S3 -> SNS topic

serverless.yml

  Resources:
    # ===================== SNS =====================
    DataframeCreatedSnsTopic:
      Type: AWS::SNS::Topic
      Properties:
        DisplayName: "Topic to notify functions of dataframe creation"
        TopicName: DataframeCreatedSnsTopic
    # ===================== SNS Policy =====================
    DataframeCreatedSnsTopic:
      Type: AWS::SNS::TopicPolicy
      Properties:
        PolicyDocument:
          Version: "2012-10-17"
          Statement:
            - Sid: AllowBucketToPushNotificationEffect
              Effect: Allow
              Principal:
                Service: s3.amazonaws.com
              Action: sns:Publish
              Resource: arn:aws:sns:${env:REGION}:${env:AWS_ACCOUNT}:*
        Topics:
          - Ref: DataframeCreatedSnsTopic
      # ===================== S3 =====================
      WorkingStorage:
        Type: AWS::S3::Bucket
        DeletionPolicy: Retain
        Properties:
          BucketName: ${self:custom.workingBucket}  
          NotificationConfiguration:
          TopicConfigurations:
            - Event: s3:ObjectCreated:*
              Filter:
                S3Key: 
                  Rules:
                    - Name: suffix
                      Value: '.json'
              Topic:
                Ref: DataframeCreatedSnsTopic