-- 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 tonumber = tonumber;

local pairs, ipairs = pairs, ipairs;

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:hook("iq/self/jabber:iq:roster:query", function(event)

	local session, stanza = event.origin, event.stanza;

	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, item in pairs(session.roster) do

				if jid ~= "pending" and jid then

					roster:tag("item", {

						jid = jid,

						subscription = item.subscription,

						ask = item.ask,

						name = item.name,

					});

					for group in pairs(item.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

	else -- stanza.attr.type == "set"

		local query = stanza.tags[1];

		if #query.tags == 1 and query.tags[1].name == "item"

				-- 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

							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

	end

	return true;

end);