feat(middleware): Page 404 to 301 | add redirect for old page slugs, caused by title change

app/Http/Kernel.php

@@ -17,6 +17,7 @@ class Kernel extends HttpKernel
         \Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,
         \BookStack\Http\Middleware\TrimStrings::class,
         \BookStack\Http\Middleware\TrustProxies::class,
+        \BookStack\Http\Middleware\RedirectOldPageSlugs::class,
         \BookStack\Http\Middleware\PreventResponseCaching::class,
     ];
 

app/Http/Middleware/RedirectOldPageSlugs.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace BookStack\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use BookStack\Entities\Models\PageRevision;
+
+class RedirectOldPageSlugs
+{
+    public function handle(Request $request, Closure $next)
+    {
+        // Skip system/API routes
+        if ($request->is('api/*', 'assets/*', 'dist/*', 'uploads/*', '_debugbar/*', 'link/*', 'saml2/*')) {
+            return $next($request);
+        }
+
+        $path = trim($request->path(), '/');
+        if (empty($path)) {
+            return $next($request);
+        }
+
+        // Extract last path segment (potential page slug)
+        $segments = explode('/', $path);
+        $lastSegment = end($segments);
+
+        // Look for this slug in page revisions (only if it's not the current slug)
+        $revision = PageRevision::where('slug', $lastSegment)
+            ->whereHas('page', function ($query) use ($lastSegment) {
+                $query->where('slug', '!=', $lastSegment);
+            })
+            ->first();
+
+        if ($revision) {
+            // Redirect to stable permalink: /link/{page_id}
+            return redirect('/link/' . $revision->page_id, 301);
+        }
+
+        return $next($request);
+    }
+}