}
	}

	return nil, jwtgo.NewValidationError(fmt.Sprintf("signing method (%s) is unavailable.", string(alg)),
		jwtgo.ValidationErrorUnverifiable)
}

// ParseWithClaims - parse the token string, valid methods.
func ParseWithClaims(tokenStr string, claims *MapClaims, fn func(*MapClaims) ([]byte, error)) error {
	// Key lookup function has to be provided.
	if fn == nil {
		// keyFunc was not provided, return error.

		return nil, errors.New("invalid argument")
	}

	claims := jwt.NewMapClaims()
	stsTokenCallback := func(claims *jwt.MapClaims) ([]byte, error) {
		return []byte(secretKey), nil
	}

	if err := jwt.ParseWithClaims(token, claims, stsTokenCallback); err != nil {
		return nil, err
	}

	return claims, nil
}

// GetNewCredentials generates and returns new credential.