User Authentication Service

A FastAPI service for user authentication using JWT tokens with SQLite database.

Features

• User registration and login
• JWT token-based authentication
• Password hashing with bcrypt
• Protected routes with authentication
• SQLite database with SQLAlchemy ORM
• Alembic migrations

Getting Started

Prerequisites

• Python 3.9+
• pip

Installation

1. Clone the repository:

git clone <repository-url>
cd userauthenticationservice

2. Install dependencies:

pip install -r requirements.txt

3. Set up environment variables:

Create a .env file in the project root directory and add the following variables:

SECRET_KEY=your-secret-key-here
ACCESS_TOKEN_EXPIRE_MINUTES=30

Database Setup

Run the database migrations:

alembic upgrade head

Running the Application

Start the FastAPI server:

uvicorn main:app --reload

The API will be available at http://localhost:8000

API Documentation

Once the server is running, you can access the interactive API documentation at:

• Swagger UI: http://localhost:8000/docs
• ReDoc: http://localhost:8000/redoc

Authentication Flow

1. Register a new user:

   • Endpoint: POST /api/v1/users/
   • Body:

     {
       "email": "user@example.com",
       "username": "username",
       "full_name": "User Name",
       "password": "password123",
       "password_confirm": "password123"
     }
     

2. Login to get an access token:

   • Endpoint: POST /api/v1/auth/token
   • Form data:

     username: user@example.com
     password: password123
     

   • Response:

     {
       "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
       "token_type": "bearer"
     }
     

3. Access protected endpoints:

   • Add the header: Authorization: Bearer <access_token>
   • Example protected endpoint: GET /api/v1/users/me

Environment Variables

Variable	Description	Default
SECRET_KEY	Secret key for JWT token generation	CHANGEME_SECRET_KEY_CHANGEME
ACCESS_TOKEN_EXPIRE_MINUTES	Token expiration time in minutes	30
BACKEND_CORS_ORIGINS	CORS allowed origins	["*"]

Project Structure

.
├── alembic.ini
├── app
│   ├── api
│   │   └── v1
│   │       ├── api.py
│   │       └── endpoints
│   │           ├── auth.py
│   │           ├── protected.py
│   │           └── users.py
│   ├── core
│   │   └── config.py
│   ├── db
│   │   ├── init_db.py
│   │   └── session.py
│   ├── models
│   │   └── user.py
│   ├── schemas
│   │   ├── auth.py
│   │   └── user.py
│   └── services
│       ├── auth.py
│       ├── security.py
│       └── user.py
├── main.py
├── migrations
│   ├── env.py
│   ├── script.py.mako
│   └── versions
│       └── 001_create_users_table.py
└── requirements.txt