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jwt.go
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jwt.go
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// Copyright 2016 Mender Software AS
//
// 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 main
import (
"crypto/rsa"
jwt "github.com/dgrijalva/jwt-go"
"github.com/mendersoftware/go-lib-micro/log"
"github.com/pkg/errors"
)
var (
ErrTokenExpired = errors.New("jwt: token expired")
ErrTokenInvalid = errors.New("jwt: token invalid")
)
// JWTHandler jwt generator/verifier
type JWTHandler interface {
ToJWT(t *Token) (string, error)
FromJWT(string) (*Token, error)
WithLog(l *log.Logger) JWTHandler
log.ContextLogger
}
// JWTHandlerRS256 is an RS256-specific JWTHandler
type JWTHandlerRS256 struct {
privKey *rsa.PrivateKey
log *log.Logger
}
func NewJWTHandlerRS256(privKey *rsa.PrivateKey, l *log.Logger) *JWTHandlerRS256 {
if l == nil {
l = log.New(log.Ctx{})
}
return &JWTHandlerRS256{
privKey: privKey,
log: l,
}
}
func (j *JWTHandlerRS256) ToJWT(token *Token) (string, error) {
//generate
jt := jwt.NewWithClaims(jwt.SigningMethodRS256, &token.Claims)
//sign
data, err := jt.SignedString(j.privKey)
return data, err
}
func (j *JWTHandlerRS256) FromJWT(tokstr string) (*Token, error) {
jwttoken, err := jwt.ParseWithClaims(tokstr, &Claims{}, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodRSA); !ok {
return nil, errors.New("unexpected signing method: " + token.Method.Alg())
}
return &j.privKey.PublicKey, nil
})
if err != nil {
if vErr, ok := err.(*jwt.ValidationError); ok {
if (vErr.Errors & jwt.ValidationErrorExpired) != 0 {
return nil, ErrTokenExpired
}
}
return nil, ErrTokenInvalid
}
token := Token{}
if claims, ok := jwttoken.Claims.(*Claims); ok && jwttoken.Valid {
token.Claims = *claims
return &token, nil
} else {
return nil, ErrTokenInvalid
}
}
func (j *JWTHandlerRS256) WithLog(l *log.Logger) JWTHandler {
return &JWTHandlerRS256{
privKey: j.privKey,
log: l,
}
}
func (j *JWTHandlerRS256) UseLog(l *log.Logger) {
j.log = l.F(log.Ctx{})
}