From 8f98d970c105bec3205c6ce524750583ad5fb502 Mon Sep 17 00:00:00 2001
From: rinpatch <rinpatch@sdf.org>
Date: Sun, 17 Feb 2019 13:46:40 +0300
Subject: [PATCH 1/2] Fix recipient count in hellthread policy

---
 lib/pleroma/web/activity_pub/mrf/hellthread_policy.ex | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/mrf/hellthread_policy.ex b/lib/pleroma/web/activity_pub/mrf/hellthread_policy.ex
index 8ab1dd4e5..6736f3cb9 100644
--- a/lib/pleroma/web/activity_pub/mrf/hellthread_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/hellthread_policy.ex
@@ -12,14 +12,14 @@ defp delist_message(message, threshold) when threshold > 0 do
     follower_collection? = Enum.member?(message["to"] ++ message["cc"], follower_collection)
 
     message =
-      case recipients = get_recipient_count(message) do
-        {:public, _}
+      case get_recipient_count(message) do
+        {:public, recipients}
         when follower_collection? and recipients > threshold ->
           message
           |> Map.put("to", [follower_collection])
           |> Map.put("cc", ["https://www.w3.org/ns/activitystreams#Public"])
 
-        {:public, _} when recipients > threshold ->
+        {:public, recipients} when recipients > threshold ->
           message
           |> Map.put("to", [])
           |> Map.put("cc", ["https://www.w3.org/ns/activitystreams#Public"])

From d0a94f98e030dd700c56e8cc4576fb45cf449f53 Mon Sep 17 00:00:00 2001
From: rinpatch <rinpatch@sdf.org>
Date: Sun, 17 Feb 2019 14:33:44 +0300
Subject: [PATCH 2/2] more tests for HellthreadPolicy

---
 .../mrf/hellthread_policy_test.exs            | 65 +++++++++++++------
 1 file changed, 44 insertions(+), 21 deletions(-)

diff --git a/test/web/activity_pub/mrf/hellthread_policy_test.exs b/test/web/activity_pub/mrf/hellthread_policy_test.exs
index ebf9997cd..eb6ee4d04 100644
--- a/test/web/activity_pub/mrf/hellthread_policy_test.exs
+++ b/test/web/activity_pub/mrf/hellthread_policy_test.exs
@@ -8,32 +8,47 @@ defmodule Pleroma.Web.ActivityPub.MRF.HellthreadPolicyTest do
 
   import Pleroma.Web.ActivityPub.MRF.HellthreadPolicy
 
-  describe "hellthread filter tests" do
-    setup do
-      user = insert(:user)
+  setup do
+    user = insert(:user)
 
-      message = %{
-        "actor" => user.ap_id,
-        "cc" => [user.follower_address],
-        "type" => "Create",
-        "to" => [
-          "https://www.w3.org/ns/activitystreams#Public",
-          "https://instace.tld/users/user1",
-          "https://instace.tld/users/user2",
-          "https://instace.tld/users/user3"
-        ]
-      }
+    message = %{
+      "actor" => user.ap_id,
+      "cc" => [user.follower_address],
+      "type" => "Create",
+      "to" => [
+        "https://www.w3.org/ns/activitystreams#Public",
+        "https://instance.tld/users/user1",
+        "https://instance.tld/users/user2",
+        "https://instance.tld/users/user3"
+      ]
+    }
 
-      [user: user, message: message]
-    end
+    [user: user, message: message]
+  end
 
-    test "reject test", %{message: message} do
+  describe "reject" do
+    test "rejects the message if the recipient count is above reject_threshold", %{
+      message: message
+    } do
       Pleroma.Config.put([:mrf_hellthread], %{delist_threshold: 0, reject_threshold: 2})
 
       {:reject, nil} = filter(message)
     end
 
-    test "delist test", %{user: user, message: message} do
+    test "does not reject the message if the recipient count is below reject_threshold", %{
+      message: message
+    } do
+      Pleroma.Config.put([:mrf_hellthread], %{delist_threshold: 0, reject_threshold: 3})
+
+      assert {:ok, ^message} = filter(message)
+    end
+  end
+
+  describe "delist" do
+    test "delists the message if the recipient count is above delist_threshold", %{
+      user: user,
+      message: message
+    } do
       Pleroma.Config.put([:mrf_hellthread], %{delist_threshold: 2, reject_threshold: 0})
 
       {:ok, message} = filter(message)
@@ -41,10 +56,18 @@ test "delist test", %{user: user, message: message} do
       assert "https://www.w3.org/ns/activitystreams#Public" in message["cc"]
     end
 
-    test "excludes follower collection and public URI from threshold count", %{message: message} do
-      Pleroma.Config.put([:mrf_hellthread], %{delist_threshold: 0, reject_threshold: 3})
+    test "does not delist the message if the recipient count is below delist_threshold", %{
+      message: message
+    } do
+      Pleroma.Config.put([:mrf_hellthread], %{delist_threshold: 4, reject_threshold: 0})
 
-      {:ok, _} = filter(message)
+      assert {:ok, ^message} = filter(message)
     end
   end
+
+  test "excludes follower collection and public URI from threshold count", %{message: message} do
+    Pleroma.Config.put([:mrf_hellthread], %{delist_threshold: 0, reject_threshold: 3})
+
+    assert {:ok, ^message} = filter(message)
+  end
 end