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proxy.php
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proxy.php
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<?php
/**
* @name PHP Proxy
* @author Jens Segers
* @link http://www.jenssegers.be
* @license MIT License Copyright (c) 2013 Jens Segers
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
class Proxy {
// curl handle
protected $ch;
// configuration
protected $config = array();
/**
* New proxy instance
*/
function __construct()
{
// load the config
$config = array();
require "config.php";
// check config
if (!count($config)) die("Please provide a valid configuration");
$this->config = $config;
// initialize curl
$this->ch = curl_init();
@curl_setopt($this->ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($this->ch, CURLOPT_MAXREDIRS, 10);
curl_setopt($this->ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($this->ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($this->ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($this->ch, CURLOPT_HEADER, true);
curl_setopt($this->ch, CURLOPT_TIMEOUT, $this->config["timeout"]);
curl_setopt($this->ch, CURLOPT_USERAGENT, "PHP Proxy");
if (!empty($this->config['user']) && !empty($this->config['pass'])){
curl_setopt($this->ch, CURLOPT_USERPWD, "{$this->config['user']}:{$this->config['pass']}");
curl_setopt($this->ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
}
}
/**
* Forward the current request to this url
*
* @param string $url
*/
public function forward($url = '')
{
// build the correct url
if (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == "on")
{
$url = "https://" . $this->config["server"] . ":" . $this->config["https_port"] . "/" . ltrim($url, "/");
}
else
{
$url = "http://" . $this->config["server"] . ":" . $this->config["http_port"] . "/" . ltrim($url, "/");
}
// set url
curl_setopt($this->ch, CURLOPT_URL, $url);
// forward request headers
$headers = $this->get_request_headers();
$this->set_request_headers($headers);
// forward post
if ($_SERVER["REQUEST_METHOD"] == "POST")
{
if(in_array($this->get_content_type($headers), array('application/x-www-form-urlencoded','multipart/form-data')))
{
$this->set_post($_POST);
}
else
{
// just grab the raw post data
$fp = fopen('php://input','r');
$post = stream_get_contents($fp);
fclose($fp);
$this->set_post($post);
}
} elseif ($_SERVER["REQUEST_METHOD"] == "HEAD") {
curl_setopt($this->ch, CURLOPT_NOBODY, true);
}
// execute
$data = curl_exec($this->ch);
$info = curl_getinfo($this->ch);
// extract response from headers
$body = $info["size_download"] ? substr($data, $info["header_size"], $info["size_download"]) : "";
// forward response headers
$headers = substr($data, 0, $info["header_size"]);
$this->set_response_headers($headers);
// close connection
curl_close($this->ch);
// output html
echo $body;
}
/**
* Get the content-type of the request
*/
protected function get_content_type( $headers )
{
foreach( $headers as $name => $value ){
if( 'content-type' == strtolower($name) ){
$parts = explode(';', $value);
return strtolower($parts[0]);
}
}
return null;
}
/**
* Get the headers of the current request
*/
protected function get_request_headers()
{
// use native getallheaders function
if (function_exists('getallheaders')) return getallheaders();
// fallback
$headers = '';
foreach ($_SERVER as $name => $value)
{
if (substr($name, 0, 5) == 'HTTP_')
{
$headers[str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))))] = $value;
}
}
return $headers;
}
/**
* Pass the request headers to cURL
*
* @param array $request
*/
protected function set_request_headers($request)
{
// headers to strip
$strip = array("Content-Length", "Host");
$headers = array();
foreach ($request as $key => $value)
{
if ($key && !in_array($key, $strip))
{
$headers[] = "$key: $value";
}
}
curl_setopt($this->ch, CURLOPT_HTTPHEADER, $headers);
}
/**
* Pass the cURL response headers to the user
*
* @param array $response
*/
protected function set_response_headers($response)
{
// headers to strip
$strip = array("Transfer-Encoding");
// split headers into an array
$headers = explode("\n", $response);
// process response headers
foreach ($headers as &$header)
{
// skip empty headers
if (!$header) continue;
// get header key
$pos = strpos($header, ":");
$key = substr($header, 0, $pos);
// modify redirects
if (strtolower($key) == "location")
{
$base_url = $_SERVER["HTTP_HOST"];
$base_url .= rtrim(str_replace(basename($_SERVER["SCRIPT_NAME"]), "", $_SERVER["SCRIPT_NAME"]), "/");
// replace ports and forward url
$header = str_replace(":" . $this->config["http_port"], "", $header);
$header = str_replace(":" . $this->config["https_port"], "", $header);
$header = str_replace($this->config["server"], $base_url, $header);
}
// set headers
if (!in_array($key, $strip))
{
header($header, FALSE);
}
}
}
/**
* Set POST values including FILES support
*
* @param array $post
*/
protected function set_post($post)
{
// file upload support
if (count($_FILES))
{
foreach ($_FILES as $key => $file)
{
$parts = pathinfo($file["tmp_name"]);
$name = $parts["dirname"] . "/" . $file["name"];
rename($file["tmp_name"], $name);
$post[$key] = "@" . $name;
}
}
else if( is_array( $post ) )
{
$post = http_build_query($post);
}
curl_setopt($this->ch, CURLOPT_POST, 1);
curl_setopt($this->ch, CURLOPT_POSTFIELDS, $post);
}
}