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/home/develito/www/components/com_dpattachments/models/form.php

<?php
/**
 * @package    DPAttachments
 * @author     Digital Peak http://www.digital-peak.com
 * @copyright  Copyright (C) 2012 - 2020 Digital Peak. All rights reserved.
 * @license    http://www.gnu.org/licenses/gpl.html GNU/GPL
 */
defined('_JEXEC') or die();

JLoader::import('components.com_dpattachments.models.attachment', JPATH_ADMINISTRATOR);

class DPAttachmentsModelForm extends DPAttachmentsModelAttachment
{

protected function populateState()
	{
		$app = JFactory::getApplication();

// Load state from the request.
		$pk = $app->input->getInt('a_id');
		$this->setState('attachment.id', $pk);

$return = $app->input->get('return', null, 'base64');
		$this->setState('return_page', base64_decode($return));

// Load the parameters.
		$params = $app->getParams();
		$this->setState('params', $params);

$this->setState('layout', $app->input->get('layout'));
	}

public function getItem($itemId = null)
	{
		$itemId = (int)(!empty($itemId)) ? $itemId : $this->getState('attachment.id');

// Get a row instance.
		$table = $this->getTable();

// Attempt to load the row.
		$return = $table->load($itemId);

// Check for a table object error.
		if ($return === false && $table->getError()) {
			$this->setError($table->getError());

return false;
		}

$properties = $table->getProperties(1);
		$value      = JArrayHelper::toObject($properties, 'JObject');

// Convert attrib field to Registry.
		$value->params = new JRegistry();

// Compute selected asset permissions.
		$user = JFactory::getUser();

// Check edit state permission.
		if ($itemId) {
			$value->params->set('access-edit', \DPAttachments\Helper\Core::canDo('core.edit', $value->context, $value->item_id));
			$value->params->set('access-change', \DPAttachments\Helper\Core::canDo('core.edit.state', $value->context, $value->item_id));
		}

return $value;
	}

public function getReturnPage()
	{
		return base64_encode($this->getState('return_page'));
	}
}