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import { Server as TrackerServer } from 'bittorrent-tracker'
import express from 'express'
import { createServer } from 'http'
import LRUCache from 'lru-cache'
import proxyAddr from 'proxy-addr'
import { WebSocketServer } from 'ws'
import { logger } from '../helpers/logger'
import { CONFIG } from '../initializers/config'
import { LRU_CACHE, TRACKER_RATE_LIMITS } from '../initializers/constants'
import { VideoFileModel } from '../models/video/video-file'
import { VideoStreamingPlaylistModel } from '../models/video/video-streaming-playlist'
const trackerRouter = express.Router()
const blockedIPs = new LRUCache<string, boolean>({
max: LRU_CACHE.TRACKER_IPS.MAX_SIZE,
ttl: TRACKER_RATE_LIMITS.BLOCK_IP_LIFETIME
})
let peersIps = {}
let peersIpInfoHash = {}
runPeersChecker()
const trackerServer = new TrackerServer({
http: false,
udp: false,
ws: false,
filter: async function (infoHash, params, cb) {
if (CONFIG.TRACKER.ENABLED === false) {
return cb(new Error('Tracker is disabled on this instance.'))
}
let ip: string
if (params.type === 'ws') {
ip = params.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 (CONFIG.TRACKER.REJECT_TOO_MANY_ANNOUNCES && 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}`))
}
try {
if (CONFIG.TRACKER.PRIVATE === false) return cb()
const videoFileExists = await VideoFileModel.doesInfohashExistCached(infoHash)
if (videoFileExists === true) return cb()
const playlistExists = await VideoStreamingPlaylistModel.doesInfohashExistCached(infoHash)
if (playlistExists === true) return cb()
cb(new Error(`Unknown infoHash ${infoHash} requested by ip ${ip}`))
// Close socket connection and block IP for a few time
if (params.type === 'ws') {
blockedIPs.set(ip, true)
// setTimeout to wait filter response
setTimeout(() => params.socket.close(), 0)
}
} catch (err) {
logger.error('Error in tracker filter.', { err })
return cb(err)
}
}
})
if (CONFIG.TRACKER.ENABLED !== false) {
trackerServer.on('error', function (err) {
logger.error('Error in tracker.', { err })
})
trackerServer.on('warning', function (err) {
const message = err.message || ''
if (CONFIG.LOG.LOG_TRACKER_UNKNOWN_INFOHASH === false && message.includes('Unknown infoHash')) {
return
}
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 createWebsocketTrackerServer (app: express.Application) {
const server = createServer(app)
const wss = new WebSocketServer({ noServer: true })
wss.on('connection', function (ws, req) {
ws['ip'] = proxyAddr(req, CONFIG.TRUST_PROXY)
trackerServer.onWebSocketConnection(ws)
})
server.on('upgrade', (request: express.Request, socket, head) => {
if (request.url === '/tracker/socket') {
const ip = proxyAddr(request, CONFIG.TRUST_PROXY)
if (blockedIPs.has(ip)) {
logger.debug('Blocking IP %s from tracker.', ip)
socket.write('HTTP/1.1 403 Forbidden\r\n\r\n')
socket.destroy()
return
}
// FIXME: typings
return wss.handleUpgrade(request, socket as any, head, ws => wss.emit('connection', ws, request))
}
// Don't destroy socket, we have Socket.IO too
})
return server
}
// ---------------------------------------------------------------------------
export {
trackerRouter,
createWebsocketTrackerServer
}
// ---------------------------------------------------------------------------
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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