com_clubs/src/site/controllers/parts.json.php

<?php

use Joomla\CMS\MVC\Controller\BaseController;
use Joomla\CMS\Response\JsonResponse;
use Joomla\CMS\Factory;

// No direct access.
defined('_JEXEC') or die;

abstract class UserException extends Exception {}
class InvalidUserDataException extends UserException {}

class ClubsHelperControllerUser
{
    
    public function parse($fcnName, $user, $post)
    {
        switch($fcnName)
        {
            case 'name':
                return $this->editName($user, $post);
                
            default:
                throw new Exception();
        }
    }
    
    public function editName($user, $post)
    {
        $name = $post->getString('name');
        if(strlen($name) < 5)
            throw new InvalidUserDataException("Der Name muss mindestens 5 Zeichen lang sein.");
        
        $user->setName($name);
        $user->save();
        return 'index.php?option=com_clubs&view=mypage&layout=parts&type=name';
    }
}

class ClubsControllerParts extends BaseController
{
    
    public function edit()
    {
        $auth = new ClubsHelperAuth();
        $user = $auth->getCurrentUser();
        $app = Factory::getApplication();
        $post = $app->input->post;
        
        try
        {
            $ret = $this->callMethod($user, $post);
            echo new JsonResponse($ret);
        }
        catch(UserException $e)
        {
            echo new JsonResponse($e);
        }
    }
    
    /**
     * @param CommonClubsModelUser $user
     * @param JInput $post
     */
    private function callMethod($user, $post)
    {
        $partname = $post->getCmd('partname');
        
        if(! preg_match('/.*\..*/', $partname))
            throw new Exception();
        
        list($objname, $fcnName) = explode('.', $partname, 2);
        
        switch($objname)
        {
            case 'user':
                $obj = new ClubsHelperControllerUser();
                return $obj->parse($fcnName, $user, $post);
                
            default:
                throw new Exception();
        }
    }
    
}