Added basic template rendering.

util/lang.go

@@ -0,0 +1,39 @@
+package util
+
+import (
+	iso6391 "github.com/emvi/iso-639-1"
+	"net/http"
+	"strings"
+)
+
+var (
+	supportedLangCodes = map[string]bool{"de": true}
+	defaultLangCode    = "de"
+)
+
+func getLangCodeFromHeader(r *http.Request) string {
+	header := r.Header.Get("Accept-Language")
+	parts := strings.Split(header, ";")
+
+	if len(parts) == 0 || len(parts[0]) < 2 {
+		return defaultLangCode
+	}
+
+	code := strings.ToLower(parts[0][:2])
+
+	if iso6391.ValidCode(code) {
+		return code
+	}
+
+	return defaultLangCode
+}
+
+func GetLangCode(r *http.Request) string {
+	langCode := getLangCodeFromHeader(r)
+
+	if _, ok := supportedLangCodes[langCode]; ok {
+		return langCode
+	}
+
+	return defaultLangCode
+}