Amazon.SimpleNotificationService.AmazonSimpleNotificationServiceClient.SubscribeQueueToTopics C# (CSharp) Метод

        public IDictionary<string, string> SubscribeQueueToTopics(IList<string> topicArns, ICoreAmazonSQS sqsClient, string sqsQueueUrl)
        {
            // Get the queue's existing policy and ARN
            var queueAttributes = sqsClient.GetAttributes(sqsQueueUrl);

            string sqsQueueArn = queueAttributes["QueueArn"];

            Policy policy;
            string policyStr = null;
            if(queueAttributes.ContainsKey("Policy"))
                policyStr = queueAttributes["Policy"];
            if (string.IsNullOrEmpty(policyStr))
                policy = new Policy();
            else
                policy = Policy.FromJson(policyStr);

            var subscriptionArns = new Dictionary<string,string>();

            foreach (var topicArn in topicArns)
            {
                if (!HasSQSPermission(policy, topicArn, sqsQueueArn))
                    AddSQSPermission(policy, topicArn, sqsQueueArn);

                var arn = this.Subscribe(new SubscribeRequest
                {
                    TopicArn = topicArn,
                    Protocol = "sqs",
                    Endpoint = sqsQueueArn
                }).SubscriptionArn;

                subscriptionArns.Add(topicArn, arn);
            }

            var setAttributes = new Dictionary<string, string> { { "Policy", policy.ToJson() } };
            sqsClient.SetAttributes(sqsQueueUrl, setAttributes);

            return subscriptionArns;
        }