--- a/plugins/muc/muc.lib.lua	Fri Jan 29 21:08:18 2010 +0500
+++ b/plugins/muc/muc.lib.lua	Fri Jan 29 21:15:33 2010 +0500
@@ -59,19 +59,12 @@
 	["service-unavailable"] = true;
 	["malformed error"] = true;
 };
+
 local function get_error_condition(stanza)
-	for _, tag in ipairs(stanza.tags) do
-		if tag.name == "error" and (not(tag.attr.xmlns) or tag.attr.xmlns == "jabber:client") then
-			for _, cond in ipairs(tag.tags) do
-				if cond.attr.xmlns == "urn:ietf:params:xml:ns:xmpp-stanzas" then
-					return cond.name;
-				end
-			end
-			return "malformed error";
-		end
-	end
-	return "malformed error";
+	local _, condition = stanza:get_error();
+	return condition or "malformed error";
 end
+
 local function is_kickable_error(stanza)
 	local cond = get_error_condition(stanza);
 	return kickable_error_conditions[cond] and cond;
@@ -195,6 +188,16 @@
 	return true;
 end
 
+local function build_unavailable_presence_from_error(stanza)
+	local type, condition, text = stanza:get_error();
+	local error_message = "Kicked: "..condition:gsub("%-", " ");
+	if text then
+		error_message = error_message..": "..text;
+	end
+	return st.presence({type='unavailable', from=stanza.attr.from, to=stanza.attr.to})
+		:tag('status'):text(error_message);
+end
+
 function room_mt:handle_to_occupant(origin, stanza) -- PM, vCards, etc
 	local from, to = stanza.attr.from, stanza.attr.to;
 	local room = jid_bare(to);
@@ -208,8 +211,7 @@
 		if type == "error" then -- error, kick em out!
 			if current_nick then
 				log("debug", "kicking %s from %s", current_nick, room);
-				self:handle_to_occupant(origin, st.presence({type='unavailable', from=from, to=to})
-					:tag('status'):text('Kicked: '..get_error_condition(stanza))); -- send unavailable
+				self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza));
 			end
 		elseif type == "unavailable" then -- unavailable
 			if current_nick then
@@ -356,8 +358,7 @@
 		origin.send(st.error_reply(stanza, "modify", "bad-request"));
 	elseif current_nick and stanza.name == "message" and type == "error" and is_kickable_error(stanza) then
 		log("debug", "%s kicked from %s for sending an error message", current_nick, self.jid);
-		self:handle_to_occupant(origin, st.presence({type='unavailable', from=stanza.attr.from, to=stanza.attr.to})
-			:tag('status'):text('Kicked: '..get_error_condition(stanza))); -- send unavailable
+		self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza)); -- send unavailable
 	else -- private stanza
 		local o_data = self._occupants[to];
 		if o_data then
@@ -616,8 +617,7 @@
 	elseif stanza.name == "message" and type == "error" and is_kickable_error(stanza) then
 		local current_nick = self._jid_nick[stanza.attr.from];
 		log("debug", "%s kicked from %s for sending an error message", current_nick, self.jid);
-		self:handle_to_occupant(origin, st.presence({type='unavailable', from=stanza.attr.from, to=stanza.attr.to})
-			:tag('status'):text('Kicked: '..get_error_condition(stanza))); -- send unavailable
+		self:handle_to_occupant(origin, build_unavailable_presence_from_error(stanza)); -- send unavailable
 	elseif stanza.name == "presence" then -- hack - some buggy clients send presence updates to the room rather than their nick
 		local to = stanza.attr.to;
 		local current_nick = self._jid_nick[stanza.attr.from];

--- a/util/stanza.lua	Fri Jan 29 21:08:18 2010 +0500
+++ b/util/stanza.lua	Fri Jan 29 21:15:33 2010 +0500
@@ -38,6 +38,8 @@
 	end
 end
 
+local xmlns_stanzas = "urn:ietf:params:xml:ns:xmpp-stanzas";
+
 module "stanza"
 
 stanza_mt = { __type = "stanza" };
@@ -189,6 +191,30 @@
 	end
 end
 
+function stanza_mt.get_error(stanza)
+	local type, condition, text;
+	
+	local error_tag = stanza:get_child("error");
+	if not error_tag then
+		return nil, nil, nil;
+	end
+	type = error_tag.attr.type;
+	
+	for child in error_tag:children() do
+		if child.attr.xmlns == xmlns_stanzas then
+			if not text and child.name == "text" then
+				text = child:get_text();
+			elseif not condition then
+				condition = child.name;
+			end
+			if condition and text then
+				break;
+			end
+		end
+	end
+	return type, condition or "undefined-condition", text or "";
+end
+
 function stanza_mt.__add(s1, s2)
 	return s1:add_direct_child(s2);
 end