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 serveEmoji = require('emoji-server')()
13
var {
14
    MdRenderer,
15
    renderEmoji,
16
    formatMsgs,
17
    wrapPage,
18
    renderThread,
19
    renderAbout
20
} = require('./render');
21
22
var appHash = hash([fs.readFileSync(__filename)])
23
24
var urlIdRegex = /^(?:\/(([%&@]|%25|%26|%40)(?:[A-Za-z0-9\/+]|%2[Ff]|%2[Bb]){43}(?:=|%3[Dd])\.(?:sha256|ed25519))(?:\.([^?]*))?|(\/.*?))(?:\?(.*))?$/
25
26
function hash(arr) {
27
  return arr.reduce(function (hash, item) {
28
    return hash.update(String(item))
29
  }, crypto.createHash('sha256')).digest('base64')
30
}
31
32
exports.name = 'viewer'
33
exports.manifest = {}
34
exports.version = require('./package').version
35
36
exports.init = function (sbot, config) {
37
  var conf = config.viewer || {}
38
  var port = conf.port || 8807
39
  var host = conf.host || config.host || '::'
40
41
  var base = conf.base || '/'
42
  var defaultOpts = {
43
    base: base,
44
    msg_base: conf.msg_base || base,
45
    feed_base: conf.feed_base || base,
46
    blob_base: conf.blob_base || base,
47
    img_base: conf.img_base || base,
48
    emoji_base: conf.emoji_base || (base + 'emoji/'),
49
  }
50
51
  defaultOpts.marked = {
52
      gfm: true,
53
      mentions: true,
54
      tables: true,
55
      breaks: true,
56
      pedantic: false,
57
      sanitize: true,
58
      smartLists: true,
59
      smartypants: false,
60
      emoji: renderEmoji,
61
      renderer: new MdRenderer(defaultOpts)
62
  }
63
64
  var getMsg = memo({cache: lru(100)}, getMsgWithValue, sbot)
65
  var getAbout = memo({cache: lru(100)}, require('./lib/about'), sbot)
66
67
  http.createServer(serve).listen(port, host, function () {
68
    console.log('[viewer] Listening on http://' + host + ':' + port)
69
  })
70
71
  function serve(req, res) {
72
    if (req.method !== 'GET' && req.method !== 'HEAD') {
73
      return respond(res, 405, 'Method must be GET or HEAD')
74
    }
75
76
    var m = urlIdRegex.exec(req.url)
77
78
    if (req.url.startsWith('/user-feed/')) return serveUserFeed(req, res, m[4])
79
    else if (req.url.startsWith('/channel/')) return serveChannel(req, res, m[4])
80
81
    if (m[2] && m[2].length === 3) {
82
      m[1] = decodeURIComponent(m[1])
83
      m[2] = m[1][0]
84
    }
85
    switch (m[2]) {
86
      case '%': return serveId(req, res, m[1], m[3], m[5])
87
      case '@': return serveFeed(req, res, m[1], m[3], m[5])
88
      case '&': return serveBlob(req, res, sbot, m[1])
89
      default: return servePath(req, res, m[4])
90
    }
91
  }
92
93
  function serveFeed(req, res, feedId) {
94
      console.log("serving feed: " + feedId)
95
96
      getAbout(feedId, function (err, about) {
97
	  if (err) return cb(err)
98
99
	  pull(
100
	      sbot.createUserStream({ id: feedId, reverse: true }),
101
	      pull.collect(function (err, logs) {
102
		  if (err) return respond(res, 500, err.stack || err)
103
		  res.writeHead(200, {
104
		      'Content-Type': ctype("html")
105
		  })
106
		  pull(
107
		      pull.values(logs),
108
		      paramap(addAuthorAbout, 8),
109
		      paramap(addFollowAbout, 8),
110
		      paramap(addVoteMessage, 8),
111
		      paramap(addGitLinks, 8),
112
		      pull(renderAbout(defaultOpts, about), wrapPage(about.name)),
113
		      toPull(res, function (err) {
114
			  if (err) console.error('[viewer]', err)
115
		      })
116
		  )
117
	      })
118
	  )
119
      })
120
  }
121
122
  function serveUserFeed(req, res, url) {
123
      var feedId = url.substring(url.lastIndexOf('user-feed/')+10, 100)
124
      console.log("serving user feed: " + feedId)
125
126
      var following = []
127
      var channelSubscriptions = []
128
      
129
      getAbout(feedId, function (err, about) {
130
	  pull(
131
	      sbot.createUserStream({ id: feedId }),
132
	      pull.filter((msg) => {
133
		  return !msg.value ||
134
		      msg.value.content.type == 'contact' ||
135
		      (msg.value.content.type == 'channel' &&
136
		       typeof msg.value.content.subscribed != 'undefined')
137
	      }),
138
	      pull.collect(function (err, msgs) {
139
		  msgs.forEach((msg) => {
140
		      if (msg.value.content.type == 'contact')
141
		      {
142
			  if (msg.value.content.following)
143
			      following[msg.value.content.contact] = 1
144
			  else
145
			      delete following[msg.value.content.contact]
146
		      }
147
		      else // channel subscription
148
		      {
149
			  if (msg.value.content.subscribed)
150
			      channelSubscriptions[msg.value.content.channel] = 1
151
			  else
152
			      delete channelSubscriptions[msg.value.content.channel]
153
		      }
154
		  })
155
		  
156
		  serveFeeds(req, res, following, channelSubscriptions, feedId, 'user feed ' + about.name)
157
	      })
158
	  )
159
      })
160
  }
161
162
  function serveFeeds(req, res, following, channelSubscriptions, feedId, name) {
163
      pull(
164
	  sbot.createLogStream({ reverse: true, limit: 2500 }),
165
	  pull.filter((msg) => {
166
	      return !msg.value ||
167
		  (msg.value.author in following ||
168
		   msg.value.content.channel in channelSubscriptions)
169
	  }),
170
	  pull.take(100),
171
	  pull.collect(function (err, logs) {
172
	      if (err) return respond(res, 500, err.stack || err)
173
	      res.writeHead(200, {
174
		  'Content-Type': ctype("html")
175
	      })
176
	      pull(
177
		  pull.values(logs),
178
		  paramap(addAuthorAbout, 8),
179
		  paramap(addFollowAbout, 8),
180
		  paramap(addVoteMessage, 8),
181
		  paramap(addGitLinks, 8),
182
		  pull(renderThread(defaultOpts), wrapPage(name)),
183
		  toPull(res, function (err) {
184
		      if (err) console.error('[viewer]', err)
185
		  })
186
	      )
187
	  })
188
      )
189
  }
190
191
  function serveChannel(req, res, url) {
192
      var channelId = url.substring(url.lastIndexOf('channel/')+8, 100)
193
      console.log("serving channel: " + channelId)
194
      
195
      pull(
196
	  sbot.query.read({ limit: 500, reverse: true, query: [{$filter: { value: { content: { channel: channelId }}}}]}),
197
	  pull.collect(function (err, logs) {
198
	      if (err) return respond(res, 500, err.stack || err)
199
	      res.writeHead(200, {
200
		  'Content-Type': ctype("html")
201
	      })
202
	      pull(
203
		  pull.values(logs),
204
		  paramap(addAuthorAbout, 8),
205
		  paramap(addVoteMessage, 8),
206
		  pull(renderThread(defaultOpts), wrapPage('#' + channelId)),
207
		  toPull(res, function (err) {
208
		      if (err) console.error('[viewer]', err)
209
		  })
210
	      )
211
	  })
212
      )
213
  }
214
215
  function serveId(req, res, id, ext, query) {
216
    var q = query ? qs.parse(query) : {}
217
    var includeRoot = !('noroot' in q)
218
    var base = q.base || conf.base
219
    var baseToken
220
    if (!base) {
221
      if (ext === 'js') base = baseToken = '__BASE_' + Math.random() + '_'
222
      else base = '/'
223
    }
224
    var opts = {
225
      base: base,
226
      base_token: baseToken,
227
      msg_base: q.msg_base || conf.msg_base || base,
228
      feed_base: q.feed_base || conf.feed_base || base,
229
      blob_base: q.blob_base || conf.blob_base || base,
230
      img_base: q.img_base || conf.img_base || base,
231
      emoji_base: q.emoji_base || conf.emoji_base || (base + 'emoji/'),
232
    }
233
    opts.marked = {
234
      gfm: true,
235
      mentions: true,
236
      tables: true,
237
      breaks: true,
238
      pedantic: false,
239
      sanitize: true,
240
      smartLists: true,
241
      smartypants: false,
242
      emoji: renderEmoji,
243
      renderer: new MdRenderer(opts)
244
    }
245
246
    var format = formatMsgs(id, ext, opts)
247
    if (format === null) return respond(res, 415, 'Invalid format')
248
249
    pull(
250
      sbot.links({dest: id, values: true, rel: 'root'}),
251
      includeRoot && prepend(getMsg, id),
252
      pull.unique('key'),
253
      pull.collect(function (err, links) {
254
        if (err) return respond(res, 500, err.stack || err)
255
        var etag = hash(sort.heads(links).concat(appHash, ext, qs))
256
        if (req.headers['if-none-match'] === etag) return respond(res, 304)
257
        res.writeHead(200, {
258
          'Content-Type': ctype(ext),
259
          'etag': etag
260
        })
261
        pull(
262
          pull.values(sort(links)),
263
          paramap(addAuthorAbout, 8),
264
          format,
265
          toPull(res, function (err) {
266
            if (err) console.error('[viewer]', err)
267
          })
268
        )
269
      })
270
    )
271
  }
272
273
  function addFollowAbout(msg, cb) {
274
      if (msg.value.content.contact)
275
	  getAbout(msg.value.content.contact, function (err, about) {
276
	      if (err) return cb(err)
277
	      msg.value.content.contactAbout = about
278
	      cb(null, msg)
279
	  })
280
      else
281
	  cb(null, msg)
282
  }
283
284
  function addVoteMessage(msg, cb) {
285
      if (msg.value.content.type == 'vote' && msg.value.content.vote.link[0] == '%')
286
	  getMsg(msg.value.content.vote.link, function (err, linkedMsg) {
287
	      if (linkedMsg)
288
		  msg.value.content.vote.linkedText = linkedMsg.value.content.text
289
	      cb(null, msg)
290
	  })
291
      else
292
	  cb(null, msg)
293
  }
294
295
  function addAuthorAbout(msg, cb) {
296
    getAbout(msg.value.author, function (err, about) {
297
      if (err) return cb(err)
298
      msg.author = about
299
      cb(null, msg)
300
    })
301
  }
302
303
  function addGitLinks(msg, cb) {
304
      if (msg.value.content.type == 'git-update')
305
	  getMsg(msg.value.content.repo, function (err, gitRepo) {
306
	      if (gitRepo)
307
		  msg.value.content.repoName = gitRepo.value.content.name
308
	      cb(null, msg)
309
	  })
310
      else if (msg.value.content.type == 'issue')
311
	  getMsg(msg.value.content.project, function (err, gitRepo) {
312
	      if (gitRepo)
313
		  msg.value.content.repoName = gitRepo.value.content.name
314
	      cb(null, msg)
315
	  })
316
      else
317
	  cb(null, msg)
318
  }
319
}
320
321
function serveBlob(req, res, sbot, id) {
322
  if (req.headers['if-none-match'] === id) return respond(res, 304)
323
  sbot.blobs.has(id, function (err, has) {
324
    if (err) {
325
      if (/^invalid/.test(err.message)) return respond(res, 400, err.message)
326
      else return respond(res, 500, err.message || err)
327
    }
328
    if (!has) return respond(res, 404, 'Not found')
329
    res.writeHead(200, {
330
      'Cache-Control': 'public, max-age=315360000',
331
      'etag': id
332
    })
333
    pull(
334
      sbot.blobs.get(id),
335
      toPull(res, function (err) {
336
        if (err) console.error('[viewer]', err)
337
      })
338
    )
339
  })
340
}
341
342
function getMsgWithValue(sbot, id, cb) {
343
  sbot.get(id, function (err, value) {
344
    if (err) return cb(err)
345
    cb(null, {key: id, value: value})
346
  })
347
}
348
349
function respond(res, status, message) {
350
  res.writeHead(status)
351
  res.end(message)
352
}
353
354
function ctype(name) {
355
  switch (name && /[^.\/]*$/.exec(name)[0] || 'html') {
356
    case 'html': return 'text/html'
357
    case 'js': return 'text/javascript'
358
    case 'css': return 'text/css'
359
    case 'json': return 'application/json'
360
  }
361
}
362
363
function servePath(req, res, url) {
364
  switch (url) {
365
    case '/robots.txt': return res.end('User-agent: *')
366
  }
367
  var m = /^(\/?[^\/]*)(\/.*)?$/.exec(url)
368
  switch (m[1]) {
369
    case '/static': return serveStatic(req, res, m[2])
370
    case '/emoji': return serveEmoji(req, res, m[2])
371
  }
372
  return respond(res, 404, 'Not found')
373
}
374
375
function ifModified(req, lastMod) {
376
  var ifModSince = req.headers['if-modified-since']
377
  if (!ifModSince) return false
378
  var d = new Date(ifModSince)
379
  return d && Math.floor(d/1000) >= Math.floor(lastMod/1000)
380
}
381
382
function serveStatic(req, res, file) {
383
  serveFile(req, res, path.join(__dirname, 'static', file))
384
}
385
386
function serveFile(req, res, file) {
387
  fs.stat(file, function (err, stat) {
388
    if (err && err.code === 'ENOENT') return respond(res, 404, 'Not found')
389
    if (err) return respond(res, 500, err.stack || err)
390
    if (!stat.isFile()) return respond(res, 403, 'May only load files')
391
    if (ifModified(req, stat.mtime)) return respond(res, 304, 'Not modified')
392
    res.writeHead(200, {
393
      'Content-Type': ctype(file),
394
      'Content-Length': stat.size,
395
      'Last-Modified': stat.mtime.toGMTString()
396
    })
397
    fs.createReadStream(file).pipe(res)
398
  })
399
}
400
401
function prepend(fn, arg) {
402
  return function (read) {
403
    return function (abort, cb) {
404
      if (fn && !abort) {
405
        var _fn = fn
406
        fn = null
407
        return _fn(arg, function (err, value) {
408
          if (err) return read(err, function (err) {
409
            cb(err || true)
410
          })
411
          cb(null, value)
412
        })
413
      }
414
      read(abort, cb)
415
    }
416
  }
417
}
418