Outline

Initiating Server
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mongod
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Mongod
is the primary daemon process for the MongoDB system.
1
npm start
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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.

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