Golang JWT and intervals (using goroutines and channels)

jwt_interval.go

package main

import (
	"fmt"
	"time"

	"github.com/golang-jwt/jwt"
)

func main() {
	access_token, _ := GenerateToken("test", time.Second*2, "secret")
	ch, clearInterval := Interval(time.Second * 1)
	for range ch {
		jwt, err := ExtractTokenData(access_token, "secret")
		if err != nil {
			fmt.Println(err)
			fmt.Printf("%+v\n", jwt.Subject)
			clearInterval()
		} else {
			fmt.Println(jwt.Subject)
		}
		fmt.Println("------------------")
	}
}

func Interval(d time.Duration) (chan bool, func()) {
	ch := make(chan bool)
	quit := make(chan bool)
	cancel := func() { quit <- true }
	go func() {
		for {
			time.Sleep(d)
			select {
			case ch <- true:
			case <-quit:
				close(ch)
			}
		}
	}()
	return ch, cancel
}

func GenerateToken(subject string, lifespan time.Duration, secret string) (string, error) {
	payload := jwt.StandardClaims{
		Subject:   subject,
		ExpiresAt: time.Now().Add(lifespan).Unix(),
	}
	token := jwt.NewWithClaims(jwt.SigningMethodHS256, payload)
	return token.SignedString([]byte(secret))
}

func ExtractTokenData(token string, secret string) (*jwt.StandardClaims, error) {
	jwt_token, err := jwt.ParseWithClaims(
		token, &jwt.StandardClaims{},
		func(t *jwt.Token) (interface{}, error) {
			return []byte(secret), nil
		},
	)
	payload := jwt_token.Claims.(*jwt.StandardClaims)
	fmt.Println("is valid: ", jwt_token.Valid)
	if err != nil {
		return payload, err
	} else if !jwt_token.Valid {
		return payload, fmt.Errorf("invalid token")
	}
	return payload, nil
}