| 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 | // Helper to safe-send some message through a (web-)socket: |
| 17 | function send(socket, message) |
| 18 | { |
| 19 | if (!!socket && socket.readyState == 1) |
| 20 | socket.send(JSON.stringify(message)); |
| 21 | } |
| 22 | |
| 23 | module.exports = function(wss) { |
| 24 | // Associative array page --> sid --> tmpId --> socket |
| 25 | // "page" is either "/" for hall or "/game/some_gid" for Game, |
| 26 | // tmpId is required if a same user (browser) has different tabs |
| 27 | let clients = {}; |
| 28 | wss.on("connection", (socket, req) => { |
| 29 | const query = getJsonFromUrl(req.url); |
| 30 | const sid = query["sid"]; |
| 31 | const tmpId = query["tmpId"]; |
| 32 | const page = query["page"]; |
| 33 | const notifyRoom = (page,code,obj={}) => { |
| 34 | if (!clients[page]) |
| 35 | return; |
| 36 | Object.keys(clients[page]).forEach(k => { |
| 37 | Object.keys(clients[page][k]).forEach(x => { |
| 38 | if (k == sid && x == tmpId) |
| 39 | return; |
| 40 | send(clients[page][k][x], Object.assign({code:code, from:sid}, obj)); |
| 41 | }); |
| 42 | }); |
| 43 | }; |
| 44 | const deleteConnexion = () => { |
| 45 | if (!clients[page] || !clients[page][sid] || !clients[page][sid][tmpId]) |
| 46 | return; //job already done |
| 47 | delete clients[page][sid][tmpId]; |
| 48 | if (Object.keys(clients[page][sid]).length == 0) |
| 49 | { |
| 50 | delete clients[page][sid]; |
| 51 | if (Object.keys(clients[page]) == 0) |
| 52 | delete clients[page]; |
| 53 | } |
| 54 | }; |
| 55 | const doDisconnect = () => { |
| 56 | deleteConnexion(); |
| 57 | if (!clients[page] || !clients[page][sid]) |
| 58 | { |
| 59 | // I effectively disconnected from this page: |
| 60 | notifyRoom(page, "disconnect"); |
| 61 | if (page.indexOf("/game/") >= 0) |
| 62 | notifyRoom("/", "gdisconnect", {page:page}); |
| 63 | } |
| 64 | }; |
| 65 | const messageListener = (objtxt) => { |
| 66 | let obj = JSON.parse(objtxt); |
| 67 | switch (obj.code) |
| 68 | { |
| 69 | // Wait for "connect" message to notify connection to the room, |
| 70 | // because if game loading is slow the message listener might |
| 71 | // not be ready too early. |
| 72 | case "connect": |
| 73 | { |
| 74 | notifyRoom(page, "connect"); |
| 75 | if (page.indexOf("/game/") >= 0) |
| 76 | notifyRoom("/", "gconnect", {page:page}); |
| 77 | break; |
| 78 | } |
| 79 | case "disconnect": |
| 80 | // When page changes: |
| 81 | doDisconnect(); |
| 82 | break; |
| 83 | case "killme": |
| 84 | { |
| 85 | // Self multi-connect: manual removal + disconnect |
| 86 | const doKill = (pg) => { |
| 87 | Object.keys(clients[pg][obj.sid]).forEach(x => { |
| 88 | send(clients[pg][obj.sid][x], {code: "killed"}); |
| 89 | }); |
| 90 | delete clients[pg][obj.sid]; |
| 91 | }; |
| 92 | const disconnectFromOtherConnexion = (pg,code,o={}) => { |
| 93 | Object.keys(clients[pg]).forEach(k => { |
| 94 | if (k != obj.sid) |
| 95 | { |
| 96 | Object.keys(clients[pg][k]).forEach(x => { |
| 97 | send(clients[pg][k][x], Object.assign({code:code, from:obj.sid}, o)); |
| 98 | }); |
| 99 | } |
| 100 | }); |
| 101 | }; |
| 102 | Object.keys(clients).forEach(pg => { |
| 103 | if (!!clients[pg][obj.sid]) |
| 104 | { |
| 105 | doKill(pg); |
| 106 | disconnectFromOtherConnexion(pg, "disconnect"); |
| 107 | if (pg.indexOf("/game/") >= 0 && !!clients["/"]) |
| 108 | disconnectFromOtherConnexion("/", "gdisconnect", {page:pg}); |
| 109 | } |
| 110 | }); |
| 111 | break; |
| 112 | } |
| 113 | case "pollclients": //from Hall or Game |
| 114 | { |
| 115 | let sockIds = []; |
| 116 | Object.keys(clients[page]).forEach(k => { |
| 117 | // Avoid polling myself: no new information to get |
| 118 | if (k != sid) |
| 119 | sockIds.push(k); |
| 120 | }); |
| 121 | send(socket, {code:"pollclients", sockIds:sockIds}); |
| 122 | break; |
| 123 | } |
| 124 | case "pollclientsandgamers": //from Hall |
| 125 | { |
| 126 | let sockIds = []; |
| 127 | Object.keys(clients["/"]).forEach(k => { |
| 128 | // Avoid polling myself: no new information to get |
| 129 | if (k != sid) |
| 130 | sockIds.push({sid:k}); |
| 131 | }); |
| 132 | // NOTE: a "gamer" could also just be an observer |
| 133 | Object.keys(clients).forEach(p => { |
| 134 | if (p != "/") |
| 135 | { |
| 136 | Object.keys(clients[p]).forEach(k => { |
| 137 | if (k != sid) |
| 138 | sockIds.push({sid:k, page:p}); //page needed for gamers |
| 139 | }); |
| 140 | } |
| 141 | }); |
| 142 | send(socket, {code:"pollclientsandgamers", sockIds:sockIds}); |
| 143 | break; |
| 144 | } |
| 145 | |
| 146 | // Asking something: from is fully identified, |
| 147 | // but the requested resource can be from any tmpId (except current!) |
| 148 | case "askidentity": |
| 149 | case "asklastate": |
| 150 | case "askchallenge": |
| 151 | case "askgame": |
| 152 | case "askfullgame": |
| 153 | { |
| 154 | const pg = obj.page || page; //required for askidentity and askgame |
| 155 | // In cas askfullgame to wrong SID for example, would crash: |
| 156 | if (clients[pg] && clients[pg][obj.target]) |
| 157 | { |
| 158 | const tmpIds = Object.keys(clients[pg][obj.target]); |
| 159 | if (obj.target == sid) //targetting myself |
| 160 | { |
| 161 | const idx_myTmpid = tmpIds.findIndex(x => x == tmpId); |
| 162 | if (idx_myTmpid >= 0) |
| 163 | tmpIds.splice(idx_myTmpid, 1); |
| 164 | } |
| 165 | const tmpId_idx = Math.floor(Math.random() * tmpIds.length); |
| 166 | send( |
| 167 | clients[pg][obj.target][tmpIds[tmpId_idx]], |
| 168 | {code:obj.code, from:[sid,tmpId,page]} |
| 169 | ); |
| 170 | } |
| 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 | send(clients[page][obj.target][x], {code:obj.code, data:obj.data}); |
| 180 | }); |
| 181 | break; |
| 182 | |
| 183 | // Notify all room: mostly game events |
| 184 | case "newchat": |
| 185 | case "newchallenge": |
| 186 | case "newgame": |
| 187 | case "deletechallenge": |
| 188 | case "newmove": |
| 189 | case "resign": |
| 190 | case "abort": |
| 191 | case "drawoffer": |
| 192 | case "draw": |
| 193 | { |
| 194 | notifyRoom(page, obj.code, {data:obj.data}); |
| 195 | const mygamesPg = "/mygames"; |
| 196 | if (obj.code == "newmove" && clients[mygamesPg]) |
| 197 | { |
| 198 | // Relay newmove info to myGames page |
| 199 | // NOTE: the move itself is not needed (for now at least) |
| 200 | const gid = page.split("/")[2]; //format is "/game/gid" |
| 201 | obj.data.players.forEach(pSid => { |
| 202 | if (clients[mygamesPg][pSid]) |
| 203 | { |
| 204 | Object.keys(clients[mygamesPg][pSid]).forEach(x => { |
| 205 | send( |
| 206 | clients[mygamesPg][pSid][x], |
| 207 | {code:"newmove", gid:gid} |
| 208 | ); |
| 209 | }); |
| 210 | } |
| 211 | }); |
| 212 | } |
| 213 | break; |
| 214 | } |
| 215 | |
| 216 | case "result": |
| 217 | // Special case: notify all, 'transroom': Game --> Hall |
| 218 | notifyRoom("/", "result", {gid:obj.gid, score:obj.score}); |
| 219 | break; |
| 220 | |
| 221 | // Passing, relaying something: from isn't needed, |
| 222 | // but target is fully identified (sid + tmpId) |
| 223 | case "challenge": |
| 224 | case "fullgame": |
| 225 | case "game": |
| 226 | case "identity": |
| 227 | case "lastate": |
| 228 | { |
| 229 | const pg = obj.target[2] || page; //required for identity and game |
| 230 | // NOTE: if in game we ask identity to opponent still in Hall, |
| 231 | // but leaving Hall, clients[pg] or clients[pg][target] could be ndefined |
| 232 | if (clients[pg] && clients[pg][obj.target[0]]) |
| 233 | send(clients[pg][obj.target[0]][obj.target[1]], {code:obj.code, data:obj.data}); |
| 234 | break; |
| 235 | } |
| 236 | } |
| 237 | }; |
| 238 | const closeListener = () => { |
| 239 | // For browser or tab closing (including page reload): |
| 240 | doDisconnect(); |
| 241 | }; |
| 242 | // Update clients object: add new connexion |
| 243 | if (!clients[page]) |
| 244 | clients[page] = {[sid]: {[tmpId]: socket}}; |
| 245 | else if (!clients[page][sid]) |
| 246 | clients[page][sid] = {[tmpId]: socket}; |
| 247 | else |
| 248 | clients[page][sid][tmpId] = socket; |
| 249 | socket.on("message", messageListener); |
| 250 | socket.on("close", closeListener); |
| 251 | }); |
| 252 | } |