git ssb

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var fs = require('fs')
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var http = require('http')
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var qs = require('querystring')
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var path = require('path')
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var crypto = require('crypto')
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var pull = require('pull-stream')
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var paramap = require('pull-paramap')
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var sort = require('ssb-sort')
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var toPull = require('stream-to-pull-stream')
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var memo = require('asyncmemo')
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var lru = require('lrucache')
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var serveEmoji = require('emoji-server')()
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var {
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  MdRenderer,
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  renderEmoji,
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  formatMsgs,
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  wrapPage,
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  renderThread,
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  renderAbout,
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  renderShowAll,
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  renderRssItem,
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  wrapRss,
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} = require('./render');
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var appHash = hash([fs.readFileSync(__filename)])
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var urlIdRegex = /^(?:\/(([%&@]|%25|%26|%40)(?:[A-Za-z0-9\/+]|%2[Ff]|%2[Bb]){43}(?:=|%3[Dd])\.(?:sha256|ed25519))(?:\.([^?]*))?|(\/.*?))(?:\?(.*))?$/
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function hash(arr) {
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  return arr.reduce(function (hash, item) {
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    return hash.update(String(item))
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  }, crypto.createHash('sha256')).digest('base64')
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}
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exports.name = 'viewer'
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exports.manifest = {}
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exports.version = require('./package').version
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exports.init = function (sbot, config) {
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  var conf = config.viewer || {}
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  var port = conf.port || 8807
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  var host = conf.host || config.host || '::'
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  var base = conf.base || '/'
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  var defaultOpts = {
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    base: base,
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    msg_base: conf.msg_base || base,
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    feed_base: conf.feed_base || base,
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    blob_base: conf.blob_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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  }
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  defaultOpts.marked = {
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    gfm: true,
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    mentions: true,
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    tables: true,
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    breaks: true,
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    pedantic: false,
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    sanitize: true,
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    smartLists: true,
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    smartypants: false,
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    emoji: renderEmoji,
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    renderer: new MdRenderer(defaultOpts)
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  }
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  var getMsg = memo({cache: lru(100)}, getMsgWithValue, sbot)
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  var getAbout = memo({cache: lru(100)}, require('./lib/about'), sbot)
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  var serveAcmeChallenge = require('ssb-acme-validator')(sbot)
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  http.createServer(serve).listen(port, host, function () {
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    console.log('[viewer] Listening on http://' + host + ':' + port)
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  })
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  function serve(req, res) {
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    if (req.method !== 'GET' && req.method !== 'HEAD') {
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      return respond(res, 405, 'Method must be GET or HEAD')
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    }
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    var m = urlIdRegex.exec(req.url)
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    if (req.url.startsWith('/user-feed/')) return serveUserFeed(req, res, m[4])
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    else if (req.url.startsWith('/channel/')) return serveChannel(req, res, m[4])
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    else if (req.url.startsWith('/.well-known/acme-challenge')) return serveAcmeChallenge(req, res)
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    if (m[2] && m[2].length === 3) {
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      m[1] = decodeURIComponent(m[1])
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      m[2] = m[1][0]
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    }
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    switch (m[2]) {
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      case '%': return serveId(req, res, m[1], m[3], m[5])
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      case '@': return serveFeed(req, res, m[1], m[3], m[5])
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      case '&': return serveBlob(req, res, sbot, m[1])
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      default: return servePath(req, res, m[4])
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    }
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  }
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  function serveFeed(req, res, feedId, ext) {
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    console.log("serving feed: " + feedId)
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    var showAll = req.url.endsWith("?showAll");
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    getAbout(feedId, function (err, about) {
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      if (err) return respond(res, 500, err.stack || err)
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      function render() {
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        switch (ext) {
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          case 'rss':
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            return pull(
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              // formatMsgs(feedId, ext, defaultOpts)
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              renderRssItem(defaultOpts), wrapRss(about.name, defaultOpts)
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            );
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          default:
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            return pull(
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              renderAbout(defaultOpts, about,
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                          renderShowAll(showAll, req.url)), wrapPage(about.name)
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            );
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        }
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      }
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      pull(
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        sbot.createUserStream({ id: feedId, reverse: true, limit: showAll ? -1 : (ext == 'rss' ? 25 : 10) }),
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        pull.collect(function (err, logs) {
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          if (err) return respond(res, 500, err.stack || err)
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          res.writeHead(200, {
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            'Content-Type': ctype(ext)
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          })
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          pull(
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            pull.values(logs),
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            paramap(addAuthorAbout, 8),
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            paramap(addFollowAbout, 8),
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            paramap(addVoteMessage, 8),
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            paramap(addGitLinks, 8),
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            render(),
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            toPull(res, function (err) {
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              if (err) console.error('[viewer]', err)
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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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  function serveUserFeed(req, res, url) {
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    var feedId = url.substring(url.lastIndexOf('user-feed/')+10, 100)
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    console.log("serving user feed: " + feedId)
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    var following = []
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    var channelSubscriptions = []
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    getAbout(feedId, function (err, about) {
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      pull(
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	sbot.createUserStream({ id: feedId }),
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	pull.filter((msg) => {
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	  return !msg.value ||
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	    msg.value.content.type == 'contact' ||
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	    (msg.value.content.type == 'channel' &&
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	     typeof msg.value.content.subscribed != 'undefined')
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	}),
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	pull.collect(function (err, msgs) {
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	  msgs.forEach((msg) => {
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	    if (msg.value.content.type == 'contact')
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	    {
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	      if (msg.value.content.following)
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		following[msg.value.content.contact] = 1
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	      else
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		delete following[msg.value.content.contact]
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	    }
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	    else // channel subscription
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	    {
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	      if (msg.value.content.subscribed)
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		channelSubscriptions[msg.value.content.channel] = 1
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	      else
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		delete channelSubscriptions[msg.value.content.channel]
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	    }
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	  })
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	  serveFeeds(req, res, following, channelSubscriptions, feedId,
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                     'user feed ' + (about ? about.name : ""))
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	})
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      )
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    })
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  }
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  function serveFeeds(req, res, following, channelSubscriptions, feedId, name) {
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    var feedOpts = Object.assign({}, defaultOpts, {
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      renderPrivate: false,
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      renderSubscribe: false,
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      renderAbout: false
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    })
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    pull(
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      sbot.createLogStream({ reverse: true, limit: 5000 }),
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      pull.filter((msg) => {
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	return !msg.value ||
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	  (msg.value.author in following ||
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	   msg.value.content.channel in channelSubscriptions)
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      }),
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      pull.take(150),
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      pull.collect(function (err, logs) {
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	if (err) return respond(res, 500, err.stack || err)
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	res.writeHead(200, {
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	  'Content-Type': ctype("html")
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	})
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	pull(
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	  pull.values(logs),
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	  paramap(addAuthorAbout, 8),
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	  paramap(addFollowAbout, 8),
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	  paramap(addVoteMessage, 8),
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	  paramap(addGitLinks, 8),
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	  pull(renderThread(feedOpts), wrapPage(name)),
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	  toPull(res, function (err) {
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	    if (err) console.error('[viewer]', err)
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	  })
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	)
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      })
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    )
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  }
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  function serveChannel(req, res, url) {
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    var channelId = url.substring(url.lastIndexOf('channel/')+8, 100)
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    console.log("serving channel: " + channelId)
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    var showAll = req.url.endsWith("?showAll")
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    pull(
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      sbot.query.read({ limit: showAll ? 300 : 10, reverse: true, query: [{$filter: { value: { content: { channel: channelId }}}}]}),
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      pull.collect(function (err, logs) {
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	if (err) return respond(res, 500, err.stack || err)
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	res.writeHead(200, {
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	  'Content-Type': ctype("html")
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	})
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	pull(
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	  pull.values(logs),
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	  paramap(addAuthorAbout, 8),
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	  paramap(addVoteMessage, 8),
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	  pull(renderThread(defaultOpts, '',
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			    renderShowAll(showAll, req.url)),
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	       wrapPage('#' + channelId)),
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	  toPull(res, function (err) {
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	    if (err) console.error('[viewer]', err)
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	  })
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	)
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      })
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    )
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  }
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  function serveId(req, res, id, ext, query) {
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    var q = query ? qs.parse(query) : {}
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    var includeRoot = !('noroot' in q)
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    var base = q.base || conf.base
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    var baseToken
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    if (!base) {
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      if (ext === 'js') base = baseToken = '__BASE_' + Math.random() + '_'
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      else base = '/'
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    }
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    var opts = {
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      base: base,
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      base_token: baseToken,
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      msg_base: q.msg_base || conf.msg_base || base,
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      feed_base: q.feed_base || conf.feed_base || base,
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      blob_base: q.blob_base || conf.blob_base || base,
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      img_base: q.img_base || conf.img_base || base,
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      emoji_base: q.emoji_base || conf.emoji_base || (base + 'emoji/'),
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    }
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    opts.marked = {
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      gfm: true,
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      mentions: true,
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      tables: true,
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      breaks: true,
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      pedantic: false,
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      sanitize: true,
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      smartLists: true,
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      smartypants: false,
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      emoji: renderEmoji,
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      renderer: new MdRenderer(opts)
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    }
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    var format = formatMsgs(id, ext, opts)
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    if (format === null) return respond(res, 415, 'Invalid format')
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    pull(
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      sbot.links({dest: id, values: true }),
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      includeRoot && prepend(getMsg, id),
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      pull.unique('key'),
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      pull.collect(function (err, links) {
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        if (err) return respond(res, 500, err.stack || err)
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        var etag = hash(sort.heads(links).concat(appHash, ext, qs))
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        if (req.headers['if-none-match'] === etag) return respond(res, 304)
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        res.writeHead(200, {
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          'Content-Type': ctype(ext),
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          'etag': etag
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        })
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        pull(
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          pull.values(sort(links)),
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          paramap(addAuthorAbout, 8),
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          format,
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          toPull(res, function (err) {
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            if (err) console.error('[viewer]', err)
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          })
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        )
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      })
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    )
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  }
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  function addFollowAbout(msg, cb) {
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    if (msg.value.content.contact)
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      getAbout(msg.value.content.contact, function (err, about) {
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	if (err) return cb(err)
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	msg.value.content.contactAbout = about
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	cb(null, msg)
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      })
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    else
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      cb(null, msg)
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  }
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  function addVoteMessage(msg, cb) {
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    if (msg.value.content.type == 'vote' && msg.value.content.vote.link[0] == '%')
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      getMsg(msg.value.content.vote.link, function (err, linkedMsg) {
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	if (linkedMsg)
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	  msg.value.content.vote.linkedText = linkedMsg.value.content.text
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	cb(null, msg)
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      })
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    else
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      cb(null, msg)
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  }
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  function addAuthorAbout(msg, cb) {
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    getAbout(msg.value.author, function (err, about) {
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      if (err) return cb(err)
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      msg.author = about
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      cb(null, msg)
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    })
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  }
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  function addGitLinks(msg, cb) {
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    if (msg.value.content.type == 'git-update')
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      getMsg(msg.value.content.repo, function (err, gitRepo) {
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	if (gitRepo)
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	  msg.value.content.repoName = gitRepo.value.content.name
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	cb(null, msg)
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      })
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    else if (msg.value.content.type == 'issue')
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      getMsg(msg.value.content.project, function (err, gitRepo) {
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	if (gitRepo)
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	  msg.value.content.repoName = gitRepo.value.content.name
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	cb(null, msg)
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      })
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    else
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      cb(null, msg)
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  }
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}
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function serveBlob(req, res, sbot, id) {
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  if (req.headers['if-none-match'] === id) return respond(res, 304)
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  sbot.blobs.has(id, function (err, has) {
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    if (err) {
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      if (/^invalid/.test(err.message)) return respond(res, 400, err.message)
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      else return respond(res, 500, err.message || err)
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    }
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    if (!has) return respond(res, 404, 'Not found')
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    res.writeHead(200, {
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      'Cache-Control': 'public, max-age=315360000',
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      'etag': id
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    })
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    pull(
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      sbot.blobs.get(id),
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      toPull(res, function (err) {
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        if (err) console.error('[viewer]', err)
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      })
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    )
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  })
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}
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function getMsgWithValue(sbot, id, 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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function respond(res, status, message) {
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  res.writeHead(status)
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  res.end(message)
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}
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function ctype(name) {
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  switch (name && /[^.\/]*$/.exec(name)[0] || 'html') {
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    case 'html': return 'text/html'
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    case 'js': return 'text/javascript'
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    case 'css': return 'text/css'
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    case 'json': return 'application/json'
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    case 'rss': return 'text/xml'
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  }
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}
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function servePath(req, res, url) {
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  switch (url) {
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    case '/robots.txt': return res.end('User-agent: *')
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  }
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  var m = /^(\/?[^\/]*)(\/.*)?$/.exec(url)
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  switch (m[1]) {
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    case '/static': return serveStatic(req, res, m[2])
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    case '/emoji': return serveEmoji(req, res, m[2])
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  }
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  return respond(res, 404, 'Not found')
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}
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function ifModified(req, lastMod) {
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  var ifModSince = req.headers['if-modified-since']
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  if (!ifModSince) return false
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  var d = new Date(ifModSince)
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  return d && Math.floor(d/1000) >= Math.floor(lastMod/1000)
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}
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function serveStatic(req, res, file) {
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  serveFile(req, res, path.join(__dirname, 'static', file))
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}
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function serveFile(req, res, file) {
421
  fs.stat(file, function (err, stat) {
422
    if (err && err.code === 'ENOENT') return respond(res, 404, 'Not found')
423
    if (err) return respond(res, 500, err.stack || err)
424
    if (!stat.isFile()) return respond(res, 403, 'May only load files')
425
    if (ifModified(req, stat.mtime)) return respond(res, 304, 'Not modified')
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    res.writeHead(200, {
427
      'Content-Type': ctype(file),
428
      'Content-Length': stat.size,
429
      'Last-Modified': stat.mtime.toGMTString()
430
    })
431
    fs.createReadStream(file).pipe(res)
432
  })
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}
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function prepend(fn, arg) {
436
  return function (read) {
437
    return function (abort, cb) {
438
      if (fn && !abort) {
439
        var _fn = fn
440
        fn = null
441
        return _fn(arg, function (err, value) {
442
          if (err) return read(err, function (err) {
443
            cb(err || true)
444
          })
445
          cb(null, value)
446
        })
447
      }
448
      read(abort, cb)
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    }
450
  }
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}
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