77 lines
2.8 KiB
Elixir
77 lines
2.8 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Repo.Migrations.AddThreadVisibilityFunction do
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use Ecto.Migration
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@disable_ddl_transaction true
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def up do
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statement = """
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CREATE OR REPLACE FUNCTION thread_visibility(actor varchar, activity_id varchar) RETURNS boolean AS $$
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DECLARE
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public varchar := 'https://www.w3.org/ns/activitystreams#Public';
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child objects%ROWTYPE;
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activity activities%ROWTYPE;
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actor_user users%ROWTYPE;
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author_fa varchar;
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valid_recipients varchar[];
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BEGIN
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--- Fetch our actor.
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SELECT * INTO actor_user FROM users WHERE users.ap_id = actor;
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--- Fetch our initial activity.
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SELECT * INTO activity FROM activities WHERE activities.data->>'id' = activity_id;
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LOOP
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--- Ensure that we have an activity before continuing.
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--- If we don't, the thread is not satisfiable.
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IF activity IS NULL THEN
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RETURN false;
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END IF;
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--- We only care about Create activities.
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IF activity.data->>'type' != 'Create' THEN
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RETURN true;
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END IF;
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--- Normalize the child object into child.
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SELECT * INTO child FROM objects
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INNER JOIN activities ON COALESCE(activities.data->'object'->>'id', activities.data->>'object') = objects.data->>'id'
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WHERE COALESCE(activity.data->'object'->>'id', activity.data->>'object') = objects.data->>'id';
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--- Fetch the author's AS2 following collection.
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SELECT COALESCE(users.follower_address, '') INTO author_fa FROM users WHERE users.ap_id = activity.actor;
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--- Prepare valid recipients array.
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valid_recipients := ARRAY[actor, public];
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IF ARRAY[author_fa] && actor_user.following THEN
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valid_recipients := valid_recipients || author_fa;
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END IF;
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--- Check visibility.
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IF NOT valid_recipients && activity.recipients THEN
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--- activity not visible, break out of the loop
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RETURN false;
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END IF;
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--- If there's a parent, load it and do this all over again.
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IF (child.data->'inReplyTo' IS NOT NULL) AND (child.data->'inReplyTo' != 'null'::jsonb) THEN
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SELECT * INTO activity FROM activities
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INNER JOIN objects ON COALESCE(activities.data->'object'->>'id', activities.data->>'object') = objects.data->>'id'
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WHERE child.data->>'inReplyTo' = objects.data->>'id';
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ELSE
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RETURN true;
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END IF;
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END LOOP;
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END;
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$$ LANGUAGE plpgsql IMMUTABLE;
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"""
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execute(statement)
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end
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def down do
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execute("drop function if exists thread_visibility(actor varchar, activity_id varchar)")
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end
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end
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