Implement simple ecommerce API with FastAPI and SQLite

- Setup project structure and FastAPI application
- Create SQLAlchemy models for users, products, carts, and orders
- Implement Alembic migrations
- Add CRUD operations and endpoints for all resources
- Setup authentication with JWT
- Add role-based access control
- Update documentation

README.md

@@ -1,3 +1,128 @@
-# FastAPI Application
+# Simple Ecommerce API
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A simple ecommerce API built with FastAPI and SQLite.
+
+## Features
+
+- User authentication (register, login)
+- Product management (CRUD)
+- Shopping cart functionality
+- Order management
+- Role-based access control (admin/regular users)
+
+## Tech Stack
+
+- Python 3.9+
+- FastAPI
+- SQLAlchemy ORM
+- Alembic for database migrations
+- SQLite for database
+- JWT for authentication
+
+## API Endpoints
+
+### Authentication
+
+- `POST /api/v1/auth/register`: Register a new user
+- `POST /api/v1/auth/login`: Login and get access token
+
+### Products
+
+- `GET /api/v1/products`: List all products
+- `GET /api/v1/products/{id}`: Get a specific product
+- `POST /api/v1/products`: Create a new product (admin only)
+- `PUT /api/v1/products/{id}`: Update a product (admin only)
+- `DELETE /api/v1/products/{id}`: Delete a product (admin only)
+
+### Cart
+
+- `GET /api/v1/cart`: Get current user's cart
+- `POST /api/v1/cart/items`: Add an item to cart
+- `PUT /api/v1/cart/items/{id}`: Update cart item quantity
+- `DELETE /api/v1/cart/items/{id}`: Remove an item from cart
+- `DELETE /api/v1/cart`: Clear the cart
+
+### Orders
+
+- `GET /api/v1/orders`: List user's orders (or all orders for admin)
+- `POST /api/v1/orders`: Create a new order from cart
+- `GET /api/v1/orders/{id}`: Get a specific order with details
+- `PUT /api/v1/orders/{id}/status`: Update order status (admin only)
+- `DELETE /api/v1/orders/{id}`: Cancel an order
+
+### Users
+
+- `GET /api/v1/users`: List all users (admin only)
+- `GET /api/v1/users/me`: Get current user details
+- `PUT /api/v1/users/me`: Update current user details
+- `GET /api/v1/users/{id}`: Get a specific user (admin only)
+- `PUT /api/v1/users/{id}`: Update a user (admin only)
+- `DELETE /api/v1/users/{id}`: Delete a user (admin only)
+
+## Project Structure
+
+```
+.
+├── alembic.ini               # Alembic configuration
+├── app/                      # Main application package
+│   ├── api/                  # API endpoints
+│   │   └── v1/               # API version 1
+│   ├── core/                 # Core functionality
+│   ├── crud/                 # Database CRUD operations
+│   ├── db/                   # Database session and models
+│   ├── models/               # SQLAlchemy models
+│   └── schemas/              # Pydantic schemas
+├── main.py                   # Application entry point
+├── migrations/               # Database migrations
+└── requirements.txt          # Project dependencies
+```
+
+## Getting Started
+
+### Prerequisites
+
+- Python 3.9+
+
+### Installation
+
+1. Clone the repository:
+   ```
+   git clone <repository-url>
+   cd simple-ecommerce-api
+   ```
+
+2. Install dependencies:
+   ```
+   pip install -r requirements.txt
+   ```
+
+3. Set up environment variables:
+   ```
+   export SECRET_KEY="your-secret-key"
+   export API_URL="http://localhost:8000"  # Optional, default is http://localhost:8000
+   ```
+
+4. Run database migrations:
+   ```
+   alembic upgrade head
+   ```
+
+5. Start the server:
+   ```
+   uvicorn main:app --reload
+   ```
+
+6. Open your browser and navigate to `http://localhost:8000/docs` to see the interactive API documentation.
+
+## Environment Variables
+
+| Variable | Description | Default |
+|----------|-------------|---------|
+| SECRET_KEY | JWT secret key | "supersecretkey" |
+| API_URL | Base URL for the API | "http://localhost:8000" |
+| FIRST_SUPERUSER_EMAIL | Email for initial superuser | None |
+| FIRST_SUPERUSER_PASSWORD | Password for initial superuser | None |
+
+## License
+
+This project is licensed under the MIT License.

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 example
+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/v1/api.py

@@ -0,0 +1,11 @@
+from fastapi import APIRouter
+
+from app.api.v1 import products, users, cart, orders, auth
+
+api_router = APIRouter()
+
+api_router.include_router(auth.router, prefix="/auth", tags=["auth"])
+api_router.include_router(products.router, prefix="/products", tags=["products"])
+api_router.include_router(users.router, prefix="/users", tags=["users"])
+api_router.include_router(cart.router, prefix="/cart", tags=["cart"])
+api_router.include_router(orders.router, prefix="/orders", tags=["orders"])

app/api/v1/auth.py

@@ -0,0 +1,75 @@
+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.config import settings
+from app.core.security import create_access_token
+from app.crud.user import user as user_crud
+from app.core.deps import get_db
+from app.schemas.token import Token
+from app.schemas.user import User
+
+router = APIRouter()
+
+
+@router.post("/login", response_model=Token)
+def login_access_token(
+    db: Session = Depends(get_db), form_data: OAuth2PasswordRequestForm = Depends()
+) -> Any:
+    """
+    OAuth2 compatible token login, get an access token for future requests.
+    """
+    user = user_crud.authenticate(
+        db, email=form_data.username, password=form_data.password
+    )
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect email or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    elif not user_crud.is_active(user):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN, 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("/register", response_model=User)
+def register_user(
+    *,
+    db: Session = Depends(get_db),
+    email: str,
+    password: str,
+    full_name: str = None,
+) -> Any:
+    """
+    Register a new user.
+    """
+    user = user_crud.get_by_email(db, email=email)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="A user with this email already exists in the system",
+        )
+
+    from app.schemas.user import UserCreate
+
+    user_in = UserCreate(
+        email=email,
+        password=password,
+        full_name=full_name,
+        is_superuser=False,
+        is_active=True,
+    )
+    user = user_crud.create(db, obj_in=user_in)
+    return user

app/api/v1/cart.py

@@ -0,0 +1,147 @@
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.api.v1.deps import get_current_active_user
+from app.core.deps import get_db
+from app.crud.cart import cart_item as cart_item_crud
+from app.crud.product import product as product_crud
+from app.models.user import User
+from app.schemas.cart import (
+    Cart,
+    CartItem,
+    CartItemCreate,
+    CartItemUpdate,
+    CartItemWithProduct,
+)
+from app.schemas.product import Product
+
+router = APIRouter()
+
+
+@router.get("/", response_model=Cart)
+def read_cart(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Retrieve current user's cart.
+    """
+    cart_items = cart_item_crud.get_user_cart(db, user_id=current_user.id)
+
+    # Fetch product details for each cart item
+    items_with_products = []
+    total = 0.0
+
+    for item in cart_items:
+        product = product_crud.get(db, id=item.product_id)
+        if product:
+            item_with_product = CartItemWithProduct.from_orm(item)
+            item_with_product.product = Product.from_orm(product)
+            items_with_products.append(item_with_product)
+            total += product.price * item.quantity
+
+    return {"items": items_with_products, "total": total}
+
+
+@router.post("/items", response_model=CartItem)
+def add_cart_item(
+    *,
+    db: Session = Depends(get_db),
+    item_in: CartItemCreate,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Add item to cart.
+    """
+    # Check if product exists and is in stock
+    product = product_crud.get(db, id=item_in.product_id)
+    if not product:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Product not found",
+        )
+
+    if product.stock < item_in.quantity:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=f"Not enough stock available. Only {product.stock} items left.",
+        )
+
+    # Create or update cart item
+    cart_item = cart_item_crud.create_or_update(
+        db, user_id=current_user.id, obj_in=item_in
+    )
+    return cart_item
+
+
+@router.put("/items/{cart_item_id}", response_model=CartItem)
+def update_cart_item(
+    *,
+    db: Session = Depends(get_db),
+    cart_item_id: int,
+    item_in: CartItemUpdate,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Update quantity of cart item.
+    """
+    cart_item = cart_item_crud.get(db, id=cart_item_id)
+    if not cart_item or cart_item.user_id != current_user.id:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Cart item not found",
+        )
+
+    # Check if product has enough stock
+    product = product_crud.get(db, id=cart_item.product_id)
+    if not product:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Product not found",
+        )
+
+    if product.stock < item_in.quantity:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=f"Not enough stock available. Only {product.stock} items left.",
+        )
+
+    cart_item = cart_item_crud.update(db, db_obj=cart_item, obj_in=item_in)
+    return cart_item
+
+
+@router.delete(
+    "/items/{cart_item_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None
+)
+def remove_cart_item(
+    *,
+    db: Session = Depends(get_db),
+    cart_item_id: int,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Remove item from cart.
+    """
+    cart_item = cart_item_crud.get(db, id=cart_item_id)
+    if not cart_item or cart_item.user_id != current_user.id:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Cart item not found",
+        )
+
+    cart_item_crud.remove(db, id=cart_item_id)
+    return None
+
+
+@router.delete("/", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def clear_cart(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Clear all items from cart.
+    """
+    cart_item_crud.clear_cart(db, user_id=current_user.id)
+    return None

app/api/v1/deps.py

@@ -0,0 +1 @@
+# Re-export dependencies from core.deps

app/api/v1/orders.py

@@ -0,0 +1,224 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.api.v1.deps import get_current_active_superuser, get_current_active_user
+from app.core.deps import get_db
+from app.crud.cart import cart_item as cart_item_crud
+from app.crud.order import order as order_crud, order_item as order_item_crud
+from app.crud.product import product as product_crud
+from app.models.order import OrderStatus
+from app.models.user import User
+from app.schemas.order import Order, OrderCreate, OrderWithItems, OrderItemCreate
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[Order])
+def read_orders(
+    db: Session = Depends(get_db),
+    skip: int = 0,
+    limit: int = 100,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Retrieve orders.
+
+    If user is superuser, returns all orders with pagination.
+    Otherwise, returns only the current user's orders.
+    """
+    if current_user.is_superuser:
+        orders = order_crud.get_multi(db, skip=skip, limit=limit)
+    else:
+        orders = order_crud.get_user_orders(db, user_id=current_user.id)
+    return orders
+
+
+@router.post("/", response_model=Order)
+def create_order(
+    *,
+    db: Session = Depends(get_db),
+    order_in: OrderCreate,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Create new order from user's cart.
+    """
+    # Get user's cart
+    cart_items = cart_item_crud.get_user_cart(db, user_id=current_user.id)
+    if not cart_items:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Cannot create order with empty cart",
+        )
+
+    # Check stock and prepare order items
+    order_items = []
+    total_amount = 0.0
+
+    for cart_item in cart_items:
+        product = product_crud.get(db, id=cart_item.product_id)
+        if not product:
+            raise HTTPException(
+                status_code=status.HTTP_404_NOT_FOUND,
+                detail=f"Product with ID {cart_item.product_id} not found",
+            )
+
+        if product.stock < cart_item.quantity:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail=f"Not enough stock for product '{product.name}'. Only {product.stock} available.",
+            )
+
+        # Create order item
+        order_item = OrderItemCreate(
+            product_id=cart_item.product_id,
+            quantity=cart_item.quantity,
+        )
+        order_item.unit_price = (
+            product.price
+        )  # Add unit price from current product price
+        order_items.append(order_item)
+
+        # Update total amount
+        total_amount += product.price * cart_item.quantity
+
+        # Update product stock
+        product_crud.update_stock(
+            db, product_id=product.id, quantity=-cart_item.quantity
+        )
+
+    # Create order
+    order = order_crud.create_with_items(
+        db,
+        obj_in=order_in,
+        user_id=current_user.id,
+        items=order_items,
+        total_amount=total_amount,
+    )
+
+    # Clear cart
+    cart_item_crud.clear_cart(db, user_id=current_user.id)
+
+    return order
+
+
+@router.get("/{order_id}", response_model=OrderWithItems)
+def read_order(
+    *,
+    db: Session = Depends(get_db),
+    order_id: int,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Get order by ID with its items.
+    """
+    order = order_crud.get(db, id=order_id)
+    if not order:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Order not found",
+        )
+
+    # Check if user has permission to access this order
+    if not current_user.is_superuser and order.user_id != current_user.id:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions to access this order",
+        )
+
+    # Get order items
+    order_items = order_item_crud.get_by_order(db, order_id=order.id)
+
+    # Fetch product details for each order item
+    items_with_products = []
+    for item in order_items:
+        product = product_crud.get(db, id=item.product_id)
+        if product:
+            from app.schemas.order import OrderItemWithProduct
+
+            item_with_product = OrderItemWithProduct.from_orm(item)
+            item_with_product.product = product
+            items_with_products.append(item_with_product)
+
+    # Create response
+    from app.schemas.order import OrderWithItems
+
+    order_with_items = OrderWithItems.from_orm(order)
+    order_with_items.items = items_with_products
+
+    return order_with_items
+
+
+@router.put("/{order_id}/status", response_model=Order)
+def update_order_status(
+    *,
+    db: Session = Depends(get_db),
+    order_id: int,
+    status: OrderStatus,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Update order status.
+
+    Only superusers can update order status.
+    """
+    order = order_crud.get(db, id=order_id)
+    if not order:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Order not found",
+        )
+
+    order = order_crud.update_status(db, order_id=order_id, status=status)
+    return order
+
+
+@router.delete(
+    "/{order_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None
+)
+def cancel_order(
+    *,
+    db: Session = Depends(get_db),
+    order_id: int,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Cancel an order.
+
+    Superusers can cancel any order.
+    Regular users can only cancel their own orders and only if the order is still pending.
+    """
+    order = order_crud.get(db, id=order_id)
+    if not order:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Order not found",
+        )
+
+    # Check permissions
+    if not current_user.is_superuser and order.user_id != current_user.id:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions to cancel this order",
+        )
+
+    # Regular users can only cancel pending orders
+    if not current_user.is_superuser and order.status != OrderStatus.PENDING:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Cannot cancel order that is not in 'pending' status",
+        )
+
+    # Update order status to cancelled
+    order_crud.update_status(db, order_id=order_id, status=OrderStatus.CANCELLED)
+
+    # Return stock to inventory
+    order_items = order_item_crud.get_by_order(db, order_id=order.id)
+    for item in order_items:
+        product_crud.update_stock(
+            db, product_id=item.product_id, quantity=item.quantity
+        )
+
+    return None

app/api/v1/products.py

@@ -0,0 +1,119 @@
+from typing import Any, List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.api.v1.deps import get_current_active_superuser
+from app.core.deps import get_db
+from app.crud.product import product as product_crud
+from app.models.user import User
+from app.schemas.product import Product, ProductCreate, ProductUpdate
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[Product])
+def read_products(
+    db: Session = Depends(get_db),
+    skip: int = 0,
+    limit: int = 100,
+    search: Optional[str] = None,
+) -> Any:
+    """
+    Retrieve products.
+
+    If search query is provided, returns products matching the search query.
+    Otherwise, returns all products with pagination.
+    """
+    if search:
+        products = product_crud.search_products(
+            db, query=search, skip=skip, limit=limit
+        )
+    else:
+        products = product_crud.get_multi(db, skip=skip, limit=limit)
+    return products
+
+
+@router.post("/", response_model=Product)
+def create_product(
+    *,
+    db: Session = Depends(get_db),
+    product_in: ProductCreate,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Create new product.
+
+    Only superusers can create products.
+    """
+    product = product_crud.get_product_by_name(db, name=product_in.name)
+    if product:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="A product with this name already exists",
+        )
+    product = product_crud.create(db, obj_in=product_in)
+    return product
+
+
+@router.get("/{id}", response_model=Product)
+def read_product(
+    *,
+    db: Session = Depends(get_db),
+    id: int,
+) -> Any:
+    """
+    Get product by ID.
+    """
+    product = product_crud.get(db, id=id)
+    if not product:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Product not found",
+        )
+    return product
+
+
+@router.put("/{id}", response_model=Product)
+def update_product(
+    *,
+    db: Session = Depends(get_db),
+    id: int,
+    product_in: ProductUpdate,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Update a product.
+
+    Only superusers can update products.
+    """
+    product = product_crud.get(db, id=id)
+    if not product:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Product not found",
+        )
+    product = product_crud.update(db, db_obj=product, obj_in=product_in)
+    return product
+
+
+@router.delete("/{id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def delete_product(
+    *,
+    db: Session = Depends(get_db),
+    id: int,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Delete a product.
+
+    Only superusers can delete products.
+    """
+    product = product_crud.get(db, id=id)
+    if not product:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Product not found",
+        )
+    product_crud.remove(db, id=id)
+    return None

app/api/v1/users.py

@@ -0,0 +1,148 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Body, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.api.v1.deps import get_current_active_superuser, get_current_active_user
+from app.core.deps import get_db
+from app.crud.user import user as user_crud
+from app.models.user import User
+from app.schemas.user import User as UserSchema
+from app.schemas.user import UserCreate, UserUpdate
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[UserSchema])
+def read_users(
+    db: Session = Depends(get_db),
+    skip: int = 0,
+    limit: int = 100,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Retrieve users.
+
+    Only superusers can access this endpoint.
+    """
+    users = user_crud.get_multi(db, skip=skip, limit=limit)
+    return users
+
+
+@router.post("/", response_model=UserSchema)
+def create_user(
+    *,
+    db: Session = Depends(get_db),
+    user_in: UserCreate,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Create new user.
+
+    Only superusers can create other users.
+    """
+    user = user_crud.get_by_email(db, email=user_in.email)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="A user with this email already exists in the system",
+        )
+    user = user_crud.create(db, obj_in=user_in)
+    return user
+
+
+@router.get("/me", response_model=UserSchema)
+def read_user_me(
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Get current user.
+    """
+    return current_user
+
+
+@router.put("/me", response_model=UserSchema)
+def update_user_me(
+    *,
+    db: Session = Depends(get_db),
+    full_name: str = Body(None),
+    password: str = Body(None),
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Update own user.
+    """
+    user_in = UserUpdate()
+    if password is not None:
+        user_in.password = password
+    if full_name is not None:
+        user_in.full_name = full_name
+    user = user_crud.update(db, db_obj=current_user, obj_in=user_in)
+    return user
+
+
+@router.get("/{user_id}", response_model=UserSchema)
+def read_user_by_id(
+    user_id: int,
+    current_user: User = Depends(get_current_active_user),
+    db: Session = Depends(get_db),
+) -> Any:
+    """
+    Get a specific user by id.
+    """
+    user = user_crud.get(db, id=user_id)
+    if user == current_user:
+        return user
+    if not user_crud.is_superuser(current_user):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="The user doesn't have enough privileges",
+        )
+    return user
+
+
+@router.put("/{user_id}", response_model=UserSchema)
+def update_user(
+    *,
+    db: Session = Depends(get_db),
+    user_id: int,
+    user_in: UserUpdate,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Update a user.
+
+    Only superusers can update other users.
+    """
+    user = user_crud.get(db, id=user_id)
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="The user with this ID does not exist in the system",
+        )
+    user = user_crud.update(db, db_obj=user, obj_in=user_in)
+    return user
+
+
+@router.delete(
+    "/{user_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None
+)
+def delete_user(
+    *,
+    db: Session = Depends(get_db),
+    user_id: int,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Delete a user.
+
+    Only superusers can delete users.
+    """
+    user = user_crud.get(db, id=user_id)
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="The user with this ID does not exist in the system",
+        )
+    user_crud.remove(db, id=user_id)
+    return None

app/core/config.py

@@ -0,0 +1,35 @@
+import os
+from pathlib import Path
+from typing import Optional
+
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    API_V1_STR: str = "/api/v1"
+    PROJECT_NAME: str = "Simple Ecommerce API"
+    PROJECT_DESCRIPTION: str = "A simple ecommerce API built with FastAPI and SQLite"
+    VERSION: str = "0.1.0"
+
+    # Base API URL (without trailing slash)
+    API_URL: str = os.getenv("API_URL", "http://localhost:8000")
+
+    # JWT Secret key
+    SECRET_KEY: str = os.getenv("SECRET_KEY", "supersecretkey")
+    # 60 minutes * 24 hours * 8 days = 8 days
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 8
+
+    # Database
+    DB_DIR = Path("/app") / "storage" / "db"
+    DB_DIR.mkdir(parents=True, exist_ok=True)
+    SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
+
+    # First superuser
+    FIRST_SUPERUSER_EMAIL: Optional[str] = os.getenv("FIRST_SUPERUSER_EMAIL")
+    FIRST_SUPERUSER_PASSWORD: Optional[str] = os.getenv("FIRST_SUPERUSER_PASSWORD")
+
+    class Config:
+        case_sensitive = True
+
+
+settings = Settings()

app/core/deps.py

@@ -0,0 +1,106 @@
+from typing import Generator
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from pydantic import ValidationError
+from sqlalchemy.orm import Session
+
+from app.core.config import settings
+from app.crud.user import user as user_crud
+from app.db.session import SessionLocal
+from app.models.user import User
+from app.schemas.token import TokenPayload
+
+reusable_oauth2 = OAuth2PasswordBearer(tokenUrl=f"{settings.API_V1_STR}/auth/login")
+
+
+def get_db() -> Generator:
+    """
+    Dependency function that yields a SQLAlchemy database session.
+
+    The session is closed after the request is complete.
+    """
+    try:
+        db = SessionLocal()
+        yield db
+    finally:
+        db.close()
+
+
+def get_current_user(
+    db: Session = Depends(get_db), token: str = Depends(reusable_oauth2)
+) -> User:
+    """
+    Decode JWT token to get user identity and fetch user object from database.
+
+    Args:
+        db: Database session
+        token: JWT token
+
+    Returns:
+        User object
+
+    Raises:
+        HTTPException: If token is invalid or user not found
+    """
+    try:
+        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=["HS256"])
+        token_data = TokenPayload(**payload)
+    except (JWTError, ValidationError):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Could not validate credentials",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    user = user_crud.get(db, id=token_data.sub)
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND, detail="User not found"
+        )
+    return user
+
+
+def get_current_active_user(
+    current_user: User = Depends(get_current_user),
+) -> User:
+    """
+    Check if current user is active.
+
+    Args:
+        current_user: Current user
+
+    Returns:
+        User object
+
+    Raises:
+        HTTPException: If user is inactive
+    """
+    if not user_crud.is_active(current_user):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN, detail="Inactive user"
+        )
+    return current_user
+
+
+def get_current_active_superuser(
+    current_user: User = Depends(get_current_user),
+) -> User:
+    """
+    Check if current user is a superuser.
+
+    Args:
+        current_user: Current user
+
+    Returns:
+        User object
+
+    Raises:
+        HTTPException: If user is not a superuser
+    """
+    if not user_crud.is_superuser(current_user):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="The user doesn't have enough privileges",
+        )
+    return current_user

app/core/security.py

@@ -0,0 +1,60 @@
+from datetime import datetime, timedelta
+from typing import Any, Union
+
+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: Union[str, Any], expires_delta: timedelta = None
+) -> str:
+    """
+    Create a new access token for a user.
+
+    Args:
+        subject: The subject of the token (typically the user ID)
+        expires_delta: Optional expiration time for the token
+
+    Returns:
+        The encoded JWT 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 that a plain password matches a hashed password.
+
+    Args:
+        plain_password: The plain text password to check
+        hashed_password: The hashed password to compare against
+
+    Returns:
+        True if the passwords match, False otherwise
+    """
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    """
+    Hash a password using the configured password context.
+
+    Args:
+        password: The plain text password to hash
+
+    Returns:
+        The hashed password
+    """
+    return pwd_context.hash(password)

app/crud/__init__.py

@@ -0,0 +1 @@
+# Empty init file to make the directory a proper Python package

app/crud/base.py

@@ -0,0 +1,116 @@
+from typing import Any, Dict, Generic, List, Optional, Type, TypeVar, Union
+
+from fastapi.encoders import jsonable_encoder
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+
+from app.db.base import Base
+
+ModelType = TypeVar("ModelType", bound=Base)
+CreateSchemaType = TypeVar("CreateSchemaType", bound=BaseModel)
+UpdateSchemaType = TypeVar("UpdateSchemaType", bound=BaseModel)
+
+
+class CRUDBase(Generic[ModelType, CreateSchemaType, UpdateSchemaType]):
+    def __init__(self, model: Type[ModelType]):
+        """
+        CRUD object with default methods to Create, Read, Update, Delete (CRUD).
+
+        Args:
+            model: A SQLAlchemy model class
+        """
+        self.model = model
+
+    def get(self, db: Session, id: Any) -> Optional[ModelType]:
+        """
+        Get a single record by ID.
+
+        Args:
+            db: Database session
+            id: Record ID
+
+        Returns:
+            The model instance or None if not found
+        """
+        return db.query(self.model).filter(self.model.id == id).first()
+
+    def get_multi(
+        self, db: Session, *, skip: int = 0, limit: int = 100
+    ) -> List[ModelType]:
+        """
+        Get multiple records with pagination.
+
+        Args:
+            db: Database session
+            skip: Number of records to skip
+            limit: Maximum number of records to return
+
+        Returns:
+            List of model instances
+        """
+        return db.query(self.model).offset(skip).limit(limit).all()
+
+    def create(self, db: Session, *, obj_in: CreateSchemaType) -> ModelType:
+        """
+        Create a new record.
+
+        Args:
+            db: Database session
+            obj_in: Schema containing data for the new record
+
+        Returns:
+            The created model instance
+        """
+        obj_in_data = jsonable_encoder(obj_in)
+        db_obj = self.model(**obj_in_data)
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def update(
+        self,
+        db: Session,
+        *,
+        db_obj: ModelType,
+        obj_in: Union[UpdateSchemaType, Dict[str, Any]],
+    ) -> ModelType:
+        """
+        Update a record.
+
+        Args:
+            db: Database session
+            db_obj: Model instance to update
+            obj_in: New data as schema or dict
+
+        Returns:
+            The updated model instance
+        """
+        obj_data = jsonable_encoder(db_obj)
+        if isinstance(obj_in, dict):
+            update_data = obj_in
+        else:
+            update_data = obj_in.dict(exclude_unset=True)
+        for field in obj_data:
+            if field in update_data:
+                setattr(db_obj, field, update_data[field])
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def remove(self, db: Session, *, id: int) -> ModelType:
+        """
+        Delete a record.
+
+        Args:
+            db: Database session
+            id: Record ID
+
+        Returns:
+            The deleted model instance
+        """
+        obj = db.query(self.model).get(id)
+        db.delete(obj)
+        db.commit()
+        return obj

app/crud/cart.py

@@ -0,0 +1,91 @@
+from typing import List, Optional
+
+from sqlalchemy.orm import Session
+
+from app.crud.base import CRUDBase
+from app.models.cart import CartItem
+from app.schemas.cart import CartItemCreate, CartItemUpdate
+
+
+class CRUDCartItem(CRUDBase[CartItem, CartItemCreate, CartItemUpdate]):
+    def get_by_user_and_product(
+        self, db: Session, *, user_id: int, product_id: int
+    ) -> Optional[CartItem]:
+        """
+        Get a cart item by user ID and product ID.
+
+        Args:
+            db: Database session
+            user_id: User ID
+            product_id: Product ID
+
+        Returns:
+            The cart item or None if not found
+        """
+        return (
+            db.query(self.model)
+            .filter(self.model.user_id == user_id, self.model.product_id == product_id)
+            .first()
+        )
+
+    def get_user_cart(self, db: Session, *, user_id: int) -> List[CartItem]:
+        """
+        Get all cart items for a user.
+
+        Args:
+            db: Database session
+            user_id: User ID
+
+        Returns:
+            List of cart items
+        """
+        return db.query(self.model).filter(self.model.user_id == user_id).all()
+
+    def create_or_update(
+        self, db: Session, *, user_id: int, obj_in: CartItemCreate
+    ) -> CartItem:
+        """
+        Create a new cart item or update the quantity if it already exists.
+
+        Args:
+            db: Database session
+            user_id: User ID
+            obj_in: Cart item data
+
+        Returns:
+            The created or updated cart item
+        """
+        cart_item = self.get_by_user_and_product(
+            db, user_id=user_id, product_id=obj_in.product_id
+        )
+
+        if cart_item:
+            # Update existing cart item
+            cart_item.quantity += obj_in.quantity
+            db.add(cart_item)
+            db.commit()
+            db.refresh(cart_item)
+            return cart_item
+        else:
+            # Create new cart item
+            db_obj = CartItem(
+                user_id=user_id, product_id=obj_in.product_id, quantity=obj_in.quantity
+            )
+            db.add(db_obj)
+            db.commit()
+            db.refresh(db_obj)
+            return db_obj
+
+    def clear_cart(self, db: Session, *, user_id: int) -> None:
+        """
+        Remove all cart items for a user.
+
+        Args:
+            db: Database session
+            user_id: User ID
+        """
+        db.query(self.model).filter(self.model.user_id == user_id).delete()
+        db.commit()
+
+
+cart_item = CRUDCartItem(CartItem)

app/crud/order.py

@@ -0,0 +1,113 @@
+from typing import List, Optional
+
+from sqlalchemy.orm import Session
+
+from app.crud.base import CRUDBase
+from app.models.order import Order, OrderItem, OrderStatus
+from app.schemas.order import OrderCreate, OrderUpdate, OrderItemCreate
+
+
+class CRUDOrder(CRUDBase[Order, OrderCreate, OrderUpdate]):
+    def get_user_orders(self, db: Session, *, user_id: int) -> List[Order]:
+        """
+        Get all orders for a user.
+
+        Args:
+            db: Database session
+            user_id: User ID
+
+        Returns:
+            List of orders
+        """
+        return db.query(self.model).filter(self.model.user_id == user_id).all()
+
+    def create_with_items(
+        self,
+        db: Session,
+        *,
+        obj_in: OrderCreate,
+        user_id: int,
+        items: List[OrderItemCreate],
+        total_amount: float,
+    ) -> Order:
+        """
+        Create a new order with order items.
+
+        Args:
+            db: Database session
+            obj_in: Order data
+            user_id: User ID
+            items: List of order items
+            total_amount: Total order amount
+
+        Returns:
+            The created order with items
+        """
+        # Create order
+        order_data = obj_in.dict()
+        db_obj = Order(
+            **order_data,
+            user_id=user_id,
+            total_amount=total_amount,
+            status=OrderStatus.PENDING,
+        )
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+
+        # Create order items
+        for item in items:
+            order_item = OrderItem(
+                order_id=db_obj.id,
+                product_id=item.product_id,
+                quantity=item.quantity,
+                unit_price=item.unit_price if hasattr(item, "unit_price") else 0,
+            )
+            db.add(order_item)
+
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def update_status(
+        self, db: Session, *, order_id: int, status: OrderStatus
+    ) -> Optional[Order]:
+        """
+        Update the status of an order.
+
+        Args:
+            db: Database session
+            order_id: Order ID
+            status: New order status
+
+        Returns:
+            The updated order or None if not found
+        """
+        order = self.get(db, id=order_id)
+        if not order:
+            return None
+
+        order.status = status
+        db.add(order)
+        db.commit()
+        db.refresh(order)
+        return order
+
+
+class CRUDOrderItem(CRUDBase[OrderItem, OrderItemCreate, OrderItemCreate]):
+    def get_by_order(self, db: Session, *, order_id: int) -> List[OrderItem]:
+        """
+        Get all items for an order.
+
+        Args:
+            db: Database session
+            order_id: Order ID
+
+        Returns:
+            List of order items
+        """
+        return db.query(self.model).filter(self.model.order_id == order_id).all()
+
+
+order = CRUDOrder(Order)
+order_item = CRUDOrderItem(OrderItem)

app/crud/product.py

@@ -0,0 +1,71 @@
+from typing import List, Optional
+
+from sqlalchemy.orm import Session
+
+from app.crud.base import CRUDBase
+from app.models.product import Product
+from app.schemas.product import ProductCreate, ProductUpdate
+
+
+class CRUDProduct(CRUDBase[Product, ProductCreate, ProductUpdate]):
+    def search_products(
+        self, db: Session, *, query: str, skip: int = 0, limit: int = 100
+    ) -> List[Product]:
+        """
+        Search for products by name or description.
+
+        Args:
+            db: Database session
+            query: Search query
+            skip: Number of records to skip
+            limit: Maximum number of records to return
+
+        Returns:
+            List of products matching the search query
+        """
+        search_pattern = f"%{query}%"
+        return (
+            db.query(self.model)
+            .filter(
+                (self.model.name.ilike(search_pattern))
+                | (self.model.description.ilike(search_pattern))
+            )
+            .offset(skip)
+            .limit(limit)
+            .all()
+        )
+
+    def get_product_by_name(self, db: Session, *, name: str) -> Optional[Product]:
+        """
+        Get a product by its exact name.
+
+        Args:
+            db: Database session
+            name: Product name
+
+        Returns:
+            The product or None if not found
+        """
+        return db.query(self.model).filter(self.model.name == name).first()
+
+    def update_stock(self, db: Session, *, product_id: int, quantity: int) -> Product:
+        """
+        Update product stock quantity.
+
+        Args:
+            db: Database session
+            product_id: Product ID
+            quantity: Quantity to add (positive) or subtract (negative)
+
+        Returns:
+            The updated product
+        """
+        product = self.get(db, id=product_id)
+        if product:
+            product.stock += quantity
+            db.commit()
+            db.refresh(product)
+        return product
+
+
+product = CRUDProduct(Product)

app/crud/user.py

@@ -0,0 +1,116 @@
+from typing import Any, Dict, Optional, Union
+
+from sqlalchemy.orm import Session
+
+from app.core.security import get_password_hash, verify_password
+from app.crud.base import CRUDBase
+from app.models.user import User
+from app.schemas.user import UserCreate, UserUpdate
+
+
+class CRUDUser(CRUDBase[User, UserCreate, UserUpdate]):
+    def get_by_email(self, db: Session, *, email: str) -> Optional[User]:
+        """
+        Get a user by email.
+
+        Args:
+            db: Database session
+            email: User email
+
+        Returns:
+            The user or None if not found
+        """
+        return db.query(User).filter(User.email == email).first()
+
+    def create(self, db: Session, *, obj_in: UserCreate) -> User:
+        """
+        Create a new user.
+
+        Args:
+            db: Database session
+            obj_in: User data including password
+
+        Returns:
+            The created user
+        """
+        db_obj = User(
+            email=obj_in.email,
+            hashed_password=get_password_hash(obj_in.password),
+            full_name=obj_in.full_name,
+            is_superuser=obj_in.is_superuser,
+            is_active=obj_in.is_active,
+        )
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def update(
+        self, db: Session, *, db_obj: User, obj_in: Union[UserUpdate, Dict[str, Any]]
+    ) -> User:
+        """
+        Update a user.
+
+        Args:
+            db: Database session
+            db_obj: User instance to update
+            obj_in: New user data
+
+        Returns:
+            The updated user
+        """
+        if isinstance(obj_in, dict):
+            update_data = obj_in
+        else:
+            update_data = obj_in.dict(exclude_unset=True)
+        if "password" in update_data and update_data["password"]:
+            hashed_password = get_password_hash(update_data["password"])
+            del update_data["password"]
+            update_data["hashed_password"] = hashed_password
+        return super().update(db, db_obj=db_obj, obj_in=update_data)
+
+    def authenticate(self, db: Session, *, email: str, password: str) -> Optional[User]:
+        """
+        Authenticate a user.
+
+        Args:
+            db: Database session
+            email: User email
+            password: User password
+
+        Returns:
+            The authenticated user or None if authentication fails
+        """
+        user = self.get_by_email(db, email=email)
+        if not user:
+            return None
+        if not verify_password(password, user.hashed_password):
+            return None
+        return user
+
+    def is_active(self, user: User) -> bool:
+        """
+        Check if a user is active.
+
+        Args:
+            user: User instance
+
+        Returns:
+            True if the user is active, False otherwise
+        """
+        return user.is_active
+
+    def is_superuser(self, user: User) -> bool:
+        """
+        Check if a user is a superuser.
+
+        Args:
+            user: User instance
+
+        Returns:
+            True if the user is a superuser, False otherwise
+        """
+        return user.is_superuser
+
+
+user = CRUDUser(User)

app/db/__init__.py

@@ -0,0 +1 @@
+# Empty init file to make the directory a proper Python package

app/db/base.py

@@ -0,0 +1,3 @@
+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()

app/db/base_class.py

@@ -0,0 +1,2 @@
+# Import all the models, so that Base has them before being
+# imported by Alembic

app/db/session.py

@@ -0,0 +1,23 @@
+from sqlalchemy import create_engine
+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)
+
+
+def get_db():
+    """
+    Dependency function that yields a SQLAlchemy database session.
+
+    The session is closed after the request is complete.
+    """
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

app/models/__init__.py

@@ -0,0 +1,5 @@
+# Import models for easier access
+from app.models.user import User  # noqa: F401
+from app.models.product import Product  # noqa: F401
+from app.models.order import Order, OrderItem, OrderStatus  # noqa: F401
+from app.models.cart import CartItem  # noqa: F401

app/models/cart.py

@@ -0,0 +1,20 @@
+from datetime import datetime
+from sqlalchemy import Column, DateTime, ForeignKey, Integer
+from sqlalchemy.orm import relationship
+
+from app.db.base import Base
+
+
+class CartItem(Base):
+    __tablename__ = "cart_items"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    product_id = Column(Integer, ForeignKey("products.id"), nullable=False)
+    quantity = Column(Integer, nullable=False, default=1)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    # Relationships
+    user = relationship("User", back_populates="cart_items")
+    product = relationship("Product", back_populates="cart_items")

app/models/order.py

@@ -0,0 +1,47 @@
+from datetime import datetime
+from enum import Enum as PyEnum
+from sqlalchemy import Column, DateTime, Enum, Float, ForeignKey, Integer, String
+from sqlalchemy.orm import relationship
+
+from app.db.base import Base
+
+
+class OrderStatus(str, PyEnum):
+    PENDING = "pending"
+    PAID = "paid"
+    SHIPPED = "shipped"
+    DELIVERED = "delivered"
+    CANCELLED = "cancelled"
+
+
+class Order(Base):
+    __tablename__ = "orders"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    status = Column(Enum(OrderStatus), default=OrderStatus.PENDING, nullable=False)
+    total_amount = Column(Float, nullable=False)
+    shipping_address = Column(String, nullable=False)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    # Relationships
+    user = relationship("User", back_populates="orders")
+    items = relationship(
+        "OrderItem", back_populates="order", cascade="all, delete-orphan"
+    )
+
+
+class OrderItem(Base):
+    __tablename__ = "order_items"
+
+    id = Column(Integer, primary_key=True, index=True)
+    order_id = Column(Integer, ForeignKey("orders.id"), nullable=False)
+    product_id = Column(Integer, ForeignKey("products.id"), nullable=False)
+    quantity = Column(Integer, nullable=False)
+    unit_price = Column(Float, nullable=False)
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+    # Relationships
+    order = relationship("Order", back_populates="items")
+    product = relationship("Product", back_populates="order_items")

app/models/product.py

@@ -0,0 +1,22 @@
+from datetime import datetime
+from sqlalchemy import Column, DateTime, Float, Integer, String, Text
+from sqlalchemy.orm import relationship
+
+from app.db.base import Base
+
+
+class Product(Base):
+    __tablename__ = "products"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, index=True, nullable=False)
+    description = Column(Text, nullable=True)
+    price = Column(Float, nullable=False)
+    stock = Column(Integer, default=0, nullable=False)
+    image_url = Column(String, nullable=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    # Relationships
+    order_items = relationship("OrderItem", back_populates="product")
+    cart_items = relationship("CartItem", back_populates="product")

app/models/user.py

@@ -0,0 +1,22 @@
+from datetime import datetime
+from sqlalchemy import Boolean, Column, DateTime, Integer, String
+from sqlalchemy.orm import relationship
+
+from app.db.base import Base
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    email = Column(String, unique=True, index=True, nullable=False)
+    hashed_password = Column(String, nullable=False)
+    full_name = Column(String, index=True)
+    is_active = Column(Boolean, default=True)
+    is_superuser = Column(Boolean, default=False)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    # Relationships
+    orders = relationship("Order", back_populates="user")
+    cart_items = relationship("CartItem", back_populates="user")

app/schemas/__init__.py

@@ -0,0 +1 @@
+# Empty init file to make the directory a proper Python package

app/schemas/cart.py

@@ -0,0 +1,51 @@
+from datetime import datetime
+from typing import List
+
+from pydantic import BaseModel, Field
+
+from app.schemas.product import Product
+
+
+# Shared properties
+class CartItemBase(BaseModel):
+    product_id: int
+    quantity: int = Field(..., gt=0)
+
+
+# Properties to receive on cart item creation
+class CartItemCreate(CartItemBase):
+    pass
+
+
+# Properties to receive on cart item update
+class CartItemUpdate(BaseModel):
+    quantity: int = Field(..., gt=0)
+
+
+class CartItemInDBBase(CartItemBase):
+    id: int
+    user_id: int
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+# Additional properties to return via API
+class CartItem(CartItemInDBBase):
+    pass
+
+
+# Additional properties stored in DB
+class CartItemInDB(CartItemInDBBase):
+    pass
+
+
+class CartItemWithProduct(CartItem):
+    product: Product
+
+
+class Cart(BaseModel):
+    items: List[CartItemWithProduct]
+    total: float

app/schemas/order.py

@@ -0,0 +1,79 @@
+from datetime import datetime
+from typing import List, Optional
+
+from pydantic import BaseModel, Field
+
+from app.models.order import OrderStatus
+from app.schemas.product import Product
+
+
+# Shared properties
+class OrderItemBase(BaseModel):
+    product_id: int
+    quantity: int = Field(..., gt=0)
+
+
+# Properties to receive on order item creation
+class OrderItemCreate(OrderItemBase):
+    pass
+
+
+# Additional properties stored in DB for order item
+class OrderItemInDBBase(OrderItemBase):
+    id: int
+    order_id: int
+    unit_price: float
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+# Additional properties to return via API
+class OrderItem(OrderItemInDBBase):
+    pass
+
+
+class OrderItemWithProduct(OrderItem):
+    product: Product
+
+
+# Shared properties for order
+class OrderBase(BaseModel):
+    shipping_address: Optional[str] = None
+
+
+# Properties to receive on order creation
+class OrderCreate(OrderBase):
+    shipping_address: str
+
+
+# Properties to receive on order update
+class OrderUpdate(BaseModel):
+    status: OrderStatus
+
+
+class OrderInDBBase(OrderBase):
+    id: int
+    user_id: int
+    status: OrderStatus
+    total_amount: float
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+# Additional properties to return via API
+class Order(OrderInDBBase):
+    pass
+
+
+# Additional properties stored in DB
+class OrderInDB(OrderInDBBase):
+    pass
+
+
+class OrderWithItems(Order):
+    items: List[OrderItemWithProduct]

app/schemas/product.py

@@ -0,0 +1,44 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, Field
+
+
+# Shared properties
+class ProductBase(BaseModel):
+    name: Optional[str] = None
+    description: Optional[str] = None
+    price: Optional[float] = None
+    stock: Optional[int] = None
+    image_url: Optional[str] = None
+
+
+# Properties to receive on product creation
+class ProductCreate(ProductBase):
+    name: str
+    price: float = Field(..., gt=0)
+    stock: int = Field(..., ge=0)
+
+
+# Properties to receive on product update
+class ProductUpdate(ProductBase):
+    pass
+
+
+class ProductInDBBase(ProductBase):
+    id: int
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+# Additional properties to return via API
+class Product(ProductInDBBase):
+    pass
+
+
+# Additional properties stored in DB
+class ProductInDB(ProductInDBBase):
+    pass

app/schemas/token.py

@@ -0,0 +1,13 @@
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+
+class TokenPayload(BaseModel):
+    sub: Optional[int] = None
+    is_superuser: bool = False

app/schemas/user.py

@@ -0,0 +1,42 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, EmailStr
+
+
+# Shared properties
+class UserBase(BaseModel):
+    email: Optional[EmailStr] = None
+    is_active: Optional[bool] = True
+    is_superuser: bool = False
+    full_name: Optional[str] = None
+
+
+# Properties to receive via API on creation
+class UserCreate(UserBase):
+    email: EmailStr
+    password: str
+
+
+# Properties to receive via API on update
+class UserUpdate(UserBase):
+    password: Optional[str] = None
+
+
+class UserInDBBase(UserBase):
+    id: Optional[int] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+# Additional properties to return via API
+class User(UserInDBBase):
+    pass
+
+
+# Additional properties stored in DB
+class UserInDB(UserInDBBase):
+    hashed_password: str

main.py

@@ -0,0 +1,47 @@
+import uvicorn
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.api.v1.api import api_router
+from app.core.config import settings
+
+app = FastAPI(
+    title=settings.PROJECT_NAME,
+    description=settings.PROJECT_DESCRIPTION,
+    version=settings.VERSION,
+    openapi_url="/openapi.json",
+    docs_url="/docs",
+    redoc_url="/redoc",
+)
+
+# Set up CORS middleware
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include API router
+app.include_router(api_router, prefix=settings.API_V1_STR)
+
+
+@app.get("/")
+async def root():
+    """Root endpoint returning basic info about the API."""
+    return {
+        "title": settings.PROJECT_NAME,
+        "docs": f"{settings.API_URL}/docs",
+        "health": f"{settings.API_URL}/health",
+    }
+
+
+@app.get("/health", status_code=200)
+async def health_check():
+    """Health check endpoint."""
+    return {"status": "healthy"}
+
+
+if __name__ == "__main__":
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)

migrations/README

@@ -0,0 +1 @@
+Generic single-database configuration with SQLite.

migrations/__init__.py

@@ -0,0 +1 @@
+# Empty init file to make the directory a proper Python package

migrations/env.py

@@ -0,0 +1,82 @@
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# Import models for alembic
+from app.db.base_class import Base  # noqa: E402
+
+# 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.
+fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+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():
+    """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():
+    """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
+            compare_type=True,
+        )
+
+        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():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

migrations/versions/8e3ca9ec8ac8_initial_migration.py

@@ -0,0 +1,140 @@
+"""Initial migration
+
+Revision ID: 8e3ca9ec8ac8
+Revises:
+Create Date: 2023-08-07 12:00:00.000000
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "8e3ca9ec8ac8"
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # Create users table
+    op.create_table(
+        "users",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("email", sa.String(), nullable=False),
+        sa.Column("hashed_password", sa.String(), nullable=False),
+        sa.Column("full_name", sa.String(), nullable=True),
+        sa.Column("is_active", sa.Boolean(), nullable=True, default=True),
+        sa.Column("is_superuser", sa.Boolean(), nullable=True, default=False),
+        sa.Column("created_at", sa.DateTime(), nullable=True),
+        sa.Column("updated_at", sa.DateTime(), nullable=True),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(op.f("ix_users_email"), "users", ["email"], unique=True)
+    op.create_index(op.f("ix_users_full_name"), "users", ["full_name"], unique=False)
+    op.create_index(op.f("ix_users_id"), "users", ["id"], unique=False)
+
+    # Create products table
+    op.create_table(
+        "products",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("name", sa.String(), nullable=False),
+        sa.Column("description", sa.Text(), nullable=True),
+        sa.Column("price", sa.Float(), nullable=False),
+        sa.Column("stock", sa.Integer(), nullable=False, default=0),
+        sa.Column("image_url", sa.String(), nullable=True),
+        sa.Column("created_at", sa.DateTime(), nullable=True),
+        sa.Column("updated_at", sa.DateTime(), nullable=True),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(op.f("ix_products_id"), "products", ["id"], unique=False)
+    op.create_index(op.f("ix_products_name"), "products", ["name"], unique=False)
+
+    # Create orders table
+    op.create_table(
+        "orders",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("user_id", sa.Integer(), nullable=False),
+        sa.Column(
+            "status",
+            sa.Enum(
+                "pending",
+                "paid",
+                "shipped",
+                "delivered",
+                "cancelled",
+                name="orderstatus",
+            ),
+            nullable=False,
+            default="pending",
+        ),
+        sa.Column("total_amount", sa.Float(), nullable=False),
+        sa.Column("shipping_address", sa.String(), nullable=False),
+        sa.Column("created_at", sa.DateTime(), nullable=True),
+        sa.Column("updated_at", sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["user_id"],
+            ["users.id"],
+        ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(op.f("ix_orders_id"), "orders", ["id"], unique=False)
+
+    # Create cart_items table
+    op.create_table(
+        "cart_items",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("user_id", sa.Integer(), nullable=False),
+        sa.Column("product_id", sa.Integer(), nullable=False),
+        sa.Column("quantity", sa.Integer(), nullable=False, default=1),
+        sa.Column("created_at", sa.DateTime(), nullable=True),
+        sa.Column("updated_at", sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["product_id"],
+            ["products.id"],
+        ),
+        sa.ForeignKeyConstraint(
+            ["user_id"],
+            ["users.id"],
+        ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(op.f("ix_cart_items_id"), "cart_items", ["id"], unique=False)
+
+    # Create order_items table
+    op.create_table(
+        "order_items",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("order_id", sa.Integer(), nullable=False),
+        sa.Column("product_id", sa.Integer(), nullable=False),
+        sa.Column("quantity", sa.Integer(), nullable=False),
+        sa.Column("unit_price", sa.Float(), nullable=False),
+        sa.Column("created_at", sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["order_id"],
+            ["orders.id"],
+        ),
+        sa.ForeignKeyConstraint(
+            ["product_id"],
+            ["products.id"],
+        ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(op.f("ix_order_items_id"), "order_items", ["id"], unique=False)
+
+
+def downgrade():
+    op.drop_index(op.f("ix_order_items_id"), table_name="order_items")
+    op.drop_table("order_items")
+    op.drop_index(op.f("ix_cart_items_id"), table_name="cart_items")
+    op.drop_table("cart_items")
+    op.drop_index(op.f("ix_orders_id"), table_name="orders")
+    op.drop_table("orders")
+    op.drop_index(op.f("ix_products_name"), table_name="products")
+    op.drop_index(op.f("ix_products_id"), table_name="products")
+    op.drop_table("products")
+    op.drop_index(op.f("ix_users_id"), table_name="users")
+    op.drop_index(op.f("ix_users_full_name"), table_name="users")
+    op.drop_index(op.f("ix_users_email"), table_name="users")
+    op.drop_table("users")

requirements.txt

@@ -0,0 +1,12 @@
+fastapi>=0.103.1
+uvicorn>=0.23.2
+sqlalchemy>=2.0.20
+alembic>=1.12.0
+pydantic>=2.3.0
+pydantic-settings>=2.0.3
+python-jose>=3.3.0
+passlib>=1.7.4
+python-multipart>=0.0.6
+email-validator>=2.0.0
+bcrypt>=4.0.1
+ruff>=0.0.287