AWSTemplateFormatVersion: "2010-09-09"
Description: >
  This CloudFormation template provisions all the infrastructure that is
  required to upload artifacts to CloudFormation's managed experience.

Resources:
  ArtifactBucket:
    Type: AWS::S3::Bucket
    DeletionPolicy: Delete
    UpdateReplacePolicy: Delete
    Properties:
      AccessControl: BucketOwnerFullControl
      BucketEncryption:
        ServerSideEncryptionConfiguration:
        - ServerSideEncryptionByDefault:
            SSEAlgorithm: aws:kms
            KMSMasterKeyID: !Ref EncryptionKey
      LifecycleConfiguration:
        Rules:
          - Id: MultipartUploadLifecycleRule
            Status: Enabled
            AbortIncompleteMultipartUpload:
              DaysAfterInitiation: 1
      VersioningConfiguration:
        Status: Enabled
      LoggingConfiguration:
        DestinationBucketName: !Ref AccessLogsBucket
        LogFilePrefix: ArtifactBucket
      PublicAccessBlockConfiguration:
        BlockPublicAcls: true
        BlockPublicPolicy: true
        IgnorePublicAcls: true
        RestrictPublicBuckets: true

  AccessLogsBucket:
    Type: AWS::S3::Bucket
    DeletionPolicy: Retain
    UpdateReplacePolicy: Retain
    Properties:
      BucketEncryption:
        ServerSideEncryptionConfiguration:
        - ServerSideEncryptionByDefault:
            SSEAlgorithm: AES256
      LifecycleConfiguration:
        Rules:
          - Id: ExpireObjectsLifecycleRule
            Status: Enabled
            ExpirationInDays: 3653
            NoncurrentVersionExpiration:
              NoncurrentDays: 1
          - Id: ExpiredObjectDeleteMarkerLifecycleRule
            Status: Enabled
            ExpiredObjectDeleteMarker: true
      VersioningConfiguration:
        Status: Enabled
      PublicAccessBlockConfiguration:
        BlockPublicAcls: true
        BlockPublicPolicy: true
        IgnorePublicAcls: true
        RestrictPublicBuckets: true

  ArtifactCopyPolicy:
    Type: AWS::S3::BucketPolicy
    Properties:
      Bucket: !Ref ArtifactBucket
      PolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Sid: Require Secure Transport
            Action: "s3:*"
            Effect: Deny
            Resource:
              - !Sub "arn:${AWS::Partition}:s3:::${ArtifactBucket}"
              - !Sub "arn:${AWS::Partition}:s3:::${ArtifactBucket}/*"
            Condition:
              Bool:
                "aws:SecureTransport": "false"
            Principal: "*"

  AccessLogsBucketPolicy:
    Type: AWS::S3::BucketPolicy
    Properties:
      Bucket: !Ref AccessLogsBucket
      PolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Sid: Require Secure Transport
            Action: "s3:*"
            Effect: Deny
            Resource:
              - !Sub "arn:${AWS::Partition}:s3:::${AccessLogsBucket}"
              - !Sub "arn:${AWS::Partition}:s3:::${AccessLogsBucket}/*"
            Condition:
              Bool:
                "aws:SecureTransport": "false"
            Principal: "*"
          - Sid: S3 Server Access Logs Policy
            Effect: Allow
            Principal:
              Service: logging.s3.amazonaws.com
            Action: s3:PutObject
            Resource: !Sub "arn:${AWS::Partition}:s3:::${AccessLogsBucket}/ArtifactBucket*"
            Condition:
              ArnLike:
                aws:SourceArn: !Sub "arn:${AWS::Partition}:s3:::${ArtifactBucket}"
              StringEquals:
                aws:SourceAccount: !Ref AWS::AccountId

  EncryptionKey:
    Type: AWS::KMS::Key
    DeletionPolicy: Retain
    UpdateReplacePolicy: Retain
    Properties:
      Description: KMS key used to encrypt the resource type artifacts
      EnableKeyRotation: true
      KeyPolicy:
        Version: "2012-10-17"
        Statement:
        - Sid: Enable full access for owning account
          Effect: Allow
          Principal:
            AWS: !Ref AWS::AccountId
          Action: kms:*
          Resource: "*"

  DummyResource:
    Type: AWS::CloudFormation::WaitConditionHandle

  LogAndMetricsDeliveryRole:
    Type: AWS::IAM::Role
    Properties:
      MaxSessionDuration: 43200
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
        - Effect: Allow
          Principal:
            Service:
              - resources.cloudformation.amazonaws.com
              - hooks.cloudformation.amazonaws.com
          Action: sts:AssumeRole
      Path: "/"
      Policies:
      - PolicyName: LogAndMetricsDeliveryRolePolicy
        PolicyDocument:
          Version: "2012-10-17"
          Statement:
          - Effect: Allow
            Action:
            - logs:CreateLogGroup
            - logs:CreateLogStream
            - logs:DescribeLogGroups
            - logs:DescribeLogStreams
            - logs:PutLogEvents
            - cloudwatch:ListMetrics
            - cloudwatch:PutMetricData
            Resource: "*"

Outputs:
  CloudFormationManagedUploadBucketName:
    Value: !Ref ArtifactBucket
  LogAndMetricsDeliveryRoleArn:
    Value: !GetAtt LogAndMetricsDeliveryRole.Arn