flows: challenge error response in challenge format

authentik/flows/challenge.py

@@ -19,6 +19,7 @@ class ChallengeTypes(Enum):
     native = "native"
     shell = "shell"
     redirect = "redirect"
+    error = "error"
 
 
 class Challenge(Serializer):

authentik/flows/stage.py

@@ -1,6 +1,6 @@
 """authentik stage Base view"""
 from collections import namedtuple
-from typing import Any, Type
+from typing import Any
 
 from django.http import HttpRequest
 from django.http.request import QueryDict
@@ -10,7 +10,7 @@ from django.views.generic import TemplateView
 
 from authentik.flows.challenge import (
     Challenge,
-    ChallengeResponse,
+    ChallengeResponse, ChallengeTypes,
     HttpChallengeResponse,
 )
 from authentik.flows.planner import PLAN_CONTEXT_PENDING_USER
@@ -85,4 +85,13 @@ class ChallengeStageView(StageView):
 
     def challenge_invalid(self, challenge: ChallengeResponse) -> HttpResponse:
         """Callback when the challenge has the incorrect format"""
-        return JsonResponse(challenge.errors)
+        challenge_response = Challenge(data={
+            "type": ChallengeTypes.error,
+            "args": {
+                "errors": challenge.errors
+            }
+        })
+        challenge_response.is_valid()
+        return HttpChallengeResponse(
+            challenge_response
+        )

authentik/stages/identification/stage.py

@@ -1,7 +1,6 @@
 """Identification stage logic"""
 from typing import Optional, Union
 
-from django.contrib import messages
 from django.db.models import Q
 from django.http import HttpResponse
 from django.urls import reverse