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 module.exports = function(wss) {
  16   let clients = {}; //associative array sid --> socket
  17   wss.on("connection", (socket, req) => {
  18     const query = getJsonFromUrl(req.url);
  19     const sid = query["sid"];
  20     if (!!clients[sid])
  21       return socket.send(JSON.stringify({code:"duplicate"}));
  22     clients[sid] = {sock: socket, page: query["page"]};
  23     const notifyRoom = (page,code,obj={},excluded=[]) => {
  24       Object.keys(clients).forEach(k => {
  25         if (k in excluded)
  26           return;
  27         if (k != sid && clients[k].page == page)
  28         {
  29           clients[k].sock.send(JSON.stringify(Object.assign(
  30             {code:code, from:sid}, obj)));
  31         }
  32       });
  33     };
  34     notifyRoom(query["page"], "connect"); //Hall or Game
  35     if (query["page"].indexOf("/game/") >= 0)
  36       notifyRoom("/", "connect"); //notify main hall
  37     socket.on("message", objtxt => {
  38       let obj = JSON.parse(objtxt);
  39       if (!!obj.target && !clients[obj.target])
  40         return; //receiver not connected, nothing we can do
  41       switch (obj.code)
  42       {
  43         case "pollclients":
  44           const curPage = clients[sid].page;
  45           socket.send(JSON.stringify({code:"pollclients",
  46             sockIds: Object.keys(clients).filter(k => k != sid &&
  47               (clients[k].page == curPage ||
  48               // Consider that people playing are in Hall too:
  49               (curPage == "/" && clients[k].page.indexOf("/game/") >= 0))
  50             )}));
  51           break;
  52         case "pagechange":
  53           notifyRoom(clients[sid].page, "disconnect");
  54           if (clients[sid].page.indexOf("/game/") >= 0)
  55             notifyRoom("/", "disconnect");
  56           clients[sid].page = obj.page;
  57           notifyRoom(obj.page, "connect");
  58           if (obj.page.indexOf("/game/") >= 0)
  59             notifyRoom("/", "connect");
  60           break;
  61         case "askidentity":
  62           clients[obj.target].sock.send(JSON.stringify(
  63             {code:"askidentity",from:sid}));
  64           break;
  65         case "askchallenge":
  66           clients[obj.target].sock.send(JSON.stringify(
  67             {code:"askchallenge",from:sid}));
  68           break;
  69         case "askgames":
  70         {
  71           // Check all clients playing, and send them a "askgame" message
  72           let gameSids = {}; //game ID --> [sid1, sid2]
  73           const regexpGid = /\/[a-zA-Z0-9]+$/;
  74           Object.keys(clients).forEach(k => {
  75             if (k != sid && clients[k].page.indexOf("/game/") >= 0)
  76             {
  77               const gid = clients[k].page.match(regexpGid)[0];
  78               if (!gameSids[gid])
  79                 gameSids[gid] = [k];
  80               else
  81                 gameSids[gid].push(k);
  82             }
  83           });
  84           // Request only one client out of 2 (TODO: this is a bit heavy)
  85           // Alt: ask game to all, and filter later?
  86           Object.keys(gameSids).forEach(gid => {
  87             const L = gameSids[gid].length;
  88             const idx = L > 1
  89               ? Math.floor(Math.random() * Math.floor(L))
  90               : 0;
  91             const rid = gameSids[gid][idx];
  92             clients[rid].sock.send(JSON.stringify(
  93               {code:"askgame", from: sid}));
  94           });
  95           break;
  96         }
  97         case "askfullgame":
  98           clients[obj.target].sock.send(JSON.stringify(
  99             {code:"askfullgame", from:sid}));
 100           break;
 101         case "fullgame":
 102           clients[obj.target].sock.send(JSON.stringify(
 103             {code:"fullgame", game:obj.game}));
 104           break;
 105         case "identity":
 106           clients[obj.target].sock.send(JSON.stringify(
 107             {code:"identity",user:obj.user}));
 108           break;
 109         case "refusechallenge":
 110           clients[obj.target].sock.send(JSON.stringify(
 111             {code:"refusechallenge", cid:obj.cid, from:sid}));
 112           break;
 113         case "deletechallenge":
 114           clients[obj.target].sock.send(JSON.stringify(
 115             {code:"deletechallenge", cid:obj.cid, from:sid}));
 116           break;
 117         case "newgame":
 118           clients[obj.target].sock.send(JSON.stringify(
 119             {code:"newgame", gameInfo:obj.gameInfo, cid:obj.cid}));
 120           break;
 121         case "challenge":
 122           clients[obj.target].sock.send(JSON.stringify(
 123             {code:"challenge", chall:obj.chall, from:sid}));
 124           break;
 125         case "game":
 126           if (!!obj.target)
 127           {
 128             clients[obj.target].sock.send(JSON.stringify(
 129               {code:"game", game:obj.game, from:sid}));
 130           }
 131           else
 132           {
 133             // Notify all room except opponent and me:
 134             notifyRoom("/", "game", {game:obj.game}, [obj.oppsid]);
 135           }
 136           break;
 137         case "newchat":
 138           // WARNING: do not use query["page"], because the page may change
 139           notifyRoom(clients[sid].page, "newchat",
 140             {msg: obj.msg, name: obj.name});
 141           break;
 142         // TODO: WebRTC instead in this case (most demanding?)
 143         case "newmove":
 144           clients[obj.target].sock.send(JSON.stringify(
 145             {code:"newmove", move:obj.move}));
 146           break;
 147         case "lastate":
 148           clients[obj.target].sock.send(JSON.stringify(
 149             {code:"lastate", state:obj.state}));
 150           break;
 151         case "resign":
 152           clients[obj.target].sock.send(JSON.stringify(
 153             {code:"resign"}));
 154           break;
 155         case "abort":
 156           clients[obj.target].sock.send(JSON.stringify(
 157             {code:"abort",msg:obj.msg}));
 158           break;
 159         case "drawoffer":
 160           clients[obj.target].sock.send(JSON.stringify(
 161             {code:"drawoffer"}));
 162           break;
 163         case "draw":
 164           clients[obj.target].sock.send(JSON.stringify(
 165             {code:"draw"}));
 166           break;
 167       }
 168     });
 169     socket.on("close", () => {
 170       const page = clients[sid].page;
 171       delete clients[sid];
 172       notifyRoom(page, "disconnect");
 173       if (page.indexOf("/game/") >= 0)
 174         notifyRoom("/", "disconnect"); //notify main hall
 175     });
 176   });
 177 }