context.tf updated to v0.24.1, minimum required Terraform version bumped to...

context.tf updated to v0.24.1, minimum required Terraform version bumped to 0.13.0 when needed, readme updated (#107)

.github/CODEOWNERS

@@ -15,7 +15,8 @@
 
 # Cloud Posse must review any changes to standard context definition,
 # but some changes can be rubber-stamped.
-**/context.tf   @cloudposse/engineering @cloudposse/approvers
+**/*.tf       @cloudposse/engineering @cloudposse/approvers
+README.yaml   @cloudposse/engineering @cloudposse/approvers
 README.md     @cloudposse/engineering @cloudposse/contributors @cloudposse/approvers
 docs/*.md     @cloudposse/engineering @cloudposse/contributors @cloudposse/approvers
 

.github/auto-release.yml

@@ -43,3 +43,11 @@ change-template: |
 
 template: |
   $CHANGES
+
+replacers:
+# Remove irrelevant information from Renovate bot
+- search: '/---\s+^#.*Renovate configuration(?:.|\n)*?This PR has been generated .*/gm'
+  replace: ''
+# Remove Renovate bot banner image
+- search: '/\[!\[[^\]]*Renovate\][^\]]*\](\([^)]*\))?\s*\n+/gm'
+  replace: ''

.github/mergify.yml

+# https://docs.mergify.io/conditions.html
+# https://docs.mergify.io/actions.html
 pull_request_rules:
 - name: "approve automated PRs that have passed checks"
   conditions:
-  - "check-success~=test/bats"
-  - "check-success~=test/readme"
-  - "check-success~=test/terratest"
+  - "author~=^(cloudpossebot|renovate\\[bot\\])$"
   - "base=master"
-  - "author=cloudpossebot"
-  - "head~=auto-update/.*"
+  - "-closed"
+  - "head~=^(auto-update|renovate)/.*"
+  - "check-success=test/bats"
+  - "check-success=test/readme"
+  - "check-success=test/terratest"
+  - "check-success=validate-codeowners"
   actions:
     review:
       type: "APPROVE"
@@ -15,16 +19,17 @@ pull_request_rules:
 
 - name: "merge automated PRs when approved and tests pass"
   conditions:
-  - "check-success~=test/bats"
-  - "check-success~=test/readme"
-  - "check-success~=test/terratest"
+  - "author~=^(cloudpossebot|renovate\\[bot\\])$"
   - "base=master"
-  - "head~=auto-update/.*"
+  - "-closed"
+  - "head~=^(auto-update|renovate)/.*"
+  - "check-success=test/bats"
+  - "check-success=test/readme"
+  - "check-success=test/terratest"
+  - "check-success=validate-codeowners"
   - "#approved-reviews-by>=1"
   - "#changes-requested-reviews-by=0"
   - "#commented-reviews-by=0"
-  - "base=master"
-  - "author=cloudpossebot"
   actions:
     merge:
       method: "squash"
@@ -38,6 +43,7 @@ pull_request_rules:
 - name: "ask to resolve conflict"
   conditions:
   - "conflict"
+  - "-closed"
   actions:
     comment:
       message: "This pull request is now in conflict. Could you fix it @{{author}}? 🙏"

.github/workflows/auto-context.yml

@@ -27,17 +27,19 @@ jobs:
             make init
             make github/init/context.tf
             make readme/build
-            echo "::set-output name=create_pull_request=true"
+            echo "::set-output name=create_pull_request::true"
           fi
         else
           echo "This module has not yet been updated to support the context.tf pattern! Please update in order to support automatic updates."
         fi
 
     - name: Create Pull Request
-      if: {{ steps.update.outputs.create_pull_request == 'true' }}
+      if: steps.update.outputs.create_pull_request == 'true'
       uses: cloudposse/actions/github/create-pull-request@0.22.0
       with:
         token: ${{ secrets.PUBLIC_REPO_ACCESS_TOKEN }}
+        committer: 'cloudpossebot <11232728+cloudpossebot@users.noreply.github.com>'
+        author: 'cloudpossebot <11232728+cloudpossebot@users.noreply.github.com>'
         commit-message: Update context.tf from origin source
         title: Update context.tf
         body: |-

.github/workflows/auto-readme.yml

-name: "auto-readme"
-on:
-  schedule:
-  # Update README.md nightly
-  - cron:  '0 4 * * *'
-
-jobs:
-  update:
-    if: github.event_name == 'schedule'
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-
-    - name: Update readme
-      shell: bash
-      id: update
-      env:
-        GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
-      run: |
-        make init
-        make readme/build
-
-    - name: Create Pull Request
-      uses: cloudposse/actions/github/create-pull-request@0.20.0
-      with:
-        token: ${{ secrets.PUBLIC_REPO_ACCESS_TOKEN }}
-        commit-message: Update README.md and docs
-        title: Update README.md and docs
-        body: |-
-          ## what
-          This is an auto-generated PR that updates the README.md and docs
-
-          ## why
-          To have most recent changes of README.md and doc from origin templates
-
-        branch: auto-update/readme
-        base: master
-        delete-branch: true
-        labels: |
-          auto-update
-          readme

.github/workflows/auto-release.yml

@@ -6,7 +6,7 @@ on:
     - master
 
 jobs:
-  semver:
+  publish:
     runs-on: ubuntu-latest
     steps:
     # Drafts your next Release notes as Pull Requests are merged into "master"

.github/workflows/validate-codeowners.yml

@@ -9,6 +9,8 @@ jobs:
     - name: "Checkout source code at current commit"
       uses: actions/checkout@v2
     - uses: mszostok/codeowners-validator@v0.5.0
+      if: github.event.pull_request.head.repo.full_name == github.repository
+      name: "Full check of CODEOWNERS"
       with:
         # For now, remove "files" check to allow CODEOWNERS to specify non-existent
         # files so we can use the same CODEOWNERS file for Terraform and non-Terraform repos
@@ -16,3 +18,8 @@ jobs:
         checks: "syntax,owners,duppatterns"
         # GitHub access token is required only if the `owners` check is enabled
         github_access_token: "${{ secrets.PUBLIC_REPO_ACCESS_TOKEN }}"
+    - uses: mszostok/codeowners-validator@v0.5.0
+      if: github.event.pull_request.head.repo.full_name != github.repository
+      name: "Syntax check of CODEOWNERS"
+      with:
+        checks: "syntax,duppatterns"

README.md

@@ -185,7 +185,7 @@ Available targets:
 
 | Name | Version |
 |------|---------|
-| terraform | >= 0.12.26 |
+| terraform | >= 0.13.0 |
 | aws | >= 2.0 |
 | null | >= 2.0 |
 
@@ -216,7 +216,7 @@ Available targets:
 | cluster\_mode\_num\_node\_groups | Number of node groups (shards) for this Redis replication group. Changing this number will trigger an online resizing operation before other settings modifications | `number` | `0` | no |
 | cluster\_mode\_replicas\_per\_node\_group | Number of replica nodes in each node group. Valid values are 0 to 5. Changing this number will force a new resource | `number` | `0` | no |
 | cluster\_size | Number of nodes in cluster. \*Ignored when `cluster_mode_enabled` == `true`\* | `number` | `1` | no |
-| context | Single object for setting entire context at once.<br>See description of individual variables for details.<br>Leave string and numeric variables as `null` to use default value.<br>Individual variable settings (non-null) override settings in context object,<br>except for attributes, tags, and additional\_tag\_map, which are merged. | <pre>object({<br>    enabled             = bool<br>    namespace           = string<br>    environment         = string<br>    stage               = string<br>    name                = string<br>    delimiter           = string<br>    attributes          = list(string)<br>    tags                = map(string)<br>    additional_tag_map  = map(string)<br>    regex_replace_chars = string<br>    label_order         = list(string)<br>    id_length_limit     = number<br>  })</pre> | <pre>{<br>  "additional_tag_map": {},<br>  "attributes": [],<br>  "delimiter": null,<br>  "enabled": true,<br>  "environment": null,<br>  "id_length_limit": null,<br>  "label_order": [],<br>  "name": null,<br>  "namespace": null,<br>  "regex_replace_chars": null,<br>  "stage": null,<br>  "tags": {}<br>}</pre> | no |
+| context | Single object for setting entire context at once.<br>See description of individual variables for details.<br>Leave string and numeric variables as `null` to use default value.<br>Individual variable settings (non-null) override settings in context object,<br>except for attributes, tags, and additional\_tag\_map, which are merged. | `any` | <pre>{<br>  "additional_tag_map": {},<br>  "attributes": [],<br>  "delimiter": null,<br>  "enabled": true,<br>  "environment": null,<br>  "id_length_limit": null,<br>  "label_key_case": null,<br>  "label_order": [],<br>  "label_value_case": null,<br>  "name": null,<br>  "namespace": null,<br>  "regex_replace_chars": null,<br>  "stage": null,<br>  "tags": {}<br>}</pre> | no |
 | delimiter | Delimiter to be used between `namespace`, `environment`, `stage`, `name` and `attributes`.<br>Defaults to `-` (hyphen). Set to `""` to use no delimiter at all. | `string` | `null` | no |
 | dns\_subdomain | The subdomain to use for the CNAME record. If not provided then the CNAME record will use var.name. | `string` | `""` | no |
 | egress\_cidr\_blocks | Outbound traffic address | `list` | <pre>[<br>  "0.0.0.0/0"<br>]</pre> | no |
@@ -226,10 +226,12 @@ Available targets:
 | environment | Environment, e.g. 'uw2', 'us-west-2', OR 'prod', 'staging', 'dev', 'UAT' | `string` | `null` | no |
 | existing\_security\_groups | List of existing Security Group IDs to place the cluster into. Set `use_existing_security_groups` to `true` to enable using `existing_security_groups` as Security Groups for the cluster | `list(string)` | `[]` | no |
 | family | Redis family | `string` | `"redis4.0"` | no |
-| id\_length\_limit | Limit `id` to this many characters.<br>Set to `0` for unlimited length.<br>Set to `null` for default, which is `0`.<br>Does not affect `id_full`. | `number` | `null` | no |
+| id\_length\_limit | Limit `id` to this many characters (minimum 6).<br>Set to `0` for unlimited length.<br>Set to `null` for default, which is `0`.<br>Does not affect `id_full`. | `number` | `null` | no |
 | instance\_type | Elastic cache instance type | `string` | `"cache.t2.micro"` | no |
 | kms\_key\_id | The ARN of the key that you wish to use if encrypting at rest. If not supplied, uses service managed encryption. `at_rest_encryption_enabled` must be set to `true` | `string` | `null` | no |
+| label\_key\_case | The letter case of label keys (`tag` names) (i.e. `name`, `namespace`, `environment`, `stage`, `attributes`) to use in `tags`.<br>Possible values: `lower`, `title`, `upper`.<br>Default value: `title`. | `string` | `null` | no |
 | label\_order | The naming order of the id output and Name tag.<br>Defaults to ["namespace", "environment", "stage", "name", "attributes"].<br>You can omit any of the 5 elements, but at least one must be present. | `list(string)` | `null` | no |
+| label\_value\_case | The letter case of output label values (also used in `tags` and `id`).<br>Possible values: `lower`, `title`, `upper` and `none` (no transformation).<br>Default value: `lower`. | `string` | `null` | no |
 | maintenance\_window | Maintenance window | `string` | `"wed:03:00-wed:04:00"` | no |
 | name | Solution name, e.g. 'app' or 'jenkins' | `string` | `null` | no |
 | namespace | Namespace, which could be your organization name or abbreviation, e.g. 'eg' or 'cp' | `string` | `null` | no |

context.tf

@@ -20,7 +20,7 @@
 
 module "this" {
   source  = "cloudposse/label/null"
-  version = "0.22.1" // requires Terraform >= 0.12.26
+  version = "0.24.1" # requires Terraform >= 0.13.0
 
   enabled             = var.enabled
   namespace           = var.namespace
@@ -34,6 +34,8 @@ module "this" {
   label_order         = var.label_order
   regex_replace_chars = var.regex_replace_chars
   id_length_limit     = var.id_length_limit
+  label_key_case      = var.label_key_case
+  label_value_case    = var.label_value_case
 
   context = var.context
 }
@@ -41,20 +43,7 @@ module "this" {
 # Copy contents of cloudposse/terraform-null-label/variables.tf here
 
 variable "context" {
-  type = object({
-    enabled             = bool
-    namespace           = string
-    environment         = string
-    stage               = string
-    name                = string
-    delimiter           = string
-    attributes          = list(string)
-    tags                = map(string)
-    additional_tag_map  = map(string)
-    regex_replace_chars = string
-    label_order         = list(string)
-    id_length_limit     = number
-  })
+  type = any
   default = {
     enabled             = true
     namespace           = null
@@ -68,6 +57,8 @@ variable "context" {
     regex_replace_chars = null
     label_order         = []
     id_length_limit     = null
+    label_key_case      = null
+    label_value_case    = null
   }
   description = <<-EOT
     Single object for setting entire context at once.
@@ -76,6 +67,16 @@ variable "context" {
     Individual variable settings (non-null) override settings in context object,
     except for attributes, tags, and additional_tag_map, which are merged.
   EOT
+
+  validation {
+    condition     = lookup(var.context, "label_key_case", null) == null ? true : contains(["lower", "title", "upper"], var.context["label_key_case"])
+    error_message = "Allowed values: `lower`, `title`, `upper`."
+  }
+
+  validation {
+    condition     = lookup(var.context, "label_value_case", null) == null ? true : contains(["lower", "title", "upper", "none"], var.context["label_value_case"])
+    error_message = "Allowed values: `lower`, `title`, `upper`, `none`."
+  }
 }
 
 variable "enabled" {
@@ -158,11 +159,44 @@ variable "id_length_limit" {
   type        = number
   default     = null
   description = <<-EOT
-    Limit `id` to this many characters.
+    Limit `id` to this many characters (minimum 6).
     Set to `0` for unlimited length.
     Set to `null` for default, which is `0`.
     Does not affect `id_full`.
   EOT
+  validation {
+    condition     = var.id_length_limit == null ? true : var.id_length_limit >= 6 || var.id_length_limit == 0
+    error_message = "The id_length_limit must be >= 6 if supplied (not null), or 0 for unlimited length."
+  }
+}
+
+variable "label_key_case" {
+  type        = string
+  default     = null
+  description = <<-EOT
+    The letter case of label keys (`tag` names) (i.e. `name`, `namespace`, `environment`, `stage`, `attributes`) to use in `tags`.
+    Possible values: `lower`, `title`, `upper`.
+    Default value: `title`.
+  EOT
+
+  validation {
+    condition     = var.label_key_case == null ? true : contains(["lower", "title", "upper"], var.label_key_case)
+    error_message = "Allowed values: `lower`, `title`, `upper`."
+  }
 }
 
+variable "label_value_case" {
+  type        = string
+  default     = null
+  description = <<-EOT
+    The letter case of output label values (also used in `tags` and `id`).
+    Possible values: `lower`, `title`, `upper` and `none` (no transformation).
+    Default value: `lower`.
+  EOT
+
+  validation {
+    condition     = var.label_value_case == null ? true : contains(["lower", "title", "upper", "none"], var.label_value_case)
+    error_message = "Allowed values: `lower`, `title`, `upper`, `none`."
+  }
+}
 #### End of copy of cloudposse/terraform-null-label/variables.tf

docs/terraform.md

@@ -3,7 +3,7 @@
 
 | Name | Version |
 |------|---------|
-| terraform | >= 0.12.26 |
+| terraform | >= 0.13.0 |
 | aws | >= 2.0 |
 | null | >= 2.0 |
 
@@ -34,7 +34,7 @@
 | cluster\_mode\_num\_node\_groups | Number of node groups (shards) for this Redis replication group. Changing this number will trigger an online resizing operation before other settings modifications | `number` | `0` | no |
 | cluster\_mode\_replicas\_per\_node\_group | Number of replica nodes in each node group. Valid values are 0 to 5. Changing this number will force a new resource | `number` | `0` | no |
 | cluster\_size | Number of nodes in cluster. \*Ignored when `cluster_mode_enabled` == `true`\* | `number` | `1` | no |
-| context | Single object for setting entire context at once.<br>See description of individual variables for details.<br>Leave string and numeric variables as `null` to use default value.<br>Individual variable settings (non-null) override settings in context object,<br>except for attributes, tags, and additional\_tag\_map, which are merged. | <pre>object({<br>    enabled             = bool<br>    namespace           = string<br>    environment         = string<br>    stage               = string<br>    name                = string<br>    delimiter           = string<br>    attributes          = list(string)<br>    tags                = map(string)<br>    additional_tag_map  = map(string)<br>    regex_replace_chars = string<br>    label_order         = list(string)<br>    id_length_limit     = number<br>  })</pre> | <pre>{<br>  "additional_tag_map": {},<br>  "attributes": [],<br>  "delimiter": null,<br>  "enabled": true,<br>  "environment": null,<br>  "id_length_limit": null,<br>  "label_order": [],<br>  "name": null,<br>  "namespace": null,<br>  "regex_replace_chars": null,<br>  "stage": null,<br>  "tags": {}<br>}</pre> | no |
+| context | Single object for setting entire context at once.<br>See description of individual variables for details.<br>Leave string and numeric variables as `null` to use default value.<br>Individual variable settings (non-null) override settings in context object,<br>except for attributes, tags, and additional\_tag\_map, which are merged. | `any` | <pre>{<br>  "additional_tag_map": {},<br>  "attributes": [],<br>  "delimiter": null,<br>  "enabled": true,<br>  "environment": null,<br>  "id_length_limit": null,<br>  "label_key_case": null,<br>  "label_order": [],<br>  "label_value_case": null,<br>  "name": null,<br>  "namespace": null,<br>  "regex_replace_chars": null,<br>  "stage": null,<br>  "tags": {}<br>}</pre> | no |
 | delimiter | Delimiter to be used between `namespace`, `environment`, `stage`, `name` and `attributes`.<br>Defaults to `-` (hyphen). Set to `""` to use no delimiter at all. | `string` | `null` | no |
 | dns\_subdomain | The subdomain to use for the CNAME record. If not provided then the CNAME record will use var.name. | `string` | `""` | no |
 | egress\_cidr\_blocks | Outbound traffic address | `list` | <pre>[<br>  "0.0.0.0/0"<br>]</pre> | no |
@@ -44,10 +44,12 @@
 | environment | Environment, e.g. 'uw2', 'us-west-2', OR 'prod', 'staging', 'dev', 'UAT' | `string` | `null` | no |
 | existing\_security\_groups | List of existing Security Group IDs to place the cluster into. Set `use_existing_security_groups` to `true` to enable using `existing_security_groups` as Security Groups for the cluster | `list(string)` | `[]` | no |
 | family | Redis family | `string` | `"redis4.0"` | no |
-| id\_length\_limit | Limit `id` to this many characters.<br>Set to `0` for unlimited length.<br>Set to `null` for default, which is `0`.<br>Does not affect `id_full`. | `number` | `null` | no |
+| id\_length\_limit | Limit `id` to this many characters (minimum 6).<br>Set to `0` for unlimited length.<br>Set to `null` for default, which is `0`.<br>Does not affect `id_full`. | `number` | `null` | no |
 | instance\_type | Elastic cache instance type | `string` | `"cache.t2.micro"` | no |
 | kms\_key\_id | The ARN of the key that you wish to use if encrypting at rest. If not supplied, uses service managed encryption. `at_rest_encryption_enabled` must be set to `true` | `string` | `null` | no |
+| label\_key\_case | The letter case of label keys (`tag` names) (i.e. `name`, `namespace`, `environment`, `stage`, `attributes`) to use in `tags`.<br>Possible values: `lower`, `title`, `upper`.<br>Default value: `title`. | `string` | `null` | no |
 | label\_order | The naming order of the id output and Name tag.<br>Defaults to ["namespace", "environment", "stage", "name", "attributes"].<br>You can omit any of the 5 elements, but at least one must be present. | `list(string)` | `null` | no |
+| label\_value\_case | The letter case of output label values (also used in `tags` and `id`).<br>Possible values: `lower`, `title`, `upper` and `none` (no transformation).<br>Default value: `lower`. | `string` | `null` | no |
 | maintenance\_window | Maintenance window | `string` | `"wed:03:00-wed:04:00"` | no |
 | name | Solution name, e.g. 'app' or 'jenkins' | `string` | `null` | no |
 | namespace | Namespace, which could be your organization name or abbreviation, e.g. 'eg' or 'cp' | `string` | `null` | no |

examples/complete/context.tf

@@ -20,7 +20,7 @@
 
 module "this" {
   source  = "cloudposse/label/null"
-  version = "0.22.1" // requires Terraform >= 0.12.26
+  version = "0.24.1" # requires Terraform >= 0.13.0
 
   enabled             = var.enabled
   namespace           = var.namespace
@@ -34,6 +34,8 @@ module "this" {
   label_order         = var.label_order
   regex_replace_chars = var.regex_replace_chars
   id_length_limit     = var.id_length_limit
+  label_key_case      = var.label_key_case
+  label_value_case    = var.label_value_case
 
   context = var.context
 }
@@ -41,20 +43,7 @@ module "this" {
 # Copy contents of cloudposse/terraform-null-label/variables.tf here
 
 variable "context" {
-  type = object({
-    enabled             = bool
-    namespace           = string
-    environment         = string
-    stage               = string
-    name                = string
-    delimiter           = string
-    attributes          = list(string)
-    tags                = map(string)
-    additional_tag_map  = map(string)
-    regex_replace_chars = string
-    label_order         = list(string)
-    id_length_limit     = number
-  })
+  type = any
   default = {
     enabled             = true
     namespace           = null
@@ -68,6 +57,8 @@ variable "context" {
     regex_replace_chars = null
     label_order         = []
     id_length_limit     = null
+    label_key_case      = null
+    label_value_case    = null
   }
   description = <<-EOT
     Single object for setting entire context at once.
@@ -76,6 +67,16 @@ variable "context" {
     Individual variable settings (non-null) override settings in context object,
     except for attributes, tags, and additional_tag_map, which are merged.
   EOT
+
+  validation {
+    condition     = lookup(var.context, "label_key_case", null) == null ? true : contains(["lower", "title", "upper"], var.context["label_key_case"])
+    error_message = "Allowed values: `lower`, `title`, `upper`."
+  }
+
+  validation {
+    condition     = lookup(var.context, "label_value_case", null) == null ? true : contains(["lower", "title", "upper", "none"], var.context["label_value_case"])
+    error_message = "Allowed values: `lower`, `title`, `upper`, `none`."
+  }
 }
 
 variable "enabled" {
@@ -158,11 +159,44 @@ variable "id_length_limit" {
   type        = number
   default     = null
   description = <<-EOT
-    Limit `id` to this many characters.
+    Limit `id` to this many characters (minimum 6).
     Set to `0` for unlimited length.
     Set to `null` for default, which is `0`.
     Does not affect `id_full`.
   EOT
+  validation {
+    condition     = var.id_length_limit == null ? true : var.id_length_limit >= 6 || var.id_length_limit == 0
+    error_message = "The id_length_limit must be >= 6 if supplied (not null), or 0 for unlimited length."
+  }
+}
+
+variable "label_key_case" {
+  type        = string
+  default     = null
+  description = <<-EOT
+    The letter case of label keys (`tag` names) (i.e. `name`, `namespace`, `environment`, `stage`, `attributes`) to use in `tags`.
+    Possible values: `lower`, `title`, `upper`.
+    Default value: `title`.
+  EOT
+
+  validation {
+    condition     = var.label_key_case == null ? true : contains(["lower", "title", "upper"], var.label_key_case)
+    error_message = "Allowed values: `lower`, `title`, `upper`."
+  }
 }
 
+variable "label_value_case" {
+  type        = string
+  default     = null
+  description = <<-EOT
+    The letter case of output label values (also used in `tags` and `id`).
+    Possible values: `lower`, `title`, `upper` and `none` (no transformation).
+    Default value: `lower`.
+  EOT
+
+  validation {
+    condition     = var.label_value_case == null ? true : contains(["lower", "title", "upper", "none"], var.label_value_case)
+    error_message = "Allowed values: `lower`, `title`, `upper`, `none`."
+  }
+}
 #### End of copy of cloudposse/terraform-null-label/variables.tf

examples/complete/versions.tf

 terraform {
-  required_version = ">= 0.12.26"
+  required_version = ">= 0.13.0"
 
   required_providers {
     aws = {

main.tf

@@ -162,7 +162,7 @@ resource "aws_cloudwatch_metric_alarm" "cache_memory" {
 
 module "dns" {
   source  = "cloudposse/route53-cluster-hostname/aws"
-  version = "0.10.1"
+  version = "0.12.0"
 
   enabled  = module.this.enabled && var.zone_id != "" ? true : false
   dns_name = var.dns_subdomain != "" ? var.dns_subdomain : module.this.id

versions.tf

 terraform {
-  required_version = ">= 0.12.26"
+  required_version = ">= 0.13.0"
 
   required_providers {
     aws = {