content: /*
   * 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.ambari.server.serveraction.kerberos;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentMap;
  
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.actionmanager.HostRoleStatus;
  import org.apache.ambari.server.agent.CommandReport;
  import org.apache.ambari.server.controller.internal.ArtifactResourceProvider;
  import org.apache.ambari.server.controller.internal.RequestImpl;
  import org.apache.ambari.server.controller.spi.ClusterController;
  import org.apache.ambari.server.controller.spi.NoSuchResourceException;
  import org.apache.ambari.server.controller.spi.Predicate;
  import org.apache.ambari.server.controller.spi.Resource;
  import org.apache.ambari.server.controller.spi.ResourceProvider;
  import org.apache.ambari.server.controller.utilities.ClusterControllerHelper;
  import org.apache.ambari.server.controller.utilities.PredicateBuilder;
  import org.apache.ambari.server.serveraction.kerberos.stageutils.ResolvedKerberosPrincipal;
  import org.apache.ambari.server.state.Cluster;
  import org.apache.ambari.server.state.SecurityType;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Used to perform Kerberos Cleanup Operations as part of the Unkerberization process
   */
  public class CleanupServerAction extends KerberosServerAction {
  
    private final static Logger LOG = LoggerFactory.getLogger(CleanupServerAction.class);
  
    @Override
    protected boolean pruneServiceFilter() {
      return false;
    }
  
    /**
     * Processes an identity as necessary.
     * <p/>
     * This method is not used since the {@link #processIdentities(java.util.Map)} is not invoked
     *
     * @param resolvedPrincipal        a ResolvedKerberosPrincipal object to process
     * @param operationHandler         a KerberosOperationHandler used to perform Kerberos-related
     *                                 tasks for specific Kerberos implementations
     *                                 (MIT, Active Directory, etc...)
     * @param kerberosConfiguration    a Map of configuration properties from kerberos-env
     * @param includedInFilter         a Boolean value indicating whather the principal is included in
     *                                 the current filter or not
     * @param requestSharedDataContext a Map to be used a shared data among all ServerActions related
     *                                 to a given request
     * @return null, always
     * @throws AmbariException if an error occurs while processing the identity record
     */
    @Override
    protected CommandReport processIdentity(ResolvedKerberosPrincipal resolvedPrincipal,
                                            KerberosOperationHandler operationHandler,
                                            Map<String, String> kerberosConfiguration,
                                            boolean includedInFilter,
                                            Map<String, Object> requestSharedDataContext)
        throws AmbariException {
      return null;
    }
  
    /**
     * @param requestSharedDataContext a Map to be used a shared data among all ServerActions related
     *                                 to a given request
     * @return
     * @throws AmbariException
     * @throws InterruptedException
     */
    @Override
    public CommandReport execute(ConcurrentMap<String, Object> requestSharedDataContext) throws AmbariException, InterruptedException {
  
      Cluster cluster = getCluster();
      if (cluster.getSecurityType().equals(SecurityType.NONE)) { // double check this is done in a non secure environment
        removeKerberosArtifact(cluster);
      }
  
      return createCommandReport(0, HostRoleStatus.COMPLETED, "{}", actionLog.getStdOut(), actionLog.getStdErr());
    }
  
    /**
     * Removes the Kerberos descriptor artifact from the database
     *
     * @param cluster targeted for the remove process
     * @throws AmbariException
     */
    private void removeKerberosArtifact(Cluster cluster) throws AmbariException {
      PredicateBuilder pb = new PredicateBuilder();
      Predicate predicate = pb.begin().property("Artifacts/cluster_name").equals(cluster.getClusterName()).and().
        property(ArtifactResourceProvider.ARTIFACT_NAME_PROPERTY).equals("kerberos_descriptor").
        end().toPredicate();
  
      ClusterController clusterController = ClusterControllerHelper.getClusterController();
  
      ResourceProvider artifactProvider = clusterController.ensureResourceProvider(Resource.Type.Artifact);
  
      try {
        artifactProvider.deleteResources(new RequestImpl(null, null, null, null), predicate);
        LOG.info("Kerberos descriptor removed successfully.");
        actionLog.writeStdOut("Kerberos descriptor removed successfully.");
      } catch (NoSuchResourceException e) {
        LOG.warn("The Kerberos descriptor was not found in the database while attempting to remove.");
        actionLog.writeStdOut("The Kerberos descriptor was not found in the database while attempting to remove.");
      } catch (Exception e) {
        throw new AmbariException("An unknown error occurred while trying to delete the cluster Kerberos descriptor", e);
      }
    }
  
  }
  