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// TODO: support blocklists
module.exports = WebTorrent
var Client = require('bittorrent-client')
var FSStorage = require('./lib/fs_storage')
var fs = require('fs')
var url = require('url')
var http = require('http')
var inherits = require('inherits')
var pump = require('pump')
var mime = require('mime')
var rangeParser = require('range-parser')
var extend = require('extend.js')
inherits(WebTorrent, Client)
function WebTorrent (opts) {
var self = this
opts = opts || {}
if (opts.blocklist) opts.blocklist = parseBlocklist(opts.blocklist)
Client.call(self, opts)
if (opts.list) {
return
}
self._startServer()
self.on('torrent', function (torrent) {
self._onTorrent(torrent)
})
// TODO: add event that signals that all files that are "interesting" to the user have
// completed and handle it by stopping fetching additional data from the network
}
WebTorrent.prototype.add = function (torrentId, opts, cb) {
var self = this
if (!self.ready) {
return self.once('ready', self.add.bind(self, torrentId, opts, cb))
}
if (typeof opts === 'function') {
cb = opts
opts = {}
}
if (typeof cb !== 'function') cb = function () {}
opts = extend({
storage: FSStorage
}, opts)
self.index = opts.index
// Called once we have a torrentId that bittorrent-client can handle
function onTorrentId (torrentId) {
Client.prototype.add.call(self, torrentId, opts, cb)
}
if (Client.toInfoHash(torrentId)) {
// magnet uri, info hash, or torrent file can be handled by bittorrent-client
process.nextTick(function () {
onTorrentId(torrentId)
})
} else if (/^https?:/.test(torrentId)) {
// http or https url to torrent file
http.get(torrentId, function (res) {
res.pipe(concat(function (torrent) {
onTorrentId(torrent)
}))
}).on('error', function (err) {
cb(new Error('Error downloading torrent from ' + torrentId + '\n' + err.message))
})
} else {
// assume it's a filesystem path
fs.readFile(torrentId, function (err, torrent) {
if (err) {
return cb(new Error('Cannot add torrent "' + torrentId + '". Torrent id must be one of: magnet uri, ' +
'info hash, torrent file, http url, or filesystem path.'))
}
onTorrentId(torrent)
})
}
return self
}
WebTorrent.prototype._onTorrent = function (torrent) {
var self = this
// if no index specified, use largest file
if (typeof torrent.index !== 'number') {
var largestFile = torrent.files.reduce(function (a, b) {
return a.length > b.length ? a : b
})
torrent.index = torrent.files.indexOf(largestFile)
}
torrent.files[torrent.index].select()
self.index = torrent.index
self.torrent = torrent
}
WebTorrent.prototype._startServer = function () {
var self = this
self.server = http.createServer()
self.server.on('request', self._onRequest.bind(self))
}
WebTorrent.prototype._onRequest = function (req, res) {
var self = this
if (!self.ready) {
return self.once('ready', self._onRequest.bind(self, req, res))
}
var u = url.parse(req.url)
if (u.pathname === '/favicon.ico') {
return res.end()
}
if (u.pathname === '/') {
u.pathname = '/' + self.index
}
var i = Number(u.pathname.slice(1))
if (isNaN(i) || i >= self.torrent.files.length) {
res.statusCode = 404
return res.end()
}
var file = self.torrent.files[i]
var range = req.headers.range
res.setHeader('Accept-Ranges', 'bytes')
res.setHeader('Content-Type', mime.lookup(file.name))
if (!range) {
res.statusCode = 206
res.setHeader('Content-Length', file.length)
if (req.method === 'HEAD') {
return res.end()
}
pump(file.createReadStream(), res)
return
}
range = rangeParser(file.length, range)[0] // don't support multi-range reqs
res.statusCode = 206
var rangeStr = 'bytes ' + range.start + '-' + range.end + '/' + file.length
res.setHeader('Content-Range', rangeStr)
res.setHeader('Content-Length', range.end - range.start + 1)
if (req.method === 'HEAD') {
return res.end()
}
pump(file.createReadStream(range), res)
}
//
// HELPER METHODS
//
function parseBlocklist (filename) {
// TODO: support gzipped files
var blocklistData = fs.readFileSync(filename, { encoding: 'utf8' })
var blocklist = []
blocklistData.split('\n').forEach(function(line) {
var match = null
if ((match = /^\s*([^#].*)\s*:\s*([a-f0-9.:]+?)\s*-\s*([a-f0-9.:]+?)\s*$/.exec(line))) {
blocklist.push({
reason: match[1],
startAddress: match[2],
endAddress: match[3]
})
}
})
return blocklist
}
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