Implement authentication service with FastAPI and SQLite

- Setup project structure and dependencies
- Create SQLite database with SQLAlchemy models
- Initialize Alembic for database migrations
- Implement JWT-based authentication utilities
- Create API endpoints for signup, login, and logout
- Add health check endpoint
- Implement authentication middleware for protected routes
- Update README with setup and usage instructions
- Add linting with Ruff

README.md

@@ -1,3 +1,115 @@
-# FastAPI Application
+# Authentication Service
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A simple authentication service built with FastAPI and SQLite, providing JWT-based authentication for user signup, login, and logout functionality.
+
+## Features
+
+- User registration (signup)
+- User authentication (login)
+- User logout
+- JWT-based authentication
+- Protected routes
+- Health check endpoint
+- SQLite database with SQLAlchemy ORM
+- Database migrations with Alembic
+
+## Project Structure
+
+```
+.
+├── alembic.ini                  # Alembic configuration
+├── app                          # Application package
+│   ├── api                      # API endpoints
+│   │   └── endpoints.py         # Auth endpoints
+│   ├── core                     # Core modules
+│   │   ├── auth.py              # Auth utilities
+│   │   ├── config.py            # App configuration
+│   │   └── security.py          # Security utilities
+│   ├── db                       # Database
+│   │   ├── base.py              # Base DB imports
+│   │   └── session.py           # DB session
+│   ├── middleware               # Middleware
+│   │   └── auth.py              # JWT middleware
+│   ├── models                   # Database models
+│   │   └── user.py              # User model
+│   └── schemas                  # Pydantic schemas
+│       ├── token.py             # Token schemas
+│       └── user.py              # User schemas
+├── init_db.py                   # DB initialization script
+├── main.py                      # Application entry point
+├── migrations                   # Alembic migrations
+│   ├── env.py                   # Migration env
+│   ├── script.py.mako           # Migration template
+│   └── versions                 # Migration scripts
+│       └── 001_create_users_table.py
+└── requirements.txt             # Project dependencies
+```
+
+## Installation
+
+1. Clone the repository
+2. Install dependencies:
+
+```bash
+pip install -r requirements.txt
+```
+
+3. Initialize the database:
+
+```bash
+python init_db.py
+```
+
+## Running the Application
+
+```bash
+uvicorn main:app --reload
+```
+
+The application will be available at http://localhost:8000
+
+## API Documentation
+
+Once the application is running, you can access:
+
+- Swagger UI: http://localhost:8000/docs
+- ReDoc: http://localhost:8000/redoc
+
+## API Endpoints
+
+### Authentication
+
+- `POST /api/v1/auth/signup` - Create a new user
+- `POST /api/v1/auth/login` - Login and get access token
+- `POST /api/v1/auth/logout` - Logout (client-side token invalidation)
+
+### User
+
+- `GET /api/v1/users/me` - Get current user information (protected)
+
+### Health Check
+
+- `GET /health` - Check application health and database connectivity
+
+## Authentication Flow
+
+1. **Signup**: Send a POST request to `/api/v1/auth/signup` with user information
+2. **Login**: Send a POST request to `/api/v1/auth/login` to get an access token
+3. **Authenticated Requests**: Include the token in the Authorization header as `Bearer <token>`
+4. **Logout**: Client should remove the token from storage
+
+## Security
+
+- Passwords are hashed using Bcrypt
+- JWT tokens are used for authentication
+- Token expiration is configurable in settings
+- Protected routes are secured with OAuth2PasswordBearer dependency
+
+## Configuration
+
+Configuration is handled through environment variables and the `app/core/config.py` file.
+
+Important settings:
+- `SECRET_KEY`: Used for JWT token signing (change in production)
+- `ACCESS_TOKEN_EXPIRE_MINUTES`: Token expiration time
+- `SQLALCHEMY_DATABASE_URL`: Database connection string

alembic.ini

@@ -0,0 +1,85 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = migrations
+
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# timezone to use when rendering the date
+# within the migration file as well as the filename.
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; this defaults
+# to migrations/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path
+# version_locations = %(here)s/bar %(here)s/bat migrations/versions
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+# SQLite URL - using absolute path
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks=black
+# black.type=console_scripts
+# black.entrypoint=black
+# black.options=-l 79
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

app/api/endpoints.py

@@ -0,0 +1,112 @@
+from datetime import timedelta
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordRequestForm
+from sqlalchemy.orm import Session
+
+from app.core.auth import get_current_user
+from app.core.config import settings
+from app.core.security import create_access_token, get_password_hash, verify_password
+from app.db.session import get_db
+from app.models.user import User
+from app.schemas.token import Token
+from app.schemas.user import User as UserSchema
+from app.schemas.user import UserCreate
+
+router = APIRouter()
+
+
+@router.post("/auth/signup", response_model=UserSchema)
+def create_user(
+    user_in: UserCreate,
+    db: Session = Depends(get_db)
+) -> Any:
+    """Create a new user
+    """
+    # Check if user with this email or username already exists
+    user = db.query(User).filter(
+        (User.email == user_in.email) | (User.username == user_in.username)
+    ).first()
+    if user:
+        if user.email == user_in.email:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Email already registered"
+            )
+        else:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Username already taken"
+            )
+
+    # Create new user
+    user = User(
+        email=user_in.email,
+        username=user_in.username,
+        hashed_password=get_password_hash(user_in.password),
+        is_active=True
+    )
+    db.add(user)
+    db.commit()
+    db.refresh(user)
+
+    return user
+
+
+@router.post("/auth/login", response_model=Token)
+def login_access_token(
+    form_data: OAuth2PasswordRequestForm = Depends(),
+    db: Session = Depends(get_db)
+) -> Any:
+    """Get the JWT for a user with data from OAuth2 request form body
+    """
+    # Try to authenticate with username
+    user = db.query(User).filter(User.username == form_data.username).first()
+
+    # If user not found by username, try email
+    if not user:
+        user = db.query(User).filter(User.email == form_data.username).first()
+
+    if not user or not verify_password(form_data.password, user.hashed_password):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect username or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+
+    # If user is not active
+    if not user.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Inactive user"
+        )
+
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+
+    return {
+        "access_token": create_access_token(
+            user.id, expires_delta=access_token_expires
+        ),
+        "token_type": "bearer",
+    }
+
+
+@router.post("/auth/logout", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def logout(
+    _: User = Depends(get_current_user),
+) -> None:
+    """Logout a user (JWT token should be invalidated client-side)
+    """
+    # JWT is stateless, so nothing to do on server-side for logout
+    # Client should remove the token
+    return None
+
+
+@router.get("/users/me", response_model=UserSchema)
+def read_users_me(
+    current_user: User = Depends(get_current_user),
+) -> Any:
+    """Get current user
+    """
+    return current_user

app/core/auth.py

@@ -0,0 +1,59 @@
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from sqlalchemy.orm import Session
+
+from app.core.config import settings
+from app.core.security import verify_password
+from app.db.session import get_db
+from app.models.user import User
+from app.schemas.token import TokenPayload
+
+oauth2_scheme = OAuth2PasswordBearer(
+    tokenUrl=f"{settings.API_V1_STR}/auth/login"
+)
+
+
+def authenticate_user(db: Session, username: str, password: str) -> User | None:
+    """Authenticate a user by username and password
+    """
+    user = db.query(User).filter(User.username == username).first()
+    if not user:
+        return None
+    if not verify_password(password, user.hashed_password):
+        return None
+    return user
+
+
+def get_current_user(
+    db: Session = Depends(get_db), token: str = Depends(oauth2_scheme)
+) -> User:
+    """Get the current user from the token
+    """
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Invalid authentication credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=["HS256"]
+        )
+        token_data = TokenPayload(**payload)
+
+        if token_data.sub is None:
+            raise credentials_exception
+    except JWTError as e:
+        raise credentials_exception from e
+
+    user = db.query(User).filter(User.id == token_data.sub).first()
+    if user is None:
+        raise credentials_exception
+    if not user.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Inactive user"
+        )
+    return user

app/core/config.py

@@ -0,0 +1,32 @@
+from pathlib import Path
+
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    """Application settings class."""
+
+    API_V1_STR: str = "/api/v1"
+    PROJECT_NAME: str = "Authentication Service"
+
+    # SECURITY
+    SECRET_KEY: str = "your-secret-key-please-change-in-production"
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+
+    # CORS
+    BACKEND_CORS_ORIGINS: list[str] = ["*"]
+
+    # DATABASE
+    DB_DIR: Path = Path("/app") / "storage" / "db"
+    SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
+
+    class Config:
+        """Configuration class for Settings."""
+
+        case_sensitive = True
+
+
+settings = Settings()
+
+# Ensure DB directory exists
+settings.DB_DIR.mkdir(parents=True, exist_ok=True)

app/core/security.py

@@ -0,0 +1,36 @@
+from datetime import datetime, timedelta
+from typing import Any
+
+from jose import jwt
+from passlib.context import CryptContext
+
+from app.core.config import settings
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+
+def create_access_token(subject: str | Any, expires_delta: timedelta | None = None) -> str:
+    """Create a JWT access token
+    """
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(
+            minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
+        )
+
+    to_encode = {"exp": expire, "sub": str(subject)}
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm="HS256")
+    return encoded_jwt
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """Verify a password against a hash
+    """
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    """Hash a password
+    """
+    return pwd_context.hash(password)

app/db/base.py

@@ -0,0 +1,2 @@
+# Import all models here for Alembic to discover
+from app.models.user import User  # noqa

app/db/session.py

@@ -0,0 +1,24 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+from app.core.config import settings
+
+engine = create_engine(
+    settings.SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}  # only needed for SQLite
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
+
+
+def get_db():
+    """Dependency function that yields db sessions
+    """
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

app/middleware/auth.py

@@ -0,0 +1,70 @@
+from collections.abc import Callable
+
+from fastapi import Request, status
+from fastapi.responses import JSONResponse
+from jose import JWTError, jwt
+
+from app.core.config import settings
+
+
+def jwt_middleware(
+    excluded_paths: list[str] | None = None,
+) -> Callable:
+    """Middleware to check for a valid JWT token in protected routes.
+
+    Args:
+        excluded_paths: List of paths to exclude from JWT verification
+
+    Returns:
+        Middleware function
+
+    """
+    async def middleware(request: Request, call_next):
+        # Default excluded paths - public API endpoints and health check
+        if excluded_paths is None:
+            _excluded_paths = [
+                f"{settings.API_V1_STR}/auth/signup",
+                f"{settings.API_V1_STR}/auth/login",
+                "/health",
+                "/docs",
+                "/redoc",
+                "/openapi.json",
+            ]
+        else:
+            _excluded_paths = excluded_paths
+
+        # Skip JWT verification for excluded paths
+        if any(request.url.path.startswith(path) for path in _excluded_paths):
+            return await call_next(request)
+
+        # Get token from Authorization header
+        auth_header = request.headers.get('Authorization')
+        if not auth_header or not auth_header.startswith('Bearer '):
+            return JSONResponse(
+                status_code=status.HTTP_401_UNAUTHORIZED,
+                content={"detail": "Not authenticated"},
+                headers={"WWW-Authenticate": "Bearer"},
+            )
+
+        token = auth_header.split(' ')[1]
+
+        try:
+            # Verify token
+            payload = jwt.decode(
+                token, settings.SECRET_KEY, algorithms=["HS256"]
+            )
+
+            # Attach user_id to request state for future use
+            request.state.user_id = int(payload.get("sub"))
+
+        except JWTError:
+            return JSONResponse(
+                status_code=status.HTTP_401_UNAUTHORIZED,
+                content={"detail": "Invalid authentication credentials"},
+                headers={"WWW-Authenticate": "Bearer"},
+            )
+
+        # Continue processing the request
+        return await call_next(request)
+
+    return middleware

app/models/user.py

@@ -0,0 +1,18 @@
+from sqlalchemy import Boolean, Column, DateTime, Integer, String
+from sqlalchemy.sql import func
+
+from app.db.session import Base
+
+
+class User(Base):
+    """User database model."""
+
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    email = Column(String, unique=True, index=True, nullable=False)
+    username = Column(String, unique=True, index=True, nullable=False)
+    hashed_password = Column(String, nullable=False)
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

app/schemas/token.py

@@ -0,0 +1,15 @@
+
+from pydantic import BaseModel
+
+
+class Token(BaseModel):
+    """Token schema for API responses."""
+
+    access_token: str
+    token_type: str
+
+
+class TokenPayload(BaseModel):
+    """Token payload schema for JWT tokens."""
+
+    sub: int | None = None

app/schemas/user.py

@@ -0,0 +1,55 @@
+from datetime import datetime
+
+from pydantic import BaseModel, EmailStr, Field
+
+
+class UserBase(BaseModel):
+    """Base user schema."""
+
+    email: EmailStr
+    username: str
+    is_active: bool = True
+
+
+class UserCreate(BaseModel):
+    """User schema for creating new users."""
+
+    email: EmailStr
+    username: str
+    password: str = Field(..., min_length=8)
+
+
+class UserUpdate(BaseModel):
+    """User schema for updating users."""
+
+    email: EmailStr | None = None
+    username: str | None = None
+    password: str | None = Field(None, min_length=8)
+    is_active: bool | None = None
+
+
+class UserInDBBase(UserBase):
+    """Base user schema with DB fields."""
+
+    id: int
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        """Configuration for Pydantic model."""
+
+        from_attributes = True
+
+
+class User(UserInDBBase):
+    """User model returned to the client
+    """
+
+    pass
+
+
+class UserInDB(UserInDBBase):
+    """User model with password stored in DB
+    """
+
+    hashed_password: str

init_db.py

@@ -0,0 +1,18 @@
+import os
+import subprocess
+import sys
+
+# Add the current directory to the Python path
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+
+from app.core.config import settings
+
+# Ensure database directory exists
+settings.DB_DIR.mkdir(parents=True, exist_ok=True)
+
+print(f"Initializing database at {settings.SQLALCHEMY_DATABASE_URL}")
+
+# Run Alembic migrations
+subprocess.run(["alembic", "upgrade", "head"], check=True)
+
+print("Database initialization completed.")

main.py

@@ -0,0 +1,54 @@
+from fastapi import Depends, FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from sqlalchemy.orm import Session
+
+from app.api.endpoints import router as api_router
+from app.core.config import settings
+from app.db.session import get_db
+
+# Initialize FastAPI app
+app = FastAPI(
+    title=settings.PROJECT_NAME,
+    openapi_url=f"{settings.API_V1_STR}/openapi.json"
+)
+
+# Set up CORS middleware
+if settings.BACKEND_CORS_ORIGINS:
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=[str(origin) for origin in settings.BACKEND_CORS_ORIGINS],
+        allow_credentials=True,
+        allow_methods=["*"],
+        allow_headers=["*"],
+    )
+
+# Add JWT authentication middleware
+# Note: This middleware is commented out because we're already using FastAPI's
+# dependency injection for authentication. Uncomment if you want to use middleware approach.
+# app.middleware("http")(jwt_middleware())
+
+# Include API router
+app.include_router(api_router, prefix=settings.API_V1_STR)
+
+
+# Health check endpoint
+@app.get("/health", tags=["health"])
+def health_check(db: Session = Depends(get_db)):
+    """Health check endpoint to verify the service is running and database connection is working
+    """
+    # Try to execute a simple query to verify database connection
+    try:
+        db.execute("SELECT 1")
+        db_status = "healthy"
+    except Exception as e:
+        db_status = f"unhealthy: {str(e)}"
+
+    return {
+        "status": "ok",
+        "database": db_status
+    }
+
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(app, host="0.0.0.0", port=8000)

migrations/env.py

@@ -0,0 +1,81 @@
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+from app.db.base import Base
+
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        is_sqlite = connection.dialect.name == 'sqlite'
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            render_as_batch=is_sqlite  # Key configuration for SQLite
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

migrations/script.py.mako

@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

migrations/versions/001_create_users_table.py

@@ -0,0 +1,40 @@
+"""create users table
+
+Revision ID: 001
+Revises: 
+Create Date: 2023-10-15
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '001'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        'users',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('email', sa.String(), nullable=False),
+        sa.Column('username', sa.String(), nullable=False),
+        sa.Column('hashed_password', sa.String(), nullable=False),
+        sa.Column('is_active', sa.Boolean(), default=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('CURRENT_TIMESTAMP')),
+        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('CURRENT_TIMESTAMP'), onupdate=sa.text('CURRENT_TIMESTAMP')),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_users_id'), 'users', ['id'], unique=False)
+    op.create_index(op.f('ix_users_email'), 'users', ['email'], unique=True)
+    op.create_index(op.f('ix_users_username'), 'users', ['username'], unique=True)
+
+
+def downgrade() -> None:
+    op.drop_index(op.f('ix_users_username'), table_name='users')
+    op.drop_index(op.f('ix_users_email'), table_name='users')
+    op.drop_index(op.f('ix_users_id'), table_name='users')
+    op.drop_table('users')

pyproject.toml

@@ -0,0 +1,44 @@
+[tool.ruff]
+line-length = 100
+target-version = "py310"
+
+# Exclude directories and files from linting
+exclude = [
+    ".git",
+    ".github",
+    ".mypy_cache",
+    ".ruff_cache",
+    ".venv",
+    "venv",
+    "__pycache__",
+    "migrations/versions",
+]
+
+[tool.ruff.lint]
+# Enable Pyflakes (`F`) and a subset of the pycodestyle (`E`)
+select = ["E", "F", "I", "W", "N", "D", "UP", "B", "C4", "SIM", "ERA"]
+ignore = [
+    "E501",  # Line length is already enforced by the formatter
+    "D100",  # Missing docstring in public module
+    "D104",  # Missing docstring in public package
+    "D200",  # One-line docstring should fit on one line
+    "D400",  # First line should end with a period
+    "D415",  # First line should end with a period, question mark, or exclamation point
+    "ERA001", # Found commented-out code
+    "E402",  # Module level import not at top of file
+    "B008",  # Do not perform function call in argument defaults
+]
+
+# Allow fix for all enabled rules (when `--fix`) is provided.
+fixable = ["ALL"]
+unfixable = []
+
+# Allow unused variables when underscore-prefixed.
+dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
+
+[tool.ruff.lint.mccabe]
+# Flag any methods with a complexity higher than 10.
+max-complexity = 10
+
+[tool.ruff.lint.isort]
+known-third-party = ["fastapi", "pydantic", "sqlalchemy", "jose", "passlib", "alembic"]

requirements.txt

@@ -0,0 +1,10 @@
+fastapi>=0.100.0
+uvicorn>=0.23.0
+sqlalchemy>=2.0.0
+alembic>=1.11.0
+python-jose[cryptography]>=3.3.0
+passlib[bcrypt]>=1.7.4
+pydantic>=2.0.0
+pydantic-settings>=2.0.0
+python-multipart>=0.0.6
+ruff>=0.1.0