content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.alibaba.nacos.core.utils;
  
  import com.alibaba.nacos.common.http.HttpUtils;
  import com.alibaba.nacos.common.http.param.MediaType;
  import com.alibaba.nacos.common.utils.ByteUtils;
  import com.alibaba.nacos.common.utils.StringUtils;
  
  import jakarta.servlet.ReadListener;
  import jakarta.servlet.ServletInputStream;
  import jakarta.servlet.http.HttpServletRequest;
  import jakarta.servlet.http.HttpServletRequestWrapper;
  import java.io.BufferedReader;
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.nio.charset.StandardCharsets;
  import java.util.Map;
  
  /**
   * httprequest wrapper.
   *
   * @author <a href="mailto:liaochuntao@live.com">liaochuntao</a>
   */
  public class ReuseHttpServletRequest extends HttpServletRequestWrapper implements ReuseHttpRequest {
      
      private final HttpServletRequest target;
      
      private byte[] body;
      
      private Map<String, String[]> stringMap;
      
      /**
       * Constructs a request object wrapping the given request.
       *
       * @param request The request to wrap
       * @throws IllegalArgumentException if the request is null
       */
      public ReuseHttpServletRequest(HttpServletRequest request) throws IOException {
          super(request);
          this.target = request;
          this.body = toBytes(request.getInputStream());
          this.stringMap = toDuplication(request);
      }
      
      @Override
      public Object getBody() throws Exception {
          if (StringUtils.containsIgnoreCase(target.getContentType(), MediaType.MULTIPART_FORM_DATA)) {
              return target.getParts();
          } else {
              String s = ByteUtils.toString(body);
              if (StringUtils.isBlank(s)) {
                  return HttpUtils
                          .encodingParams(HttpUtils.translateParameterMap(stringMap), StandardCharsets.UTF_8.name());
              }
              return s;
          }
      }
      
      private byte[] toBytes(InputStream inputStream) throws IOException {
          ByteArrayOutputStream bos = new ByteArrayOutputStream();
          byte[] buffer = new byte[1024];
          int n = 0;
          while ((n = inputStream.read(buffer)) != -1) {
              bos.write(buffer, 0, n);
          }
          return bos.toByteArray();
      }
      
      @Override
      public BufferedReader getReader() throws IOException {
          return new BufferedReader(new InputStreamReader(getInputStream()));
      }
      
      @Override
      public Map<String, String[]> getParameterMap() {
          return stringMap;
      }
      
      @Override
      public String getParameter(String name) {
          String[] values = stringMap.get(name);
          if (values == null || values.length == 0) {
              return null;
          }
          return values[0];
      }
      
      @Override
      public String[] getParameterValues(String name) {
          return stringMap.get(name);
      }
      
      @Override
      public ServletInputStream getInputStream() throws IOException {
          
          final ByteArrayInputStream inputStream = new ByteArrayInputStream(body);
          
          return new ServletInputStream() {
              @Override
              public int read() throws IOException {
                  return inputStream.read();
              }
              
              @Override
              public boolean isFinished() {
                  return false;
              }
              
              @Override
              public boolean isReady() {
                  return false;
              }
              
              @Override
              public void setReadListener(ReadListener readListener) {
              }
          };
      }
      
  }
  