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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2013-2016 Amazon Technologies, Inc.
 *
 * 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://aws.amazon.com/apache2.0
 *
 * This file 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 com.amazonaws.services.ec2.util;

import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.services.ec2.AmazonEC2;
import com.amazonaws.services.ec2.model.DescribeSecurityGroupsRequest;

public class SecurityGroupUtils {

    private static final String INVALID_GROUP_NOT_FOUND = "InvalidGroup.NotFound";

    /**
     * Provides a quick answer to whether a security group exists.
     *
     * @param ec2
     *            the EC2 client to use for making service requests
     * @param securityGroupName
     *            the name of the security group being queried
     * @throws AmazonClientException
     *             If any internal errors are encountered inside the client
     *             while attempting to make the request or handle the response.
     *             For example if a network connection is not available.
     * @throws AmazonServiceException
     *             If an error response is returned by AmazonEC2 indicating
     *             either a problem with the data in the request, or a server
     *             side issue.
     */
    public static boolean doesSecurityGroupExist(AmazonEC2 ec2,
            String securityGroupName) throws AmazonClientException,
            AmazonServiceException {

        DescribeSecurityGroupsRequest securityGroupsRequest =
                new DescribeSecurityGroupsRequest()
                    .withGroupNames(securityGroupName);

        try {
            ec2.describeSecurityGroups(securityGroupsRequest);
            return true;

        } catch (AmazonServiceException ase) {
            if (INVALID_GROUP_NOT_FOUND.equals(ase.getErrorCode())) {
                return false;
            }
            throw ase;
        }
    }
}