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|
#!/usr/bin/env node
var DHT = require('bittorrent-dht')
var EC = require('elliptic').ec
var ed25519 = new EC('ed25519')
var exec = require('child_process').exec
var glob = require('glob')
var fs = require('fs')
var hat = require('hat')
var net = require('net')
var Protocol = require('bittorrent-protocol')
var spawn = require('child_process').spawn
var ut_gittorrent = require('ut_gittorrent')
var ut_metadata = require('ut_metadata')
var WebTorrent = require('webtorrent')
var zeroFill = require('zero-fill')
var config = require('./config')
// BitTorrent client version string (used in peer ID).
// Generated from package.json major and minor version. For example:
// '0.16.1' -> '0016'
// '1.2.5' -> '0102'
//
var VERSION = require('./package.json').version
.match(/([0-9]+)/g).slice(0, 2).map(zeroFill(2)).join('')
function die (error) {
console.error(error)
process.exit(1)
}
var dht = new DHT({
bootstrap: config.dht.bootstrap
})
dht.listen(config.dht.listen)
var announcedRefs = {
}
var userProfile = {
repositories: {}
}
var key = create_or_read_keyfile()
function create_or_read_keyfile () {
if (!fs.existsSync(config.key)) {
var keypair = new EC('ed25519').genKeyPair()
fs.writeFileSync(config.key, JSON.stringify({
pub: keypair.getPublic('hex'),
priv: keypair.getPrivate('hex')
}))
}
// Okay, now the file exists, whether created here or not.
var key = JSON.parse(fs.readFileSync(config.key).toString())
return ed25519.keyPair({
priv: key.priv,
privEnc: 'hex',
pub: key.pub,
pubEnc: 'hex'
})
}
function bpad (n, buf) {
if (buf.length === n) return buf
if (buf.length < n) {
var b = new Buffer(n)
buf.copy(b, n - buf.length)
for (var i = 0; i < n - buf.length; i++) b[i] = 0
return b
}
}
dht.on('ready', function () {
// Spider all */.git dirs and announce all refs.
var repos = glob.sync('*/{,.git/}git-daemon-export-ok', {strict: false})
var count = repos.length
repos.forEach(function (repo) {
console.log('in repo ' + repo)
repo = repo.replace(/git-daemon-export-ok$/, '')
console.log(repo)
var reponame = repo.replace(/\/.git\/$/, '')
userProfile.repositories[reponame] = {}
var upload = spawn('git-upload-pack', ['--strict', repo])
upload.stdout.on('data', function (line) {
var lines = line.toString().split('\n')
lines.forEach(function (line) {
var arr = line.toString().split(' ')
if (arr.length < 2) {
return
}
var sha = arr[0].toString()
// First four chars are git-upload-pack's length-of-line metadata.
sha = sha.substring(4)
if (arr.length == 2) {
var ref = arr[1].toString()
var branch = ref.match(/^refs\/heads\/(.*)/)
// FIXME: Can't pull in too many branches.
// if (!branch) {
// branch = ref.match(/^refs\/remotes\/(.*)/)
// }
if (branch) {
userProfile.repositories[reponame][ref] = sha
}
if (branch && !announcedRefs[sha]) {
branch = branch[1]
console.log('Announcing ' + sha + ' for ' + branch + ' on repo ' + repo)
announcedRefs[sha] = repo
dht.announce(sha, config.dht.announce, function (err) {
if (err !== null) {
console.log('Announced ' + sha)
}
})
}
} else if (arr.length > 2 && arr[1].search(/^HEAD/) !== -1) {
// Probably the first line; line[0] has the hash, line[1] has HEAD,
// and beyond are the supported features.
userProfile.repositories[reponame]['HEAD'] = sha
}
})
// Callback counting for repos
count--
if (count <= 0) {
publish_mutable_key()
}
})
upload.stdout.on('end', function () {
console.log('end')
})
upload.on('exit', function (code) {
if (code !== 0) {
die('Failed: ' + code)
}
})
})
function publish_mutable_key () {
var json = JSON.stringify(userProfile)
if (json.length > 950) {
console.error("Can't publish mutable key: doesn't fit in 950 bytes.")
return false
}
var value = new Buffer(json.length)
value.write(json)
var sig = key.sign(value)
var opts = {
k: bpad(32, Buffer(key.getPublic().x.toArray())),
seq: 0,
v: value,
sig: Buffer.concat([
bpad(32, Buffer(sig.r.toArray())),
bpad(32, Buffer(sig.s.toArray()))
])}
console.log(json)
dht.put(opts, function (errors, hash) {
console.error('errors=', errors)
console.log('hash=', hash.toString('hex'))
})
}
net.createServer(function (socket) {
var wire = new Protocol()
wire.use(ut_gittorrent())
wire.use(ut_metadata())
socket.pipe(wire).pipe(socket)
wire.on('handshake', function (infoHash, peerId) {
console.log('Received handshake for ' + infoHash.toString('hex'))
var myPeerId = new Buffer('-WW' + VERSION + '-' + hat(48), 'utf8')
wire.handshake(new Buffer(infoHash), new Buffer(myPeerId))
})
wire.ut_gittorrent.on('generatePack', function (sha) {
console.error('calling git pack-objects')
var filename = sha + '.pack'
var stream = fs.createWriteStream(filename)
if (!announcedRefs[sha]) {
console.error('Asked for an unknown sha: ' + sha)
return
}
var directory = announcedRefs[sha]
var pack = spawn('git', ['pack-objects', '--revs', '--thin', '--stdout', '--delta-base-offset'], {cwd: directory})
pack.on('close', function (code) {
if (code !== 0) {
console.error('git pack-objects process exited with code ' + code)
} else {
console.error('Finished writing ' + filename)
var webtorrent = new WebTorrent({
dht: {bootstrap: config.dht.bootstrap},
tracker: false
})
webtorrent.seed(filename, function onTorrent (torrent) {
console.error(torrent.infoHash)
wire.ut_gittorrent.sendTorrent(torrent.infoHash)
})
}
})
pack.stdout.pipe(stream)
pack.stderr.on('data', function (data) {
console.error(data.toString())
})
pack.on('exit', function () {
console.log('exited')
})
pack.stdin.write(sha + '\n')
pack.stdin.write('--not\n\n')
})
}).listen(config.dht.announce)
})
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