Progression in styles + initiate translation process

[vchess.git] / routes / all.js

diff --git a/routes/all.js b/routes/all.js
index d5b4e56..b231813 100644 (file)
--- a/routes/all.js
+++ b/routes/all.js
@@ -5,6 +5,33 @@ const sqlite3 = require('sqlite3');//.verbose();
 const db = new sqlite3.Database('db/vchess.sqlite');
 const sanitizeHtml = require('sanitize-html');
 
+const supportedLang = ["fr","en"];
+function selectLanguage(req, res)
+{
+       // If preferred language already set:
+       if (!!req.cookies["lang"])
+               return req.cookies["lang"];
+
+       // Else: search and set it
+       const langString = req.headers["accept-language"];
+       let langArray = langString
+               .replace(/;q=[0-9.]+/g, "") //priority
+               .replace(/-[A-Z]+/g, "") //region (skipped for now...)
+               .split(",") //may have some duplicates, but removal is too costly
+       let bestLang = "en"; //default: English
+       for (let lang of langArray)
+       {
+               if (supportedLang.includes(lang))
+               {
+                       bestLang = lang;
+                       break;
+               }
+       }
+       // Cookie expires in 183 days (expressed in milliseconds)
+       res.cookie('lang', bestLang, { maxAge: 183*24*3600*1000 });
+       return bestLang;
+}
+
 // Home
 router.get('/', function(req, res, next) {
        db.serialize(function() {
@@ -13,7 +40,9 @@ router.get('/', function(req, res, next) {
                                return next(err);
                        res.render('index', {
                                title: 'club',
-                               variantArray: variants, //JSON.stringify(variants)
+                               variantArray: variants,
+                               lang: selectLanguage(req, res),
+                               languages: supportedLang,
                        });
                });
        });
@@ -48,7 +77,8 @@ router.get("/:vname([a-zA-Z0-9]+)", (req,res,next) => {
 router.get("/rules/:variant([a-zA-Z0-9]+)", (req,res) => {
        if (!req.xhr)
                return res.json({errmsg: "Unauthorized access"});
-       res.render("rules/" + req.params["variant"]);
+       const lang = selectLanguage(req, res);
+       res.render("rules/" + req.params["variant"] + "/" + lang);
 });
 
 // Fetch 10 previous or next problems (AJAX)