0.3.3 外网下载修复

wolai-frontend/src/app/api/media/signed-url/route.ts

@@ -4,6 +4,41 @@ import { HttpError, requireAuthContext } from "@/lib/auth/authContext";
 
 export const dynamic = "force-dynamic";
 
+const base64UrlEncodeUtf8 = (input: string) => {
+  return Buffer.from(input, "utf8")
+    .toString("base64")
+    .replace(/\+/g, "-")
+    .replace(/\//g, "_")
+    .replace(/=+$/g, "");
+};
+
+const getRequestOrigin = (request: Request) => {
+  const xfProto = request.headers.get("x-forwarded-proto")?.split(",")[0]?.trim();
+  const xfHost = request.headers.get("x-forwarded-host")?.split(",")[0]?.trim();
+  const host = xfHost || request.headers.get("host") || new URL(request.url).host;
+  const protocol = (xfProto || new URL(request.url).protocol.replace(/:$/, "")) + ":";
+  return `${protocol}//${host}`;
+};
+
+const isLocalHostname = (hostname: string) =>
+  hostname === "127.0.0.1" || hostname === "localhost" || hostname === "host.docker.internal";
+
+const maybeProxyForBrowser = (request: Request, rawUrl: string) => {
+  const input = String(rawUrl || "").trim();
+  if (!input) return input;
+  if (input.startsWith("/api/onlyoffice/proxy")) return input;
+  try {
+    const u = new URL(input);
+    if (!isLocalHostname(u.hostname)) return input;
+    const origin = getRequestOrigin(request);
+    const proxy = new URL("/api/onlyoffice/proxy", origin);
+    proxy.searchParams.set("u", base64UrlEncodeUtf8(input));
+    return proxy.toString();
+  } catch {
+    return input;
+  }
+};
+
 export async function GET(request: Request) {
   if (isConvexEnabled()) {
     try {
@@ -23,9 +58,8 @@ export async function GET(request: Request) {
 
     // 说明：Convex + MinIO 模式下，这个接口目前主要用于“外链文件”走 ONLYOFFICE 的场景。
     // 由于外链本身已经是可访问的 URL，这里只做最小透传。
-    return NextResponse.json({ signedUrl: fileUrl });
+    return NextResponse.json({ signedUrl: maybeProxyForBrowser(request, fileUrl) });
   }
 
   return NextResponse.json({ error: "当前仅支持 Convex 模式" }, { status: 501 });
 }
-