package com.judong.chuanyiserver.util;

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

import java.util.Date;
import java.util.HashMap;
import java.util.Map;

public class TokenUtil {
    //设置过期时间
    // private static final long EXPIRE_DATE=30*60*100000;
    //token秘钥
    private static final String TOKEN_SECRET = "ZCfasfhuaUUHufguGuwu2020BQWE";

    public static String token(String username, Long expire) {

        String token = "";
        try {
            //过期时间
            Date date = new Date(System.currentTimeMillis() + expire * 1000);
            //秘钥及加密算法
            Algorithm algorithm = Algorithm.HMAC256(TOKEN_SECRET);
            //设置头部信息
            Map<String, Object> header = new HashMap<>();
            header.put("typ", "JWT");
            header.put("alg", "HS256");
            //携带username信息，生成签名
            token = JWT.create()
                    .withHeader(header)
                    .withClaim("username", username)
                    .withExpiresAt(date)
                    .sign(algorithm);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        return token;
    }

    /**
     * @desc 验证token，通过返回true
     * @params [token]需要校验的串
     **/
    public static boolean verify(String token) {
        try {
            Algorithm algorithm = Algorithm.HMAC256(TOKEN_SECRET);
            JWTVerifier verifier = JWT.require(algorithm).build();
            DecodedJWT jwt = verifier.verify(token);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    public static Claim parseJWT(String jwt) throws Exception {
        Claim claims = JWT.decode(jwt).getClaims().get("username");
        return claims;


    }

}
