content: package com.newone.mall.jwt.filter;
  
  import com.newone.mall.jwt.utils.JwtTokenHelper;
  import io.jsonwebtoken.ExpiredJwtException;
  import io.jsonwebtoken.MalformedJwtException;
  import io.jsonwebtoken.UnsupportedJwtException;
  import io.jsonwebtoken.security.SignatureException;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.commons.lang3.StringUtils;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.beans.factory.annotation.Value;
  import org.springframework.security.authentication.AuthenticationServiceException;
  import org.springframework.security.authentication.BadCredentialsException;
  import org.springframework.security.authentication.CredentialsExpiredException;
  import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
  import org.springframework.security.core.context.SecurityContext;
  import org.springframework.security.core.context.SecurityContextHolder;
  import org.springframework.security.core.userdetails.UserDetails;
  import org.springframework.security.core.userdetails.UserDetailsService;
  import org.springframework.security.web.AuthenticationEntryPoint;
  import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
  import org.springframework.stereotype.Component;
  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.Objects;
  @Slf4j
  public class TokenAuthenticationFilter extends OncePerRequestFilter {
      @Value("${jwt.tokenPrefix}")
      private String tokenPrefix;
  
      @Value("${jwt.tokenHeaderKey}")
      private String tokenHeaderKey;
  
      @Autowired
      private JwtTokenHelper jwtTokenHelper;
  
      @Autowired
      private UserDetailsService userDetailsService;
  
      @Autowired
      private AuthenticationEntryPoint authenticationEntryPoint;
  
      @Override
      protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
          // 从请求头中获取 key 为 Authorization 的值
          String header = request.getHeader(tokenHeaderKey);
  
          // 判断 value 值是否以 Bearer 开头
          if (StringUtils.startsWith(header, tokenPrefix)) {
              // 截取 Token 令牌
              String token = StringUtils.substring(header, 7);
              log.info("Token: {}", token);
  
              // 判空 Token
              if (StringUtils.isNotBlank(token)) {
                  try {
                      // 校验 Token 是否可用, 若解析异常，针对不同异常做出不同的响应参数
                      jwtTokenHelper.validateToken(token);
                  } catch (SignatureException | MalformedJwtException | UnsupportedJwtException | IllegalArgumentException e) {
                      // 抛出异常，统一让 AuthenticationEntryPoint 处理响应参数
                      authenticationEntryPoint.commence(request, response, new AuthenticationServiceException("Token 不可用"));
                      return;
                  } catch (ExpiredJwtException e) {
                      authenticationEntryPoint.commence(request, response, new AuthenticationServiceException("Token 已失效"));
                      return;
                  }
  
                  // 从 Token 中解析出用户名
                  String username = jwtTokenHelper.getUsernameByToken(token);
                  if (StringUtils.isNotBlank(username)
                          && Objects.isNull(SecurityContextHolder.getContext().getAuthentication())) {
                      // 根据用户名获取用户详情信息
                      UserDetails userDetails = userDetailsService.loadUserByUsername(username);
  
                      // 将用户信息存入 authentication，方便后续校验
                      UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(userDetails, null,
                              userDetails.getAuthorities());
                      authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                      // 将 authentication 存入 ThreadLocal，方便后续获取用户信息
                      SecurityContextHolder.getContext().setAuthentication(authentication);
                  }
              }
          }
  
          // 继续执行写一个过滤器
          filterChain.doFilter(request, response);
      }
  }
  