rudimentary "spam filter"

app/Http/Controllers/GuestbookController.php

@@ -27,21 +27,7 @@ public function show(): View {
      * @throws ValidationException
      */
     public function addEntry(Request $request): RedirectResponse {
-        $this->validate($request, [
-            'name' => 'required',
-            'message' => 'required'
-        ]);
-
-
         GuestbookEntry::insertGuestbookEntry($request);
         return back()->with('success', 'Entry submitted successfully!');
     }
-
-    public function banIP(string $addr) {
-        // TODO: Add banning system
-        // $matching_bans = DB::select('SELECT reason FROM guestbook__bans WHERE ip_address = ?', array($request->ip()));
-        // if (!empty($matching_bans)) {
-        //     return view('errors.guestbook-ipban')->with('reason', $matching_bans[0]->reason);
-        // }
-    }
 }

app/Http/Kernel.php

@@ -47,6 +47,7 @@ class Kernel extends HttpKernel
 
     protected $routeMiddleware = [
         'rate_limit' => \App\Http\Middleware\RateLimiter::class,
+        'validator' => \App\Http\Middleware\GuestbookValidate::class,
     ];
 
 

app/Http/Middleware/GuestbookValidate.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+class GuestbookValidate
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Closure(\Illuminate\Http\Request): (\Symfony\Component\HttpFoundation\Response)  $next
+     */
+    public function handle(Request $request, Closure $next): Response
+    {
+        if (
+            !$request->validate([
+                'name' => 'required',
+                'message' => 'required'
+            ]) ||
+            $this->containsUrl($request->get('message')) ||
+            $this->containsUrl($request->get('name'))
+        ) {
+            return response()->view('errors.guestbook-invalid', [], 400);
+        }
+        return $next($request);
+    }
+
+    public function containsUrl($str) {
+        $matches = [];
+        $pattern = '/\b(?:https?|ftp|www)(:\/\/)*[-A-Z0-9+&@#\/%?=~_|$!:,.;]*[A-Z0-9+&@#\/%=~_|$]/i';
+        preg_match_all($pattern, $str, $matches);
+        return count($matches[0]);
+    }
+}