0.2 在线版本打通

wolai-frontend/src/app/cache/[...path]/route.ts

@@ -0,0 +1,86 @@
+import type { NextRequest } from "next/server";
+import { NextResponse } from "next/server";
+
+export const dynamic = "force-dynamic";
+
+// 说明：ONLYOFFICE 文档服务器在编辑过程中会从 `/cache/*` 拉取二进制缓存（例如 Editor.bin）。
+// 当我们通过 `/onlyoffice-server/*` 反代文档服务器时，这些 `/cache/*` 请求会落到 Next 上，
+// 若未额外反代，会导致 404，进而触发 ONLYOFFICE “下载失败（-4）/无法打开文档”。
+// 因此这里把 `/cache/*` 同样反代到本机 ONLYOFFICE。
+const ONLYOFFICE_INTERNAL_URL = (process.env.ONLYOFFICE_INTERNAL_URL || "http://127.0.0.1:8081").replace(
+  /\/+$/,
+  "",
+);
+
+const stripHopByHopHeaders = (headers: Headers) => {
+  // 说明：Hop-by-hop headers 不应被代理转发/透传
+  const hopByHop = [
+    "connection",
+    "keep-alive",
+    "proxy-authenticate",
+    "proxy-authorization",
+    "te",
+    "trailer",
+    "transfer-encoding",
+    "upgrade",
+  ];
+  for (const key of hopByHop) {
+    headers.delete(key);
+  }
+};
+
+const proxyCache = async (request: NextRequest, pathParts: string[]) => {
+  const incomingUrl = new URL(request.url);
+  const target = new URL(
+    `${ONLYOFFICE_INTERNAL_URL}/cache/${(pathParts ?? []).map(encodeURIComponent).join("/")}`,
+  );
+  target.search = incomingUrl.search;
+
+  const headers = new Headers(request.headers);
+  headers.delete("host");
+  // 说明：避免上游 gzip 后被自动解压但仍带 content-encoding，导致浏览器二次解压错误
+  headers.set("accept-encoding", "identity");
+  stripHopByHopHeaders(headers);
+
+  const method = request.method.toUpperCase();
+  const hasBody = !["GET", "HEAD"].includes(method);
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const init: any = {
+    method,
+    headers,
+    body: hasBody ? request.body : undefined,
+    duplex: "half",
+    redirect: "follow",
+  };
+
+  const upstream = await fetch(target, init);
+
+  const outHeaders = new Headers(upstream.headers);
+  stripHopByHopHeaders(outHeaders);
+  outHeaders.delete("content-encoding");
+  outHeaders.delete("content-length");
+
+  return new NextResponse(upstream.body, {
+    status: upstream.status,
+    headers: outHeaders,
+  });
+};
+
+type RouteCtx = { params: Promise<{ path: string[] }> };
+
+export async function GET(request: NextRequest, ctx: RouteCtx) {
+  const { path } = await ctx.params;
+  return proxyCache(request, path ?? []);
+}
+
+export async function HEAD(request: NextRequest, ctx: RouteCtx) {
+  const { path } = await ctx.params;
+  return proxyCache(request, path ?? []);
+}
+
+export async function OPTIONS(request: NextRequest, ctx: RouteCtx) {
+  const { path } = await ctx.params;
+  return proxyCache(request, path ?? []);
+}
+