package middleware

import "net/http"

// CORS wraps next with permissive CORS headers and short-circuits OPTIONS preflight.
//
// This service is meant to sit behind an authenticated gateway, so we set
// "Access-Control-Allow-Origin: *". Tighten this if you deploy elsewhere.
func CORS(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Access-Control-Allow-Origin", "*")
		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, DELETE, OPTIONS")
		w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
		if r.Method == http.MethodOptions {
			w.WriteHeader(http.StatusNoContent)
			return
		}
		next.ServeHTTP(w, r)
	})
}