Add vless encryption

common/vision/hook.go

@@ -0,0 +1,25 @@
+package vision
+
+import (
+	"context"
+	"net"
+)
+
+type Hook func(net.Conn)
+
+type hookKey struct{}
+
+func WithHook(ctx context.Context, hook Hook) context.Context {
+	if hook == nil {
+		return ctx
+	}
+	return context.WithValue(ctx, hookKey{}, hook)
+}
+
+func HookFromContext(ctx context.Context) (Hook, bool) {
+	if ctx == nil {
+		return nil, false
+	}
+	hook, ok := ctx.Value(hookKey{}).(Hook)
+	return hook, ok
+}