Refactoring: added controlled middleware and changed response class

app/Core/Controller/BaseMiddleware.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Kanboard\Core\Controller;
+
+use Kanboard\Core\Base;
+
+/**
+ * Class BaseMiddleware
+ *
+ * @package Kanboard\Core\Controller
+ * @author  Frederic Guillot
+ */
+abstract class BaseMiddleware extends Base
+{
+    /**
+     * @var BaseMiddleware
+     */
+    protected $nextMiddleware = null;
+
+    /**
+     * Execute middleware
+     */
+    abstract public function execute();
+
+    /**
+     * Set next middleware
+     *
+     * @param  BaseMiddleware $nextMiddleware
+     * @return BaseMiddleware
+     */
+    public function setNextMiddleware($nextMiddleware)
+    {
+        $this->nextMiddleware = $nextMiddleware;
+        return $this;
+    }
+
+    /**
+     * @return BaseMiddleware
+     */
+    public function getNextMiddleware()
+    {
+        return $this->nextMiddleware;
+    }
+
+    /**
+     * Move to next middleware
+     */
+    public function next()
+    {
+        if ($this->nextMiddleware !== null) {
+            if (DEBUG) {
+                $this->logger->debug(__METHOD__.' => ' . get_class($this->nextMiddleware));
+            }
+
+            $this->nextMiddleware->execute();
+        }
+    }
+}