Adding middleware to duct apis

config.edn

.......
:todo-api.middleware/wrap-cors
  {:access-control-allow-origin [#todo-api/regex ".*"]
   :access-control-allow-methods [:get :put :post :delete]}

  :duct.handler/root
  {:middleware [#ig/ref :todo-api.middleware/wrap-cors]}
........

dev.clj

;; dev/src/dev.clj
(ns dev
  (:refer-clojure :exclude [test])
  (:require [clojure.repl :refer :all]
            [fipp.edn :refer [pprint]]
            [clojure.tools.namespace.repl :refer [refresh]]
            [clojure.java.io :as io]
            [duct.core :as duct]
            [duct.core.repl :as duct-repl]
            [eftest.runner :as eftest]
            [integrant.core :as ig]
            [integrant.repl :refer [clear halt go init prep]]
            [integrant.repl.state :refer [config system]]
            [ragtime.jdbc]
            [ragtime.repl]
            [orchestra.spec.test :as stest]
            [todo-api.main :refer [custom-readers]])) ;;this

(duct/load-hierarchy)

(defn read-config []
  (duct/read-config (io/resource "todo_api/config.edn")
                    custom-readers)) ;;this

main.cljs

(ns todo-api.main
  (:gen-class)
  (:require [duct.core :as duct]))

(duct/load-hierarchy)

(def custom-readers ;; this
  {'todo-api/regex re-pattern}) ;; this

(defn -main [& args]
  (let [keys     (or (duct/parse-keys args) [:duct/daemon])
        profiles [:duct.profile/prod]]
    (-> (duct/resource "todo_api/config.edn")
        (duct/read-config custom-readers) ;;this
        (duct/exec-config profiles keys))))

middleware.clj

(ns todo-api.middleware
  (:require [integrant.core :as ig]
            [ring.middleware.cors :refer [wrap-cors]]))

(defmethod ig/init-key ::wrap-cors [_ config]
  #(apply wrap-cors % (apply concat config)))