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token.go
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token.go
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/**
* Copyright 2022 IBM Corp.
*
* 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 token
import (
"errors"
"time"
"github.com/IBM/secret-utils-lib/pkg/utils"
"github.com/golang-jwt/jwt"
)
// CheckTokenLifeTime checks whether the lifetime of token is valid or not
// and returns life time of the token
func CheckTokenLifeTime(tokenString string) (uint64, error) {
var tokenLifeTime uint64
token, err := parseToken(tokenString)
if err != nil {
return tokenLifeTime, err
}
if claims, ok := token.Claims.(jwt.MapClaims); ok {
if err := claims.Valid(); err != nil {
return tokenLifeTime, err
}
currentTime := time.Now().Unix()
var expiryTime interface{}
if expiryTime, ok = claims["exp"]; !ok {
return tokenLifeTime, errors.New("unable to find expiry time of token")
}
tokenLifeTime = uint64(expiryTime.(float64)) - uint64(currentTime)
if tokenLifeTime < utils.TokenExpirydiff {
return tokenLifeTime, errors.New("token life time is less than expected value")
}
return tokenLifeTime, nil
}
return tokenLifeTime, errors.New("unable to fetch token claims")
}
// parseToken parses token string to jwt token
func parseToken(tokenString string) (*jwt.Token, error) {
if tokenString == "" {
return nil, errors.New("empty token string")
}
token, _, err := new(jwt.Parser).ParseUnverified(tokenString, jwt.MapClaims{})
return token, err
}