Move initial check of bearer token into a middleware

app/Http/Middleware/VerifyMicropubToken.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+
+class VerifyMicropubToken
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+        if ($request->bearerToken() === null) {
+            abort(401);
+        }
+
+        return $next($request);
+    }
+}