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Simple proxy with php for use with Partytown
<?php
/**
* About this script:
* This proxy was built with PartyTown.js in mind. https://github.com/BuilderIO/partytown
* Partytown is a lazy-loaded library to help relocate resource intensive scripts into a
* web worker, and off of the main thread.
* Many third-party scripts already provide the correct CORS headers, but not all do.
* For services that do not add the correct headers, then a reverse proxy to another domain must be used in order to provide the CORS headers.
* see: https://github.com/BuilderIO/partytown/wiki/Proxying-Requests
*
* This script has only been tested on PHP 8.0
*
* @author John Morton
* @since 1.0
* @version 1.0
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*
*/
// Replace with the URL of the site you want to allow to proxy with this service
$whitelist = 'https://proxy.example.com/';
// Note that you will also need to add a header to proxy.example.com to allow
// the site that is calling out to the proxy (i.e. https://example.com)
// to have access headers to avoid CORS errors
// In an NGINX.config, that would look like this:
// add_header 'Access-Control-Allow-Origin' 'https://example.com';
// Function to log to a file for debugging
function myLogger(string $message)
{
// Replace with the path to the log file
$pathToFile = '../proxy-details.log';
// check file size and if it is too large, 1 meg = 1000000, delete it
if (file_exists($pathToFile) && filesize($pathToFile) > 1000000) {
unlink($pathToFile);
}
// if file doesn't exist, create it
if (!file_exists($pathToFile)) {
$file = fopen($pathToFile, 'w');
fclose($file);
}
$dataToLog = array(
date("Y-m-d H:i:s"), //Date and time
$message
);
$data = implode(" - ", $dataToLog);
$data .= PHP_EOL;
file_put_contents($pathToFile, $data, FILE_APPEND);
}
// Check that a http_referer is set
if (!isset($_SERVER['HTTP_REFERER'])) {
myLogger('No HTTP_REFERER');
header('HTTP/1.0 403 Forbidden');
exit;
}
// Check that the http_referer is on the whitelist
if ($_SERVER['HTTP_REFERER'] != $whitelist) {
myLogger('Incorrect HTTP_REFERER: ' . $_SERVER['HTTP_REFERER']);
header('HTTP/1.0 403 Forbidden');
exit;
}
// get url parameter
$url = $_GET['url'];
// santize url
$url = filter_var($url, FILTER_SANITIZE_URL);
// confirm that url is valid
if (filter_var($url, FILTER_VALIDATE_URL) === false) {
myLogger('Not a valid url: ' . $url);
echo "URL is not valid";
} else {
// get the url
$urlcontent = file_get_contents($url);
if ($urlcontent !== false and !empty($urlcontent)) {
myLogger('Success: ' . $url);
echo $urlcontent;
} else {
myLogger('No content retrieved for url: ' . $url);
}
}
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