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: this file "in the end" would be much simpler, essentially just tracking connect/disconnect
  26 // (everything else using WebRTC)
  27 // TODO: lorsque challenge accepté, seul le dernier joueur à accepter envoi message "please start game"
  28 // avec les coordonnées des participants. Le serveur renvoit alors les détails de la partie (couleurs, position)
  29 //TODO: programmatic re-navigation on current game if we receive a move and are not there
  30
  31 module.exports = function(wss) {
  32     let clients = {}; //associative array sid --> socket
  33     wss.on("connection", (socket, req) => {
  34         const query = getJsonFromUrl(req.url);
  35         const sid = query["sid"];
  36         // Ignore duplicate connections (on the same live game that we play):
  37         if (!!clients[sid])
  38             return socket.send(JSON.stringify({code:"duplicate"}));
  39         clients[sid] = socket;
  40         // Notify room:
  41     Object.keys(clients).forEach(k => {
  42       if (k != sid)
  43         clients[k].send(JSON.stringify({code:"connect",sid:sid}));
  44     });
  45     socket.on("message", objtxt => {
  46             let obj = JSON.parse(objtxt);
  47       if (!!obj.target && !clients[obj.target])
  48         return; //receiver not connected, nothing we can do
  49       //console.log(obj.code);
  50             switch (obj.code)
  51             {
  52         case "askclients":
  53           socket.send(JSON.stringify({code:"clients", sockIds:Object.keys(clients).filter(k => k != sid)}));
  54           break;
  55         case "askidentity":
  56           clients[obj.target].send(JSON.stringify({code:"identify",from:sid}));
  57           break;
  58         case "identity":
  59           clients[obj.target].send(JSON.stringify({code:"identity",user:obj.user}));
  60           break;
  61         case "askchallenges":
  62           // TODO: ask directly to people (webRTC)
  63           // TODO... + clarify socket system
  64           break;
  65         case "newchallenge":
  66           clients[obj.target].send(JSON.stringify({code:"newchallenge",chall:obj.chall}));
  67         case "askgames":
  68           // TODO: ask directly to people (webRTC)
  69           break;
  70                 case "newchat":
  71           clients[obj.target].send(JSON.stringify({code:"newchat",msg:obj.msg}));
  72                     break;
  73                 // Transmit chats and moves to current room
  74                 // TODO: WebRTC instead in this case (most demanding?)
  75                 case "newmove":
  76           clients[obj.target].send(JSON.stringify({code:"newmove",move:obj.move}));
  77                     break;
  78                 // TODO: generalize that for several opponents
  79                 case "ping":
  80                     socket.send(JSON.stringify({code:"pong",gameId:obj.gameId}));
  81                     break;
  82                 case "lastate":
  83           const oppId = obj.target;
  84           obj.oppid = sid; //I'm the opponent of my opponent(s)
  85           clients[oppId].send(JSON.stringify(obj));
  86                     break;
  87                 // TODO: moreover, here, game info should be sent (through challenge; not stored here)
  88                 case "newgame":
  89           clients[obj.target].send(JSON.stringify({code:"newgame", game:obj.game}));
  90                     break;
  91                 case "cancelnewgame": //if a user cancel his seek
  92                     // TODO: just transmit event
  93                     //delete games[page];
  94                     break;
  95                 // TODO: also other challenge events
  96                 case "resign":
  97           clients[obj.target].send(JSON.stringify({code:"resign"}));
  98                     break;
  99                 // TODO: case "challenge" (get ID) --> send to all, "acceptchallenge" (with ID) --> send to all, "cancelchallenge" --> send to all
 100                 // also, "sendgame" (give current game info, if any) --> to new connections, "sendchallenges" (same for challenges) --> to new connections
 101         case "newchallenge":
 102           console.log("challenge received");
 103           console.log(obj.sender);
 104           console.log(obj);
 105           break;
 106             }
 107         });
 108         socket.on("close", () => {
 109             delete clients[sid];
 110       // Notify every other connected client
 111       Object.keys(clients).forEach( k => {
 112         clients[k].send(JSON.stringify({code:"disconnect",sid:sid}));
 113       });
 114         });
 115     });
 116 }