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 about = require('./lib/about')
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  var getAbout = memo({cache: lru(100)}, about, sbot)
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  var lastRefresh = Date.now()
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  function ensureFreshAboutCache(cb) {
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    if (about.allAbouts && (lastRefresh - Date.now()) / 1000 < 30 * 60) {
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      cb()
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    } else {
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      sbot.about.get((err, allAbouts) => {
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        about.allAbouts = allAbouts
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        cb()
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      })
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    }
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  }
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  var getMsg = memo({cache: lru(100)}, getMsgWithValue, sbot)
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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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  exports.serveFeed = function(req, res, feedId, ext) {
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    ensureFreshAboutCache(() => {
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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(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,
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                                  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(addBlog, 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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  }
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  exports.serveUserFeed = function(req, res, feedId) {
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    ensureFreshAboutCache(() => {
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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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  }
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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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      renderVote: false,
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      renderTalenet: false,
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      renderChess: false,
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      renderFollow: false,
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      renderPub: 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(addBlog, 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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  exports.serveChannel = function(req, res, channelId) {
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    ensureFreshAboutCache(() => {
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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,
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                          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(addBlog, 8),
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	    paramap(addVoteMessage, 8),
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	    pull(renderThread(defaultOpts, '', renderShowAll(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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  }
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  exports.serveId = function(req, res, id, ext, query) {
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    ensureFreshAboutCache(() => {
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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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            paramap(addBlog, 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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  }
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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 && 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 addBlog(msg, cb) {
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    if (msg.value && msg.value.content.type == "blog") {
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      pull(
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        sbot.blobs.get(msg.value.content.blog),
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        pull.collect(function(err, blob) {
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          msg.value.content.blogContent = blob
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          cb(null, msg)
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        })
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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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exports.serveHttp = 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 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)
381
  })
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  function serve(req, res) {
384
    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/'))
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      return exports.serveUserFeed(req, res, m[4].substring(m[4].lastIndexOf('user-feed/')+10, 100))
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    else if (req.url.startsWith('/channel/'))
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      return exports.serveChannel(req, res, m[4].substring(m[4].lastIndexOf('channel/')+8, 100))
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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) {
397
      m[1] = decodeURIComponent(m[1])
398
      m[2] = m[1][0]
399
    }
400
    switch (m[2]) {
401
      case '%': return exports.serveId(req, res, m[1], m[3], m[5])
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      case '@': return exports.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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}
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function serveBlob(req, res, sbot, id) {
410
  if (req.headers['if-none-match'] === id) return respond(res, 304)
411
  sbot.blobs.has(id, function (err, has) {
412
    if (err) {
413
      if (/^invalid/.test(err.message)) return respond(res, 400, err.message)
414
      else return respond(res, 500, err.message || err)
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    }
416
    if (!has) return respond(res, 404, 'Not found')
417
    res.writeHead(200, {
418
      'Cache-Control': 'public, max-age=315360000',
419
      'etag': id
420
    })
421
    pull(
422
      sbot.blobs.get(id),
423
      toPull(res, function (err) {
424
        if (err) console.error('[viewer]', err)
425
      })
426
    )
427
  })
428
}
429
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function getMsgWithValue(sbot, id, cb) {
431
  sbot.get(id, function (err, value) {
432
    if (err) return cb(err)
433
    cb(null, {key: id, value: value})
434
  })
435
}
436
437
function respond(res, status, message) {
438
  res.writeHead(status)
439
  res.end(message)
440
}
441
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function ctype(name) {
443
  switch (name && /[^.\/]*$/.exec(name)[0] || 'html') {
444
    case 'html': return 'text/html'
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    case 'js': return 'text/javascript'
446
    case 'css': return 'text/css'
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    case 'json': return 'application/json'
448
    case 'rss': return 'text/xml'
449
  }
450
}
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function servePath(req, res, url) {
453
  switch (url) {
454
    case '/robots.txt': return res.end('User-agent: *')
455
  }
456
  var m = /^(\/?[^\/]*)(\/.*)?$/.exec(url)
457
  switch (m[1]) {
458
    case '/static': return serveStatic(req, res, m[2])
459
    case '/emoji': return serveEmoji(req, res, m[2])
460
  }
461
  return respond(res, 404, 'Not found')
462
}
463
464
function ifModified(req, lastMod) {
465
  var ifModSince = req.headers['if-modified-since']
466
  if (!ifModSince) return false
467
  var d = new Date(ifModSince)
468
  return d && Math.floor(d/1000) >= Math.floor(lastMod/1000)
469
}
470
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function serveStatic(req, res, file) {
472
  serveFile(req, res, path.join(__dirname, 'static', file))
473
}
474
475
function serveFile(req, res, file) {
476
  fs.stat(file, function (err, stat) {
477
    if (err && err.code === 'ENOENT') return respond(res, 404, 'Not found')
478
    if (err) return respond(res, 500, err.stack || err)
479
    if (!stat.isFile()) return respond(res, 403, 'May only load files')
480
    if (ifModified(req, stat.mtime)) return respond(res, 304, 'Not modified')
481
    res.writeHead(200, {
482
      'Content-Type': ctype(file),
483
      'Content-Length': stat.size,
484
      'Last-Modified': stat.mtime.toGMTString()
485
    })
486
    fs.createReadStream(file).pipe(res)
487
  })
488
}
489
490
function prepend(fn, arg) {
491
  return function (read) {
492
    return function (abort, cb) {
493
      if (fn && !abort) {
494
        var _fn = fn
495
        fn = null
496
        return _fn(arg, function (err, value) {
497
          if (err) return read(err, function (err) {
498
            cb(err || true)
499
          })
500
          cb(null, value)
501
        })
502
      }
503
      read(abort, cb)
504
    }
505
  }
506
}
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