/**
    *
    * 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.zookeeper;
  
  import java.util.List;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.conf.Configured;
  import org.apache.hadoop.hbase.HBaseConfiguration;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.util.Tool;
  import org.apache.hadoop.util.ToolRunner;
  import org.apache.zookeeper.ZooDefs;
  import org.apache.zookeeper.ZooKeeper;
  
  /**
   * You may add the jaas.conf option
   *    -Djava.security.auth.login.config=/PATH/jaas.conf
   *
   * You may also specify -D to set options
   *    "hbase.zookeeper.quorum"    (it should be in hbase-site.xml)
   *    "zookeeper.znode.parent"    (it should be in hbase-site.xml)
   *
   * Use -set-acls to set the ACLs, no option to erase ACLs
   */
  @InterfaceAudience.Private
  public class ZkAclReset extends Configured implements Tool {
    private static final Log LOG = LogFactory.getLog(ZkAclReset.class);
  
    private static void resetAcls(final ZooKeeperWatcher zkw, final String znode,
        final boolean eraseAcls) throws Exception {
      List<String> children = ZKUtil.listChildrenNoWatch(zkw, znode);
      if (children != null) {
        for (String child: children) {
          resetAcls(zkw, ZKUtil.joinZNode(znode, child), eraseAcls);
        }
      }
  
      ZooKeeper zk = zkw.getRecoverableZooKeeper().getZooKeeper();
      if (eraseAcls) {
        LOG.info(" - erase ACLs for " + znode);
        zk.setACL(znode, ZooDefs.Ids.OPEN_ACL_UNSAFE, -1);
      } else {
        LOG.info(" - set ACLs for " + znode);
        zk.setACL(znode, ZKUtil.createACL(zkw, znode, true), -1);
      }
    }
  
    private static void resetAcls(final Configuration conf, boolean eraseAcls)
        throws Exception {
      ZooKeeperWatcher zkw = new ZooKeeperWatcher(conf, "ZkAclReset", null);
      try {
        LOG.info((eraseAcls ? "Erase" : "Set") + " HBase ACLs for " +
                  zkw.getQuorum() + " " + zkw.getBaseZNode());
        resetAcls(zkw, zkw.getBaseZNode(), eraseAcls);
      } finally {
        zkw.close();
      }
    }
  
    private void printUsageAndExit() {
      System.err.printf("Usage: bin/hbase %s [options]%n", getClass().getName());
      System.err.println(" where [options] are:");
      System.err.println("  -h|-help                Show this help and exit.");
      System.err.println("  -set-acls               Setup the hbase znode ACLs for a secure cluster");
      System.err.println();
      System.err.println("Examples:");
      System.err.println("  To reset the ACLs to the unsecure cluster behavior:");
      System.err.println("  hbase " + getClass().getName());
      System.err.println();
      System.err.println("  To reset the ACLs to the secure cluster behavior:");
      System.err.println("  hbase " + getClass().getName() + " -set-acls");
      System.exit(1);
    }
  
    @Override
    public int run(String[] args) throws Exception {
      boolean eraseAcls = true;
  
      for (int i = 0; i < args.length; ++i) {
       if (args[i].equals("-help")) {
         printUsageAndExit();
       } else if (args[i].equals("-set-acls")) {
         eraseAcls = false;
       } else {
         printUsageAndExit();
       }
     }
 
     resetAcls(getConf(), eraseAcls);
     return(0);
   }
 
   public static void main(String[] args) throws Exception {
     System.exit(ToolRunner.run(HBaseConfiguration.create(), new ZkAclReset(), args));
   }
 }