server/sockets.js

   1 const url = require('url');
   2
   3 // Node version in Ubuntu 16.04 does not know about URL class
   4 function getJsonFromUrl(url)
   5 {
   6   const query = url.substr(2); //starts with "/?"
   7   let result = {};
   8   query.split("&").forEach((part) => {
   9     const item = part.split("=");
  10     result[item[0]] = decodeURIComponent(item[1]);
  11   });
  12   return result;
  13 }
  14
  15 // Removal in array of strings (socket IDs)
  16 function remInArray(arr, item)
  17 {
  18   const idx = arr.indexOf(item);
  19   if (idx >= 0)
  20     arr.splice(idx, 1);
  21 }
  22
  23 // TODO: empêcher multi-log du même user (envoyer le user ID + secret en même temps que name et...)
  24 // --> si secret ne matche pas celui trouvé en DB, stop
  25 // TODO: lorsque challenge accepté, seul le dernier joueur à accepter envoi message "please start game"
  26 // avec les coordonnées des participants. Le serveur renvoit alors les détails de la partie (couleurs, position)
  27 //TODO: programmatic re-navigation on current game if we receive a move and are not there
  28
  29 module.exports = function(wss) {
  30   let clients = {}; //associative array sid --> socket
  31   wss.on("connection", (socket, req) => {
  32     const query = getJsonFromUrl(req.url);
  33     const sid = query["sid"];
  34     // Ignore duplicate connections (on the same live game that we play):
  35     if (!!clients[sid])
  36       return socket.send(JSON.stringify({code:"duplicate"}));
  37     clients[sid] = socket;
  38     // Notify room:
  39     Object.keys(clients).forEach(k => {
  40       if (k != sid)
  41         clients[k].send(JSON.stringify({code:"connect",sid:sid}));
  42     });
  43     socket.on("message", objtxt => {
  44       let obj = JSON.parse(objtxt);
  45       if (!!obj.target && !clients[obj.target])
  46         return; //receiver not connected, nothing we can do
  47       //console.log(obj.code);
  48       switch (obj.code)
  49       {
  50         case "pollclients":
  51           socket.send(JSON.stringify({code:"pollclients",
  52             sockIds:Object.keys(clients).filter(k => k != sid)}));
  53           break;
  54         case "askidentity":
  55           clients[obj.target].send(
  56             JSON.stringify({code:"askidentity",from:sid}));
  57           break;
  58         case "askchallenge":
  59           clients[obj.target].send(
  60             JSON.stringify({code:"askchallenge",from:sid}));
  61           break;
  62         case "askgame":
  63           clients[obj.target].send(
  64             JSON.stringify({code:"askgame",from:sid}));
  65           break;
  66         case "identity":
  67           clients[obj.target].send(
  68             JSON.stringify({code:"identity",user:obj.user}));
  69           break;
  70         case "challenge":
  71           clients[obj.target].send(
  72             JSON.stringify({code:"challenge", chall:obj.chall, from:sid}));
  73           break;
  74         case "acceptchallenge":
  75           clients[obj.target].send(
  76             JSON.stringify({code:"acceptchallenge", cid:obj.cid, from:sid}));
  77           break;
  78         case "withdrawchallenge":
  79           clients[obj.target].send(
  80             JSON.stringify({code:"withdrawchallenge", cid:obj.cid, from:sid}));
  81           break;
  82         case "refusechallenge":
  83           clients[obj.target].send(
  84             JSON.stringify({code:"refusechallenge", cid:obj.cid, from:sid}));
  85           break;
  86         case "deletechallenge":
  87           clients[obj.target].send(
  88             JSON.stringify({code:"deletechallenge", cid:obj.cid, from:sid}));
  89           break;
  90         case "newgame":
  91           clients[obj.target].send(JSON.stringify(
  92             {code:"newgame", gameInfo:obj.gameInfo, cid:obj.cid}));
  93           break;
  94         case "game":
  95           // TODO: relay (live) game to other player
  96           break;
  97         case "newchat":
  98           clients[obj.target].send(JSON.stringify({code:"newchat",msg:obj.msg}));
  99           break;
 100         // Transmit chats and moves to current room
 101         // TODO: WebRTC instead in this case (most demanding?)
 102         case "newmove":
 103           clients[obj.target].send(JSON.stringify({code:"newmove",move:obj.move}));
 104           break;
 105         // TODO: generalize that for several opponents
 106         case "ping":
 107           socket.send(JSON.stringify({code:"pong",gameId:obj.gameId}));
 108           break;
 109         case "lastate":
 110           const oppId = obj.target;
 111           obj.oppid = sid; //I'm the opponent of my opponent(s)
 112           clients[oppId].send(JSON.stringify(obj));
 113           break;
 114         case "resign":
 115           clients[obj.target].send(JSON.stringify({code:"resign"}));
 116           break;
 117       }
 118     });
 119     socket.on("close", () => {
 120       delete clients[sid];
 121       // Notify every other connected client
 122       Object.keys(clients).forEach( k => {
 123         clients[k].send(JSON.stringify({code:"disconnect",sid:sid}));
 124       });
 125     });
 126   });
 127 }