Fix: リモートから自分のサーバーの絵文字を使ってスタンプをつけられた時、既存の絵文字が消えてしまう場合がある問題

app/lib/activitypub/activity/like.rb

@@ -94,7 +94,12 @@ class ActivityPub::Activity::Like < ActivityPub::Activity
     return if custom_emoji_parser.shortcode.blank? || custom_emoji_parser.image_remote_url.blank?
 
     domain = tag['domain'] || URI.split(custom_emoji_parser.uri)[2] || @account.domain
-    domain = nil if domain == Rails.configuration.x.local_domain || domain == Rails.configuration.x.web_domain
+
+    if domain == Rails.configuration.x.local_domain || domain == Rails.configuration.x.web_domain
+      # Block overwriting remote-but-local data
+      return CustomEmoji.find_by(shortcode: custom_emoji_parser.shortcode, domain: nil)
+    end
+
     return if domain.present? && skip_download?(domain)
 
     emoji = CustomEmoji.find_by(shortcode: custom_emoji_parser.shortcode, domain: domain)

spec/lib/activitypub/activity/like_spec.rb

@@ -185,6 +185,10 @@ RSpec.describe ActivityPub::Activity::Like do
         }
       end
 
+      before do
+        Fabricate(:custom_emoji, domain: nil, shortcode: 'tinking', license: 'Everyone but Ohagi')
+      end
+
       it 'create emoji reaction' do
         expect(subject.count).to eq 1
         expect(subject.first.name).to eq 'tinking'