AnnounceValidator: Check for announcability

test/web/activity_pub/object_validator_test.exs

@@ -342,5 +342,34 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidatorTest do
       assert {:actor, {"already announced this object", []}} in cng.errors
       assert {:object, {"already announced by this actor", []}} in cng.errors
     end
+
+    test "returns an error if the actor can't announce the object", %{
+      announcer: announcer,
+      user: user
+    } do
+      {:ok, post_activity} =
+        CommonAPI.post(user, %{status: "a secret post", visibility: "private"})
+
+      object = Object.normalize(post_activity, false)
+
+      # Another user can't announce it
+      {:ok, announce, []} = Builder.announce(announcer, object, public: false)
+
+      {:error, cng} = ObjectValidator.validate(announce, [])
+
+      assert {:actor, {"can not announce this object", []}} in cng.errors
+
+      # The actor of the object can announce it
+      {:ok, announce, []} = Builder.announce(user, object, public: false)
+
+      assert {:ok, _, _} = ObjectValidator.validate(announce, [])
+
+      # The actor of the object can not announce it publicly 
+      {:ok, announce, []} = Builder.announce(user, object, public: true)
+
+      {:error, cng} = ObjectValidator.validate(announce, [])
+
+      assert {:actor, {"can not announce this object publicly", []}} in cng.errors
+    end
   end
 end