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From a...@apache.org
Subject [7/8] hbase git commit: HBASE-19053 Split out o.a.h.h.http from hbase-server into a separate module
Date Tue, 24 Oct 2017 06:25:20 GMT
http://git-wip-us.apache.org/repos/asf/hbase/blob/3969b853/hbase-http/src/main/java/org/apache/hadoop/hbase/http/HttpServer.java
----------------------------------------------------------------------
diff --git a/hbase-http/src/main/java/org/apache/hadoop/hbase/http/HttpServer.java b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/HttpServer.java
new file mode 100644
index 0000000..726595b
--- /dev/null
+++ b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/HttpServer.java
@@ -0,0 +1,1380 @@
+/**
+ * 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.hbase.http;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InterruptedIOException;
+import java.io.PrintStream;
+import java.net.BindException;
+import java.net.InetSocketAddress;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletRequestWrapper;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.HadoopIllegalArgumentException;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.apache.yetus.audience.InterfaceStability;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.CommonConfigurationKeys;
+import org.apache.hadoop.hbase.HBaseInterfaceAudience;
+import org.apache.hadoop.hbase.http.conf.ConfServlet;
+import org.apache.hadoop.hbase.http.jmx.JMXJsonServlet;
+import org.apache.hadoop.hbase.http.log.LogLevel;
+import org.apache.hadoop.hbase.util.Threads;
+import org.apache.hadoop.hbase.util.ReflectionUtils;
+import org.apache.hadoop.security.SecurityUtil;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.authentication.server.AuthenticationFilter;
+import org.apache.hadoop.security.authorize.AccessControlList;
+import org.apache.hadoop.util.Shell;
+
+import org.eclipse.jetty.http.HttpVersion;
+import org.eclipse.jetty.server.Server;
+import org.eclipse.jetty.server.Handler;
+import org.eclipse.jetty.server.HttpConfiguration;
+import org.eclipse.jetty.server.HttpConnectionFactory;
+import org.eclipse.jetty.server.ServerConnector;
+import org.eclipse.jetty.server.SecureRequestCustomizer;
+import org.eclipse.jetty.server.SslConnectionFactory;
+import org.eclipse.jetty.server.handler.ContextHandlerCollection;
+import org.eclipse.jetty.server.handler.HandlerCollection;
+import org.eclipse.jetty.server.RequestLog;
+import org.eclipse.jetty.server.handler.RequestLogHandler;
+import org.eclipse.jetty.servlet.FilterMapping;
+import org.eclipse.jetty.servlet.ServletHandler;
+import org.eclipse.jetty.servlet.FilterHolder;
+import org.eclipse.jetty.servlet.ServletContextHandler;
+import org.eclipse.jetty.servlet.DefaultServlet;
+import org.eclipse.jetty.servlet.ServletHolder;
+import org.eclipse.jetty.util.MultiException;
+import org.eclipse.jetty.util.ssl.SslContextFactory;
+import org.eclipse.jetty.util.thread.QueuedThreadPool;
+import org.eclipse.jetty.webapp.WebAppContext;
+
+import org.glassfish.jersey.server.ResourceConfig;
+import org.glassfish.jersey.servlet.ServletContainer;
+
+import org.apache.hadoop.hbase.shaded.com.google.common.base.Preconditions;
+import org.apache.hadoop.hbase.shaded.com.google.common.collect.Lists;
+
+/**
+ * Create a Jetty embedded server to answer http requests. The primary goal
+ * is to serve up status information for the server.
+ * There are three contexts:
+ *   "/logs/" -> points to the log directory
+ *   "/static/" -> points to common static files (src/webapps/static)
+ *   "/" -> the jsp server code from (src/webapps/<name>)
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Evolving
+public class HttpServer implements FilterContainer {
+  private static final Log LOG = LogFactory.getLog(HttpServer.class);
+  private static final String EMPTY_STRING = "";
+
+  private static final int DEFAULT_MAX_HEADER_SIZE = 64 * 1024; // 64K
+
+  static final String FILTER_INITIALIZERS_PROPERTY
+      = "hbase.http.filter.initializers";
+  static final String HTTP_MAX_THREADS = "hbase.http.max.threads";
+
+  public static final String HTTP_UI_AUTHENTICATION = "hbase.security.authentication.ui";
+  static final String HTTP_AUTHENTICATION_PREFIX = "hbase.security.authentication.";
+  static final String HTTP_SPNEGO_AUTHENTICATION_PREFIX = HTTP_AUTHENTICATION_PREFIX
+      + "spnego.";
+  static final String HTTP_SPNEGO_AUTHENTICATION_PRINCIPAL_SUFFIX = "kerberos.principal";
+  public static final String HTTP_SPNEGO_AUTHENTICATION_PRINCIPAL_KEY =
+      HTTP_SPNEGO_AUTHENTICATION_PREFIX + HTTP_SPNEGO_AUTHENTICATION_PRINCIPAL_SUFFIX;
+  static final String HTTP_SPNEGO_AUTHENTICATION_KEYTAB_SUFFIX = "kerberos.keytab";
+  public static final String HTTP_SPNEGO_AUTHENTICATION_KEYTAB_KEY =
+      HTTP_SPNEGO_AUTHENTICATION_PREFIX + HTTP_SPNEGO_AUTHENTICATION_KEYTAB_SUFFIX;
+  static final String HTTP_SPNEGO_AUTHENTICATION_KRB_NAME_SUFFIX = "kerberos.name.rules";
+  public static final String HTTP_SPNEGO_AUTHENTICATION_KRB_NAME_KEY =
+      HTTP_SPNEGO_AUTHENTICATION_PREFIX + HTTP_SPNEGO_AUTHENTICATION_KRB_NAME_SUFFIX;
+  static final String HTTP_AUTHENTICATION_SIGNATURE_SECRET_FILE_SUFFIX =
+      "signature.secret.file";
+  public static final String HTTP_AUTHENTICATION_SIGNATURE_SECRET_FILE_KEY =
+      HTTP_AUTHENTICATION_PREFIX + HTTP_AUTHENTICATION_SIGNATURE_SECRET_FILE_SUFFIX;
+
+  // The ServletContext attribute where the daemon Configuration
+  // gets stored.
+  public static final String CONF_CONTEXT_ATTRIBUTE = "hbase.conf";
+  public static final String ADMINS_ACL = "admins.acl";
+  public static final String BIND_ADDRESS = "bind.address";
+  public static final String SPNEGO_FILTER = "SpnegoFilter";
+  public static final String NO_CACHE_FILTER = "NoCacheFilter";
+  public static final String APP_DIR = "webapps";
+
+  private final AccessControlList adminsAcl;
+
+  protected final Server webServer;
+  protected String appDir;
+  protected String logDir;
+
+  private static class ListenerInfo {
+    /**
+     * Boolean flag to determine whether the HTTP server should clean up the
+     * listener in stop().
+     */
+    private final boolean isManaged;
+    private final ServerConnector listener;
+    private ListenerInfo(boolean isManaged, ServerConnector listener) {
+      this.isManaged = isManaged;
+      this.listener = listener;
+    }
+  }
+
+  private final List<ListenerInfo> listeners = Lists.newArrayList();
+
+  protected final WebAppContext webAppContext;
+  protected final boolean findPort;
+  protected final Map<ServletContextHandler, Boolean> defaultContexts = new HashMap<>();
+  protected final List<String> filterNames = new ArrayList<>();
+  static final String STATE_DESCRIPTION_ALIVE = " - alive";
+  static final String STATE_DESCRIPTION_NOT_LIVE = " - not live";
+
+  /**
+   * Class to construct instances of HTTP server with specific options.
+   */
+  public static class Builder {
+    private ArrayList<URI> endpoints = Lists.newArrayList();
+    private Configuration conf;
+    private String[] pathSpecs;
+    private AccessControlList adminsAcl;
+    private boolean securityEnabled = false;
+    private String usernameConfKey;
+    private String keytabConfKey;
+    private boolean needsClientAuth;
+
+    private String hostName;
+    private String appDir = APP_DIR;
+    private String logDir;
+    private boolean findPort;
+
+    private String trustStore;
+    private String trustStorePassword;
+    private String trustStoreType;
+
+    private String keyStore;
+    private String keyStorePassword;
+    private String keyStoreType;
+
+    // The -keypass option in keytool
+    private String keyPassword;
+
+    private String kerberosNameRulesKey;
+    private String signatureSecretFileKey;
+
+    @Deprecated
+    private String name;
+    @Deprecated
+    private String bindAddress;
+    @Deprecated
+    private int port = -1;
+
+    /**
+     * Add an endpoint that the HTTP server should listen to.
+     *
+     * @param endpoint
+     *          the endpoint of that the HTTP server should listen to. The
+     *          scheme specifies the protocol (i.e. HTTP / HTTPS), the host
+     *          specifies the binding address, and the port specifies the
+     *          listening port. Unspecified or zero port means that the server
+     *          can listen to any port.
+     */
+    public Builder addEndpoint(URI endpoint) {
+      endpoints.add(endpoint);
+      return this;
+    }
+
+    /**
+     * Set the hostname of the http server. The host name is used to resolve the
+     * _HOST field in Kerberos principals. The hostname of the first listener
+     * will be used if the name is unspecified.
+     */
+    public Builder hostName(String hostName) {
+      this.hostName = hostName;
+      return this;
+    }
+
+    public Builder trustStore(String location, String password, String type) {
+      this.trustStore = location;
+      this.trustStorePassword = password;
+      this.trustStoreType = type;
+      return this;
+    }
+
+    public Builder keyStore(String location, String password, String type) {
+      this.keyStore = location;
+      this.keyStorePassword = password;
+      this.keyStoreType = type;
+      return this;
+    }
+
+    public Builder keyPassword(String password) {
+      this.keyPassword = password;
+      return this;
+    }
+
+    /**
+     * Specify whether the server should authorize the client in SSL
+     * connections.
+     */
+    public Builder needsClientAuth(boolean value) {
+      this.needsClientAuth = value;
+      return this;
+    }
+
+    /**
+     * Use setAppDir() instead.
+     */
+    @Deprecated
+    public Builder setName(String name){
+      this.name = name;
+      return this;
+    }
+
+    /**
+     * Use addEndpoint() instead.
+     */
+    @Deprecated
+    public Builder setBindAddress(String bindAddress){
+      this.bindAddress = bindAddress;
+      return this;
+    }
+
+    /**
+     * Use addEndpoint() instead.
+     */
+    @Deprecated
+    public Builder setPort(int port) {
+      this.port = port;
+      return this;
+    }
+
+    public Builder setFindPort(boolean findPort) {
+      this.findPort = findPort;
+      return this;
+    }
+
+    public Builder setConf(Configuration conf) {
+      this.conf = conf;
+      return this;
+    }
+
+    public Builder setPathSpec(String[] pathSpec) {
+      this.pathSpecs = pathSpec;
+      return this;
+    }
+
+    public Builder setACL(AccessControlList acl) {
+      this.adminsAcl = acl;
+      return this;
+    }
+
+    public Builder setSecurityEnabled(boolean securityEnabled) {
+      this.securityEnabled = securityEnabled;
+      return this;
+    }
+
+    public Builder setUsernameConfKey(String usernameConfKey) {
+      this.usernameConfKey = usernameConfKey;
+      return this;
+    }
+
+    public Builder setKeytabConfKey(String keytabConfKey) {
+      this.keytabConfKey = keytabConfKey;
+      return this;
+    }
+
+    public Builder setKerberosNameRulesKey(String kerberosNameRulesKey) {
+      this.kerberosNameRulesKey = kerberosNameRulesKey;
+      return this;
+    }
+
+    public Builder setSignatureSecretFileKey(String signatureSecretFileKey) {
+      this.signatureSecretFileKey = signatureSecretFileKey;
+      return this;
+    }
+
+    public Builder setAppDir(String appDir) {
+        this.appDir = appDir;
+        return this;
+      }
+
+    public Builder setLogDir(String logDir) {
+        this.logDir = logDir;
+        return this;
+      }
+
+    public HttpServer build() throws IOException {
+
+      // Do we still need to assert this non null name if it is deprecated?
+      if (this.name == null) {
+        throw new HadoopIllegalArgumentException("name is not set");
+      }
+
+      // Make the behavior compatible with deprecated interfaces
+      if (bindAddress != null && port != -1) {
+        try {
+          endpoints.add(0, new URI("http", "", bindAddress, port, "", "", ""));
+        } catch (URISyntaxException e) {
+          throw new HadoopIllegalArgumentException("Invalid endpoint: "+ e); }
+      }
+
+      if (endpoints.isEmpty()) {
+        throw new HadoopIllegalArgumentException("No endpoints specified");
+      }
+
+      if (hostName == null) {
+        hostName = endpoints.get(0).getHost();
+      }
+
+      if (this.conf == null) {
+        conf = new Configuration();
+      }
+
+      HttpServer server = new HttpServer(this);
+
+      if (this.securityEnabled) {
+        server.initSpnego(conf, hostName, usernameConfKey, keytabConfKey, kerberosNameRulesKey,
+            signatureSecretFileKey);
+      }
+
+      for (URI ep : endpoints) {
+        ServerConnector listener = null;
+        String scheme = ep.getScheme();
+        HttpConfiguration httpConfig = new HttpConfiguration();
+        httpConfig.setSecureScheme("https");
+        httpConfig.setHeaderCacheSize(DEFAULT_MAX_HEADER_SIZE);
+        httpConfig.setResponseHeaderSize(DEFAULT_MAX_HEADER_SIZE);
+        httpConfig.setRequestHeaderSize(DEFAULT_MAX_HEADER_SIZE);
+
+        if ("http".equals(scheme)) {
+          listener = new ServerConnector(server.webServer, new HttpConnectionFactory(httpConfig));
+        } else if ("https".equals(scheme)) {
+          HttpConfiguration httpsConfig = new HttpConfiguration(httpConfig);
+          httpsConfig.addCustomizer(new SecureRequestCustomizer());
+          SslContextFactory sslCtxFactory = new SslContextFactory();
+          sslCtxFactory.setNeedClientAuth(needsClientAuth);
+          sslCtxFactory.setKeyManagerPassword(keyPassword);
+
+          if (keyStore != null) {
+            sslCtxFactory.setKeyStorePath(keyStore);
+            sslCtxFactory.setKeyStoreType(keyStoreType);
+            sslCtxFactory.setKeyStorePassword(keyStorePassword);
+          }
+
+          if (trustStore != null) {
+            sslCtxFactory.setTrustStorePath(trustStore);
+            sslCtxFactory.setTrustStoreType(trustStoreType);
+            sslCtxFactory.setTrustStorePassword(trustStorePassword);
+
+          }
+          listener = new ServerConnector(server.webServer, new SslConnectionFactory(sslCtxFactory,
+              HttpVersion.HTTP_1_1.toString()), new HttpConnectionFactory(httpsConfig));
+        } else {
+          throw new HadoopIllegalArgumentException(
+              "unknown scheme for endpoint:" + ep);
+        }
+
+        // default settings for connector
+        listener.setAcceptQueueSize(128);
+        if (Shell.WINDOWS) {
+          // result of setting the SO_REUSEADDR flag is different on Windows
+          // http://msdn.microsoft.com/en-us/library/ms740621(v=vs.85).aspx
+          // without this 2 NN's can start on the same machine and listen on
+          // the same port with indeterminate routing of incoming requests to them
+          listener.setReuseAddress(false);
+        }
+
+        listener.setHost(ep.getHost());
+        listener.setPort(ep.getPort() == -1 ? 0 : ep.getPort());
+        server.addManagedListener(listener);
+      }
+
+      server.loadListeners();
+      return server;
+
+    }
+
+  }
+
+  /** Same as this(name, bindAddress, port, findPort, null); */
+  @Deprecated
+  public HttpServer(String name, String bindAddress, int port, boolean findPort
+      ) throws IOException {
+    this(name, bindAddress, port, findPort, new Configuration());
+  }
+
+  /**
+   * Create a status server on the given port. Allows you to specify the
+   * path specifications that this server will be serving so that they will be
+   * added to the filters properly.
+   *
+   * @param name The name of the server
+   * @param bindAddress The address for this server
+   * @param port The port to use on the server
+   * @param findPort whether the server should start at the given port and
+   *        increment by 1 until it finds a free port.
+   * @param conf Configuration
+   * @param pathSpecs Path specifications that this httpserver will be serving.
+   *        These will be added to any filters.
+   */
+  @Deprecated
+  public HttpServer(String name, String bindAddress, int port,
+      boolean findPort, Configuration conf, String[] pathSpecs) throws IOException {
+    this(name, bindAddress, port, findPort, conf, null, pathSpecs);
+  }
+
+  /**
+   * Create a status server on the given port.
+   * The jsp scripts are taken from src/webapps/&lt;name&gt;.
+   * @param name The name of the server
+   * @param port The port to use on the server
+   * @param findPort whether the server should start at the given port and
+   *        increment by 1 until it finds a free port.
+   * @param conf Configuration
+   */
+  @Deprecated
+  public HttpServer(String name, String bindAddress, int port,
+      boolean findPort, Configuration conf) throws IOException {
+    this(name, bindAddress, port, findPort, conf, null, null);
+  }
+
+  @Deprecated
+  public HttpServer(String name, String bindAddress, int port,
+      boolean findPort, Configuration conf, AccessControlList adminsAcl)
+      throws IOException {
+    this(name, bindAddress, port, findPort, conf, adminsAcl, null);
+  }
+
+  /**
+   * Create a status server on the given port.
+   * The jsp scripts are taken from src/webapps/&lt;name&gt;.
+   * @param name The name of the server
+   * @param bindAddress The address for this server
+   * @param port The port to use on the server
+   * @param findPort whether the server should start at the given port and
+   *        increment by 1 until it finds a free port.
+   * @param conf Configuration
+   * @param adminsAcl {@link AccessControlList} of the admins
+   * @param pathSpecs Path specifications that this httpserver will be serving.
+   *        These will be added to any filters.
+   */
+  @Deprecated
+  public HttpServer(String name, String bindAddress, int port,
+      boolean findPort, Configuration conf, AccessControlList adminsAcl,
+      String[] pathSpecs) throws IOException {
+    this(new Builder().setName(name)
+        .addEndpoint(URI.create("http://" + bindAddress + ":" + port))
+        .setFindPort(findPort).setConf(conf).setACL(adminsAcl)
+        .setPathSpec(pathSpecs));
+  }
+
+  private HttpServer(final Builder b) throws IOException {
+    this.appDir = b.appDir;
+    this.logDir = b.logDir;
+    final String appDir = getWebAppsPath(b.name);
+
+
+    int maxThreads = b.conf.getInt(HTTP_MAX_THREADS, 16);
+    // If HTTP_MAX_THREADS is less than or equal to 0, QueueThreadPool() will use the
+    // default value (currently 200).
+    QueuedThreadPool threadPool = maxThreads <= 0 ? new QueuedThreadPool()
+        : new QueuedThreadPool(maxThreads);
+    threadPool.setDaemon(true);
+    this.webServer = new Server(threadPool);
+
+    this.adminsAcl = b.adminsAcl;
+    this.webAppContext = createWebAppContext(b.name, b.conf, adminsAcl, appDir);
+    this.findPort = b.findPort;
+    initializeWebServer(b.name, b.hostName, b.conf, b.pathSpecs);
+  }
+
+  private void initializeWebServer(String name, String hostName,
+      Configuration conf, String[] pathSpecs)
+      throws FileNotFoundException, IOException {
+
+    Preconditions.checkNotNull(webAppContext);
+
+    HandlerCollection handlerCollection = new HandlerCollection();
+
+    ContextHandlerCollection contexts = new ContextHandlerCollection();
+    RequestLog requestLog = HttpRequestLog.getRequestLog(name);
+
+    if (requestLog != null) {
+      RequestLogHandler requestLogHandler = new RequestLogHandler();
+      requestLogHandler.setRequestLog(requestLog);
+      handlerCollection.addHandler(requestLogHandler);
+    }
+
+    final String appDir = getWebAppsPath(name);
+
+    handlerCollection.addHandler(contexts);
+    handlerCollection.addHandler(webAppContext);
+
+    webServer.setHandler(handlerCollection);
+
+    addDefaultApps(contexts, appDir, conf);
+
+    addGlobalFilter("safety", QuotingInputFilter.class.getName(), null);
+    Map<String, String> params = new HashMap<>();
+    params.put("xframeoptions", conf.get("hbase.http.filter.xframeoptions.mode", "DENY"));
+    addGlobalFilter("clickjackingprevention",
+            ClickjackingPreventionFilter.class.getName(), params);
+    final FilterInitializer[] initializers = getFilterInitializers(conf);
+    if (initializers != null) {
+      conf = new Configuration(conf);
+      conf.set(BIND_ADDRESS, hostName);
+      for (FilterInitializer c : initializers) {
+        c.initFilter(this, conf);
+      }
+    }
+
+    addDefaultServlets();
+
+    if (pathSpecs != null) {
+      for (String path : pathSpecs) {
+        LOG.info("adding path spec: " + path);
+        addFilterPathMapping(path, webAppContext);
+      }
+    }
+  }
+
+  private void addManagedListener(ServerConnector connector) {
+    listeners.add(new ListenerInfo(true, connector));
+  }
+
+  private static WebAppContext createWebAppContext(String name,
+      Configuration conf, AccessControlList adminsAcl, final String appDir) {
+    WebAppContext ctx = new WebAppContext();
+    ctx.setDisplayName(name);
+    ctx.setContextPath("/");
+    ctx.setWar(appDir + "/" + name);
+    ctx.getServletContext().setAttribute(CONF_CONTEXT_ATTRIBUTE, conf);
+    ctx.getServletContext().setAttribute(ADMINS_ACL, adminsAcl);
+    addNoCacheFilter(ctx);
+    return ctx;
+  }
+
+  private static void addNoCacheFilter(WebAppContext ctxt) {
+    defineFilter(ctxt, NO_CACHE_FILTER, NoCacheFilter.class.getName(),
+        Collections.<String, String> emptyMap(), new String[] { "/*" });
+  }
+
+  /** Get an array of FilterConfiguration specified in the conf */
+  private static FilterInitializer[] getFilterInitializers(Configuration conf) {
+    if (conf == null) {
+      return null;
+    }
+
+    Class<?>[] classes = conf.getClasses(FILTER_INITIALIZERS_PROPERTY);
+    if (classes == null) {
+      return null;
+    }
+
+    FilterInitializer[] initializers = new FilterInitializer[classes.length];
+    for(int i = 0; i < classes.length; i++) {
+      initializers[i] = (FilterInitializer)ReflectionUtils.newInstance(classes[i]);
+    }
+    return initializers;
+  }
+
+  /**
+   * Add default apps.
+   * @param appDir The application directory
+   * @throws IOException
+   */
+  protected void addDefaultApps(ContextHandlerCollection parent,
+      final String appDir, Configuration conf) throws IOException {
+    // set up the context for "/logs/" if "hadoop.log.dir" property is defined.
+    String logDir = this.logDir;
+    if (logDir == null) {
+        logDir = System.getProperty("hadoop.log.dir");
+    }
+    if (logDir != null) {
+      ServletContextHandler logContext = new ServletContextHandler(parent, "/logs");
+      logContext.addServlet(AdminAuthorizedServlet.class, "/*");
+      logContext.setResourceBase(logDir);
+
+      if (conf.getBoolean(
+          ServerConfigurationKeys.HBASE_JETTY_LOGS_SERVE_ALIASES,
+          ServerConfigurationKeys.DEFAULT_HBASE_JETTY_LOGS_SERVE_ALIASES)) {
+        Map<String, String> params = logContext.getInitParams();
+        params.put(
+            "org.mortbay.jetty.servlet.Default.aliases", "true");
+      }
+      logContext.setDisplayName("logs");
+      setContextAttributes(logContext, conf);
+      addNoCacheFilter(webAppContext);
+      defaultContexts.put(logContext, true);
+    }
+    // set up the context for "/static/*"
+    ServletContextHandler staticContext = new ServletContextHandler(parent, "/static");
+    staticContext.setResourceBase(appDir + "/static");
+    staticContext.addServlet(DefaultServlet.class, "/*");
+    staticContext.setDisplayName("static");
+    setContextAttributes(staticContext, conf);
+    defaultContexts.put(staticContext, true);
+  }
+
+  private void setContextAttributes(ServletContextHandler context, Configuration conf) {
+    context.getServletContext().setAttribute(CONF_CONTEXT_ATTRIBUTE, conf);
+    context.getServletContext().setAttribute(ADMINS_ACL, adminsAcl);
+  }
+
+  /**
+   * Add default servlets.
+   */
+  protected void addDefaultServlets() {
+    // set up default servlets
+    addServlet("stacks", "/stacks", StackServlet.class);
+    addServlet("logLevel", "/logLevel", LogLevel.Servlet.class);
+
+    // Hadoop3 has moved completely to metrics2, and  dropped support for Metrics v1's
+    // MetricsServlet (see HADOOP-12504).  We'll using reflection to load if against hadoop2.
+    // Remove when we drop support for hbase on hadoop2.x.
+    try {
+      Class clz = Class.forName("org.apache.hadoop.metrics.MetricsServlet");
+      addServlet("metrics", "/metrics", clz);
+    } catch (Exception e) {
+      // do nothing
+    }
+
+    addServlet("jmx", "/jmx", JMXJsonServlet.class);
+    addServlet("conf", "/conf", ConfServlet.class);
+  }
+
+  /**
+   * Set a value in the webapp context. These values are available to the jsp
+   * pages as "application.getAttribute(name)".
+   * @param name The name of the attribute
+   * @param value The value of the attribute
+   */
+  public void setAttribute(String name, Object value) {
+    webAppContext.setAttribute(name, value);
+  }
+
+  /**
+   * Add a Jersey resource package.
+   * @param packageName The Java package name containing the Jersey resource.
+   * @param pathSpec The path spec for the servlet
+   */
+  public void addJerseyResourcePackage(final String packageName,
+      final String pathSpec) {
+    LOG.info("addJerseyResourcePackage: packageName=" + packageName
+        + ", pathSpec=" + pathSpec);
+
+    ResourceConfig application = new ResourceConfig().packages(packageName);
+    final ServletHolder sh = new ServletHolder(new ServletContainer(application));
+    webAppContext.addServlet(sh, pathSpec);
+  }
+
+  /**
+   * Add a servlet in the server.
+   * @param name The name of the servlet (can be passed as null)
+   * @param pathSpec The path spec for the servlet
+   * @param clazz The servlet class
+   */
+  public void addServlet(String name, String pathSpec,
+      Class<? extends HttpServlet> clazz) {
+    addInternalServlet(name, pathSpec, clazz, false);
+    addFilterPathMapping(pathSpec, webAppContext);
+  }
+
+  /**
+   * Add an internal servlet in the server.
+   * Note: This method is to be used for adding servlets that facilitate
+   * internal communication and not for user facing functionality. For
+   * servlets added using this method, filters are not enabled.
+   *
+   * @param name The name of the servlet (can be passed as null)
+   * @param pathSpec The path spec for the servlet
+   * @param clazz The servlet class
+   */
+  public void addInternalServlet(String name, String pathSpec,
+      Class<? extends HttpServlet> clazz) {
+    addInternalServlet(name, pathSpec, clazz, false);
+  }
+
+  /**
+   * Add an internal servlet in the server, specifying whether or not to
+   * protect with Kerberos authentication.
+   * Note: This method is to be used for adding servlets that facilitate
+   * internal communication and not for user facing functionality. For
+   +   * servlets added using this method, filters (except internal Kerberos
+   * filters) are not enabled.
+   *
+   * @param name The name of the servlet (can be passed as null)
+   * @param pathSpec The path spec for the servlet
+   * @param clazz The servlet class
+   * @param requireAuth Require Kerberos authenticate to access servlet
+   */
+  public void addInternalServlet(String name, String pathSpec,
+      Class<? extends HttpServlet> clazz, boolean requireAuth) {
+    ServletHolder holder = new ServletHolder(clazz);
+    if (name != null) {
+      holder.setName(name);
+    }
+    webAppContext.addServlet(holder, pathSpec);
+
+    if(requireAuth && UserGroupInformation.isSecurityEnabled()) {
+       LOG.info("Adding Kerberos (SPNEGO) filter to " + name);
+       ServletHandler handler = webAppContext.getServletHandler();
+       FilterMapping fmap = new FilterMapping();
+       fmap.setPathSpec(pathSpec);
+       fmap.setFilterName(SPNEGO_FILTER);
+       fmap.setDispatches(FilterMapping.ALL);
+       handler.addFilterMapping(fmap);
+    }
+  }
+
+  @Override
+  public void addFilter(String name, String classname,
+      Map<String, String> parameters) {
+
+    final String[] USER_FACING_URLS = { "*.html", "*.jsp" };
+    defineFilter(webAppContext, name, classname, parameters, USER_FACING_URLS);
+    LOG.info("Added filter " + name + " (class=" + classname
+        + ") to context " + webAppContext.getDisplayName());
+    final String[] ALL_URLS = { "/*" };
+    for (Map.Entry<ServletContextHandler, Boolean> e : defaultContexts.entrySet()) {
+      if (e.getValue()) {
+        ServletContextHandler handler = e.getKey();
+        defineFilter(handler, name, classname, parameters, ALL_URLS);
+        LOG.info("Added filter " + name + " (class=" + classname
+            + ") to context " + handler.getDisplayName());
+      }
+    }
+    filterNames.add(name);
+  }
+
+  @Override
+  public void addGlobalFilter(String name, String classname,
+      Map<String, String> parameters) {
+    final String[] ALL_URLS = { "/*" };
+    defineFilter(webAppContext, name, classname, parameters, ALL_URLS);
+    for (ServletContextHandler ctx : defaultContexts.keySet()) {
+      defineFilter(ctx, name, classname, parameters, ALL_URLS);
+    }
+    LOG.info("Added global filter '" + name + "' (class=" + classname + ")");
+  }
+
+  /**
+   * Define a filter for a context and set up default url mappings.
+   */
+  public static void defineFilter(ServletContextHandler handler, String name,
+      String classname, Map<String,String> parameters, String[] urls) {
+
+    FilterHolder holder = new FilterHolder();
+    holder.setName(name);
+    holder.setClassName(classname);
+    if (parameters != null) {
+      holder.setInitParameters(parameters);
+    }
+    FilterMapping fmap = new FilterMapping();
+    fmap.setPathSpecs(urls);
+    fmap.setDispatches(FilterMapping.ALL);
+    fmap.setFilterName(name);
+    handler.getServletHandler().addFilter(holder, fmap);
+  }
+
+  /**
+   * Add the path spec to the filter path mapping.
+   * @param pathSpec The path spec
+   * @param webAppCtx The WebApplicationContext to add to
+   */
+  protected void addFilterPathMapping(String pathSpec,
+      WebAppContext webAppCtx) {
+    for(String name : filterNames) {
+      FilterMapping fmap = new FilterMapping();
+      fmap.setPathSpec(pathSpec);
+      fmap.setFilterName(name);
+      fmap.setDispatches(FilterMapping.ALL);
+      webAppCtx.getServletHandler().addFilterMapping(fmap);
+    }
+  }
+
+  /**
+   * Get the value in the webapp context.
+   * @param name The name of the attribute
+   * @return The value of the attribute
+   */
+  public Object getAttribute(String name) {
+    return webAppContext.getAttribute(name);
+  }
+
+  public WebAppContext getWebAppContext(){
+    return this.webAppContext;
+  }
+
+  public String getWebAppsPath(String appName) throws FileNotFoundException {
+      return getWebAppsPath(this.appDir, appName);
+  }
+
+  /**
+   * Get the pathname to the webapps files.
+   * @param appName eg "secondary" or "datanode"
+   * @return the pathname as a URL
+   * @throws FileNotFoundException if 'webapps' directory cannot be found on CLASSPATH.
+   */
+  protected String getWebAppsPath(String webapps, String appName) throws FileNotFoundException {
+    URL url = getClass().getClassLoader().getResource(webapps + "/" + appName);
+    if (url == null)
+      throw new FileNotFoundException(webapps + "/" + appName
+          + " not found in CLASSPATH");
+    String urlString = url.toString();
+    return urlString.substring(0, urlString.lastIndexOf('/'));
+  }
+
+  /**
+   * Get the port that the server is on
+   * @return the port
+   */
+  @Deprecated
+  public int getPort() {
+    return ((ServerConnector)webServer.getConnectors()[0]).getLocalPort();
+  }
+
+  /**
+   * Get the address that corresponds to a particular connector.
+   *
+   * @return the corresponding address for the connector, or null if there's no
+   *         such connector or the connector is not bounded.
+   */
+  public InetSocketAddress getConnectorAddress(int index) {
+    Preconditions.checkArgument(index >= 0);
+    if (index > webServer.getConnectors().length)
+      return null;
+
+    ServerConnector c = (ServerConnector)webServer.getConnectors()[index];
+    if (c.getLocalPort() == -1 || c.getLocalPort() == -2) {
+      // -1 if the connector has not been opened
+      // -2 if it has been closed
+      return null;
+    }
+
+    return new InetSocketAddress(c.getHost(), c.getLocalPort());
+  }
+
+  /**
+   * Set the min, max number of worker threads (simultaneous connections).
+   */
+  public void setThreads(int min, int max) {
+    QueuedThreadPool pool = (QueuedThreadPool) webServer.getThreadPool();
+    pool.setMinThreads(min);
+    pool.setMaxThreads(max);
+  }
+
+  private void initSpnego(Configuration conf, String hostName,
+      String usernameConfKey, String keytabConfKey, String kerberosNameRuleKey,
+      String signatureSecretKeyFileKey) throws IOException {
+    Map<String, String> params = new HashMap<>();
+    String principalInConf = getOrEmptyString(conf, usernameConfKey);
+    if (!principalInConf.isEmpty()) {
+      params.put(HTTP_SPNEGO_AUTHENTICATION_PRINCIPAL_SUFFIX, SecurityUtil.getServerPrincipal(
+          principalInConf, hostName));
+    }
+    String httpKeytab = getOrEmptyString(conf, keytabConfKey);
+    if (!httpKeytab.isEmpty()) {
+      params.put(HTTP_SPNEGO_AUTHENTICATION_KEYTAB_SUFFIX, httpKeytab);
+    }
+    String kerberosNameRule = getOrEmptyString(conf, kerberosNameRuleKey);
+    if (!kerberosNameRule.isEmpty()) {
+      params.put(HTTP_SPNEGO_AUTHENTICATION_KRB_NAME_SUFFIX, kerberosNameRule);
+    }
+    String signatureSecretKeyFile = getOrEmptyString(conf, signatureSecretKeyFileKey);
+    if (!signatureSecretKeyFile.isEmpty()) {
+      params.put(HTTP_AUTHENTICATION_SIGNATURE_SECRET_FILE_SUFFIX,
+          signatureSecretKeyFile);
+    }
+    params.put(AuthenticationFilter.AUTH_TYPE, "kerberos");
+
+    // Verify that the required options were provided
+    if (isMissing(params.get(HTTP_SPNEGO_AUTHENTICATION_PRINCIPAL_SUFFIX)) ||
+            isMissing(params.get(HTTP_SPNEGO_AUTHENTICATION_KEYTAB_SUFFIX))) {
+      throw new IllegalArgumentException(usernameConfKey + " and "
+          + keytabConfKey + " are both required in the configuration "
+          + "to enable SPNEGO/Kerberos authentication for the Web UI");
+    }
+
+    addGlobalFilter(SPNEGO_FILTER, AuthenticationFilter.class.getName(), params);
+  }
+
+  /**
+   * Returns true if the argument is non-null and not whitespace
+   */
+  private boolean isMissing(String value) {
+    if (null == value) {
+      return true;
+    }
+    return value.trim().isEmpty();
+  }
+
+  /**
+   * Extracts the value for the given key from the configuration of returns a string of
+   * zero length.
+   */
+  private String getOrEmptyString(Configuration conf, String key) {
+    if (null == key) {
+      return EMPTY_STRING;
+    }
+    final String value = conf.get(key.trim());
+    return null == value ? EMPTY_STRING : value;
+  }
+
+  /**
+   * Start the server. Does not wait for the server to start.
+   */
+  public void start() throws IOException {
+    try {
+      try {
+        openListeners();
+        webServer.start();
+      } catch (IOException ex) {
+        LOG.info("HttpServer.start() threw a non Bind IOException", ex);
+        throw ex;
+      } catch (MultiException ex) {
+        LOG.info("HttpServer.start() threw a MultiException", ex);
+        throw ex;
+      }
+      // Make sure there is no handler failures.
+      Handler[] handlers = webServer.getHandlers();
+      for (int i = 0; i < handlers.length; i++) {
+        if (handlers[i].isFailed()) {
+          throw new IOException(
+              "Problem in starting http server. Server handlers failed");
+        }
+      }
+      // Make sure there are no errors initializing the context.
+      Throwable unavailableException = webAppContext.getUnavailableException();
+      if (unavailableException != null) {
+        // Have to stop the webserver, or else its non-daemon threads
+        // will hang forever.
+        webServer.stop();
+        throw new IOException("Unable to initialize WebAppContext",
+            unavailableException);
+      }
+    } catch (IOException e) {
+      throw e;
+    } catch (InterruptedException e) {
+      throw (IOException) new InterruptedIOException(
+          "Interrupted while starting HTTP server").initCause(e);
+    } catch (Exception e) {
+      throw new IOException("Problem starting http server", e);
+    }
+  }
+
+  private void loadListeners() {
+    for (ListenerInfo li : listeners) {
+      webServer.addConnector(li.listener);
+    }
+  }
+
+  /**
+   * Open the main listener for the server
+   * @throws Exception
+   */
+  void openListeners() throws Exception {
+    for (ListenerInfo li : listeners) {
+      ServerConnector listener = li.listener;
+      if (!li.isManaged || (li.listener.getLocalPort() != -1 && li.listener.getLocalPort() != -2)) {
+        // This listener is either started externally, or has not been opened, or has been closed
+        continue;
+      }
+      int port = listener.getPort();
+      while (true) {
+        // jetty has a bug where you can't reopen a listener that previously
+        // failed to open w/o issuing a close first, even if the port is changed
+        try {
+          listener.close();
+          listener.open();
+          LOG.info("Jetty bound to port " + listener.getLocalPort());
+          break;
+        } catch (BindException ex) {
+          if (port == 0 || !findPort) {
+            BindException be = new BindException("Port in use: "
+                + listener.getHost() + ":" + listener.getPort());
+            be.initCause(ex);
+            throw be;
+          }
+        }
+        // try the next port number
+        listener.setPort(++port);
+        Thread.sleep(100);
+      }
+    }
+  }
+
+  /**
+   * stop the server
+   */
+  public void stop() throws Exception {
+    MultiException exception = null;
+    for (ListenerInfo li : listeners) {
+      if (!li.isManaged) {
+        continue;
+      }
+
+      try {
+        li.listener.close();
+      } catch (Exception e) {
+        LOG.error(
+            "Error while stopping listener for webapp"
+                + webAppContext.getDisplayName(), e);
+        exception = addMultiException(exception, e);
+      }
+    }
+
+    try {
+      // clear & stop webAppContext attributes to avoid memory leaks.
+      webAppContext.clearAttributes();
+      webAppContext.stop();
+    } catch (Exception e) {
+      LOG.error("Error while stopping web app context for webapp "
+          + webAppContext.getDisplayName(), e);
+      exception = addMultiException(exception, e);
+    }
+
+    try {
+      webServer.stop();
+    } catch (Exception e) {
+      LOG.error("Error while stopping web server for webapp "
+          + webAppContext.getDisplayName(), e);
+      exception = addMultiException(exception, e);
+    }
+
+    if (exception != null) {
+      exception.ifExceptionThrow();
+    }
+
+  }
+
+  private MultiException addMultiException(MultiException exception, Exception e) {
+    if(exception == null){
+      exception = new MultiException();
+    }
+    exception.add(e);
+    return exception;
+  }
+
+  public void join() throws InterruptedException {
+    webServer.join();
+  }
+
+  /**
+   * Test for the availability of the web server
+   * @return true if the web server is started, false otherwise
+   */
+  public boolean isAlive() {
+    return webServer != null && webServer.isStarted();
+  }
+
+  /**
+   * Return the host and port of the HttpServer, if live
+   * @return the classname and any HTTP URL
+   */
+  @Override
+  public String toString() {
+    if (listeners.isEmpty()) {
+      return "Inactive HttpServer";
+    } else {
+      StringBuilder sb = new StringBuilder("HttpServer (")
+        .append(isAlive() ? STATE_DESCRIPTION_ALIVE : STATE_DESCRIPTION_NOT_LIVE).append("), listening at:");
+      for (ListenerInfo li : listeners) {
+        ServerConnector l = li.listener;
+        sb.append(l.getHost()).append(":").append(l.getPort()).append("/,");
+      }
+      return sb.toString();
+    }
+  }
+
+  /**
+   * Checks the user has privileges to access to instrumentation servlets.
+   * <p>
+   * If <code>hadoop.security.instrumentation.requires.admin</code> is set to FALSE
+   * (default value) it always returns TRUE.
+   * </p><p>
+   * If <code>hadoop.security.instrumentation.requires.admin</code> is set to TRUE
+   * it will check that if the current user is in the admin ACLS. If the user is
+   * in the admin ACLs it returns TRUE, otherwise it returns FALSE.
+   * </p>
+   *
+   * @param servletContext the servlet context.
+   * @param request the servlet request.
+   * @param response the servlet response.
+   * @return TRUE/FALSE based on the logic decribed above.
+   */
+  public static boolean isInstrumentationAccessAllowed(
+    ServletContext servletContext, HttpServletRequest request,
+    HttpServletResponse response) throws IOException {
+    Configuration conf =
+      (Configuration) servletContext.getAttribute(CONF_CONTEXT_ATTRIBUTE);
+
+    boolean access = true;
+    boolean adminAccess = conf.getBoolean(
+      CommonConfigurationKeys.HADOOP_SECURITY_INSTRUMENTATION_REQUIRES_ADMIN,
+      false);
+    if (adminAccess) {
+      access = hasAdministratorAccess(servletContext, request, response);
+    }
+    return access;
+  }
+
+  /**
+   * Does the user sending the HttpServletRequest has the administrator ACLs? If
+   * it isn't the case, response will be modified to send an error to the user.
+   *
+   * @param servletContext
+   * @param request
+   * @param response used to send the error response if user does not have admin access.
+   * @return true if admin-authorized, false otherwise
+   * @throws IOException
+   */
+  public static boolean hasAdministratorAccess(
+      ServletContext servletContext, HttpServletRequest request,
+      HttpServletResponse response) throws IOException {
+    Configuration conf =
+        (Configuration) servletContext.getAttribute(CONF_CONTEXT_ATTRIBUTE);
+    // If there is no authorization, anybody has administrator access.
+    if (!conf.getBoolean(
+        CommonConfigurationKeys.HADOOP_SECURITY_AUTHORIZATION, false)) {
+      return true;
+    }
+
+    String remoteUser = request.getRemoteUser();
+    if (remoteUser == null) {
+      response.sendError(HttpServletResponse.SC_UNAUTHORIZED,
+                         "Unauthenticated users are not " +
+                         "authorized to access this page.");
+      return false;
+    }
+
+    if (servletContext.getAttribute(ADMINS_ACL) != null &&
+        !userHasAdministratorAccess(servletContext, remoteUser)) {
+      response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "User "
+          + remoteUser + " is unauthorized to access this page.");
+      return false;
+    }
+
+    return true;
+  }
+
+  /**
+   * Get the admin ACLs from the given ServletContext and check if the given
+   * user is in the ACL.
+   *
+   * @param servletContext the context containing the admin ACL.
+   * @param remoteUser the remote user to check for.
+   * @return true if the user is present in the ACL, false if no ACL is set or
+   *         the user is not present
+   */
+  public static boolean userHasAdministratorAccess(ServletContext servletContext,
+      String remoteUser) {
+    AccessControlList adminsAcl = (AccessControlList) servletContext
+        .getAttribute(ADMINS_ACL);
+    UserGroupInformation remoteUserUGI =
+        UserGroupInformation.createRemoteUser(remoteUser);
+    return adminsAcl != null && adminsAcl.isUserAllowed(remoteUserUGI);
+  }
+
+  /**
+   * A very simple servlet to serve up a text representation of the current
+   * stack traces. It both returns the stacks to the caller and logs them.
+   * Currently the stack traces are done sequentially rather than exactly the
+   * same data.
+   */
+  public static class StackServlet extends HttpServlet {
+    private static final long serialVersionUID = -6284183679759467039L;
+
+    @Override
+    public void doGet(HttpServletRequest request, HttpServletResponse response)
+      throws ServletException, IOException {
+      if (!HttpServer.isInstrumentationAccessAllowed(getServletContext(),
+                                                     request, response)) {
+        return;
+      }
+      response.setContentType("text/plain; charset=UTF-8");
+      try (PrintStream out = new PrintStream(
+        response.getOutputStream(), false, "UTF-8")) {
+        Threads.printThreadInfo(out, "");
+        out.flush();
+      }
+      ReflectionUtils.logThreadInfo(LOG, "jsp requested", 1);
+    }
+  }
+
+  /**
+   * A Servlet input filter that quotes all HTML active characters in the
+   * parameter names and values. The goal is to quote the characters to make
+   * all of the servlets resistant to cross-site scripting attacks.
+   */
+  @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
+  public static class QuotingInputFilter implements Filter {
+    private FilterConfig config;
+
+    public static class RequestQuoter extends HttpServletRequestWrapper {
+      private final HttpServletRequest rawRequest;
+      public RequestQuoter(HttpServletRequest rawRequest) {
+        super(rawRequest);
+        this.rawRequest = rawRequest;
+      }
+
+      /**
+       * Return the set of parameter names, quoting each name.
+       */
+      @Override
+      public Enumeration<String> getParameterNames() {
+        return new Enumeration<String>() {
+          private Enumeration<String> rawIterator =
+            rawRequest.getParameterNames();
+          @Override
+          public boolean hasMoreElements() {
+            return rawIterator.hasMoreElements();
+          }
+
+          @Override
+          public String nextElement() {
+            return HtmlQuoting.quoteHtmlChars(rawIterator.nextElement());
+          }
+        };
+      }
+
+      /**
+       * Unquote the name and quote the value.
+       */
+      @Override
+      public String getParameter(String name) {
+        return HtmlQuoting.quoteHtmlChars(rawRequest.getParameter
+                                     (HtmlQuoting.unquoteHtmlChars(name)));
+      }
+
+      @Override
+      public String[] getParameterValues(String name) {
+        String unquoteName = HtmlQuoting.unquoteHtmlChars(name);
+        String[] unquoteValue = rawRequest.getParameterValues(unquoteName);
+        if (unquoteValue == null) {
+          return null;
+        }
+        String[] result = new String[unquoteValue.length];
+        for(int i=0; i < result.length; ++i) {
+          result[i] = HtmlQuoting.quoteHtmlChars(unquoteValue[i]);
+        }
+        return result;
+      }
+
+      @Override
+      public Map<String, String[]> getParameterMap() {
+        Map<String, String[]> result = new HashMap<>();
+        Map<String, String[]> raw = rawRequest.getParameterMap();
+        for (Map.Entry<String,String[]> item: raw.entrySet()) {
+          String[] rawValue = item.getValue();
+          String[] cookedValue = new String[rawValue.length];
+          for(int i=0; i< rawValue.length; ++i) {
+            cookedValue[i] = HtmlQuoting.quoteHtmlChars(rawValue[i]);
+          }
+          result.put(HtmlQuoting.quoteHtmlChars(item.getKey()), cookedValue);
+        }
+        return result;
+      }
+
+      /**
+       * Quote the url so that users specifying the HOST HTTP header
+       * can't inject attacks.
+       */
+      @Override
+      public StringBuffer getRequestURL(){
+        String url = rawRequest.getRequestURL().toString();
+        return new StringBuffer(HtmlQuoting.quoteHtmlChars(url));
+      }
+
+      /**
+       * Quote the server name so that users specifying the HOST HTTP header
+       * can't inject attacks.
+       */
+      @Override
+      public String getServerName() {
+        return HtmlQuoting.quoteHtmlChars(rawRequest.getServerName());
+      }
+    }
+
+    @Override
+    public void init(FilterConfig config) throws ServletException {
+      this.config = config;
+    }
+
+    @Override
+    public void destroy() {
+    }
+
+    @Override
+    public void doFilter(ServletRequest request,
+                         ServletResponse response,
+                         FilterChain chain
+                         ) throws IOException, ServletException {
+      HttpServletRequestWrapper quoted =
+        new RequestQuoter((HttpServletRequest) request);
+      HttpServletResponse httpResponse = (HttpServletResponse) response;
+
+      String mime = inferMimeType(request);
+      if (mime == null) {
+        httpResponse.setContentType("text/plain; charset=utf-8");
+      } else if (mime.startsWith("text/html")) {
+        // HTML with unspecified encoding, we want to
+        // force HTML with utf-8 encoding
+        // This is to avoid the following security issue:
+        // http://openmya.hacker.jp/hasegawa/security/utf7cs.html
+        httpResponse.setContentType("text/html; charset=utf-8");
+      } else if (mime.startsWith("application/xml")) {
+        httpResponse.setContentType("text/xml; charset=utf-8");
+      }
+      chain.doFilter(quoted, httpResponse);
+    }
+
+    /**
+     * Infer the mime type for the response based on the extension of the request
+     * URI. Returns null if unknown.
+     */
+    private String inferMimeType(ServletRequest request) {
+      String path = ((HttpServletRequest)request).getRequestURI();
+      ServletContext context = config.getServletContext();
+      return context.getMimeType(path);
+    }
+  }
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/3969b853/hbase-http/src/main/java/org/apache/hadoop/hbase/http/HttpServerUtil.java
----------------------------------------------------------------------
diff --git a/hbase-http/src/main/java/org/apache/hadoop/hbase/http/HttpServerUtil.java b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/HttpServerUtil.java
new file mode 100644
index 0000000..0b33fd1
--- /dev/null
+++ b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/HttpServerUtil.java
@@ -0,0 +1,52 @@
+/**
+ * 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.hbase.http;
+
+import org.eclipse.jetty.security.ConstraintSecurityHandler;
+import org.eclipse.jetty.util.security.Constraint;
+import org.eclipse.jetty.security.ConstraintMapping;
+import org.eclipse.jetty.servlet.ServletContextHandler;
+
+/**
+ * HttpServer utility.
+ */
+public class HttpServerUtil {
+  /**
+   * Add constraints to a Jetty Context to disallow undesirable Http methods.
+   * @param ctxHandler The context to modify
+   */
+  public static void constrainHttpMethods(ServletContextHandler ctxHandler) {
+    Constraint c = new Constraint();
+    c.setAuthenticate(true);
+
+    ConstraintMapping cmt = new ConstraintMapping();
+    cmt.setConstraint(c);
+    cmt.setMethod("TRACE");
+    cmt.setPathSpec("/*");
+
+    ConstraintMapping cmo = new ConstraintMapping();
+    cmo.setConstraint(c);
+    cmo.setMethod("OPTIONS");
+    cmo.setPathSpec("/*");
+
+    ConstraintSecurityHandler securityHandler = new ConstraintSecurityHandler();
+    securityHandler.setConstraintMappings(new ConstraintMapping[]{ cmt, cmo });
+
+    ctxHandler.setSecurityHandler(securityHandler);
+  }
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/3969b853/hbase-http/src/main/java/org/apache/hadoop/hbase/http/InfoServer.java
----------------------------------------------------------------------
diff --git a/hbase-http/src/main/java/org/apache/hadoop/hbase/http/InfoServer.java b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/InfoServer.java
new file mode 100644
index 0000000..5fd6514
--- /dev/null
+++ b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/InfoServer.java
@@ -0,0 +1,112 @@
+/**
+ *
+ * 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.hbase.http;
+
+import java.io.IOException;
+import java.net.URI;
+
+import javax.servlet.http.HttpServlet;
+
+import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.apache.hadoop.conf.Configuration;
+
+/**
+ * Create a Jetty embedded server to answer http requests. The primary goal
+ * is to serve up status information for the server.
+ * There are three contexts:
+ *   "/stacks/" -&gt; points to stack trace
+ *   "/static/" -&gt; points to common static files (src/hbase-webapps/static)
+ *   "/" -&gt; the jsp server code from (src/hbase-webapps/&lt;name&gt;)
+ */
+@InterfaceAudience.Private
+public class InfoServer {
+
+  private static final String HBASE_APP_DIR = "hbase-webapps";
+  private final org.apache.hadoop.hbase.http.HttpServer httpServer;
+
+  /**
+   * Create a status server on the given port.
+   * The jsp scripts are taken from src/hbase-webapps/<code>name</code>.
+   * @param name The name of the server
+   * @param bindAddress address to bind to
+   * @param port The port to use on the server
+   * @param findPort whether the server should start at the given port and
+   * increment by 1 until it finds a free port.
+   * @throws IOException e
+   */
+  public InfoServer(String name, String bindAddress, int port, boolean findPort,
+      final Configuration c)
+  throws IOException {
+    HttpConfig httpConfig = new HttpConfig(c);
+    HttpServer.Builder builder =
+      new org.apache.hadoop.hbase.http.HttpServer.Builder();
+
+      builder.setName(name).addEndpoint(URI.create(httpConfig.getSchemePrefix() +
+        bindAddress + ":" +
+        port)).setAppDir(HBASE_APP_DIR).setFindPort(findPort).setConf(c);
+      String logDir = System.getProperty("hbase.log.dir");
+      if (logDir != null) {
+        builder.setLogDir(logDir);
+      }
+    if (httpConfig.isSecure()) {
+    builder.keyPassword(HBaseConfiguration.getPassword(c, "ssl.server.keystore.keypassword", null))
+      .keyStore(c.get("ssl.server.keystore.location"),
+        HBaseConfiguration.getPassword(c,"ssl.server.keystore.password", null),
+        c.get("ssl.server.keystore.type", "jks"))
+      .trustStore(c.get("ssl.server.truststore.location"),
+        HBaseConfiguration.getPassword(c, "ssl.server.truststore.password", null),
+        c.get("ssl.server.truststore.type", "jks"));
+    }
+    // Enable SPNEGO authentication
+    if ("kerberos".equalsIgnoreCase(c.get(HttpServer.HTTP_UI_AUTHENTICATION, null))) {
+      builder.setUsernameConfKey(HttpServer.HTTP_SPNEGO_AUTHENTICATION_PRINCIPAL_KEY)
+        .setKeytabConfKey(HttpServer.HTTP_SPNEGO_AUTHENTICATION_KEYTAB_KEY)
+        .setKerberosNameRulesKey(HttpServer.HTTP_SPNEGO_AUTHENTICATION_KRB_NAME_KEY)
+        .setSignatureSecretFileKey(
+            HttpServer.HTTP_AUTHENTICATION_SIGNATURE_SECRET_FILE_KEY)
+        .setSecurityEnabled(true);
+    }
+    this.httpServer = builder.build();
+  }
+
+  public void addServlet(String name, String pathSpec,
+          Class<? extends HttpServlet> clazz) {
+      this.httpServer.addServlet(name, pathSpec, clazz);
+  }
+
+  public void setAttribute(String name, Object value) {
+    this.httpServer.setAttribute(name, value);
+  }
+
+  public void start() throws IOException {
+    this.httpServer.start();
+  }
+
+  @Deprecated
+  public int getPort() {
+    return this.httpServer.getPort();
+  }
+
+  public void stop() throws Exception {
+    this.httpServer.stop();
+  }
+
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/3969b853/hbase-http/src/main/java/org/apache/hadoop/hbase/http/NoCacheFilter.java
----------------------------------------------------------------------
diff --git a/hbase-http/src/main/java/org/apache/hadoop/hbase/http/NoCacheFilter.java b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/NoCacheFilter.java
new file mode 100644
index 0000000..a1daf15
--- /dev/null
+++ b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/NoCacheFilter.java
@@ -0,0 +1,56 @@
+/**
+ * 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.hbase.http;
+
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+import org.apache.yetus.audience.InterfaceAudience;
+import org.apache.hadoop.hbase.HBaseInterfaceAudience;
+
+@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
+public class NoCacheFilter implements Filter {
+
+  @Override
+  public void init(FilterConfig filterConfig) throws ServletException {
+  }
+
+  @Override
+  public void doFilter(ServletRequest req, ServletResponse res,
+                       FilterChain chain)
+    throws IOException, ServletException {
+    HttpServletResponse httpRes = (HttpServletResponse) res;
+    httpRes.setHeader("Cache-Control", "no-cache");
+    long now = System.currentTimeMillis();
+    httpRes.addDateHeader("Expires", now);
+    httpRes.addDateHeader("Date", now);
+    httpRes.addHeader("Pragma", "no-cache");
+    chain.doFilter(req, res);
+  }
+
+  @Override
+  public void destroy() {
+  }
+
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/3969b853/hbase-http/src/main/java/org/apache/hadoop/hbase/http/ServerConfigurationKeys.java
----------------------------------------------------------------------
diff --git a/hbase-http/src/main/java/org/apache/hadoop/hbase/http/ServerConfigurationKeys.java b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/ServerConfigurationKeys.java
new file mode 100644
index 0000000..8f338a7
--- /dev/null
+++ b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/ServerConfigurationKeys.java
@@ -0,0 +1,47 @@
+/**
+ * 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.hbase.http;
+
+import org.apache.yetus.audience.InterfaceAudience;
+import org.apache.yetus.audience.InterfaceStability;
+
+/**
+ * This interface contains constants for configuration keys used
+ * in the hbase http server code.
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Evolving
+public interface ServerConfigurationKeys {
+
+  /** Enable/Disable ssl for http server */
+  public static final String HBASE_SSL_ENABLED_KEY = "hbase.ssl.enabled";
+
+  public static final boolean HBASE_SSL_ENABLED_DEFAULT = false;
+
+  /** Enable/Disable aliases serving from jetty */
+  public static final String HBASE_JETTY_LOGS_SERVE_ALIASES =
+      "hbase.jetty.logs.serve.aliases";
+
+  public static final boolean DEFAULT_HBASE_JETTY_LOGS_SERVE_ALIASES =
+      true;
+
+  public static final String HBASE_HTTP_STATIC_USER = "hbase.http.staticuser.user";
+
+  public static final String DEFAULT_HBASE_HTTP_STATIC_USER = "dr.stack";
+
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/3969b853/hbase-http/src/main/java/org/apache/hadoop/hbase/http/conf/ConfServlet.java
----------------------------------------------------------------------
diff --git a/hbase-http/src/main/java/org/apache/hadoop/hbase/http/conf/ConfServlet.java b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/conf/ConfServlet.java
new file mode 100644
index 0000000..d9aa7b6
--- /dev/null
+++ b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/conf/ConfServlet.java
@@ -0,0 +1,107 @@
+/**
+ * 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.hbase.http.conf;
+
+import java.io.IOException;
+import java.io.Writer;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.yetus.audience.InterfaceAudience;
+import org.apache.yetus.audience.InterfaceStability;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.http.HttpServer;
+
+/**
+ * A servlet to print out the running configuration data.
+ */
+@InterfaceAudience.LimitedPrivate({"HBase"})
+@InterfaceStability.Unstable
+public class ConfServlet extends HttpServlet {
+  private static final long serialVersionUID = 1L;
+
+  private static final String FORMAT_JSON = "json";
+  private static final String FORMAT_XML = "xml";
+  private static final String FORMAT_PARAM = "format";
+
+  /**
+   * Return the Configuration of the daemon hosting this servlet.
+   * This is populated when the HttpServer starts.
+   */
+  private Configuration getConfFromContext() {
+    Configuration conf = (Configuration)getServletContext().getAttribute(
+        HttpServer.CONF_CONTEXT_ATTRIBUTE);
+    assert conf != null;
+    return conf;
+  }
+
+  @Override
+  public void doGet(HttpServletRequest request, HttpServletResponse response)
+      throws ServletException, IOException {
+
+    if (!HttpServer.isInstrumentationAccessAllowed(getServletContext(),
+                                                   request, response)) {
+      return;
+    }
+
+    String format = request.getParameter(FORMAT_PARAM);
+    if (null == format) {
+      format = FORMAT_XML;
+    }
+
+    if (FORMAT_XML.equals(format)) {
+      response.setContentType("text/xml; charset=utf-8");
+    } else if (FORMAT_JSON.equals(format)) {
+      response.setContentType("application/json; charset=utf-8");
+    }
+
+    Writer out = response.getWriter();
+    try {
+      writeResponse(getConfFromContext(), out, format);
+    } catch (BadFormatException bfe) {
+      response.sendError(HttpServletResponse.SC_BAD_REQUEST, bfe.getMessage());
+    }
+    out.close();
+  }
+
+  /**
+   * Guts of the servlet - extracted for easy testing.
+   */
+  static void writeResponse(Configuration conf, Writer out, String format)
+    throws IOException, BadFormatException {
+    if (FORMAT_JSON.equals(format)) {
+      Configuration.dumpConfiguration(conf, out);
+    } else if (FORMAT_XML.equals(format)) {
+      conf.writeXml(out);
+    } else {
+      throw new BadFormatException("Bad format: " + format);
+    }
+  }
+
+  public static class BadFormatException extends Exception {
+    private static final long serialVersionUID = 1L;
+
+    public BadFormatException(String msg) {
+      super(msg);
+    }
+  }
+
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/3969b853/hbase-http/src/main/java/org/apache/hadoop/hbase/http/jmx/JMXJsonServlet.java
----------------------------------------------------------------------
diff --git a/hbase-http/src/main/java/org/apache/hadoop/hbase/http/jmx/JMXJsonServlet.java b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/jmx/JMXJsonServlet.java
new file mode 100644
index 0000000..2e43be2
--- /dev/null
+++ b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/jmx/JMXJsonServlet.java
@@ -0,0 +1,240 @@
+/*
+ * 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.hbase.http.jmx;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.lang.management.ManagementFactory;
+
+import javax.management.MBeanServer;
+import javax.management.MalformedObjectNameException;
+import javax.management.ObjectName;
+import javax.management.openmbean.CompositeData;
+import javax.management.openmbean.TabularData;
+import javax.servlet.ServletException;
+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.hbase.http.HttpServer;
+import org.apache.hadoop.hbase.util.JSONBean;
+
+/*
+ * This servlet is based off of the JMXProxyServlet from Tomcat 7.0.14. It has
+ * been rewritten to be read only and to output in a JSON format so it is not
+ * really that close to the original.
+ */
+/**
+ * Provides Read only web access to JMX.
+ * <p>
+ * This servlet generally will be placed under the /jmx URL for each
+ * HttpServer.  It provides read only
+ * access to JMX metrics.  The optional <code>qry</code> parameter
+ * may be used to query only a subset of the JMX Beans.  This query
+ * functionality is provided through the
+ * {@link MBeanServer#queryNames(ObjectName, javax.management.QueryExp)}
+ * method.
+ * </p>
+ * <p>
+ * For example <code>http://.../jmx?qry=Hadoop:*</code> will return
+ * all hadoop metrics exposed through JMX.
+ * </p>
+ * <p>
+ * The optional <code>get</code> parameter is used to query an specific
+ * attribute of a JMX bean.  The format of the URL is
+ * <code>http://.../jmx?get=MXBeanName::AttributeName</code>
+ * </p>
+ * <p>
+ * For example
+ * <code>
+ * http://../jmx?get=Hadoop:service=NameNode,name=NameNodeInfo::ClusterId
+ * </code> will return the cluster id of the namenode mxbean.
+ * </p>
+ * <p>
+ * If the <code>qry</code> or the <code>get</code> parameter is not formatted
+ * correctly then a 400 BAD REQUEST http response code will be returned.
+ * </p>
+ * <p>
+ * If a resouce such as a mbean or attribute can not be found,
+ * a 404 SC_NOT_FOUND http response code will be returned.
+ * </p>
+ * <p>
+ * The return format is JSON and in the form
+ * </p>
+ *  <pre><code>
+ *  {
+ *    "beans" : [
+ *      {
+ *        "name":"bean-name"
+ *        ...
+ *      }
+ *    ]
+ *  }
+ *  </code></pre>
+ *  <p>
+ *  The servlet attempts to convert the the JMXBeans into JSON. Each
+ *  bean's attributes will be converted to a JSON object member.
+ *
+ *  If the attribute is a boolean, a number, a string, or an array
+ *  it will be converted to the JSON equivalent.
+ *
+ *  If the value is a {@link CompositeData} then it will be converted
+ *  to a JSON object with the keys as the name of the JSON member and
+ *  the value is converted following these same rules.
+ *
+ *  If the value is a {@link TabularData} then it will be converted
+ *  to an array of the {@link CompositeData} elements that it contains.
+ *
+ *  All other objects will be converted to a string and output as such.
+ *
+ *  The bean's name and modelerType will be returned for all beans.
+ *
+ *  Optional paramater "callback" should be used to deliver JSONP response.
+ * </p>
+ *
+ */
+public class JMXJsonServlet extends HttpServlet {
+  private static final Log LOG = LogFactory.getLog(JMXJsonServlet.class);
+
+  private static final long serialVersionUID = 1L;
+
+  private static final String CALLBACK_PARAM = "callback";
+  /**
+   * If query string includes 'description', then we will emit bean and attribute descriptions to
+   * output IFF they are not null and IFF the description is not the same as the attribute name:
+   * i.e. specify an URL like so: /jmx?description=true
+   */
+  private static final String INCLUDE_DESCRIPTION = "description";
+
+  /**
+   * MBean server.
+   */
+  protected transient MBeanServer mBeanServer;
+
+  protected transient JSONBean jsonBeanWriter;
+
+  /**
+   * Initialize this servlet.
+   */
+  @Override
+  public void init() throws ServletException {
+    // Retrieve the MBean server
+    mBeanServer = ManagementFactory.getPlatformMBeanServer();
+    this.jsonBeanWriter = new JSONBean();
+  }
+
+  /**
+   * Process a GET request for the specified resource.
+   *
+   * @param request
+   *          The servlet request we are processing
+   * @param response
+   *          The servlet response we are creating
+   */
+  @Override
+  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
+    try {
+      if (!HttpServer.isInstrumentationAccessAllowed(getServletContext(), request, response)) {
+        return;
+      }
+      String jsonpcb = null;
+      PrintWriter writer = null;
+      JSONBean.Writer beanWriter = null;
+      try {
+        jsonpcb = checkCallbackName(request.getParameter(CALLBACK_PARAM));
+        writer = response.getWriter();
+        beanWriter = this.jsonBeanWriter.open(writer);
+
+        // "callback" parameter implies JSONP outpout
+        if (jsonpcb != null) {
+          response.setContentType("application/javascript; charset=utf8");
+          writer.write(jsonpcb + "(");
+        } else {
+          response.setContentType("application/json; charset=utf8");
+        }
+        // Should we output description on each attribute and bean?
+        String tmpStr = request.getParameter(INCLUDE_DESCRIPTION);
+        boolean description = tmpStr != null && tmpStr.length() > 0;
+
+        // query per mbean attribute
+        String getmethod = request.getParameter("get");
+        if (getmethod != null) {
+          String[] splitStrings = getmethod.split("\\:\\:");
+          if (splitStrings.length != 2) {
+            beanWriter.write("result", "ERROR");
+            beanWriter.write("message", "query format is not as expected.");
+            beanWriter.flush();
+            response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
+            return;
+          }
+          if (beanWriter.write(this.mBeanServer, new ObjectName(splitStrings[0]),
+              splitStrings[1], description) != 0) {
+            beanWriter.flush();
+            response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
+          }
+          return;
+        }
+
+        // query per mbean
+        String qry = request.getParameter("qry");
+        if (qry == null) {
+          qry = "*:*";
+        }
+        if (beanWriter.write(this.mBeanServer, new ObjectName(qry), null, description) != 0) {
+          beanWriter.flush();
+          response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
+        }
+      } finally {
+        if (beanWriter != null) beanWriter.close();
+        if (jsonpcb != null) {
+           writer.write(");");
+        }
+        if (writer != null) {
+          writer.close();
+        }
+      }
+    } catch (IOException e) {
+      LOG.error("Caught an exception while processing JMX request", e);
+      response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
+    } catch (MalformedObjectNameException e) {
+      LOG.error("Caught an exception while processing JMX request", e);
+      response.sendError(HttpServletResponse.SC_BAD_REQUEST);
+    }
+  }
+
+  /**
+   * Verifies that the callback property, if provided, is purely alphanumeric.
+   * This prevents a malicious callback name (that is javascript code) from being
+   * returned by the UI to an unsuspecting user.
+   *
+   * @param callbackName The callback name, can be null.
+   * @return The callback name
+   * @throws IOException If the name is disallowed.
+   */
+  private String checkCallbackName(String callbackName) throws IOException {
+    if (null == callbackName) {
+      return null;
+    }
+    if (callbackName.matches("[A-Za-z0-9_]+")) {
+      return callbackName;
+    }
+    throw new IOException("'callback' must be alphanumeric");
+  }
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/3969b853/hbase-http/src/main/java/org/apache/hadoop/hbase/http/jmx/package-info.java
----------------------------------------------------------------------
diff --git a/hbase-http/src/main/java/org/apache/hadoop/hbase/http/jmx/package-info.java b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/jmx/package-info.java
new file mode 100644
index 0000000..21667d7
--- /dev/null
+++ b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/jmx/package-info.java
@@ -0,0 +1,26 @@
+/*
+ * 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.
+ */
+
+/**
+ * This package provides access to JMX primarily through the
+ * {@link org.apache.hadoop.hbase.http.jmx.JMXJsonServlet} class.
+ * <p>
+ * Copied from hadoop source code.<br>
+ * See https://issues.apache.org/jira/browse/HADOOP-10232 to know why.
+ * </p>
+ */
+package org.apache.hadoop.hbase.http.jmx;

http://git-wip-us.apache.org/repos/asf/hbase/blob/3969b853/hbase-http/src/main/java/org/apache/hadoop/hbase/http/lib/StaticUserWebFilter.java
----------------------------------------------------------------------
diff --git a/hbase-http/src/main/java/org/apache/hadoop/hbase/http/lib/StaticUserWebFilter.java b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/lib/StaticUserWebFilter.java
new file mode 100644
index 0000000..a1fa9f0
--- /dev/null
+++ b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/lib/StaticUserWebFilter.java
@@ -0,0 +1,155 @@
+/**
+ * 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.hbase.http.lib;
+
+import java.io.IOException;
+import java.security.Principal;
+import java.util.HashMap;
+
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletRequestWrapper;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.HBaseInterfaceAudience;
+import org.apache.hadoop.hbase.http.FilterContainer;
+import org.apache.hadoop.hbase.http.FilterInitializer;
+
+import javax.servlet.Filter;
+
+import static org.apache.hadoop.hbase.http.ServerConfigurationKeys.HBASE_HTTP_STATIC_USER;
+import static org.apache.hadoop.hbase.http.ServerConfigurationKeys.DEFAULT_HBASE_HTTP_STATIC_USER;
+
+/**
+ * Provides a servlet filter that pretends to authenticate a fake user (Dr.Who)
+ * so that the web UI is usable for a secure cluster without authentication.
+ */
+@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
+public class StaticUserWebFilter extends FilterInitializer {
+  static final String DEPRECATED_UGI_KEY = "dfs.web.ugi";
+
+  private static final Log LOG = LogFactory.getLog(StaticUserWebFilter.class);
+
+  static class User implements Principal {
+    private final String name;
+    public User(String name) {
+      this.name = name;
+    }
+    @Override
+    public String getName() {
+      return name;
+    }
+    @Override
+    public int hashCode() {
+      return name.hashCode();
+    }
+    @Override
+    public boolean equals(Object other) {
+      if (other == this) {
+        return true;
+      } else if (other == null || other.getClass() != getClass()) {
+        return false;
+      }
+      return ((User) other).name.equals(name);
+    }
+    @Override
+    public String toString() {
+      return name;
+    }
+  }
+
+  @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
+  public static class StaticUserFilter implements Filter {
+    private User user;
+    private String username;
+
+    @Override
+    public void destroy() {
+      // NOTHING
+    }
+
+    @Override
+    public void doFilter(ServletRequest request, ServletResponse response,
+                         FilterChain chain
+                         ) throws IOException, ServletException {
+      HttpServletRequest httpRequest = (HttpServletRequest) request;
+      // if the user is already authenticated, don't override it
+      if (httpRequest.getRemoteUser() != null) {
+        chain.doFilter(request, response);
+      } else {
+        HttpServletRequestWrapper wrapper =
+            new HttpServletRequestWrapper(httpRequest) {
+          @Override
+          public Principal getUserPrincipal() {
+            return user;
+          }
+          @Override
+          public String getRemoteUser() {
+            return username;
+          }
+        };
+        chain.doFilter(wrapper, response);
+      }
+    }
+
+    @Override
+    public void init(FilterConfig conf) throws ServletException {
+      this.username = conf.getInitParameter(HBASE_HTTP_STATIC_USER);
+      this.user = new User(username);
+    }
+
+  }
+
+  @Override
+  public void initFilter(FilterContainer container, Configuration conf) {
+    HashMap<String, String> options = new HashMap<>();
+
+    String username = getUsernameFromConf(conf);
+    options.put(HBASE_HTTP_STATIC_USER, username);
+
+    container.addFilter("static_user_filter",
+                        StaticUserFilter.class.getName(),
+                        options);
+  }
+
+  /**
+   * Retrieve the static username from the configuration.
+   */
+  static String getUsernameFromConf(Configuration conf) {
+    String oldStyleUgi = conf.get(DEPRECATED_UGI_KEY);
+    if (oldStyleUgi != null) {
+      // We can't use the normal configuration deprecation mechanism here
+      // since we need to split out the username from the configured UGI.
+      LOG.warn(DEPRECATED_UGI_KEY + " should not be used. Instead, use " +
+          HBASE_HTTP_STATIC_USER + ".");
+      String[] parts = oldStyleUgi.split(",");
+      return parts[0];
+    } else {
+      return conf.get(HBASE_HTTP_STATIC_USER,
+        DEFAULT_HBASE_HTTP_STATIC_USER);
+    }
+  }
+
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/3969b853/hbase-http/src/main/java/org/apache/hadoop/hbase/http/lib/package-info.java
----------------------------------------------------------------------
diff --git a/hbase-http/src/main/java/org/apache/hadoop/hbase/http/lib/package-info.java b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/lib/package-info.java
new file mode 100644
index 0000000..7bb9a0f
--- /dev/null
+++ b/hbase-http/src/main/java/org/apache/hadoop/hbase/http/lib/package-info.java
@@ -0,0 +1,38 @@
+/*
+ * 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.
+ */
+/**
+ * <p>
+ * This package provides user-selectable (via configuration) classes that add
+ * functionality to the web UI. They are configured as a list of classes in the
+ * configuration parameter <b>hadoop.http.filter.initializers</b>.
+ * </p>
+ * <ul>
+ * <li> <b>StaticUserWebFilter</b> - An authorization plugin that makes all
+ * users a static configured user.
+ * </ul>
+ * <p>
+ * Copied from hadoop source code.<br>
+ * See https://issues.apache.org/jira/browse/HADOOP-10232 to know why
+ * </p>
+ */
+@InterfaceAudience.LimitedPrivate({"HBase"})
+@InterfaceStability.Unstable
+package org.apache.hadoop.hbase.http.lib;
+
+import org.apache.yetus.audience.InterfaceAudience;
+import org.apache.yetus.audience.InterfaceStability;


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