From e6d246882da834380ea0903fdad1fa7ef5951277 Mon Sep 17 00:00:00 2001
From: William Pitcock <nenolod@dereferenced.org>
Date: Sat, 10 Nov 2018 10:05:41 +0000
Subject: [PATCH 1/2] federator: don't federate anything other than Note
 objects to OStatus

---
 lib/pleroma/web/federator/federator.ex | 11 +++++++----
 lib/pleroma/web/ostatus/ostatus.ex     | 15 +++++++++++++++
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/lib/pleroma/web/federator/federator.ex b/lib/pleroma/web/federator/federator.ex
index 6071d08e4..962cacfa3 100644
--- a/lib/pleroma/web/federator/federator.ex
+++ b/lib/pleroma/web/federator/federator.ex
@@ -7,6 +7,7 @@ defmodule Pleroma.Web.Federator do
   alias Pleroma.Web.ActivityPub.Relay
   alias Pleroma.Web.ActivityPub.Transmogrifier
   alias Pleroma.Web.ActivityPub.Utils
+  alias Pleroma.Web.OStatus
   require Logger
 
   @websub Application.get_env(:pleroma, :websub)
@@ -63,11 +64,13 @@ def handle(:publish, activity) do
       {:ok, actor} = WebFinger.ensure_keys_present(actor)
 
       if ActivityPub.is_public?(activity) do
-        Logger.info(fn -> "Sending #{activity.data["id"]} out via WebSub" end)
-        Websub.publish(Pleroma.Web.OStatus.feed_path(actor), actor, activity)
+        if OStatus.is_representable?(activity) do
+          Logger.info(fn -> "Sending #{activity.data["id"]} out via WebSub" end)
+          Websub.publish(Pleroma.Web.OStatus.feed_path(actor), actor, activity)
 
-        Logger.info(fn -> "Sending #{activity.data["id"]} out via Salmon" end)
-        Pleroma.Web.Salmon.publish(actor, activity)
+          Logger.info(fn -> "Sending #{activity.data["id"]} out via Salmon" end)
+          Pleroma.Web.Salmon.publish(actor, activity)
+        end
 
         if Keyword.get(Application.get_env(:pleroma, :instance), :allow_relay) do
           Logger.info(fn -> "Relaying #{activity.data["id"]} out" end)
diff --git a/lib/pleroma/web/ostatus/ostatus.ex b/lib/pleroma/web/ostatus/ostatus.ex
index 916c894eb..1d0019d3b 100644
--- a/lib/pleroma/web/ostatus/ostatus.ex
+++ b/lib/pleroma/web/ostatus/ostatus.ex
@@ -11,6 +11,21 @@ defmodule Pleroma.Web.OStatus do
   alias Pleroma.Web.OStatus.{FollowHandler, UnfollowHandler, NoteHandler, DeleteHandler}
   alias Pleroma.Web.ActivityPub.Transmogrifier
 
+  def is_representable?(%Activity{data: data}) do
+    object = Object.normalize(data["object"])
+
+    cond do
+      is_nil(object) ->
+        false
+
+      object.data["type"] == "Note" ->
+        true
+
+      true ->
+        false
+    end
+  end
+
   def feed_path(user) do
     "#{user.ap_id}/feed.atom"
   end

From c9df0112155c066a6120675a8b5d974564e9ccb4 Mon Sep 17 00:00:00 2001
From: William Pitcock <nenolod@dereferenced.org>
Date: Sat, 10 Nov 2018 10:39:42 +0000
Subject: [PATCH 2/2] tests: add tests for new OStatus.is_representable?
 function

---
 test/web/ostatus/ostatus_test.exs | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/test/web/ostatus/ostatus_test.exs b/test/web/ostatus/ostatus_test.exs
index f095e41dd..f95da8b0a 100644
--- a/test/web/ostatus/ostatus_test.exs
+++ b/test/web/ostatus/ostatus_test.exs
@@ -456,4 +456,28 @@ test "it doesn't add nil in the do field" do
              "https://www.w3.org/ns/activitystreams#Public"
            ]
   end
+
+  describe "is_representable?" do
+    test "Note objects are representable" do
+      note_activity = insert(:note_activity)
+
+      assert OStatus.is_representable?(note_activity)
+    end
+
+    test "Article objects are not representable" do
+      note_activity = insert(:note_activity)
+
+      note_object = Object.normalize(note_activity.data["object"])
+
+      note_data =
+        note_object.data
+        |> Map.put("type", "Article")
+
+      cs = Object.change(note_object, %{data: note_data})
+      {:ok, article_object} = Repo.update(cs)
+
+      # the underlying object is now an Article instead of a note, so this should fail
+      refute OStatus.is_representable?(note_activity)
+    end
+  end
 end