feat: migrate to Nuxt 4 (Nitro) and Tailwind CSS v3

server/lib/drivers/telegram/updates.ts

@@ -0,0 +1,45 @@
+import type { Env } from "../../types";
+import { handleTelegramUpdate } from "./commands";
+
+const MAX_BODY_SIZE = 1024 * 1024;
+
+function timingSafeEqual(a: string, b: string): boolean {
+  if (a.length !== b.length) return false;
+  let diff = 0;
+  for (let i = 0; i < a.length; i++) {
+    diff |= a.charCodeAt(i) ^ b.charCodeAt(i);
+  }
+  return diff === 0;
+}
+
+/** Handle a POST to the Telegram webhook endpoint. */
+export async function handleTelegramWebhookRequest(request: Request, env: Env): Promise<Response> {
+  const contentLength = Number(request.headers.get("content-length") ?? 0);
+  if (contentLength > MAX_BODY_SIZE) {
+    return new Response("Request too large", { status: 413 });
+  }
+
+  const secret = env.TELEGRAM_WEBHOOK_SECRET;
+  if (secret) {
+    const token = request.headers.get("X-Telegram-Bot-Api-Secret-Token");
+    if (!token || !timingSafeEqual(token, secret)) {
+      return new Response("Invalid secret", { status: 401 });
+    }
+  }
+
+  const rawBody = await request.text();
+  if (rawBody.length > MAX_BODY_SIZE) {
+    return new Response("Request too large", { status: 413 });
+  }
+
+  let update: unknown;
+  try {
+    update = JSON.parse(rawBody);
+  } catch {
+    return new Response("Invalid JSON", { status: 400 });
+  }
+
+  // Telegram expects a quick 200; process commands in the background.
+  await handleTelegramUpdate(env, update);
+  return new Response("ok");
+}