[Task] Add mercure host resolution fallback (#1770)

* Change Mercure Fallback URL resolution

* Add Unit Tests.

Author: martineiber

src/Mercure/Service/UrlService.php

@@ -13,8 +13,9 @@
 
 namespace Pimcore\Bundle\StudioBackendBundle\Mercure\Service;
 
-use Pimcore\Bundle\StaticResolverBundle\Lib\ToolResolverInterface;
 use Pimcore\Bundle\StudioBackendBundle\Mercure\Util\Constant\Mercure;
+use Symfony\Component\HttpFoundation\RequestStack;
+use LogicException;
 
 /**
  * @internal
@@ -24,7 +25,7 @@
     public function __construct(
         private ?string $serverSideUrl,
         private ?string $clientSideUrl,
-        private ToolResolverInterface $toolResolver,
+        private RequestStack $requestStack,
     ) {
     }
 
@@ -43,16 +44,30 @@ public function getClientSideUrl(): string
             return $this->getDefaultClientUrl();
         }
 
-        return str_replace(Mercure::HOST_PLACEHOLDER->value, $this->toolResolver->getHostUrl(), $this->clientSideUrl);
+        return str_replace(Mercure::HOST_PLACEHOLDER->value, $this->getHostUrl(), $this->clientSideUrl);
     }
 
     private function getDefaultServerUrl(): string
     {
-        return $this->toolResolver->getHostUrl() . '/hub/.well-known/mercure';
+        return $this->getHostUrl() . '/hub/.well-known/mercure';
     }
 
     private function getDefaultClientUrl(): string
     {
-        return $this->toolResolver->getHostUrl() . '/hub';
+        return $this->getHostUrl() . '/hub';
+    }
+
+    /**
+     * @throws LogicException
+     */
+    private function getHostUrl(): string
+    {
+        $request = $this->requestStack->getMainRequest();
+
+        if ($request === null) {
+            throw new LogicException('Mercure fallback URL resolution requires an active HTTP request.');
+        }
+
+        return $request->getSchemeAndHttpHost();
     }
 }

tests/Unit/Mercure/Service/UrlServiceTest.php

@@ -0,0 +1,90 @@
+<?php
+declare(strict_types=1);
+
+/**
+ * This source file is available under the terms of the
+ * Pimcore Open Core License (POCL)
+ * Full copyright and license information is available in
+ * LICENSE.md which is distributed with this source code.
+ *
+ *  @copyright  Copyright (c) Pimcore GmbH (https://www.pimcore.com)
+ *  @license    Pimcore Open Core License (POCL)
+ */
+
+namespace Pimcore\Bundle\StudioBackendBundle\Tests\Unit\Mercure\Service;
+
+use Codeception\Test\Unit;
+use LogicException;
+use Pimcore\Bundle\StudioBackendBundle\Mercure\Service\UrlService;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
+
+final class UrlServiceTest extends Unit
+{
+    public function testGetServerSideUrlWithCustomUrl(): void
+    {
+        $service = new UrlService('https://custom/mercure', null, new RequestStack());
+
+        $this->assertSame('https://custom/mercure', $service->getServerSideUrl());
+    }
+
+    public function testGetServerSideUrlWithDefault(): void
+    {
+        $service = new UrlService(
+            null,
+            null,
+            $this->createRequestStackWithRequest('https://example.com')
+        );
+
+        $this->assertSame('https://example.com/hub/.well-known/mercure', $service->getServerSideUrl());
+    }
+
+    public function testGetClientSideUrlWithCustomUrlReplacesPlaceholder(): void
+    {
+        $service = new UrlService(
+            null,
+            '<PIMCORE_SCHEMA_HOST>/custom-hub',
+            $this->createRequestStackWithRequest('https://example.com'),
+        );
+
+        $this->assertSame('https://example.com/custom-hub', $service->getClientSideUrl());
+    }
+
+    public function testGetClientSideUrlWithDefault(): void
+    {
+        $service = new UrlService(
+            null,
+            null,
+            $this->createRequestStackWithRequest('https://example.com')
+        );
+
+        $this->assertSame('https://example.com/hub', $service->getClientSideUrl());
+    }
+
+    public function testThrowsLogicExceptionWithoutRequest(): void
+    {
+        $service = new UrlService(null, null, new RequestStack());
+
+        $this->expectException(LogicException::class);
+        $service->getServerSideUrl();
+    }
+
+    public function testDefaultUrlIncludesNonStandardPort(): void
+    {
+        $service = new UrlService(
+            null,
+            null,
+            $this->createRequestStackWithRequest('http://localhost:8080')
+        );
+
+        $this->assertSame('http://localhost:8080/hub/.well-known/mercure', $service->getServerSideUrl());
+    }
+
+    private function createRequestStackWithRequest(string $uri): RequestStack
+    {
+        $requestStack = new RequestStack();
+        $requestStack->push(Request::create(uri: $uri));
+
+        return $requestStack;
+    }
+}