don't fallback to english to prevent cache layer DoS

contrib/backends/srndv2/src/srnd/i18n.go

@@ -7,6 +7,7 @@ import (
 	"log"
 	"path/filepath"
 	"strings"
+	"errors"
 )
 
 type I18N struct {
@@ -22,6 +23,7 @@ type I18N struct {
 }
 
 var I18nProvider *I18N = nil
+var ErrNoLang = errors.New("no such language")
 
 //Read all .ini files in dir, where the filenames are BCP 47 tags
 //Use the language matcher to get the best match for the locale preference
@@ -41,17 +43,23 @@ func NewI18n(locale, dir string) (*I18N, error) {
 		return nil, err
 	}
 
+	found:= false
 	serverLangs := make([]language.Tag, 1)
-	serverLangs[0] = language.AmericanEnglish // en-US fallback
+	//	serverLangs[0] = language.AmericanEnglish // en-US fallback
 	for _, file := range files {
 		if filepath.Ext(file.Name()) == ".ini" {
 			name := strings.TrimSuffix(file.Name(), ".ini")
 			tag, err := language.Parse(name)
 			if err == nil {
 				serverLangs = append(serverLangs, tag)
+				found = true;
 			}
 		}
 	}
+	if !found {
+		return nil, ErrNoLang
+	}
+	
 	matcher := language.NewMatcher(serverLangs)
 	tag, _, _ := matcher.Match(pref)
 

contrib/backends/srndv2/src/srnd/null_cache.go

@@ -51,6 +51,7 @@ func (self *nullHandler) GetI18N(r *http.Request) *I18N {
 		i, err = NewI18n(lang, self.translations)
 		if err != nil {
 			log.Println(err)
+			return nil
 		}
 		if i != nil {
 			self.i18n[lang] = i
@@ -64,7 +65,10 @@ func (self *nullHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 	sfw := strings.Count(r.URL.RawQuery, "sfw=1") > 0
 	i18n := self.GetI18N(r)
-
+	if i18n == nil {
+		http.Redirect(w, r, r.URL.Path, http.StatusFound)
+		return
+	}
 	path := r.URL.Path
 	_, file := filepath.Split(path)
 

contrib/static/krane.css

@@ -544,3 +544,10 @@ background-repeat: repeat;
 :target {
     background-color: #493769;
 }
+
+body {
+    display: inline-flex;
+    flex-direction: column;
+    flex-wrap: wrap;
+    flex-flow: wrap;
+}