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backend/app/core/deps.py

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+"""
+Tool_OCR - FastAPI Dependencies
+Authentication and database session dependencies
+"""
+
+from typing import Generator, Optional
+import logging
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from sqlalchemy.orm import Session
+
+from app.core.database import SessionLocal
+from app.core.security import decode_access_token
+from app.models.user import User
+
+
+logger = logging.getLogger(__name__)
+
+
+# HTTP Bearer token security scheme
+security = HTTPBearer()
+
+
+def get_db() -> Generator:
+    """
+    Database session dependency
+
+    Yields:
+        Session: SQLAlchemy database session
+    """
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(security),
+    db: Session = Depends(get_db)
+) -> User:
+    """
+    Get current authenticated user from JWT token
+
+    Args:
+        credentials: HTTP Bearer credentials
+        db: Database session
+
+    Returns:
+        User: Current user object
+
+    Raises:
+        HTTPException: If token is invalid or user not found
+    """
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+
+    # Extract token
+    token = credentials.credentials
+
+    # Decode token
+    payload = decode_access_token(token)
+    if payload is None:
+        raise credentials_exception
+
+    # Extract user ID from token (convert from string to int)
+    user_id_str: Optional[str] = payload.get("sub")
+    if user_id_str is None:
+        raise credentials_exception
+
+    try:
+        user_id: int = int(user_id_str)
+    except (ValueError, TypeError):
+        raise credentials_exception
+
+    # Query user from database
+    user = db.query(User).filter(User.id == user_id).first()
+    if user is None:
+        raise credentials_exception
+
+    # Check if user is active
+    if not user.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Inactive user"
+        )
+
+    return user
+
+
+def get_current_active_user(
+    current_user: User = Depends(get_current_user)
+) -> User:
+    """
+    Get current active user
+
+    Args:
+        current_user: Current user from get_current_user
+
+    Returns:
+        User: Current active user
+
+    Raises:
+        HTTPException: If user is inactive
+    """
+    if not current_user.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Inactive user"
+        )
+    return current_user
+
+
+def get_current_admin_user(
+    current_user: User = Depends(get_current_user)
+) -> User:
+    """
+    Get current admin user
+
+    Args:
+        current_user: Current user from get_current_user
+
+    Returns:
+        User: Current admin user
+
+    Raises:
+        HTTPException: If user is not admin
+    """
+    if not current_user.is_admin:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough privileges"
+        )
+    return current_user