This project is a high-performance, scalable chat system built with .NET 9. It features a modular architecture with a dedicated real-time chat server and a separate RESTful API for user management.

The system is composed of two main services:

1. WebSocketChatServer: The core real-time service responsible for handling WebSocket connections, managing chat rooms, and broadcasting messages. It uses stream multiplexing for efficient communication.
2. UserApi: A secure, token-based RESTful API for managing users, profiles, and authentication.

• Real-time Chat: Low-latency, bidirectional communication using WebSockets.
• User Management API: Full CRUD functionality for users, including profile updates and password management.
• Secure: Token-based authentication (JWT) and role-based access control (RBAC) for protected endpoints.
• Stream Multiplexing: Utilizes Nerdbank.Streams to handle multiple data streams (e.g., chat, file transfers) over a single connection.
• Scalable & Resilient: Designed for horizontal scaling using Redis for message brokering or caching.
• Data Persistence: Leverages MongoDB for storing user data and chat history.
• Containerized: Fully configured for Docker, allowing for easy and consistent deployment.
• Observability: Integrated with OpenTelemetry for distributed tracing, metrics, and logging.

• Backend: .NET 9, ASP.NET Core
• Real-time Communication: WebSockets, Nerdbank.Streams
• API: RESTful Web API
• Database: MongoDB (MongoDB.EntityFrameworkCore)
• Cache / Message Broker: Redis (StackExchange.Redis)
• Security: JWT Authentication, ASP.NET Core Identity
• Observability: OpenTelemetry
• Deployment: Docker

• .NET 9 SDK
• Docker Desktop (Recommended)
• A running MongoDB instance
• A running Redis instance

1. Clone the repository:

   git clone <your-repository-url>
   cd <project-root>

2. Set up Connection Strings: In both the WebSocketChatServer1 and WebSocketChatServer.UserApi projects, configure your appsettings.json with the connection details for MongoDB and Redis.

3. Configure JWT: In appsettings.json for UserApi, configure the JWT settings (Issuer, Audience, Key).

You can run the services individually using the .NET CLI or run the entire system using Docker.

Using .NET CLI: