1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
5 defmodule Pleroma.Repo.Migrations.AddThreadVisibilityFunction do
7 @disable_ddl_transaction true
11 CREATE OR REPLACE FUNCTION thread_visibility(actor varchar, activity_id varchar) RETURNS boolean AS $$
13 public varchar := 'https://www.w3.org/ns/activitystreams#Public';
14 child objects%ROWTYPE;
15 activity activities%ROWTYPE;
16 actor_user users%ROWTYPE;
18 valid_recipients varchar[];
21 SELECT * INTO actor_user FROM users WHERE users.ap_id = actor;
23 --- Fetch our initial activity.
24 SELECT * INTO activity FROM activities WHERE activities.data->>'id' = activity_id;
27 --- Ensure that we have an activity before continuing.
28 --- If we don't, the thread is not satisfiable.
29 IF activity IS NULL THEN
33 --- We only care about Create activities.
34 IF activity.data->>'type' != 'Create' THEN
38 --- Normalize the child object into child.
39 SELECT * INTO child FROM objects
40 INNER JOIN activities ON COALESCE(activities.data->'object'->>'id', activities.data->>'object') = objects.data->>'id'
41 WHERE COALESCE(activity.data->'object'->>'id', activity.data->>'object') = objects.data->>'id';
43 --- Fetch the author's AS2 following collection.
44 SELECT COALESCE(users.follower_address, '') INTO author_fa FROM users WHERE users.ap_id = activity.actor;
46 --- Prepare valid recipients array.
47 valid_recipients := ARRAY[actor, public];
48 IF ARRAY[author_fa] && actor_user.following THEN
49 valid_recipients := valid_recipients || author_fa;
53 IF NOT valid_recipients && activity.recipients THEN
54 --- activity not visible, break out of the loop
58 --- If there's a parent, load it and do this all over again.
59 IF (child.data->'inReplyTo' IS NOT NULL) AND (child.data->'inReplyTo' != 'null'::jsonb) THEN
60 SELECT * INTO activity FROM activities
61 INNER JOIN objects ON COALESCE(activities.data->'object'->>'id', activities.data->>'object') = objects.data->>'id'
62 WHERE child.data->>'inReplyTo' = objects.data->>'id';
68 $$ LANGUAGE plpgsql IMMUTABLE;
75 execute("drop function if exists thread_visibility(actor varchar, activity_id varchar)")