{
    "AWSTemplateFormatVersion": "2010-09-09",

    "Description": "Creates the SNS topic, SQS queue and instance that will service the custom resources queue",

    "Outputs": {
        "Queue": {
            "Description": "The queue to where we will poll messages",
            "Value": {
                "Fn::GetAtt": ["CustomResourcesQueue", "QueueName"]
            }
        },
        "Topic" : {
            "Description": "The topic that will be taking messages",
            "Value": {
                "Ref": "CustomResourcesTopic"
            }
        }
    },

    "Resources": {
        "CustomResourcesQueue": {
            "Type": "AWS::SQS::Queue",
            "Properties": {
                "ReceiveMessageWaitTimeSeconds": 20,
                "VisibilityTimeout": 60
            }
        },
        "CustomResourcesTopic": {
            "Type": "AWS::SNS::Topic",
            "Properties": {
                "Subscription": [
                    {
                        "Endpoint": {
                            "Fn::GetAtt": ["CustomResourcesQueue", "Arn"]
                        },
                        "Protocol": "sqs"
                    }
                ]
            }
        },
        "SNSToSQSPolicy": {
            "Type": "AWS::SQS::QueuePolicy",
            "Properties": {
                "PolicyDocument": {
                    "Id": "PushMessageToSQSPolicy",
                    "Version": "2012-10-17",
                    "Statement": [
                        {
                            "Sid": "allow-sns-to-send-message-to-sqs",
                            "Effect": "Allow",
                            "Action": ["sqs:SendMessage"],
                            "Principal": {
                                "AWS": "*"
                            },
                            "Resource": "*",
                            "Condition": {
                                "ArnEquals": {
                                    "aws:SourceArn": {
                                        "Ref": "CustomResourcesTopic"
                                    }
                                }
                            }
                        }
                    ]
                },
                "Queues": [
                    {
                        "Ref": "CustomResourcesQueue"
                    }
                ]
            }
        }
    }
}