| 1 | const url = require('url'); |
| 2 | |
| 3 | // Node version in Ubuntu 16.04 does not know about URL class |
| 4 | // NOTE: url is already transformed, without ?xxx=yyy... parts |
| 5 | function getJsonFromUrl(url) |
| 6 | { |
| 7 | const query = url.substr(2); //starts with "/?" |
| 8 | let result = {}; |
| 9 | query.split("&").forEach((part) => { |
| 10 | const item = part.split("="); |
| 11 | result[item[0]] = decodeURIComponent(item[1]); |
| 12 | }); |
| 13 | return result; |
| 14 | } |
| 15 | |
| 16 | module.exports = function(wss) { |
| 17 | // Associative array page --> sid --> tmpId --> socket |
| 18 | // "page" is either "/" for hall or "/game/some_gid" for Game, |
| 19 | // tmpId is required if a same user (browser) has different tabs |
| 20 | let clients = {}; |
| 21 | wss.on("connection", (socket, req) => { |
| 22 | const query = getJsonFromUrl(req.url); |
| 23 | const sid = query["sid"]; |
| 24 | const tmpId = query["tmpId"]; |
| 25 | const page = query["page"]; |
| 26 | const notifyRoom = (page,code,obj={}) => { |
| 27 | Object.keys(clients[page]).forEach(k => { |
| 28 | Object.keys(clients[page][k]).forEach(x => { |
| 29 | if (k == sid && x == tmpId) |
| 30 | return; |
| 31 | clients[page][k][x].send(JSON.stringify(Object.assign( |
| 32 | {code:code, from:sid}, obj))); |
| 33 | }); |
| 34 | }); |
| 35 | }; |
| 36 | const deleteConnexion = () => { |
| 37 | if (!clients[page] || !clients[page][sid] || !clients[page][sid][tmpId]) |
| 38 | return; //job already done |
| 39 | delete clients[page][sid][tmpId]; |
| 40 | if (Object.keys(clients[page][sid]).length == 0) |
| 41 | { |
| 42 | delete clients[page][sid]; |
| 43 | if (Object.keys(clients[page]) == 0) |
| 44 | delete clients[page]; |
| 45 | } |
| 46 | }; |
| 47 | const messageListener = (objtxt) => { |
| 48 | let obj = JSON.parse(objtxt); |
| 49 | if (!!obj.target) |
| 50 | { |
| 51 | // Check if receiver is connected, because there may be some lag |
| 52 | // between a client disconnects and another notice. |
| 53 | if (Array.isArray(obj.target)) |
| 54 | { |
| 55 | if (!clients[page][obj.target[0]] || |
| 56 | !clients[page][obj.target[0]][obj.target[1]]) |
| 57 | { |
| 58 | return; |
| 59 | } |
| 60 | } |
| 61 | else if (!clients[page][obj.target]) |
| 62 | return; |
| 63 | } |
| 64 | switch (obj.code) |
| 65 | { |
| 66 | // Wait for "connect" message to notify connection to the room, |
| 67 | // because if game loading is slow the message listener might |
| 68 | // not be ready too early. |
| 69 | case "connect": |
| 70 | { |
| 71 | notifyRoom(page, "connect"); |
| 72 | if (page.indexOf("/game/") >= 0) |
| 73 | notifyRoom("/", "gconnect", {page:page}); |
| 74 | break; |
| 75 | } |
| 76 | case "disconnect": |
| 77 | // When page changes: |
| 78 | deleteConnexion(); |
| 79 | if (!clients[page][sid]) |
| 80 | { |
| 81 | // I effectively disconnected from this page: |
| 82 | notifyRoom(page, "disconnect"); |
| 83 | if (page.indexOf("/game/") >= 0) |
| 84 | notifyRoom("/", "gdisconnect", {page:page}); |
| 85 | } |
| 86 | break; |
| 87 | case "pollclients": //from Hall or Game |
| 88 | { |
| 89 | let sockIds = []; |
| 90 | Object.keys(clients[page]).forEach(k => { |
| 91 | // Poll myself if I'm on at least another tab (same page) |
| 92 | if (k != sid || Object.keys(clients["/"][k]).length >= 2) |
| 93 | sockIds.push(k); |
| 94 | }); |
| 95 | socket.send(JSON.stringify({code:"pollclients", sockIds:sockIds})); |
| 96 | break; |
| 97 | } |
| 98 | case "pollclientsandgamers": //from Hall |
| 99 | { |
| 100 | let sockIds = []; |
| 101 | Object.keys(clients["/"]).forEach(k => { |
| 102 | // Poll myself if I'm on at least another tab (same page) |
| 103 | if (k != sid || Object.keys(clients["/"][k]).length >= 2) |
| 104 | sockIds.push({sid:k}); |
| 105 | }); |
| 106 | // NOTE: a "gamer" could also just be an observer |
| 107 | Object.keys(clients).forEach(p => { |
| 108 | if (p != "/") |
| 109 | { |
| 110 | Object.keys(clients[p]).forEach(k => { |
| 111 | if (k != sid) |
| 112 | sockIds.push({sid:k, page:p}); //page needed for gamers |
| 113 | }); |
| 114 | } |
| 115 | }); |
| 116 | socket.send(JSON.stringify({code:"pollclientsandgamers", sockIds:sockIds})); |
| 117 | break; |
| 118 | } |
| 119 | |
| 120 | // Asking something: from is fully identified, |
| 121 | // but the requested resource can be from any tmpId (except current!) |
| 122 | case "askidentity": |
| 123 | case "asklastate": |
| 124 | case "askchallenge": |
| 125 | case "askgame": |
| 126 | case "askfullgame": |
| 127 | { |
| 128 | const tmpIds = Object.keys(clients[page][obj.target]); |
| 129 | if (obj.target == sid) //targetting myself |
| 130 | { |
| 131 | const idx_myTmpid = tmpIds.findIndex(x => x == tmpId); |
| 132 | if (idx_myTmpid >= 0) |
| 133 | tmpIds.splice(idx_myTmpid, 1); |
| 134 | } |
| 135 | const tmpId_idx = Math.floor(Math.random() * tmpIds.length); |
| 136 | clients[page][obj.target][tmpIds[tmpId_idx]].send( |
| 137 | JSON.stringify({code:obj.code, from:[sid,tmpId]})); |
| 138 | break; |
| 139 | } |
| 140 | |
| 141 | // Some Hall events: target all tmpId's (except mine), |
| 142 | case "refusechallenge": |
| 143 | case "startgame": |
| 144 | Object.keys(clients[page][obj.target]).forEach(x => { |
| 145 | if (obj.target != sid || x != tmpId) |
| 146 | { |
| 147 | clients[page][obj.target][x].send(JSON.stringify( |
| 148 | {code:obj.code, data:obj.data})); |
| 149 | } |
| 150 | }); |
| 151 | break; |
| 152 | |
| 153 | // Notify all room: mostly game events |
| 154 | case "newchat": |
| 155 | case "newchallenge": |
| 156 | case "newgame": |
| 157 | case "deletechallenge": |
| 158 | case "newmove": |
| 159 | case "resign": |
| 160 | case "abort": |
| 161 | case "drawoffer": |
| 162 | case "draw": |
| 163 | notifyRoom(page, obj.code, {data:obj.data}); |
| 164 | break; |
| 165 | |
| 166 | // Passing, relaying something: from isn't needed, |
| 167 | // but target is fully identified (sid + tmpId) |
| 168 | case "challenge": |
| 169 | case "fullgame": |
| 170 | case "game": |
| 171 | case "identity": |
| 172 | case "lastate": |
| 173 | clients[page][obj.target[0]][obj.target[1]].send(JSON.stringify( |
| 174 | {code:obj.code, data:obj.data})); |
| 175 | break; |
| 176 | } |
| 177 | }; |
| 178 | const closeListener = () => { |
| 179 | // For tab or browser closing: |
| 180 | deleteConnexion(); |
| 181 | }; |
| 182 | // Update clients object: add new connexion |
| 183 | if (!clients[page]) |
| 184 | clients[page] = {[sid]: {[tmpId]: socket}}; |
| 185 | else if (!clients[page][sid]) |
| 186 | clients[page][sid] = {[tmpId]: socket}; |
| 187 | else |
| 188 | clients[page][sid][tmpId] = socket; |
| 189 | socket.on("message", messageListener); |
| 190 | socket.on("close", closeListener); |
| 191 | }); |
| 192 | } |