✨ Base Server

.vscode/launch.json

@@ -0,0 +1,17 @@
+{
+	// Use IntelliSense to learn about possible attributes.
+	// Hover to view descriptions of existing attributes.
+	// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"sourceMaps": true,
+			"type": "node",
+			"request": "launch",
+			"name": "Launch Server",
+			"program": "${workspaceFolder}/dist/index.js",
+			"preLaunchTask": "tsc: build - tsconfig.json",
+			"outFiles": ["${workspaceFolder}/dist/**/*.js"]
+		}
+	]
+}

client.js

@@ -1,9 +1,11 @@
+require("missing-native-js-functions");
 const WebSocket = require("ws");
+const Constants = require("./dist/util/Constants");
 
 const ws = new WebSocket("ws://127.0.0.1:8080");
 
 ws.on("open", () => {
-	ws.send(JSON.stringify({ req_type: "new_auth" }));
+	// ws.send(JSON.stringify({ req_type: "new_auth" }));
 	// ws.send(JSON.stringify({ req_type: "check_auth", token: "" }));
 	// op: 0,
 	// d: {},
@@ -11,6 +13,33 @@ ws.on("open", () => {
 	// t: "GATEWAY_EVENT_NAME",
 });
 
-ws.on("message", (data) => {
+function send(data) {
+	ws.send(JSON.stringify(data));
+}
+
+ws.on("message", (buffer) => {
+	let data = JSON.parse(buffer.toString());
 	console.log(data);
+
+	switch (data.op) {
+		case 10:
+			setIntervalNow(() => {
+				send({ op: 1 });
+			}, data.d.heartbeat_interval);
+
+			send({
+				op: 2,
+				d: {
+					token: "",
+					intents: 0n,
+					properties: {},
+				},
+			});
+
+			break;
+	}
+});
+
+ws.on("close", (code, reason) => {
+	console.log(code, reason, Constants.CLOSECODES[code]);
 });

src/Server.ts

@@ -0,0 +1,16 @@
+import { db } from "discord-server-util";
+import { Server as WebSocketServer } from "ws";
+import { Connection } from "./events/Connection";
+
+export class Server {
+	public ws: WebSocketServer;
+	constructor() {
+		this.ws = new WebSocketServer({ port: 8080, maxPayload: 4096 });
+		this.ws.on("connection", Connection);
+	}
+
+	async listen(): Promise<void> {
+		await db.init();
+		console.log("listening");
+	}
+}

src/events/Close.ts

@@ -0,0 +1,6 @@
+import WebSocket from "ws";
+import { Message } from "./Message";
+
+export function Close(this: WebSocket, code: number, reason: string) {
+	this.off("message", Message);
+}

src/events/Connection.ts

@@ -0,0 +1,46 @@
+import WebSocket, { Server } from "../util/WebSocket";
+import { IncomingMessage } from "http";
+import { Close } from "./Close";
+import { Message } from "./Message";
+import { setHeartbeat } from "../util/setHeartbeat";
+import { Send } from "../util/Send";
+import { CLOSECODES, OPCODES } from "../util/Constants";
+
+// TODO: check rate limit
+// TODO: specify rate limit in config
+
+export function Connection(this: Server, socket: WebSocket, request: IncomingMessage) {
+	try {
+		socket.on("close", Close);
+		socket.on("message", Message);
+
+		const { searchParams } = new URL(`http://localhost${request.url}`);
+		// @ts-ignore
+		socket.encoding = searchParams.get("encoding") || "json";
+		if (!["json", "etf"].includes(socket.encoding)) return socket.close(CLOSECODES.Decode_error);
+
+		// @ts-ignore
+		socket.version = Number(searchParams.get("version")) || 8;
+		if (socket.version != 8) return socket.close(CLOSECODES.Invalid_API_version);
+
+		// @ts-ignore
+		socket.compression = searchParams.get("compress") || "";
+		// TODO: compression
+
+		setHeartbeat(socket);
+
+		Send(socket, {
+			op: OPCODES.Hello,
+			d: {
+				heartbeat_interval: 1000 * 30,
+			},
+		});
+
+		socket.readyTimeout = setTimeout(() => {
+			return socket.close(CLOSECODES.Session_timed_out);
+		}, 1000 * 30);
+	} catch (error) {
+		console.error(error);
+		return socket.close(CLOSECODES.Unknown_error);
+	}
+}

src/events/Message.ts

@@ -0,0 +1,36 @@
+import WebSocket, { Data } from "../util/WebSocket";
+import erlpack from "erlpack";
+import OPCodeHandlers from "../opcodes";
+import { Payload, CLOSECODES } from "../util/Constants";
+import { instanceOf } from "lambert-server";
+
+const PayloadSchema = {
+	op: Number,
+	$d: Object,
+	$s: Number,
+	$t: String,
+};
+
+export async function Message(this: WebSocket, buffer: Data) {
+	// TODO: compression
+	var data: Payload;
+
+	try {
+		if (this.encoding === "etf" && buffer instanceof Buffer) data = erlpack.unpack(buffer);
+		else if (this.encoding === "json" && typeof buffer === "string") data = JSON.parse(buffer);
+		if (!instanceOf(PayloadSchema, data)) throw "invalid data";
+	} catch (error) {
+		return this.close(CLOSECODES.Decode_error);
+	}
+
+	// @ts-ignore
+	const OPCodeHandler = OPCodeHandlers[data.op];
+	if (!OPCodeHandler) return this.close(CLOSECODES.Unknown_opcode);
+
+	try {
+		return await OPCodeHandler.call(this, data);
+	} catch (error) {
+		console.error(error);
+		return this.close(CLOSECODES.Unknown_error);
+	}
+}

src/index.ts

@@ -1,43 +1,8 @@
-import WebSocket from "ws";
+process.on("uncaughtException", console.error);
-import DB from "./extras/Database";
+process.on("unhandledRejection", console.error);
-import { message_dev } from "./assets/datastru";
+setTimeout(() => {}, 100000000);
-import { v4 } from "uuid";
 
-class Server {
+import { Server } from "./Server";
-	db: any;
-	constructor() {
-		this.db = DB;
-	}
 
-	async listen(): Promise<void> {
+const server = new Server();
-		await this.db.init();
+server.listen();
-		const wss = new WebSocket.Server({ port: 8080 });
-
-		wss.on("connection", (ws) => {
-			ws.on("message", async (msg: any) => {
-				const message: message_dev = msg;
-
-				if (message.req_type) {
-					switch (message.req_type) {
-						case "new_auth":
-							const token = v4();
-							await this.db.data.auth.push({ token });
-							return ws.send({ new_token: token });
-						case "check_auth":
-							if (!message.token) {
-								return ws.send({ error: "token not providen" });
-							}
-							return this.db.data.auth({ token: message.token }).get();
-					}
-				} else {
-					ws.send({ error: "req_type not providen" });
-				}
-			});
-
-			ws.send("connected");
-		});
-	}
-}
-
-const s = new Server();
-s.listen();

src/util/Constants.ts

@@ -4,6 +4,7 @@ export enum OPCODES {
 	Identify,
 	Presence_Update,
 	Voice_State_Update,
+	Dummy_Value, // ? What is opcode 5?
 	Resume,
 	Reconnect,
 	Request_Guild_Members,

src/util/Send.ts

@@ -0,0 +1,21 @@
+import erlpack from "erlpack";
+import { promisify } from "util";
+import { Payload } from "../util/Constants";
+
+import WebSocket from "./WebSocket";
+
+export async function Send(socket: WebSocket, data: Payload) {
+	let buffer: Buffer | string;
+	if (socket.encoding === "etf") buffer = erlpack.pack(data);
+	// TODO: encode circular object
+	else if (socket.encoding === "json") buffer = JSON.stringify(data);
+
+	// TODO: compression
+
+	return new Promise((res, rej) => {
+		socket.send(buffer, (err) => {
+			if (err) return rej(err);
+			return res(null);
+		});
+	});
+}

src/util/WebSocket.ts

@@ -0,0 +1,13 @@
+import WS, { Server, Data } from "ws";
+
+interface WebSocket extends WS {
+	version: number;
+	userid: bigint;
+	encoding: "etf" | "json";
+	compress?: "zlib-stream";
+	heartbeatTimeout: NodeJS.Timeout;
+	readyTimeout: NodeJS.Timeout;
+}
+
+export default WebSocket;
+export { Server, Data };

src/util/setHeartbeat.ts

@@ -0,0 +1,10 @@
+import WebSocket from "./WebSocket";
+
+// TODO: make heartbeat timeout configurable
+export function setHeartbeat(socket: WebSocket) {
+	if (socket.heartbeatTimeout) clearTimeout(socket.heartbeatTimeout);
+
+	socket.heartbeatTimeout = setTimeout(() => {
+		return socket.close(4009);
+	}, 1000 * 30);
+}