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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'
import { VideoFileModel } from '../models/video/video-file'
import { parse } from 'url'
import { VideoStreamingPlaylistModel } from '../models/video/video-streaming-playlist'
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: async 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}`))
}
try {
const videoFileExists = await VideoFileModel.doesInfohashExist(infoHash)
if (videoFileExists === true) return cb()
const playlistExists = await VideoStreamingPlaylistModel.doesInfohashExist(infoHash)
if (playlistExists === true) return cb()
return cb(new Error(`Unknown infoHash ${infoHash}`))
} catch (err) {
logger.error('Error in tracker filter.', { err })
return cb(err)
}
}
})
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 createWebsocketTrackerServer (app: express.Application) {
const server = http.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, socket, head) => {
const pathname = parse(request.url).pathname
if (pathname === '/tracker/socket') {
wss.handleUpgrade(request, socket, 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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