GCSBucketPolicyChecker

	String bucketName = "company-block-log-fce65e82-a0cd-4f71-8693-381100d93c18";
		Policy p = Cache.GCSStorage.getIamPolicy(bucketName);
		System.out.println(p);

		List<Role> roleList = new ArrayList<>();
		List<Set<Identity>> identities = new ArrayList<>();
		// Print Roles and its identities
		Set<Identity> wrongIdentities = new HashSet<Identity>();
		Role roler = null;
		Map<Role, Set<Identity>> policyBindings = p.getBindings();
		Set<Identity> setidentities = new HashSet<>();
		for (Map.Entry<Role, Set<Identity>> entry : policyBindings.entrySet()) {
			roler = entry.getKey();
			System.out.println("roler plain " + roler);
			System.out.println("roler other  " + roler.getValue());

			if (roler.getValue().equals("roles/storage.objectAdmin")) {
				System.out.println("roler :" + roler.getValue());
				System.out.println("Identities getV :" + entry.getValue());
				System.out.println("Identities getK :" + entry.getKey());

				setidentities = entry.getValue();
				System.out.println("setidentities  :" + setidentities);
				System.out.println("setidentities size :" + setidentities.size());
				for (Identity set : setidentities) {
					if ((set.equals("serviceAccount:attacker@csbauditor.iam.gserviceaccount.com"))) {
						System.out.println("strong one : " + set);
						continue;
					} else {
						wrongIdentities.add(set);
						System.out.println("strong one : " + set);

					}

					System.out.println("wrongIdentities.size() : " + wrongIdentities.size());

				}
			}

		}
		
		System.out.println("ww " + wrongIdentities);
		System.out.println("policyEtag " + p.getEtag());
		GCSFunctions function = new GCSFunctions();
		for (Identity identity : wrongIdentities) {

			removeUserFromBucketUsingEmail(bucketName, roler, identity.getValue());
		}

	}
  
  
  public static void removeUserFromBucketUsingEmail(String bucketName, Role role, String email) throws IOException {

		Storage storage = GoogleStorage.initStorage();
		Policy policy = storage.getIamPolicy(bucketName);
		String eTag = policy.getEtag();
		System.out.println("etag: " + eTag);

		Policy updatedPolicy = Cache.GCSStorage.setIamPolicy(bucketName, policy.toBuilder()
				.removeIdentity(role, Identity.serviceAccount(email)).build());

	}