util.pubsub: Allow setting a callback for validating items to be published

1 files changed, 4 insertions, 0 deletions

diff --git a/util/pubsub.lua b/util/pubsub.lua
index 0370bae2..3a00aae5 100644
--- a/util/pubsub.lua
+++ b/util/pubsub.lua
@@ -6,6 +6,7 @@ local service_mt = {};
 local default_config = {
 	itemstore = function (config, _) return cache.new(config["max_items"]) end;
 	broadcaster = function () end;
+	itemcheck = function () return true; end;
 	get_affiliation = function () end;
 	capabilities = {};
 };
@@ -306,6 +307,9 @@ function service:publish(node, actor, id, item)
 		end
 		node_obj = self.nodes[node];
 	end
+	if not self.config.itemcheck(item) then
+		return nil, "internal-server-error";
+	end
 	local node_data = self.data[node];
 	local ok = node_data:set(id, item);
 	if not ok then