--- /dev/null
+<?php
+/**
+ * XMLRPC server acting as proxy for requests to other servers
+ * (useful e.g. for ajax-originated calls that can only connect back to
+ * the originating server).
+ *
+ * @author Gaetano Giunta
+ * @copyright (C) 2006-2015 G. Giunta
+ * @license code licensed under the BSD License: see file license.txt
+ */
+
+include_once __DIR__ . "/../../src/Autoloader.php";
+PhpXmlRpc\Autoloader::register();
+
+/**
+ * Forward an xmlrpc request to another server, and return to client the response received.
+ *
+ * DO NOT RUN AS IS IN PRODUCTION - this is an open relay !!!
+ *
+ * @param PhpXmlRpc\Request $req (see method docs below for a description of the expected parameters)
+ *
+ * @return PhpXmlRpc\Response
+ */
+function forward_request($req)
+{
+ $encoder = new \PhpXmlRpc\Encoder();
+
+ // create client
+ $timeout = 0;
+ $url = $encoder->decode($req->getParam(0));
+ $client = new PhpXmlRpc\Client($url);
+
+ if ($req->getNumParams() > 3) {
+ // we have to set some options onto the client.
+ // Note that if we do not untaint the received values, warnings might be generated...
+ $options = $encoder->decode($req->getParam(3));
+ foreach ($options as $key => $val) {
+ switch ($key) {
+ case 'Cookie':
+ break;
+ case 'Credentials':
+ break;
+ case 'RequestCompression':
+ $client->setRequestCompression($val);
+ break;
+ case 'SSLVerifyHost':
+ $client->setSSLVerifyHost($val);
+ break;
+ case 'SSLVerifyPeer':
+ $client->setSSLVerifyPeer($val);
+ break;
+ case 'Timeout':
+ $timeout = (integer)$val;
+ break;
+ } // switch
+ }
+ }
+
+ // build call for remote server
+ /// @todo find a way to forward client info (such as IP) to server, either
+ /// - as xml comments in the payload, or
+ /// - using std http header conventions, such as X-forwarded-for...
+ $reqMethod = $encoder->decode($req->getParam(1));
+ $pars = $req->getParam(2);
+ $req = new PhpXmlRpc\Request($reqMethod);
+ foreach ($pars as $par) {
+ $req->addParam($par);
+ }
+
+ // add debug info into response we give back to caller
+ PhpXmlRpc\Server::xmlrpc_debugmsg("Sending to server $url the payload: " . $req->serialize());
+
+ return $client->send($req, $timeout);
+}
+
+// run the server
+$server = new PhpXmlRpc\Server(
+ array(
+ 'xmlrpcproxy.call' => array(
+ 'function' => 'forward_request',
+ 'signature' => array(
+ array('mixed', 'string', 'string', 'array'),
+ array('mixed', 'string', 'string', 'array', 'struct'),
+ ),
+ 'docstring' => 'forwards xmlrpc calls to remote servers. Returns remote method\'s response. Accepts params: remote server url (might include basic auth credentials), method name, array of params, and (optionally) a struct containing call options',
+ ),
+ )
+);