From e8fa89e8348522c368eb17e89ab3209e6a734088 Mon Sep 17 00:00:00 2001
From: Alex Auvolat <lx@deuxfleurs.fr>
Date: Mon, 27 Jan 2025 19:58:06 +0100
Subject: [PATCH] s3 api: make x-amz-meta-* headers lowercase (fix #844)

---
 src/api/s3/get.rs | 13 +++++--------
 src/api/s3/put.rs |  2 +-
 2 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/src/api/s3/get.rs b/src/api/s3/get.rs
index f5d3cf11..f61aae11 100644
--- a/src/api/s3/get.rs
+++ b/src/api/s3/get.rs
@@ -68,14 +68,11 @@ fn object_headers(
 	// See: https://docs.aws.amazon.com/AmazonS3/latest/userguide/UsingMetadata.html
 	let mut headers_by_name = BTreeMap::new();
 	for (name, value) in meta_inner.headers.iter() {
-		match headers_by_name.get_mut(name) {
-			None => {
-				headers_by_name.insert(name, vec![value.as_str()]);
-			}
-			Some(headers) => {
-				headers.push(value.as_str());
-			}
-		}
+		let name_lower = name.to_ascii_lowercase();
+		headers_by_name
+			.entry(name_lower)
+			.or_insert(vec![])
+			.push(value.as_str());
 	}
 
 	for (name, values) in headers_by_name {
diff --git a/src/api/s3/put.rs b/src/api/s3/put.rs
index 1e3b1b44..bfb0dc9b 100644
--- a/src/api/s3/put.rs
+++ b/src/api/s3/put.rs
@@ -622,7 +622,7 @@ pub(crate) fn get_headers(headers: &HeaderMap<HeaderValue>) -> Result<HeaderList
 	for (name, value) in headers.iter() {
 		if name.as_str().starts_with("x-amz-meta-") {
 			ret.push((
-				name.to_string(),
+				name.as_str().to_ascii_lowercase(),
 				std::str::from_utf8(value.as_bytes())?.to_string(),
 			));
 		}