Add featured tag add/remove activity handler (#19408)

app/lib/activitypub/activity/add.rb

@@ -2,12 +2,32 @@
 
 class ActivityPub::Activity::Add < ActivityPub::Activity
   def perform
-    return unless @json['target'].present? && value_or_id(@json['target']) == @account.featured_collection_url
+    return if @json['target'].blank?
 
+    case value_or_id(@json['target'])
+    when @account.featured_collection_url
+      case @object['type']
+      when 'Hashtag'
+        add_featured_tags
+      else
+        add_featured
+      end
+    end
+  end
+
+  private
+
+  def add_featured
     status = status_from_object
 
     return unless !status.nil? && status.account_id == @account.id && !@account.pinned?(status)
 
     StatusPin.create!(account: @account, status: status)
   end
+
+  def add_featured_tags
+    name = @object['name']&.delete_prefix('#')
+
+    FeaturedTag.create!(account: @account, name: name) if name.present?
+  end
 end

app/lib/activitypub/activity/remove.rb

@@ -2,8 +2,22 @@
 
 class ActivityPub::Activity::Remove < ActivityPub::Activity
   def perform
-    return unless @json['target'].present? && value_or_id(@json['target']) == @account.featured_collection_url
+    return if @json['target'].blank?
 
+    case value_or_id(@json['target'])
+    when @account.featured_collection_url
+      case @object['type']
+      when 'Hashtag'
+        remove_featured_tags
+      else
+        remove_featured
+      end
+    end
+  end
+
+  private
+
+  def remove_featured
     status = status_from_uri(object_uri)
 
     return unless !status.nil? && status.account_id == @account.id
@@ -11,4 +25,13 @@ class ActivityPub::Activity::Remove < ActivityPub::Activity
     pin = StatusPin.find_by(account: @account, status: status)
     pin&.destroy!
   end
+
+  def remove_featured_tags
+    name = @object['name']&.delete_prefix('#')
+
+    return if name.blank?
+
+    featured_tag = FeaturedTag.by_name(name).find_by(account: @account)
+    featured_tag&.destroy!
+  end
 end

app/models/featured_tag.rb

@@ -22,6 +22,8 @@ class FeaturedTag < ApplicationRecord
   before_create :set_tag
   before_create :reset_data
 
+  scope :by_name, ->(name) { joins(:tag).where(tag: { name: HashtagNormalizer.new.normalize(name) }) }
+
   delegate :display_name, to: :tag
 
   attr_writer :name