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'

module:set_global()

local hosts = prosody.hosts;

module:hook("s2s-check-certificate", function(event)
	local session, cert = event.session, event.cert;
	if session.direction ~= "incoming" then return end
	
	local outgoing = hosts[session.to_host].s2sout[session.from_host];
	if outgoing and outgoing.type == "s2sout" and outgoing.secure and outgoing.conn:socket():getpeercertificate():pem() == cert:pem() then
		session.log("debug", "Certificate matches that of s2sout%s", tostring(outgoing):match("[a-f0-9]+$"));
		session.cert_identity_status = outgoing.cert_identity_status;
		session.cert_chain_status = outgoing.cert_chain_status;
		return true;
	end
end, 1000);