AWSTemplateFormatVersion: '2010-09-09'
Resources:
  UncompressFunctionDLQ:
    Type: AWS::SQS::Queue
  UncompressorSourceBucket:
    DependsOn:
    - UncompressFunctionuploadPermission
    Type: AWS::S3::Bucket
    Properties:
      NotificationConfiguration:
        LambdaConfigurations:
        - Function:
            Fn::GetAtt:
            - UncompressFunction
            - Arn
          Event: s3:ObjectCreated:*
      BucketName:
        Ref: SourceBucketName
    Metadata:
      Description: Uploading compressed file to this bucket will trigger the Lambda (and uncompress the contents)
  UncompressFunction:
    Type: AWS::Serverless::Function
    Properties:
      Policies:
      - Statement:
        - Action:
          - s3:GetObject
          - s3:ListBucket
          - s3:GetBucketLocation
          - s3:GetObjectVersion
          - s3:PutObject
          - s3:GetLifecycleConfiguration
          - s3:PutLifecycleConfiguration
          Resource:
          - Fn::Sub:
            - arn:${AWS::Partition}:s3:::${bucketName}
            - bucketName:
                Ref: DestinationBucketName
          - Fn::Sub:
            - arn:${AWS::Partition}:s3:::${bucketName}/*
            - bucketName:
                Ref: DestinationBucketName
          Effect: Allow
      - Statement:
        - Action:
          - s3:GetObject
          - s3:ListBucket
          - s3:GetBucketLocation
          - s3:GetObjectVersion
          - s3:PutObject
          - s3:GetLifecycleConfiguration
          - s3:PutLifecycleConfiguration
          Resource:
          - Fn::Sub:
            - arn:${AWS::Partition}:s3:::${bucketName}
            - bucketName:
                Ref: SourceBucketName
          - Fn::Sub:
            - arn:${AWS::Partition}:s3:::${bucketName}/*
            - bucketName:
                Ref: SourceBucketName
          Effect: Allow
      MemorySize:
        Ref: LambdaFunctionMemorySize
      Environment:
        Variables:
          DESTINATION_BUCKET:
            Ref: DestinationBucketName
      CodeUri:
        Bucket: <%REPO_BUCKET%>
        Key: a92537c9-2f6a-42b3-aa4b-eb47d749a7fb
      Handler: s3_uncompressor.lambda_handler.main
      Timeout:
        Ref: LambdaFunctionTimeout
      DeadLetterQueue:
        TargetArn:
          Fn::GetAtt:
          - UncompressFunctionDLQ
          - Arn
        Type: SQS
      Runtime: python3.9
      Events:
        upload:
          Type: S3
          Properties:
            Bucket:
              Ref: UncompressorSourceBucket
            Events: s3:ObjectCreated:*
      Description: Uncompresses files uploaded to the S3 bucket
Transform: AWS::Serverless-2016-10-31
Parameters:
  DestinationBucketName:
    Type: String
    Description: Bucket to which contents of uncompressed files will be written to. Use the same value as in SourceBucketName to uncompress to the same bucket where file was uploaded, however keep in mind that using the same bucket as a destination will recursively uncompress all of the files that were inside uploaded archive.
  LambdaFunctionMemorySize:
    Default: 128
    Type: Number
    Description: Amount of memory dedicated for Lambda function (the more, the bigger archive it will be able to uncompress)
  SourceBucketName:
    Type: String
    Description: Bucket to which compressed files will be uploaded (will be created, so the bucket cannot exist already!)
  LambdaFunctionTimeout:
    Default: 60
    Type: Number
    Description: Maximum time for how long Lambda can be runing
Description: Unzips uploaded zip files in the S3 bucket