UsernameRule.php
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<?php
/**
* Joomla! Content Management System
*
* @copyright Copyright (C) 2005 - 2019 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
namespace Joomla\CMS\Form\Rule;
defined('JPATH_PLATFORM') or die;
use Joomla\CMS\Form\Form;
use Joomla\CMS\Form\FormRule;
use Joomla\Registry\Registry;
/**
* Form Rule class for the Joomla Platform.
*
* @since 1.7.0
*/
class UsernameRule extends FormRule
{
/**
* Method to test the username for uniqueness.
*
* @param \SimpleXMLElement $element The SimpleXMLElement object representing the `<field>` tag for the form field object.
* @param mixed $value The form field value to validate.
* @param string $group The field name group control value. This acts as an array container for the field.
* For example if the field has name="foo" and the group value is set to "bar" then the
* full field name would end up being "bar[foo]".
* @param Registry $input An optional Registry object with the entire data set to validate against the entire form.
* @param Form $form The form object for which the field is being tested.
*
* @return boolean True if the value is valid, false otherwise.
*
* @since 1.7.0
*/
public function test(\SimpleXMLElement $element, $value, $group = null, Registry $input = null, Form $form = null)
{
// Get the database object and a new query object.
$db = \JFactory::getDbo();
$query = $db->getQuery(true);
// Build the query.
$query->select('COUNT(*)')
->from('#__users')
->where('username = ' . $db->quote($value));
// Get the extra field check attribute.
$userId = ($form instanceof Form) ? $form->getValue('id') : '';
$query->where($db->quoteName('id') . ' <> ' . (int) $userId);
// Set and query the database.
$db->setQuery($query);
$duplicate = (bool) $db->loadResult();
if ($duplicate)
{
return false;
}
return true;
}
}