ニコニコ静画のタグを取得する

app/MetadataResolver/NicoSeigaResolver.php

@@ -3,6 +3,7 @@
 namespace App\MetadataResolver;
 
 use GuzzleHttp\Client;
+use Symfony\Component\DomCrawler\Crawler;
 
 class NicoSeigaResolver implements Resolver
 {
@@ -25,7 +26,13 @@ class NicoSeigaResolver implements Resolver
     {
         $res = $this->client->get($url);
         if ($res->getStatusCode() === 200) {
-            $metadata = $this->ogpResolver->parse($res->getBody());
+            $html = (string)$res->getBody();
+            $metadata = $this->ogpResolver->parse($html);
+            $crawler = new Crawler($html);
+
+            // タグ
+            $excludeTags = ['R-15'];
+            $metadata->tags = array_values(array_diff($crawler->filter('.tag')->extract(['_text']), $excludeTags));
 
             // ページURLからサムネイルURLに変換
             preg_match('~http://(?:(?:sp\\.)?seiga\\.nicovideo\\.jp/seiga(?:/#!)?|nico\\.ms)/im(\\d+)~', $url, $matches);