code: /*
   * Copyright (c) 2022 Airbyte, Inc., all rights reserved.
   */
  
  package io.airbyte.integrations.base.ssh;
  
  import com.fasterxml.jackson.databind.JsonNode;
  import com.fasterxml.jackson.databind.node.ObjectNode;
  import io.airbyte.commons.json.Jsons;
  import io.airbyte.commons.resources.MoreResources;
  import io.airbyte.integrations.base.AirbyteMessageConsumer;
  import io.airbyte.integrations.base.Destination;
  import io.airbyte.protocol.models.AirbyteConnectionStatus;
  import io.airbyte.protocol.models.AirbyteMessage;
  import io.airbyte.protocol.models.ConfiguredAirbyteCatalog;
  import io.airbyte.protocol.models.ConnectorSpecification;
  import java.util.List;
  import java.util.function.Consumer;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Decorates a Destination with an SSH Tunnel using the standard configuration that Airbyte uses for
   * configuring SSH.
   */
  public class SshWrappedDestination implements Destination {
  
    private static final Logger LOGGER = LoggerFactory.getLogger(SshWrappedDestination.class);
  
    private final Destination delegate;
    private final List<String> hostKey;
    private final List<String> portKey;
  
    public SshWrappedDestination(final Destination delegate,
                                 final List<String> hostKey,
                                 final List<String> portKey) {
      this.delegate = delegate;
      this.hostKey = hostKey;
      this.portKey = portKey;
    }
  
    @Override
    public ConnectorSpecification spec() throws Exception {
      // inject the standard ssh configuration into the spec.
      final ConnectorSpecification originalSpec = delegate.spec();
      final ObjectNode propNode = (ObjectNode) originalSpec.getConnectionSpecification().get("properties");
      propNode.set("tunnel_method", Jsons.deserialize(MoreResources.readResource("ssh-tunnel-spec.json")));
      return originalSpec;
    }
  
    @Override
    public AirbyteConnectionStatus check(final JsonNode config) throws Exception {
      return SshTunnel.sshWrap(config, hostKey, portKey, delegate::check);
    }
  
    @Override
    public AirbyteMessageConsumer getConsumer(final JsonNode config,
                                              final ConfiguredAirbyteCatalog catalog,
                                              final Consumer<AirbyteMessage> outputRecordCollector)
        throws Exception {
      final SshTunnel tunnel = SshTunnel.getInstance(config, hostKey, portKey);
      final AirbyteMessageConsumer delegateConsumer;
      try {
        delegateConsumer = delegate.getConsumer(tunnel.getConfigInTunnel(), catalog, outputRecordCollector);
      } catch (final Exception e) {
        LOGGER.error("Exception occurred while getting the delegate consumer, closing SSH tunnel", e);
        tunnel.close();
        throw e;
      }
      return AirbyteMessageConsumer.appendOnClose(delegateConsumer, tunnel::close);
    }
  
  }
  