<?php

// your local path is the base folder name you have the avatars,models,textures, etc. folders. If it is at your root then set to empty: $Local=”";

$Local=”../”;

// list here all external pathes you want to use (note the MISSING trailing / character!).

// the sequence is important, the script will return the FIRST file found

$aPath = array (

‘http://main_url_to_op_with_ground_textures/’,

‘http://objects.activeworlds.com/aw/’,

‘http://url3/’,

‘http://url4/’

);

// Add here your world name (and have the Enable Referer checked on the world options menu!!)

// this will protect your path used by another world

$Worlds= array (

‘ENTERWORLDNAMEHERE’

);

function url_exists($url)

{

$a_url = parse_url($url);

if (!isset($a_url['port'])) $a_url['port'] = 80;

$errno = 0;

$errstr = ”;

$timeout = 30;

if(isset($a_url['host']) && $a_url['host']!=gethostbyname($a_url['host']))

{

$fid = fsockopen($a_url['host'], $a_url['port'], $errno, $errstr, $timeout);

if (!$fid) return false;

$page = isset($a_url['path']) ?$a_url['path']:”;

$page .= isset($a_url['query'])?’?’.$a_url['query']:”;

fputs($fid, ‘HEAD ‘.$page.’ HTTP/1.1′.”\r\n”.’Host: ‘.$a_url['host'].”\r\n\r\n”);

$head = fread($fid, 4096);

fclose($fid);

return stristr($head, ‘ 200 ok’);

} else

{

return false;

}

}

// check for illegal use first

// First check on user agent (Active Worlds Browser – for the old browser, ActiveWorlds/3.60 for the new ones):

$agent=$_SERVER['HTTP_USER_AGENT'];

if (!isset($agent))

{

// no user agent – we hate it!

header(‘HTTP/1.1 403 Forbidden’);

exit();

}

if (!stristr($agent,”Active”))

{

// it is not an AW browser – kick him out!!

header(‘HTTP/1.1 403 Forbidden’);

exit();

}

// Uncomment between the ======= lines (remove the /* and the */ lines to enable checking the referer for your world:

$rqname=substr(strstr($_SERVER['REQUEST_URI'],basename(__FILE__)),strlen(basename(__FILE__))+1);

if (strstr($rqname,’../../’))

{

// someone tries to read files beyond their jurisdiction

header(‘HTTP/1.1 403 Forbidden’);

exit();

}

$filename=$_SERVER['DOCUMENT_ROOT'] . $Local . $_SERVER['PATH_INFO'];;

if (!file_exists($filename))

{

// not a local file, try the other servers

foreach ($aPath as $otherpath)

{

$filename=$otherpath . $_SERVER['PATH_INFO'];

if (url_exists($filename))

{

header(“Location: $filename”);

# Redirect it to the other OP

exit ();

}

}

header(‘HTTP/1.1 404 Not Found’);

exit();

}

// local file, do all checking

$headers = getallheaders();

if(isset($headers["If-Modified-Since"]))

{

// check if the modification time is more recent

$currentModified = filemtime($filename);

$rqtime=strtotime($headers["If-Modified-Since"]);

if ($currentmodified<$rqtime)

{

// send “Not modified” header back

header(‘HTTP/1.1 304 Not Modified’);

exit();

}

}

// check the extension to set the proper mime type

if (substr($rqname, strrpos($rqname, ‘.’)) == ‘.zip’)

{

$ctype=”application/zip”;

}

else

{

if (substr($rqname, strrpos($rqname, ‘.’)) == ‘.jpg’)

{

$ctype=”image/jpeg”;

}

else

$ctype=”application/download”; // unknown extension

}

$handle = fopen($filename, “rb”);

header(“Content-type: ” . $ctype);

header(“Content-Length: ” . filesize($filename));

fpassthru($handle);

exit ();

?>

Related links:

http://www.andras.net/

http://www.activeworlds.com