InjectedByHeaderSubscriber

Author: tatevikg1

src/Domain/Messaging/EventSubscriber/InjectedByHeaderSubscriber.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpList\Core\Domain\Messaging\EventSubscriber;
+
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\Mailer\Event\MessageEvent;
+use Symfony\Component\Mime\Email;
+
+class InjectedByHeaderSubscriber implements EventSubscriberInterface
+{
+    public static function getSubscribedEvents(): array
+    {
+        return [MessageEvent::class => 'onMessage'];
+    }
+
+    public function onMessage(MessageEvent $event): void
+    {
+        // todo: add custom header only to messages sent individually not from campaigns
+        // when the email is generated from a webpage (quite possible :-) add a "received line" to identify the origin
+        $msg = $event->getMessage();
+        if (!$msg instanceof Email)
+        {
+            return;
+        }
+
+        // Only when triggered by HTTP request context (not CLI workers)
+        if (PHP_SAPI === 'cli')
+        {
+            return;
+        }
+
+        $ip = $_SERVER['REMOTE_ADDR'] ?? 'unknown';
+        $host = gethostname() ?: 'unknown-host';
+        $time = date('r', $_SERVER['REQUEST_TIME'] ?? time());
+
+        $msg->getHeaders()->addTextHeader(
+            'X-phpList-Injected-By',
+            "from [$ip] by $host with HTTP; $time"
+        );
+    }
+}