EduVerse Examination System API

A comprehensive RESTful API for online examination and course management system built with ASP.NET Core 8

Features • Tech Stack • Getting Started • API Documentation

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📋 Overview

EduVerse Examination System is a robust and scalable web API designed to facilitate the complete lifecycle of online education - from course creation and student enrollment to exam administration and automated grading.

Key Capabilities

• Course Management: Create, update, and manage courses with instructor assignments
• Student Enrollment: Enroll students in courses and track their progress
• Exam Creation: Build comprehensive exams with multiple question types (MCQ, True/False, Essay)
• Online Testing: Students can take exams with time tracking and auto-submission
• Automated Grading: Instant grading for objective questions with manual review for subjective answers
• Assignment Management: Create and submit assignments with file attachments
• Social Learning: Timeline posts, comments, and course reviews
• Analytics & Reporting: Comprehensive exam results and performance metrics

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🛠️ Tech Stack

Core Technologies

Technology	Version	Purpose
ASP.NET Core	8.0	Web API Framework
C#	12.0	Programming Language
Entity Framework Core	8.0.7	ORM (Object-Relational Mapping)
MS SQL Server	2019+	Relational Database
ASP.NET Core Identity	8.0.7	Authentication & User Management

Key Libraries

• JWT (JSON Web Tokens) - Stateless authentication
• Autofac (8.0.0) - Advanced IoC container
• AutoMapper (13.0.1) - Object-to-object mapping
• Swagger/OpenAPI - API documentation

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🏗️ Architecture & Design Patterns

The project follows Clean Architecture principles with:

Design Patterns Used

1. Repository Pattern

• Abstracts data access layer
• Centralized query logic
• Easier unit testing

2. CQRS (Command Query Responsibility Segregation)

• Separates read and write operations
• Commands for state changes, Queries for data retrieval

3. Service Layer Pattern

• Business logic encapsulation
• Keeps controllers thin

4. DTO Pattern

• API contract separation from domain models
• Enhanced security and versioning

5. Dependency Injection

• Loose coupling via Autofac
• Testable and maintainable code

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📁 Project Structure

EduVerseWebAPI/
│
├── Controllers/              # API Endpoints
├── Models/                   # Domain Entities
├── Data/                     # Database Context
├── Configurations/           # EF Core Fluent API
├── Repositories/             # Data Access Layer
├── Services/                 # Business Logic Layer
├── Mediators/                # CQRS Implementation
├── DTO/                      # Data Transfer Objects
├── ViewModels/               # API Response Models
├── Middlewares/              # Custom Middleware
├── Helpers/                  # Utility Classes
├── Profiles/                 # AutoMapper Profiles
├── Enums/                    # Enumeration Types
├── Exceptions/               # Custom Exceptions
├── Migrations/               # EF Core Migrations
├── AutoFacModule.cs          # DI Configuration
└── Program.cs                # Entry Point

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🚀 Getting Started

Prerequisites

• Visual Studio 2022 (latest version) or VS Code
• .NET 8 SDK - Download
• SQL Server 2019+ - Download
• SSMS - Optional but recommended

Installation Steps

1. Clone the Repository

git clone https://github.com/yourusername/EduVerseWebAPI.git
cd EduVerseWebAPI

2. Configure Database Connection

Update the connection string in appsettings.json:

{
  "ConnectionStrings": {
    "DefaultConnection": "Server=YOUR_SERVER_NAME;Database=EduVerseDB;Trusted_Connection=True;TrustServerCertificate=True;MultipleActiveResultSets=true"
  }
}

Alternative with SQL Authentication:

{
  "ConnectionStrings": {
    "DefaultConnection": "Server=YOUR_SERVER;Database=EduVerseDB;User ID=YOUR_USERNAME;Password=YOUR_PASSWORD;TrustServerCertificate=True"
  }
}

3. Configure JWT Authentication

Update JWT settings in appsettings.json:

{
  "JWT": {
    "ValidIssuer": "https://localhost:7001",
    "ValidAudiance": "https://localhost:4200",
    "Key": "YOUR_SECRET_KEY_MUST_BE_AT_LEAST_32_CHARACTERS_LONG",
    "DurationInMinutes": 60
  }
}

Generate a secure key at: https://8gwifi.org/jwsgen.jsp

4. Install NuGet Packages

dotnet restore

Or manually via Package Manager Console:

Install-Package Microsoft.EntityFrameworkCore -Version 8.0.7
Install-Package Microsoft.EntityFrameworkCore.SqlServer -Version 8.0.7
Install-Package Microsoft.EntityFrameworkCore.Tools -Version 8.0.7
Install-Package Microsoft.AspNetCore.Identity.EntityFrameworkCore -Version 8.0.7
Install-Package Microsoft.AspNetCore.Authentication.JwtBearer -Version 8.0.7
Install-Package AutoMapper.Extensions.Microsoft.DependencyInjection -Version 13.0.1
Install-Package Autofac -Version 8.0.0
Install-Package Autofac.Extensions.DependencyInjection -Version 9.0.0
Install-Package Swashbuckle.AspNetCore -Version 6.6.2

5. Apply Database Migrations

dotnet ef database update

Using Package Manager Console:

Update-Database

6. Run the Application

dotnet run

Or press F5 in Visual Studio

The API will be available at https://localhost:7xxx (check console for exact port)

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📚 API Documentation

Swagger UI: https://localhost:PORT/swagger

Authentication Flow

1. Register:

POST /Account/Register
Content-Type: application/json

{
  "firstName": "John",
  "lastName": "Doe",
  "email": "john.doe@example.com",
  "password": "SecurePassword123!",
  "confirmPassword": "SecurePassword123!",
  "role": "Student"
}

2. Login:

POST /Account/Login
Content-Type: application/json

{
  "email": "john.doe@example.com",
  "password": "SecurePassword123!"
}

3. Use Token:

GET /Course/GetAll
Authorization: Bearer YOUR_JWT_TOKEN

Main Endpoints

Endpoint	Method	Description	Auth
/Account/Register	POST	Register user	❌
/Account/Login	POST	User login	❌
/Course/GetAll	GET	Get courses	✅
/Course/Create	POST	Create course	✅ Instructor
/Exam/Create	POST	Create exam	✅ Instructor
/Exam/TakeExam/{id}	GET	Start exam	✅ Student
/Exam/SubmitExam	POST	Submit answers	✅ Student

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🗄️ Database Schema

Main Entities

• Users (Student, Instructor) - TPH inheritance
• Courses - Course information
• Exams - Exam details and timing
• Questions - Question bank (MCQ, TrueFalse, Essay)
• Choices - Multiple choice options
• ExamQuestions - Exam-Question relationship
• ExamStudents - Student enrollments
• ExamAnswers - Student submissions
• Assignments - Assignment details
• AssignmentSubmissions - Student submissions
• CourseStudents - Course enrollments
• TimelineItems - Course posts
• Comments - Post comments
• CourseReviews - Student ratings

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👥 User Roles

Student

✅ View enrolled courses
✅ Take exams
✅ Submit assignments
✅ View results
✅ Post reviews

Instructor

✅ Create courses & exams
✅ Grade subjective answers
✅ View all results
✅ Manage timeline

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🔐 Security Features

• JWT Authentication with refresh tokens
• Role-based Authorization
• Password Hashing (ASP.NET Identity)
• SQL Injection Prevention (EF Core)
• HTTPS Enforcement
• Soft Delete pattern

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📧 Contact

Project Link: https://github.com/yourusername/EduVerseWebAPI

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Built with ❤️ using ASP.NET Core 8

⭐ Star this repo if you find it helpful!