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<?php
declare(strict_types=1);
namespace Shaarli\Http;
use Shaarli\Config\ConfigManager;
/**
* HTTP Tool used to extract metadata from external URL (title, description, etc.).
*/
class MetadataRetriever
{
/** @var ConfigManager */
protected $conf;
/** @var HttpAccess */
protected $httpAccess;
public function __construct(ConfigManager $conf, HttpAccess $httpAccess)
{
$this->conf = $conf;
$this->httpAccess = $httpAccess;
}
/**
* Retrieve metadata for given URL.
*
* @return array [
* 'title' => <remote title>,
* 'description' => <remote description>,
* 'tags' => <remote keywords>,
* ]
*/
public function retrieve(string $url): array
{
$charset = null;
$title = null;
$description = null;
$tags = null;
$retrieveDescription = $this->conf->get('general.retrieve_description');
// Short timeout to keep the application responsive
// The callback will fill $charset and $title with data from the downloaded page.
$this->httpAccess->getHttpResponse(
$url,
$this->conf->get('general.download_timeout', 30),
$this->conf->get('general.download_max_size', 4194304),
$this->httpAccess->getCurlHeaderCallback($charset),
$this->httpAccess->getCurlDownloadCallback(
$charset,
$title,
$description,
$tags,
$retrieveDescription
)
);
if (!empty($title) && strtolower($charset) !== 'utf-8') {
$title = mb_convert_encoding($title, 'utf-8', $charset);
}
return [
'title' => $title,
'description' => $description,
'tags' => $tags,
];
}
}
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