fix: support for 32-bit ASN (#52)

* Added support for 32-bit ASN

The variable `customer_gateway_bgp_asn` now automatically sets `bgp_asn` or `bgp_asn_extended` whether the value cannot be represented as a 32-bit number

* Applied terraform format

* Updated versions.tf

* Updated references according to AWS provider version

* Updated references according to AWS provider version

README.md

@@ -105,13 +105,13 @@ Available targets:
 | Name | Version |
 |------|---------|
 | <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.3.0 |
-| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 2.0 |
+| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.53.0 |
 
 ## Providers
 
 | Name | Version |
 |------|---------|
-| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 2.0 |
+| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.53.0 |
 
 ## Modules
 

docs/terraform.md

@@ -4,13 +4,13 @@
 | Name | Version |
 |------|---------|
 | <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.3.0 |
-| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 2.0 |
+| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.53.0 |
 
 ## Providers
 
 | Name | Version |
 |------|---------|
-| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 2.0 |
+| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.53.0 |
 
 ## Modules
 

main.tf

@@ -20,12 +20,13 @@ resource "aws_vpn_gateway" "default" {
 
 # https://www.terraform.io/docs/providers/aws/r/customer_gateway.html
 resource "aws_customer_gateway" "default" {
-  count       = local.enabled && var.customer_gateway_ip_address != null ? 1 : 0
-  device_name = module.this.id
-  bgp_asn     = var.customer_gateway_bgp_asn
-  ip_address  = var.customer_gateway_ip_address
-  type        = "ipsec.1"
-  tags        = module.this.tags
+  count            = local.enabled && var.customer_gateway_ip_address != null ? 1 : 0
+  device_name      = module.this.id
+  bgp_asn          = var.customer_gateway_bgp_asn <= 2147483647 ? var.customer_gateway_bgp_asn : null
+  bgp_asn_extended = var.customer_gateway_bgp_asn > 2147483647 ? var.customer_gateway_bgp_asn : null
+  ip_address       = var.customer_gateway_ip_address
+  type             = "ipsec.1"
+  tags             = module.this.tags
 
   lifecycle {
     create_before_destroy = true

versions.tf

@@ -4,7 +4,7 @@ terraform {
   required_providers {
     aws = {
       source  = "hashicorp/aws"
-      version = ">= 2.0"
+      version = ">= 5.53.0"
     }
   }
 }