From b467df07d29c2f2cb992981cea59dcda26c7bc3a Mon Sep 17 00:00:00 2001
From: Yufan Sheng <syhily@gmail.com>
Date: Tue, 25 Jun 2024 21:08:44 +0800
Subject: [PATCH] feat: add avatar fetch for cdn with origin limit.

---
 src/pages/avatar/[hash].png.ts | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/src/pages/avatar/[hash].png.ts b/src/pages/avatar/[hash].png.ts
index 45d3138..ad8ccf1 100644
--- a/src/pages/avatar/[hash].png.ts
+++ b/src/pages/avatar/[hash].png.ts
@@ -1,7 +1,7 @@
 import { queryEmail } from '@/helpers/db/query';
 import { encodedEmail, urlJoin } from '@/helpers/tools';
 import options from '@/options';
-import type { APIRoute } from 'astro';
+import type { APIRoute, ValidRedirectStatus } from 'astro';
 
 const defaultAvatar = (): string => {
   return urlJoin(options.assetsPrefix(), '/images/default-avatar.png');
@@ -11,12 +11,22 @@ function isNumeric(str: string) {
   return !Number.isNaN(str) && !Number.isNaN(Number.parseFloat(str));
 }
 
-const avatarImage = async (hash: string): Promise<Response> => {
+const avatarImage = async (
+  hash: string,
+  redirect: (path: string, status?: ValidRedirectStatus) => Response,
+): Promise<Response> => {
+  const defaultAvatarLink = defaultAvatar();
   const link = urlJoin(
     options.settings.comments.avatar.mirror,
-    `${hash}.png?s=${options.settings.comments.avatar.size}&d=${defaultAvatar()}`,
+    `${hash}.png?s=${options.settings.comments.avatar.size}&d=${defaultAvatarLink}`,
   );
-  return new Response(Buffer.from(await (await fetch(link)).arrayBuffer()), {
+
+  const resp = await fetch(link, { redirect: 'manual', headers: { Referer: options.website } });
+  if (resp.headers.get('location') === defaultAvatarLink) {
+    return redirect(defaultAvatarLink, 302);
+  }
+
+  return new Response(Buffer.from(await resp.arrayBuffer()), {
     headers: { 'Content-Type': 'image/png' },
   });
 };
@@ -33,8 +43,8 @@ export const GET: APIRoute = async ({ params, redirect }) => {
     if (email === null) {
       return redirect(defaultAvatar());
     }
-    return avatarImage(encodedEmail(email));
+    return avatarImage(encodedEmail(email), redirect);
   }
 
-  return avatarImage(hash);
+  return avatarImage(hash, redirect);
 };