git ssb

1
var ref = require('ssb-ref')
2
var caps = {invite: require('./cap')}
3
var ssbKeys = require('ssb-keys')
4
var createIsBase64 = require('is-canonical-base64')
5
6
function isObject (o) {
7
  return o && 'object' === typeof o
8
}
9
10
// signatures have a type (eg `.ed25519`) at the end,
11
// but not gonna check it right here.
12
var signature_rx = createIsBase64('', '\\.sig\\.\\w+')
13
var box_rx = createIsBase64()
14
15
function isSignature(b) {
16
  return signature_rx.test(b)
17
}
18
19
function isMaybeBase64(b) {
20
  return b === undefined || box_rx.test(b)
21
}
22
23
exports.isInvite = function (msg) {
24
  //return true
25
  return isObject(msg) && isObject(msg.content) && (
26
    'user-invite' === msg.content.type &&
27
    ref.isFeed(msg.content.host) &&
28
    ref.isFeed(msg.content.invite) &&
29
    isMaybeBase64(msg.content.reveal) &&
30
    isMaybeBase64(msg.content.public) &&
31
    // signature must be valid !!!
32
    ssbKeys.verifyObj(msg.content.invite, caps.invite, msg.content)
33
  )
34
}
35
36
exports.isAccept = function (msg) {
37
  return isObject(msg) && isObject(msg.content) && (
38
    'user-invite/accept' === msg.content.type &&
39
    msg.content.id == msg.author &&
40
    ref.isMsg(msg.content.receipt) &&
41
    isMaybeBase64(msg.content.key) &&
42
    // can't verify this without having the invite message.
43
    // (that's intentional, forces implementers not to cut corners,
44
    // but to check that the receipt is correct)
45
    isSignature(msg.content.signature)
46
  )
47
}
48
49
exports.isConfirm = function (msg) {
50
  return isObject(msg) && isObject(msg.content) && (
51
    'user-invite/confirm' === msg.content.type &&
52
    exports.isAccept(msg.content.embed)
53
  )
54
}
55
56
57
58
59
60
61
62