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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
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