Add: #87 フォロワーのみに購読を許可する設定 (#239)

* Wip: マイグレーション、設定など一式

* Fix test

* Fix test

* Fix: マスター用の設定を他サーバーに送信しないよう修正

* DTL、外部サーバーの情報受け入れのテストを追加

* スペルミスを修正

* Web画面に設定項目追加

* 既存の`master_settings`を上書きしないよう修正

app/models/concerns/account_master_settings.rb

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+module AccountMasterSettings
+  extend ActiveSupport::Concern
+
+  included do
+    def subscription_policy
+      return master_settings['subscription_policy']&.to_sym || :allow if master_settings.present?
+
+      # allow, followers_only, block
+      :allow
+    end
+
+    def subscription_policy=(val)
+      self.master_settings = (master_settings.nil? ? {} : master_settings).merge({ 'subscription_policy' => val })
+    end
+
+    def all_subscribable?
+      subscription_policy == :allow
+    end
+
+    def public_master_settings
+      {
+        'subscription_policy' => subscription_policy,
+      }
+    end
+  end
+end

app/models/concerns/account_other_settings.rb

@@ -104,7 +104,7 @@ module AccountOtherSettings
     end
 
     def public_settings_for_local
-      public_settings
+      public_settings.merge(public_master_settings)
     end
   end
 end