package com.huimv.common.utils;


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

import java.util.Date;

/**
 * @Project : huimv.shiwan
 * @Package : com.example.demo.util
 * @Description : TODO
 * @Author : yuxuexuan
 * @Create : 2021/2/26 0026 9:06
 **/
public class TokenUtil {

    private static final long EXPIRE_TIME = 2*60*60*1000;  //有效时长
    private static final String TOKEN_SECRET = "ben";       // 秘钥

    /**
     * 签名 生成
     * @parm userName
     * */
    public static String sign(String userName){
        String token = null;
        try {
            Date expiresAt = new Date(System.currentTimeMillis()+EXPIRE_TIME);
            token = JWT.create()
                    .withIssuer("auth0")
                    .withClaim("userName",userName)
                    .withExpiresAt(expiresAt)
                    //使用HMAC256算法加密
                    .sign(Algorithm.HMAC256(TOKEN_SECRET));
        }catch (Exception e){
            e.printStackTrace();
        }
        return token;
    }

    /**
     * 签名验证
     * @param token
     * */
    public static boolean verify(String token){
        try {
            JWTVerifier verifier = JWT.require(Algorithm.HMAC256(TOKEN_SECRET))
                    .withIssuer("auth0").build();
            DecodedJWT jwt = verifier.verify(token);
            System.out.println("认证通过");
//            System.out.println("userName:"+jwt.getClaims().toString());
            System.out.println("过期时间："+jwt.getExpiresAt());
            return true;
        }catch (Exception e){
            return false;
        }
    }
}