1 files changed, 79 insertions, 0 deletions
diff --git a/util/discohelper.lua b/util/discohelper.lua
new file mode 100644
index 00000000..4ac8f227
--- /dev/null
+++ b/util/discohelper.lua
@@ -0,0 +1,79 @@
+
+local t_insert = table.insert;
+local jid_split = require "util.jid".split;
+local ipairs = ipairs;
+local st = require "util.stanza";
+
+module "discohelper";
+
+local function addDiscoItemsHandler(self, jid, func)
+	if self.item_handlers[jid] then
+		t_insert(self.item_handlers[jid], func);
+	else
+		self.item_handlers[jid] = {func};
+	end
+end
+
+local function addDiscoInfoHandler(self, jid, func)
+	if self.info_handlers[jid] then
+		t_insert(self.info_handlers[jid], func);
+	else
+		self.info_handlers[jid] = {func};
+	end
+end
+
+local function handle(self, stanza)
+	if stanza.name == "iq" and stanza.tags[1].name == "query" then
+		local query = stanza.tags[1];
+		local to = stanza.attr.to;
+		local from = stanza.attr.from
+		local node = query.attr.node or "";
+		local to_node, to_host = jid_split(to);
+
+		local reply = st.reply(stanza):query(query.attr.xmlns);
+		local handlers;
+		if query.attr.xmlns == "http://jabber.org/protocol/disco#info" then -- select handler set
+			handlers = self.info_handlers;
+		elseif query.attr.xmlns == "http://jabber.org/protocol/disco#items" then
+			handlers = self.item_handlers;
+		end
+		local handler = handlers[to]; -- get the handler
+		if not handler then -- if not found then use default handler
+			if to_node then
+				handler = handlers["*defaultnode"];
+			else
+				handler = handlers["*defaulthost"];
+			end
+		end
+		local found; -- to keep track of any handlers found
+		if handler then
+			for _, h in ipairs(handler) do
+				if h(reply, to, from, node) then found = true; end
+			end
+		end
+		if to_node then -- handlers which get called always
+			handler = handlers["*node"];
+		else
+			handler = handlers["*host"];
+		end
+		if handler then -- call always called handler
+			for _, h in ipairs(handler) do
+				if h(reply, to, from, node) then found = true; end
+			end
+		end
+		if found then return reply; end -- return the reply if there was one
+		return st.error_reply(stanza, "cancel", "service-unavailable");
+	end
+end
+
+function new()
+	return {
+		item_handlers = {};
+		info_handlers = {};
+		addDiscoItemsHandler = addDiscoItemsHandler;
+		addDiscoInfoHandler = addDiscoInfoHandler;
+		handle = handle;
+	};
+end
+
+return _M;