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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.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
def get_object(%{"object" => id}) when is_binary(id) do
id
end
def get_object(%{"object" => %{"id" => id}}) when is_binary(id) do
id
end
def get_object(_) do
nil
end
defp compare_uris(%URI{host: host} = _id_uri, %URI{host: host} = _other_uri), do: :ok
defp compare_uris(_id_uri, _other_uri), do: :error
@doc """
Checks that an imported AP object's actor matches the host 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))
compare_uris(actor_uri, id_uri)
end
def contain_origin(id, %{"attributedTo" => actor} = params),
do: contain_origin(id, Map.put(params, "actor", actor))
def contain_origin(_id, _data), do: :error
def contain_origin_from_id(id, %{"id" => other_id} = _params) when is_binary(other_id) do
id_uri = URI.parse(id)
other_uri = URI.parse(other_id)
compare_uris(id_uri, other_uri)
end
# Mastodon pin activities don't have an id, so we check the object field, which will be pinned.
def contain_origin_from_id(id, %{"object" => object}) when is_binary(object) do
id_uri = URI.parse(id)
object_uri = URI.parse(object)
compare_uris(id_uri, object_uri)
end
def contain_origin_from_id(_id, _data), do: :error
def contain_child(%{"object" => %{"id" => id, "attributedTo" => _} = object}),
do: contain_origin(id, object)
def contain_child(_), do: :ok
end

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