Add a sample Middleware to test the new Builder

app/middlewares/CatchExceptionMiddleware.php

@@ -1,14 +1,24 @@
 <?php
 
+/**
+ * @package     Mautic
+ * @copyright   2016 Mautic Contributors. All rights reserved.
+ * @author      Mautic
+ * @link        http://mautic.org
+ * @license     GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
+ */
+
 namespace Mautic\Middleware;
 
 use Mautic\CoreBundle\Exception\DatabaseConnectionException;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 
-class CatchExceptionMiddleware implements HttpKernelInterface
+class CatchExceptionMiddleware implements HttpKernelInterface, PrioritizedMiddlewareInterface
 {
+    const PRIORITY = 1;
+
     /**
      * @var HttpKernelInterface
      */
@@ -48,4 +58,12 @@ public function handle(Request $request, $type = self::MASTER_REQUEST, $catch =
         include MAUTIC_ROOT_DIR . '/offline.php';
         exit;
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getPriority()
+    {
+        return self::PRIORITY; 
+    }
 }

app/middlewares/MiddlewareBuilder.php

@@ -0,0 +1,52 @@
+<?php
+
+/**
+ * @package     Mautic
+ * @copyright   2016 Mautic Contributors. All rights reserved.
+ * @author      Mautic
+ * @link        http://mautic.org
+ * @license     GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
+ */
+
+namespace Mautic\Middleware;
+
+use Stack\StackedHttpKernel;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+class MiddlewareBuilder
+{
+    protected $specs;
+
+    public function __construct()
+    {
+        $this->specs = new \SplPriorityQueue();
+
+        $middlewares = glob(__DIR__ . '/*Middleware.php');
+
+        foreach ($middlewares as $middleware) {
+            $this->push('Mautic\\Middleware\\' . basename(substr($middleware, 0, -4)));
+        }
+    }
+
+    public function push($kernelClass)
+    {
+        $reflection = new \ReflectionClass($kernelClass);
+        $priority = $reflection->getConstant('PRIORITY');
+
+        $this->specs->insert($reflection, $priority);
+    }
+
+    public function resolve(HttpKernelInterface $app)
+    {
+        $middlewares = array($app);
+
+        /** @var \ReflectionClass $spec */
+        foreach ($this->specs as $spec) {
+            $app = $spec->newInstanceArgs([$app]);
+
+            array_unshift($middlewares, $app);
+        }
+
+        return new StackedHttpKernel($app, $middlewares);
+    }
+}

app/middlewares/PrioritizedMiddlewareInterface.php

@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * @package     Mautic
+ * @copyright   2016 Mautic Contributors. All rights reserved.
+ * @author      Mautic
+ * @link        http://mautic.org
+ * @license     GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
+ */
+
+namespace Mautic\Middleware;
+
+interface PrioritizedMiddlewareInterface
+{
+    /**
+     * Get the middleware's priority
+     *
+     * @return int
+     */
+    public function getPriority();
+}

app/middlewares/SetMauticHeaderMiddleware.php

@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * @package     Mautic
+ * @copyright   2016 Mautic Contributors. All rights reserved.
+ * @author      Mautic
+ * @link        http://mautic.org
+ * @license     GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
+ */
+
+namespace Mautic\Middleware;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+class SetMauticHeaderMiddleware implements HttpKernelInterface, PrioritizedMiddlewareInterface
+{
+    const PRIORITY = 2;
+
+    /**
+     * @var HttpKernelInterface
+     */
+    protected $app;
+
+    /**
+     * CatchExceptionMiddleware constructor.
+     *
+     * @param HttpKernelInterface $app
+     */
+    public function __construct(HttpKernelInterface $app)
+    {
+        $this->app = $app;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function handle(Request $request, $type = self::MASTER_REQUEST, $catch = true)
+    {
+        $response = $this->app->handle($request, $type, $catch);
+
+        $response->headers->set('X-Mautic-Version', \AppKernel::MAJOR_VERSION . '.' . \AppKernel::MINOR_VERSION . '.' . \AppKernel::PATCH_VERSION . \AppKernel::EXTRA_VERSION);
+
+        return $response;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getPriority()
+    {
+        return self::PRIORITY;
+    }
+}

index.php

@@ -46,6 +46,4 @@
 $kernel = new AppKernel('prod', false);
 $kernel->loadClassCache();
 
-Stack\run((new Stack\Builder)
-    ->push('Mautic\Middleware\CatchExceptionMiddleware')
-    ->resolve($kernel));
+Stack\run((new \Mautic\Middleware\MiddlewareBuilder)->resolve($kernel));

index_dev.php

@@ -56,5 +56,4 @@
 $kernel = new AppKernel('dev', false);
 $kernel->loadClassCache();
 
-Stack\run((new Stack\Builder)
-    ->resolve($kernel));
+Stack\run((new \Mautic\Middleware\MiddlewareBuilder)->resolve($kernel));