fix(enhanced_auth): fix bug when "conn_props = undefined"

src/emqx_channel.erl

@@ -1189,7 +1189,7 @@ enhanced_auth(?CONNECT_PACKET(#mqtt_packet_connect{
     end;
 
 enhanced_auth(?AUTH_PACKET(_ReasonCode, Properties), Channel = #channel{conninfo = ConnInfo}) ->
-    AuthMethod = maps:get('Authentication-Method', maps:get(conn_props, ConnInfo), undefined),
+    AuthMethod = emqx_mqtt_props:get('Authentication-Method', emqx_mqtt_props:get(conn_props, ConnInfo, #{}), undefined),
     NAuthMethod = emqx_mqtt_props:get('Authentication-Method', Properties, undefined),
     AuthData = emqx_mqtt_props:get('Authentication-Data', Properties, undefined),
     case NAuthMethod =:= undefined orelse NAuthMethod =/= AuthMethod of

test/emqx_channel_SUITE.erl

@@ -152,6 +152,8 @@ t_handle_in_re_auth(_) ->
                 },
     {ok, [{outgoing, ?DISCONNECT_PACKET(?RC_BAD_AUTHENTICATION_METHOD)}, {close, bad_authentication_method}], _} =
         emqx_channel:handle_in(?AUTH_PACKET(?RC_RE_AUTHENTICATE,Properties), channel()),
+    {ok, [{outgoing, ?DISCONNECT_PACKET(?RC_BAD_AUTHENTICATION_METHOD)}, {close, bad_authentication_method}], _} =
+        emqx_channel:handle_in(?AUTH_PACKET(?RC_RE_AUTHENTICATE,Properties), channel(#{conninfo => #{proto_ver => ?MQTT_PROTO_V5, conn_props => undefined}})),
     {ok, [{outgoing, ?DISCONNECT_PACKET(?RC_NOT_AUTHORIZED)}, {close, not_authorized}], _} =
         emqx_channel:handle_in(?AUTH_PACKET(?RC_RE_AUTHENTICATE,Properties), channel(#{conninfo => #{proto_ver => ?MQTT_PROTO_V5, conn_props => Properties}})).