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.camel.component.nats;
  
  import java.io.IOException;
  import java.security.GeneralSecurityException;
  import java.util.concurrent.ExecutorService;
  
  import javax.net.ssl.SSLContext;
  
  import io.nats.client.Connection;
  import io.nats.client.Nats;
  import io.nats.client.Options;
  import io.nats.client.Options.Builder;
  import org.apache.camel.Category;
  import org.apache.camel.Consumer;
  import org.apache.camel.MultipleConsumersSupport;
  import org.apache.camel.Processor;
  import org.apache.camel.Producer;
  import org.apache.camel.spi.EndpointServiceLocation;
  import org.apache.camel.spi.HeaderFilterStrategy;
  import org.apache.camel.spi.HeaderFilterStrategyAware;
  import org.apache.camel.spi.UriEndpoint;
  import org.apache.camel.spi.UriParam;
  import org.apache.camel.support.DefaultEndpoint;
  import org.apache.camel.support.ResourceHelper;
  import org.apache.camel.util.ObjectHelper;
  
  /**
   * Send and receive messages from <a href="http://nats.io/">NATS</a> messaging system.
   */
  @UriEndpoint(firstVersion = "2.17.0", scheme = "nats", title = "Nats", syntax = "nats:topic", category = { Category.MESSAGING },
               headersClass = NatsConstants.class)
  public class NatsEndpoint extends DefaultEndpoint
          implements MultipleConsumersSupport, HeaderFilterStrategyAware, EndpointServiceLocation {
  
      @UriParam
      private NatsConfiguration configuration;
  
      public NatsEndpoint(String uri, NatsComponent component, NatsConfiguration config) {
          super(uri, component);
          this.configuration = config;
      }
  
      @Override
      public Producer createProducer() throws Exception {
          return new NatsProducer(this);
      }
  
      @Override
      public Consumer createConsumer(Processor processor) throws Exception {
          NatsConsumer consumer = new NatsConsumer(this, processor);
          configureConsumer(consumer);
          return consumer;
      }
  
      @Override
      public boolean isMultipleConsumersSupported() {
          return true;
      }
  
      @Override
      public String getServiceUrl() {
          return getConfiguration().getServers();
      }
  
      @Override
      public String getServiceProtocol() {
          return "nats";
      }
  
      public ExecutorService createExecutor(Object source) {
          return getCamelContext().getExecutorServiceManager().newFixedThreadPool(source,
                  "NatsTopic[" + configuration.getTopic() + "]", configuration.getPoolSize());
      }
  
      public NatsConfiguration getConfiguration() {
          return configuration;
      }
  
      public Connection getConnection()
              throws InterruptedException, IllegalArgumentException, GeneralSecurityException, IOException {
          Builder builder = getConfiguration().createOptions();
          if (getConfiguration().getSslContextParameters() != null && getConfiguration().isSecure()) {
              SSLContext sslCtx = getConfiguration().getSslContextParameters().createSSLContext(getCamelContext());
              builder.sslContext(sslCtx);
          }
          if (ObjectHelper.isNotEmpty(getConfiguration().getCredentialsFilePath())) {
              builder.authHandler(Nats.staticCredentials(
                      ResourceHelper.resolveResource(getCamelContext(), getConfiguration().getCredentialsFilePath())
                              .getInputStream().readAllBytes()));
          }
          Options options = builder.build();
          return Nats.connect(options);
      }
  
      @Override
      public HeaderFilterStrategy getHeaderFilterStrategy() {
          return getConfiguration().getHeaderFilterStrategy();
      }
  
      @Override
      public void setHeaderFilterStrategy(HeaderFilterStrategy strategy) {
          this.getConfiguration().setHeaderFilterStrategy(strategy);
      }
  }
  