From 9a69f08e86ce79a36dfe3d1a6f4c20b0a8a0f3c6 Mon Sep 17 00:00:00 2001
From: William Pitcock <nenolod@dereferenced.org>
Date: Mon, 4 Feb 2019 17:03:34 +0000
Subject: [PATCH] activitypub: mrf: tag policy: add support for processing
 follow requests

---
 lib/pleroma/web/activity_pub/mrf/tag_policy.ex | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/lib/pleroma/web/activity_pub/mrf/tag_policy.ex b/lib/pleroma/web/activity_pub/mrf/tag_policy.ex
index e05663371..2af36616f 100644
--- a/lib/pleroma/web/activity_pub/mrf/tag_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/tag_policy.ex
@@ -88,7 +88,20 @@ defp process_tag(
   defp process_tag(_, message), do: {:ok, message}
 
   @impl true
-  def filter(%{"actor" => actor} = message) do
+  def filter(%{"object" => target_actor, "type" => "Follow"} = message) do
+    User.get_cached_by_ap_id(target_actor)
+    |> get_tags()
+    |> Enum.reduce({:ok, message}, fn
+      tag, {:ok, message} ->
+        process_tag(tag, message)
+
+      _, error ->
+        error
+    end)
+  end
+
+  @impl true
+  def filter(%{"actor" => actor, "type" => "Create"} = message) do
     User.get_cached_by_ap_id(actor)
     |> get_tags()
     |> Enum.reduce({:ok, message}, fn
@@ -99,4 +112,7 @@ def filter(%{"actor" => actor} = message) do
         error
     end)
   end
+
+  @impl true
+  def filter(message), do: {:ok, message}
 end