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security_helper.php source code

Contents of file helpers/security_helper.php
1 <?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
2
/**
3  * CodeIgniter
4  *
5  * An open source application development framework for PHP 4.3.2 or newer
6  *
7  * @package        CodeIgniter
8  * @author        ExpressionEngine Dev Team
9  * @copyright    Copyright (c) 2008, EllisLab, Inc.
10  * @license        http://codeigniter.com/user_guide/license.html
11  * @link        http://codeigniter.com
12  * @since        Version 1.0
13  * @filesource
14  */
15
16 // ------------------------------------------------------------------------
17
18 /**
19  * CodeIgniter Security Helpers
20  *
21  * @package        CodeIgniter
22  * @subpackage    Helpers
23  * @category    Helpers
24  * @author        ExpressionEngine Dev Team
25  * @link        http://codeigniter.com/user_guide/helpers/security_helper.html
26  */
27
28 // ------------------------------------------------------------------------
29
30 /**
31  * XSS Filtering
32  *
33  * @access    public
34  * @param    string
35  * @param    bool    whether or not the content is an image file
36  * @return    string
37  */    
38
if ( ! function_exists('xss_clean'))
39 {
40     function 
xss_clean($str$is_image FALSE)
41     {
42         
$CI =& get_instance();
43         return 
$CI->input->xss_clean($str$is_image);
44     }
45 }
46
47
// --------------------------------------------------------------------
48
49 /**
50  * Hash encode a string
51  *
52  * @access    public
53  * @param    string
54  * @return    string
55  */    
56
if ( ! function_exists('dohash'))
57 {    
58     function 
dohash($str$type 'sha1')
59     {
60         if (
$type == 'sha1')
61         {
62             if ( ! 
function_exists('sha1'))
63             {
64                 if ( ! 
function_exists('mhash'))
65                 {    
66                     require_once(
BASEPATH.'libraries/Sha1'.EXT);
67                     
$SH = new CI_SHA;
68                     return 
$SH->generate($str);
69                 }
70                 else
71                 {
72                     return 
bin2hex(mhash(MHASH_SHA1$str));
73                 }
74             }
75             else
76             {
77                 return 
sha1($str);
78             }    
79         }
80         else
81         {
82             return 
md5($str);
83         }
84     }
85 }
86     
87
// ------------------------------------------------------------------------
88
89 /**
90  * Strip Image Tags
91  *
92  * @access    public
93  * @param    string
94  * @return    string
95  */    
96
if ( ! function_exists('strip_image_tags'))
97 {
98     function 
strip_image_tags($str)
99     {
100         
$str preg_replace("#<img\s+.*?src\s*=\s*[\"'](.+?)[\"'].*?\>#""\\1"$str);
101         
$str preg_replace("#<img\s+.*?src\s*=\s*(.+?).*?\>#""\\1"$str);
102             
103         return 
$str;
104     }
105 }
106     
107
// ------------------------------------------------------------------------
108
109 /**
110  * Convert PHP tags to entities
111  *
112  * @access    public
113  * @param    string
114  * @return    string
115  */    
116
if ( ! function_exists('encode_php_tags'))
117 {
118     function 
encode_php_tags($str)
119     {
120         return 
str_replace(array('<?php''<?PHP''<?''?>'),  array('&lt;?php''&lt;?PHP''&lt;?''?&gt;'), $str);
121     }
122 }
123
124
125
/* End of file security_helper.php */
126 /* Location: ./system/helpers/security_helper.php */