Diff

--- a/plugins/mod_pubsub/pubsub.lib.lua	Sun Aug 05 11:44:49 2018 +0200
+++ b/plugins/mod_pubsub/pubsub.lib.lua	Mon Aug 06 08:21:55 2018 +0100
@@ -642,18 +642,12 @@
 		return true;
 	end
 
-	if not service:may(node, stanza.attr.from, "configure") then
-		origin.send(pubsub_error_reply(stanza, "forbidden"));
+	local ok, node_config = service:get_node_config(node, stanza.attr.from);
+	if not ok then
+		origin.send(pubsub_error_reply(stanza, node_config));
 		return true;
 	end
 
-	local node_obj = service.nodes[node];
-	if not node_obj then
-		origin.send(pubsub_error_reply(stanza, "item-not-found"));
-		return true;
-	end
-
-	local node_config = node_obj.config;
 	local pubsub_form_data = config_to_xep0060(node_config);
 	local reply = st.reply(stanza)
 		:tag("pubsub", { xmlns = xmlns_pubsub_owner })
@@ -678,7 +672,12 @@
 		origin.send(st.error_reply(stanza, "modify", "bad-request", "Missing dataform"));
 		return true;
 	end
-	local form_data, err = node_config_form:data(config_form);
+	local ok, old_config = service:get_node_config(node, stanza.attr.from);
+	if not ok then
+		origin.send(pubsub_error_reply(stanza, old_config));
+		return true;
+	end
+	local form_data, err = node_config_form:data(config_form, old_config);
 	if not form_data then
 		origin.send(st.error_reply(stanza, "modify", "bad-request", err));
 		return true;