Bind app sessions to the platform auth session.

Clear local sessions when auth.ladill.com signs out and ping the platform session from keepalive.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Http/Controllers/Auth/SsoLoginController.php

@@ -138,6 +138,18 @@ class SsoLoginController extends Controller
         return redirect()->away($this->defaultSignedOutUrl());
     }
 
+    /** Platform session ended — clear this app and offer silent sign-in again. */
+    public function platformSignedOut(Request $request): RedirectResponse
+    {
+        Auth::logout();
+        $request->session()->invalidate();
+        $request->session()->regenerateToken();
+
+        return redirect()->route('sso.connect', [
+            'redirect' => (string) $request->query('redirect', ''),
+        ]);
+    }
+
     public function logoutBridge(Request $request): View
     {
         $return = $this->safeReturnUrl((string) $request->query('return', ''));

app/Http/Middleware/EnsurePlatformSession.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\Http;
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * App sessions are subordinate to the platform (auth.ladill.com) session.
+ * When the platform session ends, clear this app's local session too.
+ */
+class EnsurePlatformSession
+{
+    public function handle(Request $request, Closure $next): Response
+    {
+        if (! Auth::check()) {
+            return $next($request);
+        }
+
+        $authDomain = trim((string) config('app.auth_domain', ''));
+        if ($authDomain === '') {
+            return $next($request);
+        }
+
+        $cookieHeader = (string) $request->headers->get('Cookie', '');
+        if ($cookieHeader === '') {
+            return $this->clearAppSession($request);
+        }
+
+        try {
+            $response = Http::withHeaders(['Cookie' => $cookieHeader])
+                ->timeout(3)
+                ->get('https://'.$authDomain.'/sso/ping');
+        } catch (\Throwable) {
+            return $next($request);
+        }
+
+        if ($response->status() === 401) {
+            return $this->clearAppSession($request);
+        }
+
+        return $next($request);
+    }
+
+    private function clearAppSession(Request $request): Response
+    {
+        Auth::logout();
+        $request->session()->invalidate();
+        $request->session()->regenerateToken();
+
+        return redirect()->route('sso.connect', [
+            'redirect' => $request->fullUrl(),
+        ]);
+    }
+}