Resources:
  MyApiWithAuthSource:
    Type: AWS::Serverless::Api
    Properties:
      StageName: Prod
      Auth:
        ApiKeyRequired: true
      ApiKeySourceType: AUTHORIZER

  MyFunctionWithApiKeyRequiredTrue:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: s3://bucket/key
      Handler: index.handler
      Runtime: nodejs12.x
      Events:
        MyApiWithApiKeyRequiredTrue:
          Type: Api
          Properties:
            RestApiId: !Ref MyApiWithAuthSource
            Path: /ApiKeyTrue
            Method: get
            Auth:
              ApiKeyRequired: true