protected function _resolveTitle(Url $url)
{
if (!$url->isHttp()) {
return $url->toString();
}
$http = new Http(5);
$res = $http->get($url);
if (!$res->isSuccess()) {
return $url->toString();
}
$url = $res->url();
if (!preg_match('/^text\\/html/i', $res->header('content-type'))) {
return $url->toString();
}
$doc = new DOMDocument();
libxml_use_internal_errors(true);
$result = $doc->loadHTML($res->body());
libxml_use_internal_errors(false);
if (!$result) {
return $url->toString();
}
$xpath = new DOMXPath($doc);
$els = $xpath->query('//title');
if (!$els->length) {
return $url->toString();
}
return $els->item(0)->textContent;
}
public function toCanonical()
{
$url = clone $this;
if (!$url->isHttp()) {
return $url;
}
$http = new Http(5);
$res = $http->get($url);
if (!$res->isSuccess()) {
return $url;
}
$url = $res->url();
if (!preg_match('/^text\\/html/i', $res->header('content-type'))) {
return $url;
}
$doc = new DOMDocument();
libxml_use_internal_errors(true);
$result = $doc->loadHTML($res->body());
libxml_use_internal_errors(false);
if (!$result) {
return $url;
}
$types = [['//link[@rel="canonical"]', 'href'], ['//meta[@property="og:url"]', 'content']];
$xpath = new DOMXPath($doc);
foreach ($types as $type) {
$els = $xpath->query($type[0]);
if ($els->length) {
$url = new Url($els->item(0)->getAttribute($type[1]));
break;
}
}
return $url;
}