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diff --git a/lib/pleroma/object/containment.ex b/lib/pleroma/object/containment.ex
index 2f4687fa2..ada9da0bb 100644
--- a/lib/pleroma/object/containment.ex
+++ b/lib/pleroma/object/containment.ex
@@ -1,59 +1,63 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
defmodule Pleroma.Object.Containment do
@moduledoc """
This module contains some useful functions for containing objects to specific
origins and determining those origins. They previously lived in the
ActivityPub `Transmogrifier` module.
Object containment is an important step in validating remote objects to prevent
spoofing, therefore removal of object containment functions is NOT recommended.
"""
def get_actor(%{"actor" => actor}) when is_binary(actor) do
actor
end
def get_actor(%{"actor" => actor}) when is_list(actor) do
if is_binary(Enum.at(actor, 0)) do
Enum.at(actor, 0)
else
Enum.find(actor, fn %{"type" => type} -> type in ["Person", "Service", "Application"] end)
|> Map.get("id")
end
end
def get_actor(%{"actor" => %{"id" => id}}) when is_bitstring(id) do
id
end
def get_actor(%{"actor" => nil, "attributedTo" => actor}) when not is_nil(actor) do
get_actor(%{"actor" => actor})
end
@doc """
Checks that an imported AP object's actor matches the domain it came from.
"""
def contain_origin(_id, %{"actor" => nil}), do: :error
def contain_origin(id, %{"actor" => _actor} = params) do
id_uri = URI.parse(id)
actor_uri = URI.parse(get_actor(params))
if id_uri.host == actor_uri.host do
:ok
else
:error
end
end
def contain_origin_from_id(_id, %{"id" => nil}), do: :error
def contain_origin_from_id(id, %{"id" => other_id} = _params) do
id_uri = URI.parse(id)
other_uri = URI.parse(other_id)
if id_uri.host == other_uri.host do
:ok
else
:error
end
end
end

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