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'

-- mod_c2s_limit_sessions

local next, count = next, require "util.iterators".count;

local max_resources = module:get_option_number("max_resources", 10);

local sessions = hosts[module.host].sessions;
module:hook("resource-bind", function(event)
	local session = event.session;
	if count(next, sessions[session.username].sessions) > max_resources then
		session:close{ condition = "policy-violation", text = "Too many resources" };
		return false
	end
end, -1);