Generic Django view factory based on required HTTP method

views.py

from typing import Optional, Any, Callable

from django.http import HttpRequest, HttpResponse, HttpResponseNotAllowed


View = Callable[..., HttpResponse]


def view_dispatch(
    *,
    get_view: Optional[View] = None,
    post_view: Optional[View] = None,
    put_view: Optional[View] = None,
    patch_view: Optional[View] = None,
) -> View:
    _allowed_http_methods = [
        http_method
        for (http_method, view) in {
            'GET': get_view,
            'POST': post_view,
            'PUT': put_view,
            'PATCH': patch_view,
        }.items()
        if view is not None
    ]

    def _options_view() -> HttpResponse:
        response = HttpResponse()
        response['Allow'] = ', '.join(_allowed_http_methods)
        response['Content-Length'] = '0'
        return response

    def dispatch(
        request: HttpRequest, *args: Any, **kwargs: Any
    ) -> HttpResponse:
        if request.method == 'OPTIONS':
            return _options_view()
        if get_view is not None and request.method == 'GET':
            return get_view(request, *args, **kwargs)
        if post_view is not None and request.method == 'POST':
            return post_view(request, *args, **kwargs)
        if put_view is not None and request.method == 'PUT':
            return put_view(request, *args, **kwargs)
        if patch_view is not None and request.method == 'PATCH':
            return patch_view(request, *args, **kwargs)
        return HttpResponseNotAllowed(_allowed_http_methods)

    return dispatch