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

<?php
/**
 * @author     Daniel Dimitrov
 * @date       04/08/2012
 * @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 files for the _JEXEC check
 * which prevents direct file access.
 *
 */
class jedcheckerRulesEncoding extends JEDcheckerRule
{
    /**
     * The formal ID of this rule. For example: SE1.
     *
     * @var    string
     */
    protected $id = 'encoding';

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

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


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

        // Iterate through all files
        foreach($files as $file)
        {
            // Try to find the base64 use in the file
            if($this->find($file)) {
                // Add as error to the report if it was not found
                $this->report->addError($file, JText::_('COM_JEDCHECKER_ERROR_ENCODING'));
            }
        }
    }


    /**
     * Reads a file and searches for any encoding function defined in the params
     * Not a very clever way of doing this, but it should be fine for now
     *
     * @param     string    $file    The path to the file
     * @return    boolean            True if the statement was found, otherwise False.
     */
    protected function find($file)
    {
        $content = (array) file($file);

        // Get the functions to look for
        $encodings = explode(',', $this->params->get('encodings'));

        foreach($encodings as $encoding) {
            $encoding = trim($encoding);
            foreach ($content AS $line)
            {
                // Search for "base64"
                $pos_1 = stripos($line, $encoding);

                if ($pos_1 !== false) {
                    return true;
                }
            }
        }

        return false;
    }
}