AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: Serverless patterns - SNS to SQS

Resources:
  # Define the SQS queue
  MySqsQueue:
    Type: AWS::SQS::Queue

  # Define the SNS topic
  MySnsTopic:
    Type: AWS::SNS::Topic
    Properties:
      # Subscribes the SQS queue to the SNS topic
      Subscription:
        - Protocol: sqs
          Endpoint: !GetAtt MySqsQueue.Arn

  # Policy allows SNS to publish to this SQS queue
  SnsToSqsPolicy:
    Type: AWS::SQS::QueuePolicy
    Properties:
      PolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Sid: "Allow SNS publish to SQS"
            Effect: Allow
            Principal: 
              Service: "sns.amazonaws.com"
            Resource: !GetAtt MySqsQueue.Arn
            Action: SQS:SendMessage
            Condition:
              ArnEquals:
                aws:SourceArn: !Ref MySnsTopic
      Queues:
        - Ref: MySqsQueue

Outputs:
  MySqsQueueName:
    Description: SQS queue name
    Value: !GetAtt MySqsQueue.QueueName
  MySqsQueueArn:
    Description: SQS queue ARN
    Value: !GetAtt MySqsQueue.Arn
  MySqsQueueURL:
    Description: SQS queue URL
    Value: !Ref MySqsQueue    
  MySnsTopicName:
    Description: SNS topic name
    Value: !GetAtt MySnsTopic.TopicName
  MySnsTopicArn:
    Description: SNS topic ARN
    Value: !Ref MySnsTopic