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<?php |
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namespace Bangpound\oEmbed\Provider; |
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use Bangpound\oEmbed\Exception\UnknownFormatException; |
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use GuzzleHttp\ClientInterface; |
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use GuzzleHttp\Psr7; |
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use Negotiation\FormatNegotiatorInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Symfony\Component\DomCrawler\Crawler; |
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class DiscoveryProvider implements ProviderInterface |
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{ |
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const LINK_ANY_XPATH = '//head/link[@rel = \'alternate\' and (@type = \'application/json+oembed\' or @type = \'text/xml+oembed\')]'; |
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const LINK_JSON_XPATH = '//head/link[@rel = \'alternate\' and @type = \'application/json+oembed\']'; |
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const LINK_XML_XPATH = '//head/link[@rel = \'alternate\' and @type = \'text/xml+oembed\']'; |
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/** |
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* @var ClientInterface |
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*/ |
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private $client; |
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/** |
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* @var FormatNegotiatorInterface |
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*/ |
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private $negotiator; |
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/** |
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* @param ClientInterface $client |
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* @param FormatNegotiatorInterface $negotiator |
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*/ |
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public function __construct(ClientInterface $client, FormatNegotiatorInterface $negotiator) |
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{ |
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$this->client = $client; |
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$this->negotiator = $negotiator; |
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} |
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/** |
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* Returns whether this class supports the given resource. |
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* |
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* @param string $url A url |
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* @param array $params The resource type or null if unknown |
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* |
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* @return bool True if this class supports the given url, false otherwise |
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*/ |
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public function supports($url, array $params = array()) |
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{ |
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$links = $this->discoverLinks($url, $params); |
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return !empty($links); |
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} |
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/** |
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* @param $url |
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* @param array $params |
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* |
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* @return Psr7\Request |
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*/ |
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public function request($url, array $params = array()) |
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{ |
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$links = self::discoverLinks($url, $params); |
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$uri = new Psr7\Uri($links[0][0]); |
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return new Psr7\Request('get', $uri); |
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} |
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/** |
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* @param string $url |
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* @param array $params |
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* |
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* @return array |
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*/ |
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private function discoverLinks($url, array $params = array()) |
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{ |
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$request = new Psr7\Request('get', $url); |
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$response = $this->client->send($request); |
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$xpath = isset($params['format']) ? self::xpathForFormat($params['format']) : self::LINK_ANY_XPATH; |
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$links = self::responseBodyOEmbedLinks($response, $xpath); |
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if (!empty($links) && isset($params['format'])) { |
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$links = array_filter($links, function ($link) use ($params) { |
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return $this->negotiator->getFormat($link[1]) !== null && $params['format'] === $this->negotiator->getFormat($link[1]); |
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}); |
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} |
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return $links; |
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} |
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/** |
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* @param $format |
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* |
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* @return string |
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*/ |
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private static function xpathForFormat($format) |
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{ |
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if ($format === 'json') { |
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return self::LINK_JSON_XPATH; |
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} |
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if ($format === 'xml') { |
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return self::LINK_XML_XPATH; |
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} |
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throw new UnknownFormatException(); |
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} |
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/** |
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* @param ResponseInterface $response |
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* @param string $xpath |
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* |
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* @return array |
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*/ |
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private static function responseBodyOEmbedLinks(ResponseInterface $response, $xpath) |
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{ |
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$contents = $response->getBody()->getContents(); |
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$crawler = new Crawler($contents); |
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return $crawler->filterXPath($xpath)->extract(array('href', 'type')); |
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} |
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} |
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bangpound /
oEmbed
