| 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 | if (!clients[page]) |
| 28 | return; |
| 29 | Object.keys(clients[page]).forEach(k => { |
| 30 | Object.keys(clients[page][k]).forEach(x => { |
| 31 | if (k == sid && x == tmpId) |
| 32 | return; |
| 33 | clients[page][k][x].send(JSON.stringify(Object.assign( |
| 34 | {code:code, from:sid}, obj))); |
| 35 | }); |
| 36 | }); |
| 37 | }; |
| 38 | const deleteConnexion = () => { |
| 39 | if (!clients[page] || !clients[page][sid] || !clients[page][sid][tmpId]) |
| 40 | return; //job already done |
| 41 | delete clients[page][sid][tmpId]; |
| 42 | if (Object.keys(clients[page][sid]).length == 0) |
| 43 | { |
| 44 | delete clients[page][sid]; |
| 45 | if (Object.keys(clients[page]) == 0) |
| 46 | delete clients[page]; |
| 47 | } |
| 48 | }; |
| 49 | const messageListener = (objtxt) => { |
| 50 | let obj = JSON.parse(objtxt); |
| 51 | if (!!obj.target) |
| 52 | { |
| 53 | // Check if receiver is connected, because there may be some lag |
| 54 | // between a client disconnects and another notice. |
| 55 | if (Array.isArray(obj.target)) |
| 56 | { |
| 57 | if (!clients[page][obj.target[0]] || |
| 58 | !clients[page][obj.target[0]][obj.target[1]]) |
| 59 | { |
| 60 | return; |
| 61 | } |
| 62 | } |
| 63 | else if (!clients[page][obj.target]) |
| 64 | return; |
| 65 | } |
| 66 | switch (obj.code) |
| 67 | { |
| 68 | // Wait for "connect" message to notify connection to the room, |
| 69 | // because if game loading is slow the message listener might |
| 70 | // not be ready too early. |
| 71 | case "connect": |
| 72 | { |
| 73 | notifyRoom(page, "connect"); |
| 74 | if (page.indexOf("/game/") >= 0) |
| 75 | notifyRoom("/", "gconnect", {page:page}); |
| 76 | break; |
| 77 | } |
| 78 | case "disconnect": |
| 79 | // When page changes: |
| 80 | deleteConnexion(); |
| 81 | if (!clients[page] || !clients[page][sid]) |
| 82 | { |
| 83 | // I effectively disconnected from this page: |
| 84 | notifyRoom(page, "disconnect"); |
| 85 | if (page.indexOf("/game/") >= 0) |
| 86 | notifyRoom("/", "gdisconnect", {page:page}); |
| 87 | } |
| 88 | break; |
| 89 | case "killme": |
| 90 | { |
| 91 | // Self multi-connect: manual removal + disconnect |
| 92 | const doKill = (pg) => { |
| 93 | Object.keys(clients[pg][obj.sid]).forEach(x => { |
| 94 | clients[pg][obj.sid][x].send(JSON.stringify({code: "killed"})); |
| 95 | }); |
| 96 | delete clients[pg][obj.sid]; |
| 97 | }; |
| 98 | const disconnectFromOtherConnexion = (pg,code,o={}) => { |
| 99 | Object.keys(clients[pg]).forEach(k => { |
| 100 | if (k != obj.sid) |
| 101 | { |
| 102 | Object.keys(clients[pg][k]).forEach(x => { |
| 103 | clients[pg][k][x].send(JSON.stringify(Object.assign( |
| 104 | {code:code, from:obj.sid}, o))); |
| 105 | }); |
| 106 | } |
| 107 | }); |
| 108 | }; |
| 109 | Object.keys(clients).forEach(pg => { |
| 110 | if (!!clients[pg][obj.sid]) |
| 111 | { |
| 112 | doKill(pg); |
| 113 | disconnectFromOtherConnexion(pg, "disconnect"); |
| 114 | if (pg.indexOf("/game/") >= 0) |
| 115 | disconnectFromOtherConnexion("/", "gdisconnect", {page:pg}); |
| 116 | } |
| 117 | }); |
| 118 | break; |
| 119 | } |
| 120 | case "pollclients": //from Hall or Game |
| 121 | { |
| 122 | let sockIds = []; |
| 123 | Object.keys(clients[page]).forEach(k => { |
| 124 | // Avoid polling myself: no new information to get |
| 125 | if (k != sid) |
| 126 | sockIds.push(k); |
| 127 | }); |
| 128 | socket.send(JSON.stringify({code:"pollclients", sockIds:sockIds})); |
| 129 | break; |
| 130 | } |
| 131 | case "pollclientsandgamers": //from Hall |
| 132 | { |
| 133 | let sockIds = []; |
| 134 | Object.keys(clients["/"]).forEach(k => { |
| 135 | // Avoid polling myself: no new information to get |
| 136 | if (k != sid) |
| 137 | sockIds.push({sid:k}); |
| 138 | }); |
| 139 | // NOTE: a "gamer" could also just be an observer |
| 140 | Object.keys(clients).forEach(p => { |
| 141 | if (p != "/") |
| 142 | { |
| 143 | Object.keys(clients[p]).forEach(k => { |
| 144 | if (k != sid) |
| 145 | sockIds.push({sid:k, page:p}); //page needed for gamers |
| 146 | }); |
| 147 | } |
| 148 | }); |
| 149 | socket.send(JSON.stringify({code:"pollclientsandgamers", sockIds:sockIds})); |
| 150 | break; |
| 151 | } |
| 152 | |
| 153 | // Asking something: from is fully identified, |
| 154 | // but the requested resource can be from any tmpId (except current!) |
| 155 | case "askidentity": |
| 156 | case "asklastate": |
| 157 | case "askchallenge": |
| 158 | case "askgame": |
| 159 | case "askfullgame": |
| 160 | { |
| 161 | const tmpIds = Object.keys(clients[page][obj.target]); |
| 162 | if (obj.target == sid) //targetting myself |
| 163 | { |
| 164 | const idx_myTmpid = tmpIds.findIndex(x => x == tmpId); |
| 165 | if (idx_myTmpid >= 0) |
| 166 | tmpIds.splice(idx_myTmpid, 1); |
| 167 | } |
| 168 | const tmpId_idx = Math.floor(Math.random() * tmpIds.length); |
| 169 | clients[page][obj.target][tmpIds[tmpId_idx]].send( |
| 170 | JSON.stringify({code:obj.code, from:[sid,tmpId]})); |
| 171 | break; |
| 172 | } |
| 173 | |
| 174 | // Some Hall events: target all tmpId's (except mine), |
| 175 | case "refusechallenge": |
| 176 | case "startgame": |
| 177 | Object.keys(clients[page][obj.target]).forEach(x => { |
| 178 | if (obj.target != sid || x != tmpId) |
| 179 | { |
| 180 | clients[page][obj.target][x].send(JSON.stringify( |
| 181 | {code:obj.code, data:obj.data})); |
| 182 | } |
| 183 | }); |
| 184 | break; |
| 185 | |
| 186 | // Notify all room: mostly game events |
| 187 | case "newchat": |
| 188 | case "newchallenge": |
| 189 | case "newgame": |
| 190 | case "deletechallenge": |
| 191 | case "newmove": |
| 192 | case "resign": |
| 193 | case "abort": |
| 194 | case "drawoffer": |
| 195 | case "draw": |
| 196 | notifyRoom(page, obj.code, {data:obj.data}); |
| 197 | break; |
| 198 | |
| 199 | // Passing, relaying something: from isn't needed, |
| 200 | // but target is fully identified (sid + tmpId) |
| 201 | case "challenge": |
| 202 | case "fullgame": |
| 203 | case "game": |
| 204 | case "identity": |
| 205 | case "lastate": |
| 206 | clients[page][obj.target[0]][obj.target[1]].send(JSON.stringify( |
| 207 | {code:obj.code, data:obj.data})); |
| 208 | break; |
| 209 | } |
| 210 | }; |
| 211 | const closeListener = () => { |
| 212 | // For tab or browser closing: |
| 213 | deleteConnexion(); |
| 214 | }; |
| 215 | // Update clients object: add new connexion |
| 216 | if (!clients[page]) |
| 217 | clients[page] = {[sid]: {[tmpId]: socket}}; |
| 218 | else if (!clients[page][sid]) |
| 219 | clients[page][sid] = {[tmpId]: socket}; |
| 220 | else |
| 221 | clients[page][sid][tmpId] = socket; |
| 222 | socket.on("message", messageListener); |
| 223 | socket.on("close", closeListener); |
| 224 | }); |
| 225 | } |