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