handle presets and custom v2

main.tf

variable "object_lifecycle_preset" {
  description = <<-EOL
  Choose a pre-configured set of object lifecycle rules for your bucket.
  - empty_bucket: Delete all objects from the bucket. Use this in preparation to destroy the bucket. This is non-recoverable.
  EOL
  type        = string
  default     = "default"
  validation {
    condition     = contains(["empty_bucket", "default"], var.object_lifecycle_preset)
    error_message = "You must select from one of the available presets: empty_bucket, default."
  }
}

variable "lifecycle_object_rules" {
  description = "List of object describing object lifecycle rules on the noncurrent versions of objects."
  type = list(object(
    {
      id                                     = string
      enabled                                = bool
      prefix                                 = optional(string)
      tags                                   = optional(map(string), {})
      object_size_greater_than               = optional(number)
      object_size_less_than                  = optional(number)
      abort_incomplete_multipart_upload_days = optional(number)
      transitions                            = optional(map(string), {})
      noncurrent_transitions                 = optional(map(string), {})
    }
  ))
  default = []
}

locals {
  lifecycle_rule_template = {
    id                                     = null
    prefix                                 = null
    tags                                   = {}
    enabled                                = null
    transitions                            = {}
    object_size_greater_than               = null
    object_size_less_than                  = null
    abort_incomplete_multipart_upload_days = null
    noncurrent_transitions                 = {}
    transitions                            = {}
  }

  lifecycle_presets = {
    default = [
      merge(local.lifecycle_rule_template,
        {
          id = "default noncurrent transition"
          # prefix = "foo/bar/"
          # tags = { "key" = "value", "key2" = "value2" }
          enabled = true
          # transitions = {
          #   standard_ia = 120
          # }
          object_size_greater_than = 1024 * 128
          noncurrent_transitions = {
            standard_ia = 30
          }
      }),
      merge(local.lifecycle_rule_template,
        {
          id                                     = "default noncurrent expiration"
          enabled                                = true
          abort_incomplete_multipart_upload_days = 1
          noncurrent_transitions = {
            expiration = 120
          }
          transitions = {
            expired_object_delete_marker = true
          }
      }),
    ]
    empty_bucket = [
      merge(local.lifecycle_rule_template,
        {
          id      = "empty bucket1"
          enabled = true
          noncurrent_transitions = {
            expiration = 1
          }
          transitions = {
            expiration = 1
          }
          abort_incomplete_multipart_upload_days = 1
      }),
      merge(local.lifecycle_rule_template,
        {
          id      = "empty bucket2"
          enabled = true
          transitions = {
            expired_object_delete_marker = true
          }
      }),
    ]
  }

  # If we have custom rules specified, use those. Otherwise use the preset.
  lifecycle_object_rules = length(var.lifecycle_object_rules) > 0 ? var.lifecycle_object_rules : local.lifecycle_presets[var.object_lifecycle_preset]
}