tissue/app/MetadataResolver/PixivResolver.php

<?php

namespace App\MetadataResolver;

use GuzzleHttp\Client;

class PixivResolver implements Resolver
{
    /**
     * @var Client
     */
    private $client;
    /**
     * @var OGPResolver
     */
    private $ogpResolver;

    public function __construct(Client $client, OGPResolver $ogpResolver)
    {
        $this->client = $client;
        $this->ogpResolver = $ogpResolver;
    }

    /**
     * 直リン可能な pixiv.cat のプロキシ URL に変換する
     * HUGE THANKS TO PIXIV.CAT!
     *
     * @param string $pixivUrl i.pximg URL
     *
     * @return string i.pixiv.cat URL
     */
    public function proxize(string $pixivUrl): string
    {
        return str_replace('i.pximg.net', 'i.pixiv.cat', $pixivUrl);
    }

    public function resolve(string $url): Metadata
    {
        if (preg_match('~www\.pixiv\.net/user/\d+/series/\d+~', $url, $matches)) {
            $res = $this->client->get($url);
            $metadata = $this->ogpResolver->parse($res->getBody());
            $metadata->image = $this->proxize($metadata->image);

            return $metadata;
        }

        $page = 0;
        if (preg_match('~www\.pixiv\.net/artworks/(\d+)~', $url, $matches)) {
            $illustId = $matches[1];
        } else {
            parse_str(parse_url($url, PHP_URL_QUERY), $params);
            $illustId = $params['illust_id'];

            // 漫画ページ（ページ数はmanga_bigならあるかも）
            if ($params['mode'] === 'manga_big' || $params['mode'] === 'manga') {
                $page = $params['page'] ?? 0;
            }
        }

        $res = $this->client->get('https://www.pixiv.net/ajax/illust/' . $illustId);
        $json = json_decode($res->getBody()->getContents(), true);
        $metadata = new Metadata();

        $metadata->title = $json['body']['illustTitle'] ?? '';
        $metadata->description = '投稿者: ' . $json['body']['userName'] . PHP_EOL . strip_tags(str_replace('<br />', PHP_EOL, $json['body']['illustComment'] ?? ''));
        $metadata->image = $this->proxize($json['body']['urls']['regular'] ?? '');

        // ページ数の指定がある場合は画像URLをそのページにする
        if ($page != 0) {
            $metadata->image = str_replace('_p0', '_p' . $page, $metadata->image);
        }

        // タグ
        if (!empty($json['body']['tags']['tags'])) {
            foreach ($json['body']['tags']['tags'] as $tag) {
                // 一部の固定キーワードは無視
                if (array_search($tag['tag'], ['R-18', 'イラスト', 'pixiv', 'ピクシブ'], true) === false) {
                    $metadata->tags[] = preg_replace('/\s/', '_', $tag['tag']);
                }
            }
        }

        return $metadata;
    }
}