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.controller.internal;
  
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.stream.Collectors;
  
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.api.services.RootServiceComponentConfiguration;
  import org.apache.ambari.server.controller.spi.SystemException;
  import org.apache.ambari.server.events.AmbariConfigurationChangedEvent;
  import org.apache.ambari.server.events.publishers.AmbariEventPublisher;
  import org.apache.ambari.server.orm.dao.AmbariConfigurationDAO;
  import org.apache.ambari.server.orm.entities.AmbariConfigurationEntity;
  import org.apache.commons.lang3.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.inject.Inject;
  import com.google.inject.Singleton;
  
  
  /**
   * AmbariServerConfigurationHandler handles Ambari server specific configuration properties.
   */
  @Singleton
  public class AmbariServerConfigurationHandler extends RootServiceComponentConfigurationHandler {
    private static final Logger LOGGER = LoggerFactory.getLogger(AmbariServerConfigurationHandler.class);
  
    private final AmbariConfigurationDAO ambariConfigurationDAO;
    private final AmbariEventPublisher publisher;
  
    @Inject
    AmbariServerConfigurationHandler(AmbariConfigurationDAO ambariConfigurationDAO, AmbariEventPublisher publisher) {
      this.ambariConfigurationDAO = ambariConfigurationDAO;
      this.publisher = publisher;
    }
  
    @Override
    public Map<String, RootServiceComponentConfiguration> getComponentConfigurations(String categoryName) {
      Map<String, RootServiceComponentConfiguration> configurations = null;
  
      List<AmbariConfigurationEntity> entities = (categoryName == null)
          ? ambariConfigurationDAO.findAll()
          : ambariConfigurationDAO.findByCategory(categoryName);
  
      if (entities != null) {
        configurations = new HashMap<>();
        for (AmbariConfigurationEntity entity : entities) {
          String category = entity.getCategoryName();
          RootServiceComponentConfiguration configuration = configurations.get(category);
          if (configuration == null) {
            configuration = new RootServiceComponentConfiguration();
            configurations.put(category, configuration);
          }
  
          configuration.addProperty(entity.getPropertyName(), entity.getPropertyValue());
          if (categoryName != null) {
            configuration.addPropertyType(entity.getPropertyName(), AmbariServerConfigurationUtils.getConfigurationPropertyTypeName(categoryName, entity.getPropertyName()));
          }
        }
      }
  
      return configurations;
    }
  
    @Override
    public void removeComponentConfiguration(String categoryName) {
      if (null == categoryName) {
        LOGGER.debug("No resource id provided in the request");
      } else {
        LOGGER.debug("Deleting Ambari configuration with id: {}", categoryName);
        if (ambariConfigurationDAO.removeByCategory(categoryName) > 0) {
          publisher.publish(new AmbariConfigurationChangedEvent(categoryName));
        }
      }
    }
  
    @Override
    public void updateComponentCategory(String categoryName, Map<String, String> properties, boolean removePropertiesIfNotSpecified) throws AmbariException {
      validateProperties(categoryName, properties);
      final boolean toBePublished = properties.isEmpty() ? false : ambariConfigurationDAO.reconcileCategory(categoryName, properties, removePropertiesIfNotSpecified);
  
      if (toBePublished) {
        // notify subscribers about the configuration changes
        publisher.publish(new AmbariConfigurationChangedEvent(categoryName));
      }
    }
  
    private void validateProperties(String categoryName, Map<String, String> properties) {
      for (String key : properties.keySet()) {
        if (AmbariServerConfigurationUtils.getConfigurationKey(categoryName, key) == null) {
          throw new IllegalArgumentException(String.format("Invalid Ambari server configuration key: %s:%s", categoryName, key));
        }
      }
    }
  
    @Override
    public OperationResult performOperation(String categoryName, Map<String, String> properties,
                                            boolean mergeExistingProperties, String operation,
                                            Map<String, Object> operationParameters) throws SystemException {
      throw new SystemException(String.format("The requested operation is not supported for this category: %s", categoryName));
    }
  
    public Map<String, Map<String, String>> getConfigurations() {
      Map<String, Map<String, String>> configurations = new HashMap<>();
      List<AmbariConfigurationEntity> entities = ambariConfigurationDAO.findAll();
  
      if (entities != null) {
        for (AmbariConfigurationEntity entity : entities) {
          String category = entity.getCategoryName();
          Map<String, String> configuration = configurations.computeIfAbsent(category, k -> new HashMap<>());
          configuration.put(entity.getPropertyName(), entity.getPropertyValue());
        }
      }
  
      return configurations;
    }
  
    /**
     * Get the properties associated with a configuration category
     *
     * @param categoryName the name of the requested category
     * @return a map of property names to values; or null if the data does not exist
     */
    public Map<String, String> getConfigurationProperties(String categoryName) {
      Map<String, String> properties = null;
  
      List<AmbariConfigurationEntity> entities = ambariConfigurationDAO.findByCategory(categoryName);
      if (entities != null) {
        properties = new HashMap<>();
        for (AmbariConfigurationEntity entity : entities) {
          properties.put(entity.getPropertyName(), entity.getPropertyValue());
        }
      }
  
      return properties;
    }
  
    protected Set<String> getEnabledServices(String categoryName, String manageServicesConfigurationPropertyName, String enabledServicesPropertyName) {
      final Map<String, String> configurationProperties = getConfigurationProperties(categoryName);
      final boolean manageConfigurations = StringUtils.isNotBlank(manageServicesConfigurationPropertyName)
          && "true".equalsIgnoreCase(configurationProperties.get(manageServicesConfigurationPropertyName));
      final String enabledServices = (manageConfigurations) ? configurationProperties.get(enabledServicesPropertyName) : null;
  
      if (StringUtils.isEmpty(enabledServices)) {
        return Collections.emptySet();
      } else {
        return Arrays.stream(enabledServices.split(",")).map(String::trim).map(String::toUpperCase).collect(Collectors.toSet());
      }
    }
  }
  