Start server implementation for correspondance play (early debug stage)

[vchess.git] / public / javascripts / shared / challengeCheck.js

diff --git a/public/javascripts/shared/challengeCheck.js b/public/javascripts/shared/challengeCheck.js
new file mode 100644 (file)
index 0000000..a5833f6
--- /dev/null
+++ b/public/javascripts/shared/challengeCheck.js
@@ -0,0 +1,66 @@
+function checkChallenge(c)
+{
+       const vid = parseInt(c.vid);
+       if (isNaN(vid) || vid <= 0)
+               return "Please select a variant";
+
+       const mainTime = parseInt(c.mainTime);
+       const increment = parseInt(c.increment);
+       if (isNaN(mainTime) || mainTime <= 0)
+               return "Main time should be strictly positive";
+       if (isNaN(increment) || increment < 0)
+               return "Increment must be positive";
+
+       // Basic alphanumeric check for players names
+       let playerCount = 0;
+       for (p of c.players)
+       {
+               if (p.length > 0)
+               {
+                       if (!p.match(/^[\w]+$/))
+                               return "Wrong characters in players names";
+                       playerCount++;
+               }
+       }
+
+       if (playerCount > 0 && playerCount != c.nbPlayers)
+               return "None, or all of the opponent names must be filled"
+
+       if (!!document) //client side
+       {
+               const idxInVariants = variantArray.findIndex(v => v.id == c.vid);
+               const vname = variantArray[idxInVariants].name;
+               const scriptId = vname + "RulesScript";
+               const afterRulesAreLoaded = () => {
+                       const V = eval(vname + "Rules");
+                       // Allow custom FEN (and check it) only for individual challenges
+                       if (c.fen.length > 0 && playerCount > 0)
+                       {
+                               if (!V.IsGoodFen(c.fen))
+                                       return "Bad FEN string";
+                       }
+                       else
+                       {
+                               // Generate a FEN
+                               c.fen = V.GenRandInitFen();
+                       }
+               };
+               if (!document.getElementById(scriptId))
+               {
+                       // Load variant rules (only once)
+                       var script = document.createElement("script");
+                       script.id = scriptId;
+                       script.src = "/javascripts/variants/" + vname + ".js";
+                       document.body.appendChild(script);
+                       script.onload = afterRulesAreLoaded;
+               }
+       }
+       else
+       {
+               // Just characters check on server:
+               if (!c.fen.match(/^[a-zA-Z0-9, /-]*$/))
+                       return "Bad FEN string";
+       }
+}
+
+try { module.exports = checkChallenge; } catch(e) { } //for server