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