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/*
Fosscord: A FOSS re-implementation and extension of the Discord.com backend.
Copyright (C) 2023 Fosscord and Fosscord Contributors
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/* eslint-disable @typescript-eslint/ban-ts-comment */
import WS from "ws";
import { genSessionId, WebSocket } from "@fosscord/gateway";
import { Send } from "../util/Send";
import { CLOSECODES, OPCODES } from "../util/Constants";
import { setHeartbeat } from "../util/Heartbeat";
import { IncomingMessage } from "http";
import { Close } from "./Close";
import { Message } from "./Message";
import { Deflate, Inflate } from "fast-zlib";
import { URL } from "url";
import { Config, ErlpackType } from "@fosscord/util";
let erlpack: ErlpackType | null = null;
try {
erlpack = require("erlpack") as ErlpackType;
} catch (e) {
// empty
}
// TODO: check rate limit
// TODO: specify rate limit in config
// TODO: check msg max size
export async function Connection(
this: WS.Server,
socket: WebSocket,
request: IncomingMessage,
) {
const forwardedFor = Config.get().security.forwadedFor;
const ipAddress = forwardedFor
? (request.headers[forwardedFor] as string)
: request.socket.remoteAddress;
socket.ipAddress = ipAddress;
//Create session ID when the connection is opened. This allows gateway dump to group the initial websocket messages with the rest of the conversation.
const session_id = genSessionId();
socket.session_id = session_id; //Set the session of the WebSocket object
try {
// @ts-ignore
socket.on("close", Close);
// @ts-ignore
socket.on("message", Message);
socket.on("error", (err) => console.error("[Gateway]", err));
// console.log(
// `[Gateway] New connection from ${socket.ipAddress}, total ${this.clients.size}`,
// );
if (process.env.WS_LOGEVENTS)
[
"close",
"error",
"upgrade",
//"message",
"open",
"ping",
"pong",
"unexpected-response",
].forEach((x) => {
socket.on(x, (y) => console.log(x, y));
});
const { searchParams } = new URL(`http://localhost${request.url}`);
// @ts-ignore
socket.encoding = searchParams.get("encoding") || "json";
if (!["json", "etf"].includes(socket.encoding))
return socket.close(CLOSECODES.Decode_error);
if (socket.encoding === "etf" && !erlpack)
throw new Error("Erlpack is not installed: 'npm i erlpack'");
socket.version = Number(searchParams.get("version")) || 8;
if (socket.version != 8)
return socket.close(CLOSECODES.Invalid_API_version);
// @ts-ignore
socket.compress = searchParams.get("compress") || "";
if (socket.compress) {
if (socket.compress !== "zlib-stream")
return socket.close(CLOSECODES.Decode_error);
socket.deflate = new Deflate();
socket.inflate = new Inflate();
}
socket.events = {};
socket.member_events = {};
socket.permissions = {};
socket.sequence = 0;
setHeartbeat(socket);
await 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);
}
}
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