OpenMediaCenter/api/RequestBase.php

<?php
require_once 'Database.php';

abstract class RequestBase {
    private array $actions = array();
    protected mysqli $conn;

    /**
     * add the action handlers in this abstract method
     */
    abstract function initHandlers();

    /**
     * adds a new action handler to the current api file
     *
     * @param $action string name of the action variable
     * @param $callback Closure callback function to be called
     */
    function addActionHandler($action, $callback) {
        $this->actions[$action] = $callback;
    }

    /**
     * runs the correct handler
     * should be called once within the api request
     */
    function handleAction() {
        $this->conn = Database::getInstance()->getConnection();

        if (isset($_POST['action'])) {
            $this->initHandlers();

            $action = $_POST['action'];

            // call the right handler
            $this->actions[$action]();
        } else {
            echo('{data:"error"}');
        }
    }
}