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# Amazon SQS, Amazon SNS and Tools for Windows PowerShell
<a name="pstools-sqs-queue-sns-topic"></a>

This section provides examples that show how to:
+ Create an Amazon SQS queue and get queue ARN (Amazon Resource Name).
+ Create an Amazon SNS topic.
+ Give permissions to the SNS topic so that it can send messages to the queue.
+ Subscribe the queue to the SNS topic
+ Give IAM users or AWS accounts permissions to publish to the SNS topic and read messages from the SQS queue.
+ Verify results by publishing a message to the topic and reading the message from the queue.

## Create an Amazon SQS queue and get queue ARN
<a name="pstools-create-sqs-queue"></a>

The following command creates an SQS queue in your default region. The output shows the URL of the new queue.

```
PS > New-SQSQueue -QueueName myQueue
https://sqs.us-west-2.amazonaws.com/123456789012/myQueue
```

The following command retrieves the ARN of the queue.

```
PS > Get-SQSQueueAttribute -QueueUrl https://sqs.us-west-2.amazonaws.com/123456789012/myQueue -AttributeName QueueArn
...
QueueARN               : arn:aws:sqs:us-west-2:123456789012:myQueue
...
```

## Create an Amazon SNS topic
<a name="pstools-create-sns-topic"></a>

The following command creates an SNS topic in your default region, and returns the ARN of the new topic.

```
PS > New-SNSTopic -Name myTopic
arn:aws:sns:us-west-2:123456789012:myTopic
```

## Give permissions to the SNS topic
<a name="pstools-permissions-sns-topic"></a>

The following example script creates both an SQS queue and an SNS topic, and grants permissions to the SNS topic so that it can send messages to the SQS queue:

```
# create the queue and topic to be associated
$qurl = New-SQSQueue -QueueName "myQueue"
$topicarn = New-SNSTopic -Name "myTopic"

# get the queue ARN to inject into the policy; it will be returned
# in the output's QueueARN member but we need to put it into a variable
# so text expansion in the policy string takes effect
$qarn = (Get-SQSQueueAttribute -QueueUrl $qurl -AttributeNames "QueueArn").QueueARN

# construct the policy and inject arns
$policy = @"
{
    "Version": "2012-10-17",		 	 	 
    "Statement": {
        "Effect": "Allow",
        "Principal": "*",
        "Action": "SQS:SendMessage",
        "Resource": "$qarn",
        "Condition": { "ArnEquals": { "aws:SourceArn": "$topicarn" } }
    }
}
"@

# set the policy
Set-SQSQueueAttribute -QueueUrl $qurl -Attribute @{ Policy=$policy }
```

## Subscribe the queue to the SNS topic
<a name="pstools-subscribe-queue-topic"></a>

The following command subscribes the queue `myQueue` to the SNS topic `myTopic`, and returns the Subscription ID:

```
PS > Connect-SNSNotification `
    -TopicARN arn:aws:sns:us-west-2:123456789012:myTopic `
    -Protocol SQS `
    -Endpoint arn:aws:sqs:us-west-2:123456789012:myQueue
arn:aws:sns:us-west-2:123456789012:myTopic:f8ff77c6-e719-4d70-8e5c-a54d41feb754
```

## Give permissions
<a name="pstools-permissions-publish-read"></a>

The following command grants permission to perform the `sns:Publish` action on the topic `myTopic`

```
PS > Add-SNSPermission `
    -TopicArn arn:aws:sns:us-west-2:123456789012:myTopic `
    -Label ps-cmdlet-topic `
    -AWSAccountIds 123456789012 `
    -ActionNames publish
```

The following command grants permission to perform the `sqs:ReceiveMessage` and `sqs:DeleteMessage` actions on the queue `myQueue`.

```
PS > Add-SQSPermission `
    -QueueUrl https://sqs.us-west-2.amazonaws.com/123456789012/myQueue `
    -AWSAccountId "123456789012" `
    -Label queue-permission `
    -ActionName SendMessage, ReceiveMessage
```

## Verify results
<a name="pstools-verify-publish-read"></a>

The following command tests your new queue and topic by publishing a message to the SNS topic `myTopic` and returns the `MessageId`.

```
PS > Publish-SNSMessage `
    -TopicArn arn:aws:sns:us-west-2:123456789012:myTopic `
    -Message "Have A Nice Day!"
728180b6-f62b-49d5-b4d3-3824bb2e77f4
```

The following command retrieves the message from the SQS queue `myQueue` and displays it.

```
PS > Receive-SQSMessage -QueueUrl https://sqs.us-west-2.amazonaws.com/123456789012/myQueue

Attributes             : {}
Body                   : {
                           "Type" : "Notification",
                           "MessageId" : "491c687d-b78d-5c48-b7a0-3d8d769ee91b",
                           "TopicArn" : "arn:aws:sns:us-west-2:123456789012:myTopic",
                           "Message" : "Have A Nice Day!",
                           "Timestamp" : "2019-09-09T21:06:27.201Z",
                           "SignatureVersion" : "1",
                           "Signature" : "llE17A2+XOuJZnw3TlgcXz4C4KPLXZxbxoEMIirelhl3u/oxkWmz5+9tJKFMns1ZOqQvKxk+ExfEZcD5yWt6biVuBb8pyRmZ1bO3hUENl3ayv2WQiQT1vpLpM7VEQN5m+hLIiPFcs
                         vyuGkJReV7lOJWPHnCN+qTE2lId2RPkFOeGtLGawTsSPTWEvJdDbLlf7E0zZ0q1niXTUtpsZ8Swx01X3QO6u9i9qBFt0ekJFZNJp6Avu05hIklb4yoRs1IkbLVNBK/y0a8Yl9lWp7a7EoWaBn0zhCESe7o
                         kZC6ncBJWphX7KCGVYD0qhVf/5VDgBuv9w8T+higJyvr3WbaSvg==",
                           "SigningCertURL" : "https://sns.us-west-2.amazonaws.com/SimpleNotificationService-6aad65c2f9911b05cd53efda11f913f9.pem",
                           "UnsubscribeURL" : 
                         "https://sns.us-west-2.amazonaws.com/?Action=Unsubscribe&SubscriptionArn=arn:aws:sns:us-west-2:123456789012:myTopic:22b77de7-a216-4000-9a23-bf465744ca84"
                         }
MD5OfBody              : 5b5ee4f073e9c618eda3718b594fa257
MD5OfMessageAttributes : 
MessageAttributes      : {}
MessageId              : 728180b6-f62b-49d5-b4d3-3824bb2e77f4
ReceiptHandle          : AQEB2vvk1e5cOKFjeIWJticabkc664yuDEjhucnIOqdVUmie7bX7GiJbl7F0enABUgaI2XjEcNPxixhVc/wfsAJZLNHnl8SlbQa0R/kD+Saqa4OIvfj8x3M4Oh1yM1cVKpYmhAzsYrAwAD5g5FvxNBD6zs
                         +HmXdkax2Wd+9AxrHlQZV5ur1MoByKWWbDbsqoYJTJquCclOgWIak/sBx/daBRMTiVQ4GHsrQWMVHtNC14q7Jy/0L2dkmb4dzJfJq0VbFSX1G+u/lrSLpgae+Dfux646y8yFiPFzY4ua4mCF/SVUn63Spy
                         sHN12776axknhg3j9K/Xwj54DixdsegnrKoLx+ctI+0jzAetBR66Q1VhIoJAq7s0a2MseyOeM/Jjucg6Sr9VUnTWVhV8ErXmotoiEg==
```