import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.interfaces.DecodedJWT;

import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Date;

class Scratch {

    static String createToken() {
        try {
            Algorithm algorithm = Algorithm.HMAC256("bO4Tbmfhkztt5Ew6hcpZ_jHj56DT4-0SRIKRUYxwYF");
            Date expireDate = Date.from(LocalDateTime.now().plusDays(1)
                    .atZone(ZoneId.systemDefault()).toInstant());
            return JWT.create()
                    .withIssuer("gms")
                    .withExpiresAt(expireDate)
                    .withClaim("userId", "20xxxxx")
                    .withClaim("loginId", "sampleuser")
                    .sign(algorithm);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    static void verify(String token) {
        Algorithm algorithm = Algorithm.HMAC256("bO4Tbmfhkztt5Ew6hcpZ_jHj56DT4-0SRIKRUYxwYF");
        JWTVerifier verifier = JWT.require(algorithm)
                .withIssuer("gms")
//                 .acceptExpiresAt(60 * 60 * 24) // expire 1일전부터만 유효
                .build();

        DecodedJWT decodedJWT = verifier.verify(token);
        System.out.println(decodedJWT);
        System.out.println("userId -> " + decodedJWT.getClaim("userId").asString());
    }

    public static void main(String[] args) {
        String token = createToken();
        System.out.println(token);

        verify(token);
    }
}