/**
* Parses HTML documents OpenGraph metadata
*
* @param HtmlDocument $document HTML document to be parsed.
* @return void
*/
public function handle(HtmlDocument $document)
{
if (strlen($document->getTitle()) == 0) {
$ogTitle = $document->getMetaContent('og:title');
if (strlen($ogTitle) > 0) {
$document->setTitle($ogTitle);
}
}
if (strlen($document->getDescription()) == 0) {
$ogDescription = $document->getMetaContent('og:description');
if (strlen($ogDescription) > 0) {
$document->setDescription($ogDescription);
}
}
if (strlen($document->getImage()) == 0) {
$ogImage = $document->getMetaContent('og:image:secure_url') ?: $document->getMetaContent('og:image');
if (strlen($ogImage) > 0) {
$document->setImage($ogImage);
}
}
if (!$document->getExtraField('SITE_NAME')) {
$ogSiteName = $document->getMetaContent('og:site_name');
if (strlen($ogSiteName) > 0) {
$document->setExtraField('SITE_NAME', $ogSiteName);
}
}
/* Not really opengraph property :), but it's placed in opengraph parser to prevent executing full parser chain
just to get favicon */
if (!$document->getExtraField('FAVICON')) {
if ($favicon = $document->getLinkHref('icon')) {
$document->setExtraField('FAVICON', $favicon);
}
}
}
/**
* @param HtmlDocument $document HTML document to scan for title.
* @return string
*/
protected function getTitle(HtmlDocument $document)
{
$title = $document->getMetaContent('title');
if (strlen($title) > 0) {
return $title;
}
preg_match('/<title>(.+?)<\\/title>/mis', $document->getHtml(), $matches);
return isset($matches[1]) ? $matches[1] : null;
}