Add automatic language redirector

src/server/languageRedirect.js

@@ -0,0 +1,37 @@
+const config = require("../../config"), locale = require("locale");
+
+let supported = new locale.Locales(conifg.languages);
+let defaultLang = "en";
+
+export default ({ Router }) => {
+    Router.on("*", checkLang);
+};
+
+async function checkLang({ request }) {
+    const { url } = request
+
+    let requestURL = new URL(url);
+
+    config.languages.forEach((language) => {
+        if(requestURL.pathname.startsWith("/"+language+"/")) {
+            return;
+        }
+    });
+
+    let headers = request.headers;
+
+    let selectedLanguage = defaultLang;
+
+    if(headers.has("Accept-Language")) {
+        let languageHeader = headers.get("Accept-Language");
+
+        let requestLocales = new locale.Locales(languageHeader);
+
+        selectedLanguage = requestLocales.best(supported);
+    }
+    
+    requestURL.pathname = "/"+selectedLanguage+requestURL.pathname;
+        
+    return Response.redirect(requestURL.toString(), 302);
+  }
+