git ssb

1
/* ssb-about
2
 * factored out of ssb-notifier
3
 *
4
 * TODO:
5
 * - publish as own module
6
 * - handle live updates and reconnecting
7
 * - deprecate when ssb-names is used in scuttlebot
8
 */
9
10
var pull = require('pull-stream')
11
var cat = require('pull-cat')
12
var asyncMemo = require('asyncmemo')
13
14
module.exports = function (sbot, id) {
15
  var getAbout = asyncMemo(getAboutFull, sbot, id)
16
17
  getAbout.getName = function (id, cb) {
18
    getAbout(id, function (err, about) {
19
      cb(err, about && about.name)
20
    })
21
  }
22
23
  getAbout.getImage = function (id, cb) {
24
    getAbout(id, function (err, about) {
25
      cb(err, about && about.image)
26
    })
27
  }
28
29
  return getAbout
30
}
31
32
function truncate(str, len) {
33
  str = String(str)
34
  return str.length < len ? str : str.substr(0, len-1) + '…'
35
}
36
37
// Get About info (name and icon) for a feed.
38
function getAboutFull(sbot, source, dest, cb) {
39
  var name, image
40
  pull(
41
    cat([
42
      // First get About info that we gave them.
43
      sbot.links({
44
        source: source,
45
        dest: dest,
46
        rel: 'about',
47
        values: true,
48
        reverse: true
49
      }),
50
      // If that isn't enough, then get About info that they gave themselves.
51
      sbot.links({
52
        source: dest,
53
        dest: dest,
54
        rel: 'about',
55
        values: true,
56
        reverse: true
57
      }),
58
    ]),
59
    pull.filter(function (msg) {
60
      return msg && msg.value.content && (!name || !image)
61
    }),
62
    pull.drain(function (msg) {
63
      var c = msg.value.content
64
      if (!name) {
65
        name = c.name
66
      }
67
      if (!image) {
68
        image = c.image ? c.image.link : c.image
69
        // var imgLink = mlib.link(c.image, 'blob')
70
        // image = imgLink && imgLink.link
71
      }
72
    }, function (err) {
73
      if (err) return cb(err)
74
      cb(null, {name: name || truncate(id, 8), image: image})
75
    })
76
  )
77
}
78