Protocol.check_supported: block DMs (for now)

protocol.py

@@ -1576,12 +1576,15 @@ class Protocol:
             return
 
         inner_type = as1.object_type(as1.get_object(obj.as1)) or ''
-        if (obj.type not in cls.SUPPORTED_AS1_TYPES or
-            (obj.type in as1.CRUD_VERBS
-             and inner_type
-             and inner_type not in cls.SUPPORTED_AS1_TYPES)):
+        if (obj.type not in cls.SUPPORTED_AS1_TYPES
+            or (obj.type in as1.CRUD_VERBS
+                and inner_type
+                and inner_type not in cls.SUPPORTED_AS1_TYPES)):
             error(f"Bridgy Fed for {cls.LABEL} doesn't support {obj.type} {inner_type} yet", status=204)
 
+        if as1.is_dm(obj.as1):
+            error(f"Bridgy Fed doesn't support DMs", status=204)
+
 
 @cloud_tasks_only
 def receive_task():

tests/test_protocol.py

@@ -720,6 +720,14 @@ class ProtocolTest(TestCase):
                 with self.assertRaises(NoContent):
                     Fake.check_supported(Object(our_as1=obj))
 
+        # DM
+        with self.assertRaises(NoContent):
+            Fake.check_supported(Object(our_as1={
+                'objectType': 'note',
+                'actor': 'did:alice',
+                'to': ['did:bob'],
+                'content': 'hello world',
+            }))
 
 class ProtocolReceiveTest(TestCase):