feat(gateway): add models.list

src/telegram/probe.ts

@@ -0,0 +1,96 @@
+import { makeProxyFetch } from "./proxy.js";
+
+const TELEGRAM_API_BASE = "https://api.telegram.org";
+
+export type TelegramProbe = {
+  ok: boolean;
+  status?: number | null;
+  error?: string | null;
+  elapsedMs: number;
+  bot?: { id?: number | null; username?: string | null };
+  webhook?: { url?: string | null; hasCustomCert?: boolean | null };
+};
+
+async function fetchWithTimeout(
+  url: string,
+  timeoutMs: number,
+  fetcher: typeof fetch,
+): Promise<Response> {
+  const controller = new AbortController();
+  const timer = setTimeout(() => controller.abort(), timeoutMs);
+  try {
+    return await fetcher(url, { signal: controller.signal });
+  } finally {
+    clearTimeout(timer);
+  }
+}
+
+export async function probeTelegram(
+  token: string,
+  timeoutMs: number,
+  proxyUrl?: string,
+): Promise<TelegramProbe> {
+  const started = Date.now();
+  const fetcher = proxyUrl ? makeProxyFetch(proxyUrl) : fetch;
+  const base = `${TELEGRAM_API_BASE}/bot${token}`;
+
+  const result: TelegramProbe = {
+    ok: false,
+    status: null,
+    error: null,
+    elapsedMs: 0,
+  };
+
+  try {
+    const meRes = await fetchWithTimeout(`${base}/getMe`, timeoutMs, fetcher);
+    const meJson = (await meRes.json()) as {
+      ok?: boolean;
+      description?: string;
+      result?: { id?: number; username?: string };
+    };
+    if (!meRes.ok || !meJson?.ok) {
+      result.status = meRes.status;
+      result.error = meJson?.description ?? `getMe failed (${meRes.status})`;
+      return { ...result, elapsedMs: Date.now() - started };
+    }
+
+    result.bot = {
+      id: meJson.result?.id ?? null,
+      username: meJson.result?.username ?? null,
+    };
+
+    // Try to fetch webhook info, but don't fail health if it errors.
+    try {
+      const webhookRes = await fetchWithTimeout(
+        `${base}/getWebhookInfo`,
+        timeoutMs,
+        fetcher,
+      );
+      const webhookJson = (await webhookRes.json()) as {
+        ok?: boolean;
+        result?: { url?: string; has_custom_certificate?: boolean };
+      };
+      if (webhookRes.ok && webhookJson?.ok) {
+        result.webhook = {
+          url: webhookJson.result?.url ?? null,
+          hasCustomCert: webhookJson.result?.has_custom_certificate ?? null,
+        };
+      }
+    } catch {
+      // ignore webhook errors for probe
+    }
+
+    result.ok = true;
+    result.status = null;
+    result.error = null;
+    result.elapsedMs = Date.now() - started;
+    return result;
+  } catch (err) {
+    return {
+      ...result,
+      status: err instanceof Response ? err.status : result.status,
+      error: err instanceof Error ? err.message : String(err),
+      elapsedMs: Date.now() - started,
+    };
+  }
+}