package cn.com.goldenwater.dcproj.intercepter;

import cn.com.goldenwater.dcproj.constValue.SplitValue;
import cn.com.goldenwater.dcproj.utils.RequestUtils;
import cn.com.goldenwater.dcproj.utils.ReturnUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.ServletWebRequest;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.HandlerMapping;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.View;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.Map;

@Component
public class FileCheckInterceptor implements HandlerInterceptor {

    @Value("${notFileAllow}")
    private String notFileAllow;

    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response, Object handler) throws Exception {

       /* NativeWebRequest webRequest = new ServletWebRequest(request);
        Map<String, String> map = (Map<String, String>) webRequest.getAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE, RequestAttributes.SCOPE_REQUEST);
        if(map!=null && !map.isEmpty()){
            for(String key:map.keySet()){
                String value=map.get(key);
                String content=RequestUtils.cleanScript(value);
                if(content.contains("error-333:")){
                    ReturnUtils.responseFail(response,"参数存在异常，请仔细检查",5555);
                    return false;
                }
            }
        }*/

        // 判断是否为文件上传请求
        if (request != null && request instanceof MultipartHttpServletRequest) {
            MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
            Map<String, MultipartFile> files = multipartRequest.getFileMap();
            Iterator<String> iterator = files.keySet().iterator();
            if (StringUtils.isBlank(notFileAllow)) {
                //无约束
                return true;
            }
            String[] notArrays = notFileAllow.split(SplitValue.FENHAO_SPLIT);
            if (notArrays.length == 0) {
                //无约束
                return true;
            }
            String filename = "";
            MultipartFile multipartFile = null;
            while (iterator.hasNext()) {
                String formKey = (String) iterator.next();
                multipartFile = multipartRequest.getFile(formKey);
                filename = multipartFile.getOriginalFilename();
                int lastIndexOf = filename.lastIndexOf(".");
                filename = filename.substring(lastIndexOf);
                boolean isFound = false;
                for (String str : notArrays) {
                    if (StringUtils.isBlank(str)) {
                        continue;
                    }
                    if (filename.equals(str) || filename.trim().equals(str)) {
                        isFound = true;
                        break;
                    }
                }

                if (isFound) {
                    response.setCharacterEncoding("UTF-8");
                    response.setContentType("application/json;charset=utf-8");
                    PrintWriter printWriter = response.getWriter();
                    printWriter.write("上传文件有异常，已被系统禁止！");
                    return false;
                }
                multipartFile = null;
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request,
                           HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {
        // TODO Auto-generated method stub

    }

    @Override
    public void afterCompletion(HttpServletRequest request,
                                HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        // TODO Auto-generated method stub

    }


}