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     */
018    
019    package org.apache.hadoop.fs.http.server;
020    
021    
022    import org.apache.hadoop.fs.http.client.HttpFSFileSystem;
023    
024    import javax.servlet.Filter;
025    import javax.servlet.FilterChain;
026    import javax.servlet.FilterConfig;
027    import javax.servlet.ServletException;
028    import javax.servlet.ServletRequest;
029    import javax.servlet.ServletResponse;
030    import javax.servlet.http.HttpServletRequest;
031    import javax.servlet.http.HttpServletResponse;
032    import java.io.IOException;
033    import java.net.InetAddress;
034    import java.util.HashSet;
035    import java.util.Set;
036    
037    /**
038     * Filter that Enforces the content-type to be application/octet-stream for
039     * POST and PUT requests.
040     */
041    public class CheckUploadContentTypeFilter implements Filter {
042    
043      private static final Set<String> UPLOAD_OPERATIONS = new HashSet<String>();
044    
045      static {
046        UPLOAD_OPERATIONS.add(HttpFSFileSystem.PostOpValues.APPEND.toString());
047        UPLOAD_OPERATIONS.add(HttpFSFileSystem.PutOpValues.CREATE.toString());
048      }
049    
050      /**
051       * Initializes the filter.
052       * <p/>
053       * This implementation is a NOP.
054       *
055       * @param config filter configuration.
056       *
057       * @throws ServletException thrown if the filter could not be initialized.
058       */
059      @Override
060      public void init(FilterConfig config) throws ServletException {
061      }
062    
063      /**
064       * Enforces the content-type to be application/octet-stream for
065       * POST and PUT requests.
066       *
067       * @param request servlet request.
068       * @param response servlet response.
069       * @param chain filter chain.
070       *
071       * @throws IOException thrown if an IO error occurrs.
072       * @throws ServletException thrown if a servet error occurrs.
073       */
074      @Override
075      public void doFilter(ServletRequest request, ServletResponse response,
076                           FilterChain chain)
077        throws IOException, ServletException {
078        boolean contentTypeOK = true;
079        HttpServletRequest httpReq = (HttpServletRequest) request;
080        HttpServletResponse httpRes = (HttpServletResponse) response;
081        String method = httpReq.getMethod();
082        if (method.equals("PUT") || method.equals("POST")) {
083          String op = httpReq.getParameter(HttpFSFileSystem.OP_PARAM);
084          if (op != null && UPLOAD_OPERATIONS.contains(op.toUpperCase())) {
085            if ("true".equalsIgnoreCase(httpReq.getParameter(HttpFSParams.DataParam.NAME))) {
086              String contentType = httpReq.getContentType();
087              contentTypeOK =
088                HttpFSFileSystem.UPLOAD_CONTENT_TYPE.equalsIgnoreCase(contentType);
089            }
090          }
091        }
092        if (contentTypeOK) {
093          chain.doFilter(httpReq, httpRes);
094        }
095        else {
096          httpRes.sendError(HttpServletResponse.SC_BAD_REQUEST,
097                            "Data upload requests must have content-type set to '" +
098                            HttpFSFileSystem.UPLOAD_CONTENT_TYPE + "'");
099    
100        }
101      }
102    
103      /**
104       * Destroys the filter.
105       * <p/>
106       * This implementation is a NOP.
107       */
108      @Override
109      public void destroy() {
110      }
111    
112    }