java - 在 loadUserDetails 方法中捕获 httpServeletRequest

Question

我有一个自定义的 spring AuthenticationProvider 类，但尝试在 loadUserDetails 方法中拦截 HTTPServletRequest 和 HTTPServletResponse 。

@Component("darnGoodAuthenticaionProvider")
public class DarnGoodAuthenticaionProvider 
                    extends HandlerInterceptorAdapter 
                    implements AuthenticationUserDetailsService {
    private HttpServletRequest request;
    private HttpServletResponse response;

    @Override
    public boolean preHandle(HttpServletRequest request, 
                            HttpServletResponse response, Object handler) 
                            throws Exception {
            this.request = request;
            this.response = response;
            // we don't want anything falling here
            return true;
}

    @Override
    public UserDetails loadUserDetails(Authentication token)throws 
                                                    UsernameNotFoundException{
           .......
    }
}

我知道 HandlerIntercepterAdapter 中的 preHandler 方法能够完成这项工作，但我如何确定 preHandler 方法在 loadUserDetails 之前被调用，以便我可以准备好请求和响应？

谢谢

Answer 1

在 servlet 容器上，每个请求将从收到请求的那一刻开始处理，直到仅由一个线程返回响应(请求 == 当前线程)。

因此，问题是在 Spring Security 过滤器链之前放置一个 Servlet 过滤器(过滤器映射元素位于 Spring Security 的过滤器映射之上)，并使用 ThreadLocal 变量将请求和响应存储在线程中 - 另请参阅此 answer .

然后在 DarnGoodAuthenticaionProvider 上使用静态方法 RequestResponseHolder.getRequest() 访问请求。

web.xml 配置:

<filter>
    <filter-name>saveRequestResponseFilter</filter-name>
    <filter-class>sample.save.request.filter.SaveRequestResponseFilter</filter-class>
</filter>

<filter-mapping>
    <filter-name>saveRequestResponseFilter</filter-name>
    <url-pattern>/mobilews/*</url-pattern>
</filter-mapping>

过滤以在线程中保存请求响应:

public class SaveRequestResponseFilter implements Filter {

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse resp = (HttpServletResponse) response;

        RequestResponseHolder.setRequestResponse(req,resp);
        try {
            chain.doFilter(request, response);
        }
        finally {
            RequestResponseHolder.clear();
        }
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        ...
    }

    @Override
    public void destroy() {
       ...
    }
}

请求/响应持有者:

public class RequestResponseHolder {

    private static ThreadLocal<HttpServletRequest> requestHolder = new ThreadLocal<HttpServletRequest>();
    private static ThreadLocal<HttpServletResponse> responseHolder = new ThreadLocal<HttpServletResponse>();


    public static void setRequestResponse(HttpServletRequest request, HttpServletResponse response) {
        requestHolder.set(request);
        responseHolder.set(response);
    }

    public static HttpServletRequest getServletRequest(){
         return requestHolder.get();
    }

    public static HttpServletResponse getServletResponse()  {
        return responseHolder.get();
    }

    public static void clear() {
        requestHolder.remove();
        responseHolder.remove();
    }
}

从 DarnGoodAuthenticaionProvider 获取请求:

HttpServletRequest req = RequestResponseHolder.getServletRequest();