Implement complete beat marketplace API with FastAPI

- Set up FastAPI project structure with main.py and requirements.txt
- Created SQLite database models for users, beats, and transactions
- Implemented Alembic database migrations
- Added user authentication system with JWT tokens
- Created beat management endpoints (CRUD operations)
- Implemented purchase/transaction system
- Added file upload/download functionality for beat files
- Created health endpoint and API documentation
- Updated README with comprehensive documentation
- Fixed all linting issues with Ruff

Environment variables needed:
- SECRET_KEY: JWT secret key for authentication

README.md

@@ -1,3 +1,92 @@
-# FastAPI Application
+# Beat Marketplace API
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A REST API for selling beats built with FastAPI and SQLite.
+
+## Features
+
+- User registration and authentication
+- Beat management (CRUD operations)
+- File upload for beats and previews
+- Purchase/transaction system
+- Producer and buyer roles
+- File downloads for purchased beats
+- Health check endpoint
+
+## Installation
+
+1. Install dependencies:
+```bash
+pip install -r requirements.txt
+```
+
+2. Run the application:
+```bash
+uvicorn main:app --reload
+```
+
+## Environment Variables
+
+Set the following environment variables for production:
+
+- `SECRET_KEY`: JWT secret key for authentication (required)
+
+## API Endpoints
+
+### Authentication
+- `POST /api/v1/auth/register` - Register a new user
+- `POST /api/v1/auth/login` - Login and get access token
+
+### Beats
+- `GET /api/v1/beats/` - Get all available beats
+- `GET /api/v1/beats/{beat_id}` - Get specific beat
+- `POST /api/v1/beats/` - Create new beat (producers only)
+- `PUT /api/v1/beats/{beat_id}` - Update beat (producers only)
+- `DELETE /api/v1/beats/{beat_id}` - Delete beat (producers only)
+- `POST /api/v1/beats/{beat_id}/upload-file` - Upload beat file
+- `POST /api/v1/beats/{beat_id}/upload-preview` - Upload beat preview
+
+### Transactions
+- `GET /api/v1/transactions/` - Get user's transactions
+- `GET /api/v1/transactions/{transaction_id}` - Get specific transaction
+- `POST /api/v1/transactions/purchase` - Purchase a beat
+- `PUT /api/v1/transactions/{transaction_id}/complete` - Complete transaction
+- `GET /api/v1/transactions/producer/sales` - Get producer's sales
+
+### Files
+- `GET /api/v1/files/download/{beat_id}` - Download purchased beat
+- `GET /api/v1/files/preview/{beat_id}` - Get beat preview
+
+### Health
+- `GET /health` - Health check endpoint
+- `GET /` - API information
+
+## Database
+
+The application uses SQLite database with the following models:
+- Users (authentication and profiles)
+- Beats (music files and metadata)
+- Transactions (purchase records)
+
+Database file is stored at: `/app/storage/db/db.sqlite`
+
+## File Storage
+
+Beat files are stored in: `/app/storage/beats/`
+Preview files are stored in: `/app/storage/beats/previews/`
+
+## Documentation
+
+- API documentation available at `/docs`
+- ReDoc documentation available at `/redoc`
+- OpenAPI schema available at `/openapi.json`
+
+## Development
+
+Run with auto-reload:
+```bash
+uvicorn main:app --reload --host 0.0.0.0 --port 8000
+```
+
+## Testing
+
+The application includes a health check endpoint for monitoring.

alembic.ini

@@ -0,0 +1,40 @@
+[alembic]
+script_location = alembic
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+version_path_separator = os
+
+[post_write_hooks]
+
+[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

alembic/env.py

@@ -0,0 +1,51 @@
+from logging.config import fileConfig
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+from alembic import context
+import sys
+import os
+
+sys.path.append(os.path.dirname(os.path.dirname(__file__)))
+
+from app.db.base import Base
+
+config = context.config
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+def run_migrations_offline():
+    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():
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection, target_metadata=target_metadata
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

alembic/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"}

alembic/versions/001_initial_migration.py

@@ -0,0 +1,80 @@
+"""Initial migration
+
+Revision ID: 001
+Revises: 
+Create Date: 2024-01-01 00:00:00.000000
+
+"""
+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():
+    # ### commands auto generated by Alembic - please adjust! ###
+    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=False),
+    sa.Column('is_active', sa.Boolean(), nullable=True),
+    sa.Column('is_producer', sa.Boolean(), 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_users_email'), 'users', ['email'], unique=True)
+    op.create_index(op.f('ix_users_id'), 'users', ['id'], unique=False)
+    op.create_table('beats',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('title', sa.String(), nullable=False),
+    sa.Column('description', sa.String(), nullable=True),
+    sa.Column('price', sa.Float(), nullable=False),
+    sa.Column('genre', sa.String(), nullable=False),
+    sa.Column('bpm', sa.Integer(), nullable=True),
+    sa.Column('key', sa.String(), nullable=True),
+    sa.Column('file_path', sa.String(), nullable=False),
+    sa.Column('preview_path', sa.String(), nullable=True),
+    sa.Column('artwork_path', sa.String(), nullable=True),
+    sa.Column('is_available', sa.Boolean(), nullable=True),
+    sa.Column('producer_id', sa.Integer(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=True),
+    sa.Column('updated_at', sa.DateTime(), nullable=True),
+    sa.ForeignKeyConstraint(['producer_id'], ['users.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_beats_id'), 'beats', ['id'], unique=False)
+    op.create_table('transactions',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('buyer_id', sa.Integer(), nullable=False),
+    sa.Column('beat_id', sa.Integer(), nullable=False),
+    sa.Column('amount', sa.Float(), nullable=False),
+    sa.Column('status', sa.Enum('PENDING', 'COMPLETED', 'FAILED', 'REFUNDED', name='transactionstatus'), nullable=True),
+    sa.Column('transaction_reference', sa.String(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=True),
+    sa.Column('updated_at', sa.DateTime(), nullable=True),
+    sa.ForeignKeyConstraint(['beat_id'], ['beats.id'], ),
+    sa.ForeignKeyConstraint(['buyer_id'], ['users.id'], ),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('transaction_reference')
+    )
+    op.create_index(op.f('ix_transactions_id'), 'transactions', ['id'], unique=False)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_transactions_id'), table_name='transactions')
+    op.drop_table('transactions')
+    op.drop_index(op.f('ix_beats_id'), table_name='beats')
+    op.drop_table('beats')
+    op.drop_index(op.f('ix_users_id'), table_name='users')
+    op.drop_index(op.f('ix_users_email'), table_name='users')
+    op.drop_table('users')
+    # ### end Alembic commands ###

app/api/auth.py

@@ -0,0 +1,46 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from datetime import timedelta
+from app.db.session import get_db
+from app.models.user import User
+from app.schemas.user import UserCreate, UserLogin, Token, UserResponse
+from app.core.security import verify_password, get_password_hash, create_access_token, ACCESS_TOKEN_EXPIRE_MINUTES
+
+router = APIRouter()
+
+@router.post("/register", response_model=UserResponse)
+async def register(user: UserCreate, db: Session = Depends(get_db)):
+    db_user = db.query(User).filter(User.email == user.email).first()
+    if db_user:
+        raise HTTPException(
+            status_code=400,
+            detail="Email already registered"
+        )
+    
+    hashed_password = get_password_hash(user.password)
+    db_user = User(
+        email=user.email,
+        hashed_password=hashed_password,
+        full_name=user.full_name,
+        is_producer=user.is_producer
+    )
+    db.add(db_user)
+    db.commit()
+    db.refresh(db_user)
+    return db_user
+
+@router.post("/login", response_model=Token)
+async def login(user_credentials: UserLogin, db: Session = Depends(get_db)):
+    user = db.query(User).filter(User.email == user_credentials.email).first()
+    if not user or not verify_password(user_credentials.password, user.hashed_password):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect email or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    
+    access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
+    access_token = create_access_token(
+        data={"sub": user.email}, expires_delta=access_token_expires
+    )
+    return {"access_token": access_token, "token_type": "bearer"}

app/api/beats.py

@@ -0,0 +1,138 @@
+from fastapi import APIRouter, Depends, HTTPException, UploadFile, File
+from sqlalchemy.orm import Session
+from typing import List, Optional
+from app.db.session import get_db
+from app.models.beat import Beat
+from app.models.user import User
+from app.schemas.beat import BeatCreate, BeatUpdate, BeatResponse
+from app.services.auth import get_current_producer
+import shutil
+from pathlib import Path
+
+router = APIRouter()
+
+@router.get("/", response_model=List[BeatResponse])
+async def get_beats(
+    skip: int = 0,
+    limit: int = 100,
+    genre: Optional[str] = None,
+    producer_id: Optional[int] = None,
+    db: Session = Depends(get_db)
+):
+    query = db.query(Beat).filter(Beat.is_available)
+    
+    if genre:
+        query = query.filter(Beat.genre == genre)
+    if producer_id:
+        query = query.filter(Beat.producer_id == producer_id)
+    
+    beats = query.offset(skip).limit(limit).all()
+    return beats
+
+@router.get("/{beat_id}", response_model=BeatResponse)
+async def get_beat(beat_id: int, db: Session = Depends(get_db)):
+    beat = db.query(Beat).filter(Beat.id == beat_id, Beat.is_available).first()
+    if not beat:
+        raise HTTPException(status_code=404, detail="Beat not found")
+    return beat
+
+@router.post("/", response_model=BeatResponse)
+async def create_beat(
+    beat: BeatCreate,
+    current_user: User = Depends(get_current_producer),
+    db: Session = Depends(get_db)
+):
+    db_beat = Beat(
+        **beat.dict(),
+        producer_id=current_user.id,
+        file_path="",  # Will be set when file is uploaded
+    )
+    db.add(db_beat)
+    db.commit()
+    db.refresh(db_beat)
+    return db_beat
+
+@router.put("/{beat_id}", response_model=BeatResponse)
+async def update_beat(
+    beat_id: int,
+    beat_update: BeatUpdate,
+    current_user: User = Depends(get_current_producer),
+    db: Session = Depends(get_db)
+):
+    beat = db.query(Beat).filter(Beat.id == beat_id, Beat.producer_id == current_user.id).first()
+    if not beat:
+        raise HTTPException(status_code=404, detail="Beat not found")
+    
+    update_data = beat_update.dict(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(beat, field, value)
+    
+    db.commit()
+    db.refresh(beat)
+    return beat
+
+@router.delete("/{beat_id}")
+async def delete_beat(
+    beat_id: int,
+    current_user: User = Depends(get_current_producer),
+    db: Session = Depends(get_db)
+):
+    beat = db.query(Beat).filter(Beat.id == beat_id, Beat.producer_id == current_user.id).first()
+    if not beat:
+        raise HTTPException(status_code=404, detail="Beat not found")
+    
+    beat.is_available = False
+    db.commit()
+    return {"message": "Beat deleted successfully"}
+
+@router.post("/{beat_id}/upload-file")
+async def upload_beat_file(
+    beat_id: int,
+    file: UploadFile = File(...),
+    current_user: User = Depends(get_current_producer),
+    db: Session = Depends(get_db)
+):
+    beat = db.query(Beat).filter(Beat.id == beat_id, Beat.producer_id == current_user.id).first()
+    if not beat:
+        raise HTTPException(status_code=404, detail="Beat not found")
+    
+    if not file.filename.endswith(('.mp3', '.wav', '.flac')):
+        raise HTTPException(status_code=400, detail="Invalid file format")
+    
+    storage_dir = Path("/app/storage/beats")
+    storage_dir.mkdir(parents=True, exist_ok=True)
+    
+    file_path = storage_dir / f"{beat_id}_{file.filename}"
+    with open(file_path, "wb") as buffer:
+        shutil.copyfileobj(file.file, buffer)
+    
+    beat.file_path = str(file_path)
+    db.commit()
+    
+    return {"message": "File uploaded successfully", "file_path": str(file_path)}
+
+@router.post("/{beat_id}/upload-preview")
+async def upload_beat_preview(
+    beat_id: int,
+    file: UploadFile = File(...),
+    current_user: User = Depends(get_current_producer),
+    db: Session = Depends(get_db)
+):
+    beat = db.query(Beat).filter(Beat.id == beat_id, Beat.producer_id == current_user.id).first()
+    if not beat:
+        raise HTTPException(status_code=404, detail="Beat not found")
+    
+    if not file.filename.endswith(('.mp3', '.wav')):
+        raise HTTPException(status_code=400, detail="Invalid file format")
+    
+    storage_dir = Path("/app/storage/beats/previews")
+    storage_dir.mkdir(parents=True, exist_ok=True)
+    
+    file_path = storage_dir / f"{beat_id}_preview_{file.filename}"
+    with open(file_path, "wb") as buffer:
+        shutil.copyfileobj(file.file, buffer)
+    
+    beat.preview_path = str(file_path)
+    db.commit()
+    
+    return {"message": "Preview uploaded successfully", "preview_path": str(file_path)}

app/api/files.py

@@ -0,0 +1,66 @@
+from fastapi import APIRouter, Depends, HTTPException
+from fastapi.responses import FileResponse
+from sqlalchemy.orm import Session
+from pathlib import Path
+from app.db.session import get_db
+from app.models.transaction import Transaction, TransactionStatus
+from app.models.beat import Beat
+from app.models.user import User
+from app.services.auth import get_current_active_user
+
+router = APIRouter()
+
+@router.get("/download/{beat_id}")
+async def download_beat(
+    beat_id: int,
+    current_user: User = Depends(get_current_active_user),
+    db: Session = Depends(get_db)
+):
+    # Check if user has purchased this beat
+    transaction = db.query(Transaction).filter(
+        Transaction.buyer_id == current_user.id,
+        Transaction.beat_id == beat_id,
+        Transaction.status == TransactionStatus.COMPLETED
+    ).first()
+    
+    if not transaction:
+        # Check if user is the producer of this beat
+        beat = db.query(Beat).filter(
+            Beat.id == beat_id,
+            Beat.producer_id == current_user.id
+        ).first()
+        if not beat:
+            raise HTTPException(status_code=403, detail="Access denied - beat not purchased")
+    else:
+        beat = transaction.beat
+    
+    if not beat.file_path or not Path(beat.file_path).exists():
+        raise HTTPException(status_code=404, detail="Beat file not found")
+    
+    return FileResponse(
+        beat.file_path,
+        media_type='application/octet-stream',
+        filename=f"{beat.title}.{beat.file_path.split('.')[-1]}"
+    )
+
+@router.get("/preview/{beat_id}")
+async def get_beat_preview(
+    beat_id: int,
+    db: Session = Depends(get_db)
+):
+    beat = db.query(Beat).filter(
+        Beat.id == beat_id,
+        Beat.is_available
+    ).first()
+    
+    if not beat:
+        raise HTTPException(status_code=404, detail="Beat not found")
+    
+    if not beat.preview_path or not Path(beat.preview_path).exists():
+        raise HTTPException(status_code=404, detail="Preview not available")
+    
+    return FileResponse(
+        beat.preview_path,
+        media_type='audio/mpeg',
+        filename=f"{beat.title}_preview.{beat.preview_path.split('.')[-1]}"
+    )

app/api/transactions.py

@@ -0,0 +1,117 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from typing import List
+from app.db.session import get_db
+from app.models.transaction import Transaction, TransactionStatus
+from app.models.beat import Beat
+from app.models.user import User
+from app.schemas.transaction import TransactionCreate, TransactionResponse
+from app.services.auth import get_current_active_user
+import uuid
+
+router = APIRouter()
+
+@router.get("/", response_model=List[TransactionResponse])
+async def get_user_transactions(
+    current_user: User = Depends(get_current_active_user),
+    db: Session = Depends(get_db)
+):
+    transactions = db.query(Transaction).filter(Transaction.buyer_id == current_user.id).all()
+    return transactions
+
+@router.get("/{transaction_id}", response_model=TransactionResponse)
+async def get_transaction(
+    transaction_id: int,
+    current_user: User = Depends(get_current_active_user),
+    db: Session = Depends(get_db)
+):
+    transaction = db.query(Transaction).filter(
+        Transaction.id == transaction_id,
+        Transaction.buyer_id == current_user.id
+    ).first()
+    if not transaction:
+        raise HTTPException(status_code=404, detail="Transaction not found")
+    return transaction
+
+@router.post("/purchase", response_model=TransactionResponse)
+async def purchase_beat(
+    purchase_data: TransactionCreate,
+    current_user: User = Depends(get_current_active_user),
+    db: Session = Depends(get_db)
+):
+    # Check if beat exists and is available
+    beat = db.query(Beat).filter(
+        Beat.id == purchase_data.beat_id,
+        Beat.is_available
+    ).first()
+    if not beat:
+        raise HTTPException(status_code=404, detail="Beat not found or not available")
+    
+    # Check if user is trying to buy their own beat
+    if beat.producer_id == current_user.id:
+        raise HTTPException(status_code=400, detail="Cannot purchase your own beat")
+    
+    # Check if user has already purchased this beat
+    existing_purchase = db.query(Transaction).filter(
+        Transaction.buyer_id == current_user.id,
+        Transaction.beat_id == purchase_data.beat_id,
+        Transaction.status == TransactionStatus.COMPLETED
+    ).first()
+    if existing_purchase:
+        raise HTTPException(status_code=400, detail="Beat already purchased")
+    
+    # Validate amount matches beat price
+    if purchase_data.amount != beat.price:
+        raise HTTPException(status_code=400, detail="Amount does not match beat price")
+    
+    # Create transaction
+    transaction = Transaction(
+        buyer_id=current_user.id,
+        beat_id=purchase_data.beat_id,
+        amount=purchase_data.amount,
+        status=TransactionStatus.PENDING,
+        transaction_reference=str(uuid.uuid4())
+    )
+    db.add(transaction)
+    db.commit()
+    db.refresh(transaction)
+    
+    return transaction
+
+@router.put("/{transaction_id}/complete")
+async def complete_transaction(
+    transaction_id: int,
+    current_user: User = Depends(get_current_active_user),
+    db: Session = Depends(get_db)
+):
+    transaction = db.query(Transaction).filter(
+        Transaction.id == transaction_id,
+        Transaction.buyer_id == current_user.id,
+        Transaction.status == TransactionStatus.PENDING
+    ).first()
+    if not transaction:
+        raise HTTPException(status_code=404, detail="Transaction not found or not pending")
+    
+    # In a real application, this would integrate with a payment processor
+    # For now, we'll just mark it as completed
+    transaction.status = TransactionStatus.COMPLETED
+    db.commit()
+    db.refresh(transaction)
+    
+    return {"message": "Transaction completed successfully", "transaction": transaction}
+
+@router.get("/producer/sales", response_model=List[TransactionResponse])
+async def get_producer_sales(
+    current_user: User = Depends(get_current_active_user),
+    db: Session = Depends(get_db)
+):
+    if not current_user.is_producer:
+        raise HTTPException(status_code=403, detail="Not a producer")
+    
+    # Get all transactions for beats owned by this producer
+    transactions = db.query(Transaction).join(Beat).filter(
+        Beat.producer_id == current_user.id,
+        Transaction.status == TransactionStatus.COMPLETED
+    ).all()
+    
+    return transactions

app/core/security.py

@@ -0,0 +1,37 @@
+from datetime import datetime, timedelta
+from typing import Optional
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+import os
+
+SECRET_KEY = os.getenv("SECRET_KEY", "your-secret-key-here")
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 30
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    return pwd_context.verify(plain_password, hashed_password)
+
+def get_password_hash(password: str) -> str:
+    return pwd_context.hash(password)
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+def verify_token(token: str) -> Optional[str]:
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        email: str = payload.get("sub")
+        if email is None:
+            return None
+        return email
+    except JWTError:
+        return None

app/db/base.py

@@ -0,0 +1,18 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+from pathlib import Path
+
+DB_DIR = Path("/app/storage/db")
+DB_DIR.mkdir(parents=True, exist_ok=True)
+
+SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_DIR}/db.sqlite"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()

app/db/session.py

@@ -0,0 +1,16 @@
+from app.db.base import SessionLocal, engine, Base
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+def init_db():
+    # Import models to register them with SQLAlchemy
+    from app.models.user import User  # noqa: F401
+    from app.models.beat import Beat  # noqa: F401
+    from app.models.transaction import Transaction  # noqa: F401
+    
+    Base.metadata.create_all(bind=engine)

app/models/beat.py

@@ -0,0 +1,23 @@
+from sqlalchemy import Column, Integer, String, Float, Boolean, DateTime, ForeignKey, func
+from sqlalchemy.orm import relationship
+from app.db.base import Base
+
+class Beat(Base):
+    __tablename__ = "beats"
+
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String, nullable=False)
+    description = Column(String)
+    price = Column(Float, nullable=False)
+    genre = Column(String, nullable=False)
+    bpm = Column(Integer)
+    key = Column(String)
+    file_path = Column(String, nullable=False)
+    preview_path = Column(String)
+    artwork_path = Column(String)
+    is_available = Column(Boolean, default=True)
+    producer_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    created_at = Column(DateTime, default=func.now())
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())
+
+    producer = relationship("User", back_populates="beats")

app/models/transaction.py

@@ -0,0 +1,25 @@
+import enum
+from sqlalchemy import Column, Integer, String, Float, DateTime, ForeignKey, func, Enum
+from sqlalchemy.orm import relationship
+from app.db.base import Base
+
+class TransactionStatus(enum.Enum):
+    PENDING = "pending"
+    COMPLETED = "completed"
+    FAILED = "failed"
+    REFUNDED = "refunded"
+
+class Transaction(Base):
+    __tablename__ = "transactions"
+
+    id = Column(Integer, primary_key=True, index=True)
+    buyer_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    beat_id = Column(Integer, ForeignKey("beats.id"), nullable=False)
+    amount = Column(Float, nullable=False)
+    status = Column(Enum(TransactionStatus), default=TransactionStatus.PENDING)
+    transaction_reference = Column(String, unique=True, nullable=False)
+    created_at = Column(DateTime, default=func.now())
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())
+
+    buyer = relationship("User", foreign_keys=[buyer_id])
+    beat = relationship("Beat")

app/models/user.py

@@ -0,0 +1,17 @@
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, func
+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, nullable=False)
+    is_active = Column(Boolean, default=True)
+    is_producer = Column(Boolean, default=False)
+    created_at = Column(DateTime, default=func.now())
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())
+
+    beats = relationship("Beat", back_populates="producer")

app/schemas/beat.py

@@ -0,0 +1,36 @@
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime
+
+class BeatBase(BaseModel):
+    title: str
+    description: Optional[str] = None
+    price: float
+    genre: str
+    bpm: Optional[int] = None
+    key: Optional[str] = None
+
+class BeatCreate(BeatBase):
+    pass
+
+class BeatUpdate(BaseModel):
+    title: Optional[str] = None
+    description: Optional[str] = None
+    price: Optional[float] = None
+    genre: Optional[str] = None
+    bpm: Optional[int] = None
+    key: Optional[str] = None
+    is_available: Optional[bool] = None
+
+class BeatResponse(BeatBase):
+    id: int
+    file_path: str
+    preview_path: Optional[str] = None
+    artwork_path: Optional[str] = None
+    is_available: bool
+    producer_id: int
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True

app/schemas/transaction.py

@@ -0,0 +1,25 @@
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime
+from app.models.transaction import TransactionStatus
+
+class TransactionBase(BaseModel):
+    beat_id: int
+    amount: float
+
+class TransactionCreate(TransactionBase):
+    pass
+
+class TransactionUpdate(BaseModel):
+    status: Optional[TransactionStatus] = None
+
+class TransactionResponse(TransactionBase):
+    id: int
+    buyer_id: int
+    status: TransactionStatus
+    transaction_reference: str
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True

app/schemas/user.py

@@ -0,0 +1,35 @@
+from pydantic import BaseModel, EmailStr
+from typing import Optional
+from datetime import datetime
+
+class UserBase(BaseModel):
+    email: EmailStr
+    full_name: str
+    is_producer: bool = False
+
+class UserCreate(UserBase):
+    password: str
+
+class UserUpdate(BaseModel):
+    full_name: Optional[str] = None
+    is_producer: Optional[bool] = None
+
+class UserResponse(UserBase):
+    id: int
+    is_active: bool
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+class UserLogin(BaseModel):
+    email: EmailStr
+    password: str
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+class TokenData(BaseModel):
+    email: Optional[str] = None

app/services/auth.py

@@ -0,0 +1,36 @@
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from sqlalchemy.orm import Session
+from app.db.session import get_db
+from app.models.user import User
+from app.core.security import verify_token
+
+security = HTTPBearer()
+
+async def get_current_user(credentials: HTTPAuthorizationCredentials = Depends(security), db: Session = Depends(get_db)):
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    
+    token = credentials.credentials
+    email = verify_token(token)
+    if email is None:
+        raise credentials_exception
+    
+    user = db.query(User).filter(User.email == email).first()
+    if user is None:
+        raise credentials_exception
+    
+    return user
+
+async def get_current_active_user(current_user: User = Depends(get_current_user)):
+    if not current_user.is_active:
+        raise HTTPException(status_code=400, detail="Inactive user")
+    return current_user
+
+async def get_current_producer(current_user: User = Depends(get_current_active_user)):
+    if not current_user.is_producer:
+        raise HTTPException(status_code=403, detail="Not a producer")
+    return current_user

main.py

@@ -0,0 +1,44 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from app.db.session import init_db
+from app.api.auth import router as auth_router
+from app.api.beats import router as beats_router
+from app.api.transactions import router as transactions_router
+from app.api.files import router as files_router
+
+app = FastAPI(
+    title="Beat Marketplace API",
+    description="A REST API for selling beats",
+    version="1.0.0",
+    openapi_url="/openapi.json"
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(auth_router, prefix="/api/v1/auth", tags=["authentication"])
+app.include_router(beats_router, prefix="/api/v1/beats", tags=["beats"])
+app.include_router(transactions_router, prefix="/api/v1/transactions", tags=["transactions"])
+app.include_router(files_router, prefix="/api/v1/files", tags=["files"])
+
+@app.on_event("startup")
+async def startup_event():
+    init_db()
+
+@app.get("/")
+async def root():
+    return {
+        "title": "Beat Marketplace API",
+        "description": "A REST API for selling beats",
+        "documentation": "/docs",
+        "health_check": "/health"
+    }
+
+@app.get("/health")
+async def health_check():
+    return {"status": "healthy", "service": "Beat Marketplace API"}

requirements.txt

@@ -0,0 +1,9 @@
+fastapi==0.104.1
+uvicorn==0.24.0
+sqlalchemy==2.0.23
+alembic==1.13.0
+python-multipart==0.0.6
+python-jose[cryptography]==3.3.0
+passlib[bcrypt]==1.7.4
+python-dotenv==1.0.0
+ruff==0.1.6