<?php
// FILE: proxy.php
//
// LAST MODIFIED: 2006-03-23
//
// AUTHOR: Troy Wolf <troy@troywolf.com>
//
// DESCRIPTION: Allow scripts to request content they otherwise may not be
// able to. For example, AJAX (XmlHttpRequest) requests from a
// client script are only allowed to make requests to the same
// host that the script is served from. This is to prevent
// "cross-domain" scripting. With proxy.php, the javascript
// client can pass the requested URL in and get back the
// response from the external server.
//
// USAGE: "proxy_url" required parameter. For example:
// http://www.mydomain.com/proxy.php?proxy_url=http://www.yahoo.com
//

// proxy.php requires Troy's class_http. http://www.troywolf.com/articles
// Alter the path according to your environment.
require_once ("class_http.php");

$proxy_url = isset($_GET['proxy_url']) ? $_GET['proxy_url'] : false;
if (!$proxy_url) {
	header("HTTP/1.0 400 Bad Request");
	echo "proxy.php failed because proxy_url parameter is missing";
	exit();
}

// Instantiate the http object used to make the web requests.
// More info about this object at www.troywolf.com/articles
if (!$h = new http()) {
	header("HTTP/1.0 501 Script Error");
	echo "proxy.php failed trying to initialize the http object";
	exit();
}

$h -> url = $proxy_url;
$h -> postvars = $_POST;
if (!$h -> fetch($h -> url)) {
	header("HTTP/1.0 501 Script Error");
	echo "proxy.php had an error attempting to query the url";
	exit();
}

// Forward the headers to the client.
$ary_headers = split("\n", $h -> header);
foreach ($ary_headers as $hdr) { header($hdr);
}

// Send the response body to the client.
echo $h -> body;
?>