From 94cbbb0e3a047c1d2851e2214b408dc19f569fbd Mon Sep 17 00:00:00 2001
From: William Pitcock <nenolod@dereferenced.org>
Date: Thu, 14 Feb 2019 00:27:35 +0000
Subject: [PATCH] activitypub: transmogrifier: do not attempt to expand
 pre-existing AS2 tag objects

---
 lib/pleroma/web/activity_pub/transmogrifier.ex | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex
index 98a2af819..5da65fa39 100644
--- a/lib/pleroma/web/activity_pub/transmogrifier.ex
+++ b/lib/pleroma/web/activity_pub/transmogrifier.ex
@@ -765,12 +765,18 @@ def maybe_fix_object_url(data) do
   def add_hashtags(object) do
     tags =
       (object["tag"] || [])
-      |> Enum.map(fn tag ->
-        %{
-          "href" => Pleroma.Web.Endpoint.url() <> "/tags/#{tag}",
-          "name" => "##{tag}",
-          "type" => "Hashtag"
-        }
+      |> Enum.map(fn
+        # Expand internal representation tags into AS2 tags.
+        tag when is_binary(tag) ->
+          %{
+            "href" => Pleroma.Web.Endpoint.url() <> "/tags/#{tag}",
+            "name" => "##{tag}",
+            "type" => "Hashtag"
+          }
+
+        # Do not process tags which are already AS2 tag objects.
+        tag when is_map(tag) ->
+          tag
       end)
 
     object