Fix s3MetaToAzureProperties Content-Md5 key (#5068)

cmd/gateway-azure.go

@@ -101,7 +101,7 @@ func s3MetaToAzureProperties(s3Metadata map[string]string) (storage.BlobMetadata
 		case k == "Content-Length":
 			// assume this doesn't fail
 			props.ContentLength, _ = strconv.ParseInt(v, 10, 64)
-		case k == "Content-MD5":
+		case k == "Content-Md5":
 			props.ContentMD5 = v
 		case k == "Content-Type":
 			props.ContentType = v

cmd/gateway-azure_test.go

@@ -82,6 +82,17 @@ func TestS3MetaToAzureProperties(t *testing.T) {
 			t.Fatalf("Test failed with unexpected error %s, expected UnsupportedMetadata", err)
 		}
 	}
+
+	headers = map[string]string{
+		"content-md5": "Dce7bmCX61zvxzP5QmfelQ==",
+	}
+	_, props, err := s3MetaToAzureProperties(headers)
+	if err != nil {
+		t.Fatalf("Test failed, with %s", err)
+	}
+	if props.ContentMD5 != headers["content-md5"] {
+		t.Fatalf("Test failed, expected %s, got %s", headers["content-md5"], props.ContentMD5)
+	}
 }
 
 func TestAzurePropertiesToS3Meta(t *testing.T) {