Advance on Spanish translation (still 13 rules to translate)

[vchess.git] / routes / all.js

diff --git a/routes/all.js b/routes/all.js
index b966532..79f7c3d 100644 (file)
--- a/routes/all.js
+++ b/routes/all.js
@@ -2,8 +2,37 @@ let express = require('express');
 let router = express.Router();
 const createError = require('http-errors');
 const sqlite3 = require('sqlite3');//.verbose();
-const db = new sqlite3.Database('db/vchess.sqlite');
+const DbPath = __dirname.replace("/routes", "/db/vchess.sqlite");
+const db = new sqlite3.Database(DbPath);
 const sanitizeHtml = require('sanitize-html');
+const MaxNbProblems = 20;
+
+const supportedLang = ["en","es","fr"];
+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) {
@@ -13,33 +42,39 @@ 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,
                        });
                });
        });
 });
 
 // Variant
-router.get("/:vname([a-zA-Z0-9]+)", (req,res,next) => {
-       const vname = req.params["vname"];
+router.get("/:variant([a-zA-Z0-9]+)", (req,res,next) => {
+       const vname = req.params["variant"];
        db.serialize(function() {
                db.all("SELECT * FROM Variants WHERE name='" + vname + "'", (err,variant) => {
                        if (!!err)
                                return next(err);
                        if (!variant || variant.length==0)
                                return next(createError(404));
-                       // TODO (later...) get only n=100(?) most recent problems
-                       db.all("SELECT * FROM Problems WHERE variant='" + vname + "'",
-                               (err2,problems) => {
-                                       if (!!err2)
-                                               return next(err2);
-                                       res.render('variant', {
-                                               title: vname + ' Variant',
-                                               variant: vname,
-                                               problemArray: problems,
-                                       });
-                               }
-                       );
+                       // Get only N most recent problems
+                       const query2 = "SELECT * FROM Problems " +
+                               "WHERE variant='" + vname + "' " +
+                               "ORDER BY added DESC " +
+                               "LIMIT " + MaxNbProblems;
+                       db.all(query2, (err2,problems) => {
+                               if (!!err2)
+                                       return next(err2);
+                               res.render('variant', {
+                                       title: vname + ' Variant',
+                                       variant: vname,
+                                       problemArray: problems,
+                                       lang: selectLanguage(req, res),
+                                       languages: supportedLang,
+                               });
+                       });
                });
        });
 });
@@ -48,16 +83,30 @@ 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)
+// Fetch N previous or next problems (AJAX)
 router.get("/problems/:variant([a-zA-Z0-9]+)", (req,res) => {
        if (!req.xhr)
                return res.json({errmsg: "Unauthorized access"});
-       // TODO: next or previous: in params + timedate (of current oldest or newest)
+       const vname = req.params["variant"];
+       const directionStr = (req.query.direction == "forward" ? ">" : "<");
+       const lastDt = req.query.last_dt;
+       if (!lastDt.match(/[0-9]+/))
+               return res.json({errmsg: "Bad timestamp"});
        db.serialize(function() {
-               //TODO
+               const query = "SELECT * FROM Problems " +
+                       "WHERE variant='" + vname + "' " +
+                       "  AND added " + directionStr + " " + lastDt + " " +
+                       "ORDER BY added " + (directionStr=="<" ? "DESC " : "") +
+                       "LIMIT " + MaxNbProblems;
+               db.all(query, (err,problems) => {
+                       if (!!err)
+                               return res.json(err);
+                       return res.json({problems: problems});
+               });
        });
 });
 
@@ -71,10 +120,15 @@ router.post("/problems/:variant([a-zA-Z0-9]+)", (req,res) => {
        const fen = req.body["fen"];
        if (!fen.match(/^[a-zA-Z0-9, /-]*$/))
                return res.json({errmsg: "Bad characters in FEN string"});
-       const instructions = sanitizeHtml(req.body["instructions"]);
-       const solution = sanitizeHtml(req.body["solution"]);
+       const instructions = sanitizeHtml(req.body["instructions"]).trim();
+       const solution = sanitizeHtml(req.body["solution"]).trim();
+       if (instructions.length == 0)
+               return res.json({errmsg: "Empty instructions"});
+       if (solution.length == 0)
+               return res.json({errmsg: "Empty solution"});
        db.serialize(function() {
-               let stmt = db.prepare("INSERT INTO Problems VALUES (?,?,?,?,?)");
+               let stmt = db.prepare("INSERT INTO Problems " +
+                       "(added,variant,fen,instructions,solution) VALUES (?,?,?,?,?)");
                stmt.run(timestamp, vname, fen, instructions, solution);
                stmt.finalize();
        });