feat(history): establish Telegram SaaS platform foundation

server/src/gateway.js

@@ -0,0 +1,79 @@
+const base = () => (process.env.TELEGRAM_GATEWAY_URL || 'http://host.docker.internal:3000/api').replace(/\/$/, '')
+
+let gatewayToken = process.env.TELEGRAM_GATEWAY_TOKEN || ''
+let refreshPromise
+
+function tokenExpiresSoon(token) {
+  try {
+    const payload = JSON.parse(Buffer.from(token.split('.')[1], 'base64url').toString('utf8'))
+    return !payload.exp || payload.exp * 1000 < Date.now() + 5 * 60 * 1000
+  } catch {
+    return true
+  }
+}
+
+async function refreshGatewayToken() {
+  if (refreshPromise) return refreshPromise
+  refreshPromise = (async () => {
+    const email = process.env.TELEGRAM_GATEWAY_SERVICE_EMAIL
+    const password = process.env.TELEGRAM_GATEWAY_SERVICE_PASSWORD
+    const tenantId = process.env.TELEGRAM_GATEWAY_TENANT_ID
+    if (!email || !password || !tenantId) {
+      throw Object.assign(new Error('Telegram 网关服务账号凭据尚未配置'), { status: 503 })
+    }
+    const response = await fetch(`${base()}/auth/login`, {
+      method: 'POST',
+      headers: { 'content-type': 'application/json' },
+      body: JSON.stringify({ email, password, tenantId }),
+    })
+    const raw = await response.text()
+    let result
+    try { result = raw ? JSON.parse(raw) : null } catch { result = raw }
+    const token = result?.data?.token || result?.token
+    if (!response.ok || !token) {
+      throw Object.assign(new Error(result?.message || 'Telegram 网关服务账号续签失败'), { status: response.status || 503 })
+    }
+    gatewayToken = token
+    return token
+  })().finally(() => { refreshPromise = undefined })
+  return refreshPromise
+}
+
+export async function gatewayRequest(path, options = {}) {
+  const tenantId = process.env.TELEGRAM_GATEWAY_TENANT_ID
+  if (!tenantId) throw Object.assign(new Error('Telegram 网关租户尚未配置'), { status: 503 })
+  if (!gatewayToken || tokenExpiresSoon(gatewayToken)) await refreshGatewayToken()
+  const send = () => fetch(`${base()}${path}`, {
+    ...options,
+    headers: {
+      ...(options.body instanceof FormData ? {} : { 'content-type': 'application/json' }),
+      authorization: `Bearer ${gatewayToken}`,
+      'x-tenant-id': tenantId,
+      ...(options.headers || {}),
+    },
+  })
+  let response = await send()
+  if (response.status === 401) {
+    await refreshGatewayToken()
+    response = await send()
+  }
+  const raw = await response.text()
+  let result
+  try { result = raw ? JSON.parse(raw) : null } catch { result = raw }
+  if (!response.ok) {
+    throw Object.assign(new Error(result?.message || `Telegram 网关请求失败 (${response.status})`), { status: response.status })
+  }
+  return result?.data ?? result
+}
+
+export function postGateway(path, body) {
+  return gatewayRequest(path, { method: 'POST', body: JSON.stringify(body) })
+}
+
+export function putGateway(path, body) {
+  return gatewayRequest(path, { method: 'PUT', body: JSON.stringify(body) })
+}
+
+export function uploadGateway(path, formData) {
+  return gatewayRequest(path, { method: 'POST', body: formData })
+}