/**
* 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 interfaces and classes that can be used to implement custom authorization for hive.
*
* How hive code uses this interface:
* The interface that hive code invokes is HiveAuthorizer class.
* The classes HivePrincipal, HivePrivilege, HivePrivilegeObject, HivePrivilegeInfo, HiveOperationType
* are arguments used in the authorization interface.
* The methods in the interface throws two types of exceptions - HiveAuthzPluginException (in
* case of internal errors), and HiveAuthzPluginDeniedException (when action is not permitted
* because authorization has failed).
*
* Hive uses the HiveAuthorizerFactory interface, whose implementing class is configurable through
* hive configuration, to instantiate an instance of this interface.
*
*
* Guide on implementing the interface:
* There are two categories of operations to be done by the authorization interface, one is the
* actions performed by the access control statements, which updates the privileges that have
* been granted (and stores in some where like metastore database), and also retrieves the current
* state of privileges. You may choose not to implement this part and juse a no-op implementation
* if you are going to manage the authorization externally (eg, if you base it on mapping to
* file system permissions).
* The 2nd category of operation is authorizing the hive actions by checking against the privileges
* the user has on the objects.
* HiveAccessController has the interface for the first type of operations and
* HiveAuthorizationValidator has interface for second type of operations.
*
* HiveAuthorizerImpl is a convenience class that you can use by just passing the implementations
* of these two interfaces (HiveAuthorizerImpl, HiveAuthorizationValidator) in the constructor.
*
*/
package org.apache.hadoop.hive.ql.security.authorization.plugin;