fix CF error on alias storages. (#2)

Enabling proxy on both of the alias and real storages is causing errors like too many redirects or SSL handshake failed 525 when trying to download

src/const.ts

@@ -1,2 +1,3 @@
 export const ADDRESS = "YOUR_ADDRESS";
-export const TOKEN = "YOUR_TOKEN";
+export const TOKEN = "YOUR_TOKEN";
+export const WORKER_ADDRESS = "YOUR_WORKER_ADDRESS";

src/handleDownload.ts

@@ -1,5 +1,6 @@
-import { ADDRESS, TOKEN } from "./const";
+import { ADDRESS, TOKEN, WORKER_ADDRESS } from "./const";
 import { verify } from "./verify";
+import { handleRequest } from "./handleRequest";
 
 export async function handleDownload(request: Request) {
   const origin = request.headers.get("origin") ?? "*";
@@ -38,7 +39,6 @@ export async function handleDownload(request: Request) {
     return new Response(JSON.stringify(res));
   }
   request = new Request(res.data.url, request);
-  request = new Request(request, { redirect: "follow" });
   if (res.data.header) {
     for (const k in res.data.header) {
       for (const v of res.data.header[k]) {
@@ -47,6 +47,20 @@ export async function handleDownload(request: Request) {
     }
   }
   let response = await fetch(request);
+  while (response.status >= 300 && response.status < 400) {
+    const location = response.headers.get("Location");
+    if (location) {
+      if (location.startsWith(`${WORKER_ADDRESS}/`)) {
+        request = new Request(location, request);
+        return await handleRequest(request);
+      } else {
+        request = new Request(location, request);
+        response = await fetch(request);
+      }
+    } else {
+      break;
+    }
+  }
   // Recreate the response so we can modify the headers
   response = new Response(response.body, response);
   response.headers.delete("set-cookie");

src/handleRequest.ts

@@ -0,0 +1,9 @@
+import { handleDownload } from "./handleDownload";
+import { handleOptions } from "./handleOptions";
+
+export async function handleRequest(request: Request) {
+    if (request.method === "OPTIONS") {
+        return handleOptions(request);
+    }
+    return await handleDownload(request);
+}

src/index.ts

@@ -1,5 +1,4 @@
-import { handleDownload } from "./handleDownload";
-import { handleOptions } from "./handleOptions";
+import { handleRequest } from "./handleRequest";
 
 export interface Env {
   // Example binding to KV. Learn more at https://developers.cloudflare.com/workers/runtime-apis/kv/
@@ -18,9 +17,6 @@ export default {
     env: Env,
     ctx: ExecutionContext
   ): Promise<Response> {
-    if (request.method === "OPTIONS") {
-      return handleOptions(request);
-    }
-    return handleDownload(request);
+    return await handleRequest(request);
   },
 };