no_empty_policy.ex
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no_empty_policy.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.MRF.NoEmptyPolicy do
	@moduledoc "Filter local activities which have no content"
	@behaviour Pleroma.Web.ActivityPub.MRF.Policy

	alias Pleroma.Web.Endpoint

	@impl true
	def filter(%{"actor" => actor} = activity) do
	with true <- local?(actor),
	true <- eligible_type?(activity),
	true <- note?(activity),
	false <- has_attachment?(activity),
	true <- only_mentions?(activity) do
	{:reject, "[NoEmptyPolicy]"}
	else
	_ ->
	{:ok, activity}
	end
	end

	def filter(activity), do: {:ok, activity}

	defp local?(actor) do
	if actor \|> String.starts_with?("#{Endpoint.url()}") do
	true
	else
	false
	end
	end

	defp has_attachment?(%{
	"object" => %{"type" => "Note", "attachment" => attachments}
	})
	when length(attachments) > 0,
	do: true

	defp has_attachment?(_), do: false

	defp only_mentions?(%{"object" => %{"type" => "Note", "source" => source}}) do
	source =
	case source do
	%{"content" => text} -> text
	_ -> source
	end

	non_mentions =
	source \|> String.split() \|> Enum.filter(&(not String.starts_with?(&1, "@"))) \|> length

	if non_mentions > 0 do
	false
	else
	true
	end
	end

	defp only_mentions?(_), do: false

	defp note?(%{"object" => %{"type" => "Note"}}), do: true
	defp note?(_), do: false

	defp eligible_type?(%{"type" => type}) when type in ["Create", "Update"], do: true
	defp eligible_type?(_), do: false

	@impl true
	def describe, do: {:ok, %{}}
	end