From 405c6b8538152168ea516e110bc437421bc6a83f Mon Sep 17 00:00:00 2001
From: JounQin <admin@1stg.me>
Date: Mon, 5 Feb 2024 18:01:55 +0800
Subject: [PATCH] fix: handle upstream response error

---
 README.md                      |  6 +++---
 api/[owner]/[app]/[version].ts | 26 +++++++++++++++++++++++---
 2 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/README.md b/README.md
index 221ee413..4086244c 100644
--- a/README.md
+++ b/README.md
@@ -8,15 +8,15 @@ Stable link that redirects to unstable [App Center][] download link via Vercel.
 
 ## Examples
 
-1. `ClashX Pro`: https://appcenter.vercel.app/clashx/clashx-pro/1.30.3.2
-
-2. `Timeless`: The followings version and short version are both fine.
+1. `Timeless`: The followings version and short version are both fine.
 
    - https://appcenter.vercel.app/dangercove/timeless/2020.7
    - https://appcenter.vercel.app/dangercove/timeless/37
 
    ![Timeless](https://user-images.githubusercontent.com/8336744/98822766-30e03500-246c-11eb-8cab-f7c31d196f5a.png)
 
+2. ~~`ClashX Pro`: https://appcenter.vercel.app/clashx/clashx-pro/1.30.3.2~~ (The source project is not available anymore.)
+
 ## Sponsors
 
 | 1stG                                                                                                                               | RxTS                                                                                                                               | UnTS                                                                                                                               |
diff --git a/api/[owner]/[app]/[version].ts b/api/[owner]/[app]/[version].ts
index 558d2742..fa115e72 100644
--- a/api/[owner]/[app]/[version].ts
+++ b/api/[owner]/[app]/[version].ts
@@ -4,6 +4,11 @@ export interface ReleaseInfo {
   short_version: string
 }
 
+export interface ErrorResponse {
+  code: string
+  message: string
+}
+
 export interface DownloadInfo {
   download_url: string
 }
@@ -40,7 +45,14 @@ export default async (req: Request): Promise<Response> => {
   console.log(`Fetching ${releasesUrl}`)
 
   const releasesRes = await fetch(releasesUrl, FETCH_OPTIONS)
-  const releases = (await releasesRes.json()) as ReleaseInfo[]
+
+  const releases = (await releasesRes.clone().json()) as
+    | ErrorResponse
+    | ReleaseInfo[]
+
+  if (!releasesRes.ok || !Array.isArray(releases)) {
+    return releasesRes
+  }
 
   const matched = releases.find(
     it => it.version === version || it.short_version === version,
@@ -60,8 +72,16 @@ export default async (req: Request): Promise<Response> => {
   console.log(`Fetching ${releaseUrl}`)
 
   const downloadInfoRes = await fetch(releaseUrl, FETCH_OPTIONS)
-  const { download_url: downloadUrl } =
-    (await downloadInfoRes.json()) as DownloadInfo
+
+  const downloadInfo = (await downloadInfoRes.json()) as
+    | DownloadInfo
+    | ErrorResponse
+
+  if (!downloadInfoRes.ok) {
+    return downloadInfoRes
+  }
+
+  const { download_url: downloadUrl } = downloadInfo as DownloadInfo
 
   console.log(`Redirect to ${downloadUrl}`)