def perform_crs_negotation(self, request):
# don't cripple the browsable API...
if isinstance(request.accepted_renderer, BrowsableAPIRenderer):
return
# methods with request bodies need to have the CRS specified
if request.method.lower() in ("post", "put", "patch"):
content_crs = extract_header(request, HEADER_CONTENT)
if content_crs is None:
raise PreconditionFailed(
detail=f"'{HEADER_CONTENT}' header ontbreekt")
if content_crs != DEFAULT_CRS:
raise NotAcceptable(
detail=f"CRS '{content_crs}' is niet ondersteund")
if request.method.lower() == "delete":
return
# check optional header
requested_crs = extract_header(request, HEADER_ACCEPT)
if requested_crs and requested_crs != DEFAULT_CRS:
raise NotAcceptable(
detail=f"CRS '{requested_crs}' is niet ondersteund")
class PreconditionFailedView(BaseErrorView):
exception = PreconditionFailed("Something about CRS")