Initial QSfera import

Server/vendor/github.com/open-policy-agent/opa/v1/loader/extension/extension.go

@@ -0,0 +1,40 @@
+// Copyright 2023 The OPA Authors.  All rights reserved.
+// Use of this source code is governed by an Apache2
+// license that can be found in the LICENSE file.
+
+package extension
+
+import (
+	"sync"
+)
+
+var pluginMtx sync.Mutex
+var bundleExtensions map[string]Handler
+
+// Handler is used to unmarshal a byte slice of a registered extension
+// EXPERIMENTAL: Please don't rely on this functionality, it may go
+// away or change in the future.
+type Handler func([]byte, any) error
+
+// RegisterExtension registers a Handler for a certain file extension, including
+// the dot: ".json", not "json".
+// EXPERIMENTAL: Please don't rely on this functionality, it may go
+// away or change in the future.
+func RegisterExtension(name string, handler Handler) {
+	pluginMtx.Lock()
+	defer pluginMtx.Unlock()
+
+	if bundleExtensions == nil {
+		bundleExtensions = map[string]Handler{}
+	}
+	bundleExtensions[name] = handler
+}
+
+// FindExtension ios used to look up a registered extension Handler
+// EXPERIMENTAL: Please don't rely on this functionality, it may go
+// away or change in the future.
+func FindExtension(ext string) Handler {
+	pluginMtx.Lock()
+	defer pluginMtx.Unlock()
+	return bundleExtensions[ext]
+}