/**
* Extract information from the <link> elements
*
* @param \DOMDocument $html
* @param Bag $bag
*/
protected static function extractFromLink(\DOMDocument $html, Bag $bag)
{
foreach (Utils::getLinks($html) as $link) {
list($rel, $href, $element) = $link;
if (empty($href)) {
continue;
}
switch ($rel) {
case 'favicon':
case 'favico':
case 'icon':
case 'shortcut icon':
case 'apple-touch-icon-precomposed':
case 'apple-touch-icon':
$bag->add('icons', $href);
break;
case 'image_src':
$bag->add('images', $href);
break;
case 'alternate':
switch ($element->getAttribute('type')) {
case 'application/rss+xml':
case 'application/atom+xml':
$bag->add('feeds', $href);
break;
}
break;
default:
$bag->set($rel, $href);
}
}
}
/**
* Extract oembed information from the <link rel="alternate"> elements
* Note: Some sites use <meta rel="alternate"> instead
*
* @param \DOMDocument $html
*
* @return string|null
*/
protected static function getEndPointFromDom(\DOMDocument $html)
{
foreach (['link', 'meta'] as $tagName) {
foreach (Utils::getLinks($html, $tagName) as $link) {
list($rel, $href, $element) = $link;
if (empty($href)) {
continue;
}
if ($rel === 'alternate') {
switch (strtolower($element->getAttribute('type'))) {
case 'application/json+oembed':
case 'application/xml+oembed':
case 'text/json+oembed':
case 'text/xml+oembed':
return $href;
}
}
}
}
}
