修复远程文件文件名带有穿越漏洞的BUG

server/src/main/java/cn/keking/utils/WebUtils.java

@@ -79,7 +79,9 @@ public class WebUtils {
             urlStr = clearFullfilenameParam(urlStr);
         } else {
             fullFileName = getFileNameFromURL(urlStr); //获取文件名
-
+        }
+        if (KkFileUtils.isIllegalFileName(fullFileName)) { //判断文件名是否带有穿越漏洞
+            return null;
         }
         if (!UrlEncoderUtils.hasUrlEncoded(fullFileName)) {  //判断文件名是否转义
             try {

server/src/main/java/cn/keking/web/controller/OnlinePreviewController.java

@@ -21,6 +21,7 @@ import org.springframework.http.MediaType;
 import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
+import org.springframework.util.ObjectUtils;
 import org.springframework.util.StringUtils;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.ResponseBody;
@@ -76,7 +77,11 @@ public class OnlinePreviewController {
         model.addAttribute("file", fileAttribute);
         FilePreview filePreview = previewFactory.get(fileAttribute);
         logger.info("预览文件url：{}，previewType：{}", fileUrl, fileAttribute.getType());
-        return filePreview.filePreviewHandle(WebUtils.urlEncoderencode(fileUrl), model, fileAttribute);  //统一在这里处理 url
+        fileUrl =WebUtils.urlEncoderencode(fileUrl);
+        if (ObjectUtils.isEmpty(fileUrl)) {
+            return otherFilePreview.notSupportedFile(model, "非法路径,不允许访问");
+        }
+        return filePreview.filePreviewHandle(fileUrl, model, fileAttribute);  //统一在这里处理 url
     }
 
     @GetMapping( "/picturesPreview")