protected ModelAndView doHandle()

in amazon-sns-trigger-server/src/main/java/jetbrains/buildServer/clouds/amazon/sns/trigger/controllers/AwsSnsHttpEndpointController.java [58:119]
47 lines of code
14 McCabe index (conditional complexity)

  protected ModelAndView doHandle(@NotNull HttpServletRequest request, @NotNull HttpServletResponse response) throws Exception {
    final ActionErrors errors = new ActionErrors();

    try {
      final String fullPath = request.getServletPath() + request.getPathInfo();
      Matcher m = pathPattern.matcher(fullPath);
      if (!m.find()) {
        throw new AwsSnsHttpEndpointException("Invalid or Unsupported URL is given: " + fullPath);
      }

      String projectId = m.group(1);
      String buildTypeId = m.group(2);
      String triggerUuid = m.group(3);

      if (projectId == null || projectId.trim().isEmpty()) {
        throw new AwsSnsHttpEndpointException("No ProjectId given in the path");
      }

      if (buildTypeId == null || buildTypeId.trim().isEmpty()) {
        throw new AwsSnsHttpEndpointException("No BuildTypeId given in the path");
      }

      if (triggerUuid == null || triggerUuid.trim().isEmpty()) {
        throw new AwsSnsHttpEndpointException("No Trigger UUID given in the path");
      }

      String finalProjectId = projectId.trim();
      final String finalBuildTypeId = buildTypeId.trim();

      SProject project = mySecurityContext.runAsSystemUnchecked(() -> myProjectManager.findProjectByExternalId(finalProjectId));
      if (project == null) {
        throw new AwsSnsHttpEndpointException("Couldn't find the project with id: " + finalProjectId);
      }

      SBuildType buildType = mySecurityContext.runAsSystemUnchecked(() -> project.findBuildTypeByExternalId(finalBuildTypeId));
      if (buildType == null) {
        throw new AwsSnsHttpEndpointException("Couldn't find build type with id: " + finalBuildTypeId);
      }

      final String finalTriggerUuid = triggerUuid.trim();
      BuildTriggerDescriptor buildTrigger = buildType.getBuildTriggersCollection().stream()
              .filter(btd -> btd.getType().equals(TRIGGER_NAME) &&
                      btd.getProperties().get(AwsSnsTriggerConstants.TRIGGER_UUID_PROPERTY_KEY) != null &&
                      btd.getProperties().get(AwsSnsTriggerConstants.TRIGGER_UUID_PROPERTY_KEY).equals(finalTriggerUuid))
              .findFirst()
              .orElseThrow(() -> new AwsSnsHttpEndpointException("There are no suitable trigger in the build: " + finalBuildTypeId));

      // OK! we've defined project and the buildType with necessary buildTrigger
      // lets get into request details and find out what kind of request is it?
      if (isPost(request)) {
        doPost(request, buildType, buildTrigger);
      }
      // otherwise just ignore this message
    } catch (Exception error) {
      LOG.warnAndDebugDetails("Error while processing SNS Endpoint request", error);
      errors.addError("error_snsEndpointResolve", error.getMessage());
      writeErrorsAsJson(errors, response);
    }

    // this will return HTTP_CODE 200
    return null;
  }