📱 MyChatApp

A modern real-time chat application built with .NET, following Clean Architecture principles.
It supports real-time messaging with SignalR, authentication with JWT & Identity, MongoDB persistence, and integrations like Redis caching and Hangfire jobs.

📂 Project Structure

MyChatApp.sln
├── src
│   ├── Core
│   │   ├── MyChatApp.Domain
│   │   └── MyChatApp.Application
│   ├── Infrastructure
│   │   ├── MyChatApp.Infrastructure.Persistence
│   │   ├── MyChatApp.Infrastructure.Identity
│   │   └── MyChatApp.Infrastructure.Shared
│   └── Presentation
│       └── MyChatApp.WebAPI
└── tests
    └── MyChatApp.Application.UnitTests

🏗️ Architecture Overview

The solution follows Clean Architecture and CQRS with MediatR.

1. Domain (Core)

• 💡 Business entities & rules (User, Chat, ChatMember, Message, MessageAttachment,MessageDlivery,MessageReation)

• 🎭 Enums (ChatType , MemberRole , MessageType,MessageStatus,NotificationType,PrivacyLevel,UserStatus)

• 🔔 Shared (Result, Error)

• 🗂️ Repository Interfaces (IRepository,IUserRepository, IChatRepository , IMessageRepository)

2. Application (Use Cases)

• 📝 CQRS: Commands & Queries (``)

• ⚡ MediatR Handlers

• 📤 DTOs (``)

• ✅ FluentValidation for request validation

• 🔄 AutoMapper for mapping between domain & DTOs

• 🌐 External Service Interfaces (``)

3. Infrastructure (Details)

• Persistence

  • MongoDB repositories (MongoDbChatRepository)

  • EF Core + Identity (ApplicationDbContext)

  • SQL migrations

• Identity

  • JWT & refresh token service

  • ASP.NET Core Identity customization

• Shared

  • Hangfire jobs (cleanup, notifications)

  • Redis caching (ICacheService)

  • Email & file storage (future extensions)

4. Presentation (Web API)

• 🌍 ASP.NET Core Web API + SignalR

• 🎮 Controllers: Thin endpoints calling MediatR

• 🔔 SignalR Hubs (``)

• ⚙️ Program.cs: DI, Swagger, Serilog, CORS, JWT, Hangfire setup

• 🛡️ Middleware: Error handling, rate limiter, logging

✅ Features

• 🔐 Authentication & Authorization (JWT + Identity + refresh tokens)

• 💬 Real-time chat (SignalR for groups & 1-to-1 messaging)

• 📦 MongoDB persistence for chat data

• 🗄️ SQL Server with EF Core for user & role management

• 🚀 CQRS with MediatR for clean use case separation

• 📜 FluentValidation for request validation

• ⚡ Redis caching for performance

• ⏱️ Background jobs with Hangfire

• 📊 Logging with Serilog + structured logs

• 📖 Swagger/OpenAPI documentation

🧪 Tests

• Unit Tests → MyChatApp.Application.UnitTests

📌 Roadmap

• 🚧 Basic chat functionality

• 🚧 Authentication & authorization

• 🚧 File sharing (images, docs)

• 🚧 Message search & filters

• 🚧 Push notifications (mobile/web)

🤝 Contributing

Contributions are welcome! Please fork the repo and create a pull request.