001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.rest.filter;
019
020import java.io.IOException;
021import java.io.OutputStream;
022import java.util.HashSet;
023import java.util.Locale;
024import java.util.Set;
025import java.util.StringTokenizer;
026import javax.servlet.Filter;
027import javax.servlet.FilterChain;
028import javax.servlet.FilterConfig;
029import javax.servlet.ServletException;
030import javax.servlet.ServletRequest;
031import javax.servlet.ServletResponse;
032import javax.servlet.http.HttpServletRequest;
033import javax.servlet.http.HttpServletResponse;
034import org.apache.hadoop.hbase.HBaseInterfaceAudience;
035import org.apache.yetus.audience.InterfaceAudience;
036
037@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
038public class GzipFilter implements Filter {
039  private Set<String> mimeTypes = new HashSet<>();
040
041  @Override
042  public void init(FilterConfig filterConfig) {
043    String s = filterConfig.getInitParameter("mimeTypes");
044    if (s != null) {
045      StringTokenizer tok = new StringTokenizer(s, ",", false);
046      while (tok.hasMoreTokens()) {
047        mimeTypes.add(tok.nextToken());
048      }
049    }
050  }
051
052  @Override
053  public void destroy() {
054  }
055
056  @Override
057  public void doFilter(ServletRequest req, ServletResponse rsp, FilterChain chain)
058    throws IOException, ServletException {
059    HttpServletRequest request = (HttpServletRequest) req;
060    HttpServletResponse response = (HttpServletResponse) rsp;
061    String contentEncoding = request.getHeader("content-encoding");
062    String acceptEncoding = request.getHeader("accept-encoding");
063    String contentType = request.getHeader("content-type");
064    if ((contentEncoding != null) && (contentEncoding.toLowerCase(Locale.ROOT).contains("gzip"))) {
065      request = new GZIPRequestWrapper(request);
066    }
067    if (
068      ((acceptEncoding != null) && (acceptEncoding.toLowerCase(Locale.ROOT).contains("gzip")))
069        || ((contentType != null) && mimeTypes.contains(contentType))
070    ) {
071      response = new GZIPResponseWrapper(response);
072    }
073    chain.doFilter(request, response);
074    if (response instanceof GZIPResponseWrapper) {
075      OutputStream os = response.getOutputStream();
076      if (os instanceof GZIPResponseStream) {
077        ((GZIPResponseStream) os).finish();
078      }
079    }
080  }
081}