feat: add space subdomain routing and ownership support

- Traefik wildcard HostRegexp for <space>.r*.online subdomains
- Middleware subdomain extraction and path rewriting
- Provision endpoint with owner_did acknowledgement
- Registry enforces space ownership via EncryptID JWT

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -20,7 +20,7 @@ services:
       - /tmp
     labels:
       - "traefik.enable=true"
-      - "traefik.http.routers.rtube.rule=Host(`rtube.online`) || Host(`www.rtube.online`)"
+      - "traefik.http.routers.rtube.rule=Host(`demo.rtube.online`) || Host(`rtube.online`) || Host(`www.rtube.online`) || HostRegexp(`{subdomain:[a-z0-9-]+}.rtube.online`)"
       - "traefik.http.routers.rtube.entrypoints=web,websecure"
       - "traefik.http.services.rtube.loadbalancer.server.port=3000"
       - "traefik.docker.network=traefik-public"

middleware.ts

@@ -0,0 +1,45 @@
+import { NextResponse } from 'next/server';
+import type { NextRequest } from 'next/server';
+
+/**
+ * Middleware to handle subdomain-based space routing.
+ *
+ * Routes:
+ * - rtube.online -> home/landing page
+ * - www.rtube.online -> home/landing page
+ * - <space>.rtube.online -> rewrite to /s/<space>
+ *
+ * Also handles localhost for development.
+ */
+export function middleware(request: NextRequest) {
+  const url = request.nextUrl.clone();
+  const hostname = request.headers.get('host') || '';
+
+  let subdomain: string | null = null;
+
+  // Match production: <space>.rtube.online
+  const match = hostname.match(/^([a-z0-9][a-z0-9-]*[a-z0-9]|[a-z0-9])\.\w+\.online/);
+  if (match && match[1] !== 'www') {
+    subdomain = match[1];
+  } else if (hostname.includes('localhost')) {
+    // Development: <space>.localhost:port
+    const parts = hostname.split('.localhost')[0].split('.');
+    if (parts.length > 0 && parts[0] !== 'localhost') {
+      subdomain = parts[parts.length - 1];
+    }
+  }
+
+  // If we have a subdomain, rewrite root path to space page
+  if (subdomain && subdomain.length > 0 && url.pathname === '/') {
+    url.pathname = `/s/${subdomain}`;
+    return NextResponse.rewrite(url);
+  }
+
+  return NextResponse.next();
+}
+
+export const config = {
+  matcher: [
+    '/((?!_next/static|_next/image|favicon.ico|.*\\..*|api).*)',
+  ],
+};

src/app/api/internal/provision/route.ts

@@ -0,0 +1,23 @@
+import { NextResponse } from "next/server";
+
+/**
+ * Internal provision endpoint — called by rSpace Registry when activating
+ * this app for a space. No auth required (only reachable from Docker network).
+ *
+ * Payload: { space, description, admin_email, public, owner_did }
+ * The owner_did identifies who registered the space via the registry.
+ */
+export async function POST(request: Request) {
+  const body = await request.json();
+  const space: string = body.space?.trim();
+  if (!space) {
+    return NextResponse.json({ error: "Missing space name" }, { status: 400 });
+  }
+  const ownerDid: string = body.owner_did || "";
+  return NextResponse.json({
+    status: "ok",
+    space,
+    owner_did: ownerDid,
+    message: "rtube space acknowledged",
+  });
+}