template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31

Globals:
  Function:
    Timeout: 60

Resources:
  ListBucketsFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: com.example.App::handleRequest
      Runtime: java11
      Tracing: Active
      Architectures:
        - x86_64
      MemorySize: 512
      Environment:
        Variables:
          JAVA_TOOL_OPTIONS: -XX:+TieredCompilation -XX:TieredStopAtLevel=1
      Policies:
        - Version: '2012-10-17'
          Statement:
            - Effect: Allow
              Action:
                - s3:ListAllMyBuckets
              Resource: 'arn:aws:s3:::*'
      Events:
        HelloWorld:
          Type: Api
          Properties:
            Path: /listBuckets
            Method: get

Outputs:
  ListBucketsApi:
    Description: "API Gateway endpoint URL for Prod stage for Listing S3 Buckets function"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/listBuckets/"
  ListBucketsFunction:
    Description: "List S3 Buckets Lambda Function ARN"
    Value: !GetAtt ListBucketsFunction.Arn
  ListBucketsFunctionIamRole:
    Description: "Implicit IAM Role created for List Buckets function"
    Value: !GetAtt ListBucketsFunction.Arn