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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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+++ b/lib/pleroma/web/activity_pub/object_validators/common_fixes.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes do
+  alias Pleroma.Web.ActivityPub.Utils
+
+  # based on Pleroma.Web.ActivityPub.Utils.lazy_put_objects_defaults
+  def fix_defaults(data) do
+    %{data: %{"id" => context}, id: context_id} =
+      Utils.create_context(data["context"] || data["conversation"])
+
+    data
+    |> Map.put_new("context", context)
+    |> Map.put_new("context_id", context_id)
+  end
+
+  def fix_attribution(data) do
+    data
+    |> Map.put_new("actor", data["attributedTo"])
+  end
+end