jedchecker/source/administrator/components/com_jedchecker/libraries/rules/xmllicense.php

<?php
/**
 * @author     eaxs
 * @date       07/06/2012
 * @copyright  Copyright (C) 2008 - 2012 compojoom.com . All rights reserved.
 * @license    GNU General Public License version 2 or later; see LICENSE
 */

defined('_JEXEC') or die('Restricted access');


// Include the rule base class
require_once(JPATH_COMPONENT_ADMINISTRATOR.'/models/rule.php');


/**
 * This class searches all xml manifestes for a valid license.
 *
 */
class jedcheckerRulesXMLlicense extends JEDcheckerRule
{
    /**
     * The formal ID of this rule. For example: SE1.
     *
     * @var    string
     */
    protected $id = 'PH3';

    /**
     * The title or caption of this rule.
     *
     * @var    string
     */
    protected $title = 'COM_JEDCHECKER_RULE_PH3';

    /**
     * The description of this rule.
     *
     * @var    string
     */
    protected $description = 'COM_JEDCHECKER_RULE_PH3_DESC';


    /**
     * Initiates the search and check
     *
     * @return    void
     */
    public function check()
    {
        // Find all XML files of the extension
        $files = JFolder::files($this->basedir, '.xml$', true, true);

        // Iterate through all the xml files
        foreach ($files as $file)
        {
            // Try to find the license
            $this->find($file);
        }
    }


    /**
     * Reads a file and searches for the license
     *
     * @param     string    $file    The path to the file
     * @return    boolean            True if the license was found, otherwise False.
     */
    protected function find($file)
    {
        $xml = JFactory::getXML($file);

        // Failed to parse the xml file.
        // Assume that this is not a extension manifest
        if (!$xml) return true;

        // Check if this is an extension manifest
        // 1.5 uses 'install', 1.6 uses 'extension'
		if ($xml->getName() != 'install' && $xml->getName() != 'extension')
		{
			return true;
		}

        // Check if there's a license tag
        if (!isset($xml->license)) {
            $this->report->addError($file, 'COM_JEDCHECKER_ERROR_XML_LICENSE_NOT_FOUND');
            return false;
        }

        // Check if the license is gpl
        if (stripos($xml->license, 'gpl') === false &&
            stripos($xml->license, 'general public license') === false)
        {
            $this->report->addCompat($file, 'COM_JEDCHECKER_ERROR_XML_LICENSE_NOT_GPL');
            return false;
        }


        // All checks passed. Return true
        return true;
    }
}