fixed #57

app/Http/Middleware/CanInstall.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+
+class CanInstall
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+        // Check if app is installed
+        if (env('APP_INSTALLED', true) == false) {
+            return $next($request);
+        }
+
+        // Already installed, redirect to login
+        redirect('auth/login')->send();
+    }
+}