AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::Serverless-2016-10-31
Description: >
  This template deploys a code sample for testing an asynchronous architecture using Typescript.

Parameters:
  DeployTestResources:
    Description: The parameter instructs the template whether or not to deploy test resources to your environment.
    Default: "True"
    Type: String
    AllowedValues:
      - "True"
      - "False"
    ConstraintDescription: Allowed values are True and False

Conditions:
  CreateTestResources: !Equals [!Ref DeployTestResources, "True"]

Globals: # https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-specification-template-anatomy-globals.html
  Function:
    Timeout: 15
    MemorySize: 256
    Runtime: nodejs18.x
    Architectures:
        - x86_64
    Tracing: Active # https://docs.aws.amazon.com/lambda/latest/dg/lambda-x-ray.html
    Environment:
      Variables:
        DESTINATION_BUCKET: !Sub "async-destination-${AWS::StackName}-${AWS::AccountId}"
        RESULTS_TABLE: !Sub "async-results-${AWS::StackName}-${AWS::AccountId}"

Resources:
  SourceBucket:
    Type: AWS::S3::Bucket
    UpdateReplacePolicy: Delete
    Properties:
      BucketName: !Sub "async-source-${AWS::StackName}-${AWS::AccountId}"
      BucketEncryption:
        ServerSideEncryptionConfiguration:
          - ServerSideEncryptionByDefault:
              SSEAlgorithm: AES256
      PublicAccessBlockConfiguration:
        BlockPublicAcls: true
        BlockPublicPolicy: true
        IgnorePublicAcls: true
        RestrictPublicBuckets: true

  DestinationBucket:
    Type: AWS::S3::Bucket
    UpdateReplacePolicy: Delete
    Properties:
      BucketName: !Sub "async-destination-${AWS::StackName}-${AWS::AccountId}"
      BucketEncryption:
        ServerSideEncryptionConfiguration:
          - ServerSideEncryptionByDefault:
              SSEAlgorithm: AES256
      PublicAccessBlockConfiguration:
        BlockPublicAcls: true
        BlockPublicPolicy: true
        IgnorePublicAcls: true
        RestrictPublicBuckets: true

  ToUppercaseTextTransformer:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: !Sub "ToUppercaseTextTransformer-${AWS::StackName}-${AWS::AccountId}"
      CodeUri: src/
      Handler: app.handler
      Policies:
        - S3ReadPolicy:
            BucketName: !Sub "async-source-${AWS::StackName}-${AWS::AccountId}"
        - S3CrudPolicy:
            BucketName: !Sub "async-destination-${AWS::StackName}-${AWS::AccountId}"
      Events:
        FileUpload:
          Type: S3
          Properties:
            Bucket: !Ref SourceBucket
            Events: s3:ObjectCreated:*
            Filter:
              S3Key:
                Rules:
                  - Name: suffix
                    Value: ".txt"
    Metadata: # Manage esbuild properties
      BuildMethod: esbuild
      BuildProperties:
        Minify: true
        Target: "es2020"
        # Sourcemap: true # Enabling source maps will create the required NODE_OPTIONS environment variables on your lambda function during sam build
        EntryPoints: 
          - app.ts

  AsyncTransformTestResultsTable:
    Type: AWS::DynamoDB::Table
    Condition: CreateTestResources
    Properties:
      TableName: !Sub "async-results-${AWS::StackName}-${AWS::AccountId}"
      AttributeDefinitions:
        - AttributeName: id
          AttributeType: S
      KeySchema:
        - AttributeName: id
          KeyType: HASH
      ProvisionedThroughput:
        ReadCapacityUnits: 2
        WriteCapacityUnits: 2

  DestinationBucketListener:
    Type: AWS::Serverless::Function
    Condition: CreateTestResources
    Properties:
      FunctionName: !Sub "DestinationBucketListener-${AWS::StackName}-${AWS::AccountId}"
      CodeUri: src/tests/integration/
      Handler: event_listener_lambda.handler
      Policies:
        - DynamoDBWritePolicy:
            TableName: !Ref AsyncTransformTestResultsTable
        - S3ReadPolicy:
            BucketName: !Sub "async-destination-${AWS::StackName}-${AWS::AccountId}"
      Events:
        FileUpload:
          Type: S3
          Properties:
            Bucket: !Ref DestinationBucket
            Events: s3:ObjectCreated:*
            Filter:
              S3Key:
                Rules:
                  - Name: suffix
                    Value: ".txt"
    Metadata: # Manage esbuild properties
      BuildMethod: esbuild
      BuildProperties:
        Minify: true
        Target: "es2020"
        # Sourcemap: true # Enabling source maps will create the required NODE_OPTIONS environment variables on your lambda function during sam build
        EntryPoints: 
          - event_listener_lambda.ts

Outputs:
  SourceBucketName:
    Description: "Source bucket for asynchronous testing sample"
    Value: !Ref SourceBucket

  DestinationBucketName:
    Description: "Destination bucket for asynchronous testing sample"
    Value: !Ref DestinationBucket

  DestinationBucketListenerName:
    Condition: CreateTestResources
    Description: "Lambda Function to listen for test results"
    Value: !Ref DestinationBucketListener

  AsyncTransformTestResultsTable:
    Condition: CreateTestResources
    Description: "DynamoDB table to persist test results"
    Value: !Ref AsyncTransformTestResultsTable