git ssb

1
var pull = require('pull-stream')
2
var sort = require('ssb-sort')
3
4
function asString(val) {
5
  return typeof val === 'string' && val
6
}
7
8
function linkDest(val) {
9
  return val ? asString(val) || asString(val.link) : null
10
}
11
12
function defalsify(val) {
13
  return val === 'false' ? false : val
14
}
15
16
module.exports = function (sbot, id, cb) {
17
  var aboutByFeed = {}
18
  pull(
19
    sbot.links({
20
      rel: 'about',
21
      dest: id,
22
      values: true,
23
    }), 
24
    pull.drain(function (msg) {
25
      var author = msg.value.author
26
      var c = msg.value.content
27
      if (!c) return
28
      var feedAbout = aboutByFeed[author] || (aboutByFeed[author] = {})
29
      if (typeof c.name == 'string') feedAbout.name = c.name.replace(/^@?/, '@')
30
      if (c.image) feedAbout.image = linkDest(c.image)
31
      if (c.description) feedAbout.description = c.description
32
      if (c.title) feedAbout.title = c.title
33
      if (c.startDateTime) feedAbout.startDateTime = c.startDateTime
34
      if (c.publicWebHosting != null && author === c.about) feedAbout.publicWebHosting = defalsify(c.publicWebHosting)
35
    }, function (err) {
36
      if (err) return cb(err)
37
      // Use whatever properties have the most counts.
38
      // Usually we would want to handle renames for dead feeds and such,
39
      // but for ssb-viewer it is mostly public/archival content anyway,
40
      // so we'll let the popular name stand.
41
      // Except: prefer the feed's own choices slightly
42
      var propValueCounts = {/* prop: {value: count} */}
43
      var topValues = {/* prop: value */}
44
      var topValueCounts = {/* prop: count */}
45
      var about = {}
46
      // bias the feed's own choice by 1
47
      aboutByFeed._author = aboutByFeed[id] || {}
48
      for (var feed in aboutByFeed) {
49
        var feedAbout = aboutByFeed[feed]
50
        for (var prop in feedAbout) {
51
          var value = feedAbout[prop]
52
          var valueCounts = propValueCounts[prop] || (propValueCounts[prop] = {})
53
          var count = (valueCounts[value] || 0) + 1
54
          valueCounts[value] = count
55
          if (count > (topValueCounts[prop] || 0)) {
56
            topValueCounts[prop] = count
57
            topValues[prop] = value
58
          }
59
        }
60
      }
61
      if (!topValues.name) topValues.name = String(id).substr(0, 10) + '…'
62
      cb(null, topValues)
63
    })
64
  )
65
}
66