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diff --git a/lib/pleroma/web/activity_pub/object_validators/common_fixes.ex b/lib/pleroma/web/activity_pub/object_validators/common_fixes.ex
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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.ObjectValidators.CommonFixes do
+  alias Pleroma.EctoType.ActivityPub.ObjectValidators
+  alias Pleroma.Object
+  alias Pleroma.Object.Containment
+  alias Pleroma.User
+  alias Pleroma.Web.ActivityPub.Transmogrifier
+  alias Pleroma.Web.ActivityPub.Utils
+
+  def cast_and_filter_recipients(message, field, follower_collection, field_fallback \\ []) do
+    {:ok, data} = ObjectValidators.Recipients.cast(message[field] || field_fallback)
+
+    data =
+      Enum.reject(data, fn x ->
+        String.ends_with?(x, "/followers") and x != follower_collection
+      end)
+
+    Map.put(message, field, data)
+  end
+
+  def fix_object_defaults(data) do
+    context =
+      Utils.maybe_create_context(
+        data["context"] || data["conversation"] || data["inReplyTo"] || data["id"]
+      )
+
+    %User{follower_address: follower_collection} = User.get_cached_by_ap_id(data["attributedTo"])
+
+    data
+    |> Map.put("context", context)
+    |> cast_and_filter_recipients("to", follower_collection)
+    |> cast_and_filter_recipients("cc", follower_collection)
+    |> cast_and_filter_recipients("bto", follower_collection)
+    |> cast_and_filter_recipients("bcc", follower_collection)
+    |> Transmogrifier.fix_implicit_addressing(follower_collection)
+  end
+
+  def fix_activity_addressing(activity) do
+    %User{follower_address: follower_collection} = User.get_cached_by_ap_id(activity["actor"])
+
+    activity
+    |> cast_and_filter_recipients("to", follower_collection)
+    |> cast_and_filter_recipients("cc", follower_collection)
+    |> cast_and_filter_recipients("bto", follower_collection)
+    |> cast_and_filter_recipients("bcc", follower_collection)
+    |> Transmogrifier.fix_implicit_addressing(follower_collection)
+  end
+
+  def fix_actor(data) do
+    actor =
+      data
+      |> Map.put_new("actor", data["attributedTo"])
+      |> Containment.get_actor()
+
+    data
+    |> Map.put("actor", actor)
+    |> Map.put("attributedTo", actor)
+  end
+
+  def fix_activity_context(data, %Object{data: %{"context" => object_context}}) do
+    data
+    |> Map.put("context", object_context)
+  end
+
+  def fix_object_action_recipients(%{"actor" => actor} = data, %Object{data: %{"actor" => actor}}) do
+    to = ((data["to"] || []) -- [actor]) |> Enum.uniq()
+
+    Map.put(data, "to", to)
+  end
+
+  def fix_object_action_recipients(data, %Object{data: %{"actor" => actor}}) do
+    to = ((data["to"] || []) ++ [actor]) |> Enum.uniq()
+
+    Map.put(data, "to", to)
+  end
+end