git ssb

1
var fs = require('fs')
2
var http = require('http')
3
var qs = require('querystring')
4
var path = require('path')
5
var crypto = require('crypto')
6
var pull = require('pull-stream')
7
var paramap = require('pull-paramap')
8
var sort = require('ssb-sort')
9
var toPull = require('stream-to-pull-stream')
10
var memo = require('asyncmemo')
11
var lru = require('lrucache')
12
var webresolve = require('ssb-web-resolver')
13
var serveEmoji = require('emoji-server')()
14
var {
15
  MdRenderer,
16
  renderEmoji,
17
  formatMsgs,
18
  wrapPage,
19
  renderThread,
20
  renderAbout,
21
  renderShowAll,
22
  renderRssItem,
23
  wrapRss,
24
} = require('./render');
25
26
var appHash = hash([fs.readFileSync(__filename)])
27
28
var urlIdRegex = /^(?:\/(([%&@]|%25|%26|%40)(?:[A-Za-z0-9\/+]|%2[Ff]|%2[Bb]){43}(?:=|%3[Dd])\.(?:sha256|ed25519))(?:\.([^?]*))?|(\/.*?))(?:\?(.*))?$/
29
30
function hash(arr) {
31
  return arr.reduce(function (hash, item) {
32
    return hash.update(String(item))
33
  }, crypto.createHash('sha256')).digest('base64')
34
}
35
36
exports.name = 'viewer'
37
exports.manifest = {}
38
exports.version = require('./package').version
39
40
exports.init = function (sbot, config) {
41
  var conf = config.viewer || {}
42
  var port = conf.port || 8807
43
  var host = conf.host || config.host || '::'
44
45
  var base = conf.base || '/'
46
  var defaultOpts = {
47
    base: base,
48
    msg_base: conf.msg_base || base,
49
    feed_base: conf.feed_base || base,
50
    blob_base: conf.blob_base || base,
51
    img_base: conf.img_base || base,
52
    emoji_base: conf.emoji_base || (base + 'emoji/'),
53
  }
54
55
  defaultOpts.marked = {
56
    gfm: true,
57
    mentions: true,
58
    tables: true,
59
    breaks: true,
60
    pedantic: false,
61
    sanitize: true,
62
    smartLists: true,
63
    smartypants: false,
64
    emoji: renderEmoji,
65
    renderer: new MdRenderer(defaultOpts)
66
  }
67
68
  var getMsg = memo({cache: lru(100)}, getMsgWithValue, sbot)
69
  var getAbout = memo({cache: lru(100)}, require('./lib/about'), sbot)
70
  var serveAcmeChallenge = require('ssb-acme-validator')(sbot)
71
72
  http.createServer(serve).listen(port, host, function () {
73
    console.log('[viewer] Listening on http://' + host + ':' + port)
74
  })
75
76
  function serve(req, res) {
77
    if (req.method !== 'GET' && req.method !== 'HEAD') {
78
      return respond(res, 405, 'Method must be GET or HEAD')
79
    }
80
81
    var m = urlIdRegex.exec(req.url)
82
83
    if (req.url.startsWith('/user-feed/')) return serveUserFeed(req, res, m[4])
84
    else if (req.url.startsWith('/channel/')) return serveChannel(req, res, m[4])
85
    else if (req.url.startsWith('/.well-known/acme-challenge')) return serveAcmeChallenge(req, res)
86
    else if (req.url.startsWith('/web/')) return serveWeb(req, res, m[4])
87
88
    if (m[2] && m[2].length === 3) {
89
      m[1] = decodeURIComponent(m[1])
90
      m[2] = m[1][0]
91
    }
92
    switch (m[2]) {
93
      case '%': return serveId(req, res, m[1], m[3], m[5])
94
      case '@': return serveFeed(req, res, m[1], m[3], m[5])
95
      case '&': return serveBlob(req, res, sbot, m[1])
96
      default: return servePath(req, res, m[4], conf)
97
    }
98
  }
99
100
  function serveFeed(req, res, feedId, ext) {
101
    console.log("serving feed: " + feedId)
102
103
    var showAll = req.url.endsWith("?showAll");
104
105
    getAbout(feedId, function (err, about) {
106
      if (err) return respond(res, 500, err.stack || err)
107
108
      function render() {
109
        switch (ext) {
110
          case 'rss':
111
            return pull(
112
              // formatMsgs(feedId, ext, defaultOpts)
113
              renderRssItem(defaultOpts), wrapRss(about.name, defaultOpts)
114
            );
115
          default:
116
            return pull(
117
              renderAbout(defaultOpts, about,
118
                          renderShowAll(showAll, req.url)), wrapPage(about.name)
119
            );
120
        }
121
      }
122
123
      pull(
124
        sbot.createUserStream({ id: feedId, reverse: true, limit: showAll ? -1 : (ext == 'rss' ? 25 : 10) }),
125
        pull.filter(function (data) {
126
          return 'object' === typeof data.value.content
127
        }),
128
        pull.collect(function (err, logs) {
129
          if (err) return respond(res, 500, err.stack || err)
130
          res.writeHead(200, {
131
            'Content-Type': ctype(ext)
132
          })
133
          pull(
134
            pull.values(logs),
135
            paramap(addAuthorAbout, 8),
136
            paramap(addBlog, 8),
137
            paramap(addFollowAbout, 8),
138
            paramap(addVoteMessage, 8),
139
            paramap(addGitLinks, 8),
140
            paramap(addGatheringAbout, 8),
141
            render(),
142
            toPull(res, function (err) {
143
              if (err) console.error('[viewer]', err)
144
            })
145
          )
146
        })
147
      )
148
    })
149
  }
150
151
  function serveWeb (req, res, url) {
152
    var self = this
153
    var id = decodeURIComponent(url.substr(1))
154
155
    var components = url.split('/')
156
    if (components[0] === '') components.shift()
157
    if (components[0] === 'web') components.shift()
158
    components[0] = decodeURIComponent(components[0])
159
160
    webresolve(sbot, components, function (err, data) {
161
      if (err) {
162
        return respond(res, 404, 'ERROR: ' + err)
163
      }
164
      return pull(
165
        pull.once(data),
166
        toPull(res, function (err) {
167
          if (err) console.error('[viewer]', err)
168
        })
169
      )
170
    })
171
  }
172
173
  function serveUserFeed(req, res, url) {
174
    var feedId = url.substring(url.lastIndexOf('user-feed/')+10, 100)
175
    console.log("serving user feed: " + feedId)
176
177
    var following = []
178
    var channelSubscriptions = []
179
    
180
    getAbout(feedId, function (err, about) {
181
      pull(
182
	sbot.createUserStream({ id: feedId }),
183
	pull.filter((msg) => {
184
	  return !msg.value ||
185
	    msg.value.content.type == 'contact' ||
186
	    (msg.value.content.type == 'channel' &&
187
	     typeof msg.value.content.subscribed != 'undefined')
188
	}),
189
	pull.collect(function (err, msgs) {
190
	  msgs.forEach((msg) => {
191
	    if (msg.value.content.type == 'contact')
192
	    {
193
	      if (msg.value.content.following)
194
		following[msg.value.content.contact] = 1
195
	      else
196
		delete following[msg.value.content.contact]
197
	    }
198
	    else // channel subscription
199
	    {
200
	      if (msg.value.content.subscribed)
201
		channelSubscriptions[msg.value.content.channel] = 1
202
	      else
203
		delete channelSubscriptions[msg.value.content.channel]
204
	    }
205
	  })
206
	  
207
	  serveFeeds(req, res, following, channelSubscriptions, feedId,
208
                     'user feed ' + (about ? about.name : ""))
209
	})
210
      )
211
    })
212
  }
213
214
  function serveFeeds(req, res, following, channelSubscriptions, feedId, name) {
215
    var feedOpts = Object.assign({}, defaultOpts, {
216
      renderPrivate: false,
217
      renderSubscribe: false,
218
      renderVote: false,
219
      renderTalenet: false,
220
      renderChess: false,
221
      renderFollow: false,
222
      renderPub: false,
223
      renderAbout: false
224
    })
225
226
    pull(
227
      sbot.createLogStream({ reverse: true, limit: 5000 }),
228
      pull.filter((msg) => {
229
	return !msg.value ||
230
	  (msg.value.author in following ||
231
	   msg.value.content.channel in channelSubscriptions)
232
      }),
233
      pull.take(150),
234
      pull.collect(function (err, logs) {
235
	if (err) return respond(res, 500, err.stack || err)
236
	res.writeHead(200, {
237
	  'Content-Type': ctype("html")
238
	})
239
	pull(
240
	  pull.values(logs),
241
	  paramap(addAuthorAbout, 8),
242
          paramap(addBlog, 8),
243
	  paramap(addFollowAbout, 8),
244
	  paramap(addVoteMessage, 8),
245
	  paramap(addGitLinks, 8),
246
    paramap(addGatheringAbout, 8),
247
	  pull(renderThread(feedOpts), wrapPage(name)),
248
	  toPull(res, function (err) {
249
	    if (err) console.error('[viewer]', err)
250
	  })
251
	)
252
      })
253
    )
254
  }
255
256
  function serveChannel(req, res, url) {
257
    var channelId = url.substring(url.lastIndexOf('channel/')+8, 100)
258
    console.log("serving channel: " + channelId)
259
260
    var showAll = req.url.endsWith("?showAll")
261
    
262
    pull(
263
      sbot.query.read({ limit: showAll ? 300 : 10, reverse: true, query: [{$filter: { value: { content: { channel: channelId }}}}]}),
264
      pull.collect(function (err, logs) {
265
	if (err) return respond(res, 500, err.stack || err)
266
	res.writeHead(200, {
267
	  'Content-Type': ctype("html")
268
	})
269
	pull(
270
	  pull.values(logs),
271
	  paramap(addAuthorAbout, 8),
272
          paramap(addBlog, 8),
273
    paramap(addVoteMessage, 8),
274
    paramap(addGatheringAbout, 8),
275
	  pull(renderThread(defaultOpts, '', renderShowAll(showAll, req.url)),
276
	       wrapPage('#' + channelId)),
277
	  toPull(res, function (err) {
278
	    if (err) console.error('[viewer]', err)
279
	  })
280
	)
281
      })
282
    )
283
  }
284
285
  function serveId(req, res, id, ext, query) {
286
    var q = query ? qs.parse(query) : {}
287
    var includeRoot = !('noroot' in q)
288
    var base = q.base || conf.base
289
    var baseToken
290
    if (!base) {
291
      if (ext === 'js') base = baseToken = '__BASE_' + Math.random() + '_'
292
      else base = '/'
293
    }
294
    var opts = {
295
      base: base,
296
      base_token: baseToken,
297
      msg_base: q.msg_base || conf.msg_base || base,
298
      feed_base: q.feed_base || conf.feed_base || base,
299
      blob_base: q.blob_base || conf.blob_base || base,
300
      img_base: q.img_base || conf.img_base || base,
301
      emoji_base: q.emoji_base || conf.emoji_base || (base + 'emoji/'),
302
    }
303
    opts.marked = {
304
      gfm: true,
305
      mentions: true,
306
      tables: true,
307
      breaks: true,
308
      pedantic: false,
309
      sanitize: true,
310
      smartLists: true,
311
      smartypants: false,
312
      emoji: renderEmoji,
313
      renderer: new MdRenderer(opts)
314
    }
315
316
    var format = formatMsgs(id, ext, opts)
317
    if (format === null) return respond(res, 415, 'Invalid format')
318
319
    function render (links) {
320
      var etag = hash(sort.heads(links).concat(appHash, ext, qs))
321
      if (req.headers['if-none-match'] === etag) return respond(res, 304)
322
      res.writeHead(200, {
323
        'Content-Type': ctype(ext),
324
        'etag': etag
325
      })
326
      pull(
327
        pull.values(sort(links)),
328
        paramap(addAuthorAbout, 8),
329
        paramap(addBlog, 8),
330
        paramap(addGatheringAbout, 8),
331
        format,
332
        toPull(res, function (err) {
333
          if (err) console.error('[viewer]', err)
334
        })
335
      )
336
    }
337
338
    getMsgWithValue(sbot, id, function (err, root) {
339
      if (err) return respond(res, 500, err.stack || err)
340
      if('string' === typeof root.value.content)
341
        return render([root])
342
343
      pull(
344
        sbot.links({dest: id, values: true, rel: 'root' }),
345
        pull.unique('key'),
346
        pull.collect(function (err, links) {
347
          if (err) return respond(res, 500, err.stack || err)
348
          if(includeRoot)
349
            links.unshift(root)
350
          render(links)
351
        })
352
      )
353
    })
354
  }
355
356
  function addFollowAbout(msg, cb) {
357
    if (msg.value.content.contact)
358
      getAbout(msg.value.content.contact, function (err, about) {
359
	if (err) return cb(err)
360
	msg.value.content.contactAbout = about
361
	cb(null, msg)
362
      })
363
    else
364
      cb(null, msg)
365
  }
366
367
  function addVoteMessage(msg, cb) {
368
    if (msg.value.content.type == 'vote' && msg.value.content.vote && msg.value.content.vote.link[0] == '%')
369
      getMsg(msg.value.content.vote.link, function (err, linkedMsg) {
370
	if (linkedMsg)
371
	  msg.value.content.vote.linkedText = linkedMsg.value.content.text
372
	cb(null, msg)
373
      })
374
    else
375
      cb(null, msg)
376
  }
377
378
  function addBlog(msg, cb) {
379
    if (msg.value && msg.value.content.type == "blog") {
380
      pull(
381
        sbot.blobs.get(msg.value.content.blog),
382
        pull.collect(function(err, blob) {
383
          msg.value.content.blogContent = blob
384
          cb(null, msg)
385
        })
386
      )
387
    } else
388
      cb(null, msg)
389
  }
390
391
  function addAuthorAbout(msg, cb) {
392
    getAbout(msg.value.author, function (err, about) {
393
      if (err) return cb(err)
394
      msg.author = about
395
      cb(null, msg)
396
    })
397
  }
398
399
  function addGatheringAbout(msg, cb) {
400
    if (msg.value && msg.value.content.type === 'gathering') {
401
      console.log('adding gathering abouts. msg:', msg)
402
      getAbout(msg.key, (err, about) => {
403
        if (err) { return cb(err) }
404
405
        msg.value.content.about = about
406
        console.log('about gathering', about)
407
        cb(null, msg)
408
      })
409
    } else {
410
      cb(null, msg)
411
    }
412
  }
413
414
  function addGitLinks(msg, cb) {
415
    if (msg.value.content.type == 'git-update')
416
      getMsg(msg.value.content.repo, function (err, gitRepo) {
417
	if (gitRepo)
418
	  msg.value.content.repoName = gitRepo.value.content.name
419
	cb(null, msg)
420
      })
421
    else if (msg.value.content.type == 'issue')
422
      getMsg(msg.value.content.project, function (err, gitRepo) {
423
	if (gitRepo)
424
	  msg.value.content.repoName = gitRepo.value.content.name
425
	cb(null, msg)
426
      })
427
    else
428
      cb(null, msg)
429
  }
430
}
431
432
function serveBlob(req, res, sbot, id) {
433
  if (req.headers['if-none-match'] === id) return respond(res, 304)
434
  sbot.blobs.has(id, function (err, has) {
435
    if (err) {
436
      if (/^invalid/.test(err.message)) return respond(res, 400, err.message)
437
      else return respond(res, 500, err.message || err)
438
    }
439
    if (!has) return respond(res, 404, 'Not found')
440
    res.writeHead(200, {
441
      'Cache-Control': 'public, max-age=315360000',
442
      'etag': id
443
    })
444
    pull(
445
      sbot.blobs.get(id),
446
      toPull(res, function (err) {
447
        if (err) console.error('[viewer]', err)
448
      })
449
    )
450
  })
451
}
452
453
function getMsgWithValue(sbot, id, cb) {
454
  sbot.get(id, function (err, value) {
455
    if (err) return cb(err)
456
    cb(null, {key: id, value: value})
457
  })
458
}
459
460
function respond(res, status, message) {
461
  res.writeHead(status)
462
  res.end(message)
463
}
464
465
function ctype(name) {
466
  switch (name && /[^.\/]*$/.exec(name)[0] || 'html') {
467
    case 'html': return 'text/html'
468
    case 'js': return 'text/javascript'
469
    case 'css': return 'text/css'
470
    case 'json': return 'application/json'
471
    case 'rss': return 'text/xml'
472
  }
473
}
474
475
function servePath(req, res, url, conf) {
476
  switch (url) {
477
    case '/robots.txt': return serveRobots(req, res, conf)
478
  }
479
  var m = /^(\/?[^\/]*)(\/.*)?$/.exec(url)
480
  switch (m[1]) {
481
    case '/static': return serveStatic(req, res, m[2])
482
    case '/emoji': return serveEmoji(req, res, m[2])
483
  }
484
  return respond(res, 404, 'Not found')
485
}
486
487
function ifModified(req, lastMod) {
488
  var ifModSince = req.headers['if-modified-since']
489
  if (!ifModSince) return false
490
  var d = new Date(ifModSince)
491
  return d && Math.floor(d/1000) >= Math.floor(lastMod/1000)
492
}
493
494
function serveStatic(req, res, file) {
495
  serveFile(req, res, path.join(__dirname, 'static', file))
496
}
497
498
function serveFile(req, res, file) {
499
  fs.stat(file, function (err, stat) {
500
    if (err && err.code === 'ENOENT') return respond(res, 404, 'Not found')
501
    if (err) return respond(res, 500, err.stack || err)
502
    if (!stat.isFile()) return respond(res, 403, 'May only load files')
503
    if (ifModified(req, stat.mtime)) return respond(res, 304, 'Not modified')
504
    res.writeHead(200, {
505
      'Content-Type': ctype(file),
506
      'Content-Length': stat.size,
507
      'Last-Modified': stat.mtime.toGMTString()
508
    })
509
    fs.createReadStream(file).pipe(res)
510
  })
511
}
512
513
function serveRobots(req, res, conf) {
514
  res.end('User-agent: *'
515
    + (conf.disallowRobots ? '\nDisallow: /' : ''))
516
}
517
518
function prepend(fn, arg) {
519
  return function (read) {
520
    return function (abort, cb) {
521
      if (fn && !abort) {
522
        var _fn = fn
523
        fn = null
524
        return _fn(arg, function (err, value) {
525
          if (err) return read(err, function (err) {
526
            cb(err || true)
527
          })
528
          cb(null, value)
529
        })
530
      }
531
      read(abort, cb)
532
    }
533
  }
534
}
535