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/*
* Copyright 2018-2024 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, nil)
}
func (gc *GenericClaims) EncodeWithSigner(pair nkeys.KeyPair, fn SignFn) (string, error) {
return gc.ClaimsData.encode(pair, gc, fn)
}
// 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)
}
}
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