Allow lambda_function_associations to be set for ordered cache behaviors (#81)

Author: a-i-joe

variables.tf

@@ -228,7 +228,11 @@ variable "cloudfront_ordered_cache_behaviors" {
     default_ttl               = optional(number)
     field_level_encryption_id = optional(string)
     # forwarded_values will not be supported as Hashicorp had already deprecated it at the time of implementing this module
-    # TODO support lambda_function_association and function_association
+    function_association = optional(list(object({
+      event_type   = string
+      function_arn = string
+    })), [])
+    # TODO support lambda_function_association
     max_ttl                    = optional(number)
     min_ttl                    = optional(number)
     origin_request_policy_id   = string

website.tf

@@ -216,6 +216,13 @@ resource "aws_cloudfront_distribution" "website" {
       smooth_streaming           = ordered_cache_behavior.value.smooth_streaming
       target_origin_id           = ordered_cache_behavior.value.target_origin_id
       viewer_protocol_policy     = ordered_cache_behavior.value.viewer_protocol_policy
+      dynamic "function_association" {
+        for_each = ordered_cache_behavior.value.function_association
+        content {
+          event_type   = function_association.value.event_type
+          function_arn = function_association.value.function_arn
+        }
+      }
     }
   }