Basic tenant structure

app/Middleware/HandleInertiaRequests.php

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+<?php
+
+namespace App\Middleware;
+
+use Illuminate\Http\Request;
+use Inertia\Middleware;
+
+class HandleInertiaRequests extends Middleware
+{
+    /**
+     * The root template that's loaded on the first page visit.
+     *
+     * @see https://inertiajs.com/server-side-setup#root-template
+     *
+     * @var string
+     */
+    protected $rootView = 'app';
+
+    /**
+     * Determines the current asset version.
+     *
+     * @see https://inertiajs.com/asset-versioning
+     */
+    public function version(Request $request): ?string
+    {
+        return parent::version($request);
+    }
+
+    /**
+     * Define the props that are shared by default.
+     *
+     * @see https://inertiajs.com/shared-data
+     *
+     * @return array<string, mixed>
+     */
+    public function share(Request $request): array
+    {
+        return [
+            ...parent::share($request),
+            //
+        ];
+    }
+}

app/Middleware/IdentifyTenant.php

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+<?php
+
+namespace App\Middleware;
+
+use App\Models\Tenant;
+use Closure;
+use Illuminate\Http\Request;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+
+class IdentifyTenant
+{
+    public function handle(Request $request, Closure $next)
+    {
+        $host = $request->getHost();
+        $tenant = Tenant::where(['url' => $host, 'has_active_instance' => true])->first();
+
+        if (! $tenant) {
+            throw new NotFoundHttpException('Tenant not found');
+        }
+
+        app()->instance('tenant', $tenant);
+        return $next($request);
+    }
+}