Express-Bottender-Messenger-MongoDB: A JavaScript repository from LintangWisesa

Express.js, Bottender.js, Facebook Messenger & MongoDB

Project started: Saturday 30/05/2020 at 8.30 AM (GMT+7).
Project finished: Sunday 31/05/2020 at 8.02 AM (GMT+7).
Created using Express.js, ngrok, Bottender.js, Moment.js, MongoDB & Messenger Webhook.

Facebook Messenger Bot

The chatbot can handle a simple task. When a user start a conversation & says "Hi" or "Hello", it will answer "Hello World!". When a users says something randomly, it will ask for user's name, user's birthday & offer to calculate how many days till user's next birthday.
Data Stored on MongoDB

Everything is stored on MongoDB database named bottender, which has 2 collections: sessions & chats. Every latest user's sessions is stored on sessions collection, while every received messages is stored on chats collection.
REST API

It also has REST API that can be used to access all received messages, access single chat by ID (MongoDB ID) & delete single chat by ID (MongoDB ID).
- GET /messages: show all received messages
- GET /messages/{id}: show single message by MongoDB id
- DELETE /messages/{id}: delete single message by MongoDB id

MongoDB Set Up

Activate your local MongoDB server then open MongoDB shell or its GUI (MongoDB Compass). I prefer use MongoDB shell. Create a database names bottender with 2 collections inside: sessions & chats. To activate MongoDB server execute:
```
$ cd C:\Program Files\MongoDB\Server\4.2\bin
$ mongod
```
MongoDB server has activated. Open new terminal & execute these command to activate MongoDB work shell, create database, database user & collections:
```
$ cd C:\Program Files\MongoDB\Server\4.2\bin
$ mongo

> use bottender
> db.createUser({user:"YOUR_USERNAME", pwd:"YOUR_PASSWORD", roles:["readWrite",  "dbAdmin"]})
> db.createCollection('sessions')
> db.createCollection('chats')
```

Clone & Set Up Project

Simply clone this project from github then install all dependencies needed:

$ git clone https://github.com/LintangWisesa/Express-Bottender-Messenger-MongoDB.git
$ cd Express-Bottender-Messenger-MongoDB
$ npm i

Set Up mongo.config.js

On project root, open mongo.config.js then edit the MongoDB url line with your MongoDB user, password & database.
```
module.exports = {
    url: `mongodb://YOUR_USERNAME:YOUR_PASSWORD@localhost:27017/bottender`,
}
```
Save it.

Connect to Facebook Messenger

To complete our Messenger connection, we have to find these values:
- Messenger Page ID
- Messenger Access Token
- Messenger App ID
- Messenger App Secret
- Messenger Verify Token
To do that, make sure you have an active Facebook Page then signup/login to Facebook for Deveopers. Create an application by click My Apps => Create App. Click Set Up button on Messenger & search for those 5 values (Note: you can set Messenger Verify Token to any text or simply insert your application name).

After that, back to your project directory & create an .env file with these following values:
```
MESSENGER_PAGE_ID=your_page_id
MESSENGER_ACCESS_TOKEN=your_access_token_id
MESSENGER_APP_ID=your_app_id
MESSENGER_APP_SECRET=your_app_secret
MESSENGER_VERIFY_TOKEN=your_app_name
```
Save it.

Run the project

You can run your bot on terminal using Bottender Console or activate it on your Express server.
- Running on Terminal (Bottender Console)
  
  If you want to run this project on console, first open package.json and set these value:
```
"dev": "bottender dev",
"start": "bottender start",
```
  Save, then execute this command:
```
$ npm run dev -- --console
```
  Now you can chat with your bot on terminal.
- Running on Express Server
  
  If you want to run this project on Express server, first open package.json and set these value:
```
"dev": "nodemon server.js",
"start": "node server.js",
```
  Save, then execute this command:
```
$ npm run dev
```
  Now your bot application is run on http://localhost:5000, including its REST API. Try to GET /messages to show all received messages.

Make Public Server

Run your project on Express server, then make it public. You can deploy the project on cloud (for instance: Heroku, AWS or Google Cloud) or in this case I simply use ngrok to create public URL for my project. Download ngrok here then execute from terminal:
```
$ ngrok.exe http 5000
```
Then you'll get these information, including your server's public URL. Note your HTTPS public URL!

Set Webhook & Going Live!

Note your HTTPS public URL, then back to your project. In your project, open new terminal then execute this:
```
$ npx bottender messenger webhook set -w https://YOUR_HTTPS_PUBLIC_URL/webhooks/messenger
```
It will set Messenger webhook, connect your project to Facebook application & your bot will live on your Facebook Page. Try to send a message!

Enjoy ~ 😎