castopod/app/Database/Migrations/2022-07-28-143030_AddActivitiesTrigger.php

<?php

declare(strict_types=1);

/**
 * Class AddActivitiesTrigger Creates activities trigger in database
 *
 * @copyright  2020 Ad Aures
 * @license    https://www.gnu.org/licenses/agpl-3.0.en.html AGPL3
 * @link       https://castopod.org/
 */

namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class AddNotificationsTrigger extends Migration
{
    public function up(): void
    {
        $activitiesTable = $this->db->prefixTable(config('Fediverse')->tablesPrefix . 'activities');
        $notificationsTable = $this->db->prefixTable('notifications');
        $createQuery = <<<CODE_SAMPLE
        CREATE TRIGGER `{$activitiesTable}_after_insert`
        AFTER INSERT ON `{$activitiesTable}`
        FOR EACH ROW
        BEGIN
        -- only create notification if new incoming activity with NULL status is created
        IF NEW.target_actor_id AND NEW.target_actor_id != NEW.actor_id AND NEW.status IS NULL THEN
            IF NEW.type IN ( 'Create', 'Like', 'Announce', 'Follow' ) THEN
                SET @type = (CASE
                                WHEN NEW.type = 'Create' THEN 'reply'
                                WHEN NEW.type = 'Like' THEN 'like'
                                WHEN NEW.type = 'Announce' THEN 'share'
                                WHEN NEW.type = 'Follow' THEN 'follow'
                            END);
                INSERT INTO `{$notificationsTable}` (`actor_id`, `target_actor_id`, `post_id`, `activity_id`, `type`, `created_at`, `updated_at`)
                    VALUES (NEW.actor_id, NEW.target_actor_id, NEW.post_id, NEW.id, @type, NEW.created_at, NEW.created_at);
            ELSE
                DELETE FROM `{$notificationsTable}`
                WHERE `actor_id` = NEW.actor_id
                AND `target_actor_id` = NEW.target_actor_id
                AND ((`type` = (CASE WHEN NEW.type = 'Undo_Follow' THEN 'follow' END) AND `post_id` IS NULL)
                    OR (`type` = (CASE
                                    WHEN NEW.type = 'Delete' THEN 'reply'
                                    WHEN NEW.type = 'Undo_Like' THEN 'like'
                                    WHEN NEW.type = 'Undo_Announce' THEN 'share'
                                END)
                        AND `post_id` = NEW.post_id));
            END IF;
        END IF;
        END
        CODE_SAMPLE;
        $this->db->query($createQuery);
    }

    public function down(): void
    {
        $activitiesTable = $this->db->prefixTable(config('Fediverse')->tablesPrefix . 'activities');
        $this->db->query("DROP TRIGGER IF EXISTS `{$activitiesTable}_after_insert`");
    }
}