HDFS-4983. Numeric usernames do not work with WebHDFS FS. Contributed by Yongjun Zhang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1548968 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -584,6 +584,9 @@ Release 2.4.0 - UNRELEASED
 
     HDFS-5633. Improve OfflineImageViewer to use less memory. (jing9)
 
+    HDFS-4983. Numeric usernames do not work with WebHDFS FS. (Yongjun Zhang via
+    jing9)
+
   OPTIMIZATIONS
 
     HDFS-5239.  Allow FSNamesystem lock fairness to be configurable (daryn)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java

@@ -164,6 +164,8 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   public static final int     DFS_NAMENODE_REPLICATION_STREAMS_HARD_LIMIT_DEFAULT = 4;
   public static final String  DFS_WEBHDFS_ENABLED_KEY = "dfs.webhdfs.enabled";
   public static final boolean DFS_WEBHDFS_ENABLED_DEFAULT = true;
+  public static final String  DFS_WEBHDFS_USER_PATTERN_KEY = "dfs.webhdfs.user.provider.user.pattern";
+  public static final String  DFS_WEBHDFS_USER_PATTERN_DEFAULT = "^[A-Za-z_][A-Za-z0-9._-]*[$]?$";
   public static final String  DFS_PERMISSIONS_ENABLED_KEY = "dfs.permissions.enabled";
   public static final boolean DFS_PERMISSIONS_ENABLED_DEFAULT = true;
   public static final String  DFS_PERMISSIONS_SUPERUSERGROUP_KEY = "dfs.permissions.superusergroup";

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeHttpServer.java

@@ -39,6 +39,7 @@
 import org.apache.hadoop.hdfs.web.AuthFilter;
 import org.apache.hadoop.hdfs.web.WebHdfsFileSystem;
 import org.apache.hadoop.hdfs.web.resources.Param;
+import org.apache.hadoop.hdfs.web.resources.UserParam;
 import org.apache.hadoop.http.HttpConfig;
 import org.apache.hadoop.http.HttpServer;
 import org.apache.hadoop.net.NetUtils;
@@ -73,7 +74,10 @@ public class NameNodeHttpServer {
 
   private void initWebHdfs(Configuration conf) throws IOException {
     if (WebHdfsFileSystem.isEnabled(conf, HttpServer.LOG)) {
-      //add SPNEGO authentication filter for webhdfs
+      // set user pattern based on configuration file
+      UserParam.setUserPattern(conf.get(DFSConfigKeys.DFS_WEBHDFS_USER_PATTERN_KEY, DFSConfigKeys.DFS_WEBHDFS_USER_PATTERN_DEFAULT));
+
+      // add SPNEGO authentication filter for webhdfs
       final String name = "SPNEGO";
       final String classname = AuthFilter.class.getName();
       final String pathSpec = WebHdfsFileSystem.PATH_PREFIX + "/*";

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java

@@ -157,6 +157,8 @@ public synchronized void initialize(URI uri, Configuration conf
       ) throws IOException {
     super.initialize(uri, conf);
     setConf(conf);
+    /** set user pattern based on configuration file */
+    UserParam.setUserPattern(conf.get(DFSConfigKeys.DFS_WEBHDFS_USER_PATTERN_KEY, DFSConfigKeys.DFS_WEBHDFS_USER_PATTERN_DEFAULT));
     connectionFactory = URLConnectionFactory
         .newDefaultURLConnectionFactory(conf);
     initializeTokenAspect();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/resources/UserParam.java

@@ -17,7 +17,9 @@
  */
 package org.apache.hadoop.hdfs.web.resources;
 
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_WEBHDFS_USER_PATTERN_DEFAULT;
 import org.apache.hadoop.security.UserGroupInformation;
+import com.google.common.annotations.VisibleForTesting;
  
 import java.text.MessageFormat;
 import java.util.regex.Pattern;
@@ -29,8 +31,21 @@ public class UserParam extends StringParam {
   /** Default parameter value. */
   public static final String DEFAULT = "";
 
-  private static final Domain DOMAIN = new Domain(NAME,
+  private static Domain domain = new Domain(NAME, Pattern.compile(DFS_WEBHDFS_USER_PATTERN_DEFAULT));
-    Pattern.compile("^[A-Za-z_][A-Za-z0-9._-]*[$]?$"));
+
+  @VisibleForTesting
+  public static Domain getUserPatternDomain() {
+    return domain;
+  }
+
+  @VisibleForTesting
+  public static void setUserPatternDomain(Domain dm) {
+    domain = dm;
+  }
+
+  public static void setUserPattern(String pattern) {
+    domain = new Domain(NAME, Pattern.compile(pattern));
+  }
 
   private static String validateLength(String str) {
     if (str == null) {
@@ -50,7 +65,7 @@ private static String validateLength(String str) {
    * @param str a string representation of the parameter value.
    */
   public UserParam(final String str) {
-    super(DOMAIN, str == null || str.equals(DEFAULT)? null : validateLength(str));
+    super(domain, str == null || str.equals(DEFAULT)? null : validateLength(str));
   }
 
   /**

hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml

@@ -1593,4 +1593,12 @@
   </description>
 </property>
 
+<property>
+  <name>dfs.webhdfs.user.provider.user.pattern</name>
+  <value>^[A-Za-z_][A-Za-z0-9._-]*[$]?$</value>
+  <description>
+    Valid pattern for user and group names for webhdfs, it must be a valid java regex.
+  </description>
+</property>
+
 </configuration>

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFS.java

@@ -261,6 +261,34 @@ public Void run() throws IOException, URISyntaxException {
     }
   }
 
+  @Test(timeout=300000)
+  public void testNumericalUserName() throws Exception {
+    final Configuration conf = WebHdfsTestUtil.createConf();
+    conf.set(DFSConfigKeys.DFS_WEBHDFS_USER_PATTERN_KEY, "^[A-Za-z0-9_][A-Za-z0-9._-]*[$]?$");
+    final MiniDFSCluster cluster =
+        new MiniDFSCluster.Builder(conf).numDataNodes(1).build();
+    try {
+      cluster.waitActive();
+      WebHdfsTestUtil.getWebHdfsFileSystem(conf, WebHdfsFileSystem.SCHEME)
+          .setPermission(new Path("/"),
+              new FsPermission(FsAction.ALL, FsAction.ALL, FsAction.ALL));
+
+      UserGroupInformation.createUserForTesting("123", new String[]{"my-group"})
+        .doAs(new PrivilegedExceptionAction<Void>() {
+          @Override
+          public Void run() throws IOException, URISyntaxException {
+            FileSystem fs = WebHdfsTestUtil.getWebHdfsFileSystem(conf,
+                WebHdfsFileSystem.SCHEME);
+            Path d = new Path("/my-dir");
+            Assert.assertTrue(fs.mkdirs(d));
+            return null;
+          }
+        });
+    } finally {
+      cluster.shutdown();
+    }
+  }
+
   /**
    * WebHdfs should be enabled by default after HDFS-5532
    * 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/resources/TestParam.java

@@ -285,4 +285,19 @@ public void testConcatSourcesParam() {
       Assert.assertEquals(expected, computed.getValue());
     }
   }
+
+  @Test
+  public void testUserNameOkAfterResettingPattern() {
+    UserParam.Domain oldDomain = UserParam.getUserPatternDomain();
+
+    String newPattern = "^[A-Za-z0-9_][A-Za-z0-9._-]*[$]?$";
+    UserParam.setUserPattern(newPattern);
+
+    UserParam userParam = new UserParam("1x");
+    assertNotNull(userParam.getValue());
+    userParam = new UserParam("123");
+    assertNotNull(userParam.getValue());
+
+    UserParam.setUserPatternDomain(oldDomain);
+  }
 }