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token.go
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token.go
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// Copyright 2018-2020 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package manager
import (
"time"
"github.com/golang-jwt/jwt"
"github.com/pkg/errors"
"github.com/sethvargo/go-password/password"
)
type userToken struct {
jwt.StandardClaims
User string `json:"user"`
Scope string `json:"scope"`
}
const (
tokenKeyLength = 16
tokenIssuer = "sciencemesh_siteacc"
)
var (
tokenSecret string
)
func generateUserToken(user string, scope string, timeout int) (string, error) {
// Create a JWT as the user token
claims := userToken{
StandardClaims: jwt.StandardClaims{
ExpiresAt: time.Now().Add(time.Duration(timeout) * time.Second).Unix(),
Issuer: tokenIssuer,
IssuedAt: time.Now().Unix(),
},
User: user,
Scope: scope,
}
token := jwt.NewWithClaims(jwt.GetSigningMethod("HS256"), claims)
signedToken, err := token.SignedString([]byte(tokenSecret))
if err != nil {
return "", errors.Wrapf(err, "error signing token with claims %+v", claims)
}
return signedToken, nil
}
func extractUserToken(token string) (*userToken, error) {
// Parse the token and try to extract the claims
parsedToken, err := jwt.ParseWithClaims(token, &userToken{}, func(token *jwt.Token) (interface{}, error) { return []byte(tokenSecret), nil })
if err != nil {
return nil, errors.Wrap(err, "error parsing token")
}
if claims, ok := parsedToken.Claims.(*userToken); ok && parsedToken.Valid {
if claims.Issuer != tokenIssuer {
return nil, errors.Errorf("invalid token issuer")
}
return claims, nil
}
return nil, errors.Errorf("invalid token")
}
func init() {
// Generate the token secret randomly
tokenSecret = password.MustGenerate(tokenKeyLength, tokenKeyLength/4, tokenKeyLength/4, false, true)
}