package com.atguigu.ssyx.common.utils;

import io.jsonwebtoken.*;
import org.springframework.util.StringUtils;

import java.util.Date;

/**
 * ClassName: JwtHelper
 * Package: com.atguigu.ssyx.common.utils
 *
 * @author yovinchen
 * @Create 2023/9/22 15:50
 */
public class JwtHelper {

    private static final long tokenExpiration = 365L * 24 * 60 * 60 * 1000;
    private static final String tokenSignKey = "ssyx";

    public static String createToken(Long userId, String userName) {
        String token = Jwts.builder()
                           .setSubject("ssyx-USER")
                           .setExpiration(new Date(System.currentTimeMillis() + tokenExpiration))
                           .claim("userId", userId)
                           .claim("userName", userName)
                           .signWith(SignatureAlgorithm.HS512, tokenSignKey)
                           .compressWith(CompressionCodecs.GZIP)
                           .compact();
        return token;
    }

    public static Long getUserId(String token) {
        if (StringUtils.isEmpty(token)) return null;

        Jws<Claims> claimsJws = Jwts.parser()
                                    .setSigningKey(tokenSignKey)
                                    .parseClaimsJws(token);
        Claims claims = claimsJws.getBody();
        Integer userId = (Integer) claims.get("userId");
        return userId.longValue();
        // return 1L;
    }

    public static String getUserName(String token) {
        if (StringUtils.isEmpty(token)) return "";

        Jws<Claims> claimsJws = Jwts.parser()
                                    .setSigningKey(tokenSignKey)
                                    .parseClaimsJws(token);
        Claims claims = claimsJws.getBody();
        return (String) claims.get("userName");
    }

    public static void removeToken(String token) {
        //jwttoken无需删除，客户端扔掉即可。
    }

    public static void main(String[] args) {
        String token = JwtHelper.createToken(7L, "admin");
        System.out.println(token);
        System.out.println(JwtHelper.getUserId(token));
        System.out.println(JwtHelper.getUserName(token));
    }
}
