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.fs.http.client.HttpFSFileSystem;
023
024import javax.servlet.Filter;
025import javax.servlet.FilterChain;
026import javax.servlet.FilterConfig;
027import javax.servlet.ServletException;
028import javax.servlet.ServletRequest;
029import javax.servlet.ServletResponse;
030import javax.servlet.http.HttpServletRequest;
031import javax.servlet.http.HttpServletResponse;
032import java.io.IOException;
033import java.net.InetAddress;
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 */
041public 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}