-
Notifications
You must be signed in to change notification settings - Fork 0
/
typeis.go
108 lines (102 loc) · 2.14 KB
/
typeis.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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
package slim
import (
"fmt"
"mime"
"strings"
)
type ctype struct {
typ string
sub string
}
func (c *ctype) is(typ, sub string) bool {
if c.typ != typ {
return false
}
if sub != c.sub {
return sub == "*"
}
return true
}
// multipart/form-data; boundary=----WebKitFormBoundaryaCNSUNoouK7Epo6s
// application/json; charset=UTF-8
func parseContentType(s string) (*ctype, error) {
rangeParams := strings.Split(s, ";")
typeSubtype := strings.Split(rangeParams[0], "/")
// typeSubtype should have a length of exactly two.
if len(typeSubtype) > 2 {
return nil, fmt.Errorf("slim: invalid content type '%s'", s)
} else {
typeSubtype = append(typeSubtype, "*")
}
// Sanitize typeSubtype.
main := strings.TrimSpace(typeSubtype[0])
sub := strings.TrimSpace(typeSubtype[1])
if main == "" {
return nil, fmt.Errorf("slim: invalid content type '%s'", s)
} else {
main = strings.ToLower(strings.TrimSpace(main))
}
if sub == "" {
sub = "*"
} else {
sub = strings.ToLower(strings.TrimSpace(sub))
}
return &ctype{main, sub}, nil
}
func typeis(value string, types ...string) (string, error) {
cty, err := parseContentType(value)
if err != nil {
return "", err
}
if cty.sub == "*" {
return "", fmt.Errorf("slim: invalid content type '%s'", value)
}
for _, typ := range types {
s := typ
switch typ {
case "jsonp":
if cty.is("application", "javascript") {
return typ, nil
}
case "xml":
if cty.is("application", "xml") {
return typ, nil
}
if cty.is("text", "xml") {
return typ, nil
}
case "form":
if cty.is("multipart", "form-data") {
return typ, nil
}
if cty.is("application", "x-www-form-urlencoded") {
return typ, nil
}
case "protobuf", "msgpack":
if cty.is("application", typ) {
return typ, nil
}
case "text", "string":
if cty.is("text", "plain") {
return typ, nil
}
default:
if !strings.Contains(typ, "/") {
value := mime.TypeByExtension("." + typ)
if value != "" {
s = value
} else {
continue
}
}
}
x, ex := parseContentType(s)
if ex != nil {
continue
}
if cty.is(x.typ, x.sub) {
return typ, nil
}
}
return "", nil
}