# HG changeset patch
# User Matthew Wild <mwild1@gmail.com>
# Date 1408964632 -3600
# Node ID 02cd4a081db44e4bbae8ced0d7ce4918064da9c4
# Parent  d5e8758d391d28d9925fd4ef3b3151524fd82970
mod_filter_chatstates: Replace unwanted messages with a dummy stanza so that mod_message doesn't think delivery failed (and then generate an error reply)

diff -r d5e8758d391d -r 02cd4a081db4 mod_filter_chatstates/mod_filter_chatstates.lua
--- a/mod_filter_chatstates/mod_filter_chatstates.lua	Mon Aug 25 00:38:14 2014 +0200
+++ b/mod_filter_chatstates/mod_filter_chatstates.lua	Mon Aug 25 12:03:52 2014 +0100
@@ -1,6 +1,9 @@
 local filters = require "util.filters";
 local st = require "util.stanza";
 
+local dummy_stanza_mt = setmetatable({ __tostring = function () return ""; end }, { __index = st.stanza_mt });
+local dummy_stanza = setmetatable(st.stanza(), dummy_stanza_mt);
+
 module:depends("csi");
 
 local function filter_chatstates(stanza)
@@ -8,11 +11,11 @@
 		stanza = st.clone(stanza);
 		stanza:maptags(function (tag)
 			if tag.attr.xmlns ~= "http://jabber.org/protocol/chatstates" then
-				return tag
+				return tag;
 			end
 		end);
 		if #stanza.tags == 0 then
-			return nil;
+			return dummy_stanza;
 		end
 	end
 	return stanza;