Outline

Initiating Server

mongod

Mongod

is the primary daemon process for the MongoDB system.

npm start

Starts the node server and executesindex.jsof the project.

Index.js

Mainly performs three tasks in following order:

1. MongoDB connection: Mongoose makes a connection to mongoDB.

2. Socket connection: Starts the socket server (/config/socket.js)

3. Node server: Starts the node server and configure port (/config/express.js)

MongoDB Models

All the mongoDB models or schemas are defined under /server/models.

Socket Server

Socket-server performs following functionalities :

1. Starts the socket server

2. Once when client is connected, it checks for authentication

3. If successfully authenticated, Socket Handler is called to handle different socket scenarios (/server/socketHanlder/index.js)

Socket Handler

• messageHandler : Handles all the chat events between users (message-handler.js)

Express JS

Express JS contains all the configuration details related to node server. It performs the following tasks:

1. Create and start server

2. Add different middleware namely:

3. • bodyParser: Parse body params and attache them to req.body

   • cookieParser: Parse Cookie header and populate req.cookies with an object added as key by the cookie names.

   • Compress: Helps in decreasing the size of the response body and improve the speed of the API calls.

   • Passport: Helps to authenticate different API call.

   • Helmet: Helps to protect the application from different attacks such as cross-site scripting (XSS), script injection.

   • Cors: It helps in connecting the different domain to the application i.e enable cross-origin resource sharing.

   • APIError: Handles any other error that occurred inside of an API calls such as API not found, internal server error, parameter validation error.

   • API route: Manage various other routes of the application (/server/routes/index.js)

Passport JS

This module lets you authenticate endpoints using a JSON web token and passport-jwt. A passport middleware is added to all the routes and socket which will check for authorized token. We can also change the strategy of the passport in the passport-config.jsfile.

Api Routes

It handles the different routes of the application, namely:

• users: This route contains different routes related to the user such as registration of the new user, fetching user details, etc.

• auth: Manages the login, checkUser and logout route. This route handles the authentication of the user by generating the token.

• apartment: Handles the user apartment related route such as getting the apartments of the user, updating apartment details etc.

• messages: handles the chat related routes such as userMessages, loadMore messages etc.

Controllers

Following are the controllers defined for the above-mentioned routes:

• User Controller Performs user related functions, such as:

• • Create new user

  • Get user details

  • Update user-details

  • GetfavouriteUsers

• Auth Controller Performs user authentication tasks: Login ,LogOut, checkUser

• Apartment Controller Defines apartment related functions such as getApartments, update apartment details etc.

• Messages Controller: Defines users chat related functions such as fetch messages, loadMoreMessages, fetch specific user messages etc.