From a827a6e91bf981f794b3d74ff5cfd651810e3874 Mon Sep 17 00:00:00 2001
From: Joerg Lehmann <joerg.lehmann@nbit.ch>
Date: Sun, 2 Oct 2022 16:19:12 +0200
Subject: [PATCH] add some validation code

---
 persistence.go | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/persistence.go b/persistence.go
index e8827f1..045da29 100644
--- a/persistence.go
+++ b/persistence.go
@@ -119,15 +119,14 @@ func checkUserAvailable(username string) bool {
 	conn := globalPool.Get()
 	defer conn.Close()
 
-	_, err := conn.Do("HGETALL", userPrefix+username)
-	if err == redis.ErrNil {
-		logit("User does not exist and is therefore available:" + username)
+	exists, _ := redis.Bool(conn.Do("EXISTS", userPrefix+username))
+	if !exists {
+		logit("checkUserAvailable: User does not exist, so it is available: " + username)
 		return true
-	} else if err != nil {
-		logit("checkUserAvailable: Error to query Key Value Store")
+	} else {
+		logit("checkUserAvailable: User exist, so it is not available: " + username)
 		return false
 	}
-	return false
 }
 
 func getMyDevs(username string) []string {
@@ -363,10 +362,10 @@ func updateUser(username, password string) {
 	defer conn.Close()
 	logit("updateUser: " + username)
 
-        // we exit if user does not exit
+	// we exit if user does not exit
 	exists, _ := redis.Bool(conn.Do("EXISTS", userPrefix+username))
 	if !exists {
-	        logit("updateUser: User does not exist: " + username)
+		logit("updateUser: User does not exist: " + username)
 		return
 	}