Each part (Frontend, Backend, etc.) should only handle their own works.

Frontend

• Display base UI
• Handle user input (inputted messages, button clicks, etc.)
• Display chat messages, rooms, users

Backend

• Manage WebSocket connections
• Manage internal logics (rooms, room memberships, etc.)
• Handle authentication and authorization
• Route received messages
• Handle Redis pub/sub

Client

• Handle user input
• Handle client-side encryption/decryption
• Handle WebSocket
• Open WebSocket connection to server
• Handle client-side encryption/decryption