juntekim.com/aws_infra/modules/s3_bucket/main.tf

resource "aws_s3_bucket" "this" {
  bucket = var.bucket_name
}

resource "aws_s3_bucket_versioning" "this" {
  bucket = aws_s3_bucket.this.id

  versioning_configuration {
    status = var.versioning_enabled ? "Enabled" : "Disabled"
  }
}

resource "aws_s3_bucket_server_side_encryption_configuration" "this" {
  bucket = aws_s3_bucket.this.id

  rule {
    apply_server_side_encryption_by_default {
      sse_algorithm = "AES256"
    }
  }
}

resource "aws_s3_bucket_public_access_block" "this" {
  bucket = aws_s3_bucket.this.id

  block_public_acls       = true
  block_public_policy     = true
  ignore_public_acls      = true
  restrict_public_buckets = true
}

resource "aws_s3_bucket_lifecycle_configuration" "this" {
  count  = var.retention_days > 0 ? 1 : 0
  bucket = aws_s3_bucket.this.id

  rule {
    id     = "expire-objects"
    status = "Enabled"

    filter {}

    transition {
      days          = 30
      storage_class = "STANDARD_IA"
    }

    expiration {
      days = var.retention_days
    }
  }
}