/
jwt.go
78 lines (60 loc) · 1.53 KB
/
jwt.go
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package http
import (
"errors"
"net/http"
"strings"
"time"
"github.com/SermoDigital/jose/crypto"
"github.com/SermoDigital/jose/jws"
)
var hashAlg = crypto.SigningMethodHS256
const scopesClaim = "scopes"
type Scope string
var (
SkinScope = Scope("skin")
)
type JwtAuth struct {
Emitter
Key []byte
}
func (t *JwtAuth) NewToken(scopes ...Scope) ([]byte, error) {
if len(t.Key) == 0 {
return nil, errors.New("signing key not available")
}
claims := jws.Claims{}
claims.Set(scopesClaim, scopes)
claims.SetIssuedAt(time.Now())
encoder := jws.NewJWT(claims, hashAlg)
token, err := encoder.Serialize(t.Key)
if err != nil {
return nil, err
}
return token, nil
}
func (t *JwtAuth) Authenticate(req *http.Request) error {
if len(t.Key) == 0 {
return t.emitErr(errors.New("Signing key not set"))
}
bearerToken := req.Header.Get("Authorization")
if bearerToken == "" {
return t.emitErr(errors.New("Authentication header not presented"))
}
if !strings.EqualFold(bearerToken[0:7], "BEARER ") {
return t.emitErr(errors.New("Cannot recognize JWT token in passed value"))
}
tokenStr := bearerToken[7:]
token, err := jws.ParseJWT([]byte(tokenStr))
if err != nil {
return t.emitErr(errors.New("Cannot parse passed JWT token"))
}
err = token.Validate(t.Key, hashAlg)
if err != nil {
return t.emitErr(errors.New("JWT token have invalid signature. It may be corrupted or expired"))
}
t.Emit("authentication:success")
return nil
}
func (t *JwtAuth) emitErr(err error) error {
t.Emit("authentication:error", err)
return err
}