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jwt.go
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jwt.go
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package pitchfork
/* JWT helpers between Pitchfork and dgrijalva's JWT library */
import (
"errors"
"fmt"
jwt "github.com/dgrijalva/jwt-go"
"io/ioutil"
"time"
)
/* Default Token expiration time */
const TOKEN_EXPIRATIONMINUTES = 20
type Token struct {
*jwt.Token
}
func (tok *Token) GetClaims() JWTClaimI {
return tok.Token.Claims.(JWTClaimI)
}
type JWTClaimI interface {
jwt.Claims
GetJWTClaims() *JWTClaims
}
type JWTClaims struct {
jwt.StandardClaims
}
func (jwtc *JWTClaims) GetJWTClaims() *JWTClaims {
return jwtc
}
func Token_New(ttype string, username string, expmins time.Duration, claims JWTClaimI) (token *Token) {
now := time.Now()
jwtc := claims.GetJWTClaims()
jwtc.Audience = ttype
jwtc.Subject = username
jwtc.IssuedAt = now.Unix()
jwtc.ExpiresAt = now.Add(time.Minute * expmins).Unix()
jwtc.Issuer = AppName
jtoken := jwt.NewWithClaims(jwt.SigningMethodES512, claims)
token = &Token{jtoken}
return
}
func (token *Token) Sign() (tok string, err error) {
tok, err = token.SignedString(Config.Token_prv)
return
}
func Token_Parse(tok string, ttype string, claims JWTClaimI) (expsoon bool, err error) {
expsoon = false
jtoken, err := jwt.ParseWithClaims(tok, claims, func(token *jwt.Token) (interface{}, error) {
// Don't forget to validate the alg is what you expect:
if _, ok := token.Method.(*jwt.SigningMethodECDSA); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
return Config.Token_pub, nil
})
if err != nil || jtoken == nil || !jtoken.Valid {
var ve *jwt.ValidationError
ok := false
if err != nil {
ve, ok = err.(*jwt.ValidationError)
}
if ok {
if ve.Errors&jwt.ValidationErrorMalformed != 0 {
err = errors.New("Token does not even look like a token")
} else if ve.Errors&jwt.ValidationErrorNotValidYet != 0 {
err = errors.New("Token not active yet")
} else if ve.Errors&jwt.ValidationErrorExpired != 0 {
err = errors.New("Token expired")
} else {
err = errors.New("Token unhandled")
}
} else {
err = errors.New("Token is invalid")
}
return
}
if Jwt_isinvalidated(tok, claims) {
err = errors.New("Token is invalid")
return
}
jwtc := claims.GetJWTClaims()
/* Avoid type checking */
if ttype == "" {
/* Check that it is the right type of token */
if jwtc.Audience != ttype {
err = errors.New("Token is not a ttype token")
return
}
}
/* Is it going to expire soon? */
then := time.Now().Add(time.Minute * 10).Unix()
if then > jwtc.ExpiresAt {
/* Expiring soon, requires refresh of Token */
expsoon = true
}
return
}
func (cfg *PfConfig) Token_LoadPrv() (err error) {
var pem []byte
fn := Config.Conf_root + Config.JWT_prv
pem, err = ioutil.ReadFile(fn)
if err != nil {
err = errors.New("Could not load JWT Private Key from " + fn + ": " + err.Error())
return
}
/* Parse it */
cfg.Token_prv, err = jwt.ParseECPrivateKeyFromPEM(pem)
if err != nil {
err = errors.New("Could not Parse JWT Private Key from " + fn + ": " + err.Error())
return
}
return
}
func (cfg *PfConfig) Token_LoadPub() (err error) {
var pem []byte
fn := Config.Conf_root + Config.JWT_pub
pem, err = ioutil.ReadFile(fn)
if err != nil {
err = errors.New("Could not load JWT Public Key from " + fn + ": " + err.Error())
return
}
/* Parse it */
cfg.Token_pub, err = jwt.ParseECPublicKeyFromPEM(pem)
if err != nil {
err = errors.New("Could not Parse JWT Public Key from " + fn + ": " + err.Error())
return
}
return
}