code: /*******************************************************************************
   * Copyright 2018 572682
   * 
   * Licensed 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 us.dot.its.jpo.ode.traveler;
  
  import java.io.IOException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.snmp4j.PDU;
  import org.snmp4j.ScopedPDU;
  import org.snmp4j.event.ResponseEvent;
  import org.snmp4j.smi.Integer32;
  import org.snmp4j.smi.OID;
  import org.snmp4j.smi.VariableBinding;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.http.HttpStatus;
  import org.springframework.http.ResponseEntity;
  import org.springframework.web.bind.annotation.CrossOrigin;
  import org.springframework.web.bind.annotation.DeleteMapping;
  import org.springframework.web.bind.annotation.RequestBody;
  import org.springframework.web.bind.annotation.RequestParam;
  import org.springframework.web.bind.annotation.RestController;
  
  import us.dot.its.jpo.ode.OdeProperties;
  import us.dot.its.jpo.ode.plugin.RoadSideUnit.RSU;
  import us.dot.its.jpo.ode.snmp.SnmpSession;
  import us.dot.its.jpo.ode.util.JsonUtils;
  
  @RestController
  public class TimDeleteController {
  
     private static final Logger logger = LoggerFactory.getLogger(TimDeleteController.class);
  
     private static final String ERRSTR = "error";
  
     private OdeProperties odeProperties;
     
     @Autowired
     public TimDeleteController(OdeProperties odeProperties) {
        super();
        this.odeProperties = odeProperties;
     }
  
     @CrossOrigin
     @DeleteMapping(value = "/tim")
     public ResponseEntity<String> deleteTim(@RequestBody String jsonString,
           @RequestParam(value = "index", required = true) Integer index) { // NOSONAR
  
        if (null == jsonString) {
          logger.error("Empty request");
          return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(JsonUtils.jsonKeyValue(ERRSTR, "Empty request"));
        }
  
        RSU queryTarget = (RSU) JsonUtils.fromJson(jsonString, RSU.class);
        TimTransmogrifier.updateRsuCreds(queryTarget, odeProperties);
  
        logger.info("TIM delete call, RSU info {}", queryTarget);
  
        SnmpSession ss = null;
        try {
           ss = new SnmpSession(queryTarget);
        } catch (IOException e) {
           logger.error("Error creating TIM delete SNMP session", e);
           return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
                 .body(JsonUtils.jsonKeyValue(ERRSTR, e.getMessage()));
        } catch (NullPointerException e) {
           logger.error("TIM query error, malformed JSON", e);
           return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(JsonUtils.jsonKeyValue(ERRSTR, "Malformed JSON"));
        }
  
        PDU pdu = new ScopedPDU();
        pdu.add(new VariableBinding(new OID("1.0.15628.4.1.4.1.11.".concat(Integer.toString(index))), new Integer32(6)));
        pdu.setType(PDU.SET);
  
        ResponseEvent rsuResponse = null;
        try {
           rsuResponse = ss.set(pdu, ss.getSnmp(), ss.getTarget(), false);
        } catch (IOException e) {
           logger.error("Error sending TIM query PDU to RSU", e);
           return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
                 .body(JsonUtils.jsonKeyValue(ERRSTR, e.getMessage()));
        }
  
        // Try to explain common errors
        HttpStatus returnCode = null;
        String bodyMsg = "";
        if (null == rsuResponse || null == rsuResponse.getResponse()) {
           // Timeout
           returnCode = HttpStatus.REQUEST_TIMEOUT;
           bodyMsg = JsonUtils.jsonKeyValue(ERRSTR, "Timeout.");
        } else if (rsuResponse.getResponse().getErrorStatus() == 0) {
           // Success
           returnCode = HttpStatus.OK;
           bodyMsg = JsonUtils.jsonKeyValue("deleted_msg", Integer.toString(index));
        } else if (rsuResponse.getResponse().getErrorStatus() == 12) {
           // Message previously deleted or doesn't exist
           returnCode = HttpStatus.BAD_REQUEST;
           bodyMsg = JsonUtils.jsonKeyValue(ERRSTR, "No message at index ".concat(Integer.toString(index)));
        } else if (rsuResponse.getResponse().getErrorStatus() == 10) {
           // Invalid index
           returnCode = HttpStatus.BAD_REQUEST;
           bodyMsg = JsonUtils.jsonKeyValue(ERRSTR, "Invalid index ".concat(Integer.toString(index)));
        } else {
           // Misc error
           returnCode = HttpStatus.BAD_REQUEST;
           bodyMsg = JsonUtils.jsonKeyValue(ERRSTR, rsuResponse.getResponse().getErrorStatusText());
        }
  
        logger.info("Delete call response code: {}, message: {}", returnCode, bodyMsg);
  
        return ResponseEntity.status(returnCode).body(bodyMsg);
     }
  
  }
  