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.classification.InterfaceAudience;
023    import org.apache.hadoop.fs.http.client.HttpFSFileSystem;
024    
025    import javax.servlet.Filter;
026    import javax.servlet.FilterChain;
027    import javax.servlet.FilterConfig;
028    import javax.servlet.ServletException;
029    import javax.servlet.ServletRequest;
030    import javax.servlet.ServletResponse;
031    import javax.servlet.http.HttpServletRequest;
032    import javax.servlet.http.HttpServletResponse;
033    import java.io.IOException;
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    @InterfaceAudience.Private
042    public class CheckUploadContentTypeFilter implements Filter {
043    
044      private static final Set<String> UPLOAD_OPERATIONS = new HashSet<String>();
045    
046      static {
047        UPLOAD_OPERATIONS.add(HttpFSFileSystem.Operation.APPEND.toString());
048        UPLOAD_OPERATIONS.add(HttpFSFileSystem.Operation.CREATE.toString());
049      }
050    
051      /**
052       * Initializes the filter.
053       * <p/>
054       * This implementation is a NOP.
055       *
056       * @param config filter configuration.
057       *
058       * @throws ServletException thrown if the filter could not be initialized.
059       */
060      @Override
061      public void init(FilterConfig config) throws ServletException {
062      }
063    
064      /**
065       * Enforces the content-type to be application/octet-stream for
066       * POST and PUT requests.
067       *
068       * @param request servlet request.
069       * @param response servlet response.
070       * @param chain filter chain.
071       *
072       * @throws IOException thrown if an IO error occurrs.
073       * @throws ServletException thrown if a servet error occurrs.
074       */
075      @Override
076      public void doFilter(ServletRequest request, ServletResponse response,
077                           FilterChain chain)
078        throws IOException, ServletException {
079        boolean contentTypeOK = true;
080        HttpServletRequest httpReq = (HttpServletRequest) request;
081        HttpServletResponse httpRes = (HttpServletResponse) response;
082        String method = httpReq.getMethod();
083        if (method.equals("PUT") || method.equals("POST")) {
084          String op = httpReq.getParameter(HttpFSFileSystem.OP_PARAM);
085          if (op != null && UPLOAD_OPERATIONS.contains(op.toUpperCase())) {
086            if ("true".equalsIgnoreCase(httpReq.getParameter(HttpFSParametersProvider.DataParam.NAME))) {
087              String contentType = httpReq.getContentType();
088              contentTypeOK =
089                HttpFSFileSystem.UPLOAD_CONTENT_TYPE.equalsIgnoreCase(contentType);
090            }
091          }
092        }
093        if (contentTypeOK) {
094          chain.doFilter(httpReq, httpRes);
095        }
096        else {
097          httpRes.sendError(HttpServletResponse.SC_BAD_REQUEST,
098                            "Data upload requests must have content-type set to '" +
099                            HttpFSFileSystem.UPLOAD_CONTENT_TYPE + "'");
100    
101        }
102      }
103    
104      /**
105       * Destroys the filter.
106       * <p/>
107       * This implementation is a NOP.
108       */
109      @Override
110      public void destroy() {
111      }
112    
113    }