63 lines
1.9 KiB
PHP
63 lines
1.9 KiB
PHP
<?php declare(strict_types=1);
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namespace Lewisdale\Webmentions;
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use Symfony\Contracts\HttpClient\ResponseInterface;
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use Symfony\Component\DomCrawler\Crawler;
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use League\Uri\Uri;
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use League\Uri\UriInfo;
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use League\Uri\UriResolver;
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class EndpointParser {
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public static function parse(ResponseInterface $response) : string | null
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{
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$endpoint = self::parseHeaders($response) ?? self::parseBody($response);
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return self::absoluteURL($response, $endpoint);
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}
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private static function parseHeaders(ResponseInterface $response) : string | null {
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$headers = $response->getHeaders();
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if (isset($headers["link"])) {
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foreach($headers["link"] as $link) {
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if (preg_match('/rel=("?)webmention("?)/', $link)) {
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$matches = [];
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preg_match('/\<(..*?)\>/', $link, $matches);
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if (count($matches) > 1) {
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return $matches[1];
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}
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}
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}
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}
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return null;
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}
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private static function absoluteURL(ResponseInterface $response, ?string $endpoint) : string | null {
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if (!$endpoint) {
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return null;
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}
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$url = $response->getInfo("redirect_url") ?? $response->getInfo('url');
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$uri = Uri::createFromString($url);
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$endpoint = Uri::createFromString($endpoint);
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if (!UriInfo::isAbsolute($endpoint)) {
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return (string) UriResolver::resolve($endpoint, $uri);
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}
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return (string) $endpoint;
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}
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private static function parseBody(ResponseInterface $response) : string | null {
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$doc = new Crawler($response->getContent());
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$webmentions = $doc->filter('[rel="webmention"][href]');
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if ($webmentions->count()) {
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return $webmentions->first()->attr('href');
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}
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return null;
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}
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} |