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# Pleroma: A lightweight social networking server
# Copyright © 2017-2023 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Repo.Migrations.CreateFollowingRelationships do
use Ecto.Migration
def change do
create_if_not_exists table(:following_relationships) do
add(:follower_id, references(:users, type: :uuid, on_delete: :delete_all), null: false)
add(:following_id, references(:users, type: :uuid, on_delete: :delete_all), null: false)
add(:state, :string, null: false)
timestamps()
end
create_if_not_exists(index(:following_relationships, :follower_id))
create_if_not_exists(unique_index(:following_relationships, [:follower_id, :following_id]))
execute(update_thread_visibility(), restore_thread_visibility())
end
# The only difference between the original version: `actor_user` replaced with `actor_user_following`
def update_thread_visibility do
"""
CREATE OR REPLACE FUNCTION thread_visibility(actor varchar, activity_id varchar) RETURNS boolean AS $$
DECLARE
public varchar := 'https://www.w3.org/ns/activitystreams#Public';
child objects%ROWTYPE;
activity activities%ROWTYPE;
author_fa varchar;
valid_recipients varchar[];
actor_user_following varchar[];
BEGIN
--- Fetch actor following
SELECT array_agg(following.follower_address) INTO actor_user_following FROM following_relationships
JOIN users ON users.id = following_relationships.follower_id
JOIN users AS following ON following.id = following_relationships.following_id
WHERE users.ap_id = actor;
--- Fetch our initial activity.
SELECT * INTO activity FROM activities WHERE activities.data->>'id' = activity_id;
LOOP
--- Ensure that we have an activity before continuing.
--- If we don't, the thread is not satisfiable.
IF activity IS NULL THEN
RETURN false;
END IF;
--- We only care about Create activities.
IF activity.data->>'type' != 'Create' THEN
RETURN true;
END IF;
--- Normalize the child object into child.
SELECT * INTO child FROM objects
INNER JOIN activities ON COALESCE(activities.data->'object'->>'id', activities.data->>'object') = objects.data->>'id'
WHERE COALESCE(activity.data->'object'->>'id', activity.data->>'object') = objects.data->>'id';
--- Fetch the author's AS2 following collection.
SELECT COALESCE(users.follower_address, '') INTO author_fa FROM users WHERE users.ap_id = activity.actor;
--- Prepare valid recipients array.
valid_recipients := ARRAY[actor, public];
IF ARRAY[author_fa] && actor_user_following THEN
valid_recipients := valid_recipients || author_fa;
END IF;
--- Check visibility.
IF NOT valid_recipients && activity.recipients THEN
--- activity not visible, break out of the loop
RETURN false;
END IF;
--- If there's a parent, load it and do this all over again.
IF (child.data->'inReplyTo' IS NOT NULL) AND (child.data->'inReplyTo' != 'null'::jsonb) THEN
SELECT * INTO activity FROM activities
INNER JOIN objects ON COALESCE(activities.data->'object'->>'id', activities.data->>'object') = objects.data->>'id'
WHERE child.data->>'inReplyTo' = objects.data->>'id';
ELSE
RETURN true;
END IF;
END LOOP;
END;
$$ LANGUAGE plpgsql IMMUTABLE;
"""
end
# priv/repo/migrations/20190515222404_add_thread_visibility_function.exs
def restore_thread_visibility do
"""
CREATE OR REPLACE FUNCTION thread_visibility(actor varchar, activity_id varchar) RETURNS boolean AS $$
DECLARE
public varchar := 'https://www.w3.org/ns/activitystreams#Public';
child objects%ROWTYPE;
activity activities%ROWTYPE;
actor_user users%ROWTYPE;
author_fa varchar;
valid_recipients varchar[];
BEGIN
--- Fetch our actor.
SELECT * INTO actor_user FROM users WHERE users.ap_id = actor;
--- Fetch our initial activity.
SELECT * INTO activity FROM activities WHERE activities.data->>'id' = activity_id;
LOOP
--- Ensure that we have an activity before continuing.
--- If we don't, the thread is not satisfiable.
IF activity IS NULL THEN
RETURN false;
END IF;
--- We only care about Create activities.
IF activity.data->>'type' != 'Create' THEN
RETURN true;
END IF;
--- Normalize the child object into child.
SELECT * INTO child FROM objects
INNER JOIN activities ON COALESCE(activities.data->'object'->>'id', activities.data->>'object') = objects.data->>'id'
WHERE COALESCE(activity.data->'object'->>'id', activity.data->>'object') = objects.data->>'id';
--- Fetch the author's AS2 following collection.
SELECT COALESCE(users.follower_address, '') INTO author_fa FROM users WHERE users.ap_id = activity.actor;
--- Prepare valid recipients array.
valid_recipients := ARRAY[actor, public];
IF ARRAY[author_fa] && actor_user.following THEN
valid_recipients := valid_recipients || author_fa;
END IF;
--- Check visibility.
IF NOT valid_recipients && activity.recipients THEN
--- activity not visible, break out of the loop
RETURN false;
END IF;
--- If there's a parent, load it and do this all over again.
IF (child.data->'inReplyTo' IS NOT NULL) AND (child.data->'inReplyTo' != 'null'::jsonb) THEN
SELECT * INTO activity FROM activities
INNER JOIN objects ON COALESCE(activities.data->'object'->>'id', activities.data->>'object') = objects.data->>'id'
WHERE child.data->>'inReplyTo' = objects.data->>'id';
ELSE
RETURN true;
END IF;
END LOOP;
END;
$$ LANGUAGE plpgsql IMMUTABLE;
"""
end
end
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