refactor module to allow custom cache policy for static assets

Author: andylamp

main.tf

@@ -24,10 +24,11 @@ module "assets" {
   region       = local.aws_region
   default_tags = var.default_tags
 
-  prefix                   = "${var.prefix}-assets"
-  assets_path              = "${local.opennext_abs_path}/assets"
-  cache_path               = "${local.opennext_abs_path}/cache"
-  server_function_role_arn = module.server_function.lambda_role.arn
+  prefix                    = "${var.prefix}-assets"
+  assets_path               = "${local.opennext_abs_path}/assets"
+  cache_path                = "${local.opennext_abs_path}/cache"
+  server_function_role_arn  = module.server_function.lambda_role.arn
+  static_asset_cache_config = var.static_asset_cache_config
 }
 
 

modules/opennext-assets/s3.tf

@@ -191,7 +191,7 @@ resource "aws_s3_object" "assets" {
   key           = "assets/${each.value}"
   source        = "${var.assets_path}/${each.value}"
   source_hash   = filemd5("${var.assets_path}/${each.value}")
-  cache_control = length(regexall(".*(_next).*$", each.value)) > 0 ? "public,max-age=31536000,immutable" : "public,max-age=0,s-maxage=31536000,must-revalidate"
+  cache_control = length(regexall(".*(_next).*$", each.value)) > 0 ? "public,max-age=31536000,immutable" : var.static_asset_cache_config
   content_type  = lookup(local.content_type_lookup, split(".", each.value)[length(split(".", each.value)) - 1], "text/plain")
 }
 

modules/opennext-assets/variables.tf

@@ -24,6 +24,11 @@ variable "cache_path" {
   description = "The path of the open-next cache"
 }
 
+variable "static_asset_cache_config" {
+  type        = string
+  description = "Static asset cache config"
+}
+
 variable "server_function_role_arn" {
   type        = string
   description = "The IAM role ARN of the Next.js server lambda function"

variables.tf

@@ -44,6 +44,15 @@ variable "evaluate_target_health" {
   description = "Allow Route53 to determine whether to respond to DNS queries by checking the health of the record set"
 }
 
+/**
+ * OpenNext Assets variables
+**/
+variable "static_asset_cache_config" {
+  type        = string
+  description = "Static asset cache config"
+  default     = "public,max-age=0,s-maxage=31536000,must-revalidate"
+}
+
 /**
  * OpenNext Variables
  **/