From eaa5343b2b227981221592b574c8fcbbcd847d64 Mon Sep 17 00:00:00 2001
From: Mint <>
Date: Sat, 3 Dec 2022 22:38:12 +0300
Subject: [PATCH] MRF to convert all non-direct posts to public scope

---
 .../mrf/convert_non_direct_to_public.ex       | 63 +++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 lib/pleroma/web/activity_pub/mrf/convert_non_direct_to_public.ex

diff --git a/lib/pleroma/web/activity_pub/mrf/convert_non_direct_to_public.ex b/lib/pleroma/web/activity_pub/mrf/convert_non_direct_to_public.ex
new file mode 100644
index 000000000..46fe20cd0
--- /dev/null
+++ b/lib/pleroma/web/activity_pub/mrf/convert_non_direct_to_public.ex
@@ -0,0 +1,63 @@
+# 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.ConvertNonDirectToPublic do
+  alias Pleroma.Config
+  alias Pleroma.User
+
+  @behaviour Pleroma.Web.ActivityPub.MRF.Policy
+
+  require Pleroma.Constants
+
+  @impl true
+  def filter(
+        %{
+          "type" => "Create",
+          "to" => to,
+          "cc" => cc,
+          "actor" => actor,
+          "object" => object
+        } = message
+      ) do
+    actor_info = URI.parse(actor)
+    user = User.get_cached_by_ap_id(actor)
+    instance_domain = Config.get([Pleroma.Web.Endpoint, :url, :host])
+
+    # Determine visibility
+    visibility =
+      cond do
+        Pleroma.Constants.as_public() in to -> "public"
+        Pleroma.Constants.as_public() in cc -> "unlisted"
+        user.follower_address in to -> "followers"
+        true -> "direct"
+      end
+
+    if visibility in ["unlisted", "followers"] and actor_info.host != instance_domain do
+      to = List.delete(to, user.follower_address) ++ [Pleroma.Constants.as_public()]
+      cc = List.delete(cc, Pleroma.Constants.as_public()) ++ [user.follower_address]
+
+      object =
+        object
+        |> Map.put("to", to)
+        |> Map.put("cc", cc)
+
+      message =
+        message
+        |> Map.put("to", to)
+        |> Map.put("cc", cc)
+        |> Map.put("object", object)
+
+      {:ok, message}
+    else
+      {:ok, message}
+    end
+
+  end
+
+  @impl true
+  def filter(message), do: {:ok, message}
+
+  @impl true
+  def describe, do: {:ok, %{}}
+end