Add emoji reaction deletion api

app/services/un_emoji_react_service.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+class UnEmojiReactService < BaseService
+  include Payloadable
+
+  def call(account, status, emoji_reaction = nil)
+    if emoji_reaction
+      emoji_reaction.destroy!
+      create_notification(emoji_reaction) if !status.account.local? && status.account.activitypub?
+      notify_to_followers(emoji_reaction) if status.account.local?
+    else
+      bulk(account, status)
+    end
+    emoji_reaction
+  end
+
+  private
+
+  def bulk(account, status)
+    EmojiReaction.where(account: account).where(status: status).tap do |emoji_reaction|
+      call(account, status, emoji_reaction)
+    end
+  end
+
+  def create_notification(emoji_reaction)
+    status = emoji_reaction.status
+    ActivityPub::DeliveryWorker.perform_async(build_json(emoji_reaction), status.account_id, status.account.inbox_url)
+  end
+
+  def notify_to_followers(emoji_reaction)
+    status = emoji_reaction.status
+    ActivityPub::RawDistributionWorker.perform_async(build_json(emoji_reaction), status.account_id)
+  end
+
+  def build_json(emoji_reaction)
+    # TODO: change to original serializer for other servers
+    Oj.dump(serialize_payload(emoji_reaction, ActivityPub::UndoLikeSerializer))
+  end
+end