From 923584d0467b2213bef0d3d78c8713f34b7b21d7 Mon Sep 17 00:00:00 2001
From: Roger Braun <roger@rogerbraun.net>
Date: Sat, 22 Apr 2017 14:37:54 +0200
Subject: [PATCH] Remove unknown activities from feed.

---
 lib/pleroma/web/ostatus/activity_representer.ex | 2 ++
 lib/pleroma/web/ostatus/feed_representer.ex     | 1 +
 lib/pleroma/web/websub/websub.ex                | 1 -
 test/web/ostatus/activity_representer_test.exs  | 7 ++++++-
 4 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/lib/pleroma/web/ostatus/activity_representer.ex b/lib/pleroma/web/ostatus/activity_representer.ex
index daaa4ef03..590abc8bb 100644
--- a/lib/pleroma/web/ostatus/activity_representer.ex
+++ b/lib/pleroma/web/ostatus/activity_representer.ex
@@ -22,4 +22,6 @@ defmodule Pleroma.Web.OStatus.ActivityRepresenter do
       {:updated, h.(updated_at)}
     ] ++ attachments
   end
+
+  def to_simple_form(_,_), do: nil
 end
diff --git a/lib/pleroma/web/ostatus/feed_representer.ex b/lib/pleroma/web/ostatus/feed_representer.ex
index 42be5f793..c9cd12937 100644
--- a/lib/pleroma/web/ostatus/feed_representer.ex
+++ b/lib/pleroma/web/ostatus/feed_representer.ex
@@ -11,6 +11,7 @@ defmodule Pleroma.Web.OStatus.FeedRepresenter do
     entries = Enum.map(activities, fn(activity) ->
       {:entry, ActivityRepresenter.to_simple_form(activity, user)}
     end)
+    |> Enum.filter(fn ({_, form}) -> form end)
 
     [{
       :feed, [
diff --git a/lib/pleroma/web/websub/websub.ex b/lib/pleroma/web/websub/websub.ex
index cf819afd1..cc66b52dd 100644
--- a/lib/pleroma/web/websub/websub.ex
+++ b/lib/pleroma/web/websub/websub.ex
@@ -1,6 +1,5 @@
 defmodule Pleroma.Web.Websub do
   alias Pleroma.Repo
-  alias Pleroma.Websub
   alias Pleroma.Web.Websub.WebsubServerSubscription
   alias Pleroma.Web.OStatus.FeedRepresenter
   alias Pleroma.Web.OStatus
diff --git a/test/web/ostatus/activity_representer_test.exs b/test/web/ostatus/activity_representer_test.exs
index de79717b1..61df41a1d 100644
--- a/test/web/ostatus/activity_representer_test.exs
+++ b/test/web/ostatus/activity_representer_test.exs
@@ -2,7 +2,7 @@ defmodule Pleroma.Web.OStatus.ActivityRepresenterTest do
   use Pleroma.DataCase
 
   alias Pleroma.Web.OStatus.ActivityRepresenter
-  alias Pleroma.User
+  alias Pleroma.{User, Activity}
 
   import Pleroma.Factory
 
@@ -32,6 +32,11 @@ defmodule Pleroma.Web.OStatus.ActivityRepresenterTest do
     assert clean(res) == clean(expected)
   end
 
+  test "an unknown activity" do
+    tuple = ActivityRepresenter.to_simple_form(%Activity{}, nil)
+    assert is_nil(tuple)
+  end
+
   defp clean(string) do
     String.replace(string, ~r/\s/, "")
   end