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lib/phpxmlrpc/demo/server/proxy.php

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+<?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',
+        ),
+    )
+);