AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: EventBridge destination bus - Cross-region destination bus and logging Lambda function

Parameters:
  EventSource:
    Type: String
    Description: Webhook source 
    Default: 'webhook'

Resources:
  MyEventBus:
    Type: AWS::Events::EventBus
    Properties:
      Name: "CrossRegionDestination"

  LoggerFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src/
      Handler: app.handler
      MemorySize: 128
      Timeout: 3
      Runtime: nodejs14.x

  EventRule: 
    Type: AWS::Events::Rule
    Properties: 
      Description: "EventRule"
      EventBusName: !Ref MyEventBus
      State: "ENABLED"
      EventPattern: 
        source:
          - !Ref EventSource     
      Targets: 
        - Arn: !GetAtt LoggerFunction.Arn
          Id: "ConsumerTarget"

  PermissionForEventsToInvokeLambda: 
    Type: AWS::Lambda::Permission
    Properties: 
      FunctionName: 
        Ref: "LoggerFunction"
      Action: "lambda:InvokeFunction"
      Principal: "events.amazonaws.com"
      SourceArn: !GetAtt EventRule.Arn