Better handle missing usernames. Fix test.

src/Authorizer.cpp

@@ -46,7 +46,7 @@ void Authorizer::add_unknown(const std::string& username)
 
 bool Authorizer::is_unknown(const std::string& username)
 {
-    return _unknownList.confirm(username);
+    return (username.empty() or _unknownList.confirm(username));
 }
 
 bool Authorizer::add(const std::string& token, const std::string& username)

src/jwp-plugin.cpp

@@ -102,7 +102,13 @@ int jwp_auth_basic_auth_callback(int event, void *event_data, void *userdata)
 
     struct mosquitto_evt_basic_auth *auth_data = static_cast<struct mosquitto_evt_basic_auth*>(event_data);
 
-    if(!auth_data->username or !auth_data->password)
+    if(!auth_data->username)
+    {
+        // We need a username to do anything.
+        return MOSQ_ERR_PLUGIN_DEFER;
+    }
+
+    if(!auth_data->password)
     {
         authorizer->add_unknown(std::string(auth_data->username));
         return MOSQ_ERR_PLUGIN_DEFER;

test/run.sh

@@ -1,2 +1,2 @@
 #!/usr/bin/env bash
-/usr/local/sbin/mosquitto -v -c $PWD/mosquitto.conf
+/usr/sbin/mosquitto -v -c $PWD/mosquitto.conf