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index.js
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286 lines (245 loc) · 8.45 KB
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const createTorrent = require('create-torrent')
const debug = require('debug')('instant.io')
const dragDrop = require('drag-drop')
const escapeHtml = require('escape-html')
const get = require('simple-get')
const formatDistance = require('date-fns/formatDistance')
const path = require('path')
const prettierBytes = require('prettier-bytes')
const throttle = require('throttleit')
const thunky = require('thunky')
const uploadElement = require('upload-element')
const WebTorrent = require('webtorrent')
const JSZip = require('jszip')
const SimplePeer = require('simple-peer')
const util = require('./util')
globalThis.WEBTORRENT_ANNOUNCE = createTorrent.announceList
.map(function (arr) {
return arr[0]
})
.filter(function (url) {
return url.indexOf('wss://') === 0 || url.indexOf('ws://') === 0
})
const DISALLOWED = [
'6feb54706f41f459f819c0ae5b560a21ebfead8f'
]
const getClient = thunky(function (cb) {
getRtcConfig(function (err, rtcConfig) {
if (err) util.error(err)
const client = new WebTorrent({
tracker: {
rtcConfig: {
...SimplePeer.config,
...rtcConfig
}
}
})
window.client = client // for easier debugging
client.on('warning', util.warning)
client.on('error', util.error)
cb(null, client)
})
})
init()
function init () {
if (!WebTorrent.WEBRTC_SUPPORT) {
util.error('This browser is unsupported. Please use a browser with WebRTC support.')
}
// For performance, create the client immediately
getClient(function () {})
// Seed via upload input element
const upload = document.querySelector('input[name=upload]')
if (upload) {
uploadElement(upload, function (err, files) {
if (err) return util.error(err)
files = files.map(function (file) { return file.file })
onFiles(files)
})
}
// Seed via drag-and-drop
dragDrop('body', onFiles)
// Download via input element
const form = document.querySelector('form')
if (form) {
form.addEventListener('submit', function (e) {
e.preventDefault()
downloadTorrent(document.querySelector('form input[name=torrentId]').value.trim())
})
}
// Download by URL hash
onHashChange()
window.addEventListener('hashchange', onHashChange)
function onHashChange () {
const hash = decodeURIComponent(window.location.hash.substring(1)).trim()
if (hash !== '') downloadTorrent(hash)
}
// Register a protocol handler for "magnet:" (will prompt the user)
if ('registerProtocolHandler' in navigator) {
navigator.registerProtocolHandler('magnet', window.location.origin + '#%s', 'Instant.io')
}
// Register a service worker
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('/sw.js')
}
}
function getRtcConfig (cb) {
// WARNING: This is *NOT* a public endpoint. Do not depend on it in your app.
get.concat({
url: '/__rtcConfig__',
timeout: 5000
}, function (err, res, data) {
if (err || res.statusCode !== 200) {
cb(new Error('Could not get WebRTC config from server. Using default (without TURN).'))
} else {
try {
data = JSON.parse(data)
} catch (err) {
return cb(new Error('Got invalid WebRTC config from server: ' + data))
}
debug('got rtc config: %o', data.rtcConfig)
cb(null, data.rtcConfig)
}
})
}
function onFiles (files) {
debug('got files:')
files.forEach(function (file) {
debug(' - %s (%s bytes)', file.name, file.size)
})
// .torrent file = start downloading the torrent
files.filter(isTorrentFile).forEach(downloadTorrentFile)
// everything else = seed these files
seed(files.filter(isNotTorrentFile))
}
function isTorrentFile (file) {
const extname = path.extname(file.name).toLowerCase()
return extname === '.torrent'
}
function isNotTorrentFile (file) {
return !isTorrentFile(file)
}
function downloadTorrent (torrentId) {
const disallowed = DISALLOWED.some(function (infoHash) {
return torrentId.indexOf(infoHash) >= 0
})
if (disallowed) {
util.log('File not found ' + torrentId)
} else {
util.log('Downloading torrent from ' + torrentId)
getClient(function (err, client) {
if (err) return util.error(err)
client.add(torrentId, onTorrent)
})
}
}
function downloadTorrentFile (file) {
util.unsafeLog('Downloading torrent from <strong>' + escapeHtml(file.name) + '</strong>')
getClient(function (err, client) {
if (err) return util.error(err)
client.add(file, onTorrent)
})
}
function seed (files) {
if (files.length === 0) return
util.log('Seeding ' + files.length + ' files')
// Seed from WebTorrent
getClient(function (err, client) {
if (err) return util.error(err)
client.seed(files, onTorrent)
})
}
function onTorrent (torrent) {
torrent.on('warning', util.warning)
torrent.on('error', util.error)
const upload = document.querySelector('input[name=upload]')
upload.value = upload.defaultValue // reset upload element
const torrentFileName = path.basename(torrent.name, path.extname(torrent.name)) + '.torrent'
util.log('"' + torrentFileName + '" contains ' + torrent.files.length + ' files:')
torrent.files.forEach(function (file) {
util.unsafeLog(' - ' + escapeHtml(file.name) + ' (' + escapeHtml(prettierBytes(file.length)) + ')')
})
util.log('Torrent info hash: ' + torrent.infoHash)
util.unsafeLog(
'<a href="/#' + escapeHtml(torrent.infoHash) + '" this link with anyone you want to download this torrent:\', this.href);return false;">[Share link]</a> ' +
'<a href="' + escapeHtml(torrent.magnetURI) + '" target="_blank">[Magnet URI]</a> ' +
'<a href="' + escapeHtml(torrent.torrentFileBlobURL) + '" target="_blank" download="' + escapeHtml(torrentFileName) + '">[Download .torrent]</a>'
)
function updateSpeed () {
const progress = (100 * torrent.progress).toFixed(1)
let remaining
if (torrent.done) {
remaining = 'Done.'
} else {
remaining = torrent.timeRemaining !== Infinity
? formatDistance(torrent.timeRemaining, 0, { includeSeconds: true })
: 'Infinity years'
remaining = remaining[0].toUpperCase() + remaining.substring(1) + ' remaining.'
}
util.updateSpeed(
'<b>Peers:</b> ' + torrent.numPeers + ' ' +
'<b>Progress:</b> ' + progress + '% ' +
'<b>Download speed:</b> ' + prettierBytes(window.client.downloadSpeed) + '/s ' +
'<b>Upload speed:</b> ' + prettierBytes(window.client.uploadSpeed) + '/s ' +
'<b>ETA:</b> ' + remaining
)
}
torrent.on('download', throttle(updateSpeed, 250))
torrent.on('upload', throttle(updateSpeed, 250))
setInterval(updateSpeed, 5000)
updateSpeed()
torrent.files.forEach(function (file) {
// append file
file.appendTo(util.logElem, {
maxBlobLength: 2 * 1000 * 1000 * 1000 // 2 GB
}, function (err, elem) {
if (err) return util.error(err)
})
// append download link
file.getBlobURL(function (err, url) {
if (err) return util.error(err)
const a = document.createElement('a')
a.target = '_blank'
a.download = file.name
a.href = url
a.textContent = 'Download ' + file.name
util.appendElemToLog(a)
})
})
const downloadZip = document.createElement('a')
downloadZip.href = '#'
downloadZip.target = '_blank'
downloadZip.textContent = 'Download all files as zip'
downloadZip.addEventListener('click', function (event) {
let addedFiles = 0
const zipFilename = path.basename(torrent.name, path.extname(torrent.name)) + '.zip'
let zip = new JSZip()
event.preventDefault()
torrent.files.forEach(function (file) {
file.getBlob(function (err, blob) {
addedFiles += 1
if (err) return util.error(err)
// add file to zip
zip.file(file.path, blob)
// start the download when all files have been added
if (addedFiles === torrent.files.length) {
if (torrent.files.length > 1) {
// generate the zip relative to the torrent folder
zip = zip.folder(torrent.name)
}
zip.generateAsync({ type: 'blob' })
.then(function (blob) {
const url = URL.createObjectURL(blob)
const a = document.createElement('a')
a.download = zipFilename
a.href = url
a.click()
setTimeout(function () {
URL.revokeObjectURL(url)
}, 30 * 1000)
}, util.error)
}
})
})
})
util.appendElemToLog(downloadZip)
}