#399

backend/app/services/post_metadata_fetcher.rb

@@ -7,21 +7,39 @@ class PostMetadataFetcher
     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?
+    created_range = original_created_range(published)
     platform_tags = platform_tags(uri)
     { title: metadata[:title],
       thumbnail_base: Preview::KnownSiteExtractor.thumbnail_url(uri) || metadata[:image_url],
-      original_created_from: published_at&.iso8601,
-      original_created_before: published_at && (published_at + 1.minute).iso8601,
+      original_created_from: created_range&.first&.iso8601,
+      original_created_before: created_range&.last&.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', 'YouTube'] if Preview::KnownSiteExtractor.youtube_video_id(uri)
     return ['動画', 'ニコニコ'] if Preview::KnownSiteExtractor.niconico_video_id(uri)
 
     []
   end
-  private_class_method :platform_tags
+
+  def self.original_created_range value
+    return nil if value.blank?
+
+    raw = value.to_s.strip
+    from = Time.zone.parse(raw)
+    before =
+        case raw
+        when /\A\d{4}\z/ then from + 1.year
+        when /\A\d{4}-\d{2}\z/ then from + 1.month
+        when /\A\d{4}-\d{2}-\d{2}\z/ then from + 1.day
+        when /:\d{2}(?:Z|[+-]\d{2}:?\d{2})?\z/ then from + 1.second
+        else from + 1.minute
+        end
+    [from, before]
+  rescue ArgumentError, TypeError
+    nil
+  end
+  private_class_method :platform_tags, :original_created_range
 end