HDFS-2845. SBN should not allow browsing of the file system via web UI. Contributed by Bikas Saha.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-1623@1238897 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-1623.txt

@@ -143,3 +143,5 @@ HDFS-2691. Fixes for pipeline recovery in an HA cluster: report RBW replicas imm
 HDFS-2824. Fix failover when prior NN died just after creating an edit log segment. (atm via todd)
 
 HDFS-2853. HA: NN fails to start if the shared edits dir is marked required (atm via eli)
+
+HDFS-2845. SBN should not allow browsing of the file system via web UI. (Bikas Saha via atm)

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/corrupt_files.jsp

@@ -23,6 +23,7 @@
 	import="org.apache.hadoop.fs.FileStatus"
 	import="org.apache.hadoop.fs.FileUtil"
 	import="org.apache.hadoop.fs.Path"
+	import="org.apache.hadoop.ha.HAServiceProtocol.HAServiceState"
 	import="java.util.Collection"
 	import="java.util.Arrays" %>
 <%!//for java.io.Serializable
@@ -30,6 +31,8 @@
 <%
   NameNode nn = NameNodeHttpServer.getNameNodeFromContext(application);
   FSNamesystem fsn = nn.getNamesystem();
+  HAServiceState nnHAState = nn.getServiceState();
+  boolean isActive = (nnHAState == HAServiceState.ACTIVE);
   String namenodeRole = nn.getRole().toString();
   String namenodeLabel = nn.getNameNodeAddress().getHostName() + ":"
       + nn.getNameNodeAddress().getPort();
@@ -46,8 +49,10 @@
 <h1><%=namenodeRole%> '<%=namenodeLabel%>'</h1>
 <%=NamenodeJspHelper.getVersionTable(fsn)%>
 <br>
-<b><a href="/nn_browsedfscontent.jsp">Browse the filesystem</a></b>
-<br>
+<% if (isActive) { %> 
+  <b><a href="/nn_browsedfscontent.jsp">Browse the filesystem</a></b>
+  <br>
+<% } %> 
 <b><a href="/logs/"><%=namenodeRole%> Logs</a></b>
 <br>
 <b><a href=/dfshealth.jsp> Go back to DFS home</a></b>

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/dfshealth.jsp

@@ -30,8 +30,10 @@
   final NamenodeJspHelper.HealthJsp healthjsp  = new NamenodeJspHelper.HealthJsp();
   NameNode nn = NameNodeHttpServer.getNameNodeFromContext(application);
   FSNamesystem fsn = nn.getNamesystem();
+  HAServiceState nnHAState = nn.getServiceState();
+  boolean isActive = (nnHAState == HAServiceState.ACTIVE);
   String namenodeRole = nn.getRole().toString();
-  String namenodeState = nn.getServiceState().toString();
+  String namenodeState = nnHAState.toString();
   String namenodeLabel = nn.getNameNodeAddress().getHostName() + ":" + nn.getNameNodeAddress().getPort();
 %>
 
@@ -45,7 +47,9 @@
 <h1><%=namenodeRole%> '<%=namenodeLabel%>' (<%=namenodeState%>)</h1>
 <%= NamenodeJspHelper.getVersionTable(fsn) %>
 <br />
-<b><a href="/nn_browsedfscontent.jsp">Browse the filesystem</a></b><br>
+<% if (isActive) { %> 
+  <b><a href="/nn_browsedfscontent.jsp">Browse the filesystem</a></b><br>
+<% } %> 
 <b><a href="/logs/"><%=namenodeRole%> Logs</a></b>
 
 <hr>

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/dfsnodelist.jsp

@@ -20,6 +20,7 @@
 <%@ page
   contentType="text/html; charset=UTF-8"
   import="org.apache.hadoop.util.ServletUtil"
+  import="org.apache.hadoop.ha.HAServiceProtocol.HAServiceState"
 %>
 <%!
   //for java.io.Serializable
@@ -30,6 +31,8 @@ final NamenodeJspHelper.NodeListJsp nodelistjsp = new NamenodeJspHelper.NodeList
 NameNode nn = NameNodeHttpServer.getNameNodeFromContext(application);
 String namenodeRole = nn.getRole().toString();
 FSNamesystem fsn = nn.getNamesystem();
+HAServiceState nnHAState = nn.getServiceState();
+boolean isActive = (nnHAState == HAServiceState.ACTIVE);
 String namenodeLabel = nn.getNameNodeAddress().getHostName() + ":" + nn.getNameNodeAddress().getPort();
 %>
 
@@ -43,7 +46,9 @@ String namenodeLabel = nn.getNameNodeAddress().getHostName() + ":" + nn.getNameN
 <h1><%=namenodeRole%> '<%=namenodeLabel%>'</h1>
 <%= NamenodeJspHelper.getVersionTable(fsn) %>
 <br />
-<b><a href="/nn_browsedfscontent.jsp">Browse the filesystem</a></b><br>
+<% if (isActive) { %> 
+  <b><a href="/nn_browsedfscontent.jsp">Browse the filesystem</a></b><br>
+<% } %> 
 <b><a href="/logs/"><%=namenodeRole%> Logs</a></b><br>
 <b><a href=/dfshealth.jsp> Go back to DFS home</a></b>
 <hr>

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestHAWebUI.java

@@ -0,0 +1,70 @@
+/**
+ * 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.ha;
+
+import static org.junit.Assert.*;
+
+import java.net.URL;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.MiniDFSNNTopology;
+import org.apache.hadoop.hdfs.server.namenode.NameNode;
+import org.junit.Test;
+
+public class TestHAWebUI {
+
+  /**
+   * Tests that the web UI of the name node provides a link to browse the file
+   * system only in active state
+   * 
+   */
+  @Test
+  public void testLinkToBrowseFilesystem() throws Exception {
+    Configuration conf = new Configuration();
+
+    MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
+        .nnTopology(MiniDFSNNTopology.simpleHATopology()).numDataNodes(0)
+        .build();
+    try {
+      cluster.waitActive();
+
+      cluster.transitionToActive(0);
+      String pageContents = DFSTestUtil.urlGet(new URL("http://localhost:"
+          + NameNode.getHttpAddress(cluster.getConfiguration(0)).getPort()
+          + "/dfshealth.jsp"));
+      assertTrue(pageContents.contains("Browse the filesystem"));
+
+      cluster.transitionToStandby(0);
+      pageContents = DFSTestUtil.urlGet(new URL("http://localhost:"
+          + NameNode.getHttpAddress(cluster.getConfiguration(0)).getPort()
+          + "/dfshealth.jsp"));
+      assertFalse(pageContents.contains("Browse the filesystem"));
+
+      cluster.transitionToActive(0);
+      pageContents = DFSTestUtil.urlGet(new URL("http://localhost:"
+          + NameNode.getHttpAddress(cluster.getConfiguration(0)).getPort()
+          + "/dfshealth.jsp"));
+      assertTrue(pageContents.contains("Browse the filesystem"));
+
+    } finally {
+      cluster.shutdown();
+    }
+  }
+}