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/*
* Copyright 2008-present MongoDB, Inc.
*
* Licensed 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 com.mongodb;
import com.mongodb.annotations.ThreadSafe;
import com.mongodb.lang.Nullable;
import javax.security.auth.Subject;
import javax.security.auth.login.LoginException;
import java.security.PrivilegedAction;
/**
* This interface enables applications to take full control of the lifecycle of the {@link Subject} with which authentication requests
* are executed. For each authentication request, the driver will call the {@link #getSubject()} method and execute the SASL
* conversation via a call to {@link Subject#doAs(Subject, PrivilegedAction)}.
*
* Implementations of this interface will typically cache a {@code Subject} instance for some period of time before replacing it with a
* different instance, say, after the expiration time of a ticket has passed.
*
*
* Applications should register an instance of a class implementation this interface as a mechanism property of a {@link MongoCredential}
* via a call to {@link MongoCredential#withMechanismProperty(String, Object)} using the key
* {@link MongoCredential#JAVA_SUBJECT_PROVIDER_KEY}
*
*
* If use of the same {@code Subject} for the lifetime of the application is sufficient, an application can simply create a single
* {@code Subject} and associate it with a {@code MongoCredential} as a mechanism property using the key
* {@link MongoCredential#JAVA_SUBJECT_KEY}.
*
*
* @see MongoCredential
* @see MongoCredential#JAVA_SUBJECT_PROVIDER_KEY
* @since 4.2
*/
@ThreadSafe
public interface SubjectProvider {
/**
* Gets the Subject to use for an authentication request.
*
* @return the {@code Subject}, which may be null
* @throws LoginException a login exception
*/
@Nullable
Subject getSubject() throws LoginException;
}