Spring Security携带token访问时的过滤器

2023-03-06 21:50:30 by 极墨笔记 in SpringBoot

将token中的用户信息封装成authentication存入SecurityContextHolder中

完成Spring Security用户认证流程图http://www.zeromemos.com/index/article/read.html?id=367中的第10步骤

package com.atguigu.security.fillter;

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.security.authentication.UsernamePasswordAuthenticationToken;
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.Collections;

public class TokenAuthenticationFilter extends OncePerRequestFilter {

    //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)) {
                return new UsernamePasswordAuthenticationToken(useruame, null, Collections.emptyList());
            }
        }
        return null;
    }
}