001/*
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019
020package org.apache.hadoop.hbase.rest.filter;
021
022import java.io.IOException;
023import java.io.OutputStream;
024import java.util.HashSet;
025import java.util.Locale;
026import java.util.Set;
027import java.util.StringTokenizer;
028
029import javax.servlet.Filter;
030import javax.servlet.FilterChain;
031import javax.servlet.FilterConfig;
032import javax.servlet.ServletException;
033import javax.servlet.ServletRequest;
034import javax.servlet.ServletResponse;
035import javax.servlet.http.HttpServletRequest;
036import javax.servlet.http.HttpServletResponse;
037
038import org.apache.yetus.audience.InterfaceAudience;
039import org.apache.hadoop.hbase.HBaseInterfaceAudience;
040
041@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
042public class GzipFilter implements Filter {
043  private Set<String> mimeTypes = new HashSet<>();
044
045  @Override
046  public void init(FilterConfig filterConfig) throws ServletException {
047    String s = filterConfig.getInitParameter("mimeTypes");
048    if (s != null) {
049      StringTokenizer tok = new StringTokenizer(s, ",", false);
050      while (tok.hasMoreTokens()) {
051        mimeTypes.add(tok.nextToken());
052      }
053    }
054  }
055
056  @Override
057  public void destroy() {
058  }
059
060  @Override
061  public void doFilter(ServletRequest req, ServletResponse rsp,
062      FilterChain chain) throws IOException, ServletException {
063    HttpServletRequest request = (HttpServletRequest)req;
064    HttpServletResponse response = (HttpServletResponse)rsp;
065    String contentEncoding = request.getHeader("content-encoding");
066    String acceptEncoding = request.getHeader("accept-encoding");
067    String contentType = request.getHeader("content-type");
068    if ((contentEncoding != null) &&
069        (contentEncoding.toLowerCase(Locale.ROOT).indexOf("gzip") > -1)) {
070      request = new GZIPRequestWrapper(request);
071    }
072    if (((acceptEncoding != null) &&
073          (acceptEncoding.toLowerCase(Locale.ROOT).indexOf("gzip") > -1)) ||
074        ((contentType != null) && mimeTypes.contains(contentType))) {
075      response = new GZIPResponseWrapper(response);
076    }
077    chain.doFilter(request, response);
078    if (response instanceof GZIPResponseWrapper) {
079      OutputStream os = response.getOutputStream();
080      if (os instanceof GZIPResponseStream) {
081        ((GZIPResponseStream)os).finish();
082      }
083    }
084  }
085
086}