PHP Code

<?php
//Enter the bandwidth here
$bandwidth = '32'; // KB/s
//For security reason, we will add here all the pattern that we allow for the filename
//Change this to your own needs
$allowed_file_patterns = array('/images\/(\w+)\.(jpg|gif|jpeg|png)/i');
 
function getMimeType($file_path)
{
	$mtype = '';
	if (function_exists('mime_content_type')){
    	$mtype = mime_content_type($file_path);
  	}
	elseif (function_exists('finfo_file')){
    	$finfo = finfo_open(FILEINFO_MIME);
    	$mtype = finfo_file($finfo, $file_path);
    	finfo_close($finfo);
  	} elseif (function_exists('getimagesize')){
		$finfo = @getimagesize($file_path);
		//var_dump($finfo);
		$mtype = !empty($finfo['mime'])?$finfo['mime']:'';
	}
	if ($mtype == ''){
    	     $mtype = "application/force-download";
  	}
	return $mtype;
}
$accepted_pattern = false;
foreach ($allowed_file_patterns as $pattern){
	if (preg_match($pattern,$_GET['file'])){
		$accepted_pattern = true;
	}
}
if (!$accepted_pattern){
    //Stop the script if is not a valid access
	header("HTTP/1.1 403 Forbidden");
	echo 'Forbidden request';
	exit;
 
}
 
$fileName = $_GET['file'];
$fh = @fopen($fileName,'rb');
if (!$fh){
	echo 'Unable to open file';
	exit;
}
$fileSize = filesize($fileName);
header("Content-Type: ".getMimeType($fileName));
header("Content-Length: " . $fileSize);
while(!feof($fh))
{
	//Read the allowed bandwidth, and then just wait a second
	print(fread($fh, $bandwidth*1024));
	usleep(1000000);
}
fclose($fh);
?>

RewriteEngine on
RewriteCond %{REQUEST_URI} \.(gif|jpg|jpeg|png|GIF|JPG|JPEG|PNG)$
RewriteRule (.*) bandwidth.php?file=$1 [L]

RewriteEngine on
 
#Enter the ip's or class of ip's you want to limit bellow, with [OR] between them
#All the other ip's will access the url directly, without going through bandwidth.php
RewriteCond %{REMOTE_ADDR} ^123\.45\.6\.78$ [NC,OR]
RewriteCond %{REMOTE_ADDR} ^127\.0\.0 [NC]
RewriteCond %{REQUEST_URI} \.(gif|jpg|jpeg|png|GIF|JPG|JPEG|PNG)$
RewriteRule (.*) bandwidth.php?file=$1 [L]
 
#Enter the ip's or class of ip's you want to limit bellow, with [OR] between them
#All the other ip's will access the url directly, without going through bandwidth.php
RewriteCond %{HTTP_REFERER} ^http://(www\.)?php-code.net/.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^http://(www\.)?example.com/.*$ [NC]
RewriteCond %{REQUEST_URI} \.(gif|jpg|jpeg|png|GIF|JPG|JPEG|PNG)$
RewriteRule (.*) bandwidth.php?file=$1 [L]