convert file names to lowercase

server/webserver/handlers/upload.go

@@ -3,6 +3,7 @@ package handlers
 import (
 	"io"
 	"os"
+	"strings"
 
 	"net/http"
 
@@ -41,6 +42,9 @@ func FileUpload(w http.ResponseWriter, r *http.Request) {
 		os.Mkdir(config.Config.SoundsPath, os.ModePerm)
 	}
 
+	// convert file name to lower case
+	header.Filename = strings.ToLower(header.Filename)
+
 	// check if file already exists
 	if _, err := os.Stat(config.Config.SoundsPath + header.Filename); err == nil {
 		response.ERR(w, http.StatusInternalServerError, []byte("File already exists."))