protected function doStreamPreparation()
{
$tag = common_canonical_tag($this->arg('tag'));
try {
$this->peopletag = Profile_list::getByPK(array('tagger' => $this->target->getID(), 'tag' => $tag));
} catch (NoResultException $e) {
// TRANS: Client error displayed trying to reference a non-existing list.
throw new ClientException('No such list.');
}
if ($this->peopletag->private && !$this->peopletag->getTagger()->sameAs($this->scoped)) {
// TRANS: Client error displayed trying to reference a non-existing list.
throw new AuthorizationException('You do not have permission to see this list.');
}
}