mod_compat_roles: Fix attempt to index a nil value #1847
permissions[] is not a map with role names as keys since 817bc9873fc2
but instead a level with host names were added. This was likely an
oversight.
Refactored towards railroad.
local hostname = module:get_option_string("sasl_hostname", module.host);
module:hook("stream-features", function(event)
local features = event.features;
local mechs = features:get_child("mechanisms", "urn:ietf:params:xml:ns:xmpp-sasl");
if mechs then
mechs:tag("hostname", { xmlns = "urn:xmpp:domain-based-name:1" })
:text(hostname):up();
end
end);