add dropzone middleware

app/Http/Middleware/Dropzone.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Support\Arr;
+
+class Dropzone
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+        if (($request->method() != 'POST') && ($request->method() != 'PATCH')) {
+            return $next($request);
+        }
+
+        $multiple = false;
+
+        foreach ($request->all() as $key => $value) {
+            if (!is_array($value)) {
+                continue;
+            }
+
+            $files = [];
+            $uploaded = [];
+
+            foreach ($value as $index => $parameter) {
+                // single file uploaded..
+                if (!is_array($parameter) && !$multiple) {
+                    if (!Arr::has($value, 'dropzone')) {
+                        continue;
+                    }
+
+                    $request->request->set('uploaded_' . $key, $value);
+
+                    unset($request[$key]);
+                    break;
+                }
+
+                // multiple file uploaded..
+                if (!Arr::has($parameter, 'dropzone')) {
+                    $files[] = $parameter;
+
+                    continue;
+                }
+
+                $multiple = true;
+                $uploaded[] = $parameter;
+            }
+
+            if ($multiple && $uploaded) {
+                $request->request->set('uploaded_' . $key, $uploaded);
+                $request->request->set($key, $files);
+            }
+        }
+
+        return $next($request);
+    }
+}