private function getCanonicalLink()
{
$nodes = $this->getNodesByLowercasePropertyValue($this->article()->getDoc(), 'link', 'rel', 'canonical');
if ($nodes->count()) {
return trim($nodes->first()->attr('href'));
}
$nodes = $this->getNodesByLowercasePropertyValue($this->article()->getDoc(), 'meta', 'property', 'og:url');
if ($nodes->count()) {
return trim($nodes->first()->attr('content'));
}
$nodes = $this->getNodesByLowercasePropertyValue($this->article()->getDoc(), 'meta', 'name', 'twitter:url');
if ($nodes->count()) {
return trim($nodes->first()->attr('content'));
}
return $this->article()->getFinalUrl();
}