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])
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
            render(),
141
            toPull(res, function (err) {
142
              if (err) console.error('[viewer]', err)
143
            })
144
          )
145
        })
146
      )
147
    })
148
  }
149
150
  function serveWeb (req, res, url) {
151
    var self = this
152
    var id = decodeURIComponent(url.substr(1))
153
154
    var components = url.split('/')
155
    if (components[0] === '') components.shift()
156
    if (components[0] === 'web') components.shift()
157
    components[0] = decodeURIComponent(components[0])
158
159
    webresolve(sbot, components, function (err, data) {
160
      if (err) {
161
        return respond(res, 404, 'ERROR: ' + err)
162
      }
163
      return pull(
164
        pull.once(data),
165
        toPull(res, function (err) {
166
          if (err) console.error('[viewer]', err)
167
        })
168
      )
169
    })
170
  }
171
172
  function serveUserFeed(req, res, url) {
173
    var feedId = url.substring(url.lastIndexOf('user-feed/')+10, 100)
174
    console.log("serving user feed: " + feedId)
175
176
    var following = []
177
    var channelSubscriptions = []
178
    
179
    getAbout(feedId, function (err, about) {
180
      pull(
181
	sbot.createUserStream({ id: feedId }),
182
	pull.filter((msg) => {
183
	  return !msg.value ||
184
	    msg.value.content.type == 'contact' ||
185
	    (msg.value.content.type == 'channel' &&
186
	     typeof msg.value.content.subscribed != 'undefined')
187
	}),
188
	pull.collect(function (err, msgs) {
189
	  msgs.forEach((msg) => {
190
	    if (msg.value.content.type == 'contact')
191
	    {
192
	      if (msg.value.content.following)
193
		following[msg.value.content.contact] = 1
194
	      else
195
		delete following[msg.value.content.contact]
196
	    }
197
	    else // channel subscription
198
	    {
199
	      if (msg.value.content.subscribed)
200
		channelSubscriptions[msg.value.content.channel] = 1
201
	      else
202
		delete channelSubscriptions[msg.value.content.channel]
203
	    }
204
	  })
205
	  
206
	  serveFeeds(req, res, following, channelSubscriptions, feedId,
207
                     'user feed ' + (about ? about.name : ""))
208
	})
209
      )
210
    })
211
  }
212
213
  function serveFeeds(req, res, following, channelSubscriptions, feedId, name) {
214
    var feedOpts = Object.assign({}, defaultOpts, {
215
      renderPrivate: false,
216
      renderSubscribe: false,
217
      renderAbout: false
218
    })
219
220
    pull(
221
      sbot.createLogStream({ reverse: true, limit: 5000 }),
222
      pull.filter((msg) => {
223
	return !msg.value ||
224
	  (msg.value.author in following ||
225
	   msg.value.content.channel in channelSubscriptions)
226
      }),
227
      pull.take(150),
228
      pull.collect(function (err, logs) {
229
	if (err) return respond(res, 500, err.stack || err)
230
	res.writeHead(200, {
231
	  'Content-Type': ctype("html")
232
	})
233
	pull(
234
	  pull.values(logs),
235
	  paramap(addAuthorAbout, 8),
236
          paramap(addBlog, 8),
237
	  paramap(addFollowAbout, 8),
238
	  paramap(addVoteMessage, 8),
239
	  paramap(addGitLinks, 8),
240
	  pull(renderThread(feedOpts), wrapPage(name)),
241
	  toPull(res, function (err) {
242
	    if (err) console.error('[viewer]', err)
243
	  })
244
	)
245
      })
246
    )
247
  }
248
249
  function serveChannel(req, res, url) {
250
    var channelId = url.substring(url.lastIndexOf('channel/')+8, 100)
251
    console.log("serving channel: " + channelId)
252
253
    var showAll = req.url.endsWith("?showAll")
254
    
255
    pull(
256
      sbot.query.read({ limit: showAll ? 300 : 10, reverse: true, query: [{$filter: { value: { content: { channel: channelId }}}}]}),
257
      pull.collect(function (err, logs) {
258
	if (err) return respond(res, 500, err.stack || err)
259
	res.writeHead(200, {
260
	  'Content-Type': ctype("html")
261
	})
262
	pull(
263
	  pull.values(logs),
264
	  paramap(addAuthorAbout, 8),
265
          paramap(addBlog, 8),
266
	  paramap(addVoteMessage, 8),
267
	  pull(renderThread(defaultOpts, '', renderShowAll(showAll, req.url)),
268
	       wrapPage('#' + channelId)),
269
	  toPull(res, function (err) {
270
	    if (err) console.error('[viewer]', err)
271
	  })
272
	)
273
      })
274
    )
275
  }
276
277
  function serveId(req, res, id, ext, query) {
278
    var q = query ? qs.parse(query) : {}
279
    var includeRoot = !('noroot' in q)
280
    var base = q.base || conf.base
281
    var baseToken
282
    if (!base) {
283
      if (ext === 'js') base = baseToken = '__BASE_' + Math.random() + '_'
284
      else base = '/'
285
    }
286
    var opts = {
287
      base: base,
288
      base_token: baseToken,
289
      msg_base: q.msg_base || conf.msg_base || base,
290
      feed_base: q.feed_base || conf.feed_base || base,
291
      blob_base: q.blob_base || conf.blob_base || base,
292
      img_base: q.img_base || conf.img_base || base,
293
      emoji_base: q.emoji_base || conf.emoji_base || (base + 'emoji/'),
294
    }
295
    opts.marked = {
296
      gfm: true,
297
      mentions: true,
298
      tables: true,
299
      breaks: true,
300
      pedantic: false,
301
      sanitize: true,
302
      smartLists: true,
303
      smartypants: false,
304
      emoji: renderEmoji,
305
      renderer: new MdRenderer(opts)
306
    }
307
308
    var format = formatMsgs(id, ext, opts)
309
    if (format === null) return respond(res, 415, 'Invalid format')
310
311
    function render (links) {
312
      var etag = hash(sort.heads(links).concat(appHash, ext, qs))
313
      if (req.headers['if-none-match'] === etag) return respond(res, 304)
314
      res.writeHead(200, {
315
        'Content-Type': ctype(ext),
316
        'etag': etag
317
      })
318
      pull(
319
        pull.values(sort(links)),
320
        paramap(addAuthorAbout, 8),
321
        paramap(addBlog, 8),
322
        format,
323
        toPull(res, function (err) {
324
          if (err) console.error('[viewer]', err)
325
        })
326
      )
327
    }
328
329
    getMsgWithValue(sbot, id, function (err, root) {
330
      if (err) return respond(res, 500, err.stack || err)
331
      if('string' === typeof root.value.content)
332
        return render([root])
333
334
      pull(
335
        sbot.links({dest: id, values: true, rel: 'root' }),
336
        pull.unique('key'),
337
        pull.collect(function (err, links) {
338
          if (err) return respond(res, 500, err.stack || err)
339
          if(includeRoot)
340
            links.unshift(root)
341
          render(links)
342
        })
343
      )
344
    })
345
  }
346
347
  function addFollowAbout(msg, cb) {
348
    if (msg.value.content.contact)
349
      getAbout(msg.value.content.contact, function (err, about) {
350
	if (err) return cb(err)
351
	msg.value.content.contactAbout = about
352
	cb(null, msg)
353
      })
354
    else
355
      cb(null, msg)
356
  }
357
358
  function addVoteMessage(msg, cb) {
359
    if (msg.value.content.type == 'vote' && msg.value.content.vote && msg.value.content.vote.link[0] == '%')
360
      getMsg(msg.value.content.vote.link, function (err, linkedMsg) {
361
	if (linkedMsg)
362
	  msg.value.content.vote.linkedText = linkedMsg.value.content.text
363
	cb(null, msg)
364
      })
365
    else
366
      cb(null, msg)
367
  }
368
369
  function addBlog(msg, cb) {
370
    if (msg.value && msg.value.content.type == "blog") {
371
      pull(
372
        sbot.blobs.get(msg.value.content.blog),
373
        pull.collect(function(err, blob) {
374
          msg.value.content.blogContent = blob
375
          cb(null, msg)
376
        })
377
      )
378
    } else
379
      cb(null, msg)
380
  }
381
382
  function addAuthorAbout(msg, cb) {
383
    getAbout(msg.value.author, function (err, about) {
384
      if (err) return cb(err)
385
      msg.author = about
386
      cb(null, msg)
387
    })
388
  }
389
390
  function addGitLinks(msg, cb) {
391
    if (msg.value.content.type == 'git-update')
392
      getMsg(msg.value.content.repo, function (err, gitRepo) {
393
	if (gitRepo)
394
	  msg.value.content.repoName = gitRepo.value.content.name
395
	cb(null, msg)
396
      })
397
    else if (msg.value.content.type == 'issue')
398
      getMsg(msg.value.content.project, function (err, gitRepo) {
399
	if (gitRepo)
400
	  msg.value.content.repoName = gitRepo.value.content.name
401
	cb(null, msg)
402
      })
403
    else
404
      cb(null, msg)
405
  }
406
}
407
408
function serveBlob(req, res, sbot, id) {
409
  if (req.headers['if-none-match'] === id) return respond(res, 304)
410
  sbot.blobs.has(id, function (err, has) {
411
    if (err) {
412
      if (/^invalid/.test(err.message)) return respond(res, 400, err.message)
413
      else return respond(res, 500, err.message || err)
414
    }
415
    if (!has) return respond(res, 404, 'Not found')
416
    res.writeHead(200, {
417
      'Cache-Control': 'public, max-age=315360000',
418
      'etag': id
419
    })
420
    pull(
421
      sbot.blobs.get(id),
422
      toPull(res, function (err) {
423
        if (err) console.error('[viewer]', err)
424
      })
425
    )
426
  })
427
}
428
429
function getMsgWithValue(sbot, id, cb) {
430
  sbot.get(id, function (err, value) {
431
    if (err) return cb(err)
432
    cb(null, {key: id, value: value})
433
  })
434
}
435
436
function respond(res, status, message) {
437
  res.writeHead(status)
438
  res.end(message)
439
}
440
441
function ctype(name) {
442
  switch (name && /[^.\/]*$/.exec(name)[0] || 'html') {
443
    case 'html': return 'text/html'
444
    case 'js': return 'text/javascript'
445
    case 'css': return 'text/css'
446
    case 'json': return 'application/json'
447
    case 'rss': return 'text/xml'
448
  }
449
}
450
451
function servePath(req, res, url) {
452
  switch (url) {
453
    case '/robots.txt': return res.end('User-agent: *')
454
  }
455
  var m = /^(\/?[^\/]*)(\/.*)?$/.exec(url)
456
  switch (m[1]) {
457
    case '/static': return serveStatic(req, res, m[2])
458
    case '/emoji': return serveEmoji(req, res, m[2])
459
  }
460
  return respond(res, 404, 'Not found')
461
}
462
463
function ifModified(req, lastMod) {
464
  var ifModSince = req.headers['if-modified-since']
465
  if (!ifModSince) return false
466
  var d = new Date(ifModSince)
467
  return d && Math.floor(d/1000) >= Math.floor(lastMod/1000)
468
}
469
470
function serveStatic(req, res, file) {
471
  serveFile(req, res, path.join(__dirname, 'static', file))
472
}
473
474
function serveFile(req, res, file) {
475
  fs.stat(file, function (err, stat) {
476
    if (err && err.code === 'ENOENT') return respond(res, 404, 'Not found')
477
    if (err) return respond(res, 500, err.stack || err)
478
    if (!stat.isFile()) return respond(res, 403, 'May only load files')
479
    if (ifModified(req, stat.mtime)) return respond(res, 304, 'Not modified')
480
    res.writeHead(200, {
481
      'Content-Type': ctype(file),
482
      'Content-Length': stat.size,
483
      'Last-Modified': stat.mtime.toGMTString()
484
    })
485
    fs.createReadStream(file).pipe(res)
486
  })
487
}
488
489
function prepend(fn, arg) {
490
  return function (read) {
491
    return function (abort, cb) {
492
      if (fn && !abort) {
493
        var _fn = fn
494
        fn = null
495
        return _fn(arg, function (err, value) {
496
          if (err) return read(err, function (err) {
497
            cb(err || true)
498
          })
499
          cb(null, value)
500
        })
501
      }
502
      read(abort, cb)
503
    }
504
  }
505
}
506