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
019package org.apache.hadoop.fs.http.server;
020
021
022import org.apache.hadoop.classification.InterfaceAudience;
023import org.apache.hadoop.fs.http.client.HttpFSFileSystem;
024
025import javax.servlet.Filter;
026import javax.servlet.FilterChain;
027import javax.servlet.FilterConfig;
028import javax.servlet.ServletException;
029import javax.servlet.ServletRequest;
030import javax.servlet.ServletResponse;
031import javax.servlet.http.HttpServletRequest;
032import javax.servlet.http.HttpServletResponse;
033import java.io.IOException;
034import java.util.HashSet;
035import 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
042public 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}