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<?php
/** 
* MailEncode
* 
* Output
* 
* @autor DJ W. Eventservice <markus@dj-w.de> 
* @copyright www.dj-w.de 2004 
*/ 

/*
* URL Encoder script.
* Version 1.0 - February 2002
* (c) 2002, Paul Gregg <pgregg@pgregg.com>
* http://www.pgregg.com
*
* Function: Take an href link and the visible text and make an obfuscated
* link to prevent search engines (or spam harvesters) from picking it up.
*
* Open Source Code:   If you use this code on your site for public
* access (i.e. on the Internet) then you must attribute the author and
* source web site: http://www.pgregg.com/projects/
* You must also make this original source code available for download
* unmodified or provide a link to the source.  Additionally you must provide
* the source to any modified or translated versions or derivatives.
*
*/


//$PHP_SELF = $_SERVER['PHP_SELF'];
$href = isset($_POST['href']) ? $_POST['href'] : '';
$text = isset($_POST['text']) ? $_POST['text'] : '';
$func = isset($_POST['func']) ? $_POST['func'] : '';
//printf("<p align=right><a href=\"%ss\">Source code</a></p>\n", $_SERVER['PHP_SELF']."?".$_SERVER['QUERY_STRING'] );

$encoder_functions = array (
    "transpose" => "Transpose characters / Javscript",
    "hash" => "Hashes characters / No Javscript"
);
$valid_functions = array_keys($encoder_functions);


if ($href != "") {
# Encode the $href string according to the selected function
if ($text == "")
    $text = "No text specified.";
    Function escapeencode ($str) {
    $ret = "";
    $arr = unpack("C*", $str);
    foreach ($arr as $char)
    $ret .= sprintf("%%%X", $char);
    return $ret;
}
Function transpose($str) {
# function takes the string and swaps the order of each group of 2 chars
$len = strlen($str);
$ret = "";
for ($i=0; $i<$len; $i=$i+2) {
    if ($i+1 == $len)
        $ret .= substr($str, $i, 1);
    else
        $ret .= sprintf("%s%s", substr($str, $i+1, 1), substr($str, $i, 1));
    }
    return $ret;
}
$href = preg_replace("/[;,]/", "", $href);
if (! isset($func) ) {
    $func = "transpose";
} else {
if (! in_array($func, $valid_functions) )
    $func = "transpose";  # prevent bogus functions
}
printf("<p><b>%s</b> wird verschlüsselt mit der <b>%s</b> Verschlüsselung</p>\n ",
htmlspecialchars($href), $func);
if ($func == "transpose") {
    $code = sprintf("var s='%s';var r='';for(var i=0;i<s.length;i++,i++){r=r+s.substring(i+1,i+2)+s.substring(i,i+1)}document.write('<a href=\"'+r+'\">%s</a>');", transpose($href), $text);
    $UserCode = sprintf("%s%s%s",
    "<SCRIPT language=\"javascript\">eval(unescape('",
    escapeencode($code),
    "'))</SCRIPT>");
} elseif ($func == "hash") {
    $prepend = "";
    if (preg_match("/^mailto:/", $href)) {
        $href = preg_replace("/^mailto:/", "", $href);
        $prepend = "mailto:";
    }
    if (preg_match("/^http:\/\//", $href)) {
        $href = preg_replace("/^http:\/\//", "", $href);
        list($server,$url) = split("/", $href, 2);
        $href = $url;
        $prepend = "http://$server/";
    }
    $UserCode = sprintf("<a href=\"%s%s\">%s</a>",
    $prepend,
    escapeencode($href), $text);
}
echo '
        <table>
            <tr>
            	<td>Der Code lautet:</td>
            </tr>
            <tr>
            	<td>'.htmlspecialchars($UserCode).'</td>
            </tr>
            <tr>
            	<td>Angezeigt wird: '.$UserCode.'</td>
            </tr>
            <tr>
            	<td>Dies bitte in den HTML Quellcode kopieren</td>
            </tr>  
        </table>
        ';
} else {
        print '<form method=POST action='.$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING'].'>';
        ?>
        <table>
        <tr><td>Link</td>
        <td><input type=text name=href value="mailto:" size=30></td>
        </tr>
        <tr><td>Anzuzeigender Text</td>
        <td><input type=text name=text value="" size=30></td>
        </tr>
        <tr><td>Verschlüsselungs  Methode</td>
        <td><select name=func>
        <?php
        foreach ($encoder_functions as $key => $value)
        printf("<option value=\"%s\">%s</option>", $key, $value);
        ?>
        </select></td>
        </tr>
        <tr><td></td><td><input type=submit value="Encode"></td></tr>
        </table>
        </form>

        <?php
}
?>