webmentions/src/Endpoint.php

<?php declare(strict_types=1);

namespace Lewisdale\Webmentions;

use Lewisdale\Webmentions\Exceptions\InvalidTargetException;
use Lewisdale\Webmentions\Exceptions\InvalidUrlException;
use Lewisdale\Webmentions\Gateways\WebmentionGatewayInterface;
use Lewisdale\Webmentions\Models\Webmention;
use Symfony\Component\HttpClient\HttpClient;

class Endpoint {
    private readonly WebmentionGatewayInterface $gateway;

    public function validateUrl(string $url) : bool {
        return !!filter_var($url, FILTER_VALIDATE_URL);
    }

    public function receiveWebmention(string $source, string $target) : void
    {
        // Validate that both source and target are actual domains
        if (!$this->validateUrl($source) || !$this->validateUrl($target))
        {
            throw new InvalidUrlException();
        }

        // Validate that the webmention target is a domain I care about
        if (!str_contains($target, "https://lewisdale.dev")) {
            throw new InvalidTargetException();
        }

        // Parse content from the source
        $client = HttpClient::create();
        $response = $client->request('GET', $source);

        if ($response->getStatusCode() === 200)
        {
            $content = $this->parseContent($response->getContent());
            $author = $this->parseAuthor($response->getContent());

            $webmention = new Webmention(null, $target, $source, $content, $author);
            $this->gateway->save($webmention);
        }
    }

    private function parseContent(string $content) : ?string
    {
        return null;
    }

    private function parseAuthor(string $author) : ?string
    {
        return null;
    }
}