<?php
/**
* Project: Mailto: A PHP class for obfuscating e-mail addresses from spam harvesters<br />
* File: Mailto.php<br />
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or any later version.<br /><br />
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.<br /><br />
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA<br /><br />
*
* Any modifications to the library should be indicated clearly in the source code
* to inform users that the changes are not a part of the original software.<br /><br />
*
* @link http://www.debuggeddesigns.com/open-source-projects/mailto Mailto Link Obfuscator
* @link http://www.debuggeddesigns.com/open-source-projects/mailto/code Download Latest Version
* @link http://www.debuggeddesigns.com/open-source-projects/docs Online Documentation
* @copyright 2008 Debugged Interactive Designs
* @author debuggeddesigns <info@debuggeddesigns.com>
* @version 0.0.2 (January 26, 2009)
*
*/
/**
* Mailto Link Obfuscator Class.
*
*/
class Mailto {
/**
* The encoding type used for encryption
*
* @access public
* @var string
*/
var $encoding_type;
/**
* Class constructor.<br />
* Accepts a parameter
*
* <code>
* <?php
* include 'Mailto.php';
* $mailto = new Mailto();
* //$mailto = new Mailto('cc8b');
* ?>
* </code>
*
* @param string $encoding_type The encoding type used for encryption
*
*/
function Mailto($encoding_type = 'rot13') {
$this->encoding_type = $encoding_type;
}
/**
* Create an encrypted mailto link using the e-mail address and content passed as parameters.
*
* <code>
* <?php
* include 'Mailto.php';
* $mailto = new Mailto();
* //$mailto = new Mailto('cc8b');
* $mailto->createLink('info@debuggeddesigns.com','Debugged Interactive Designs');
* ?>
* </code>
*
* @param string $addr The e-mail address you want to hide from spam harvesters
* @param string $content The term that will be clickable
* @return string An encrypted anchor tag
*/
function createLink($addr, $content) {
//build this for people with js turned off
$noscript_link = '<span style="unicode-bidi:bidi-override;direction:rtl;">'.strrev($content.' > '.$addr.' <').'</span>';
//if encoding type is rot13
if($this->encoding_type=='rot13'){
//build the mailto link
$unencrypted_link = '<a href="mailto:'.$addr.'">'.$content.'</a>';
//put them together and encrypt
$encrypted_link = '<script type="text/javascript">Rot13.write(\''.str_rot13($unencrypted_link).'\');</script><noscript>'.$noscript_link . '</noscript>';
}
//if encoding type is cc8b
else if($this->encoding_type=='cc8b'){
//get a random number from 10 to 254
$key = rand(10, 254);
//encrypt the email address
$encrypted_email = $this->cc8b_encrypt($key,$addr);
//encrypt the link text
$encrypted_text = $this->cc8b_encrypt($key,$content);
//put together the
$encrypted_link = "<script type=\"text/javascript\">\n" . "Cc8b.write(\"" . $key . "." . $encrypted_email . "." . $encrypted_text . "\");\n" . "</script>" . "<noscript>" . $noscript_link . "</noscript>";
}
//if encoding type is not recognized
else
{
$encrypted_link = $noscript_link;
}
return $encrypted_link;
}
/**
*
*
* @access private
* @param string $key The random key used to encrypt
* @param string $plain_text The text to encrypt
* @return string Encrypted ascii code from the original plain text
*/
private function cc8b_encrypt($key,$plain_text)
{
$cipher_text = '';
//turn each character in the string into its hexidecimal ascii value
$ascii_plain_text = (string) bin2hex($plain_text);
//get each acii octet
for ($i = 0; $i <= strlen($ascii_plain_text) - 2; $i += 2) {
//get next octet
$temp = substr($ascii_plain_text, $i, 2);
//turn it to decimal
$temp = hexdec($temp);
//add key value to temp
$temp += $key;
//mod temp by 255 so its value is at most FF
$temp = $temp % 255;
//concatinate the hex value to ecrypted email
//check to make sure we have 2 digits
//if its 1 digit place a leading 0 infront of it (0 -> F)
if (strlen((string) dechex($temp)) < 2) {
$cipher_text .= '0' . (string) dechex($temp);
}
//else just concate the 2 digit string
else {
$cipher_text .= (string) dechex($temp);
}
}
return $cipher_text;
}
}
?>
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