feat: support custom headers for amplify

Author: oycyc

README.md

@@ -1,4 +1,4 @@
-
+## THIS FORK CONTAINS THE CHANGES FOR PR 32, 33, and 46!
 
 <!-- markdownlint-disable -->
 <a href="https://cpco.io/homepage"><img src="https://github.com/cloudposse/terraform-aws-amplify-app/blob/main/.github/banner.png?raw=true" alt="Project Banner"/></a><br/>
@@ -27,7 +27,7 @@
 
 -->
 
-Terraform module to provision AWS Amplify apps, backend environments, branches, domain associations, and webhooks. 
+Terraform module to provision AWS Amplify apps, backend environments, branches, domain associations, and webhooks.
 
 
 > [!TIP]

main.tf

@@ -25,6 +25,7 @@ resource "aws_amplify_app" "default" {
   enable_basic_auth             = var.enable_basic_auth
   enable_branch_auto_build      = var.enable_branch_auto_build
   environment_variables         = var.environment_variables
+  custom_headers                = var.custom_headers
 
   iam_service_role_arn = local.iam_service_role_arn
 

variables.tf

@@ -148,6 +148,12 @@ variable "custom_rules" {
   nullable    = false
 }
 
+variable "custom_headers" {
+  type        = string
+  description = "The custom headers for the Amplify app, allows specifying headers for every HTTP response. Must adhere to AWS's format: https://docs.aws.amazon.com/amplify/latest/userguide/custom-headers.html"
+  default     = ""
+}
+
 variable "environments" {
   type = map(object({
     branch_name                   = optional(string)