From 48af68b05a32f5da596f79172a610418e6ebc479 Mon Sep 17 00:00:00 2001
From: carl chen <ccheartszzz@gmail.com>
Date: Sat, 12 Sep 2026 19:12:48 +0800
Subject: [PATCH] fix: preserve trailing slashes in mirror redirects

---
 src/mirror-redirect/index.ts | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/mirror-redirect/index.ts b/src/mirror-redirect/index.ts
index 8ab9199..289cfb1 100644
--- a/src/mirror-redirect/index.ts
+++ b/src/mirror-redirect/index.ts
@@ -221,9 +221,17 @@ function hostMatches(hostname: string, matcher: HostnameMatcher): boolean {
 function toCnSuffixPathname(pathname: string): string {
   if (pathname === '/' || pathname === '')
     return '/index-cn'
-  if (pathname.startsWith('/~demos') || pathname.endsWith('-cn'))
+
+  // Append the suffix to the path segment, not after its trailing slash.
+  // Strip the slash while checking/appending `-cn`, then restore it.
+  const hasTrailingSlash = pathname.endsWith('/')
+  const normalizedPathname = hasTrailingSlash ? pathname.slice(0, -1) : pathname
+
+  if (normalizedPathname.startsWith('/~demos') || normalizedPathname.endsWith('-cn'))
     return pathname
-  return `${pathname}-cn`
+
+  const suffixedPathname = `${normalizedPathname}-cn`
+  return hasTrailingSlash ? `${suffixedPathname}/` : suffixedPathname
 }
 
 function readStorage(key: string): string | null {