template.yaml

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

Description: Template that creates a S3 bucket, SQS Queue and a Lambda function 
  that will be invoked when new objects are upload to the bucket.
  Then queue a new message with that file details 
Globals:
  Function:
    MemorySize: 256
    Architectures: [arm64]
    Runtime: dotnet8
    Timeout: 300
    Tracing: Active
Parameters: 
  BucketName:
    Type: String
    Description: Name of S3 bucket to be created. 
      The Lambda function will be invoked when new objects are upload to the bucket. 
      If left blank a name will be generated.
    MinLength: "0"    
Conditions:
  BucketNameGenerated:
    !Equals [!Ref BucketName, ""] 
Resources:
  S3Function:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: ./src/S3Notifications
      Handler: S3Notifications::S3Notifications.Function::FunctionHandler
      Policies:
        - AWSLambda_FullAccess
        - Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action: sqs:SendMessage
              Resource: !GetAtt NotificationQueue.Arn
      Environment: 
        Variables: 
          QUEUE_URL: !Ref NotificationQueue
      Events: 
        NewS3Event:
          Type: S3
          Properties:
            Bucket: !Ref MonitoredBucket
            Events: 
              - s3:ObjectCreated:*              
  NotificationQueue:
    Type: AWS::SQS::Queue    
  MonitoredBucket:
    Type: AWS::S3::Bucket
    Properties: 
      BucketName: 
        !If [BucketNameGenerated, !Ref AWS::NoValue, !Ref BucketName]
Outputs:
  S3BucketName: 
    Value: !Ref MonitoredBucket
    Description: Bucket that will invoke the lambda function when new objects are created.
  QueueUrl: 
    Value: !Ref NotificationQueue
    Description: Queue that would receive notification after S3 related events