Fix caching issue

app/Http/Middleware/NoCacheForAuthenticatedUsers.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * Middleware to prevent caching of authenticated user pages.
+ *
+ * This prevents issues where:
+ * - CDNs (like Cloudflare) cache user-specific pages
+ * - Reverse proxies cache authenticated pages showing wrong user data
+ * - Browsers cache authenticated pages
+ * - One user could see another user's data due to cache poisoning
+ */
+class NoCacheForAuthenticatedUsers
+{
+    /**
+     * Handle an incoming request.
+     */
+    public function handle(Request $request, Closure $next): Response
+    {
+        $response = $next($request);
+
+        // For authenticated users, add headers to prevent caching of personal data
+        if (Auth::check()) {
+            // Prevent any caching of authenticated user responses
+            // 'private' tells CDNs like Cloudflare not to cache this response
+            $response->headers->set('Cache-Control', 'no-cache, no-store, must-revalidate, private, max-age=0, s-maxage=0');
+            $response->headers->set('Pragma', 'no-cache');
+            $response->headers->set('Expires', 'Thu, 01 Jan 1970 00:00:00 GMT');
+
+            // Cloudflare-specific: Tell Cloudflare to bypass cache for this response
+            // CDN-Cache-Control is respected by Cloudflare and other CDNs
+            $response->headers->set('CDN-Cache-Control', 'no-store');
+
+            // Cloudflare also respects this header
+            $response->headers->set('Cloudflare-CDN-Cache-Control', 'no-store');
+
+            // Add Vary header to ensure caches differentiate by user session
+            $existingVary = $response->headers->get('Vary', '');
+            $varyHeaders = array_filter(array_map('trim', explode(',', $existingVary)));
+
+            // Add Cookie to Vary header if not already present
+            if (! in_array('Cookie', $varyHeaders, true)) {
+                $varyHeaders[] = 'Cookie';
+            }
+            // Add Authorization to Vary header for API requests
+            if ($request->bearerToken() && ! in_array('Authorization', $varyHeaders, true)) {
+                $varyHeaders[] = 'Authorization';
+            }
+
+            $response->headers->set('Vary', implode(', ', $varyHeaders));
+        }
+
+        return $response;
+    }
+}

bootstrap/app.php

@@ -49,6 +49,7 @@ return Application::configure(basePath: dirname(__DIR__))
             \App\Http\Middleware\TrustedDevice2FAMiddleware::class, // Add our new trusted device middleware
             \App\Http\Middleware\ContentSecurityPolicy::class, // Add CSP middleware for security
             \App\Http\Middleware\SetUserTimezone::class, // Set user timezone
+            \App\Http\Middleware\NoCacheForAuthenticatedUsers::class, // Prevent Cloudflare/CDN caching of authenticated pages
         ]);
 
         $middleware->throttleApi('60,1');