move load restrictions

api/types/pluginrestrictions.go

@@ -0,0 +1,28 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package types
+
+// Some plugin classes
+// - builtin: plugins defined in the kustomize repo.
+//   May be freely used and re-configured.
+// - local: plugins that aren't builtin but are
+//   locally defined (presumably by the user), meaning
+//   the kustomization refers to them via a relative
+//   file path, not a URL.
+// - remote: require a build-time download to obtain.
+//   Unadvised, unless one controls the
+//   serving site.
+//
+//go:generate stringer -type=PluginRestrictions
+type PluginRestrictions int
+
+const (
+	PluginRestrictionsUnknown PluginRestrictions = iota
+
+	// Non-builtin plugins completely disabled.
+	PluginRestrictionsBuiltinsOnly
+
+	// No restrictions, do whatever you want.
+	PluginRestrictionsNone
+)