-
Notifications
You must be signed in to change notification settings - Fork 28
/
genericlaims.go
157 lines (137 loc) · 3.69 KB
/
genericlaims.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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
/*
* Copyright 2018-2020 The NATS Authors
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jwt
import (
"encoding/json"
"errors"
"strings"
"github.com/nats-io/nkeys"
)
// GenericClaims can be used to read a JWT as a map for any non-generic fields
type GenericClaims struct {
ClaimsData
Data map[string]interface{} `json:"nats,omitempty"`
}
// NewGenericClaims creates a map-based Claims
func NewGenericClaims(subject string) *GenericClaims {
if subject == "" {
return nil
}
c := GenericClaims{}
c.Subject = subject
c.Data = make(map[string]interface{})
return &c
}
// DecodeGeneric takes a JWT string and decodes it into a ClaimsData and map
func DecodeGeneric(token string) (*GenericClaims, error) {
// must have 3 chunks
chunks := strings.Split(token, ".")
if len(chunks) != 3 {
return nil, errors.New("expected 3 chunks")
}
// header
header, err := parseHeaders(chunks[0])
if err != nil {
return nil, err
}
// claim
data, err := decodeString(chunks[1])
if err != nil {
return nil, err
}
gc := struct {
GenericClaims
GenericFields
}{}
if err := json.Unmarshal(data, &gc); err != nil {
return nil, err
}
// sig
sig, err := decodeString(chunks[2])
if err != nil {
return nil, err
}
if header.Algorithm == AlgorithmNkeyOld {
if !gc.verify(chunks[1], sig) {
return nil, errors.New("claim failed V1 signature verification")
}
if tp := gc.GenericFields.Type; tp != "" {
// the conversion needs to be from a string because
// on custom types the type is not going to be one of
// the constants
gc.GenericClaims.Data["type"] = string(tp)
}
if tp := gc.GenericFields.Tags; len(tp) != 0 {
gc.GenericClaims.Data["tags"] = tp
}
} else {
if !gc.verify(token[:len(chunks[0])+len(chunks[1])+1], sig) {
return nil, errors.New("claim failed V2 signature verification")
}
}
return &gc.GenericClaims, nil
}
// Claims returns the standard part of the generic claim
func (gc *GenericClaims) Claims() *ClaimsData {
return &gc.ClaimsData
}
// Payload returns the custom part of the claims data
func (gc *GenericClaims) Payload() interface{} {
return &gc.Data
}
// Encode takes a generic claims and creates a JWT string
func (gc *GenericClaims) Encode(pair nkeys.KeyPair) (string, error) {
return gc.ClaimsData.encode(pair, gc)
}
// Validate checks the generic part of the claims data
func (gc *GenericClaims) Validate(vr *ValidationResults) {
gc.ClaimsData.Validate(vr)
}
func (gc *GenericClaims) String() string {
return gc.ClaimsData.String(gc)
}
// ExpectedPrefixes returns the types allowed to encode a generic JWT, which is nil for all
func (gc *GenericClaims) ExpectedPrefixes() []nkeys.PrefixByte {
return nil
}
func (gc *GenericClaims) ClaimType() ClaimType {
v, ok := gc.Data["type"]
if !ok {
v, ok = gc.Data["nats"]
if ok {
m, ok := v.(map[string]interface{})
if ok {
v = m["type"]
}
}
}
switch ct := v.(type) {
case string:
if IsGenericClaimType(ct) {
return GenericClaim
}
return ClaimType(ct)
case ClaimType:
return ct
default:
return ""
}
}
func (gc *GenericClaims) updateVersion() {
if gc.Data != nil {
// store as float as that is what decoding with json does too
gc.Data["version"] = float64(libVersion)
}
}