tissue/app/MetadataResolver/CienResolver.php

45 lines
1.2 KiB
PHP

<?php
namespace App\MetadataResolver;
use Carbon\Carbon;
use GuzzleHttp\Client;
class CienResolver extends MetadataResolver
{
/**
* @var Client
*/
private $client;
/**
* @var OGPResolver
*/
private $ogpResolver;
public function __construct(Client $client, OGPResolver $ogpResolver)
{
$this->client = $client;
$this->ogpResolver = $ogpResolver;
}
public function resolve(string $url): Metadata
{
$res = $this->client->get($url);
$metadata = $this->ogpResolver->parse((string) $res->getBody());
// JWTがついていれば画像URLのJWTから有効期限を拾う
parse_str(parse_url($metadata->image, PHP_URL_QUERY), $params);
if (isset($params['jwt'])) {
$parts = explode('.', $params['jwt']);
if (count($parts) !== 3) {
throw new \RuntimeException('Invalid jwt. Image=' . $metadata->image . ' Source=' . $url);
}
$payload = json_decode(base64_decode(str_replace(['-', '_'], ['+', '/'], $parts[1])), true);
$metadata->expires_at = Carbon::createFromTimestamp($payload['exp']);
}
return $metadata;
}
}