initial commit

app/api/tunnel/check/route.ts

@@ -0,0 +1,27 @@
+import { NextResponse, type NextRequest } from 'next/server';
+import { getSupabaseAdmin } from '@/lib/supabase/admin';
+import { validateSubdomain } from '@/lib/validation';
+
+export const runtime = 'nodejs';
+export const dynamic = 'force-dynamic';
+
+export async function GET(req: NextRequest) {
+  const sub = req.nextUrl.searchParams.get('subdomain');
+  const v = validateSubdomain(sub);
+  if (!v.ok) {
+    return NextResponse.json(
+      { available: false, error: v.error },
+      { status: 200 },
+    );
+  }
+  const admin = getSupabaseAdmin();
+  const { data, error } = await admin
+    .from('tunnels')
+    .select('user_id')
+    .eq('subdomain', v.value)
+    .maybeSingle<{ user_id: string }>();
+  if (error) {
+    return NextResponse.json({ available: false }, { status: 500 });
+  }
+  return NextResponse.json({ available: !data });
+}