Implement basic handshake and message sending capabilities for gatewayv2

brainlet/api/v1/content.js

@@ -127,7 +127,7 @@ app.get("/category/list", authenticateEndpoint(async (req, res) => {
     }
 
     // TODO: This is probably not efficient
-    const categories = await Category.find().sort({ _id: -1 }).limit(count).select("-posts -__v").populate("creator", User.getPulicFields());
+    const categories = await Category.find().lean().sort({ _id: -1 }).limit(count).select("-posts -__v").populate("creator", User.getPulicFields());
 
     res.status(200).json({
         error: false,

brainlet/api/v2/gateway/index.js

@@ -1,15 +1,132 @@
 const websockets = require("ws");
+const EventEmitter = require("events");
+const uuid = require("uuid");
 
-class GatewayServer {
+const User = require("../../../models/User");
+const Category = require("../../../models/Category");
+const { parseMessage, opcodeSeparator, getOpcodeByName } = require("./messageparser");
+const { checkToken } = require("../../../common/auth/authfunctions");
+
+const pingCheckDelay = 10000;
+
+class GatewayServer extends EventEmitter {
     constructor({ server }) {
-        this.wss = new websockets.Server({ server });
+        super();
+        this.wss = new websockets.Server({ server: server, path: "/gateway" });
+
+        this.pingInterval = setInterval(() => {
+            this.wss.clients.forEach((client) => {
+                if (!client.alive) {
+                    console.log("gateway: terminating client due to ping timeout");
+                    client.terminate();
+                }
+                client.alive = false;
+                client.ping(() => {});
+            });
+        }, pingCheckDelay);
+
+        this.wss.on("close", () => {
+            clearInterval(this.pingInterval);
+            console.log("gateway: websocket server closed");
+        });
 
         this.wss.on("connection", (ws) => {
-            ws.on("message", (data) => {
+            // Send HELLO message as soon as the client connects
+            ws.send(this.packet("HELLO", {}));
+            ws.session = {
+                authenticated: false,
+                user: null,
+                sessionId: uuid.v4()
+            };
+            ws.alive = true;
 
+            ws.on("pong", () => {
+                ws.alive = true;
+            });
+            ws.on("message", async (data) => {
+                try {
+                    const message = parseMessage(data);
+                    switch (message.opcodeType) {
+                    case "YOO": {
+                        // The client has responded to our HELLO with a YOO packet
+                        try {
+                            const user = await checkToken(message.data.token);
+                            if (!user) return ws.close(4006, "Authentication failed.");
+                            ws.session.user = user;
+                            ws.session.authenticated = true;
+
+                            // The user is now successfully authenticated, send the YOO_ACK packet
+                            // TODO: This is probably not efficient
+
+                            let channels = await Category.find().lean().sort({ _id: -1 }).limit(50).select("-posts -__v").populate("creator", User.getPulicFields(true));
+                            if (!channels) channels = [];
+                            channels = channels.map(x => ({ ...x, _id: x._id.toString() }));
+
+                            ws.channels = channels.map(x => x._id);
+
+                            ws.send(this.packet("YOO_ACK", { session_id: ws.session.sessionId, channels, user: { username: user.username, _id: user._id } }));
+                            console.log(`gateway: user ${user.username}: handshake complete`);
+                        } catch (e) {
+                            console.log("gateway:", e);
+                            return ws.close(4006, "Authentication failed.");
+                        }
+                        break;
+                    }
+                    case "ACTION_CREATE_MESSAGE": {
+                        if (!this.authMessage(ws)) return;
+                        if (typeof message.data.content !== "string" || typeof message.data.channel !== "object" || typeof message.data.channel._id !== "string") throw new Error("msg: invalid fields in json payload");
+                        
+                        const messageContent = message.data.content.trim();
+                        if (messageContent.length > 2000) return;
+                        if (message.data.channel._id.length !== 24) throw new Error("msg: payload has invalid id"); // MONGODB ONLY!!
+
+                        // Check if the user is in that channel before broadcasting the message
+                        if (!ws.channels.includes(message.data.channel._id)) return ws.close(4008, "Not authorized to perform action.");
+
+                        this.broadcast(message.data.channel._id, this.packet("EVENT_CREATE_MESSAGE", {
+                            content: messageContent,
+                            channel: {
+                                _id: message.data.channel._id
+                            },
+                            author: {
+                                _id: ws.session.user._id,
+                                username: ws.session.user.username
+                            }
+                        }));
+
+                        break;
+                    }
+                    }
+                } catch(e) {
+                    console.error("gateway:", e);
+                    return ws.close(4000, "Error while handling payload.");
+                }
             });
         });
     }
 }
 
+GatewayServer.prototype.broadcast = function(channelId, data) {
+    this.wss.clients.forEach((client) => {
+        if (this.clientReady(client) && client.channels.includes(channelId)) client.send(data);
+    });
+};
+
+GatewayServer.prototype.clientReady = function(ws) {
+    return ws.readyState === WebSocket.OPEN && ws.session && ws.session.authenticated;
+};
+
+GatewayServer.prototype.authMessage = function(ws) {
+    if (!this.clientReady(ws)) {
+        ws.close(4007, "Not authenticated.");
+        return false;
+    }
+    return true;
+};
+
+GatewayServer.prototype.packet = function(op, data) {
+    if (typeof op === "string") op = getOpcodeByName(op);
+    return `${op}${opcodeSeparator}${JSON.stringify(data)}`;
+};
+
 module.exports = GatewayServer;

brainlet/api/v2/gateway/messageparser.js

@@ -1,18 +1,42 @@
-const config = require("../../../config");
-
 const opcodes = {
-    0: "HELLO"
+    0: { name: "HELLO", data: "JSON" },
+    1: { name: "YOO", data: "JSON" },
+    2: { name: "YOO_ACK", data: "JSON" },
+    3: { name: "ACTION_CREATE_MESSAGE", data: "JSON" },
+    4: { name: "EVENT_CREATE_MESSAGE", data: "JSON" }
 };
 
+const opcodeSeparator = "@";
+
 const parseMessage = (message) => {
-    if (typeof message !== "string") throw new Error("GatewayMessageParser: Message is not a string");
+    if (typeof message !== "string") throw new Error("msg: message not a string");
-    if (message.length < 1) throw new Error("GatewayMessageParser: Message has less than 1 character");
+    const stringParts = message.split(opcodeSeparator);
-    if (message.length > config.gatewayMaxStringPayloadLength) throw new Error(`GatewayMessageParser: Message has more than ${config.gatewayMaxStringPayloadLength} characters`);
+    if (stringParts < 2) throw new Error("msg: message does not split into more than 2 parts");
-    const op = parseInt(message[0]);
+    const components = [ stringParts.shift(), stringParts.join(opcodeSeparator) ];
-    if (!op || isNaN(op)) throw new Error("GatewayMessageParser: Message has invalid opcode");      
+    const op = parseInt(components[0]);
-    const opcodeName = opcodes[op];
+    if (isNaN(op)) throw new Error(`msg: message does not contain valid opcode: ${op}`);
-    if (!opcodeName) throw new Error("GatewayMessageParser: Message has unknown opcode");
 
+    const opcodeData = opcodes[op];
+    let data = components[1];
+    if (!opcodeData) throw new Error(`msg: message contains unknown opcode ${op}`);
+    if (opcodeData.data === "JSON") {
+        data = JSON.parse(data);
+    } else if (opcodeData.data === "string") {
+        data = data.toString(); // NOTE: This isnt needed lol
+    } else {
+        throw new Error(`msg: invalid data type on opcode ${op}`);
+    }
+
+    return {
+        opcode: op,
+        data: data, 
+        dataType: opcodeData.data,
+        opcodeType: opcodeData.name || null
+    };
 };
 
-module.exports = { parseMessage };
+const getOpcodeByName = (name) => {
+    for (const [key, value] of Object.entries(opcodes)) if (value.name === name) return key;
+};
+
+module.exports = { opcodes, parseMessage, opcodeSeparator, getOpcodeByName };

brainlet/app/gatewaytest/index.html

@@ -0,0 +1,106 @@
+<html>
+    <head>
+        <script>
+            const opcodes = {
+                0: { name: "HELLO", data: "JSON" },
+                1: { name: "YOO", data: "JSON" },
+                2: { name: "YOO_ACK", data: "JSON" },
+                3: { name: "ACTION_CREATE_MESSAGE", data: "JSON" },
+                4: { name: "EVENT_CREATE_MESSAGE", data: "JSON" }
+            };
+
+            const opcodeSeparator = "@";
+
+            const parseMessage = (message) => {
+                if (typeof message !== "string") throw new Error("msg: message not a string");
+                const stringParts = message.split(opcodeSeparator);
+                if (stringParts < 2) throw new Error("msg: message does not split into more than 2 parts");
+                const components = [ stringParts.shift(), stringParts.join(opcodeSeparator) ];
+                const op = parseInt(components[0]);
+                if (isNaN(op)) throw new Error(`msg: message does not contain valid opcode: ${op}`);
+
+                const opcodeData = opcodes[op];
+                let data = components[1];
+                if (!opcodeData) throw new Error(`msg: message contains unknown opcode ${op}`);
+                if (opcodeData.data === "JSON") {
+                    data = JSON.parse(data);
+                } else if (opcodeData.data === "string") {
+                    data = data.toString(); // NOTE: This isnt needed lol
+                } else {
+                    throw new Error(`msg: invalid data type on opcode ${op}`);
+                }
+
+                return {
+                    opcode: op,
+                    data: data, 
+                    dataType: opcodeData.data,
+                    opcodeType: opcodeData.name || null
+                };
+            };
+
+            const getOpcodeByName = (name) => {
+                for (const [key, value] of Object.entries(opcodes)) if (value.name === name) return key;
+            };
+
+
+            class GatewayConnection {
+                constructor(token) {
+                    this.ws = new WebSocket("ws://localhost:3005/gateway?v=2");
+                    
+                    this.handshakeCompleted = false;
+
+                    this.ws.onopen = () => console.log("gateway: open");
+                    this.ws.onclose = (e) => {
+                        this.handshakeCompleted = false;
+                        console.log(`gateway: close: ${e.code}:${e.reason}`);
+                    }
+                    this.ws.onmessage = (message) => {
+                        try {
+                            const packet = parseMessage(message.data);
+                            if (!packet) return console.error("gateway: invalid packet from server");
+                            
+                            switch (packet.opcodeType) {
+                            case "HELLO": {
+                                // Got HELLO from server, send YOO as soon as possible
+                                console.log("gateway: got HELLO", packet.data);
+                                console.log("gateway: sending YOO");
+                                this.ws.send(this.packet("YOO", { token }));
+                                break;
+                            }
+                            case "YOO_ACK": {
+                                // Server accepted connection
+                                console.log("gateway: got YOO_ACK", packet.data);
+                                this.handshakeCompleted = true;
+                                console.log("gateway: handshake complete");
+                                break;
+                            }
+                            case "EVENT_CREATE_MESSAGE": {
+                                // New message
+                                console.log("gateway: got new message", packet.data);
+                                break;
+                            }
+                            default: {
+                                console.log("gateway: got unknown packet", message.data);
+                                break;
+                            }
+                            }
+                        } catch(e) {
+                            return console.error("gateway:", e);
+                        }
+                    };
+                }
+            }
+
+            GatewayConnection.prototype.packet = function(op, data) {
+                if (typeof op === "string") op = getOpcodeByName(op);
+                return `${op}${opcodeSeparator}${JSON.stringify(data)}`;
+            };
+
+            const connection = new GatewayConnection(localStorage.getItem("token"));
+        </script>
+    </head>
+
+    <body>
+
+    </body>
+</html>

brainlet/common/auth/authfunctions.js

@@ -15,50 +15,35 @@ const redirect = (res, status=401, url=undefined) => {
     res.redirect(url);
 };
 
+const checkToken = (token, minPermissionLevel=config.roleMap.RESTRICTED) => {
+    return new Promise((resolve, reject) => {
+        if (!token) reject("no token provided");
+        jwt.verify(token, secret.jwtPrivateKey, {}, async (err, data) => {
+            if (err) return reject(err);
+            if (!data || !data.username) return reject("invalid token");
+            const user = await User.findByUsername(data.username);
+            if (!user) return reject("user does not exist");
+
+            let permissionLevel = config.roleMap[user.role];
+            if (!permissionLevel) permissionLevel = 0;
+
+            if (permissionLevel < minPermissionLevel) reject("user does not have the required permission level");
+            resolve(user);
+        });
+    });
+};
+
 function authenticateEndpoint(callback, url=undefined, minPermissionLevel=config.roleMap.RESTRICTED) {
     return (req, res) => {
         const token = req.cookies.token;
-        if (!token) {
+        if (!token) return redirect(res, 403, url);
-            redirect(res, 403, url);
+        checkToken(token, minPermissionLevel).then((user) => {
-            return;
+            if (!user) return redirect(res, 403, url);
-        }
-    
-        jwt.verify(token, secret.jwtPrivateKey, {}, async (err, data) => {
-            if (err) {
-                redirect(res, 401, url);
-                return;
-            }
-    
-            if (!data) {
-                redirect(res, 401, url);
-                return;
-            }
-    
-            if (!data.username) {
-                redirect(res, 401, url);
-                return;
-            }
-    
-            const user = await User.findByUsername(data.username);
-    
-            if (!user) {
-                redirect(res, 401, url);
-                return;
-            }
-
-            let permissionLevel = config.roleMap[user.role];
-            if (!permissionLevel) {
-                permissionLevel = 0;
-            }
-
-            if (permissionLevel < minPermissionLevel) {
-                redirect(res, 401, url);
-                return;
-            }
-    
             callback(req, res, user);
+        }).catch(() => {
+            return redirect(res, 403, url);
         });
     };
 }
 
-module.exports = { authenticateEndpoint };
+module.exports = { authenticateEndpoint, checkToken };

brainlet/config.js

@@ -8,7 +8,7 @@ module.exports = {
     //        specialCode: ''
     //    }
     //},
-    mongoUrl: 'mongodb://localhost:27017/app',
+    mongoUrl: 'mongodb://192.168.0.105:27017/app',
     bcryptRounds: 10,
     roleMap: {
         'BANNED': 0,

brainlet/index.js

@@ -8,11 +8,13 @@ const http = require("http");
 
 const { authenticateEndpoint } = require("./common/auth/authfunctions");
 const GatewayServer = require("./api/v1/gateway/index");
+const GatewayServerV2 = require("./api/v2/gateway/index");
 
 const app = express();
 const httpServer = http.createServer(app);
 
 const gateway = new GatewayServer(httpServer);
+const gatewayv2 = new GatewayServerV2({ server: httpServer });
 
 app.use(express.urlencoded({ extended: false }));
 app.use(express.json());

brainlet/models/User.js

@@ -67,7 +67,10 @@ User.findByUsername = async function(username) {
     return await User.findOne({ username }).exec(); 
 };
 
-User.getPulicFields = function() {
+User.getPulicFields = function(isPartial=false) {
+    if (isPartial) {
+        return "username _id color";
+    }
     return "username role _id color";
 };