Hotlink koruması ( class )

<?
/*********************************************/
/* Desenvolvido por Jonis Maurin Ceará */
/* jonis@jonis.cjb.net */
/* ( LifeGuarD ) */
/* UIN: 5719948 */
/* */
/* */
/* This class block download from */
/* other sites. You can add domains */
/* that are enabled to download your */
/* files. You can also share files */
/* that are in non-web folder. */
/* */
/* */
/* Questions? */
/* e-mail: jonis@jonis.cjb.net */
/* */
/* */
/* This script is freeware, you are */
/* free to copy, but you should keep */
/* copyright note. */
/* */
/* Este script é freeware, voce pode */
/* usa-lo a vontade desde que mantenha */
/* os creditos no mesmo. */
/* */
/*********************************************/

class D_Security {

var $lista;
var $path;

function Dow_Security() {
$this->lista = array(); // Create empty host list
$this->path = "./"; // set default path do current folder
}

function SetPath($path) {
$this->path = $path;
}

function AddHost($host) {
if (empty($host)) {
return false;
}
$this->lista[] = $host;
return true;
}

function RemoveHost($host) {
for ($i=0;$i<count($this->lista);$i++) {
if ($this->lista[$i]==$host) {
$this->RemoveArrayItem($this->lista,$i);
}
}
}

function ListHosts() {
return $this->lista;
}

function RemoveArrayItem(&$ar,$item)
{
$ar = array_merge(array_splice($ar,0,$item),array_splice($ar,1));
}

function DownloadFile($filename) {
if ($this->ChecaReferer() == true) {
$fil = $this->$path.$filename;
header("Content-type: application/octet-stream");
header("Content-disposition: attachment; filename=".basename($fil));
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize("$fil"));
readfile($fil);
return true;
} else {
return false;
}

}

function ChecaReferer() {
$cont = count($this->lista);

for ($x=0;$x<$cont;$x++) {
if (eregi($this->lista[$x],$_SERVER["HTTP_REFERER"])) {
return true;
break;
}

}

}

}
// Example
$dow = new D_Security(); // Create new object
$dow->SetPath("./"); // set the folrder where the files are stored

$dow->AddHost("www.your-website.com"); // Add host to list
$dow->AddHost($_SERVER["HTTP_REFERER"]); // Add host to list

if (!$dow->DownloadFile("example.exe")) { // Download the file
echo "<br>Error: you are trying to download this file from unauthorized site<br>";
echo "Try again from authorized host now: <a href=downloader.php>link</a>";
} ?>

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hotlink koruması class