S3 Lambda example

s3-lambda.yaml

Transform: AWS::Serverless-2016-10-31
Resources:
  SourceBucket:
    Type: AWS::S3::Bucket
  DestinationBucket:
    Type: AWS::S3::Bucket
  Function:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src/Function
      Handler: handler.handler
      Runtime: python3.11
      Policies:
      - S3ReadPolicy:
          BucketName: !Ref SourceBucket
      - S3WritePolicy:
          BucketName: !Ref DestinationBucket
      Events:
        SourceBucket:
          Type: S3
          Properties:
            Bucket: !Ref SourceBucket
            Events:
              - s3:ObjectCreated:*
      Environment:
        Variables:
          DESTINATION_BUCKET_NAME: !Ref DestinationBucket