AWSTemplateFormatVersion: 2010-09-09
Transform: AWS::Serverless-2016-10-31
Description: aws-publisher-subscriber-pattern

Globals:
  Function:
    Runtime: java11
    MemorySize: 3072
    Timeout: 30

Resources:
#Lambda Publisher
  PaymentPublisher:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: PaymentPublisher
      Handler: com.example.publisher.PaymentPublisher::handleRequest
      CodeUri: target/sourceCode.zip
      Policies:
        - SNSPublishMessagePolicy:
            TopicName: !GetAtt PaymentsSNS.TopicName
      Environment:
        Variables:
          TOPIC_ARN: !Ref PaymentsSNS

  #Lambda Subscriber
  PaymentSubscriber:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: PaymentSubscriber
      Handler: com.example.subscriber.PaymentSubscriber::handleRequest
      CodeUri: target/sourceCode.zip

  #SNS Topic
  PaymentsSNS:
    Type: AWS::SNS::Topic
    Properties:
      TopicName: PaymentsTopic
      Subscription:
        - Protocol: lambda
          Endpoint: !GetAtt PaymentSubscriber.Arn

  #Permissions
  SNSInvokePaymentSubscriber:
    Type: 'AWS::Lambda::Permission'
    Properties:
      Action: 'lambda:InvokeFunction'
      FunctionName: !Ref PaymentSubscriber
      Principal: sns.amazonaws.com