/*
 * 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.registry.client.impl.zk;

import org.apache.zookeeper.ZooDefs;

/**
 * Internal constants for the registry.
 *
 * These are the things which aren't visible to users.
 *
 */
public interface RegistryInternalConstants {

  /**
   * Pattern of a single entry in the registry path. : {@value}.
   * <p>
   * This is what constitutes a valid hostname according to current RFCs.
   * Alphanumeric first two and last one digit, alphanumeric
   * and hyphens allowed in between.
   * <p>
   * No upper limit is placed on the size of an entry.
   */
  String VALID_PATH_ENTRY_PATTERN =
      "([a-z0-9]|[a-z0-9][a-z0-9\\-]*[a-z0-9])";

  /**
   * Permissions for readers: {@value}.
   */
  int PERMISSIONS_REGISTRY_READERS = ZooDefs.Perms.READ;

  /**
   * Permissions for system services: {@value}
   */
  int PERMISSIONS_REGISTRY_SYSTEM_SERVICES = ZooDefs.Perms.ALL;

  /**
   * Permissions for a user's root entry: {@value}.
   * All except the admin permissions (ACL access) on a node
   */
  int PERMISSIONS_REGISTRY_USER_ROOT =
      ZooDefs.Perms.READ | ZooDefs.Perms.WRITE | ZooDefs.Perms.CREATE |
      ZooDefs.Perms.DELETE;

  /**
   * Name of the SASL auth provider which has to be added to ZK server to enable
   * sasl: auth patterns: {@value}.
   *
   * Without this callers can connect via SASL, but
   * they can't use it in ACLs
   */
  String SASLAUTHENTICATION_PROVIDER =
      "org.apache.zookeeper.server.auth.SASLAuthenticationProvider";

  /**
   * String to use as the prefix when declaring a new auth provider: {@value}.
   */
  String ZOOKEEPER_AUTH_PROVIDER = "zookeeper.authProvider";

  /**
   * This the Hadoop environment variable which propagates the identity
   * of a user in an insecure cluster
   */
  String HADOOP_USER_NAME = "HADOOP_USER_NAME";
}