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<?php declare(strict_types=1); |
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/* |
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* This file is part of the feed-io package. |
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* |
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* (c) Alexandre Debril <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace FeedIo; |
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use FeedIo\Adapter\ClientInterface; |
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use Psr\Log\LoggerInterface; |
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class Explorer |
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{ |
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/** |
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* @var \FeedIo\Adapter\ClientInterface; |
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*/ |
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protected $client; |
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/** |
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* @var \Psr\Log\LoggerInterface |
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*/ |
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protected $logger; |
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const VALID_TYPES = [ |
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'application/atom+xml', |
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'application/rss+xml' |
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]; |
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/** |
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* @param \FeedIo\Adapter\ClientInterface $client |
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* @param \Psr\Log\LoggerInterface $logger |
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*/ |
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public function __construct(ClientInterface $client, LoggerInterface $logger) |
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{ |
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$this->client = $client; |
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$this->logger = $logger; |
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} |
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/** |
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* Discover feeds from the webpage's headers |
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* @param string $url |
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* @return array |
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*/ |
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public function discover(string $url) : array |
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{ |
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$this->logger->info("discover feeds from {$url}"); |
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$stream = $this->client->getResponse($url, new \DateTime); |
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$internalErrors = libxml_use_internal_errors(true); |
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$entityLoaderDisabled = libxml_disable_entity_loader(true); |
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$feeds = $this->extractFeeds($stream->getBody()); |
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libxml_use_internal_errors($internalErrors); |
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libxml_disable_entity_loader($entityLoaderDisabled); |
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return $feeds; |
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} |
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/** |
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* Extract feeds Urls from HTML stream |
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* @param string $html |
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* @return array |
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*/ |
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protected function extractFeeds(string $html) : array |
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{ |
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$dom = new \DOMDocument(); |
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$dom->loadHTML($html); |
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$links = $dom->getElementsByTagName('link'); |
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$feeds = []; |
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foreach ($links as $link) { |
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if ($this->isFeedLink($link)) { |
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$feeds[] = $link->getAttribute('href'); |
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} |
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} |
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return $feeds; |
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} |
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/** |
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* Tells if the given Element contains a valid Feed Url |
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* @param DomElement $element |
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* @return bool |
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*/ |
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protected function isFeedLink(\DomElement $element) : bool |
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{ |
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return $element->hasAttribute('type') |
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&& in_array($element->getAttribute('type'), self::VALID_TYPES); |
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} |
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} |
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alexdebril /
feed-io
