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.
38 lines
996 B
PHP
38 lines
996 B
PHP
<?php
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declare(strict_types=1);
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namespace App\Support;
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final class UrlDetector
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{
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/** PCRE matching bare http(s) URLs; shared with Bluesky link-facet parsing. */
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public const string URL_PATTERN = '/(https?:\/\/[^\s]+)/u';
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public static function firstUrl(string $text): ?string
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{
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if (preg_match(self::URL_PATTERN, $text, $matches) !== 1) {
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return null;
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}
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return self::trimTrailingPunctuation($matches[0]);
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}
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/**
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* Trailing sentence punctuation and an unmatched closing paren are almost
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* never part of a URL (e.g. "see https://x.com)."). Mirrors the official
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* atproto link tokenizer.
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*/
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public static function trimTrailingPunctuation(string $url): string
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{
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if (preg_match('/[.,;:!?]$/', $url)) {
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$url = substr($url, 0, -1);
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}
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if (str_ends_with($url, ')') && ! str_contains($url, '(')) {
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$url = substr($url, 0, -1);
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}
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return $url;
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}
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}
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