File

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−-- Based on code from mod_muc_restrict_pm in prosody-modules@d82c0383106a
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−-- by Nicholas George <wirlaburla@worlio.com>
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−
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−local st = require "util.stanza";
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−local muc_util = module:require "muc/util";
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−local valid_roles = muc_util.valid_roles;
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−
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−-- COMPAT w/ prosody-modules allow_pm
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−local compat_map = {
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−	everyone = "visitor";
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−	participants = "participant";
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−	moderators = "moderator";
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−	members = "affiliated";
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−};
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−
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−local function get_allow_pm(room)
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−	local val = room._data.allow_pm;
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−	return compat_map[val] or val or "visitor";
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−end
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−
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−local function set_allow_pm(room, val)
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−	if get_allow_pm(room) == val then return false; end
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−	room._data.allow_pm = val;
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−	return true;
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−end
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−
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−local function get_allow_modpm(room)
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−	return room._data.allow_modpm or false;
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−end
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−
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−local function set_allow_modpm(room, val)
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−	if get_allow_modpm(room) == val then return false; end
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−	room._data.allow_modpm = val;
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−	return true;
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−end
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−
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−module:hook("muc-config-form", function(event)
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−	local pmval = get_allow_pm(event.room);
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−	table.insert(event.form, {
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−		name = 'muc#roomconfig_allowpm';
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−		type = 'list-single';
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−		label = 'Allow private messages from';
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−		options = {
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−			{ value = 'visitor', label = 'Everyone', default = pmval == 'visitor' };
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−			{ value = 'participant', label = 'Participants', default = pmval == 'participant' };
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−			{ value = 'moderator', label = 'Moderators', default = pmval == 'moderator' };
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−			{ value = 'affiliated', label = "Members", default = pmval == "affiliated" };
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−			{ value = 'none', label = 'No one', default = pmval == 'none' };
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−		}
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−	});
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−	table.insert(event.form, {
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−		name = '{xmpp:prosody.im}muc#allow_modpm';
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−		type = 'boolean';
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−		label = 'Always allow private messages to moderators';
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−		value = get_allow_modpm(event.room)
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−	});
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−end);
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−
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−module:hook("muc-config-submitted/muc#roomconfig_allowpm", function(event)
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−	if set_allow_pm(event.room, event.value) then
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−		event.status_codes["104"] = true;
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−	end
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−end);
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−
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−module:hook("muc-config-submitted/{xmpp:prosody.im}muc#allow_modpm", function(event)
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−	if set_allow_modpm(event.room, event.value) then
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−		event.status_codes["104"] = true;
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−	end
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−end);
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−
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−local who_restricted = {
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−	none = "in this group";
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−	participant = "from guests";
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−	moderator = "from non-moderators";
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−	affiliated = "from non-members";
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−};
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−
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−module:hook("muc-private-message", function(event)
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−	local stanza, room = event.stanza, event.room;
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−	local from_occupant = room:get_occupant_by_nick(stanza.attr.from);
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−	local to_occupant = room:get_occupant_by_nick(stanza.attr.to);
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−
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−	-- To self is always okay
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−	if to_occupant.bare_jid == from_occupant.bare_jid then return; end
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−
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−	if get_allow_modpm(room) then
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−		if to_occupant and to_occupant.role == 'moderator'
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−		or from_occupant and from_occupant.role == "moderator" then
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−			return; -- Allow to/from moderators
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−		end
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−	end
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−
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−	local pmval = get_allow_pm(room);
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−
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−	if pmval ~= "none" then
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−		if pmval == "affiliated" and room:get_affiliation(from_occupant.bare_jid) then
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−			return; -- Allow from affiliated users
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−		elseif valid_roles[from_occupant.role] >= valid_roles[pmval] then
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−			module:log("debug", "Allowing PM: %s(%d) >= %s(%d)", from_occupant.role, valid_roles[from_occupant.role], pmval, valid_roles[pmval]);
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−			return; -- Allow from a permitted role
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−		end
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−	end
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−
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−	local msg = ("Private messages are restricted %s"):format(who_restricted[pmval]);
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−	module:log("debug", "Blocking PM from %s %s: %s", from_occupant.role, stanza.attr.from, msg);
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−
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−	room:route_to_occupant(
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−		from_occupant,
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−		st.error_reply(stanza, "cancel", "policy-violation", msg, room.jid)
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−	);
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−	return false;
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−end, 1);
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−
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−return {
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−	get_allow_pm = get_allow_pm;
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−	set_allow_pm = set_allow_pm;
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−	get_allow_modpm = get_allow_modpm;
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−	set_allow_modpm = set_allow_modpm;
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−};