Sitemap condition and no-index

extend.php

@@ -59,4 +59,7 @@
 
     (new Extend\Event())
         ->subscribe(Listeners\SettingsListener::class),
+
+    (new Extend\Frontend('forum'))
+        ->content(Listeners\NoIndexListener::class),
 ];

src/Listeners/NoIndexListener.php

@@ -0,0 +1,49 @@
+<?php
+
+/*
+ * This file is part of fof/sitemap.
+ *
+ * Copyright (c) FriendsOfFlarum.
+ *
+ *  For the full copyright and license information, please view the LICENSE
+ *  file that was distributed with this source code.
+ *
+ */
+
+namespace FoF\Sitemap\Listeners;
+
+use Flarum\Frontend\Document;
+use Flarum\Settings\SettingsRepositoryInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Flarum\Extension\ExtensionManager;
+use Illuminate\Support\Arr;
+
+class NoIndexListener
+{
+    public function __construct(protected ExtensionManager $extensionManager)
+    {}
+
+    public function __invoke(Document $document, ServerRequestInterface $request)
+    {
+        $noIndexTags = [38, 33, 35, 36]; // Add tags here so their discussions include the no-index
+
+        if( ! $this->extensionManager->isEnabled('flarum-tags')){
+            return;
+        }
+
+        $type = Arr::get($document->getForumApiDocument(), 'data.type');
+
+        if($type != 'discussions'){
+            return;
+        }
+
+        $tags = Arr::get($document->getForumApiDocument(), 'data.relationships.tags.data');
+
+        foreach($tags as $tag){
+            if(in_array($tag['id'], $noIndexTags)){
+                $document->head[] = '<meta name="robots" content="noindex">';
+                return;
+            }
+        }
+    }
+}

src/Resources/Discussion.php

@@ -24,6 +24,12 @@ public function query(): Builder
     {
         $query = Model::whereVisibleTo(new Guest());
 
+        if(static::$extensionManager->isEnabled('flarum-tags')){
+            $query->whereDoesntHave('tags', function($query){
+                $query->whereIn('id', [38, 33, 35, 36]); // Add tags here so their discussions aren't included in sitemap
+            });
+        }
+
         if (static::$settings->get('fof-sitemap.riskyPerformanceImprovements')) {
             // Limiting the number of columns to fetch improves query time
             // This is a risky optimization because of 2 reasons: