Fix dashboard redirects leaking internal port

apps/dashboard/src/middleware.ts

@@ -38,16 +38,27 @@ function resolveProxyUrl(req: NextRequest, pathname: string): URL {
   if (forwardedHost && !isInternalHost(forwardedHost)) {
     url.host = forwardedHost
     url.protocol = (forwardedProto ?? 'http') + ':'
+    if (!hasExplicitPort(forwardedHost) || isInternalAppPort(url.port)) url.port = ''
   } else if (!isInternalHost(req.nextUrl.host)) {
     url.host = req.nextUrl.host
     url.protocol = req.nextUrl.protocol
+    if (!hasExplicitPort(req.nextUrl.host) || isInternalAppPort(url.port)) url.port = ''
   } else {
     url.host = storefrontOrigin.host
     url.protocol = storefrontOrigin.protocol
+    if (!hasExplicitPort(storefrontOrigin.host) || isInternalAppPort(url.port)) url.port = ''
   }
   return url
 }
 
+function hasExplicitPort(host: string): boolean {
+  return /^[^:]+:\d+$/.test(host)
+}
+
+function isInternalAppPort(port: string): boolean {
+  return ['3000', '3001', '3002', '3004', '4000'].includes(port)
+}
+
 function isInternalHost(host: string | null): boolean {
   if (!host) return false
   const hostname = host.split(':')[0]?.toLowerCase()