How to use

getPrincipal

method

in

co.cask.cdap.security.impersonation.ImpersonationInfo

 public Map<String, String> getSystemProperties(Id.Program id) throws IOException, NamespaceNotFoundException {
  Map<String, String> systemArgs = Maps.newHashMap();
  systemArgs.put(Constants.CLUSTER_NAME, cConf.get(Constants.CLUSTER_NAME, ""));
  systemArgs.put(Constants.AppFabric.APP_SCHEDULER_QUEUE, queueResolver.getQueue(id.getNamespace()));
  if (SecurityUtil.isKerberosEnabled(cConf)) {
   ImpersonationInfo impersonationInfo = SecurityUtil.createImpersonationInfo(ownerAdmin, cConf, id.toEntityId());
   systemArgs.put(ProgramOptionConstants.PRINCIPAL, impersonationInfo.getPrincipal());
   systemArgs.put(ProgramOptionConstants.APP_PRINCIPAL_EXISTS,
           String.valueOf(ownerAdmin.exists(id.toEntityId().getParent())));
  }
  return systemArgs;
 }
}

 public Map<String, String> getSystemProperties(Id.Program id) throws IOException, NamespaceNotFoundException {
  Map<String, String> systemArgs = Maps.newHashMap();
  systemArgs.put(Constants.CLUSTER_NAME, cConf.get(Constants.CLUSTER_NAME, ""));
  systemArgs.put(Constants.AppFabric.APP_SCHEDULER_QUEUE, queueResolver.getQueue(id.getNamespace()));
  if (SecurityUtil.isKerberosEnabled(cConf)) {
   ImpersonationInfo impersonationInfo = SecurityUtil.createImpersonationInfo(ownerAdmin, cConf, id.toEntityId());
   systemArgs.put(ProgramOptionConstants.PRINCIPAL, impersonationInfo.getPrincipal());
   systemArgs.put(ProgramOptionConstants.APP_PRINCIPAL_EXISTS,
           String.valueOf(ownerAdmin.exists(id.toEntityId().getParent())));
  }
  return systemArgs;
 }
}

@Override
public final UGIWithPrincipal getConfiguredUGI(ImpersonationRequest impersonationRequest) throws IOException {
 try {
  UGIWithPrincipal ugi = impersonationRequest.getImpersonatedOpType().equals(ImpersonatedOpType.EXPLORE) ||
   impersonationRequest.getPrincipal() == null ?
   null : ugiCache.getIfPresent(new UGICacheKey(impersonationRequest));
  if (ugi != null) {
   return ugi;
  }
  boolean isCache = checkExploreAndDetermineCache(impersonationRequest);
  ImpersonationInfo info = getPrincipalForEntity(impersonationRequest);
  ImpersonationRequest newRequest = new ImpersonationRequest(impersonationRequest.getEntityId(),
                                impersonationRequest.getImpersonatedOpType(),
                                info.getPrincipal(), info.getKeytabURI());
  return isCache ? ugiCache.get(new UGICacheKey(newRequest)) : createUGI(newRequest);
 } catch (ExecutionException e) {
  Throwable cause = e.getCause();
  // Propagate if the cause is an IOException or RuntimeException
  Throwables.propagateIfPossible(cause, IOException.class);
  // Otherwise always wrap it with IOException
  throw new IOException(cause);
 }
}