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.bifromq.mqtt.handler;
  
  import static org.apache.bifromq.plugin.eventcollector.ThreadLocalEventPool.getLocal;
  
  import org.apache.bifromq.mqtt.handler.condition.Condition;
  import org.apache.bifromq.plugin.eventcollector.IEventCollector;
  import org.apache.bifromq.plugin.eventcollector.mqttbroker.channelclosed.ChannelError;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.ChannelInboundHandlerAdapter;
  import lombok.extern.slf4j.Slf4j;
  
  @Slf4j
  public class ConditionalRejectHandler extends ChannelInboundHandlerAdapter {
      public static final String NAME = "ConditionalRejectHandler";
      private final Condition rejectCondition;
      private final IEventCollector eventCollector;
  
      public ConditionalRejectHandler(Condition rejectCondition, IEventCollector eventCollector) {
          this.rejectCondition = rejectCondition;
          this.eventCollector = eventCollector;
      }
  
      @Override
      public void channelActive(ChannelHandlerContext ctx) throws Exception {
          if (rejectCondition.meet()) {
              log.debug("Reject connection due to {}: remote={}", rejectCondition, ctx.channel().remoteAddress());
              // ensure no read will happen
              ctx.channel().config().setAutoRead(false);
              ctx.close();
              eventCollector.report(getLocal(ChannelError.class)
                  .peerAddress(ChannelAttrs.socketAddress(ctx.channel()))
                  .cause(new RuntimeException("Reject connection due to " + rejectCondition)));
              return;
          }
          super.channelActive(ctx);
      }
  }
  