-- 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.

--

-- Exposed functions:

--

-- create_room(jid) -> room

-- track_room(room)

-- delete_room(room)

-- forget_room(room)

-- get_room_from_jid(jid) -> room

-- each_room(live_only) -> () -> room [DEPRECATED]

-- all_rooms() -> room

-- live_rooms() -> room

-- shutdown_component()

if module:get_host_type() ~= "component" then

	error("MUC should be loaded as a component, please see https://prosody.im/doc/components", 0);

end

local muclib = module:require "muc";

room_mt = muclib.room_mt; -- Yes, global.

new_room = muclib.new_room;

local name = module:require "muc/name";

room_mt.get_name = name.get;

room_mt.set_name = name.set;

local description = module:require "muc/description";

room_mt.get_description = description.get;

room_mt.set_description = description.set;

local language = module:require "muc/language";

room_mt.get_language = language.get;

room_mt.set_language = language.set;

local hidden = module:require "muc/hidden";

room_mt.get_hidden = hidden.get;

room_mt.set_hidden = hidden.set;

function room_mt:get_public()

	return not self:get_hidden();

end

function room_mt:set_public(public)

	return self:set_hidden(not public);

end

local password = module:require "muc/password";

room_mt.get_password = password.get;

room_mt.set_password = password.set;

local members_only = module:require "muc/members_only";

room_mt.get_members_only = members_only.get;

room_mt.set_members_only = members_only.set;

room_mt.get_allow_member_invites = members_only.get_allow_member_invites;

room_mt.set_allow_member_invites = members_only.set_allow_member_invites;

local moderated = module:require "muc/moderated";

room_mt.get_moderated = moderated.get;

room_mt.set_moderated = moderated.set;

local request = module:require "muc/request";

room_mt.handle_role_request = request.handle_request;

local persistent = module:require "muc/persistent";

room_mt.get_persistent = persistent.get;

room_mt.set_persistent = persistent.set;

local subject = module:require "muc/subject";

room_mt.get_changesubject = subject.get_changesubject;

room_mt.set_changesubject = subject.set_changesubject;

room_mt.get_subject = subject.get;

room_mt.set_subject = subject.set;

room_mt.send_subject = subject.send;

local history = module:require "muc/history";

room_mt.send_history = history.send;

room_mt.get_historylength = history.get_length;

room_mt.set_historylength = history.set_length;

local jid_split = require "util.jid".split;

local jid_bare = require "util.jid".bare;

local st = require "util.stanza";

local cache = require "util.cache";

local um_is_admin = require "core.usermanager".is_admin;

module:require "muc/config_form_sections";

module:depends("disco");

module:add_identity("conference", "text", module:get_option_string("name", "Prosody Chatrooms"));

module:add_feature("http://jabber.org/protocol/muc");

module:depends "muc_unique"

module:require "muc/lock";

local function is_admin(jid)

	return um_is_admin(jid, module.host);

end

do -- Monkey patch to make server admins room owners

	local _get_affiliation = room_mt.get_affiliation;

	function room_mt:get_affiliation(jid)

		if is_admin(jid) then return "owner"; end

		return _get_affiliation(self, jid);

	end

	local _set_affiliation = room_mt.set_affiliation;

	function room_mt:set_affiliation(actor, jid, affiliation, reason)

		if affiliation ~= "owner" and is_admin(jid) then return nil, "modify", "not-acceptable"; end

		return _set_affiliation(self, actor, jid, affiliation, reason);

	end

end

local persistent_rooms_storage = module:open_store("persistent");

local persistent_rooms = module:open_store("persistent", "map");

local room_configs = module:open_store("config");

local room_state = module:open_store("state");

local room_items_cache = {};

local function room_save(room, forced, savestate)

	local node = jid_split(room.jid);

	local is_persistent = persistent.get(room);

	room_items_cache[room.jid] = room:get_public() and room:get_name() or nil;

	if is_persistent or savestate then

		persistent_rooms:set(nil, room.jid, true);

		local data, state = room:freeze(savestate);

		room_state:set(node, state);

		return room_configs:set(node, data);

	elseif forced then

		persistent_rooms:set(nil, room.jid, nil);

		room_state:set(node, nil);

		return room_configs:set(node, nil);

	end

end

local max_rooms = module:get_option_number("muc_max_rooms");

local max_live_rooms = module:get_option_number("muc_room_cache_size", 100);

local room_hit = module:measure("room_hit", "rate");

local room_miss = module:measure("room_miss", "rate")

local room_eviction = module:measure("room_eviction", "rate");

local rooms = cache.new(max_rooms or max_live_rooms, function (jid, room)

	if max_rooms then

		module:log("info", "Room limit of %d reached, no new rooms allowed");

		return false;

	end

	module:log("debug", "Evicting room %s", jid);

	room_eviction();

	room_items_cache[room.jid] = room:get_public() and room:get_name() or nil;

	local ok, err = room_save(room, nil, true); -- Force to disk

	if not ok then

		module:log("error", "Failed to swap inactive room %s to disk: %s", jid, err);

		return false;

	end

end);

-- Automatically destroy empty non-persistent rooms

module:hook("muc-occupant-left",function(event)

	local room = event.room

	if room.destroying then return end

	if not room:has_occupant() and not persistent.get(room) then -- empty, non-persistent room

		module:log("debug", "%q empty, destroying", room.jid);

		module:fire_event("muc-room-destroyed", { room = room });

	end

end, -1);

function track_room(room)

	if rooms:set(room.jid, room) then

		-- When room is created, over-ride 'save' method

		room.save = room_save;

		return room;

	end

	-- Resource limit reached

	return false;

end

local function handle_broken_room(room, origin, stanza)

	module:log("debug", "Returning error from broken room %s", room.jid);

	origin.send(st.error_reply(stanza, "wait", "internal-server-error"));

	return true;

end

local function restore_room(jid)

	local node = jid_split(jid);

	local data, err = room_configs:get(node);

	if data then

		module:log("debug", "Restoring room %s from storage", jid);

		if module:fire_event("muc-room-pre-restore", { jid = jid, data = data }) == false then

			return false;

		end

		local state, s_err = room_state:get(node);

		if not state and s_err then

			module:log("debug", "Could not restore state of room %s: %s", jid, s_err);

		end

		local room = muclib.restore_room(data, state);

		if track_room(room) then

			room_state:set(node, nil);

			module:fire_event("muc-room-restored", { jid = jid, room = room });

			return room;

		else

			return false;

		end

	elseif err then

		module:log("error", "Error restoring room %s from storage: %s", jid, err);

		local room = muclib.new_room(jid, { locked = math.huge });

		room.handle_normal_presence = handle_broken_room;

		room.handle_first_presence = handle_broken_room;

		return room;

	end

end

-- Removes a room from memory, without saving it (save first if required)

function forget_room(room)

	module:log("debug", "Forgetting %s", room.jid);

	rooms.save = nil;

	rooms:set(room.jid, nil);

end

-- Removes a room from the database (may remain in memory)

function delete_room(room)

	module:log("debug", "Deleting %s", room.jid);

	room_configs:set(jid_split(room.jid), nil);

	room_state:set(jid_split(room.jid), nil);

	persistent_rooms:set(nil, room.jid, nil);

	room_items_cache[room.jid] = nil;

end

function module.unload()

	for room in live_rooms() do

		room:save(nil, true);

		forget_room(room);

	end

end

function get_room_from_jid(room_jid)

	local room = rooms:get(room_jid);

	if room then

		room_hit();

		rooms:set(room_jid, room); -- bump to top;

		return room;

	end

	room_miss();

	return restore_room(room_jid);

end

function create_room(room_jid, config)

	local exists = get_room_from_jid(room_jid);

	if exists then

		return nil, "room-exists";

	end

	local room = muclib.new_room(room_jid, config);

	module:fire_event("muc-room-created", {

		room = room;

	});

	return track_room(room);

end

function all_rooms()

	return coroutine.wrap(function ()

		local seen = {}; -- Don't iterate over persistent rooms twice

		for room in live_rooms() do

			coroutine.yield(room);

			seen[room.jid] = true;

		end

		local all_persistent_rooms, err = persistent_rooms_storage:get(nil);

		if not all_persistent_rooms then

			if err then

				module:log("error", "Error loading list of persistent rooms, only rooms live in memory were iterated over");

				module:log("debug", "%s", debug.traceback(err));

			end

			return nil;

		end

		for room_jid in pairs(all_persistent_rooms) do

			if not seen[room_jid] then

				local room = restore_room(room_jid);

				if room then

					coroutine.yield(room);

				else

					module:log("error", "Missing data for room '%s', omitting from iteration", room_jid);

				end

			end

		end

	end);

end

function live_rooms()

	return rooms:values();

end

function each_room(live_only)

	if live_only then

		return live_rooms();

	end

	return all_rooms();

end

module:hook("host-disco-items", function(event)

	local reply = event.reply;

	module:log("debug", "host-disco-items called");

	if next(room_items_cache) ~= nil then

		for jid, room_name in pairs(room_items_cache) do

			reply:tag("item", { jid = jid, name = room_name }):up();

		end

	else

		for room in all_rooms() do

			if not room:get_hidden() then

				local jid, room_name = room.jid, room:get_name();

				room_items_cache[jid] = room_name;

				reply:tag("item", { jid = jid, name = room_name }):up();

			end

		end

	end

end);

module:hook("muc-room-pre-create", function (event)

	local room = event.room;

	room:set_public(module:get_option_boolean("muc_room_default_public", false));

	room:set_persistent(module:get_option_boolean("muc_room_default_persistent", room:get_persistent()));

	room:set_members_only(module:get_option_boolean("muc_room_default_members_only", room:get_members_only()));

	room:set_moderated(module:get_option_boolean("muc_room_default_moderated", room:get_moderated()));

	room:set_changesubject(module:get_option_boolean("muc_room_default_change_subject", room:get_changesubject()));

	room:set_historylength(module:get_option_number("muc_room_default_history_length", room:get_historylength()));

	room:set_language(event.stanza.attr["xml:lang"] or module:get_option_string("muc_room_default_language"));

end, 1);

module:hook("muc-room-pre-create", function(event)

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

	if not track_room(event.room) then

		origin.send(st.error_reply(stanza, "wait", "resource-constraint"));

		return true;

	end

end, -1000);

module:hook("muc-room-destroyed",function(event)

	local room = event.room;

	forget_room(room);

	delete_room(room);

end);

if module:get_option_boolean("muc_tombstones", true) then

	local ttl = module:get_option_number("muc_tombstone_expiry", 86400 * 31);

	module:hook("muc-room-destroyed",function(event)

		local room = event.room;

		if not room:get_persistent() then return end

		local tombstone = new_room(room.jid, {

			locked = os.time() + ttl;

			destroyed = true;

			reason = event.reason;

			newjid = event.newjid;