mod_roster_command: Fix subscription when the "user JID" is a bare domain. Do not attempt to update the roster when the user is bare domain (e.g. a component), since they don't have rosters and the attempt results in an error: $ prosodyctl mod_roster_command subscribe proxy.example.com contact@example.com xxxxxxxxxxFailed to execute command: Error: /usr/lib/prosody/core/rostermanager.lua:104: attempt to concatenate local 'username' (a nil value) stack traceback: /usr/lib/prosody/core/rostermanager.lua:104: in function 'load_roster' /usr/lib/prosody/core/rostermanager.lua:305: in function 'set_contact_pending_out' mod_roster_command.lua:44: in function 'subscribe'

local mark_storage = module:open_store("firewall_marks");

local user_sessions = prosody.hosts[module.host].sessions;

module:hook("resource-bind", function (event)
	local session = event.session;
	local username = session.username;
	local user = user_sessions[username];
	local marks = user.firewall_marks;
	if not marks then
		marks = mark_storage:get(username) or {};
		user.firewall_marks = marks; -- luacheck: ignore 122
	end
	session.firewall_marks = marks;
end);

module:hook("resource-unbind", function (event)
	local session = event.session;
	local username = session.username;
	local marks = session.firewall_marks;
	mark_storage:set(username, marks);
end);