How do I know if the token is expired or other errors?

[push-and-pop]

func ParseToken(token string) (*TokenClaim, error) {
	jwtToken, err := jwt.ParseWithClaims(token, &TokenClaim{}, func(t *jwt.Token) (interface{}, error) {

		return secret, nil
	})
	fmt.Println(err.Error())
	if err != nil {
		return nil, err
	}

	if claims, ok := jwtToken.Claims.(*TokenClaim); ok && jwtToken.Valid {
		return claims, nil
	} else {
		return nil, err
	}

}

I have a requirement, if it is expired, I want to return a new token, other errors will continue to make mistakes

[push-and-pop]

please A help

[2yuri]

jwtToken.Valid return if token is valid or not

[oxisto]

You need to access our specific error type ValidationError and then can access the bit mask to get the type of error. We are working to improve this. The first step is to support error unwrapping with #125 but this does not work consistently for all claims yet. So you need to do the following, if err is the error you get from Parse or ParseWithClaims.

var ve *jwt.ValidationError
if errors.As(err, &ve) {
	if ve.Errors&jwt.ValidationErrorExpired != 0 {
		// Token is either expired or not active yet
		fmt.Println("Timing is everything")
	}
}

Similar code can be found in the error checking example

jwt/example_test.go

Lines 96 to 119 in c435f38

	func ExampleParse_errorChecking() {
	// Token from another example. This token is expired
	var tokenString = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIiLCJleHAiOjE1MDAwLCJpc3MiOiJ0ZXN0In0.HE7fK0xOQwFEr4WDgRWj4teRPZ6i3GLwD5YCm6Pwu_c"
	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
	return []byte("AllYourBase"), nil
	})
	if token.Valid {
	fmt.Println("You look nice today")
	} else if ve, ok := err.(*jwt.ValidationError); ok {
	if ve.Errors&jwt.ValidationErrorMalformed != 0 {
	fmt.Println("That's not even a token")
	} else if ve.Errors&(jwt.ValidationErrorExpired|jwt.ValidationErrorNotValidYet) != 0 {
	// Token is either expired or not active yet
	fmt.Println("Timing is everything")
	} else {
	fmt.Println("Couldn't handle this token:", err)
	}
	} else {
	fmt.Println("Couldn't handle this token:", err)
	}
	// Output: Timing is everything

(which we should update to support Go 1.13 error styles)