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