From 0d05e1fe397d75d4381d9059bd1c049ab7030085 Mon Sep 17 00:00:00 2001
From: Ivan Tashkinov <ivantashkinov@gmail.com>
Date: Sat, 25 Apr 2020 18:24:10 +0300
Subject: [PATCH] [#1706] Prevented error on unresolved activity actors for
 timeline actions.

---
 lib/pleroma/web/admin_api/views/status_view.ex | 18 +++---------------
 .../web/mastodon_api/views/status_view.ex      | 13 ++++++++++---
 2 files changed, 13 insertions(+), 18 deletions(-)

diff --git a/lib/pleroma/web/admin_api/views/status_view.ex b/lib/pleroma/web/admin_api/views/status_view.ex
index 360ddc22c..3637dee24 100644
--- a/lib/pleroma/web/admin_api/views/status_view.ex
+++ b/lib/pleroma/web/admin_api/views/status_view.ex
@@ -8,15 +8,16 @@ defmodule Pleroma.Web.AdminAPI.StatusView do
   require Pleroma.Constants
 
   alias Pleroma.User
+  alias Pleroma.Web.MastodonAPI.StatusView
 
   def render("index.json", opts) do
     safe_render_many(opts.activities, __MODULE__, "show.json", opts)
   end
 
   def render("show.json", %{activity: %{data: %{"object" => _object}} = activity} = opts) do
-    user = get_user(activity.data["actor"])
+    user = StatusView.get_user(activity.data["actor"])
 
-    Pleroma.Web.MastodonAPI.StatusView.render("show.json", opts)
+    StatusView.render("show.json", opts)
     |> Map.merge(%{account: merge_account_views(user)})
   end
 
@@ -26,17 +27,4 @@ defmodule Pleroma.Web.AdminAPI.StatusView do
   end
 
   defp merge_account_views(_), do: %{}
-
-  defp get_user(ap_id) do
-    cond do
-      user = User.get_cached_by_ap_id(ap_id) ->
-        user
-
-      user = User.get_by_guessed_nickname(ap_id) ->
-        user
-
-      true ->
-        User.error_user(ap_id)
-    end
-  end
 end
diff --git a/lib/pleroma/web/mastodon_api/views/status_view.ex b/lib/pleroma/web/mastodon_api/views/status_view.ex
index b5850e1ae..b0c53acd9 100644
--- a/lib/pleroma/web/mastodon_api/views/status_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/status_view.ex
@@ -45,7 +45,7 @@ defmodule Pleroma.Web.MastodonAPI.StatusView do
     end)
   end
 
-  defp get_user(ap_id) do
+  def get_user(ap_id, fake_record_fallback \\ true) do
     cond do
       user = User.get_cached_by_ap_id(ap_id) ->
         user
@@ -53,8 +53,11 @@ defmodule Pleroma.Web.MastodonAPI.StatusView do
       user = User.get_by_guessed_nickname(ap_id) ->
         user
 
-      true ->
+      fake_record_fallback ->
+        # TODO: refactor (fake records is never a good idea)
         User.error_user(ap_id)
+
+      true -> nil
     end
   end
 
@@ -97,7 +100,11 @@ defmodule Pleroma.Web.MastodonAPI.StatusView do
           UserRelationship.view_relationships_option(nil, [])
 
         true ->
-          actors = Enum.map(activities ++ parent_activities, &get_user(&1.data["actor"]))
+          # Note: unresolved users are filtered out
+          actors =
+            (activities ++ parent_activities)
+            |> Enum.map(&get_user(&1.data["actor"], false))
+            |> Enum.filter(& &1)
 
           UserRelationship.view_relationships_option(reading_user, actors,
             source_mutes_only: opts[:skip_relationships]