webmentions/src/Webmention.php

<?php

namespace Lewisdale\Webmentions;

use Symfony\Component\DomCrawler\Crawler;
use Symfony\Component\HttpClient\HttpClient;
use Symfony\Contracts\HttpClient\HttpClientInterface;

class Webmention {
    private readonly HttpClientInterface $client;

    function __construct()
    {
        $this->client = HttpClient::create();
    }

    public function sendForPage(string $source) : void {
        // $urls = $this->getUrls($source);

        // foreach($urls as $target) {
        //     $this->sendWebmention($source, $target);
        // }

        $this->sendWebmention($source, "https://webmention.rocks/test/23/page");
    }

    private function getUrls(string $url) : array {
        $page = file_get_contents($url);
        $doc = new Crawler($page);

        $urls = [];
        foreach ($doc->filter('.h-entry a') as $anchor) {
            $target_url = $anchor->attributes->getNamedItem('href')->textContent;

            if ($target_url !== null && strlen($target_url)) {
              $urls[] = $target_url;
            } 
        }
        return $urls;
    }

    private function sendWebmention(string $source, string $target) {
        // 1. Endpoint discovery
        //   1.1 Parse page
        //   1.2 Look for rel="webmention"
        $endpoint = $this->getWebmentionEndpoint($target);
        echo ($endpoint ?? "no :(") . "<br />";
        // 2. Send webmention to endpoint
    }

    private function getWebmentionEndpoint(string $url) : string | null {
        $response = $this->client->request('GET', $url);
        // echo "<pre>";
        // var_dump($response->getInfo());
        // echo "</pre>";

        return EndpointParser::parse($response);

        // $doc = new Crawler($page);

        // $links = $doc->filter('link[rel="webmention"]');

        // if ($links->count()) {
        //     return $links->first()->attr('href');
        // } else {
        //     return null;
        // }

    }
}
?>