app/core/auth.py

from fastapi import Depends, HTTPException, status, Header
from typing import Optional
from .config import settings

async def verify_service_token(
    x_service_token: Optional[str] = Header(None, alias="X-Service-Token")
) -> None:
    if not x_service_token:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="X-Service-Token header is missing",
        )
    if x_service_token != settings.SERVICE_TOKEN:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid service token",
        )