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.quarkus.component.snmp.it;
  
  import java.util.Deque;
  import java.util.List;
  import java.util.Map;
  import java.util.stream.Collectors;
  
  import jakarta.enterprise.context.ApplicationScoped;
  import jakarta.inject.Inject;
  import jakarta.inject.Named;
  import jakarta.ws.rs.POST;
  import jakarta.ws.rs.Path;
  import jakarta.ws.rs.PathParam;
  import jakarta.ws.rs.Produces;
  import jakarta.ws.rs.QueryParam;
  import jakarta.ws.rs.core.MediaType;
  import jakarta.ws.rs.core.Response;
  import org.apache.camel.ConsumerTemplate;
  import org.apache.camel.Exchange;
  import org.apache.camel.ProducerTemplate;
  import org.apache.camel.component.snmp.SnmpMessage;
  import org.eclipse.microprofile.config.inject.ConfigProperty;
  import org.snmp4j.PDU;
  import org.snmp4j.PDUv1;
  import org.snmp4j.ScopedPDU;
  import org.snmp4j.mp.SnmpConstants;
  import org.snmp4j.smi.OID;
  import org.snmp4j.smi.OctetString;
  import org.snmp4j.smi.TimeTicks;
  import org.snmp4j.smi.Variable;
  import org.snmp4j.smi.VariableBinding;
  
  @Path("/snmp")
  @ApplicationScoped
  public class SnmpResource {
  
      @ConfigProperty(name = SnmpRoute.TRAP_V0_PORT)
      int trap0Port;
  
      @ConfigProperty(name = SnmpRoute.TRAP_V1_PORT)
      int trap1Port;
  
      @ConfigProperty(name = SnmpRoute.TRAP_V3_PORT)
      int trap3Port;
  
      @ConfigProperty(name = "snmpListenAddress")
      String snmpListenAddress;
  
      @Inject
      @Named("snmpTrapResults")
      Map<String, Deque<SnmpMessage>> snmpResults;
  
      @Inject
      ConsumerTemplate consumerTemplate;
  
      @Inject
      ProducerTemplate producerTemplate;
  
      @Path("/producePDU/{version}")
      @POST
      @Produces(MediaType.TEXT_PLAIN)
      public Response producePDU(@PathParam("version") int version,
              @QueryParam("urlAppend") String urlAppend,
              String payload) {
          String url = String.format("snmp://%s?retries=1&snmpVersion=%d", snmpListenAddress, version);
          if (urlAppend != null) {
              url = url + urlAppend;
          }
  
          SnmpMessage pdu = producerTemplate.requestBody(url, version, SnmpMessage.class);
  
          String response = pdu.getSnmpMessage().getVariableBindings().stream()
                  .map(vb -> vb.getVariable().toString())
                  .collect(Collectors.joining());
  
          return Response.ok(response).build();
      }
  
      @Path("/getNext/{version}")
      @POST
      @Produces(MediaType.TEXT_PLAIN)
      public Response getNext(String payload,
              @QueryParam("urlAppend") String urlAppend,
              @PathParam("version") int version) {
          String url = String.format("snmp://%s?type=GET_NEXT&retries=1&protocol=udp&oids=%s&snmpVersion=%d", snmpListenAddress,
                  payload, version);
          if (urlAppend != null) {
              url = url + urlAppend;
          }
  
          @SuppressWarnings("unchecked")
          List<SnmpMessage> pdu = producerTemplate.requestBody(url, "", List.class);
  
          String response = pdu.stream()
                  .flatMap(m -> m.getSnmpMessage().getVariableBindings().stream())
                  //snmp may add null oid to the result - because responder supports v3
                  // (see https://camel.apache.org/components/3.20.x/snmp-component.html#_the_result_of_a_poll)
                  .filter(vb -> !"Null".equals(vb.getVariable().toString()))
                  .map(vb -> vb.getVariable().toString())
                  .collect(Collectors.joining(","));
  
          return Response.ok(response).build();
      }
  
      @Path("/produceTrap/{version}")
      @POST
      @Produces(MediaType.TEXT_PLAIN)
      public Response produceTrap(String payload,
              @QueryParam("urlAppend") String urlAppend,
              @PathParam("version") int version) {
          int port = new int[] { trap0Port, trap1Port, -1, trap3Port }[version];
          String url = "snmp:127.0.0.1:" + port + "?protocol=udp&type=TRAP&snmpVersion=" + version;
          if (urlAppend != null) {
              url = url + urlAppend;
          }
          PDU trap = createTrap(payload, version);
  
          producerTemplate.sendBody(url, trap);
  
          return Response.ok().build();
      }
  
      @Path("/poll/{version}")
      @POST
      @Produces(MediaType.TEXT_PLAIN)
      public Response poll(@PathParam("version") int version,
              @QueryParam("urlAppend") String urlAppend,
              String oid) {
          String url = String.format("snmp:%s?protocol=udp&snmpVersion=%d&type=POLL&oids=%s", snmpListenAddress, version, oid);
          if (urlAppend != null) {
              url = url + urlAppend;
          }
  
          //Even if routeBuilder is preferred instead of consumerTemplate, consumerTemplete can be used in a case, when the component uses polling consumers by default.
          // In this case:
          // - only polling consumer is used by the SNMP component
          // - usage of the consumerTemplate reduces a lot of requests between SNMP providers significantly, thus making the tests more stable.
          Exchange e = consumerTemplate.receive(url);
  
          String result = e.getIn().getBody(SnmpMessage.class).getSnmpMessage().getVariableBindings().stream()
                  //snmp may add null oid to the result - because responder supports v3
                  // (see https://camel.apache.org/components/3.20.x/snmp-component.html#_the_result_of_a_poll)
                  .filter(vb -> !"Null".equals(vb.getVariable().toString()))
                  .map(v -> v.getVariable().toString()).collect(Collectors.joining(","));
          return Response.ok(result).build();
      }
  
      @Path("/results/{from}")
      @POST
      @Produces(MediaType.TEXT_PLAIN)
      public Response results(@PathParam("from") String from, String oid) throws Exception {
          String result = snmpResults.get(from).stream().map(m -> m.getSnmpMessage().getVariable(new OID(oid)).toString())
                  .collect(Collectors.joining(","));
  
          return Response.ok(result).build();
      }
  
      public PDU createTrap(String payload, int version) {
          OID oid = new OID("1.2.3.4.5");
          Variable var = new OctetString(payload);
          PDU pdu;
          switch (version) {
          case 0:
              PDUv1 trap0 = new PDUv1();
              trap0.setGenericTrap(PDUv1.ENTERPRISE_SPECIFIC);
              trap0.setSpecificTrap(1);
              trap0.setEnterprise(oid);
  
              pdu = trap0;
              break;
          case 1:
              pdu = new PDU();
              break;
          default:
              pdu = new ScopedPDU();
              break;
          }
  
          pdu.add(new VariableBinding(SnmpConstants.snmpTrapOID, new OctetString(payload)));
          pdu.add(new VariableBinding(SnmpConstants.sysUpTime, new TimeTicks(5000))); // put your uptime here
          pdu.add(new VariableBinding(SnmpConstants.sysDescr, new OctetString("System Description")));
  
          pdu.add(new VariableBinding(oid, var));
          return pdu;
      }
  }
  