#399

backend/app/services/post_metadata_fetcher.rb

@@ -6,9 +6,22 @@ class PostMetadataFetcher
     document = Nokogiri::HTML.parse(response.body)
     content = -> name { document.at_css("meta[property='#{ name }'], meta[name='#{ name }']")&.[]('content')&.strip.presence }
     duration = content.call('og:video:duration') || content.call('video:duration')
+    published = content.call('article:published_time') || content.call('date')
+    published_at = Time.zone.parse(published.to_s) if published.present?
+    platform_tags = platform_tags(uri)
     { title: metadata[:title],
       thumbnail_base: Preview::KnownSiteExtractor.thumbnail_url(uri) || metadata[:image_url],
-      original_created_from: content.call('article:published_time') || content.call('date'),
-      duration: duration&.to_f&.then { _1.positive? ? (_1 * 1_000).round : nil } }
+      original_created_from: published_at&.iso8601,
+      original_created_before: published_at && (published_at + 1.minute).iso8601,
+      duration: duration&.to_f&.then { _1.positive? ? (_1 * 1_000).round : nil },
+      tags: platform_tags.join(' ') }
   end
+
+  def self.platform_tags uri
+    return ['動画', 'YouTube'] if Preview::KnownSiteExtractor.thumbnail_url(uri)
+    return ['動画', 'ニコニコ'] if Preview::KnownSiteExtractor.niconico_video_id(uri)
+
+    []
+  end
+  private_class_method :platform_tags
 end