feat(0.2.1): 单端口生产架构 —— /sync 同域反代 (去掉 13002 独立同步端口), 新增 deploy/prod 生产编排

server/powersync-proxy.js

@@ -0,0 +1,54 @@
+// PowerSync 同域反代 (0.2.1): 把 /sync、/socket 转发到内网同步服务,
+// 对外只暴露应用本身一个端口 (无需单独的 powersync 端口)。
+// - 未配置 POWERSYNC_UPSTREAM 时直接跳过 (本地开发/无同步服务时行为不变)
+// - 必须挂在 express.json()/cors 之前: 同步走长连接流式响应, 不能被 body 解析打断
+import http from 'node:http'
+import https from 'node:https'
+
+const PREFIXES = ['/sync', '/socket']
+
+export function powersyncProxy() {
+  const upstream = process.env.POWERSYNC_UPSTREAM
+  if (!upstream) return (_req, _res, next) => next()
+
+  let target
+  try {
+    target = new URL(upstream)
+  } catch {
+    console.error('[powersync-proxy] POWERSYNC_UPSTREAM 非法:', upstream)
+    return (_req, _res, next) => next()
+  }
+  const transport = target.protocol === 'https:' ? https : http
+  const basePort = Number(target.port) || (target.protocol === 'https:' ? 443 : 80)
+  console.log('[powersync-proxy] 同步请求转发到', target.origin)
+
+  return (req, res, next) => {
+    if (!PREFIXES.some((p) => req.url === p || req.url.startsWith(p + '/') || req.url.startsWith(p + '?'))) {
+      return next()
+    }
+    const headers = { ...req.headers, host: target.host }
+    const upstreamReq = transport.request(
+      {
+        protocol: target.protocol,
+        hostname: target.hostname,
+        port: basePort,
+        method: req.method,
+        path: req.url,
+        headers,
+      },
+      (upstreamRes) => {
+        res.writeHead(upstreamRes.statusCode || 502, upstreamRes.headers)
+        upstreamRes.pipe(res)
+      },
+    )
+    upstreamReq.on('error', (e) => {
+      console.error('[powersync-proxy] 转发失败:', e.message)
+      if (!res.headersSent) res.writeHead(502, { 'content-type': 'text/plain' })
+      res.end('powersync upstream error')
+    })
+    // 长连接: 客户端断开时同步断开上游
+    req.on('aborted', () => upstreamReq.destroy())
+    res.on('close', () => upstreamReq.destroy())
+    req.pipe(upstreamReq)
+  }
+}