From 1d34eff63f65dd0809af172cf3b1ed5e24c62eaf Mon Sep 17 00:00:00 2001
From: Takeshi Umeda <noel.yoshiba@gmail.com>
Date: Sat, 22 Oct 2022 18:49:41 +0900
Subject: [PATCH] Add featured tag add/remove activity handler (#19408)

---
 app/lib/activitypub/activity/add.rb    | 22 +++++++++++++++++++++-
 app/lib/activitypub/activity/remove.rb | 25 ++++++++++++++++++++++++-
 app/models/featured_tag.rb             |  2 ++
 3 files changed, 47 insertions(+), 2 deletions(-)

diff --git a/app/lib/activitypub/activity/add.rb b/app/lib/activitypub/activity/add.rb
index 845eeaef79..9e2483983d 100644
--- a/app/lib/activitypub/activity/add.rb
+++ b/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
diff --git a/app/lib/activitypub/activity/remove.rb b/app/lib/activitypub/activity/remove.rb
index f523ead9f6..f5cbef6757 100644
--- a/app/lib/activitypub/activity/remove.rb
+++ b/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
diff --git a/app/models/featured_tag.rb b/app/models/featured_tag.rb
index b16c79ac79..4a8d7224a9 100644
--- a/app/models/featured_tag.rb
+++ b/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