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.kafka.connect.mirror;
  
  import org.apache.kafka.common.config.AbstractConfig;
  import org.apache.kafka.common.config.ConfigDef;
  import org.apache.kafka.common.config.ConfigDef.Importance;
  import org.apache.kafka.common.config.ConfigDef.Type;
  
  import java.util.Map;
  import java.util.regex.Pattern;
  
  /** Filters excluded property names or regexes. */
  public class DefaultConfigPropertyFilter implements ConfigPropertyFilter {
      
      public static final String CONFIG_PROPERTIES_EXCLUDE_CONFIG = "config.properties.exclude";
      public static final String USE_DEFAULTS_FROM = "use.defaults.from";
      private static final String USE_DEFAULTS_FROM_DOC = "Which cluster's defaults (source or target) to use "
                                                          + "when syncing topic configurations that have default values.";
      private static final String USE_DEFAULTS_FROM_DEFAULT = "target";
  
      private static final String CONFIG_PROPERTIES_EXCLUDE_DOC = "List of topic configuration properties and/or regexes "
                                                                  + "that should not be replicated.";
      public static final String CONFIG_PROPERTIES_EXCLUDE_DEFAULT = "follower\\.replication\\.throttled\\.replicas, "
                                                                     + "leader\\.replication\\.throttled\\.replicas, "
                                                                     + "message\\.timestamp\\.difference\\.max\\.ms, "
                                                                     + "message\\.timestamp\\.type, "
                                                                     + "unclean\\.leader\\.election\\.enable, "
                                                                     + "min\\.insync\\.replicas";
      private Pattern excludePattern = MirrorUtils.compilePatternList(CONFIG_PROPERTIES_EXCLUDE_DEFAULT);
      private String useDefaultsFrom = USE_DEFAULTS_FROM_DEFAULT;
  
      @Override
      public void configure(Map<String, ?> props) {
          ConfigPropertyFilterConfig config = new ConfigPropertyFilterConfig(props);
          excludePattern = config.excludePattern();
          useDefaultsFrom = config.useDefaultsFrom();
      }
  
      private boolean excluded(String prop) {
          return excludePattern != null && excludePattern.matcher(prop).matches();
      }
  
      @Override
      public boolean shouldReplicateConfigProperty(String prop) {
          return !excluded(prop);
      }
  
      @Override
      public boolean shouldReplicateSourceDefault(String prop) {
          return useDefaultsFrom.equals("source");
      }
  
      static class ConfigPropertyFilterConfig extends AbstractConfig {
  
          static final ConfigDef DEF = new ConfigDef()
              .define(CONFIG_PROPERTIES_EXCLUDE_CONFIG,
                      Type.LIST,
                      CONFIG_PROPERTIES_EXCLUDE_DEFAULT,
                      Importance.HIGH,
                      CONFIG_PROPERTIES_EXCLUDE_DOC)
              .define(USE_DEFAULTS_FROM,
                      Type.STRING,
                      USE_DEFAULTS_FROM_DEFAULT,
                      Importance.MEDIUM,
                      USE_DEFAULTS_FROM_DOC);
  
  
          ConfigPropertyFilterConfig(Map<String, ?> props) {
              super(DEF, props, false);
          }
  
          Pattern excludePattern() {
              return MirrorUtils.compilePatternList(getList(CONFIG_PROPERTIES_EXCLUDE_CONFIG));
          }
  
          String useDefaultsFrom() {
              return getString(USE_DEFAULTS_FROM);
          }
      }
  }
  