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