Package org.apache.hadoop.hbase.stargate.auth

Source Code of org.apache.hadoop.hbase.stargate.auth.ZooKeeperAuthenticator$UserModel

/*
* Copyright 2010 The Apache Software Foundation
*
* 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.stargate.auth;

import java.io.ByteArrayInputStream;
import java.io.IOException;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;

import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.stargate.Constants;
import org.apache.hadoop.hbase.stargate.User;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper;

import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.data.Stat;

import com.sun.jersey.api.json.JSONConfiguration;
import com.sun.jersey.api.json.JSONJAXBContext;
import com.sun.jersey.api.json.JSONUnmarshaller;

/**
* A simple authenticator module for ZooKeeper.
* <pre>
*   /stargate/
*     users/
*       &lt;token&gt;</pre>
* Where <tt>&lt;token&gt;</tt> is a JSON formatted user record with the keys
* 'name' (String, required), 'token' (String, optional), 'admin' (boolean,
* optional), and 'disabled' (boolean, optional).
*/
public class ZooKeeperAuthenticator extends Authenticator
    implements Constants {

  @XmlRootElement(name="user")
  static class UserModel {
    @XmlAttribute public String name;
    @XmlAttribute public boolean admin = false;
    @XmlAttribute public boolean disabled = false;
  }

  final String usersZNode;
  ZooKeeperWrapper wrapper;
  final JSONJAXBContext context;
  final JSONUnmarshaller unmarshaller;

  private boolean ensureParentExists(final String znode) {
    int index = znode.lastIndexOf("/");
    if (index <= 0) {   // Parent is root, which always exists.
      return true;
    }
    return ensureExists(znode.substring(0, index));
  }

  private boolean ensureExists(final String znode) {
    ZooKeeper zk = wrapper.getZooKeeper();
    try {
      Stat stat = zk.exists(znode, false);
      if (stat != null) {
        return true;
      }
      zk.create(znode, new byte[0], Ids.OPEN_ACL_UNSAFE,
        CreateMode.PERSISTENT);
      return true;
    } catch (KeeperException.NodeExistsException e) {
      return true;      // ok, move on.
    } catch (KeeperException.NoNodeException e) {
      return ensureParentExists(znode) && ensureExists(znode);
    } catch (KeeperException e) {
    } catch (InterruptedException e) {
    }
    return false;
  }

  /**
   * Constructor
   * @param conf
   * @throws IOException
   */
  public ZooKeeperAuthenticator(HBaseConfiguration conf) throws IOException {
    this(conf, new ZooKeeperWrapper(conf, new Watcher() {
      public void process(WatchedEvent event) { }
    }));
    ensureExists(USERS_ZNODE_ROOT);
  }

  /**
   * Constructor
   * @param conf
   * @param wrapper
   * @throws IOException
   */
  public ZooKeeperAuthenticator(HBaseConfiguration conf,
      ZooKeeperWrapper wrapper) throws IOException {
    this.usersZNode = conf.get("stargate.auth.zk.users", USERS_ZNODE_ROOT);
    this.wrapper = wrapper;
    try {
      this.context = new JSONJAXBContext(JSONConfiguration.natural().build(),
        UserModel.class);
      this.unmarshaller = context.createJSONUnmarshaller();
    } catch (Exception e) {
      throw new IOException(e);
    }
  }

  @Override
  public User getUserForToken(String token) throws IOException {
    ZooKeeper zk = wrapper.getZooKeeper();
    try {
      byte[] data = zk.getData(usersZNode + "/" + token, null, null);
      if (data == null) {
        return null;
      }
      UserModel model =
        unmarshaller.unmarshalFromJSON(new ByteArrayInputStream(data),
          UserModel.class);
      return new User(model.name, token, model.admin, model.disabled);
    } catch (KeeperException.NoNodeException e) {
      return null;
    } catch (Exception e) {
      throw new IOException(e);
    }
  }

}
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