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

        public async Task<IDictionary<string, string>> SubscribeQueueToTopicsAsync(IList<string> topicArns, ICoreAmazonSQS sqsClient, string sqsQueueUrl)
        {
            // Get the queue's existing policy and ARN
            var queueAttributes = await sqsClient.GetAttributesAsync(sqsQueueUrl).ConfigureAwait(false);

            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);

                SubscribeResponse response = await this.SubscribeAsync(new SubscribeRequest
                {
                    TopicArn = topicArn,
                    Protocol = "sqs",
                    Endpoint = sqsQueueArn,
                }).ConfigureAwait(false);
                subscriptionArns.Add(topicArn, response.SubscriptionArn);
            }

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

            return subscriptionArns;
        }