Programming Jabber

Dealing with other requests

There are untold IQ elements that could be sent to the component. While it would be possible just to ignore them, we ought to do something and at least respond with something like “not supported.” For that, we have iq_notimpl() as a catch-all. If the dispatcher manages to make its way to here, we know that the <iq/> element is not anything we recognize as wanting to respond to.

The following can be used to tell the requester that what they’re asking for hasn’t been implemented:

sub iq_notimpl {
  my $node = shift;
  $node = toFrom($node);
  $node->attr('type', IQ_ERROR);
  my $error = $node->insertTag('error');
  $error->attr('code', '501');
  $error->data('Not Implemented');
  $c->send($node);

  return r_HANDLED;
}

As you can see, all this does is set the <iq/> type to error, switches the from and to, and adds an <error/> tag:

<error code='501'>Not Implemented</error>

The modified element is sent back to the requester. This lets them know that they’ve requested something that just isn’t there or hasn’t been implemented yet.