com_release_checking/admin/controllers/ajax.json.php

<?php
/**
 * @package    Joomla.CMS
 * @maintainer Llewellyn van der Merwe <https://git.vdm.dev/Llewellyn>
 *
 * @created    29th July, 2020
 * @copyright  (C) 2020 Open Source Matters, Inc. <http://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

// No direct access to this file
defined('_JEXEC') or die('Restricted access');

use Joomla\CMS\MVC\Controller\BaseController;
use Joomla\Utilities\ArrayHelper;

/**
 * Release_checking Ajax Base Controller
 */
class Release_checkingControllerAjax extends BaseController
{
	public function __construct($config)
	{
		parent::__construct($config);
		// make sure all json stuff are set
		JFactory::getDocument()->setMimeEncoding( 'application/json' );
		// get the application
		$app = JFactory::getApplication();
		$app->setHeader('Content-Disposition','attachment;filename="getajax.json"');
		$app->setHeader('Access-Control-Allow-Origin', '*');
		// load the tasks 
		$this->registerTask('getAction', 'ajax');
		$this->registerTask('getActionDescription', 'ajax');
	}

	public function ajax()
	{
		// get the user for later use
		$user 		= JFactory::getUser();
		// get the input values
		$jinput 	= JFactory::getApplication()->input;
		// check if we should return raw
		$returnRaw	= $jinput->get('raw', false, 'BOOLEAN');
		// return to a callback function
		$callback	= $jinput->get('callback', null, 'CMD');
		// Check Token!
		$token 		= JSession::getFormToken();
		$call_token	= $jinput->get('token', 0, 'ALNUM');
		if($jinput->get($token, 0, 'ALNUM') || $token === $call_token)
		{
			// get the task
			$task = $this->getTask();
			switch($task)
			{
				case 'getAction':
					try
					{
						$contextValue = $jinput->get('context', NULL, 'INT');
						$joomla_versionValue = $jinput->get('joomla_version', NULL, 'INT');
						$current_idValue = $jinput->get('current_id', NULL, 'INT');
						if($contextValue && $user->id != 0 && $joomla_versionValue)
						{
							$result = $this->getModel('ajax')->getAction($contextValue, $joomla_versionValue, $current_idValue);
						}
						else
						{
							$result = false;
						}
						if($callback)
						{
							echo $callback . "(".json_encode($result).");";
						}
						elseif($returnRaw)
						{
							echo json_encode($result);
						}
						else
						{
							echo "(".json_encode($result).");";
						}
					}
					catch(Exception $e)
					{
						if($callback)
						{
							echo $callback."(".json_encode($e).");";
						}
						elseif($returnRaw)
						{
							echo json_encode($e);
						}
						else
						{
							echo "(".json_encode($e).");";
						}
					}
				break;
				case 'getActionDescription':
					try
					{
						$actionValue = $jinput->get('action', NULL, 'INT');
						if($actionValue && $user->id != 0)
						{
							$result = $this->getModel('ajax')->getActionDescription($actionValue);
						}
						else
						{
							$result = false;
						}
						if($callback)
						{
							echo $callback . "(".json_encode($result).");";
						}
						elseif($returnRaw)
						{
							echo json_encode($result);
						}
						else
						{
							echo "(".json_encode($result).");";
						}
					}
					catch(Exception $e)
					{
						if($callback)
						{
							echo $callback."(".json_encode($e).");";
						}
						elseif($returnRaw)
						{
							echo json_encode($e);
						}
						else
						{
							echo "(".json_encode($e).");";
						}
					}
				break;
			}
		}
		else
		{
			// return to a callback function
			if($callback)
			{
				echo $callback."(".json_encode(false).");";
			}
			elseif($returnRaw)
			{
				echo json_encode(false);
			}
			else
			{
				echo "(".json_encode(false).");";
			}
		}
	}
}