anti_link_spam_policy.ex
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anti_link_spam_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.AntiLinkSpamPolicy do
	alias Pleroma.User

	@behaviour Pleroma.Web.ActivityPub.MRF.Policy

	require Logger

	@impl true
	def history_awareness, do: :auto

	# has the user successfully posted before?
	defp old_user?(%User{} = u) do
	u.note_count > 0 \|\| u.follower_count > 0
	end

	# does the post contain links?
	defp contains_links?(%{"content" => content} = _object) do
	content
	\|> Floki.parse_fragment!()
	\|> Floki.filter_out("a.mention,a.hashtag,a[rel~=\"tag\"],a.zrl")
	\|> Floki.attribute("a", "href")
	\|> length() > 0
	end

	defp contains_links?(_), do: false

	@impl true
	def filter(%{"type" => "Create", "actor" => actor, "object" => object} = activity) do
	with {:ok, %User{local: false} = u} <- User.get_or_fetch_by_ap_id(actor),
	{:contains_links, true} <- {:contains_links, contains_links?(object)},
	{:old_user, true} <- {:old_user, old_user?(u)} do
	{:ok, activity}
	else
	{:ok, %User{local: true}} ->
	{:ok, activity}

	{:contains_links, false} ->
	{:ok, activity}

	{:old_user, false} ->
	{:reject, "[AntiLinkSpamPolicy] User has no posts nor followers"}

	{:error, _} ->
	{:reject, "[AntiLinkSpamPolicy] Failed to get or fetch user by ap_id"}

	e ->
	{:reject, "[AntiLinkSpamPolicy] Unhandled error #{inspect(e)}"}
	end
	end

	# in all other cases, pass through
	def filter(activity), do: {:ok, activity}

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