/// <summary>
/// Subscribes an existing Amazon SQS queue to existing Amazon SNS topics.
/// <para>
/// The policy applied to the SQS queue is similar to this:
/// <code>
/// {
/// "Version" : "2008-10-17",
/// "Statement" : [{
/// "Sid" : "topic-subscription-arn:aws:sns:us-west-2:599109622955:myTopic",
/// "Effect" : "Allow",
/// "Principal" : "*",
/// "Action" : ["sqs:SendMessage"],
/// "Resource":["arn:aws:sqs:us-west-2:599109622955:myQueue"],
/// "Condition" : {
/// "ArnLike":{
/// "aws:SourceArn":["arn:aws:sns:us-west-2:599109622955:myTopic"]
/// }
/// }
/// }]
/// }
/// </code>
/// </para>
/// <para>
/// There might be a small time period immediately after
/// subscribing the SQS queue to the SNS topic and updating the SQS queue's
/// policy, where messages are not able to be delivered to the queue. After a
/// moment, the new queue policy will propagate and the queue will be able to
/// receive messages. This delay only occurs immediately after initially
/// subscribing the queue.
/// </para>
/// </summary>
/// <param name="topicArns">The topics to subscribe to</param>
/// <param name="sqsClient">The SQS client used to get attributes and set the policy on the SQS queue.</param>
/// <param name="sqsQueueUrl">The queue to add a subscription to.</param>
/// <returns>The mapping of topic ARNs to subscription ARNs as returned by Amazon SNS when the queue is
/// successfully subscribed to each topic.</returns>
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);
}
/// <summary>
/// Subscribes an existing Amazon SQS queue to existing Amazon SNS topics.
/// <para>
/// The policy applied to the SQS queue is similar to this:
/// <code>
/// {
/// "Version" : "2008-10-17",
/// "Statement" : [{
/// "Sid" : "topic-subscription-arn:aws:sns:us-west-2:599109622955:myTopic",
/// "Effect" : "Allow",
/// "Principal" : "*",
/// "Action" : ["sqs:SendMessage"],
/// "Resource":["arn:aws:sqs:us-west-2:599109622955:myQueue"],
/// "Condition" : {
/// "ArnLike":{
/// "aws:SourceArn":["arn:aws:sns:us-west-2:599109622955:myTopic"]
/// }
/// }
/// }]
/// }
/// </code>
/// </para>
/// <para>
/// There might be a small time period immediately after
/// subscribing the SQS queue to the SNS topic and updating the SQS queue's
/// policy, where messages are not able to be delivered to the queue. After a
/// moment, the new queue policy will propagate and the queue will be able to
/// receive messages. This delay only occurs immediately after initially
/// subscribing the queue.
/// </para>
/// </summary>
/// <param name="topicArns">The topics to subscribe to</param>
/// <param name="sqsClient">The SQS client used to get attributes and set the policy on the SQS queue.</param>
/// <param name="sqsQueueUrl">The queue to add a subscription to.</param>
/// <returns>The mapping of topic ARNs to subscription ARNs as returned by Amazon SNS when the queue is
/// successfully subscribed to each topic.</returns>
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;
}
