plugins/muc/register.lib.lua
author Kim Alvefur <zash@zash.se>
Mon, 12 Dec 2022 07:07:13 +0100
branch0.12
changeset 12803 3784a8ce0596
parent 12033 631b2afa7bc1
child 12981 74b9e05af71e
permissions -rw-r--r--
Merge 0.11->0.12
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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local jid_bare = require "util.jid".bare;
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local jid_resource = require "util.jid".resource;
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local resourceprep = require "util.encodings".stringprep.resourceprep;
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local st = require "util.stanza";
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local dataforms = require "util.dataforms";
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local allow_unaffiliated = module:get_option_boolean("allow_unaffiliated_register", false);
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local enforce_nick = module:get_option_boolean("enforce_registered_nickname", false);
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-- Whether to include the current registration data as a dataform. Disabled
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-- by default currently as it hasn't been widely tested with clients.
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local include_reg_form = module:get_option_boolean("muc_registration_include_form", false);
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-- reserved_nicks[nick] = jid
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local function get_reserved_nicks(room)
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	if room._reserved_nicks then
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		return room._reserved_nicks;
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	end
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	module:log("debug", "Refreshing reserved nicks...");
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	local reserved_nicks = {};
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	for jid, _, data in room:each_affiliation() do
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		local nick = data and data.reserved_nickname;
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		module:log("debug", "Refreshed for %s: %s", jid, nick);
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		if nick then
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			reserved_nicks[nick] = jid;
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		end
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	end
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	room._reserved_nicks = reserved_nicks;
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	return reserved_nicks;
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end
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-- Returns the registered nick, if any, for a JID
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-- Note: this is just the *nick* part, i.e. the resource of the in-room JID
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local function get_registered_nick(room, jid)
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	local registered_data = room._affiliation_data[jid];
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	if not registered_data then
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		return;
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	end
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	return registered_data.reserved_nickname;
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end
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-- Returns the JID, if any, that registered a nick (not in-room JID)
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local function get_registered_jid(room, nick)
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	local reserved_nicks = get_reserved_nicks(room);
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	return reserved_nicks[nick];
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end
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module:hook("muc-set-affiliation", function (event)
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	-- Clear reserved nick cache
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	event.room._reserved_nicks = nil;
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end);
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module:hook("muc-disco#info", function (event)
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	event.reply:tag("feature", { var = "jabber:iq:register" }):up();
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end);
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local registration_form = dataforms.new {
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	{ name = "FORM_TYPE", type = "hidden", value = "http://jabber.org/protocol/muc#register" },
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	{ name = "muc#register_roomnick", type = "text-single", required = true, label = "Nickname"},
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};
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module:handle_items("muc-registration-field", function (event)
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	module:log("debug", "Adding MUC registration form field: %s", event.item.name);
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	table.insert(registration_form, event.item);
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end, function (event)
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	module:log("debug", "Removing MUC registration form field: %s", event.item.name);
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	local removed_field_name = event.item.name;
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	for i, field in ipairs(registration_form) do
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		if field.name == removed_field_name then
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			table.remove(registration_form, i);
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			break;
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		end
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	end
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end);
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local function enforce_nick_policy(event)
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	local origin, stanza = event.origin, event.stanza;
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	local room = assert(event.room); -- FIXME
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	if not room then return; end
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	-- Check if the chosen nickname is reserved
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	local requested_nick = jid_resource(stanza.attr.to);
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	local reserved_by = get_registered_jid(room, requested_nick);
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	if reserved_by and reserved_by ~= jid_bare(stanza.attr.from) then
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		module:log("debug", "%s attempted to use nick %s reserved by %s", stanza.attr.from, requested_nick, reserved_by);
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		local reply = st.error_reply(stanza, "cancel", "conflict", nil, room.jid):up();
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		origin.send(reply);
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		return true;
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	end
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	-- Check if the occupant has a reservation they must use
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	if enforce_nick then
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		local nick = get_registered_nick(room, jid_bare(stanza.attr.from));
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		if nick then
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			if event.occupant then
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				event.occupant.nick = jid_bare(event.occupant.nick) .. "/" .. nick;
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			elseif event.dest_occupant.nick ~= jid_bare(event.dest_occupant.nick) .. "/" .. nick then
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				module:log("debug", "Attempt by %s to join as %s, but their reserved nick is %s", stanza.attr.from, requested_nick, nick);
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				local reply = st.error_reply(stanza, "cancel", "not-acceptable", nil, room.jid):up();
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				origin.send(reply);
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				return true;
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			end
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		end
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	end
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end
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module:hook("muc-occupant-pre-join", enforce_nick_policy);
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module:hook("muc-occupant-pre-change", enforce_nick_policy);
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-- Discovering Reserved Room Nickname
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-- http://xmpp.org/extensions/xep-0045.html#reservednick
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module:hook("muc-disco#info/x-roomuser-item", function (event)
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	local nick = get_registered_nick(event.room, jid_bare(event.stanza.attr.from));
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   115
	if nick then
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   116
		event.reply:tag("identity", { category = "conference", type = "text", name = nick })
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   117
	end
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   118
end);
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   119
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local function handle_register_iq(room, origin, stanza)
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   121
	local user_jid = jid_bare(stanza.attr.from)
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   122
	local affiliation = room:get_affiliation(user_jid);
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   123
	if affiliation == "outcast" then
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   124
		origin.send(st.error_reply(stanza, "auth", "forbidden"));
9243
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   125
		return true;
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   126
	elseif not (affiliation or allow_unaffiliated) then
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		origin.send(st.error_reply(stanza, "auth", "registration-required"));
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		return true;
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   129
	end
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	local reply = st.reply(stanza);
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	local registered_nick = get_registered_nick(room, user_jid);
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	if stanza.attr.type == "get" then
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		reply:query("jabber:iq:register");
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   134
		if registered_nick then
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			reply:tag("registered"):up();
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   136
			reply:tag("username"):text(registered_nick):up();
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   137
			if include_reg_form then
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				local aff_data = room:get_affiliation_data(user_jid);
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   139
				if aff_data then
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					reply:add_child(registration_form:form(aff_data, "result"));
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   141
				end
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   142
			end
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   143
			origin.send(reply);
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			return true;
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   145
		end
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		reply:add_child(registration_form:form());
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	else -- type == set -- handle registration form
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		local query = stanza.tags[1];
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		if query:get_child("remove") then
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   150
			-- Remove "member" affiliation, but preserve if any other
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			local new_affiliation = affiliation ~= "member" and affiliation;
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			local ok, err_type, err_condition = room:set_affiliation(true, user_jid, new_affiliation, nil, false);
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   153
			if not ok then
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   154
				origin.send(st.error_reply(stanza, err_type, err_condition));
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   155
				return true;
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   156
			end
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   157
			origin.send(reply);
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   158
			return true;
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   159
		end
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   160
		local form_tag = query:get_child("x", "jabber:x:data");
10346
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diff changeset
   161
		if not form_tag then
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   162
			origin.send(st.error_reply(stanza, "modify", "bad-request", "Missing dataform"));
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   163
			return true;
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   164
		end
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   165
		local form_type, err = dataforms.get_type(form_tag);
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diff changeset
   166
		if not form_type then
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diff changeset
   167
			origin.send(st.error_reply(stanza, "modify", "bad-request", "Error with form: "..err));
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diff changeset
   168
			return true;
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   169
		elseif form_type ~= "http://jabber.org/protocol/muc#register" then
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diff changeset
   170
			origin.send(st.error_reply(stanza, "modify", "bad-request", "Error in form"));
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   171
			return true;
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diff changeset
   172
		end
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   173
		local reg_data = registration_form:data(form_tag);
9243
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   174
		if not reg_data then
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   175
			origin.send(st.error_reply(stanza, "modify", "bad-request", "Error in form"));
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   176
			return true;
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   177
		end
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   178
		-- Is the nickname valid?
10798
4585fe53e21f MUC: Enforce strict resourceprep when registering room nicknames
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   179
		local desired_nick = resourceprep(reg_data["muc#register_roomnick"], true);
9243
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   180
		if not desired_nick then
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   181
			origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid Nickname"));
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   182
			return true;
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parents:
diff changeset
   183
		end
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parents:
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   184
		-- Is the nickname currently in use by another user?
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   185
		local current_occupant = room:get_occupant_by_nick(room.jid.."/"..desired_nick);
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   186
		if current_occupant and current_occupant.bare_jid ~= user_jid then
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parents:
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   187
			origin.send(st.error_reply(stanza, "cancel", "conflict"));
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parents:
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   188
			return true;
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parents:
diff changeset
   189
		end
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parents:
diff changeset
   190
		-- Is the nickname currently reserved by another user?
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parents:
diff changeset
   191
		local reserved_by = get_registered_jid(room, desired_nick);
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parents:
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   192
		if reserved_by and reserved_by ~= user_jid then
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parents:
diff changeset
   193
			origin.send(st.error_reply(stanza, "cancel", "conflict"));
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parents:
diff changeset
   194
			return true;
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parents:
diff changeset
   195
		end
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parents:
diff changeset
   196
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parents:
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   197
		if enforce_nick then
9265
37b7cf3470f1 MUC: Move comment for clarity
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parents: 9243
diff changeset
   198
			-- Kick any sessions that are not using this nick before we register it
9243
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parents:
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   199
			local required_room_nick = room.jid.."/"..desired_nick;
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parents:
diff changeset
   200
			for room_nick, occupant in room:each_occupant() do
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parents:
diff changeset
   201
				if occupant.bare_jid == user_jid and room_nick ~= required_room_nick then
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parents:
diff changeset
   202
					room:set_role(true, room_nick, nil); -- Kick (TODO: would be nice to use 333 code)
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parents:
diff changeset
   203
				end
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parents:
diff changeset
   204
			end
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parents:
diff changeset
   205
		end
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parents:
diff changeset
   206
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parents:
diff changeset
   207
		-- Checks passed, save the registration
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parents:
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   208
		if registered_nick ~= desired_nick then
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parents:
diff changeset
   209
			local registration_data = { reserved_nickname = desired_nick };
11290
336cba957c88 MUC: Allow modules to add to the room registration form, and handle the result
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parents: 10798
diff changeset
   210
			module:fire_event("muc-registration-submitted", {
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diff changeset
   211
				room = room;
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diff changeset
   212
				origin = origin;
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diff changeset
   213
				stanza = stanza;
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diff changeset
   214
				submitted_data = reg_data;
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diff changeset
   215
				affiliation_data = registration_data;
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parents: 10798
diff changeset
   216
			});
9301
2d71040a959f MUC: If a user with an existing affiliation registers, preserve that affiliation (thanks jc)
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parents: 9265
diff changeset
   217
			local ok, err_type, err_condition = room:set_affiliation(true, user_jid, affiliation or "member", nil, registration_data);
9243
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parents:
diff changeset
   218
			if not ok then
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parents:
diff changeset
   219
				origin.send(st.error_reply(stanza, err_type, err_condition));
f9a83aca4421 MUC: Add support for registering with a MUC, including reserving a nickname as per XEP-0045
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parents:
diff changeset
   220
				return true;
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parents:
diff changeset
   221
			end
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parents:
diff changeset
   222
			module:log("debug", "Saved nick registration for %s: %s", user_jid, desired_nick);
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parents:
diff changeset
   223
			origin.send(reply);
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parents:
diff changeset
   224
			return true;
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parents:
diff changeset
   225
		end
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parents:
diff changeset
   226
	end
f9a83aca4421 MUC: Add support for registering with a MUC, including reserving a nickname as per XEP-0045
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parents:
diff changeset
   227
	origin.send(reply);
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parents:
diff changeset
   228
	return true;
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parents:
diff changeset
   229
end
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parents:
diff changeset
   230
f9a83aca4421 MUC: Add support for registering with a MUC, including reserving a nickname as per XEP-0045
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parents:
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return {
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	get_registered_nick = get_registered_nick;
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	get_registered_jid = get_registered_jid;
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	handle_register_iq = handle_register_iq;
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}