Merge branch 'followers-only-reply-direct-mrf' into 'develop'

MRF.FODirectReply

See merge request pleroma/pleroma!4091

changelog.d/mrf-fodirectreply.add

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+Added MRF.FODirectReply which changes replies to followers-only posts to be direct

lib/pleroma/web/activity_pub/mrf/fo_direct_reply.ex

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2024 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.FODirectReply do
+  @moduledoc """
+  FODirectReply alters the scope of replies to activities which are Followers Only to be Direct. The purpose of this policy is to prevent broken threads for followers of the reply author because their response was to a user that they are not also following.
+  """
+
+  alias Pleroma.User
+
+  @behaviour Pleroma.Web.ActivityPub.MRF.Policy
+
+  @impl true
+  def filter(
+        %{
+          "type" => "Create",
+          "to" => to,
+          "object" => %{
+            "actor" => actor,
+            "type" => "Note",
+            "inReplyTo" => in_reply_to
+          }
+        } = activity
+      ) do
+    with true <- is_binary(in_reply_to),
+         %User{follower_address: followers_collection, local: true} <- User.get_by_ap_id(actor),
+         true <- followers_only?(in_reply_to) do
+      direct_to = to -- [followers_collection]
+
+      updated_activity =
+        activity
+        |> Map.put("cc", [])
+        |> Map.put("to", direct_to)
+        |> Map.put("directMessage", true)
+        |> put_in(["object", "cc"], [])
+        |> put_in(["object", "to"], direct_to)
+
+      {:ok, updated_activity}
+    else
+      _ -> {:ok, activity}
+    end
+  end
+
+  @impl true
+  def filter(activity), do: {:ok, activity}
+
+  @impl true
+  def describe, do: {:ok, %{}}
+
+  defp followers_only?(parent_ap_id) do
+    with %Pleroma.Object{} = object <- Pleroma.Object.get_by_ap_id(parent_ap_id),
+         object_data <- Map.get(object, :data),
+         %Pleroma.User{} = user <- User.get_cached_by_ap_id(object_data["actor"]) do
+      if user.follower_address in object_data["to"] do
+        true
+      else
+        false
+      end
+    else
+      _ ->
+        false
+    end
+  end
+end

test/pleroma/web/activity_pub/mrf/fo_direct_reply_test.exs

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.FODirectReplyTest do
+  use Pleroma.DataCase
+  import Pleroma.Factory
+
+  require Pleroma.Constants
+
+  alias Pleroma.Object
+  alias Pleroma.Web.ActivityPub.MRF.FODirectReply
+  alias Pleroma.Web.CommonAPI
+
+  test "replying to followers-only/private is changed to direct" do
+    batman = insert(:user, nickname: "batman")
+    robin = insert(:user, nickname: "robin")
+
+    {:ok, post} =
+      CommonAPI.post(batman, %{
+        status: "Has anyone seen Selina Kyle's latest selfies?",
+        visibility: "private"
+      })
+
+    reply = %{
+      "type" => "Create",
+      "actor" => robin.ap_id,
+      "to" => [batman.ap_id, robin.follower_address],
+      "cc" => [],
+      "object" => %{
+        "type" => "Note",
+        "actor" => robin.ap_id,
+        "content" => "@batman 🤤 ❤️ 🐈‍⬛",
+        "to" => [batman.ap_id, robin.follower_address],
+        "cc" => [],
+        "inReplyTo" => Object.normalize(post).data["id"]
+      }
+    }
+
+    expected_to = [batman.ap_id]
+    expected_cc = []
+
+    assert {:ok, filtered} = FODirectReply.filter(reply)
+
+    assert expected_to == filtered["to"]
+    assert expected_cc == filtered["cc"]
+    assert expected_to == filtered["object"]["to"]
+    assert expected_cc == filtered["object"]["cc"]
+  end
+
+  test "replies to public posts are unmodified" do
+    batman = insert(:user, nickname: "batman")
+    robin = insert(:user, nickname: "robin")
+
+    {:ok, post} =
+      CommonAPI.post(batman, %{status: "Has anyone seen Selina Kyle's latest selfies?"})
+
+    reply = %{
+      "type" => "Create",
+      "actor" => robin.ap_id,
+      "to" => [batman.ap_id, robin.follower_address],
+      "cc" => [],
+      "object" => %{
+        "type" => "Note",
+        "actor" => robin.ap_id,
+        "content" => "@batman 🤤 ❤️ 🐈<200d>⬛",
+        "to" => [batman.ap_id, robin.follower_address],
+        "cc" => [],
+        "inReplyTo" => Object.normalize(post).data["id"]
+      }
+    }
+
+    assert {:ok, filtered} = FODirectReply.filter(reply)
+
+    assert match?(^filtered, reply)
+  end
+
+  test "non-reply posts are unmodified" do
+    batman = insert(:user, nickname: "batman")
+
+    {:ok, post} = CommonAPI.post(batman, %{status: "To the Batmobile!"})
+
+    assert {:ok, filtered} = FODirectReply.filter(post)
+
+    assert match?(^filtered, post)
+  end
+end