package com.cl.service.impl;


import com.cl.util.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;

import java.util.Collections;

import java.util.Date;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;


@Service
@Slf4j
public class TokenBlacklistService {
    // 使用ConcurrentHashMap或Redis存储黑名单
    private final Set<String> blacklist = Collections.newSetFromMap(new ConcurrentHashMap<>());

    public void addToBlacklist(String token) {
        blacklist.add(token);
    }

    public boolean isBlacklisted(String token) {
        return blacklist.contains(token);
    }


    /**
     * 定时清理过期令牌（每2小时执行一次）
     */
    @Scheduled(fixedRate = 2, timeUnit = TimeUnit.HOURS)
    public void cleanupExpiredTokens() {
        log.info("开始清理过期token");
        blacklist.removeIf(this::isTokenExpired);
    }
    /**
     * 检查JWT Token是否过期
     * @param token JWT Token字符串
     * @return true-已过期，false-未过期
     */
    public boolean isTokenExpired(String token) {
        try {
            Claims claims = JwtUtil.parseJWT(token);
            return claims.getExpiration().before(new Date());
        } catch (Exception e) {
            // 如果解析过程中出现异常（如Token无效、已过期等），视为已过期
            return true;
        }
    }
}