# User Authentication Service

A FastAPI-based user authentication service with JWT token authentication and SQLite database.

## Features

- User registration and login
- JWT token-based authentication
- Password hashing with bcrypt
- SQLite database with SQLAlchemy ORM
- Database migrations with Alembic
- CORS enabled for all origins
- Health check endpoint
- Auto-generated API documentation

## Environment Variables

Set the following environment variables before running the application:

- `SECRET_KEY`: JWT secret key for token signing (required for production)

## Installation

1. Install dependencies:
```bash
pip install -r requirements.txt
```

2. Run database migrations:
```bash
alembic upgrade head
```

3. Start the application:
```bash
uvicorn main:app --reload
```

## API Endpoints

### Public Endpoints
- `GET /` - Service information
- `GET /health` - Health check
- `POST /api/v1/auth/register` - User registration
- `POST /api/v1/auth/login` - User login

### Protected Endpoints (require Bearer token)
- `GET /api/v1/users/me` - Get current user info
- `GET /api/v1/users/profile` - Get user profile

## API Documentation

Once the application is running, visit:
- Swagger UI: http://localhost:8000/docs
- ReDoc: http://localhost:8000/redoc
- OpenAPI JSON: http://localhost:8000/openapi.json

## Usage Example

1. Register a new user:
```bash
curl -X POST "http://localhost:8000/api/v1/auth/register" \
     -H "Content-Type: application/json" \
     -d '{"email": "user@example.com", "password": "password123"}'
```

2. Login to get access token:
```bash
curl -X POST "http://localhost:8000/api/v1/auth/login" \
     -H "Content-Type: application/x-www-form-urlencoded" \
     -d "username=user@example.com&password=password123"
```

3. Access protected endpoint:
```bash
curl -X GET "http://localhost:8000/api/v1/users/me" \
     -H "Authorization: Bearer YOUR_ACCESS_TOKEN"
```