X-Git-Url: https://git.auder.net/?a=blobdiff_plain;f=routes%2Fall.js;h=5ab6ae90f67b61936c02fe57a058786b18d8b9f2;hb=e8e4adbded06cf3ccc36cee66a786d6e97b726ef;hp=d5b4e569d1cde8fc3ffd99c056aa6576e4b955ce;hpb=3a60958052399bcfcdda221de2c3cb8abe7f19ea;p=vchess.git

diff --git a/routes/all.js b/routes/all.js
index d5b4e569..5ab6ae90 100644
--- a/routes/all.js
+++ b/routes/all.js
@@ -4,6 +4,34 @@ const createError = require('http-errors');
 const sqlite3 = require('sqlite3');//.verbose();
 const db = new sqlite3.Database('db/vchess.sqlite');
 const sanitizeHtml = require('sanitize-html');
+const MaxNbProblems = 20;
+
+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) {
@@ -13,33 +41,39 @@ 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 +82,30 @@ 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});
+		});
 	});
 });
 
@@ -71,8 +119,12 @@ 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 " +
 			"(added,variant,fen,instructions,solution) VALUES (?,?,?,?,?)");