92 lines
2.5 KiB
TypeScript
92 lines
2.5 KiB
TypeScript
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import { logger } from '../helpers/logger'
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import * as express from 'express'
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import * as http from 'http'
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import * as bitTorrentTracker from 'bittorrent-tracker'
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import * as proxyAddr from 'proxy-addr'
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import { Server as WebSocketServer } from 'ws'
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import { CONFIG, TRACKER_RATE_LIMITS } from '../initializers/constants'
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const TrackerServer = bitTorrentTracker.Server
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const trackerRouter = express.Router()
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let peersIps = {}
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let peersIpInfoHash = {}
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runPeersChecker()
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const trackerServer = new TrackerServer({
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http: false,
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udp: false,
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ws: false,
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dht: false,
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filter: function (infoHash, params, cb) {
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let ip: string
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if (params.type === 'ws') {
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ip = params.socket.ip
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} else {
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ip = params.httpReq.ip
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}
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const key = ip + '-' + infoHash
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peersIps[ip] = peersIps[ip] ? peersIps[ip] + 1 : 1
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peersIpInfoHash[key] = peersIpInfoHash[key] ? peersIpInfoHash[key] + 1 : 1
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if (peersIpInfoHash[key] > TRACKER_RATE_LIMITS.ANNOUNCES_PER_IP_PER_INFOHASH) {
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return cb(new Error(`Too many requests (${peersIpInfoHash[ key ]} of ip ${ip} for torrent ${infoHash}`))
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}
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return cb()
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}
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})
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trackerServer.on('error', function (err) {
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logger.error('Error in tracker.', { err })
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})
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trackerServer.on('warning', function (err) {
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logger.warn('Warning in tracker.', { err })
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})
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const onHttpRequest = trackerServer.onHttpRequest.bind(trackerServer)
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trackerRouter.get('/tracker/announce', (req, res) => onHttpRequest(req, res, { action: 'announce' }))
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trackerRouter.get('/tracker/scrape', (req, res) => onHttpRequest(req, res, { action: 'scrape' }))
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function createWebsocketServer (app: express.Application) {
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const server = http.createServer(app)
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const wss = new WebSocketServer({ server: server, path: '/tracker/socket' })
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wss.on('connection', function (ws, req) {
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const ip = proxyAddr(req, CONFIG.TRUST_PROXY)
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ws['ip'] = ip
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trackerServer.onWebSocketConnection(ws)
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})
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return server
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}
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// ---------------------------------------------------------------------------
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export {
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trackerRouter,
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createWebsocketServer
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}
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// ---------------------------------------------------------------------------
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function runPeersChecker () {
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setInterval(() => {
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logger.debug('Checking peers.')
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for (const ip of Object.keys(peersIpInfoHash)) {
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if (peersIps[ip] > TRACKER_RATE_LIMITS.ANNOUNCES_PER_IP) {
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logger.warn('Peer %s made abnormal requests (%d).', ip, peersIps[ip])
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}
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}
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peersIpInfoHash = {}
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peersIps = {}
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}, TRACKER_RATE_LIMITS.INTERVAL)
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}
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