+        }).catch((error) => { reject(error); });
+    });
+}
+
+var response_payload = function(subscriber, registered) {
+    var payload = {};
+    if(subscriber != undefined) {
+        payload.email = subscriber.email;
+        payload.first_name = subscriber.first_name;
+        payload.last_name = subscriber.last_name;
+        payload.registration_attempts = subscriber.registration_attempts;
+        payload.registration_date = subscriber.registration_date;
+        payload.last_updated = subscriber.last_updated;
+        payload.confirmed_subscription = subscriber.confirmed_subscription;
+    } else payload.confirmed_subscription = false;
+    payload.already_registered = registered;
+    return payload;
+}
+
+var validateEmail = function(email) {
+    const re = /^(([^<>()[\]\.,;:\s@\"]+(\.[^<>()[\]\.,;:\s@\"]+)*)|(\".+\"))@(([^<>()[\]\.,;:\s@\"]+\.)+[^<>()[\]\.,;:\s@\"]{2,})$/i;
+    return re.test(String(email).toLowerCase());
+}
+
+module.exports = register_subscriber;