git ssb

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#!/usr/bin/env node
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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 readline = require('readline')
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var os = require('os')
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var ssbClient = require('ssb-client')
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var pull = require('pull-stream')
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var pkg = require('./package')
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var userAgentBase = pkg.name + '/' + pkg.version
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var userAgentContact
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var userAgentBot = false
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function estimateMessageSize(content) {
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  var draftMsg = {
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    key: '%0000000000000000000000000000000000000000000=.sha256',
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    value: {
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      previous: '%0000000000000000000000000000000000000000000=.sha256',
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      author: '@0000000000000000000000000000000000000000000=.ed25519',
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      sequence: 100000,
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      timestamp: 1000000000000.0001,
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      hash: 'sha256',
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      content: content,
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      signature: '00000000000000000000000000000000000000000000000000000000000000000000000000000000000000==.sig.ed25519'
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    }
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  }
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  return JSON.stringify(draftMsg, null, 2).length
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}
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function mapCollect(fn) {
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  var aborted
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  return function (read) {
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    var queue = []
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    return function (abort, cb) {
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      if (aborted = abort) return read(abort, cb)
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      read(null, function next(end, data) {
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        if (end) return cb(end)
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        queue.push(data)
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        var result = fn(queue)
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        if (result) read(null, next)
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      })
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    }
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  }
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}
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function getJson(url, cb) {
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  var opts = URL.parse(url)
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  opts.headers = {
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    'User-Agent': userAgentBase
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      + (userAgentContact ? ' (' + userAgentContact + ')' : '')
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      + (userAgentBot ? ' bot' : '')
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  }
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  var h = opts.protocol === 'https:' ? https : http
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  h.get(opts, function (res) {
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    if (res.statusCode !== 200) return cb(new Error('HTTP ' + res.statusCode + ' ' + res.statusMessage))
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    var bufs = []
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    res.on('data', function (buf) {
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      bufs.push(buf)
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    })
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    res.on('end', function () {
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      res.removeListener('error', cb)
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      var buf = Buffer.concat(bufs)
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      bufs = null
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      var data
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      try {
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        data = JSON.parse(buf.toString('utf8'))
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      } catch(e) {
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        return cb(e)
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      }
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      cb(null, data)
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    })
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    res.on('error', cb)
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  })
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}
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function publishDrafts(sbot, drafts, cb) {
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  var draftIdIndex = {}
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  drafts.forEach(function (draft, i) {
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    draftIdIndex[draft.draftId] = i
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  })
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  var ids = []
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  function replaceDraftIds(obj) {
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    if (typeof obj === 'string') {
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      var i = draftIdIndex[obj]
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      if (typeof i === 'number') {
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        var id = ids[i]
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        if (!id) throw new ReferenceError('draft referernces unknown message')
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        return id
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      }
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    } else if (Array.isArray(obj)) {
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      return obj.map(replaceDraftIds)
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    } else if (obj !== null && typeof obj === 'object') {
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      var o = {}
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      for (var k in obj) o[k] = replaceDraftIds(obj[k])
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      return o
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    }
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    return obj
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  }
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  pull(
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    pull.values(drafts),
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    pull.asyncMap(function (draft, cb) {
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      var content = replaceDraftIds(draft.content)
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      sbot.publish(content, function (err, msg) {
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        if (err) return cb(err)
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        ids.push(msg.key)
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        cb(null, msg)
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      })
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    }),
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    pull.collect(cb)
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  )
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}
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var args = process.argv.slice(2)
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var yes = false
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var dry = false
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var help = false
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var urls = []
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args.forEach(function (arg) {
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  if (arg[0] === '-') switch (arg) {
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    case '-n': return dry = true
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    case '-y': return yes = true
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    case '-h': return help = true
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    default: throw 'Unknown argument: ' + arg
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  } else urls.push(arg)
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})
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if (help) {
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  process.stdout.write(fs.readFileSync(path.join(__dirname, 'usage.txt')))
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  process.exit(0)
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}
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ssbClient(function (err, sbot, config) {
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  if (err) throw err
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  var conf = config.wikimedia || {}
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  userAgentContact = conf.contact
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  userAgentBot = conf.bot
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  if (urls.length === 0) {
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    var pagesFile = path.join(config.path, 'wikimedia-pages.txt')
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    var pagesData = fs.readFileSync(pagesFile, 'utf8')
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    urls = pagesData.split('\n').filter(RegExp.prototype.test.bind(/[^#]/))
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    if (!urls.length) {
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      console.log('No pages to sync.')
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      return sbot.close()
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    }
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  }
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  var pagesInfo = urls.map(function (page) {
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    var m = /^(.*?)\/wiki\/(.*)$/.exec(page)
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    if (!m) throw 'Unable to parse page URL ' + page
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    return {
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      site: m[1] + '/',
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      api: m[1] + '/w/api.php',
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      title: m[2]
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    }
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  })
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  var pagesInfoByApi = {}
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  pagesInfo.forEach(function (pageInfo) {
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    var infos = pagesInfoByApi[pageInfo.api] || (pagesInfoByApi[pageInfo.api] = [])
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    infos.push(pageInfo)
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  })
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  console.log('Normalizing titles...')
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  var waiting = 0
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  for (var api in pagesInfoByApi) (function (api) {
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    var pagesInfoForApi = pagesInfoByApi[api]
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    var pagesInfoForApiByTitle = {}
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    var titles = pagesInfoForApi.map(function (info) {
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      pagesInfoForApiByTitle[info.title] = info
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      return info.title
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    })
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    var url = api + '?format=json&action=query' +
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      '&titles=' + encodeURIComponent('\x1f' + titles.join('\x1f'))
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    waiting++
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    getJson(url, function (err, data) {
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      if (err) throw err
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      if (data.warnings) console.trace('Warnings:', data.warnings)
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      if (data.query.normalized) data.query.normalized.forEach(function (norm) {
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        var info = pagesInfoForApiByTitle[norm.from]
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        if (!info) {
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          console.error(JSON.stringify({titles: titles, response: data}, 0, 2))
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          throw new Error('Unexpected title in server response')
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        }
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        // console.log('Normalized title', norm.from, norm.to)
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        info.title = norm.to
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      })
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      if (!--waiting) next()
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    })
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  }(api))
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  function next() {
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    console.log('Getting revisions...')
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    pull(
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      pull.values(pagesInfo),
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      pull.asyncMap(function (pageInfo, cb) {
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        // Calculate blob id for page URL + title, for linking
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        pull(
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          pull.once(pageInfo.site + '\t' + pageInfo.title),
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          sbot.blobs.add(function (err, hash) {
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            pageInfo.hash = hash
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            cb(null, pageInfo)
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          })
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        )
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      }),
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      pull.asyncMap(function (pageInfo, cb) {
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        // Get previous messages for this page.
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        // Simple solution: find the revision with latest timestamp.
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        var maxRevTs = ''
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        var maxRevMsgId
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        pull(
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          sbot.links({
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            dest: pageInfo.hash,
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            rel: 'pageId',
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            values: true,
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            meta: false
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          }),
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          pull.filter(function (msg) {
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            var c = msg && msg.value && msg.value.content
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            return c
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              && c.type === 'wikimedia/revisions'
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              && c.site === pageInfo.site
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              && c.title === pageInfo.title
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          }),
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          pull.drain(function (msg) {
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            var c = msg && msg.value && msg.value.content
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            var revs = Array.isArray(c.revisions) && c.revisions
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            if (revs) revs.forEach(function (rev) {
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              if (rev && rev.timestamp > maxRevTs) {
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                maxRevTs = rev.timestamp
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                maxRevMsgId == msg.key
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              }
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            })
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          }, function (err) {
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            if (err) return cb(err)
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            pageInfo.latestMsgId = maxRevMsgId
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            pageInfo.latestRevTs = maxRevTs
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            cb(null, pageInfo)
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          })
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        )
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      }),
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      pull.map(function (pageInfo) {
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        // Get new revisions.
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        var rvcontinue, rvdone
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        var rvstart = pageInfo.latestRevTs
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        var prevId = pageInfo.latestMsgId
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        var aborted
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        var revisions = pull(
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          function (abort, cb) {
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            if (aborted = abort) return cb(abort)
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            if (rvdone) return cb(true)
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            console.log('Getting revisions for', pageInfo.title + '...',
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              rvstart || '', rvcontinue || '')
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            var url = api + '?format=json&action=query&prop=revisions&rvslots=*'
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              + '&titles=' + encodeURIComponent(pageInfo.title)
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              + '&rvprop=ids|timestamp|comment|user|slotsha1|slotsize|content|roles|flags|tags'
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              + '&rvdir=newer'
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              + (rvcontinue ? '&rvcontinue=' + rvcontinue : '')
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              + (rvstart ? '&rvstart=' + rvstart : '')
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              + '&rvlimit=50'
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            getJson(url, function (err, data) {
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              if (aborted) return err && console.trace(err)
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              if (err) return cb(err)
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              if (data.warnings) console.trace('Warnings:', data.warnings)
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              rvcontinue = data.continue && data.continue.rvcontinue
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              if (!rvcontinue) rvdone = true
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              var page
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              if (data.query) for (var pageid in data.query.pages) {
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                page = data.query.pages[pageid]
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                if (page.title === pageInfo.title) break
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                else page = null
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              }
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              if (!page) {
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                console.trace(data.query.pages, pageInfo)
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                return cb(new Error('Unable to find page'))
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              }
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              var revs = page.revisions
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              if (!revs) {
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                console.trace(page, pageInfo)
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                return cb(new Error('Unable to get revisions'))
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              }
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              console.log('Got ' + page.revisions.length + ' revisions')
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              cb(null, page.revisions)
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            })
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          },
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          pull.flatten(),
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          pull.asyncMap(function (rev, cb) {
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            var waiting = 0
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            for (var slot in rev.slots) (function (slot) {
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              waiting++
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              var slotInfo = rev.slots[slot]
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              var content = slotInfo['*']
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              if (!content) {
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                console.trace(slotInfo)
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                return cb(new Error('Missing content'))
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              }
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              var sha1 = crypto.createHash('sha1').update(content).digest('hex')
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              if (sha1 !== slotInfo.sha1) {
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                console.trace(slotInfo, sha1)
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                return cb(new Error('Mismatched content sha1'))
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              }
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              pull(
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                pull.once(content),
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                sbot.blobs.add(function (err, hash) {
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                  if (err) return cb(err)
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                  slotInfo.link = hash
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                  delete slotInfo['*']
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                  if (!--waiting) cb(null, rev)
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                })
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              )
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            }(slot))
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          })
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        )
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        var queuedRevisions = []
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        var ended
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        function cbDraft(content, cb) {
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          if (!content.revisions.length) {
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            console.log('No revisions for', pageInfo.title)
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            return cb(true)
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          }
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          console.log('Prepared a message',
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            'with', content.revisions.length, 'revisions',
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            'for', pageInfo.title)
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          prevId = '%' + crypto.createHash('sha256').update(JSON.stringify(content)).digest('base64') + '.draft6'
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          cb(null, {
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            draftId: prevId,
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            content: content
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          })
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        }
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        return function (abort, cb) {
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          if (abort) return revisions(abort, cb)
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          if (ended) return cb(true)
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          var content = {
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            type: 'wikimedia/revisions',
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            site: pageInfo.site,
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            title: pageInfo.title,
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            pageId: pageInfo.hash,
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            parents: prevId ? [prevId] : undefined,
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            revisions: queuedRevisions.splice(0)
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          }
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          revisions(null, function next(end, revision) {
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            if (ended = end) return cbDraft(content, cb)
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            content.revisions.push(revision)
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            if (estimateMessageSize(content) > 8192) {
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              queuedRevisions.push(content.revisions.pop())
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              // console.log('filled msg for ', pageInfo.title, ' with ', content.revisions.length, 'revisions')
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              return cbDraft(content, cb)
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            }
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            revisions(null, next)
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          })
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        }
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      }),
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      pull.flatten(),
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      pull.collect(function (err, drafts) {
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        if (err) throw err
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        if (dry) {
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          console.log(JSON.stringify(drafts, 0, 2))
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          return sbot.close()
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        }
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        if (yes) return confirmed(true)
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        var rl = readline.createInterface({
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          input: process.stdin,
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          output: process.stdout
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        })
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        rl.question('Publish ' + drafts.length + ' messages? [Y/n] ', function (answer) {
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          rl.close()
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          confirmed(!/^n/i.test(answer))
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        })
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        function confirmed(yes) {
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          if (!yes) return sbot.close()
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          publishDrafts(sbot, drafts, function (err, msgs) {
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            if (err) throw err
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            console.log('Published:\n' + msgs.map(function (msg) {
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              return msg.key
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            }.join('\n')))
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            sbot.close()
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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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