public SNSHelper(AwsClientDetails clientDetails, String serviceUrl = null)
 {
     if (string.IsNullOrEmpty(serviceUrl))
     {
         Client = AWSClientFactory.CreateAmazonSNSClient(clientDetails.AwsAccessKeyId,
                                                         clientDetails.AwsSecretAccessKey);
     }
     else
     {
         AmazonSimpleNotificationServiceConfig asnsConfig = new AmazonSimpleNotificationServiceConfig();
         asnsConfig.ServiceURL = serviceUrl;
         Client = AWSClientFactory.CreateAmazonSNSClient(clientDetails.AwsAccessKeyId,
                                                         clientDetails.AwsSecretAccessKey, asnsConfig);
     }
 }

        public ISubscribeReponseMessage Subscribe(string queueUrl)
        {
            var sqsConfig = new AmazonSQSConfig {ServiceURL = SqsServiceUrl};
            var snsConfig = new AmazonSimpleNotificationServiceConfig {ServiceURL = SnsServiceUrl};

            using (var sqsClient = _awsConfig.CreateAwsClient<AmazonSQSClient>(sqsConfig))
            {
                var attributesRequest = new GetQueueAttributesRequest(queueUrl, new List<string> {"QueueArn"});

                var attributesResponse = sqsClient.GetQueueAttributes(attributesRequest);

                using (var snsClient = _awsConfig.CreateAwsClient<AmazonSimpleNotificationServiceClient>(snsConfig))
                {
                    var subribeResonse =
                        snsClient.Subscribe(new SubscribeRequest(TopicArn, "sqs", attributesResponse.QueueARN));
                }

                var actions = new ActionIdentifier[2];
                actions[0] = SQSActionIdentifiers.SendMessage;
                actions[1] = SQSActionIdentifiers.ReceiveMessage;
                var sqsPolicy =
                    new Policy().WithStatements(
                        new Statement(Statement.StatementEffect.Allow).WithPrincipals(Principal.AllUsers)
                            .WithResources(
                                new Resource(attributesResponse.QueueARN))
                            .WithConditions(
                                ConditionFactory.NewSourceArnCondition(
                                    TopicArn))
                            .WithActionIdentifiers(actions));
                var setQueueAttributesRequest = new SetQueueAttributesRequest();

                var attributes = new Dictionary<string, string> {{"Policy", sqsPolicy.ToJson()}};
                var attRequest = new SetQueueAttributesRequest(attributesRequest.QueueUrl, attributes);

                sqsClient.SetQueueAttributes(attRequest);

                return new SubcriptionMessage("Ok");
            }
        }

 /// <summary>
 /// Create a client for the Amazon SimpleNotificationService Service with AWSCredentials and an AmazonSimpleNotificationService Configuration object.
 /// </summary>
 /// <param name="credentials">AWS Credentials</param>
 /// <param name="config">Configuration options for the service like HTTP Proxy, # of connections, etc</param>
 /// <returns>An Amazon SimpleNotificationService client</returns>
 /// <remarks>
 /// </remarks>
 public static IAmazonSimpleNotificationService CreateAmazonSimpleNotificationServiceClient(AWSCredentials credentials, AmazonSimpleNotificationServiceConfig config)
 {
     return new AmazonSimpleNotificationServiceClient(credentials, config);
 }

 /// <summary>
 /// Create a client for the Amazon SNS Service with the credentials loaded from the application's
 /// default configuration, and if unsuccessful from the Instance Profile service on an EC2 instance.
 /// 
 /// Example App.config with credentials set. 
 /// <code>
 /// &lt;?xml version="1.0" encoding="utf-8" ?&gt;
 /// &lt;configuration&gt;
 ///     &lt;appSettings&gt;
 ///         &lt;add key="AWSAccessKey" value="********************"/&gt;
 ///         &lt;add key="AWSSecretKey" value="****************************************"/&gt;
 ///     &lt;/appSettings&gt;
 /// &lt;/configuration&gt;
 /// </code>
 /// </summary>
 /// <param name="config">Configuration options for the service like HTTP Proxy, # of connections, etc</param>
 /// <returns>An Amazon SNS client</returns>
 public static AmazonSimpleNotificationService CreateAmazonSNSClient(AmazonSimpleNotificationServiceConfig config)
 {
     return new AmazonSimpleNotificationServiceClient(config);
 }

 /// <summary>
 /// Constructs AmazonSimpleNotificationServiceClient with AWS Access Key ID, AWS Secret Key and an
 /// AmazonSimpleNotificationServiceClient Configuration object. If the config object's
 /// UseSecureStringForAwsSecretKey is false, the AWS Secret Key
 /// is stored as a clear-text string. Please use this option only
 /// if the application environment doesn't allow the use of SecureStrings.
 /// </summary>
 /// <param name="awsAccessKeyId">AWS Access Key ID</param>
 /// <param name="awsSecretAccessKey">AWS Secret Access Key</param>
 /// <param name="awsSessionToken">AWS Session Token</param>
 /// <param name="clientConfig">The AmazonSimpleNotificationServiceClient Configuration Object</param>
 public AmazonSimpleNotificationServiceClient(string awsAccessKeyId, string awsSecretAccessKey, string awsSessionToken, AmazonSimpleNotificationServiceConfig clientConfig)
     : base(awsAccessKeyId, awsSecretAccessKey, awsSessionToken, clientConfig, AuthenticationTypes.User | AuthenticationTypes.Session)
 {
 }

 /// <summary>
 /// Constructs AmazonSimpleNotificationServiceClient with AWS Access Key ID, AWS Secret Key and an
 /// AmazonSimpleNotificationServiceClient Configuration object. 
 /// </summary>
 /// <param name="awsAccessKeyId">AWS Access Key ID</param>
 /// <param name="awsSecretAccessKey">AWS Secret Access Key</param>
 /// <param name="clientConfig">The AmazonSimpleNotificationServiceClient Configuration Object</param>
 public AmazonSimpleNotificationServiceClient(string awsAccessKeyId, string awsSecretAccessKey, AmazonSimpleNotificationServiceConfig clientConfig)
     : base(awsAccessKeyId, awsSecretAccessKey, clientConfig)
 {
 }

        private OperationResult EstablishClient(AddonManifest manifest, DeveloperOptions devOptions, out AmazonSimpleNotificationServiceClient client)
        {
            OperationResult result;

            bool requireCreds;
            var manifestprops = manifest.GetProperties().ToDictionary(x => x.Key, x => x.Value);
            var AccessKey = manifestprops["AWSClientKey"];
            var SecretAccessKey = manifestprops["AWSSecretKey"];
            var _RegionEndpoint = manifestprops["AWSRegionEndpoint"];

            var prop =
                manifest.Properties.First(
                    p => p.Key.Equals("requireDevCredentials", StringComparison.InvariantCultureIgnoreCase));

            if (bool.TryParse(prop.Value, out requireCreds) && requireCreds)
            {
                if (!ValidateDevCreds(devOptions))
                {
                    client = null;
                    result = new OperationResult()
                    {
                        IsSuccess = false,
                        EndUserMessage =
                            "The add on requires that developer credentials are specified but none were provided."
                    };
                    return result;
                }

                //accessKey = devOptions.AccessKey;
                //secretAccessKey = devOptions.SecretAccessKey;
            }
            AmazonSimpleNotificationServiceConfig config = new AmazonSimpleNotificationServiceConfig() { RegionEndpoint = RegionEndpoint.USEast1 };
            client = new AmazonSimpleNotificationServiceClient(AccessKey, SecretAccessKey, config);
            result = new OperationResult { IsSuccess = true };
            return result;
        }

        /// <summary>
        /// Notification configuration window load event
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void NcWindow_Loaded(object sender, RoutedEventArgs e)
        {
            try
            {
                AmazonAutoScalingConfig config = new AmazonAutoScalingConfig();
                config.ServiceURL = ((ViewModel)this.DataContext).Region.Url;
                AmazonAutoScalingClient client = new AmazonAutoScalingClient(config);
                DescribeAutoScalingNotificationTypesRequest dasntreq = new DescribeAutoScalingNotificationTypesRequest();
                DescribeAutoScalingNotificationTypesResponse dasntresp = client.DescribeAutoScalingNotificationTypes(dasntreq);
                foreach (string asnt in dasntresp.DescribeAutoScalingNotificationTypesResult.AutoScalingNotificationTypes)
                {
                    this.notificationTypes.Add(asnt);
                }

                AmazonSimpleNotificationServiceConfig snsconfig = new AmazonSimpleNotificationServiceConfig();
                config.ServiceURL = ((ViewModel)this.DataContext).Region.Url;
                AmazonSimpleNotificationServiceClient snsclient = new AmazonSimpleNotificationServiceClient(snsconfig);
                ListTopicsRequest ltrequest = new ListTopicsRequest();
                ListTopicsResponse ltresp = snsclient.ListTopics(ltrequest);
                foreach (Topic topic in ltresp.ListTopicsResult.Topics)
                {
                    this.snstopics.Add(topic.TopicArn);
                }

                rlbNcTypes.ItemsSource = this.notificationTypes;
                cboTopics.ItemsSource = this.snstopics;
            }
            catch
            {
                MessageBox.Show(Window.GetWindow(this), "Error occured while loading the notification configuration options.", "Error", MessageBoxButton.OK);
                this.Close();
            }
        }