From f6132cac7e534d26ae3189b09f55be3a06aa7beb Mon Sep 17 00:00:00 2001
From: Harald Eilertsen <haraldei@anduin.net>
Date: Sat, 6 Jul 2024 11:12:53 +0200
Subject: Add class for representing XML-RPC payloads.

---
 src/XmlRpcMethod.php      | 75 +++++++++++++++++++++++++++++++++++++++++++++++
 tests/unit/XmlRpcTest.php | 26 ++++++++++++++++
 2 files changed, 101 insertions(+)
 create mode 100644 src/XmlRpcMethod.php
 create mode 100644 tests/unit/XmlRpcTest.php

diff --git a/src/XmlRpcMethod.php b/src/XmlRpcMethod.php
new file mode 100644
index 0000000..2167e53
--- /dev/null
+++ b/src/XmlRpcMethod.php
@@ -0,0 +1,75 @@
+<?php
+
+// SPDX-FileCopyrightText: 2024 Eilertsens Kodeknekkeri
+// SPDX-FileCopyrightText: 2024 Harald Eilertsen
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+namespace VolseNet\Webtrap;
+
+/**
+ * A representation of an XML-RPC method call.
+ *
+ * This is just a representation to hold information about the attempted
+ * call. It does not try to perform any action on it.
+ */
+class XmlRpcMethod
+{
+    /**
+     * Parse raw XML to an XmlRpcMethod object.
+     *
+     * We're not very strict when parsing, but trying to extract the
+     * most useful information. At the moment that is the method `name`,
+     * and an array of the `params` passed to the method.
+     *
+     * @param string $payload   The raw XML representation of the method call.
+     *
+     * @return XmlRpcMethod
+     */
+    public static function parse(string $payload): self
+    {
+        $parser = xml_parser_create();
+        xml_parse_into_struct($parser, $payload, $elements, $index);
+        xml_parser_free($parser);
+
+        $in_param = false;
+        $method_name = null;
+
+        foreach ($elements as $e) {
+            switch ($e['tag']) {
+                case 'METHODNAME':
+                    $method_name = $e['value'];
+                    break;
+
+                case 'PARAM':
+                    if ($e['type'] === 'open') {
+                        $in_param = true;
+                    } else {
+                        $in_param = false;
+                    }
+                    break;
+
+                case 'VALUE':
+                    if ($in_param) {
+                        $params[] = $e['value'];
+                    }
+                    break;
+
+                default:
+                    // nothing
+            }
+        }
+
+        return new XmlRpcMethod($method_name, $params);
+    }
+
+    /**
+     * Constructs a new XmlRpcMethod object from the method name and params.
+     *
+     * @param string $name      The method name
+     * @param array $params     An array or params for the method call.
+     */
+    public function __construct(public string $name, public array $params)
+    {
+    }
+}
diff --git a/tests/unit/XmlRpcTest.php b/tests/unit/XmlRpcTest.php
new file mode 100644
index 0000000..c245917
--- /dev/null
+++ b/tests/unit/XmlRpcTest.php
@@ -0,0 +1,26 @@
+<?php
+
+// SPDX-FileCopyrightText: 2024 Eilertsens Kodeknekkeri
+// SPDX-FileCopyrightText: 2024 Harald Eilertsen
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+namespace VolseNet\Webtrap\Tests\Unit;
+
+use PHPUnit\Framework\TestCase;
+use VolseNet\Webtrap\XmlRpcMethod;
+
+class XmlRpcTest extends TestCase
+{
+    public function testGetUserBlog(): void
+    {
+        $payload = '<methodCall><methodName>wp.getUsersBlogs</methodName>'
+            . '<params><param><value>someuser</value></param>'
+            . '<param><value>verysecretpassword</value></param></params></methodCall>';
+
+        $method = XmlRpcMethod::parse($payload);
+
+        $this->assertEquals('wp.getUsersBlogs', $method->name);
+        $this->assertEquals(['someuser', 'verysecretpassword'], $method->params);
+    }
+}
-- 
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