<?php

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2019 - 2022, CodeIgniter Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package CodeIgniter
 * @author  EllisLab Dev Team
 * @copyright   Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
 * @copyright   Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
 * @copyright   Copyright (c) 2019 - 2022, CodeIgniter Foundation (https://codeigniter.com/)
 * @license https://opensource.org/licenses/MIT MIT License
 * @link    https://codeigniter.com
 * @since   Version 1.0.0
 * @filesource
 */

defined('BASEPATH') or exit('No direct script access allowed');

/**
 * CodeIgniter Security Helpers
 *
 * @package     CodeIgniter
 * @subpackage  Helpers
 * @category    Helpers
 * @author      EllisLab Dev Team
 * @link        https://codeigniter.com/userguide3/helpers/security_helper.html
 */

// ------------------------------------------------------------------------

if (! function_exists('xss_clean')) {
    /**
     * XSS Filtering
     *
     * @param   string
     * @param   bool    whether or not the content is an image file
     * @return  string
     */
    function xss_clean($str, $is_image = false)
    {
        return get_instance()->security->xss_clean($str, $is_image);
    }
}

// ------------------------------------------------------------------------

if (! function_exists('sanitize_filename')) {
    /**
     * Sanitize Filename
     *
     * @param   string
     * @return  string
     */
    function sanitize_filename($filename)
    {
        return get_instance()->security->sanitize_filename($filename);
    }
}

// --------------------------------------------------------------------

if (! function_exists('do_hash')) {
    /**
     * Hash encode a string
     *
     * @todo    Remove in version 3.1+.
     * @deprecated  3.0.0   Use PHP's native hash() instead.
     * @param   string  $str
     * @param   string  $type = 'sha1'
     * @return  string
     */
    function do_hash($str, $type = 'sha1')
    {
        if (! in_array(strtolower($type), hash_algos())) {
            $type = 'md5';
        }

        return hash($type, $str);
    }
}

// ------------------------------------------------------------------------

if (! function_exists('strip_image_tags')) {
    /**
     * Strip Image Tags
     *
     * @param   string
     * @return  string
     */
    function strip_image_tags($str)
    {
        return get_instance()->security->strip_image_tags($str);
    }
}

// ------------------------------------------------------------------------

if (! function_exists('encode_php_tags')) {
    /**
     * Convert PHP tags to entities
     *
     * @param   string
     * @return  string
     */
    function encode_php_tags($str)
    {
        return str_replace(array('<?', '?>'), array('&lt;?', '?&gt;'), $str);
    }
}