/
reader.go
70 lines (59 loc) · 1.58 KB
/
reader.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
// Copyright 2019 The Mellium Contributors.
// Use of this source code is governed by the BSD 2-clause
// license that can be found in the LICENSE file.
package stream
import (
"encoding/xml"
"errors"
"io"
"mellium.im/xmpp/stream"
)
// Erorrs related to stream handling
var (
ErrUnknownStreamElement = errors.New("xmpp: unknown stream level element")
ErrUnexpectedRestart = errors.New("xmpp: unexpected stream restart")
)
type reader struct {
r xml.TokenReader
}
func (r reader) Token() (xml.Token, error) {
tok, err := r.r.Token()
if err != nil {
return nil, err
}
switch t := tok.(type) {
case xml.StartElement:
if t.Name.Space != stream.NS {
return tok, err
}
// Handle stream errors and unknown stream namespaced tokens first, before
// delegating to the normal handler.
switch t.Name.Local {
case "error":
// TODO: Unmarshal the error and return it.
return nil, stream.InternalServerError
case "stream":
// Special case returning a nice error here.
return nil, ErrUnexpectedRestart
default:
return nil, ErrUnknownStreamElement
}
case xml.EndElement:
if t.Name.Space != stream.NS {
return tok, err
}
// If this is a stream end element, we're done.
if t.Name.Local == "stream" {
return nil, io.EOF
}
// If this is a stream level end element but not </stream:stream>,
// something is really weird…
return nil, stream.BadFormat
}
return tok, err
}
// Reader returns a token reader that handles stream level tokens on an already
// established stream.
func Reader(r xml.TokenReader) xml.TokenReader {
return reader{r: r}
}