template.yaml

AWSTemplateFormatVersion: 2010-09-09
Transform: AWS::Serverless-2016-10-31
Globals:
  Function:
    MemorySize: 128
    Timeout: 15

Resources:

  # Permissions
  AllowS3ToCallLambdaPermission:
    Type: AWS::Lambda::Permission
    Properties:
      Action: 'lambda:InvokeFunction'
      FunctionName: !Ref S3TriggeredLambdaHandler
      Principal: s3.amazonaws.com
      SourceArn: !GetAtt S3Bucket.Arn

  # Functions
  S3TriggeredLambdaHandler:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: .
      Handler: lambda.handler
      Description: Function that is called when a file is stored in S3.
      Runtime: nodejs12.x
      Events:
        S3Bucket:
          Type: S3
          Properties:
            Bucket: !Ref S3Bucket
            Events: 's3:ObjectCreated:*'

  # S3 Bucket
  S3Bucket:
    Type: AWS::S3::Bucket