72 lines
2.1 KiB
PHP
72 lines
2.1 KiB
PHP
<?php
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namespace App\MetadataResolver;
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use Psr\Http\Message\ResponseInterface;
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class ActivityPubResolver implements Resolver, Parser
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{
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/**
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* @var \GuzzleHttp\Client
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*/
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private $activityClient;
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public function __construct()
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{
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$this->activityClient = new \GuzzleHttp\Client([
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'headers' => [
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'Accept' => 'application/activity+json, application/ld+json; profile="https://www.w3.org/ns/activitystreams"'
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]
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]);
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}
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public function resolve(string $url): Metadata
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{
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$res = $this->activityClient->get($url);
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if ($res->getStatusCode() === 200) {
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return $this->parse($res->getBody());
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} else {
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throw new \RuntimeException("{$res->getStatusCode()}: $url");
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}
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}
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public function parse(string $json): Metadata
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{
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$activityOrObject = json_decode($json, true);
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$object = $activityOrObject['object'] ?? $activityOrObject;
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$metadata = new Metadata();
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$metadata->title = isset($object['attributedTo']) ? $this->getTitleFromActor($object['attributedTo']) : '';
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$metadata->description = isset($object['content']) ? $this->html2text($object['content']) : '';
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$metadata->image = $object['attachment'][0]['url'] ?? '';
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return $metadata;
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}
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private function getTitleFromActor(string $url): string
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{
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$res = $this->activityClient->get($url);
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if ($res->getStatusCode() !== 200) {
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return '';
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}
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$actor = json_decode($res->getBody(), true);
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$title = $actor['name'] ?? '';
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if (isset($actor['preferredUsername'])) {
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$title .= ' (@' . $actor['preferredUsername'] . '@' . parse_url($actor['id'], PHP_URL_HOST) . ')';
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}
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return $title;
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}
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private function html2text(string $html): string
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{
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$html = mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8');
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$html = preg_replace('~<br\s*/?\s*>|</p>\s*<p[^>]*>~i', "\n", $html);
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$dom = new \DOMDocument();
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$dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
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return $dom->textContent;
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}
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}
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