fix ui

cmd/paste/cors.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"net/http"
+
+	"sour.is/x/toolbox/httpsrv"
+	"sour.is/x/toolbox/ident"
+)
+
+func init() {
+	httpsrv.NewMiddleware("cors", doCORS).
+		Register(httpsrv.EventPreAuth)
+}
+
+func doCORS(_ string, w httpsrv.ResponseWriter, r *http.Request, _ ident.Ident) bool {
+	origin := r.Header.Get("origin")
+	headers := r.Header.Get("access-control-request-headers")
+
+	if origin != "" {
+		w.Header().Add("access-control-allow-origin", origin)
+	}
+
+	w.Header().Add("access-control-allow-methods", "GET, POST, PUT, DELETE, OPTIONS")
+	w.Header().Add("access-control-allow-credentials", "true")
+	w.Header().Add("access-control-max-age", "3600")
+	if headers != "" {
+		w.Header().Add("access-control-allow-headers", headers)
+	}
+
+	if r.Method == "OPTIONS" {
+		return false
+	}
+
+	return true
+}