plugins/mod_roster.lua

-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
-- 
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--


local st = require "util.stanza"

local jid_split = require "util.jid".split;
local jid_prep = require "util.jid".prep;
local t_concat = table.concat;
local tostring = tostring;

local rm_remove_from_roster = require "core.rostermanager".remove_from_roster;
local rm_add_to_roster = require "core.rostermanager".add_to_roster;
local rm_roster_push = require "core.rostermanager".roster_push;
local core_post_stanza = core_post_stanza;

module:add_feature("jabber:iq:roster");

local rosterver_stream_feature = st.stanza("ver", {xmlns="urn:xmpp:features:rosterver"}):tag("optional"):up();
module:hook("stream-features", function(event)
	local origin, features = event.origin, event.features;
	if origin.username then
		features:add_child(rosterver_stream_feature);
	end
end);

module:add_iq_handler("c2s", "jabber:iq:roster", 
		function (session, stanza)
			if stanza.tags[1].name == "query" then
				if stanza.attr.type == "get" then
					local roster = st.reply(stanza);
					
					local client_ver = tonumber(stanza.tags[1].attr.ver);
					local server_ver = tonumber(session.roster[false].version or 1);
					
					if not (client_ver and server_ver) or client_ver ~= server_ver then
						roster:query("jabber:iq:roster");
						-- Client does not support versioning, or has stale roster
						for jid in pairs(session.roster) do
							if jid ~= "pending" and jid then
								roster:tag("item", {
									jid = jid,
									subscription = session.roster[jid].subscription,
									ask = session.roster[jid].ask,
									name = session.roster[jid].name,
								});
								for group in pairs(session.roster[jid].groups) do
									roster:tag("group"):text(group):up();
								end
								roster:up(); -- move out from item
							end
						end
						roster.tags[1].attr.ver = server_ver;
					end
					session.send(roster);
					session.interested = true; -- resource is interested in roster updates
					return true;
				elseif stanza.attr.type == "set" then
					local query = stanza.tags[1];
					if #query.tags == 1 and query.tags[1].name == "item"
							and query.tags[1].attr.xmlns == "jabber:iq:roster" and query.tags[1].attr.jid 
							-- Protection against overwriting roster.pending, until we move it
							and query.tags[1].attr.jid ~= "pending" then
						local item = query.tags[1];
						local from_node, from_host = jid_split(stanza.attr.from);
						local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
						local jid = jid_prep(item.attr.jid);
						local node, host, resource = jid_split(jid);
						if not resource and host then
							if jid ~= from_node.."@"..from_host then
								if item.attr.subscription == "remove" then
									local roster = session.roster;
									local r_item = roster[jid];
									if r_item then
										local to_bare = node and (node.."@"..host) or host; -- bare JID
										if r_item.subscription == "both" or r_item.subscription == "from" or (roster.pending and roster.pending[jid]) then
											core_post_stanza(session, st.presence({type="unsubscribed", from=session.full_jid, to=to_bare}));
										end
										if r_item.subscription == "both" or r_item.subscription == "to" or r_item.ask then
											core_post_stanza(session, st.presence({type="unsubscribe", from=session.full_jid, to=to_bare}));
										end
										local success, err_type, err_cond, err_msg = rm_remove_from_roster(session, jid);
										if success then
											session.send(st.reply(stanza));
											rm_roster_push(from_node, from_host, jid);
										else
											session.send(st.error_reply(stanza, err_type, err_cond, err_msg));
										end
									else
										session.send(st.error_reply(stanza, "modify", "item-not-found"));
									end
								else
									local r_item = {name = item.attr.name, groups = {}};
									if r_item.name == "" then r_item.name = nil; end
									if session.roster[jid] then
										r_item.subscription = session.roster[jid].subscription;
										r_item.ask = session.roster[jid].ask;
									else
										r_item.subscription = "none";
									end
									for _, child in ipairs(item) do	
										if child.name == "group" then
											local text = t_concat(child);
											if text and text ~= "" then
												r_item.groups[text] = true;
											end
										end
									end
									local success, err_type, err_cond, err_msg = rm_add_to_roster(session, jid, r_item);
									if success then
										-- Ok, send success
										session.send(st.reply(stanza));
										-- and push change to all resources
										rm_roster_push(from_node, from_host, jid);
									else
										-- Adding to roster failed
										session.send(st.error_reply(stanza, err_type, err_cond, err_msg));
									end
								end
							else
								-- Trying to add self to roster
								session.send(st.error_reply(stanza, "cancel", "not-allowed"));
							end
						else
							-- Invalid JID added to roster
							session.send(st.error_reply(stanza, "modify", "bad-request")); -- FIXME what's the correct error?
						end
					else
						-- Roster set didn't include a single item, or its name wasn't  'item'
						session.send(st.error_reply(stanza, "modify", "bad-request"));
					end
					return true;
				end
			end
		end);