/**
 * 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.yarn.server.timeline.security;

import javax.servlet.FilterConfig;
import javax.servlet.ServletException;

import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager;
import org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticationFilter;
import org.apache.hadoop.yarn.security.client.TimelineDelegationTokenIdentifier;

/**
 * Timeline authentication filter provides delegation token support for ATSv1
 * and ATSv2.
 */
@Private
@Unstable
public class TimelineAuthenticationFilter
    extends DelegationTokenAuthenticationFilter {

  private static AbstractDelegationTokenSecretManager
      <TimelineDelegationTokenIdentifier> secretManager;

  @Override
  public void init(FilterConfig filterConfig) throws ServletException {
    filterConfig.getServletContext().setAttribute(
        DelegationTokenAuthenticationFilter.
            DELEGATION_TOKEN_SECRET_MANAGER_ATTR, secretManager);
    super.init(filterConfig);
  }

  public static void setTimelineDelegationTokenSecretManager(
      AbstractDelegationTokenSecretManager
          <TimelineDelegationTokenIdentifier> secretMgr) {
    TimelineAuthenticationFilter.secretManager = secretMgr;
  }
}
