From 25e012d30b3746015e2c41a2137ef8522dec8d12 Mon Sep 17 00:00:00 2001
From: famosss <zzq09494@ly.com>
Date: Tue, 25 Oct 2022 08:29:52 +0800
Subject: [PATCH] fix: set user metadata key to lowercase (#3894)

* fix: set user metadata key to lowercase

* feat: simplify a bit
---
 weed/s3api/s3api_object_handlers.go | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/weed/s3api/s3api_object_handlers.go b/weed/s3api/s3api_object_handlers.go
index 8c4e3f0e8..37851b147 100644
--- a/weed/s3api/s3api_object_handlers.go
+++ b/weed/s3api/s3api_object_handlers.go
@@ -409,10 +409,22 @@ func (s3a *S3ApiServer) proxyToFiler(w http.ResponseWriter, r *http.Request, des
 		return
 	}
 
+	setUserMetadataKeyToLowercase(resp)
+
 	responseStatusCode := responseFn(resp, w)
 	s3err.PostLog(r, responseStatusCode, s3err.ErrNone)
 }
 
+func setUserMetadataKeyToLowercase(resp *http.Response) {
+	for key, value := range resp.Header {
+		if strings.HasPrefix(key, s3_constants.AmzUserMetaPrefix) {
+			resp.Header[strings.ToLower(key)] = value
+			delete(resp.Header,key)
+			continue
+		}
+	}
+}
+
 func passThroughResponse(proxyResponse *http.Response, w http.ResponseWriter) (statusCode int) {
 	for k, v := range proxyResponse.Header {
 		w.Header()[k] = v