content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.ambari.server.security.authentication;
  
  import java.io.BufferedReader;
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  
  import jakarta.servlet.Filter;
  import jakarta.servlet.FilterChain;
  import jakarta.servlet.ReadListener;
  import jakarta.servlet.ServletException;
  import jakarta.servlet.ServletInputStream;
  import jakarta.servlet.ServletRequest;
  import jakarta.servlet.ServletResponse;
  import jakarta.servlet.http.HttpServletRequest;
  import jakarta.servlet.http.HttpServletRequestWrapper;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  public class RequestBodyCachingFilter implements Filter {
      private static final Logger LOG = LoggerFactory.getLogger(RequestBodyCachingFilter.class);
      @Override
      public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
              throws IOException, ServletException {
          if (request instanceof HttpServletRequest) {
              HttpServletRequest httpRequest = (HttpServletRequest) request;
              HttpServletRequestWrapper wrappedRequest = new CachedBodyHttpServletRequest(httpRequest);
              chain.doFilter(wrappedRequest, response);
          } else {
              chain.doFilter(request, response);
          }
      }
  
      private static class CachedBodyHttpServletRequest extends HttpServletRequestWrapper {
  
          private byte[] cachedBody;
  
          public CachedBodyHttpServletRequest(HttpServletRequest request) throws IOException {
              super(request);
              InputStream requestInputStream = request.getInputStream();
              this.cachedBody = requestInputStream.readAllBytes();
          }
  
          @Override
          public ServletInputStream getInputStream() throws IOException {
              return new CachedBodyServletInputStream(this.cachedBody);
          }
  
          @Override
          public BufferedReader getReader() throws IOException {
              ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(this.cachedBody);
              return new BufferedReader(new InputStreamReader(byteArrayInputStream));
          }
      }
  
      private static class CachedBodyServletInputStream extends ServletInputStream {
  
          private final ByteArrayInputStream byteArrayInputStream;
  
          public CachedBodyServletInputStream(byte[] cachedBody) {
              this.byteArrayInputStream = new ByteArrayInputStream(cachedBody);
          }
  
          @Override
          public boolean isFinished() {
              return byteArrayInputStream.available() == 0;
          }
  
          @Override
          public boolean isReady() {
              return true;
          }
  
          @Override
          public void setReadListener(ReadListener readListener) {
              throw new UnsupportedOperationException();
          }
  
          @Override
          public int read() throws IOException {
              return byteArrayInputStream.read();
          }
      }
  }
  