fix(XSSInterceptor): 增强XSS拦截器对请求头的处理

修改XSS拦截器对请求头的检查逻辑，当检测到XSS攻击时直接拒绝请求并返回400错误响应。新增错误响应写入方法，记录攻击日志。

biji-houdaun/src/main/java/com/test/bijihoudaun/interceptor/XSSInterceptor.java

@@ -2,8 +2,12 @@ package com.test.bijihoudaun.interceptor;
 
 import cn.hutool.core.util.StrUtil;
 import cn.hutool.http.HtmlUtil;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.test.bijihoudaun.common.response.R;
+import com.test.bijihoudaun.common.response.ResultCode;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.web.servlet.HandlerInterceptor;
 
 import java.util.Enumeration;
@@ -14,12 +18,15 @@ import java.util.Enumeration;
  * 注意：此拦截器只能过滤 URL 参数和表单数据，无法过滤 @RequestBody 的 JSON 数据
  * JSON 数据的 XSS 过滤由 XssStringDeserializer 处理
  */
+@Slf4j
 public class XSSInterceptor implements HandlerInterceptor {
 
     @Override
     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
-        // 过滤请求头
+        // 过滤请求头，发现 XSS 攻击则拒绝请求
-        filterHeaders(request);
+        if (!filterHeaders(request, response)) {
+            return false;
+        }
 
         // 过滤请求参数（URL 参数和表单数据）
         filterParameters(request);
@@ -29,11 +36,12 @@ public class XSSInterceptor implements HandlerInterceptor {
 
     /**
      * 过滤请求头
+     * @return true-通过，false-拒绝请求
      */
-    private void filterHeaders(HttpServletRequest request) {
+    private boolean filterHeaders(HttpServletRequest request, HttpServletResponse response) throws Exception {
         Enumeration<String> headerNames = request.getHeaderNames();
         if (headerNames == null) {
-            return;
+            return true;
         }
 
         while (headerNames.hasMoreElements()) {
@@ -41,12 +49,15 @@ public class XSSInterceptor implements HandlerInterceptor {
             String headerValue = request.getHeader(headerName);
             if (StrUtil.isNotBlank(headerValue)) {
                 String filteredValue = HtmlUtil.filter(headerValue);
-                // 注意：请求头无法直接修改，这里只是记录日志
+                // 发现 XSS 内容，记录日志并拒绝请求
                 if (!headerValue.equals(filteredValue)) {
-                    // 发现 XSS 内容，记录日志
+                    log.warn("检测到XSS攻击，请求头：{}，原始值：{}", headerName, headerValue);
+                    writeErrorResponse(response, "检测到恶意内容，请求被拒绝");
+                    return false;
                 }
             }
         }
+        return true;
     }
 
     /**
@@ -65,4 +76,16 @@ public class XSSInterceptor implements HandlerInterceptor {
             }
         }
     }
+
+    /**
+     * 写入错误响应
+     */
+    private void writeErrorResponse(HttpServletResponse response, String message) throws Exception {
+        response.setContentType("application/json;charset=UTF-8");
+        response.setStatus(400);
+        ObjectMapper mapper = new ObjectMapper();
+        response.getWriter().write(mapper.writeValueAsString(
+                R.fail(ResultCode.FAILED.getCode(), message)
+        ));
+    }
 }