git ssb

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var http = require('http')
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var os = require('os')
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var fs = require('fs')
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var path = require('path')
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var URL = require('url')
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var http = require('http')
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var https = require('https')
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var crypto = require('crypto')
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var Transform = require('stream').Transform
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var proc = require('child_process')
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function usage(code) {
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  console.error('Usage: ' + process.argv[0] + ' ' + process.argv[1] + '\n' +
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    '  [--help] [--verbose]\n' +
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    '  [--blobs-host <host>] [--blobs-port <port>]\n' +
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    '  [--registry-host <host>] [--registry-port <port>]\n' +
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    '  [--blobs-remote <remote_address>]\n' +
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    '  [--] [<cmd> <args...>]')
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  process.exit(code)
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}
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var ssbAppname = process.env.ssb_appname || 'ssb'
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var ssbPath = process.env.ssb_path || path.join(os.homedir(), '.' + ssbAppname)
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var blobsPath = path.join(ssbPath, 'blobs')
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var blobsTmpPath = path.join(blobsPath, 'tmp')
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var numTmpBlobs = 0
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var remotes = []
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function blobFilename(buf) {
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  var str = buf.toString('hex')
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  return path.join(blobsPath, 'sha256', str.slice(0, 2), str.slice(2))
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}
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function formatHttpAddr(addr) {
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  return 'http://' + (typeof addr === 'string' ? 'unix:' + addr
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    : addr.family === 'IPv6' ? '[' + addr.address + ']:' + addr.port
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    : addr.address + ':' + addr.port)
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}
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function serveBlobs(opts, req, res) {
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  var p = URL.parse(req.url)
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  if (p.pathname === '/') return serveStatus(res, 204)
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  var m = /^\/blobs\/get\/(&([A-Za-z0-9\/+]{43}=)\.sha256)$/.exec(p.pathname)
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  if (m) return serveBlobsGet(req, res, opts.remote, m[1], new Buffer(m[2], 'base64'))
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  return serveStatus(res, 404, 'Not Found')
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}
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function serveRegistry(opts, req, res) {
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  var p = URL.parse(req.url)
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  var pathname = req.url.replace(/\?.*/, '')
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  if (pathname === '/') return serveStatus(res, 204)
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  if (pathname === '/-/ping') return serveStatus(res, 200, null, '"pong"')
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  if (/^\/-\//.test(pathname)) return serveStatus(404)
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  return servePkg(opts.pkgs, req, res, pathname.substr(1))
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}
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function serveStatus(res, code, message, body) {
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  res.writeHead(code, message)
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  res.end(body || message)
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}
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function serveStop(opts, req, res) {
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  var addr = req.socket.remoteAddress
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  if (addr !== '::1' && addr !== '127.0.0.1' && addr !== '::ffff:127.0.0.1') {
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    return serveStatus(res, 403)
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  }
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  serveStatus(res, 200)
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  opts.registryServer.close()
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  opts.blobsServer.close()
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}
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function serveBlobsGet(req, res, remote, id, hash) {
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  var filename = blobFilename(hash)
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  getAddBlob(remote, id, hash, filename, function (err, stream) {
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    if (err) return serveStatus(res, 500, null, err.message)
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    if (!stream) return serveStatus(res, 404, 'Blob Not Found')
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    res.writeHead(200)
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    stream.pipe(res)
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  })
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}
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function getAddBlob(remote, id, hash, filename, cb) {
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  fs.access(filename, fs.constants.R_OK, function (err) {
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    if (err && err.code === 'ENOENT') {
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      return fetchAddBlob(remote, id, hash, filename, cb)
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    }
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    if (err) return cb(err)
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    cb(null, fs.createReadStream(filename))
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  })
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}
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function getRemoteBlob(remote, id, cb) {
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  if (/^https:\/\//.test(remote)) return https.get(remote + id, cb)
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  if (/^http:\/\//.test(remote)) return https.get(remote + id, cb)
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  return http.get('http://' + remote + '/blobs/get/' + id, cb)
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}
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function mkdirp(dir, cb) {
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  fs.stat(dir, function (err, stats) {
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    if (!err) return cb()
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    fs.mkdir(dir, function (err) {
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      if (!err) return cb()
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      mkdirp(path.dirname(dir), function (err) {
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        if (err) return cb(err)
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        fs.mkdir(dir, cb)
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      })
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    })
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  })
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}
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function rename(src, dest, cb) {
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  mkdirp(path.dirname(dest), function (err) {
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    if (err) return cb(err)
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    fs.rename(src, dest, cb)
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  })
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}
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function fetchAddBlob(remote, id, hash, filename, cb) {
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  var req = getRemoteBlob(remote, id, function (res) {
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    req.removeListener('error', cb)
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    if (res.statusCode !== 200) return cb(new Error(res.statusMessage))
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    mkdirp(blobsTmpPath, function (err) {
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      if (err) return res.destroy(), cb(err)
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      var blobTmpPath = path.join(blobsTmpPath, Date.now() + '-' + numTmpBlobs++)
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      fs.open(blobTmpPath, 'w+', function (err, fd) {
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        if (err) return res.destroy(), cb(err)
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        var writeStream = fs.createWriteStream(null, {
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          fd: fd, flags: 'w+', autoClose: false})
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        var hasher = crypto.createHash('sha256')
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        var hashThrough = new Transform({
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          transform: function (data, encoding, cb) {
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            hasher.update(data)
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            cb(null, data)
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          }
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        })
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        res.pipe(hashThrough).pipe(writeStream, {end: false})
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        res.on('error', function (err) {
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          writeStream.end(function (err1) {
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            fs.unlink(blobTmpPath, function (err2) {
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              cb(err || err1 || err2)
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            })
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          })
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        })
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        hashThrough.on('end', function () {
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          var receivedHash = hasher.digest()
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          if (hash.compare(receivedHash)) {
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            writeStream.end(function (err) {
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              fs.unlink(blobTmpPath, function (err1) {
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                cb(err || err1)
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              })
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            })
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          } else {
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            res.unpipe(hashThrough)
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            rename(blobTmpPath, filename, function (err) {
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              if (err) return console.error(err)
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              cb(null, fs.createReadStream(null, {fd: fd, start: 0}))
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            })
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          }
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        })
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      })
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    })
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  })
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  req.on('error', cb)
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}
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function servePkg(pkgs, req, res, pathname) {
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  var self = this
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  var parts = pathname.split('/')
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  var pkgName = parts.shift()
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  if (parts[0] === '-rev') return serveStatus(res, 501, 'Unpublish is not supported')
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  if (parts.length > 0) return serveStatus(res, 404)
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  var pkg = pkgs[pkgName] || {}
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  serveStatus(res, 200, null, JSON.stringify(pkg, 0, 2))
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}
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function startServers(opts, cb) {
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  var waiting = 2
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  opts.blobsServer = http.createServer(serveBlobs.bind(null, opts))
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  .listen(opts.blobsPort, opts.blobsHost, function () {
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    if (opts.verbose) console.error('blobs listening on ' + formatHttpAddr(this.address()))
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    if (!--waiting) cb()
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  })
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  opts.registryServer = http.createServer(serveRegistry.bind(null, opts))
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  .listen(opts.registryPort, opts.registryHost, function () {
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    if (opts.verbose) console.error('registry listening on ' + formatHttpAddr(this.address()))
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    if (!--waiting) cb()
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  })
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}
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process.nextTick(function () {
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  var args = process.argv.slice(2)
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  var opts = {
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    pkgs: exports.pkgs || {},
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    blobsPort: 8989,
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    registryPort: 8043,
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  }
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  var cmd
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  getopts: while (args.length) {
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    var arg = args.shift()
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    switch (arg) {
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      case '--help': return usage(0)
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      case '--verbose': opts.verbose = true; break
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      case '--blobs-host': opts.blobsHost = args.shift(); break
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      case '--blobs-port': opts.blobsPort = args.shift(); break
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      case '--registry-port': opts.registryPort = args.shift(); break
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      case '--registry-host': opts.registryHost = args.shift(); break
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      case '--blobs-remote': opts.remote = args.shift(); break
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      case '--': cmd = args.shift(); break getopts
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      default: if (/^--/.test(arg)) return usage(1); cmd = arg; break getopts
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    }
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  }
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  startServers(opts, function (err) {
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    if (err) throw err
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    if (cmd) {
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      var regHost = opts.registryHost || 'localhost'
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      var regHostname = regHost + ':' + opts.registryPort
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      if (cmd === 'npm' || cmd === 'npx') {
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        args.unshift('--registry=http://' + regHostname + '/')
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        args.unshift('--//' + regHostname + '/:_authToken=1')
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        args.unshift('--download=http://' + regHostname + '/-/prebuild/{name}-v{version}-{runtime}-v{abi}-{platform}{libc}-{arch}.tar.gz')
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      }
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      var child = proc.spawn(cmd, args, {
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        stdio: 'inherit'
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      })
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      child.on('exit', process.exit)
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      process.on('SIGINT', function () { child.kill('SIGINT') })
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      process.on('SIGTERM', function () { child.kill('SIGTERM') })
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      process.on('uncaughtException', function (e) {
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        console.error(e)
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        child.kill('SIGKILL')
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        process.exit(1)
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      })
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    }
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  })
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})
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