From 370e313e2df19e4579c154388336dd5e09bff7bf Mon Sep 17 00:00:00 2001
From: Mark Felder <feld@FreeBSD.org>
Date: Sat, 2 May 2020 13:28:10 -0500
Subject: [PATCH 1/2] Only update follower/following stats for actor types of
 users and bots.

---
 lib/pleroma/web/activity_pub/activity_pub.ex | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index 1f4a09370..31304c340 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -1532,9 +1532,14 @@ defp normalize_counter(_), do: 0
 
   defp maybe_update_follow_information(data) do
     with {:enabled, true} <- {:enabled, Config.get([:instance, :external_user_synchronization])},
-         {:ok, info} <- fetch_follow_information_for_user(data) do
+         {:ok, info} <- fetch_follow_information_for_user(data),
+         {:ok, actor_type} <- Map.fetch(data, :actor_type) do
       info = Map.merge(data[:info] || %{}, info)
-      Map.put(data, :info, info)
+
+      cond do
+        actor_type in ["Person", "Service"] -> Map.put(data, :info, info)
+        true -> data
+      end
     else
       {:enabled, false} ->
         data

From ec24c70db80665aaaf4d7794ea62e9f9e6676bec Mon Sep 17 00:00:00 2001
From: lain <lain@soykaf.club>
Date: Mon, 4 May 2020 14:22:54 +0200
Subject: [PATCH 2/2] ActivityPub: Don't fetch `Application` follower counts.

---
 lib/pleroma/web/activity_pub/activity_pub.ex | 30 +++++++-----
 test/web/activity_pub/activity_pub_test.exs  | 50 +++++++++++++++++++-
 2 files changed, 68 insertions(+), 12 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index 31304c340..1c21d78af 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -1530,26 +1530,34 @@ def fetch_follow_information_for_user(user) do
   defp normalize_counter(counter) when is_integer(counter), do: counter
   defp normalize_counter(_), do: 0
 
-  defp maybe_update_follow_information(data) do
+  def maybe_update_follow_information(user_data) do
     with {:enabled, true} <- {:enabled, Config.get([:instance, :external_user_synchronization])},
-         {:ok, info} <- fetch_follow_information_for_user(data),
-         {:ok, actor_type} <- Map.fetch(data, :actor_type) do
-      info = Map.merge(data[:info] || %{}, info)
+         {_, true} <- {:user_type_check, user_data[:type] in ["Person", "Service"]},
+         {_, true} <-
+           {:collections_available,
+            !!(user_data[:following_address] && user_data[:follower_address])},
+         {:ok, info} <-
+           fetch_follow_information_for_user(user_data) do
+      info = Map.merge(user_data[:info] || %{}, info)
 
-      cond do
-        actor_type in ["Person", "Service"] -> Map.put(data, :info, info)
-        true -> data
-      end
+      user_data
+      |> Map.put(:info, info)
     else
+      {:user_type_check, false} ->
+        user_data
+
+      {:collections_available, false} ->
+        user_data
+
       {:enabled, false} ->
-        data
+        user_data
 
       e ->
         Logger.error(
-          "Follower/Following counter update for #{data.ap_id} failed.\n" <> inspect(e)
+          "Follower/Following counter update for #{user_data.ap_id} failed.\n" <> inspect(e)
         )
 
-        data
+        user_data
     end
   end
 
diff --git a/test/web/activity_pub/activity_pub_test.exs b/test/web/activity_pub/activity_pub_test.exs
index edd7dfb22..84ead93bb 100644
--- a/test/web/activity_pub/activity_pub_test.exs
+++ b/test/web/activity_pub/activity_pub_test.exs
@@ -18,9 +18,10 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubTest do
   alias Pleroma.Web.CommonAPI
   alias Pleroma.Web.Federator
 
+  import ExUnit.CaptureLog
+  import Mock
   import Pleroma.Factory
   import Tesla.Mock
-  import Mock
 
   setup do
     mock(fn env -> apply(HttpRequestMock, :request, [env]) end)
@@ -2403,4 +2404,51 @@ defp private_messages(_) do
      u3: %{r1: r3_1.id, r2: r3_2.id},
      u4: %{r1: r4_1.id}}
   end
+
+  describe "maybe_update_follow_information/1" do
+    setup do
+      clear_config([:instance, :external_user_synchronization], true)
+
+      user = %{
+        local: false,
+        ap_id: "https://gensokyo.2hu/users/raymoo",
+        following_address: "https://gensokyo.2hu/users/following",
+        follower_address: "https://gensokyo.2hu/users/followers",
+        type: "Person"
+      }
+
+      %{user: user}
+    end
+
+    test "logs an error when it can't fetch the info", %{user: user} do
+      assert capture_log(fn ->
+               ActivityPub.maybe_update_follow_information(user)
+             end) =~ "Follower/Following counter update for #{user.ap_id} failed"
+    end
+
+    test "just returns the input if the user type is Application", %{
+      user: user
+    } do
+      user =
+        user
+        |> Map.put(:type, "Application")
+
+      refute capture_log(fn ->
+               assert ^user = ActivityPub.maybe_update_follow_information(user)
+             end) =~ "Follower/Following counter update for #{user.ap_id} failed"
+    end
+
+    test "it just returns the input if the user has no following/follower addresses", %{
+      user: user
+    } do
+      user =
+        user
+        |> Map.put(:following_address, nil)
+        |> Map.put(:follower_address, nil)
+
+      refute capture_log(fn ->
+               assert ^user = ActivityPub.maybe_update_follow_information(user)
+             end) =~ "Follower/Following counter update for #{user.ap_id} failed"
+    end
+  end
 end