From 12c9f95eb112e67b48dd5ca1b90926f20f09a411 Mon Sep 17 00:00:00 2001
From: Pierre-Alain TORET <pierre-alain.toret@protonmail.com>
Date: Thu, 20 Sep 2018 10:12:35 +0200
Subject: [PATCH] middleware/clientapproval : add error when using blacklist
 and whitelist at the same time

---
 middleware/clientapproval/clientapproval.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/middleware/clientapproval/clientapproval.go b/middleware/clientapproval/clientapproval.go
index aaddc7c..7f1af1b 100644
--- a/middleware/clientapproval/clientapproval.go
+++ b/middleware/clientapproval/clientapproval.go
@@ -56,6 +56,10 @@ func NewHook(cfg Config) (middleware.Hook, error) {
 		unapproved: make(map[bittorrent.ClientID]struct{}),
 	}
 
+	if len(cfg.Whitelist) > 0 && len(cfg.Blacklist) > 0 {
+		return nil, fmt.Errorf("using both whitelist and blacklist is invalid")
+	}
+
 	for _, cidString := range cfg.Whitelist {
 		cidBytes := []byte(cidString)
 		if len(cidBytes) != 6 {