| /** |
| * 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.hdfs.server.namenode; |
| |
| import java.io.IOException; |
| import java.net.InetSocketAddress; |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| |
| import javax.servlet.ServletContext; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hdfs.DFSClient; |
| import org.apache.hadoop.hdfs.protocol.ClientProtocol; |
| import org.apache.hadoop.hdfs.protocol.DatanodeID; |
| import org.apache.hadoop.hdfs.protocol.DatanodeInfo; |
| import org.apache.hadoop.hdfs.server.common.JspHelper; |
| import org.apache.hadoop.hdfs.HdfsConfiguration; |
| import org.apache.hadoop.security.UserGroupInformation; |
| |
| /** |
| * A base class for the servlets in DFS. |
| */ |
| abstract class DfsServlet extends HttpServlet { |
| /** For java.io.Serializable */ |
| private static final long serialVersionUID = 1L; |
| |
| static final Log LOG = LogFactory.getLog(DfsServlet.class.getCanonicalName()); |
| |
| /** |
| * Create a {@link NameNode} proxy from the current {@link ServletContext}. |
| */ |
| protected ClientProtocol createNameNodeProxy() throws IOException { |
| ServletContext context = getServletContext(); |
| InetSocketAddress nnAddr = (InetSocketAddress)context.getAttribute("name.node.address"); |
| Configuration conf = new HdfsConfiguration( |
| (Configuration)context.getAttribute("name.conf")); |
| return DFSClient.createNamenode(nnAddr, conf); |
| } |
| |
| /** Create a URI for redirecting request */ |
| protected URI createRedirectUri(String servletpath, |
| UserGroupInformation ugi, |
| DatanodeID host, |
| HttpServletRequest request, |
| NameNode nn |
| ) throws IOException, URISyntaxException { |
| final String hostname = host instanceof DatanodeInfo? |
| ((DatanodeInfo)host).getHostName(): host.getHost(); |
| final String scheme = request.getScheme(); |
| final int port = "https".equals(scheme)? |
| (Integer)getServletContext().getAttribute("datanode.https.port") |
| : host.getInfoPort(); |
| final String filename = request.getPathInfo(); |
| StringBuilder params = new StringBuilder(); |
| params.append("filename="); |
| params.append(filename); |
| if (UserGroupInformation.isSecurityEnabled()) { |
| params.append(JspHelper.SET_DELEGATION); |
| params.append(ugi.getTokens().iterator().next().encodeToUrlString()); |
| } else { |
| params.append("&ugi="); |
| params.append(ugi.getShortUserName()); |
| } |
| return new URI(scheme, null, hostname, port, servletpath, |
| params.toString(), null); |
| } |
| |
| /** Get filename from the request */ |
| protected String getFilename(HttpServletRequest request, |
| HttpServletResponse response) throws IOException { |
| final String filename = request.getParameter("filename"); |
| if (filename == null || filename.length() == 0) { |
| throw new IOException("Invalid filename"); |
| } |
| return filename; |
| } |
| |
| protected UserGroupInformation getUGI(HttpServletRequest request, |
| Configuration conf) throws IOException { |
| return JspHelper.getUGI(request, conf); |
| } |
| } |