Spring Security权限校验 修改携带token访问时的过滤器

2023-03-07 21:25:31 by 极墨笔记 in SpringBoot

修改原来的代码http://www.zeromemos.com/index/article/read/id/372.html

从请求头获取token，从token获取username，从token获取username，拿着username到Redis查询权限数据

package com.atguigu.security.filter;

import com.alibaba.fastjson.JSON;
import com.atguigu.common.jwt.JwtHelper;
import com.atguigu.common.result.ResponseUtil;
import com.atguigu.common.result.Result;
import com.atguigu.common.result.ResultCodeEnum;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class TokenAuthenticationFilter extends OncePerRequestFilter {

    private RedisTemplate redisTemplate;
    //构造时传入Redis操作类
    public TokenAuthenticationFilter(RedisTemplate redisTemplate){
        this.redisTemplate = redisTemplate;
    }

    //判断是否已经携带有效token登入信息
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        logger.info("uri:"+request.getRequestURI());
        //如果是登录接口，直接放行
        if("/admin/system/index/login".equals(request.getRequestURI())) {
            chain.doFilter(request, response);
            return;
        }

        //获取token信息
        UsernamePasswordAuthenticationToken authentication = getAuthentication(request);
        if(null != authentication) {
            //将authentication放入SecurityContextHolder
            SecurityContextHolder.getContext().setAuthentication(authentication);
            chain.doFilter(request, response);
        } else {
            //认证失败
            ResponseUtil.out(response, Result.build(null, ResultCodeEnum.LOGIN_ERROR));
        }
    }

    /**
     * 从请求头里获取token信息
     * @param request
     * @return
     */
    private UsernamePasswordAuthenticationToken getAuthentication(HttpServletRequest request) {
        // token置于header里
        String token = request.getHeader("token");
        logger.info("token:"+token);
        if (!StringUtils.isEmpty(token)) {
            String useruame = JwtHelper.getUsername(token);
            logger.info("username:"+useruame);
            if (!StringUtils.isEmpty(useruame)) {
                //通过username从redis中获取权限数据
                String authString = (String)redisTemplate.opsForValue().get(useruame);
                //把redis获取的字符串数据换成集合类型的数据ArrayList<SimpleGrantedAuthority>
                if (!StringUtils.isEmpty(authString)){
                    List<Map> mapList = JSON.parseArray(authString, Map.class);
                    System.out.println(mapList);
                    ArrayList<SimpleGrantedAuthority> authList = new ArrayList<>();
                    for (Map map : mapList) {
                        String authority = (String) map.get("authority");
                        authList.add(new SimpleGrantedAuthority(authority));
                    }
                    return new UsernamePasswordAuthenticationToken(useruame, null, authList);
                } else {
                    return new UsernamePasswordAuthenticationToken(useruame, null, new ArrayList<>());
                }
            }
        }
        return null;
    }
}