iceshrimp/packages/backend/src/server/api/streaming.ts

import type * as http from "node:http";
import { EventEmitter } from "events";
import type { ParsedUrlQuery } from "querystring";
import * as websocket from "websocket";

import { subscriber as redisClient } from "@/db/redis.js";
import { Users } from "@/models/index.js";
import MainStreamConnection from "./stream/index.js";
import authenticate from "./authenticate.js";
import { apiLogger } from "@/server/api/logger.js";
import { MastodonStreamingConnection } from "@/server/api/mastodon/streaming/index.js";

export const streamingLogger = apiLogger.createSubLogger("streaming");

export const initializeStreamingServer = (server: http.Server) => {
	// Init websocket server
	const ws = new websocket.server({
		httpServer: server,
	});

	ws.on("request", async (request) => {
		const q = request.resourceURL.query as ParsedUrlQuery;
		const headers = request.httpRequest.headers["sec-websocket-protocol"] || "";
		const cred = q.i || q.access_token || headers;
		const accessToken = cred.toString();

		const [user, app] = await authenticate(
			request.httpRequest.headers.authorization,
			accessToken,
		).catch((err) => {
			request.reject(403, err.message);
			return [];
		});
		if (typeof user === "undefined") {
			return;
		}

		if (user?.isSuspended) {
			request.reject(400);
			return;
		}

		const connection = request.accept();

		const ev = new EventEmitter();

		async function onRedisMessage(_: string, data: string) {
			const parsed = JSON.parse(data);
			ev.emit(parsed.channel, parsed.message);
		}

		redisClient.on("message", onRedisMessage);
		const host = `https://${request.host}`;
		const prepareStream = q.stream?.toString();

		const isMastodon = request.resourceURL.pathname?.endsWith('/api/v1/streaming');
		if (isMastodon && !request.resourceURL.pathname?.startsWith('/mastodon')) {
			streamingLogger.warn(`Received connect from mastodon on incorrect path: ${request.resourceURL.pathname}`);
		}

		const main = isMastodon
			? new MastodonStreamingConnection(connection, ev, user, app, q)
			: new MainStreamConnection(connection, ev, user, app, host, accessToken, prepareStream);

		const intervalId = user
			? setInterval(() => {
					Users.update(user.id, {
						lastActiveDate: new Date(),
					});
			  }, 1000 * 60 * 5)
			: null;
		if (user) {
			Users.update(user.id, {
				lastActiveDate: new Date(),
			});
		}

		connection.once("close", () => {
			ev.removeAllListeners();
			main.dispose();
			redisClient.off("message", onRedisMessage);
			if (intervalId) clearInterval(intervalId);
		});

		connection.on("message", async (data) => {
			if (data.type === "utf8" && data.utf8Data === "ping") {
				connection.send("pong");
			}
		});
	});
};