Centralized IP Handler

src/Api/Controller/CreateDiscussionController.php

@@ -54,7 +54,7 @@ public function __construct(Dispatcher $bus)
     protected function data(ServerRequestInterface $request, Document $document)
     {
         $actor = $request->getAttribute('actor');
-        $ipAddress = Arr::get($request->getServerParams(), 'REMOTE_ADDR', '127.0.0.1');
+        $ipAddress = $request->getAttribute('ipAddress');
 
         $discussion = $this->bus->dispatch(
             new StartDiscussion($actor, Arr::get($request->getParsedBody(), 'data', []), $ipAddress)

src/Api/Controller/CreatePostController.php

@@ -55,7 +55,7 @@ protected function data(ServerRequestInterface $request, Document $document)
         $actor = $request->getAttribute('actor');
         $data = Arr::get($request->getParsedBody(), 'data', []);
         $discussionId = Arr::get($data, 'relationships.discussion.data.id');
-        $ipAddress = Arr::get($request->getServerParams(), 'REMOTE_ADDR', '127.0.0.1');
+        $ipAddress = $request->getAttribute('ipAddress');
 
         $post = $this->bus->dispatch(
             new PostReply($discussionId, $actor, $data, $ipAddress)

src/Foundation/InstalledApp.php

@@ -55,6 +55,7 @@ public function getRequestHandler()
 
         $pipe = new MiddlewarePipe;
 
+        $pipe->pipe(new HttpMiddleware\ProcessIp());
         $pipe->pipe(new BasePath($this->basePath()));
         $pipe->pipe(new OriginalMessages);
         $pipe->pipe(

src/Http/Middleware/ProcessIp.php

@@ -0,0 +1,26 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Http\Middleware;
+
+use Illuminate\Support\Arr;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\MiddlewareInterface as Middleware;
+use Psr\Http\Server\RequestHandlerInterface;
+
+class ProcessIp implements Middleware
+{
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
+    {
+        $ipAddress = Arr::get($request->getServerParams(), 'REMOTE_ADDR', '127.0.0.1');
+
+        return $handler->handle($request->withAttribute('ipAddress', $ipAddress));
+    }
+}