From d24ddd9fb9fb5254b2e80cbe70ba9bc83f2cd0da Mon Sep 17 00:00:00 2001 From: William Pitcock Date: Sat, 14 Apr 2018 11:31:12 +0000 Subject: [PATCH] ActivityPub MRF: implement the SimplePolicy policy --- config/config.exs | 6 ++ .../web/activity_pub/mrf/simple_policy.ex | 65 +++++++++++++++++++ 2 files changed, 71 insertions(+) create mode 100644 lib/pleroma/web/activity_pub/mrf/simple_policy.ex diff --git a/config/config.exs b/config/config.exs index 660ba1775..b0f4578d5 100644 --- a/config/config.exs +++ b/config/config.exs @@ -55,6 +55,12 @@ federating: true, rewrite_policy: Pleroma.Web.ActivityPub.MRF.NoOpPolicy +config :pleroma, :mrf_simple, + media_removal: [], + media_nsfw: [], + federated_timeline_removal: [], + reject: [] + config :pleroma, :media_proxy, enabled: false, redirect_on_failure: true diff --git a/lib/pleroma/web/activity_pub/mrf/simple_policy.ex b/lib/pleroma/web/activity_pub/mrf/simple_policy.ex new file mode 100644 index 000000000..1322744f1 --- /dev/null +++ b/lib/pleroma/web/activity_pub/mrf/simple_policy.ex @@ -0,0 +1,65 @@ +defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do + alias Pleroma.User + + @mrf_policy Application.get_env(:pleroma, :mrf_simple) + + @reject Keyword.get(@mrf_policy, :reject) + defp check_reject(actor_info, object) do + if actor_info.host in @reject do + {:reject, nil} + else + {:ok, object} + end + end + + @media_removal Keyword.get(@mrf_policy, :media_removal) + defp check_media_removal(actor_info, object) do + if actor_info.host in @media_removal do + object = Map.delete(object, "attachments") + end + + {:ok, object} + end + + @media_nsfw Keyword.get(@mrf_policy, :media_nsfw) + defp check_media_nsfw(actor_info, object) do + if actor_info.host in @media_nsfw and object["attachment"] != nil and length(object["attachment"]) > 0 do + tags = (object["tag"] || []) ++ ["nsfw"] + object = Map.put(object, "tags", tags) + object = Map.put(object, "sensitive", true) + end + + {:ok, object} + end + + @ftl_removal Keyword.get(@mrf_policy, :federated_timeline_removal) + defp check_ftl_removal(actor_info, object) do + if actor_info.host in @ftl_removal do + user = User.get_by_ap_id(object["actor"]) + + # flip to/cc relationship to make the post unlisted + if "https://www.w3.org/ns/activitystreams#Public" in object["to"] and user.follower_address in object["cc"] do + to = List.delete(object["to"], "https://www.w3.org/ns/activitystreams#Public") ++ [user.follower_address] + cc = List.delete(object["cc"], user.follower_address) ++ ["https://www.w3.org/ns/activitystreams#Public"] + + object = Map.put(object, "to", to) + object = Map.put(object, "cc", cc) + end + end + + {:ok, object} + end + + def filter(object) do + actor_info = URI.parse(object["actor"]) + + with {:ok, object} <- check_reject(actor_info, object), + {:ok, object} <- check_media_removal(actor_info, object), + {:ok, object} <- check_media_nsfw(actor_info, object), + {:ok, object} <- check_ftl_removal(actor_info, object) do + {:ok, object} + else + e -> {:reject, nil} + end + end +end