sam-template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: 'AWS::Serverless-2016-10-31'
Description: 'Generates a thumbnail for videos uploaded to a S3 bucket.'
Resources:
  InputBucket:
    Type: 'AWS::S3::Bucket'
    Properties:
      BucketName: !Ref InputBucketName
      NotificationConfiguration:
        TopicConfigurations:
          - Event: 's3:ObjectCreated:*'
            Topic: !Ref BucketCreatedTopic
    DependsOn: ['BucketCreatedTopicPolicy']
  ThumbnailBucket:
    Type: 'AWS::S3::Bucket'
    Properties: {}
  Topic:
    Type: 'AWS::SNS::Topic'
    Properties: {}
  BucketCreatedTopic:
    Type: 'AWS::SNS::Topic'
    Properties: {}
  BucketCreatedTopicPolicy:
    Type: AWS::SNS::TopicPolicy
    Properties:
      Topics:
        - !Ref BucketCreatedTopic
      PolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: Allow
            Principal:
              Service: s3.amazonaws.com
            Action: ['SNS:Publish']
            Resource: '*'
            Condition:
              ArnLike:
                'aws:SourceArn': !Join ['', ['arn:aws:s3:::', !Ref InputBucketName]]
  FfmpegLambdaLayer:
    Type: 'AWS::Serverless::Application'
    Properties:
      Location:
        ApplicationId: >-
          arn:aws:serverlessrepo:us-east-1:145266761615:applications/ffmpeg-lambda-layer
        SemanticVersion: 1.0.0
  ThumbnailFunction:
    Type: 'AWS::Serverless::Function'
    Properties:
      Handler: generateThumbnail.handler
      Runtime: nodejs12.x
      CodeUri: src
      MemorySize: 512
      Timeout: 60
      Policies:
        - AWSLambdaExecute
        - SNSPublishMessagePolicy:
            TopicName: !GetAtt Topic.TopicName
      Environment:
        Variables:
          THUMBNAIL_BUCKET: !Ref ThumbnailBucket
          SNS_TOPIC: !Ref Topic
          DEBUG: !Ref DebugLevel
          MARKS: !Ref Marks
      Layers:
        - !GetAtt FfmpegLambdaLayer.Outputs.LayerVersion
      Events:
        SNS:
          Type: SNS
          Properties:
            Topic: !Ref BucketCreatedTopic
Parameters:
  DebugLevel:
    Type: String
    Default: ""
    Description: "The DEBUG environment variable for the Lambda. Set to 'cloudformation-video-thumbnail' to enable debug."
  Marks:
    Type: String
    Default: '0.01,0.25,0.5,0.75,0.99'
    Description: "A comma-separated list of the points at which to take thumbnail screenshots."
  InputBucketName:
    Type: String
    Description: "The name of the video input bucket."
Outputs:
  InputBucket:
    Description: S3 Input Bucket
    Value: !Ref InputBucket
  InputBucketArn:
    Description: S3 Input Bucket ARN
    Value: !GetAtt InputBucket.Arn
  ThumbnailBucket:
    Description: Thumbnail Bucket
    Value: !Ref ThumbnailBucket
  ThumbnailBucketArn:
    Description: Thumbnail Bucket ARN
    Value: !GetAtt ThumbnailBucket.Arn
  Topic:
    Description: SNS Notification Topic
    Value: !Ref Topic
  S3Topic:
    Description: S3 Object Created SNS Topic
    Value: !Ref BucketCreatedTopic