core/dependencies.py

from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from sqlalchemy.orm import Session
from database import get_db
from models.user import User
from core.security import decode_access_token

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/auth/login")

def get_current_user(
    token: str = Depends(oauth2_scheme),
    db: Session = Depends(get_db)
) -> User:
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Invalid or expired token",
        headers={"WWW-Authenticate": "Bearer"},
    )
    email = decode_access_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
    if not user.is_active:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="User account is inactive"
        )
    return user

def require_role(*roles: str):
    def role_checker(current_user: User = Depends(get_current_user)) -> User:
        if current_user.role not in roles:
            raise HTTPException(
                status_code=status.HTTP_403_FORBIDDEN,
                detail=f"Access denied. Required roles: {list(roles)}"
            )
        return current_user
    return role_checker

# Ready to use dependencies
require_admin = require_role("admin")
require_analyst_or_admin = require_role("analyst", "admin")
require_any = require_role("viewer", "analyst", "admin")