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     // TODO: later, allow duplicate connections (shouldn't be much more complicated)
  35     // Ignore duplicate connections (on the same live game that we play):
  36     if (!!clients[sid])
  37       return socket.send(JSON.stringify({code:"duplicate"}));
  38     clients[sid] = socket;
  39     // Notify room:
  40     Object.keys(clients).forEach(k => {
  41       if (k != sid)
  42         clients[k].send(JSON.stringify({code:"connect",sid:sid}));
  43     });
  44     socket.on("message", objtxt => {
  45       let obj = JSON.parse(objtxt);
  46       if (!!obj.target && !clients[obj.target])
  47         return; //receiver not connected, nothing we can do
  48       //console.log(obj.code);
  49       switch (obj.code)
  50       {
  51         case "pollclients":
  52           socket.send(JSON.stringify({code:"pollclients",
  53             sockIds:Object.keys(clients).filter(k => k != sid)}));
  54           break;
  55         case "askidentity":
  56           clients[obj.target].send(
  57             JSON.stringify({code:"askidentity",from:sid}));
  58           break;
  59         case "askchallenge":
  60           clients[obj.target].send(
  61             JSON.stringify({code:"askchallenge",from:sid}));
  62           break;
  63         case "askgame":
  64           clients[obj.target].send(
  65             JSON.stringify({code:"askgame",from:sid}));
  66           break;
  67         case "identity":
  68           clients[obj.target].send(
  69             JSON.stringify({code:"identity",user:obj.user}));
  70           break;
  71         case "challenge":
  72           clients[obj.target].send(
  73             JSON.stringify({code:"challenge", chall:obj.chall, from:sid}));
  74           break;
  75         case "acceptchallenge":
  76           clients[obj.target].send(
  77             JSON.stringify({code:"acceptchallenge", cid:obj.cid, from:sid}));
  78           break;
  79         case "withdrawchallenge":
  80           clients[obj.target].send(
  81             JSON.stringify({code:"withdrawchallenge", cid:obj.cid, from:sid}));
  82           break;
  83         case "refusechallenge":
  84           clients[obj.target].send(
  85             JSON.stringify({code:"refusechallenge", cid:obj.cid, from:sid}));
  86           break;
  87         case "deletechallenge":
  88           clients[obj.target].send(
  89             JSON.stringify({code:"deletechallenge", cid:obj.cid, from:sid}));
  90           break;
  91         case "newgame":
  92           clients[obj.target].send(JSON.stringify(
  93             {code:"newgame", gameInfo:obj.gameInfo, cid:obj.cid}));
  94           break;
  95         case "game":
  96           // TODO: relay (live) game to other player
  97           break;
  98         case "newchat":
  99           clients[obj.target].send(JSON.stringify({code:"newchat",msg:obj.msg}));
 100           break;
 101         // Transmit chats and moves to current room
 102         // TODO: WebRTC instead in this case (most demanding?)
 103         case "newmove":
 104           clients[obj.target].send(JSON.stringify({code:"newmove",move:obj.move}));
 105           break;
 106         // TODO: generalize that for several opponents
 107         case "ping":
 108           socket.send(JSON.stringify({code:"pong",gameId:obj.gameId}));
 109           break;
 110         case "lastate":
 111           const oppId = obj.target;
 112           obj.oppid = sid; //I'm the opponent of my opponent(s)
 113           clients[oppId].send(JSON.stringify(obj));
 114           break;
 115         case "resign":
 116           clients[obj.target].send(JSON.stringify({code:"resign"}));
 117           break;
 118         case "abort":
 119           clients[obj.target].send(JSON.stringify({code:"abort",msg:obj.msg}));
 120           break;
 121       }
 122     });
 123     socket.on("close", () => {
 124       delete clients[sid];
 125       // Notify every other connected client
 126       Object.keys(clients).forEach( k => {
 127         clients[k].send(JSON.stringify({code:"disconnect",sid:sid}));
 128       });
 129     });
 130   });
 131 }