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
71
72
73
74
75
76
77
78
79
80
81
|
package request
import (
"errors"
"net/http"
)
// Errors
var (
ErrNoTokenInRequest = errors.New("no token present in request")
)
// Interface for extracting a token from an HTTP request.
// The ExtractToken method should return a token string or an error.
// If no token is present, you must return ErrNoTokenInRequest.
type Extractor interface {
ExtractToken(*http.Request) (string, error)
}
// Extractor for finding a token in a header. Looks at each specified
// header in order until there's a match
type HeaderExtractor []string
func (e HeaderExtractor) ExtractToken(req *http.Request) (string, error) {
// loop over header names and return the first one that contains data
for _, header := range e {
if ah := req.Header.Get(header); ah != "" {
return ah, nil
}
}
return "", ErrNoTokenInRequest
}
// Extract token from request arguments. This includes a POSTed form or
// GET URL arguments. Argument names are tried in order until there's a match.
// This extractor calls `ParseMultipartForm` on the request
type ArgumentExtractor []string
func (e ArgumentExtractor) ExtractToken(req *http.Request) (string, error) {
// Make sure form is parsed
req.ParseMultipartForm(10e6)
// loop over arg names and return the first one that contains data
for _, arg := range e {
if ah := req.Form.Get(arg); ah != "" {
return ah, nil
}
}
return "", ErrNoTokenInRequest
}
// Tries Extractors in order until one returns a token string or an error occurs
type MultiExtractor []Extractor
func (e MultiExtractor) ExtractToken(req *http.Request) (string, error) {
// loop over header names and return the first one that contains data
for _, extractor := range e {
if tok, err := extractor.ExtractToken(req); tok != "" {
return tok, nil
} else if err != ErrNoTokenInRequest {
return "", err
}
}
return "", ErrNoTokenInRequest
}
// Wrap an Extractor in this to post-process the value before it's handed off.
// See AuthorizationHeaderExtractor for an example
type PostExtractionFilter struct {
Extractor
Filter func(string) (string, error)
}
func (e *PostExtractionFilter) ExtractToken(req *http.Request) (string, error) {
if tok, err := e.Extractor.ExtractToken(req); tok != "" {
return e.Filter(tok)
} else {
return "", err
}
}
|
