Corrige VNC remoto: proxy via Next.js e fix de hidratação SSR

---

- Adicionado docker/server.mjs, entry point customizado que monkey-patcha http.createServer antes do Next.js standalone subir, injetando handler de upgrade para fazer pipe TCP de WebSocket (ws://host:3000/websockify?token=...) direto para localhost:6080;
- Adicionado src/app/api/novnc/[...path]/route.ts, proxy HTTP dos assets estáticos do noVNC (vnc.html, JS, CSS) para localhost:6080, seguindo o mesmo padrão do proxy HLS;
- Corrigido bug de hidratação SSR em src/app/vnc/[id]/page.tsx: URL do iframe agora é computada apenas client-side via useEffect/useState, usando path relativo /api/novnc/ em vez de http://host:6080/;
- Atualizado config/supervisord.conf para iniciar Next.js com node /opt/server.mjs;
- Atualizado docker/Dockerfile para copiar docker/server.mjs para /opt/server.mjs;

---

config/supervisord.conf

@@ -25,7 +25,7 @@ stderr_logfile=/app/data/logs/mediamtx.log
 
 [program:nextjs]
 directory=/app
-command=node server.js
+command=node /opt/server.mjs
 environment=PORT=3000,HOSTNAME=0.0.0.0,DATA_DIR=/app/data
 autorestart=true
 priority=2

docker/Dockerfile

@@ -66,6 +66,7 @@ COPY --from=builder /build/public/ /app/public/
 COPY config/supervisord.conf /etc/supervisor/supervisord.conf
 COPY config/mediamtx.yml /etc/mediamtx.yml
 COPY scripts/ /opt/scripts/
+COPY docker/server.mjs /opt/server.mjs
 COPY docker/entrypoint.sh /entrypoint.sh
 RUN chmod +x /opt/scripts/*.sh /entrypoint.sh
 

docker/server.mjs

@@ -0,0 +1,38 @@
+// Custom entry point: patches http.createServer before Next.js starts,
+// so WebSocket upgrade requests to /websockify are proxied to localhost:6080
+// (noVNC/websockify) without exposing that port publicly.
+import http from "node:http"
+import net from "node:net"
+
+const _createServer = http.createServer.bind(http)
+
+function attachWebSocketProxy(server) {
+  server.on("upgrade", (req, socket, head) => {
+    const upstream = net.connect({ host: "127.0.0.1", port: 6080 })
+
+    upstream.once("connect", () => {
+      let raw = `${req.method} ${req.url} HTTP/1.1\r\n`
+      for (const [k, v] of Object.entries(req.headers)) {
+        raw += `${k}: ${Array.isArray(v) ? v.join(", ") : v}\r\n`
+      }
+      raw += "\r\n"
+      upstream.write(raw)
+      if (head?.length) upstream.write(head)
+      socket.pipe(upstream)
+      upstream.pipe(socket)
+    })
+
+    upstream.on("error", () => { try { socket.destroy() } catch {} })
+    socket.on("error", () => { try { upstream.destroy() } catch {} })
+    socket.on("close", () => { try { upstream.destroy() } catch {} })
+    upstream.on("close", () => { try { socket.destroy() } catch {} })
+  })
+}
+
+http.createServer = function (...args) {
+  const server = _createServer(...args)
+  attachWebSocketProxy(server)
+  return server
+}
+
+await import("/app/server.js")

src/app/api/novnc/[...path]/route.ts

@@ -0,0 +1,27 @@
+import { type NextRequest, NextResponse } from "next/server"
+
+type Ctx = { params: Promise<{ path: string[] }> }
+
+export async function GET(req: NextRequest, { params }: Ctx) {
+  const { path } = await params
+  const searchParams = req.nextUrl.searchParams.toString()
+  const query = searchParams ? `?${searchParams}` : ""
+  const upstream = `http://localhost:6080/${path.join("/")}${query}`
+
+  try {
+    const res = await fetch(upstream, {
+      headers: { Accept: req.headers.get("Accept") ?? "*/*" },
+    })
+
+    if (!res.ok) return new NextResponse(null, { status: res.status })
+
+    const headers = new Headers()
+    const ct = res.headers.get("content-type")
+    if (ct) headers.set("content-type", ct)
+    headers.set("cache-control", "no-cache")
+
+    return new NextResponse(res.body, { status: 200, headers })
+  } catch {
+    return new NextResponse(null, { status: 502 })
+  }
+}

src/app/vnc/[id]/page.tsx

@@ -38,14 +38,17 @@ function BackButton({ onClick }: { onClick: () => void }) {
 function VncInner() {
   const { id } = useParams<{ id: string }>()
   const router = useRouter()
-  const host = typeof window !== "undefined" ? window.location.hostname : "localhost"
+  const [vncUrl, setVncUrl] = useState<string | null>(null)
+
+  useEffect(() => {
     const token = encodeURIComponent(`token=${id}`)
-  const vncUrl = `http://${host}:6080/vnc.html?autoconnect=true&path=websockify%3F${token}`
+    setVncUrl(`/api/novnc/vnc.html?autoconnect=true&path=websockify%3F${token}`)
+  }, [id])
 
   return (
     <div className="relative bg-black w-screen h-screen overflow-hidden">
       <BackButton onClick={() => router.push("/")} />
-      <iframe src={vncUrl} className="w-screen h-screen border-0" allowFullScreen />
+      {vncUrl && <iframe src={vncUrl} className="w-screen h-screen border-0" allowFullScreen />}
     </div>
   )
 }