<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Michael Dransfield <mike@blueroot.net> |
// +----------------------------------------------------------------------+
//
/**
* PEAR::HTML_Crypt
*
* The PEAR::HTML_Crypt provides methods to encrypt text, which
* can be later be decrypted using JavaScript on the client side
*
* This is very useful to prevent spam robots collecting email
* addresses from your site, included is a method to add mailto
* links to the text being generated
*
* a basic example to encrypt an email address
* $c = new HTML_Crypt('yourname@emailaddress.com', 8);
* $c->addMailTo();
* $c->output();
*
* @author Michael Dransfield <mike@blueroot.net>
* @package HTML_Crypt
* @version $Revision: 1.1 $
*/
class HTML_Crypt{
// {{{ properties
/**
* The unencrypted text
*
* @access public
* @var string
* @see setText()
*/
var $text = '';
/**
* The full javascript to be sent to the browser
*
* @access public
* @var string
* @see getScript()
*/
var $script = '';
/**
* The text encrypted - without any js
*
* @access public
* @var string
* @see cyrptText
*/
var $cryptString = '';
/**
* The number to offset the text by
*
* @access public
* @var int
*/
var $offset;
// }}}
// {{{ HTML_Crypt()
/**
* Constructor
*
* @access public
* @param string $text The text to encrypt
* @param int $offset The offset used to encrypt/decrypt
*/
function HTML_Crypt($text='', $offset=3){
$this->offset = $offset;
$this->text = $text;
$this->script = '';
}
// }}}
// {{{ setText()
/**
* Set name of the current realm
*
* @access public
* @param string $text The text to be encrypted
*/
function setText($text){
$this->text = $text;
}
// }}}
// {{{ addMailTo()
/**
* Turns the text into a mailto link (make sure
* the text only contains an email)
*
* @access public
*/
function addMailTo(){
$email = $this->text;
$this->text = '<a href="mailto:'.$email.'">'.$email.'</a>';
}
// }}}
// {{{ cryptText()
/**
* Encrypts the text
*
* @access private
*/
function cryptText(){
$length = strlen($this->text);
for ($i=0;$i<$length;$i++)
{
$current_chr = substr($this->text, $i, 1);
$inter = ord($current_chr)+$this->offset;
$enc_string .= chr($inter);
}
$this->cryptString = $enc_string;
}
// }}}
// {{{ getScript()
/**
* Set name of the current realm
*
* @access public
* @return string $script The javascript generated
*/
function getScript(){
if ($this->cryptString=='' && $this->text != ''){
$this->cryptText();
}
// get a random string to use as a function name
srand ((float) microtime() * 10000000);
$letters = array('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z');
$rnd = $letters[array_rand($letters)] . md5(time());
// the actual js (in one line to confuse)
$script = "<script language=\"JavaScript\" type=\"text/JavaScript\">var a,s,n;function $rnd(s){r='';for(i=0;i<s.length;i++){n=s.charCodeAt(i);if(n>=8364){n=128;}r+=String.fromCharCode(n-".$this->offset.");}return r;}a='".$this->cryptString."';document.write ($rnd(a));</script>";
$this->script = $script;
return $script;
}
// }}}
// {{{ output()
/**
* Outputs the full JS to the browser
*
* @access public
*/
function output(){
if ($this->script == ''){
$this->getScript();
}
return $this->script;
}
}
?>
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