/*
 * 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.drill.exec.rpc.security;

import com.google.common.base.Strings;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CommonConfigurationKeys;

import java.io.InputStream;
import java.util.Properties;


public class SecurityConfiguration extends Configuration {
  //private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(SecurityConfiguration.class);

  static {
    Properties prop = new Properties();
    try {
      // Load the properties file containing the namespace prefix based on profile used
      // to build jdbc-all package. This prefix is used to add on certain Hadoop classes class path.
      final InputStream inputStream = SecurityConfiguration.class.getClassLoader().getResourceAsStream("profile.props");

      // For null inputStream prop.load() throws NullPointerException
      // Get the property value and set it in system property
      prop.load(inputStream);
      System.setProperty("drill.security.namespacePrefix", prop.getProperty("package.namespace.prefix").trim());

    } catch (Exception ex) {
      // Ignore the exception which means that property value will be null and is handled in consumer of System Property
    }
  }

  public SecurityConfiguration() {
    super();
    updateGroupMapping();
  }

  /**
   * Update the GroupMapping class name to add namespace prefix retrieved from System Property. This is needed since
   * in drill-jdbc-all jar we are packaging hadoop dependencies under that namespace. This will help application
   * using this jar as driver to avoid conflict with it's own hadoop dependency if any. The property is needed only
   * when Hadoop classes are relocated to different namespace which is done inside jdbc-all package.
   */
  private void updateGroupMapping() {
    final String originalClassName = get(CommonConfigurationKeys.HADOOP_SECURITY_GROUP_MAPPING);
    final String profilePrefix = System.getProperty("drill.security.namespacePrefix");

    if (originalClassName != null && !Strings.isNullOrEmpty(profilePrefix) && !originalClassName.startsWith(profilePrefix)) {
      set(CommonConfigurationKeys.HADOOP_SECURITY_GROUP_MAPPING, profilePrefix + originalClassName);
    }
  }
}