Add development CORS header when the "ENVIRONMENT" environment variable is set to "dev"

controller/controller.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"os"
 	"strings"
 	"time"
 
@@ -34,7 +35,10 @@ func init() {
 // Handle creates the router and starts the server
 func Handle() {
 	cfg := config.Get()
-	router := CreateRouter(cfg)
+	var router http.Handler = CreateRouter(cfg)
+	if os.Getenv("ENVIRONMENT") == "dev" {
+		router = developmentCorsHandler(router)
+	}
 	server := &http.Server{
 		Addr:         fmt.Sprintf("%s:%d", cfg.Web.Address, cfg.Web.Port),
 		Handler:      router,

controller/cors.go

@@ -0,0 +1,10 @@
+package controller
+
+import "net/http"
+
+func developmentCorsHandler(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "http://localhost:8081")
+		next.ServeHTTP(w, r)
+	})
+}