Add short documentation on every MRF Policy

lib/pleroma/web/activity_pub/mrf/anti_followbot_policy.ex

@@ -5,6 +5,8 @@
 defmodule Pleroma.Web.ActivityPub.MRF.AntiFollowbotPolicy do
   alias Pleroma.User
 
+  @moduledoc "Prevent followbots from following with a bit of heuristic"
+
   @behaviour Pleroma.Web.ActivityPub.MRF
 
   # XXX: this should become User.normalize_by_ap_id() or similar, really.

lib/pleroma/web/activity_pub/mrf/drop_policy.ex

@@ -4,6 +4,7 @@
 
 defmodule Pleroma.Web.ActivityPub.MRF.DropPolicy do
   require Logger
+  @moduledoc "Drop and log everything received"
   @behaviour Pleroma.Web.ActivityPub.MRF
 
   @impl true

lib/pleroma/web/activity_pub/mrf/ensure_re_prepended.ex

@@ -5,6 +5,7 @@
 defmodule Pleroma.Web.ActivityPub.MRF.EnsureRePrepended do
   alias Pleroma.Object
 
+  @moduledoc "Ensure a re: is prepended on replies to a post with a Subject"
   @behaviour Pleroma.Web.ActivityPub.MRF
 
   @reply_prefix Regex.compile!("^re:[[:space:]]*", [:caseless])

lib/pleroma/web/activity_pub/mrf/hellthread_policy.ex

@@ -4,6 +4,8 @@
 
 defmodule Pleroma.Web.ActivityPub.MRF.HellthreadPolicy do
   alias Pleroma.User
+  @moduledoc "Block messages with too much mentions (configurable)"
+
   @behaviour Pleroma.Web.ActivityPub.MRF
 
   defp delist_message(message, threshold) when threshold > 0 do

lib/pleroma/web/activity_pub/mrf/keyword_policy.ex

@@ -3,6 +3,8 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicy do
+  @moduledoc "Reject or Word-Replace messages with a keyword or regex"
+
   @behaviour Pleroma.Web.ActivityPub.MRF
   defp string_matches?(string, _) when not is_binary(string) do
     false

lib/pleroma/web/activity_pub/mrf/no_placeholder_text_policy.ex

@@ -3,6 +3,7 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.ActivityPub.MRF.NoPlaceholderTextPolicy do
+  @moduledoc "Ensure no content placeholder is present (such as the dot from mastodon)"
   @behaviour Pleroma.Web.ActivityPub.MRF
 
   @impl true

lib/pleroma/web/activity_pub/mrf/noop_policy.ex

@@ -3,6 +3,7 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.ActivityPub.MRF.NoOpPolicy do
+  @moduledoc "Does nothing (lets the messages go through unmodified)"
   @behaviour Pleroma.Web.ActivityPub.MRF
 
   @impl true

lib/pleroma/web/activity_pub/mrf/normalize_markup.ex

@@ -3,6 +3,7 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.ActivityPub.MRF.NormalizeMarkup do
+  @moduledoc "Scrub configured hypertext markup"
   alias Pleroma.HTML
 
   @behaviour Pleroma.Web.ActivityPub.MRF

lib/pleroma/web/activity_pub/mrf/reject_non_public.ex

@@ -4,6 +4,7 @@
 
 defmodule Pleroma.Web.ActivityPub.MRF.RejectNonPublic do
   alias Pleroma.User
+  @moduledoc "Rejects non-public (followers-only, direct) activities"
   @behaviour Pleroma.Web.ActivityPub.MRF
 
   @impl true

lib/pleroma/web/activity_pub/mrf/simple_policy.ex

@@ -4,6 +4,7 @@
 
 defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
   alias Pleroma.User
+  @moduledoc "Filter activities depending on their origin instance"
   @behaviour Pleroma.Web.ActivityPub.MRF
 
   defp check_accept(%{host: actor_host} = _actor_info, object) do

lib/pleroma/web/activity_pub/mrf/tag_policy.ex

@@ -5,6 +5,7 @@
 defmodule Pleroma.Web.ActivityPub.MRF.TagPolicy do
   alias Pleroma.User
   @behaviour Pleroma.Web.ActivityPub.MRF
+  @moduledoc "Apply policies based on user tags"
 
   defp get_tags(%User{tags: tags}) when is_list(tags), do: tags
   defp get_tags(_), do: []

lib/pleroma/web/activity_pub/mrf/user_allowlist.ex

@@ -5,6 +5,7 @@
 defmodule Pleroma.Web.ActivityPub.MRF.UserAllowListPolicy do
   alias Pleroma.Config
 
+  @moduledoc "Accept-list of users from specified instances"
   @behaviour Pleroma.Web.ActivityPub.MRF
 
   defp filter_by_list(object, []), do: {:ok, object}