git ssb

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var http = require('http')
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var memo = require('asyncmemo')
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var lru = require('hashlru')
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var pkg = require('../package')
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var u = require('./util')
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var pull = require('pull-stream')
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var multicb = require('multicb')
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var paramap = require('pull-paramap')
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var Contacts = require('ssb-contact')
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var About = require('./about')
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var Serve = require('./serve')
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var Render = require('./render')
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var Git = require('./git')
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var cat = require('pull-cat')
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var proc = require('child_process')
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var toPull = require('stream-to-pull-stream')
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var BoxStream = require('pull-box-stream')
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var crypto = require('crypto')
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var zeros = new Buffer(24); zeros.fill(0)
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module.exports = App
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function App(sbot, config) {
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  this.sbot = sbot
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  this.config = config
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  var conf = config.patchfoo || {}
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  this.port = conf.port || 8027
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  this.host = conf.host || 'localhost'
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  this.msgFilter = conf.filter
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  var base = conf.base || '/'
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  this.opts = {
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    base: base,
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    blob_base: conf.blob_base || conf.img_base || base,
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    img_base: conf.img_base || base,
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    emoji_base: conf.emoji_base || (base + 'emoji/'),
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    encode_msgids: conf.encode_msgids == null ? true : Boolean(conf.encode_msgids),
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  }
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  sbot.get = memo({cache: lru(100)}, sbot.get)
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  this.about = new About(this, sbot.id)
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  this.getMsg = memo({cache: lru(100)}, getMsgWithValue, sbot)
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  this.getAbout = memo({cache: this.aboutCache = lru(500)},
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    this._getAbout.bind(this))
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  this.unboxContent = memo({cache: lru(100)}, sbot.private.unbox)
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  this.reverseNameCache = lru(500)
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  this.reverseEmojiNameCache = lru(500)
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  this.getBlobSize = memo({cache: this.blobSizeCache = lru(100)},
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    sbot.blobs.size.bind(sbot.blobs))
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  this.getFollows = memo(this._getFollows.bind(this))
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  this.getVotes = memo({cache: lru(100)}, this._getVotes.bind(this))
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  this.unboxMsg = this.unboxMsg.bind(this)
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  this.render = new Render(this, this.opts)
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  this.git = new Git(this)
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  this.monitorBlobWants()
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}
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App.prototype.go = function () {
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  var self = this
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  var server = http.createServer(function (req, res) {
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    new Serve(self, req, res).go()
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  })
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  if (self.host === 'localhost') server.listen(self.port, onListening)
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  else server.listen(self.port, self.host, onListening)
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  function onListening() {
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    var host = /:/.test(self.host) ? '[' + self.host + ']' : self.host
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    self.log('Listening on http://' + host + ':' + self.port)
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  }
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  // invalidate cached About info when new About messages come in
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  pull(
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    self.sbot.links({rel: 'about', old: false, values: true}),
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    pull.drain(function (link) {
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      self.aboutCache.remove(link.dest)
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    }, function (err) {
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      if (err) throw err
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    })
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  )
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  // keep alive ssb client connection
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  setInterval(self.sbot.whoami, 10e3)
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}
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var logPrefix = '[' + pkg.name + ']'
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App.prototype.log = console.log.bind(console, logPrefix)
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App.prototype.error = console.error.bind(console, logPrefix)
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App.prototype.unboxMsg = function (msg, cb) {
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  var self = this
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  var c = msg.value && msg.value.content
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  if (typeof c !== 'string') cb(null, msg)
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  else self.unboxContent(c, function (err, content) {
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    if (err) {
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      self.error('unbox:', err)
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      return cb(null, msg)
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    } else if (!content) {
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      return cb(null, msg)
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    }
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    var m = {}
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    for (var k in msg) m[k] = msg[k]
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    m.value = {}
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    for (var k in msg.value) m.value[k] = msg.value[k]
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    m.value.content = content
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    m.value.private = true
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    cb(null, m)
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  })
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}
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App.prototype.search = function (opts) {
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  var search = this.sbot.fulltext && this.sbot.fulltext.search
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  if (!search) return pull.error(new Error('Missing fulltext search plugin'))
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  return search(opts)
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}
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App.prototype.advancedSearch = function (opts) {
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  return pull(
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    opts.channel ?
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      this.sbot.backlinks.read({
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        dest: '#' + opts.channel,
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        reverse: true,
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      })
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    : opts.dest ?
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      this.sbot.links({
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        values: true,
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        dest: opts.dest,
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        source: opts.source || undefined,
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        reverse: true,
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      })
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    : opts.source ?
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      this.sbot.createUserStream({
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        reverse: true,
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        id: opts.source
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      })
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    :
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      this.sbot.createFeedStream({
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        reverse: true,
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      }),
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    opts.text && pull.filter(filterByText(opts.text))
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  )
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}
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function forSome(each) {
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  return function some(obj) {
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    if (obj == null) return false
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    if (typeof obj === 'string') return each(obj)
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    if (Array.isArray(obj)) return obj.some(some)
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    if (typeof obj === 'object')
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      for (var k in obj) if (some(obj[k])) return true
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    return false
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  }
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}
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function filterByText(str) {
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  if (!str) return function () { return true }
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  var search = new RegExp(str, 'i')
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  var matches = forSome(search.test.bind(search))
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  return function (msg) {
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    var c = msg.value.content
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    return c && matches(c)
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  }
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}
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App.prototype.getMsgDecrypted = function (key, cb) {
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  var self = this
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  this.getMsg(key, function (err, msg) {
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    if (err) return cb(err)
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    self.unboxMsg(msg, cb)
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  })
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}
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App.prototype.publish = function (content, cb) {
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  var self = this
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  function tryPublish(triesLeft) {
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    if (Array.isArray(content.recps)) {
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      recps = content.recps.map(u.linkDest)
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      self.sbot.private.publish(content, recps, next)
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    } else {
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      self.sbot.publish(content, next)
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    }
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    function next(err, msg) {
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      if (err) {
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        if (triesLeft > 0) {
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          if (/^expected previous:/.test(err.message)) {
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            return tryPublish(triesLeft-1)
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          }
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        }
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      }
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      return cb(err, msg)
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    }
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  }
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  tryPublish(2)
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}
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App.prototype.wantSizeBlob = function (id, cb) {
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  // only want() the blob if we don't already have it
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  var self = this
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  var blobs = this.sbot.blobs
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  blobs.size(id, function (err, size) {
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    if (size != null) return cb(null, size)
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    self.blobWants[id] = true
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    blobs.want(id, function (err) {
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      if (err) return cb(err)
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      blobs.size(id, cb)
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    })
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  })
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}
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App.prototype.addBlobRaw = function (cb) {
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  var done = multicb({pluck: 1, spread: true})
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  var sink = pull(
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    u.pullLength(done()),
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    this.sbot.blobs.add(done())
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  )
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  done(function (err, size, hash) {
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    if (err) return cb(err)
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    cb(null, {link: hash, size: size})
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  })
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  return sink
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}
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App.prototype.addBlob = function (isPrivate, cb) {
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  if (!isPrivate) return this.addBlobRaw(cb)
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  else return this.addBlobPrivate(cb)
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}
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App.prototype.addBlobPrivate = function (cb) {
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  var bufs = []
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  var self = this
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  // use the hash of the cleartext as the key to encrypt the blob
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  var hash = crypto.createHash('sha256')
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  return pull.drain(function (buf) {
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    bufs.push(buf)
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    hash.update(buf)
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  }, function (err) {
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    if (err) return cb(err)
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    var secret = hash.digest()
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    pull(
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      pull.values(bufs),
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      BoxStream.createBoxStream(secret, zeros),
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      self.addBlobRaw(function (err, link) {
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        if (err) return cb(err)
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        link.key = secret.toString('base64')
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        cb(null, link)
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      })
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    )
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  })
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}
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App.prototype.getBlob = function (id, key) {
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  if (!key) return this.sbot.blobs.get(id)
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  if (typeof key === 'string') key = new Buffer(key, 'base64')
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  return pull(
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    this.sbot.blobs.get(id),
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    BoxStream.createUnboxStream(key, zeros)
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  )
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}
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App.prototype.pushBlob = function (id, cb) {
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  console.error('pushing blob', id)
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  this.sbot.blobs.push(id, cb)
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}
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App.prototype.readBlob = function (link) {
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  link = u.toLink(link)
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  return this.sbot.blobs.get({
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    hash: link.link,
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    size: link.size,
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  })
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}
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App.prototype.readBlobSlice = function (link, opts) {
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  if (this.sbot.blobs.getSlice) return this.sbot.blobs.getSlice({
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    hash: link.link,
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    size: link.size,
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    start: opts.start,
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    end: opts.end,
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  })
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  return pull(
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    this.readBlob(link),
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    u.pullSlice(opts.start, opts.end)
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  )
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}
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App.prototype.ensureHasBlobs = function (links, cb) {
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  var self = this
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  var done = multicb({pluck: 1})
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  links.forEach(function (link) {
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    var cb = done()
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    self.sbot.blobs.size(link.link, function (err, size) {
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      if (err) cb(err)
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      else if (size == null) cb(null, link)
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      else cb()
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    })
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  })
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  done(function (err, missingLinks) {
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    if (err) console.trace(err)
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    missingLinks = missingLinks.filter(Boolean)
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    if (missingLinks.length == 0) return cb()
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    return cb({name: 'BlobNotFoundError', links: missingLinks})
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  })
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}
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App.prototype.getReverseNameSync = function (name) {
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  var id = this.reverseNameCache.get(name)
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  return id
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}
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App.prototype.getReverseEmojiNameSync = function (name) {
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  return this.reverseEmojiNameCache.get(name)
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}
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App.prototype.getNameSync = function (name) {
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  var about = this.aboutCache.get(name)
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  return about && about.name
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}
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function getMsgWithValue(sbot, id, cb) {
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  if (!id) return cb()
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  sbot.get(id, function (err, value) {
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    if (err) return cb(err)
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    cb(null, {key: id, value: value})
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  })
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}
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App.prototype._getAbout = function (id, cb) {
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  var self = this
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  if (!u.isRef(id)) return cb(null, {})
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  self.about.get(id, function (err, about) {
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    if (err) return cb(err)
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    var sigil = id[0] || '@'
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    if (about.name && about.name[0] !== sigil) {
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      about.name = sigil + about.name
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    }
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    self.reverseNameCache.set(about.name, id)
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    cb(null, about)
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  })
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}
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App.prototype.pullGetMsg = function (id) {
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  return pull.asyncMap(this.getMsg)(pull.once(id))
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}
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App.prototype.createLogStream = function (opts) {
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  opts = opts || {}
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  return opts.sortByTimestamp
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    ? this.createFeedStream(opts)
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    : this.sbot.createLogStream(opts)
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}
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App.prototype.createFeedStream = function (opts) {
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  // work around opts.gt being treated as opts.gte sometimes
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  if (opts.gt && opts.limit && !opts.reverse) return pull(
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    this.sbot.createFeedStream(u.mergeOpts(opts, {limit: opts.limit + 1})),
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    pull.filter(function (msg) {
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      return msg && msg.value.timestamp !== opts.gt
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    }),
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    opts.limit && pull.take(opts.limit)
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  )
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  return this.sbot.createFeedStream(opts)
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}
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var stateVals = {
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  connected: 3,
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  connecting: 2,
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  disconnecting: 1,
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}
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function comparePeers(a, b) {
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  var aState = stateVals[a.state] || 0
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  var bState = stateVals[b.state] || 0
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  return (bState - aState)
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    || (b.stateChange|0 - a.stateChange|0)
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}
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App.prototype.streamPeers = function (opts) {
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  var gossip = this.sbot.gossip
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  return u.readNext(function (cb) {
383
    gossip.peers(function (err, peers) {
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      if (err) return cb(err)
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      if (opts) peers = peers.filter(function (peer) {
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        for (var k in opts) if (opts[k] !== peer[k]) return false
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        return true
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      })
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      peers.sort(comparePeers)
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      cb(null, pull.values(peers))
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    })
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  })
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}
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App.prototype.getFollow = function (source, dest, cb) {
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  var self = this
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  pull(
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    self.sbot.links({source: source, dest: dest, rel: 'contact', reverse: true,
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      values: true, meta: false, keys: false}),
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    pull.filter(function (value) {
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      var c = value && value.content
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      return c && c.type === 'contact'
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    }),
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    pull.take(1),
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    pull.collect(function (err, msgs) {
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      if (err) return cb(err)
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      cb(null, msgs[0] && !!msgs[0].content.following)
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    })
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  )
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}
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App.prototype.unboxMessages = function () {
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  return paramap(this.unboxMsg, 16)
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}
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App.prototype.streamChannels = function (opts) {
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  return pull(
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    this.sbot.messagesByType({type: 'channel', reverse: true}),
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    this.unboxMessages(),
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    pull.filter(function (msg) {
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      return msg.value.content.subscribed
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    }),
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    pull.map(function (msg) {
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      return msg.value.content.channel
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    }),
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    pull.unique()
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  )
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}
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App.prototype.streamMyChannels = function (id, opts) {
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  // use ssb-query plugin if it is available, since it has an index for
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  // author + type
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  if (this.sbot.query) return pull(
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    this.sbot.query.read({
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      reverse: true,
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      query: [
437
        {$filter: {
438
          value: {
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            author: id,
440
            content: {type: 'channel', subscribed: true}
441
          }
442
        }},
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        {$map: ['value', 'content', 'channel']}
444
      ]
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    }),
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    pull.unique()
447
  )
448
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  return pull(
450
    this.sbot.createUserStream({id: id, reverse: true}),
451
    this.unboxMessages(),
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    pull.filter(function (msg) {
453
      if (msg.value.content.type == 'channel') {
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        return msg.value.content.subscribed
455
      }
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    }),
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    pull.map(function (msg) {
458
      return msg.value.content.channel
459
    }),
460
    pull.unique()
461
  )
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}
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App.prototype.createContactStreams = function (id) {
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  return new Contacts(this.sbot).createContactStreams(id)
466
}
467
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function compareVoted(a, b) {
469
  return b.value - a.value
470
}
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App.prototype.getVoted = function (_opts, cb) {
473
  if (isNaN(_opts.limit)) return pull.error(new Error('missing limit'))
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  var self = this
475
  var opts = {
476
    type: 'vote',
477
    limit: _opts.limit * 100,
478
    reverse: !!_opts.reverse,
479
    gt: _opts.gt || undefined,
480
    lt: _opts.lt || undefined,
481
  }
482
483
  var votedObj = {}
484
  var votedArray = []
485
  var numItems = 0
486
  var firstTimestamp, lastTimestamp
487
  pull(
488
    self.sbot.messagesByType(opts),
489
    self.unboxMessages(),
490
    pull.take(function () {
491
      return numItems < _opts.limit
492
    }),
493
    pull.drain(function (msg) {
494
      if (!firstTimestamp) firstTimestamp = msg.timestamp
495
      lastTimestamp = msg.timestamp
496
      var vote = msg.value.content.vote
497
      if (!vote) return
498
      var target = u.linkDest(vote)
499
      var votes = votedObj[target]
500
      if (!votes) {
501
        numItems++
502
        votes = {id: target, value: 0, feedsObj: {}, feeds: []}
503
        votedObj[target] = votes
504
        votedArray.push(votes)
505
      }
506
      if (msg.value.author in votes.feedsObj) {
507
        if (!opts.reverse) return // leave latest vote value as-is
508
        // remove old vote value
509
        votes.value -= votes.feedsObj[msg.value.author]
510
      } else {
511
        votes.feeds.push(msg.value.author)
512
      }
513
      var value = vote.value > 0 ? 1 : vote.value < 0 ? -1 : 0
514
      votes.feedsObj[msg.value.author] = value
515
      votes.value += value
516
    }, function (err) {
517
      if (err && err !== true) return cb(err)
518
      var items = votedArray
519
      if (opts.reverse) items.reverse()
520
      items.sort(compareVoted)
521
      cb(null, {items: items,
522
        firstTimestamp: firstTimestamp,
523
        lastTimestamp: lastTimestamp})
524
    })
525
  )
526
}
527
528
App.prototype.createAboutStreams = function (id) {
529
  return this.about.createAboutStreams(id)
530
}
531
532
App.prototype.streamEmojis = function () {
533
  return pull(
534
    cat([
535
      this.sbot.links({
536
        rel: 'mentions',
537
        source: this.sbot.id,
538
        dest: '&',
539
        values: true
540
      }),
541
      this.sbot.links({rel: 'mentions', dest: '&', values: true})
542
    ]),
543
    this.unboxMessages(),
544
    pull.map(function (msg) { return msg.value.content.mentions }),
545
    pull.flatten(),
546
    pull.filter('emoji'),
547
    pull.unique('link')
548
  )
549
}
550
551
App.prototype.filter = function (plugin, opts, filter) {
552
  // work around flumeview-query not picking the best index.
553
  // %b+QdyLFQ21UGYwvV3AiD8FEr7mKlB8w9xx3h8WzSUb0=.sha256
554
  var index
555
  if (plugin === this.sbot.backlinks) {
556
    var c = filter && filter.value && filter.value.content
557
    var filteringByType = c && c.type
558
    if (!filteringByType) index = 'DTS'
559
  }
560
  // work around flumeview-query not supporting $lt/$gt.
561
  // %FCIv0D7JQyERznC18p8Dc1KtN6SLeJAl1sR5DAIr/Ek=.sha256
562
  return pull(
563
    plugin.read({
564
      index: index,
565
      reverse: opts.reverse,
566
      limit: opts.limit && (opts.limit + 1),
567
      query: [{$filter: u.mergeOpts(filter, {
568
        timestamp: {
569
          $gte: opts.gt,
570
          $lte: opts.lt,
571
        }
572
      })}]
573
    }),
574
    pull.filter(function (msg) {
575
      return msg && msg.timestamp !== opts.lt && msg.timestamp !== opts.gt
576
    }),
577
    opts.limit && pull.take(opts.limit)
578
  )
579
}
580
581
App.prototype.streamChannel = function (opts) {
582
  // prefer ssb-backlinks to ssb-query because it also handles hashtag mentions
583
  if (this.sbot.backlinks) return this.filter(this.sbot.backlinks, opts, {
584
    dest: '#' + opts.channel,
585
  })
586
587
  if (this.sbot.query) return this.filter(this.sbot.query, opts, {
588
    value: {content: {channel: opts.channel}},
589
  })
590
591
  return pull.error(new Error(
592
    'Viewing channels/tags requires the ssb-backlinks or ssb-query plugin'))
593
}
594
595
App.prototype.streamMentions = function (opts) {
596
  if (!this.sbot.backlinks) return pull.error(new Error(
597
    'Viewing mentions requires the ssb-backlinks plugin'))
598
599
  if (this.sbot.backlinks) return this.filter(this.sbot.backlinks, opts, {
600
    dest: this.sbot.id,
601
  })
602
}
603
604
App.prototype.streamPrivate = function (opts) {
605
  if (this.sbot.private.read) return this.filter(this.sbot.private, opts, {})
606
607
  return pull(
608
    this.createLogStream(u.mergeOpts(opts)),
609
    pull.filter(u.isMsgEncrypted),
610
    this.unboxMessages(),
611
    pull.filter(u.isMsgReadable)
612
  )
613
}
614
615
App.prototype.blobMentions = function (opts) {
616
  if (!this.sbot.links2) return pull.error(new Error(
617
    'missing ssb-links plugin'))
618
  var filter = {rel: ['mentions', opts.name]}
619
  if (opts.author) filter.source = opts.author
620
  return this.sbot.links2.read({
621
    query: [
622
      {$filter: filter},
623
      {$filter: {dest: {$prefix: '&'}}},
624
      {$map: {
625
        name: ['rel', 1],
626
        size: ['rel', 2],
627
        link: 'dest',
628
        author: 'source',
629
        time: 'ts'
630
      }}
631
    ]
632
  })
633
}
634
635
App.prototype.monitorBlobWants = function () {
636
  var self = this
637
  self.blobWants = {}
638
  pull(
639
    this.sbot.blobs.createWants(),
640
    pull.drain(function (wants) {
641
      for (var id in wants) {
642
        if (wants[id] < 0) self.blobWants[id] = true
643
        else delete self.blobWants[id]
644
        self.blobSizeCache.remove(id)
645
      }
646
    }, function (err) {
647
      if (err) console.trace(err)
648
    })
649
  )
650
}
651
652
App.prototype.getBlobState = function (id, cb) {
653
  var self = this
654
  if (self.blobWants[id]) return cb(null, 'wanted')
655
  self.getBlobSize(id, function (err, size) {
656
    if (err) return cb(err)
657
    cb(null, size != null)
658
  })
659
}
660
661
App.prototype.getNpmReadme = function (tarballId, cb) {
662
  var self = this
663
  // TODO: make this portable, and handle plaintext readmes
664
  var tar = proc.spawn('tar', ['--ignore-case', '-Oxz',
665
    'package/README.md', 'package/readme.markdown', 'package/readme.mkd'])
666
  var done = multicb({pluck: 1, spread: true})
667
  pull(
668
    self.sbot.blobs.get(tarballId),
669
    toPull.sink(tar.stdin, done())
670
  )
671
  pull(
672
    toPull.source(tar.stdout),
673
    pull.collect(done())
674
  )
675
  done(function (err, _, bufs) {
676
    if (err) return cb(err)
677
    var text = Buffer.concat(bufs).toString('utf8')
678
    cb(null, text, true)
679
  })
680
}
681
682
App.prototype.filterMsg = function (msg, opts, cb) {
683
  var self = this
684
  var myId = self.sbot.id
685
  var author = msg.value && msg.value.author
686
  var filter = opts.filter || self.msgFilter
687
  var show = (filter !== 'invert')
688
  if (filter === 'all'
689
   || author === myId
690
   || author === opts.feed
691
   || msg.key === opts.msgId) return cb(null, show)
692
  self.getFollows(myId, function (err, follows) {
693
    if (err) return cb(err)
694
    if (follows[author]) return cb(null, show)
695
    self.getVotes(msg.key, function (err, votes) {
696
      if (err) return cb(err)
697
      for (var author in votes) {
698
        if (follows[author] && votes[author] > 0) {
699
          return cb(null, show)
700
        }
701
      }
702
      return cb(null, !show)
703
    })
704
  })
705
}
706
707
App.prototype.isFollowing = function (src, dest, cb) {
708
  var self = this
709
  self.getFollows(src, function (err, follows) {
710
    if (err) return cb(err)
711
    return cb(null, follows[dest])
712
  })
713
}
714
715
App.prototype._getFollows = function (id, cb) {
716
  var follows = {}
717
  function ready(err) {
718
    if (!cb) return
719
    var _cb = cb
720
    cb = null
721
    _cb(err, follows)
722
  }
723
  pull(
724
    this.sbot.links2.read({
725
      live: true,
726
      query: [
727
        {$filter: {
728
          source: id,
729
          rel: [{$prefix: 'contact'}]
730
        }},
731
        {$map: {
732
          following: ['rel', 1],
733
          feed: 'dest'
734
        }}
735
      ]
736
    }),
737
    pull.drain(function (link) {
738
      if (link.sync) return ready()
739
      follows[link.feed] = link.following
740
    }, ready)
741
  )
742
}
743
744
App.prototype._getVotes = function (id, cb) {
745
  var votes = {}
746
  pull(
747
    this.sbot.links2.read({
748
      query: [
749
        {$filter: {
750
          dest: id,
751
          rel: [{$prefix: 'vote'}]
752
        }},
753
        {$map: {
754
          value: ['rel', 1],
755
          author: 'source'
756
        }}
757
      ]
758
    }),
759
    pull.drain(function (vote) {
760
      votes[vote.author] = vote.value
761
    }, function (err) {
762
      cb(err, votes)
763
    })
764
  )
765
}
766