| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.dfs; |
| |
| import javax.servlet.*; |
| import javax.servlet.http.*; |
| import java.io.*; |
| import java.net.*; |
| import org.apache.hadoop.fs.*; |
| import org.apache.hadoop.security.UnixUserGroupInformation; |
| import org.apache.hadoop.conf.*; |
| |
| public class StreamFile extends DfsServlet { |
| static InetSocketAddress nameNodeAddr; |
| static DataNode datanode = null; |
| private static final Configuration masterConf = new Configuration(); |
| static { |
| if ((datanode = DataNode.getDataNode()) != null) { |
| nameNodeAddr = datanode.getNameNodeAddr(); |
| } |
| } |
| public void doGet(HttpServletRequest request, HttpServletResponse response) |
| throws ServletException, IOException { |
| Configuration conf = new Configuration(masterConf); |
| UnixUserGroupInformation.saveToConf(conf, |
| UnixUserGroupInformation.UGI_PROPERTY_NAME, getUGI(request)); |
| |
| String filename = request.getParameter("filename"); |
| if (filename == null || filename.length() == 0) { |
| response.setContentType("text/plain"); |
| PrintWriter out = response.getWriter(); |
| out.print("Invalid input"); |
| return; |
| } |
| DFSClient dfs = new DFSClient(nameNodeAddr, conf); |
| FSInputStream in = dfs.open(filename); |
| OutputStream os = response.getOutputStream(); |
| response.setHeader("Content-Disposition", "attachment; filename=\"" + |
| filename + "\""); |
| response.setContentType("application/octet-stream"); |
| byte buf[] = new byte[4096]; |
| try { |
| int bytesRead; |
| while ((bytesRead = in.read(buf)) != -1) { |
| os.write(buf, 0, bytesRead); |
| } |
| } finally { |
| in.close(); |
| os.close(); |
| dfs.close(); |
| } |
| } |
| } |