Parametrisierter View-Dekorator für dynamische Anfragen-Ablaufsteuerung

from functools import wraps
from django.http import HttpResponseForbidden, HttpRequest
from typing import Callable, Any
 
def require_header_flag(header_name: str, expected_value: str):
    """Higher-order decorator controlling view execution flow based on request headers."""
    def decorator(view_func: Callable[..., Any]) -> Callable[..., Any]:
        @wraps(view_func)
        def _wrapped_view(request: HttpRequest, *args: Any, **kwargs: Any):
            header_val = request.headers.get(header_name)
            if header_val != expected_value:
                return HttpResponseForbidden(f"Missing or invalid header: {header_name}")
            return view_func(request, *args, **kwargs)
        return _wrapped_view
    return decorator