add error message for filename with non-ascii chars

cmd/media.go

@@ -48,6 +48,10 @@ func handleUploadMedia(c echo.Context) error {
 		ext         = strings.TrimPrefix(strings.ToLower(filepath.Ext(file.Filename)), ".")
 		contentType = file.Header.Get("Content-Type")
 	)
+	if !isASCII(file.Filename) {
+		return echo.NewHTTPError(http.StatusUnprocessableEntity,
+			app.i18n.Ts("media.invalidFileName", "name", file.Filename))
+	}
 
 	// Validate file extension.
 	if !inArray("*", app.constants.MediaUpload.Extensions) {

cmd/utils.go

@@ -8,6 +8,7 @@ import (
 	"regexp"
 	"strconv"
 	"strings"
+	"unicode"
 )
 
 var (
@@ -113,3 +114,12 @@ func titleCase(input string) string {
 
 	return strings.Join(parts, " ")
 }
+
+func isASCII(s string) bool {
+	for _, c := range s {
+		if c > unicode.MaxASCII {
+			return false
+		}
+	}
+	return true
+}

i18n/en.json

@@ -288,6 +288,7 @@
     "media.errorSavingThumbnail": "Error saving thumbnail: {error}",
     "media.errorUploading": "Error uploading file: {error}",
     "media.invalidFile": "Invalid file: {error}",
+    "media.invalidFileName": "Invalid filename {name}. Use only ASCII characters",
     "media.title": "Media",
     "media.unsupportedFileType": "Unsupported file type ({type})",
     "media.upload": "Upload",