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.audit.request.eventcreator;
  
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import org.apache.ambari.server.api.services.NamedPropertySet;
  import org.apache.ambari.server.api.services.Request;
  import org.apache.ambari.server.api.services.Result;
  import org.apache.ambari.server.api.services.ResultStatus;
  import org.apache.ambari.server.audit.event.AuditEvent;
  import org.apache.ambari.server.audit.event.request.AddComponentToHostRequestAuditEvent;
  import org.apache.ambari.server.audit.event.request.AddHostRequestAuditEvent;
  import org.apache.ambari.server.audit.event.request.DeleteHostRequestAuditEvent;
  import org.apache.ambari.server.controller.internal.HostComponentResourceProvider;
  import org.apache.ambari.server.controller.internal.HostResourceProvider;
  import org.apache.ambari.server.controller.spi.Resource;
  
  import com.google.common.collect.ImmutableSet;
  import com.google.common.collect.Iterables;
  
  /**
   * This creator handles host requests (add, delete, add component)
   * For resource type {@link Resource.Type#HostComponent}
   * and request types {@link Request.Type#POST}, {@link Request.Type#DELETE} and {@link Request.Type#QUERY_POST}
   */
  public class HostEventCreator implements RequestAuditEventCreator {
  
    /**
     * Set of {@link Request.Type}s that are handled by this plugin
     */
    private Set<Request.Type> requestTypes = ImmutableSet.<Request.Type>builder().add(Request.Type.QUERY_POST, Request.Type.POST, Request.Type.DELETE).build();
  
    /**
     * Set of {@link Resource.Type}s that are handled by this plugin
     */
    private Set<Resource.Type> resourceTypes = ImmutableSet.<Resource.Type>builder().add(Resource.Type.Host).build();
  
    /**
     * Pattern to retrieve hostname from url
     */
    private static final Pattern HOSTNAME_PATTERN = Pattern.compile(".*" + HostResourceProvider.HOST_HOST_NAME_PROPERTY_ID + "\\s*=\\s*([^&\\s]+).*");
  
    /**
     * {@inheritDoc}
     */
    @Override
    public Set<Request.Type> getRequestTypes() {
      return requestTypes;
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public Set<Resource.Type> getResourceTypes() {
      return resourceTypes;
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public Set<ResultStatus.STATUS> getResultStatuses() {
      // null makes this default
      return null;
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public AuditEvent createAuditEvent(Request request, Result result) {
  
      switch (request.getRequestType()) {
        case DELETE:
          return DeleteHostRequestAuditEvent.builder()
            .withTimestamp(System.currentTimeMillis())
            .withRequestType(request.getRequestType())
            .withResultStatus(result.getStatus())
            .withUrl(request.getURI())
            .withRemoteIp(request.getRemoteAddress())
            .withHostName(request.getResource().getKeyValueMap().get(Resource.Type.Host))
            .build();
        case POST:
          return AddHostRequestAuditEvent.builder()
            .withTimestamp(System.currentTimeMillis())
            .withRequestType(request.getRequestType())
            .withResultStatus(result.getStatus())
            .withUrl(request.getURI())
            .withRemoteIp(request.getRemoteAddress())
            .withHostName(RequestAuditEventCreatorHelper.getNamedProperty(request, HostResourceProvider.HOST_HOST_NAME_PROPERTY_ID))
            .build();
        case QUERY_POST:
          return AddComponentToHostRequestAuditEvent.builder()
            .withTimestamp(System.currentTimeMillis())
            .withRequestType(request.getRequestType())
            .withResultStatus(result.getStatus())
            .withUrl(request.getURI())
            .withRemoteIp(request.getRemoteAddress())
            .withHostName(getHostNameFromQuery(request))
            .withComponents(getHostComponents(request))
            .build();
        default:
          return null;
      }
    }
  
    /**
     * Returns component name from the request
     * @param request
     * @return
     */
    private Set<String> getHostComponents(Request request) {
      Set<String> components = new HashSet<>();
      NamedPropertySet propertySet = Iterables.getFirst(request.getBody().getNamedPropertySets(), null);
      if (propertySet != null && propertySet.getProperties().get("host_components") instanceof Set) {
        Set<Map<String, String>> set = (Set<Map<String, String>>) propertySet.getProperties().get("host_components");
        if (set != null && !set.isEmpty()) {
          for(Map<String, String> element : set) {
            components.add(element.get(HostComponentResourceProvider.COMPONENT_NAME));
          }
        }
      }
      return components;
    }
  
    /**
     * Returns hostname from the query string of the request
     * @param request
     * @return
     */
    private String getHostNameFromQuery(Request request) {
      Matcher matcher = HOSTNAME_PATTERN.matcher(request.getURI());
      if(matcher.find()) {
        return matcher.group(1);
      }
      return null;
    }
  }
  