package com.gkhy.exam.framework.web.service;
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import cn.hutool.crypto.digest.DigestUtil;
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import com.gkhy.exam.common.constant.CacheConstant;
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import com.gkhy.exam.common.domain.model.LoginUser;
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import com.gkhy.exam.common.exception.ApiException;
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import com.gkhy.exam.common.utils.RedisUtils;
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import com.gkhy.exam.common.utils.StringUtils;
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import io.jsonwebtoken.Claims;
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import io.jsonwebtoken.Jwts;
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import io.jsonwebtoken.SignatureAlgorithm;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.security.core.userdetails.UserDetails;
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import org.springframework.stereotype.Component;
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import javax.servlet.http.HttpServletRequest;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.concurrent.TimeUnit;
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@Slf4j
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@Component
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public class TokenService {
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//令牌自定义标识
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public static final String HEADER="Authorization";
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//令牌密钥
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public static final String SECRET="gkhy123456@";
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public static final String CLAIM_KEY_USERNAME = "sub";
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//令牌有效期
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public static final long EXPIRATION=12 * 60 * 60; //JWT的超期限时间(60*60*12)s
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protected static final long MILLIS_SECOND = 1000L;
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protected static final long MILLIS_MINUTE = 60 * MILLIS_SECOND;
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private static final Long MILLIS_MINUTE_TEN = 20 * MILLIS_MINUTE;
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@Autowired
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private RedisUtils redisUtils;
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public LoginUser getLoginUser(HttpServletRequest request){
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String token=getToken(request);
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if(!StringUtils.isBlank(token)){
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try
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{
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// 解析对应的权限以及用户信息
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String tagUsername = getUserNameFromToken(token);
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if(StringUtils.isBlank(tagUsername)){
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return null;
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}
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String userKey = getTokenKey(tagUsername.substring(0,tagUsername.lastIndexOf("_")));
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LoginUser user = (LoginUser) redisUtils.get(userKey);
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return user;
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}
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catch (Exception e)
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{
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log.error("获取用户信息异常'{}'", e.getMessage());
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}
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}
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return null;
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}
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/**
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* 删除用户身份信息
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*/
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public void delLoginUser(String username) {
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if (StringUtils.isNotEmpty(username))
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{
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String userKey = getTokenKey(username);
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redisUtils.del(userKey);
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}
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}
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/**
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* 创建令牌
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*
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* @param username 用户信息
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* @return 令牌
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*/
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public String createToken(String username) {
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Map<String, Object> claims = new HashMap<>();
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claims.put(CLAIM_KEY_USERNAME, username);
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return createToken(claims);
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}
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public String createToken(Map<String, Object> claims){
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return Jwts.builder()
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.setClaims(claims)
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.setExpiration(generateExpirationDate())
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.signWith(SignatureAlgorithm.HS512, SECRET)
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.compact();
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}
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/**
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* 从token中获取JWT中的负载
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*/
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private Claims getClaimsFromToken(String token) {
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Claims claims = null;
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try {
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claims = Jwts.parser()
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.setSigningKey(SECRET)
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.parseClaimsJws(token)
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.getBody();
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} catch (Exception e) {
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log.error("JWT格式验证失败:{}", token);
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}
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return claims;
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}
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/**
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* 从token中获取登录用户名
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*/
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public String getUserNameFromToken(String token) {
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String username;
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try {
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Claims claims = getClaimsFromToken(token);
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username = claims.getSubject();
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} catch (Exception e) {
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username = null;
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}
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return username;
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}
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/**
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* 从token中获取过期时间
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*/
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private Date getExpiredDateFromToken(String token) {
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Claims claims = getClaimsFromToken(token);
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return claims.getExpiration();
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}
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/**
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* 验证token是否还有效
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*
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* @param token 客户端传入的token
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* @param userDetails 从数据库中查询出来的用户信息
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*/
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public boolean validateToken(String token, UserDetails userDetails) {
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String tagUsername = getUserNameFromToken(token);
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String username=tagUsername.substring(0,tagUsername.lastIndexOf("_"));
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if(StringUtils.isBlank(username)||!username.equals(userDetails.getUsername())){
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return false;
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}
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String tokenKey=redisUtils.generateKey(CacheConstant.SYS_USER_TOKEN+md5Encode(token));
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String userKey=redisUtils.generateKey(CacheConstant.SYS_USER_TOKEN+username);
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String cacheToken= (String) redisUtils.get(tokenKey);
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if(StringUtils.isBlank(cacheToken)||isTokenExpired(cacheToken)){
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return false;
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}
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if(isNeedUpdate(cacheToken)){
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String newToken=createToken(tagUsername);
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// 设置超时时间
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redisUtils.set(tokenKey,newToken,EXPIRATION,TimeUnit.SECONDS);
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redisUtils.expire(userKey,(EXPIRATION)+2);
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}
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return true;
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}
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/**
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* 判断token是否已经失效
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*/
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private boolean isTokenExpired(String token) {
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Date expiredDate = getExpiredDateFromToken(token);
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return expiredDate.before(new Date());
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}
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/**
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* 生成token的过期时间
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*/
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private Date generateExpirationDate() {
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return new Date(System.currentTimeMillis() + EXPIRATION * 1000);
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}
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public boolean isNeedUpdate(String token){
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Date expertsAt =null;
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try {
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Claims claims = getClaimsFromToken(token);
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expertsAt = claims.getExpiration();
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}catch (Exception e){
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throw new ApiException("token非法无效");
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}
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//如果剩余过期时间少于过期时常的一半时 需要更新
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return (expertsAt.getTime()-System.currentTimeMillis()) < MILLIS_MINUTE_TEN;
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}
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/**
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* 获取请求token
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*
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* @param request
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* @return token
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*/
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private String getToken(HttpServletRequest request)
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{
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return request.getHeader(HEADER);
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}
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/**
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* 获取redis key
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* @param username
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* @return
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*/
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private String getTokenKey(String username)
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{
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return redisUtils.generateKey(CacheConstant.LOGIN_TOKEN_KEY + username);
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}
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/**
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* md5加密
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* @param token
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* @return
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*/
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public static String md5Encode(String token){
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return DigestUtil.md5Hex(token);
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}
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/**
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* 清空旧的登录信息，保证同时只有一个用户再登录，后登录用户会挤掉前一个用户
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* @param username
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*/
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public void cacheUserToken(String username,String newToken){
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String userKey = redisUtils.generateKey(CacheConstant.SYS_USER_TOKEN + username);
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String oldToken = (String) redisUtils.get(userKey);
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if (StringUtils.isNotBlank(oldToken)) {
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String oldTokenkey = redisUtils.generateKey(CacheConstant.SYS_USER_TOKEN +md5Encode(oldToken));
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redisUtils.del(oldTokenkey);
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redisUtils.del(userKey);
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}
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redisUtils.set(userKey, newToken,(TokenService.EXPIRATION)+2, TimeUnit.SECONDS);
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String tokenKey= redisUtils.generateKey(CacheConstant.SYS_USER_TOKEN+md5Encode(newToken));
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// 设置超时时间
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redisUtils.set(tokenKey,newToken,TokenService.EXPIRATION, TimeUnit.SECONDS);
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}
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}
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