Updates inbox view

bookwyrm/views/inbox.py

@@ -3,8 +3,9 @@ import json
 import re
 from urllib.parse import urldefrag
 
-from django.http import HttpResponse, HttpResponseNotFound
-from django.http import HttpResponseBadRequest, HttpResponseForbidden
+from django.http import HttpResponse, Http404
+from django.core.exceptions import BadRequest, PermissionDenied
+from django.shortcuts import get_object_or_404
 from django.utils.decorators import method_decorator
 from django.views import View
 from django.views.decorators.csrf import csrf_exempt
@@ -21,36 +22,30 @@ from bookwyrm.utils import regex
 class Inbox(View):
     """requests sent by outside servers"""
 
-    # pylint: disable=too-many-return-statements
     def post(self, request, username=None):
         """only works as POST request"""
         # first check if this server is on our shitlist
-        if is_blocked_user_agent(request):
-            return HttpResponseForbidden()
+        raise_is_blocked_user_agent(request)
 
         # make sure the user's inbox even exists
         if username:
-            try:
-                models.User.objects.get(localname=username)
-            except models.User.DoesNotExist:
-                return HttpResponseNotFound()
+            get_object_or_404(models.User, localname=username, is_active=True)
 
         # is it valid json? does it at least vaguely resemble an activity?
         try:
             activity_json = json.loads(request.body)
         except json.decoder.JSONDecodeError:
-            return HttpResponseBadRequest()
+            raise BadRequest()
 
         # let's be extra sure we didn't block this domain
-        if is_blocked_activity(activity_json):
-            return HttpResponseForbidden()
+        raise_is_blocked_activity(activity_json)
 
         if (
             not "object" in activity_json
             or not "type" in activity_json
             or not activity_json["type"] in activitypub.activity_objects
         ):
-            return HttpResponseNotFound()
+            raise Http404()
 
         # verify the signature
         if not has_valid_signature(request, activity_json):
@@ -65,32 +60,35 @@ class Inbox(View):
         return HttpResponse()
 
 
-def is_blocked_user_agent(request):
+def raise_is_blocked_user_agent(request):
     """check if a request is from a blocked server based on user agent"""
     # check user agent
     user_agent = request.headers.get("User-Agent")
     if not user_agent:
-        return False
+        return
     url = re.search(rf"https?://{regex.DOMAIN}/?", user_agent)
     if not url:
-        return False
+        return
     url = url.group()
-    return models.FederatedServer.is_blocked(url)
+    if models.FederatedServer.is_blocked(url):
+        raise PermissionDenied()
 
 
-def is_blocked_activity(activity_json):
+def raise_is_blocked_activity(activity_json):
     """get the sender out of activity json and check if it's blocked"""
     actor = activity_json.get("actor")
 
     # check if the user is banned/deleted
     existing = models.User.find_existing_by_remote_id(actor)
     if existing and existing.deleted:
-        return True
+        raise PermissionDenied()
 
     if not actor:
         # well I guess it's not even a valid activity so who knows
-        return False
-    return models.FederatedServer.is_blocked(actor)
+        return
+
+    if models.FederatedServer.is_blocked(actor):
+        raise PermissionDenied()
 
 
 @app.task(queue="medium_priority")