wip

Co-authored-by: Andrea Gottardo <andrea@tailscale.com>

mdm/mdm.go

@@ -0,0 +1,50 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Package mdm contains functions to read platform-specific MDM-enforced flags
+// in a platform-independent manner.
+package mdm
+
+import (
+	"errors"
+	"sync/atomic"
+)
+
+type MDMHandler struct {
+	Settings MDMSettings
+}
+
+var mdmHandler atomic.Value // of MDMHandler type
+
+// MDMSettings gets MDM settings from device.
+type MDMSettings interface {
+	// ReadBool returns a boolean whether the given MDM key exists or not on device settings.
+	ReadBool(key string) (bool, error)
+	// ReadString reads the MDM settings value string given the key.
+	ReadString(key string) (string, error)
+}
+
+func RegisterMDMSettings(settings MDMSettings) *MDMHandler {
+	if e, ok := mdmHandler.Load().(*MDMHandler); ok {
+		return e
+	}
+	e := &MDMHandler{Settings: settings}
+	mdmHandler.Store(e)
+	return e
+}
+
+func ReadBool(key string) (bool, error) {
+	h := mdmHandler.Load().(*MDMHandler)
+	if h == nil {
+		return false, errors.New("nil handler")
+	}
+	return h.Settings.ReadBool(key)
+}
+
+func ReadString(key string) (string, error) {
+	h := mdmHandler.Load().(*MDMHandler)
+	if h == nil {
+		return "", errors.New("nil handler")
+	}
+	return h.Settings.ReadString(key)
+}