New API: GET /api/v1/custom_emojis to get a server's custom emojis (#5051)

app/serializers/rest/status_serializer.rb

@@ -17,7 +17,7 @@ class REST::StatusSerializer < ActiveModel::Serializer
   has_many :media_attachments, serializer: REST::MediaAttachmentSerializer
   has_many :mentions
   has_many :tags
-  has_many :emojis
+  has_many :emojis, serializer: REST::CustomEmojiSerializer
 
   def id
     object.id.to_s
@@ -119,14 +119,4 @@ class REST::StatusSerializer < ActiveModel::Serializer
       tag_url(object)
     end
   end
-
-  class CustomEmojiSerializer < ActiveModel::Serializer
-    include RoutingHelper
-
-    attributes :shortcode, :url
-
-    def url
-      full_asset_url(object.image.url)
-    end
-  end
 end