8648ed9720
Bluesky does not hydrate link cards server-side, so build the app.bsky.embed.external embed at publish time: detect the first URL, scrape its OpenGraph metadata, and re-upload the og:image as the card thumb. Works for web, API and MCP. Adds a posts/link-preview endpoint so the editor renders the card live. The thumb download is SSRF-guarded and does not follow redirects.
75 lines
2 KiB
PHP
75 lines
2 KiB
PHP
<?php
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declare(strict_types=1);
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namespace App\Services\Social\LinkCard;
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use Symfony\Component\DomCrawler\Crawler;
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use Symfony\Component\DomCrawler\UriResolver;
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/**
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* Deterministic OpenGraph reader for link preview cards. Pulls og:title /
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* og:description / og:image with <title> and meta-description fallbacks.
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* Deliberately separate from HomepageMetaExtractor, which is brand-tuned and
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* intentionally excludes og:image.
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*/
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final class OpenGraphExtractor
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{
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/**
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* @return array{title: ?string, description: ?string, image: ?string}
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*/
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public function extract(string $html, string $baseUrl): array
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{
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$crawler = new Crawler($html, $baseUrl);
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return [
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'title' => $this->title($crawler),
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'description' => $this->metaContent($crawler, 'property', 'og:description')
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?? $this->metaContent($crawler, 'name', 'description'),
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'image' => $this->image($crawler, $baseUrl),
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];
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}
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private function title(Crawler $crawler): ?string
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{
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$ogTitle = $this->metaContent($crawler, 'property', 'og:title');
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if ($ogTitle !== null) {
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return $ogTitle;
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}
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$title = $crawler->filter('title')->first();
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if ($title->count() === 0) {
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return null;
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}
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$text = trim($title->text(''));
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return $text === '' ? null : $text;
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}
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private function image(Crawler $crawler, string $baseUrl): ?string
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{
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$image = $this->metaContent($crawler, 'property', 'og:image');
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if ($image === null) {
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return null;
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}
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return UriResolver::resolve($image, $baseUrl);
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}
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private function metaContent(Crawler $crawler, string $attr, string $value): ?string
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{
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$node = $crawler->filter(sprintf('meta[%s="%s"]', $attr, $value))->first();
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if ($node->count() === 0) {
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return null;
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}
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$content = trim((string) $node->attr('content', ''));
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return $content === '' ? null : $content;
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}
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}
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