xdr-terraform-modules/base/splunk_servers/app_s3_bucket/main.tf

locals {
  bucket_name  = "xdr-${var.splunk_prefix}-${var.environment}-splunk-apps"
  accounts     = [var.aws_account_id]
  account_arns = [for a in local.accounts : "arn:${var.aws_partition}:iam::${a}:root"]
}

resource "aws_s3_bucket" "bucket" {
  bucket = local.bucket_name
  acl    = "private"

  versioning {
    enabled = false
  }

  tags = merge(var.standard_tags, var.tags)

  #logging {
  #  target_bucket = "dps-s3-logs"
  #  target_prefix = "aws_terraform_s3_state_access_logs/"
  #}

  lifecycle_rule {
    id      = "APPS_POLICY"
    enabled = true

    abort_incomplete_multipart_upload_days = 2

    transition {
      days          = 30
      storage_class = "INTELLIGENT_TIERING"
    }

    #    expiration {
    #      days = 365
    #    }
  }

  server_side_encryption_configuration {
    rule {
      apply_server_side_encryption_by_default {
        kms_master_key_id = aws_kms_key.bucketkey.arn
        sse_algorithm     = "aws:kms"
      }
    }
  }
}

resource "aws_s3_bucket_public_access_block" "public_access_block" {
  bucket                  = aws_s3_bucket.bucket.id
  block_public_acls       = true
  block_public_policy     = true
  ignore_public_acls      = true
  restrict_public_buckets = true

  # Not technically dependent, but prevents a "Conflicting conditional operation" conflict.
  # See https://github.com/hashicorp/terraform-provider-aws/issues/7628
  depends_on = [aws_s3_bucket_policy.policy]
}

data "aws_iam_policy_document" "policy" {
  statement {
    sid       = "AccountAllow"
    effect    = "Allow"
    resources = [
      "${aws_s3_bucket.bucket.arn}",
      "${aws_s3_bucket.bucket.arn}/*"
    ]

    actions = [
      "s3:GetObject",
      "s3:ListBucket",
    ]

    principals {
      type        = "AWS"
      identifiers = local.account_arns
    }
  }
}

resource "aws_s3_bucket_policy" "policy" {
  bucket = aws_s3_bucket.bucket.id

  policy = data.aws_iam_policy_document.policy.json
}