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;
024import org.apache.hadoop.util.StringUtils;
025
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 java.io.IOException;
035import java.util.HashSet;
036import java.util.Set;
037
038/**
039 * Filter that Enforces the content-type to be application/octet-stream for
040 * POST and PUT requests.
041 */
042@InterfaceAudience.Private
043public class CheckUploadContentTypeFilter implements Filter {
044
045  private static final Set<String> UPLOAD_OPERATIONS = new HashSet<String>();
046
047  static {
048    UPLOAD_OPERATIONS.add(HttpFSFileSystem.Operation.APPEND.toString());
049    UPLOAD_OPERATIONS.add(HttpFSFileSystem.Operation.CREATE.toString());
050  }
051
052  /**
053   * Initializes the filter.
054   * <p>
055   * This implementation is a NOP.
056   *
057   * @param config filter configuration.
058   *
059   * @throws ServletException thrown if the filter could not be initialized.
060   */
061  @Override
062  public void init(FilterConfig config) throws ServletException {
063  }
064
065  /**
066   * Enforces the content-type to be application/octet-stream for
067   * POST and PUT requests.
068   *
069   * @param request servlet request.
070   * @param response servlet response.
071   * @param chain filter chain.
072   *
073   * @throws IOException thrown if an IO error occurrs.
074   * @throws ServletException thrown if a servet error occurrs.
075   */
076  @Override
077  public void doFilter(ServletRequest request, ServletResponse response,
078                       FilterChain chain)
079    throws IOException, ServletException {
080    boolean contentTypeOK = true;
081    HttpServletRequest httpReq = (HttpServletRequest) request;
082    HttpServletResponse httpRes = (HttpServletResponse) response;
083    String method = httpReq.getMethod();
084    if (method.equals("PUT") || method.equals("POST")) {
085      String op = httpReq.getParameter(HttpFSFileSystem.OP_PARAM);
086      if (op != null && UPLOAD_OPERATIONS.contains(
087          StringUtils.toUpperCase(op))) {
088        if ("true".equalsIgnoreCase(httpReq.getParameter(HttpFSParametersProvider.DataParam.NAME))) {
089          String contentType = httpReq.getContentType();
090          contentTypeOK =
091            HttpFSFileSystem.UPLOAD_CONTENT_TYPE.equalsIgnoreCase(contentType);
092        }
093      }
094    }
095    if (contentTypeOK) {
096      chain.doFilter(httpReq, httpRes);
097    }
098    else {
099      httpRes.sendError(HttpServletResponse.SC_BAD_REQUEST,
100                        "Data upload requests must have content-type set to '" +
101                        HttpFSFileSystem.UPLOAD_CONTENT_TYPE + "'");
102
103    }
104  }
105
106  /**
107   * Destroys the filter.
108   * <p>
109   * This implementation is a NOP.
110   */
111  @Override
112  public void destroy() {
113  }
114
115}