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

db/migrate/20231105225839_add_master_settings_to_accounts.rb

@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+require Rails.root.join('lib', 'mastodon', 'migration_helpers')
+
+class AddMasterSettingsToAccounts < ActiveRecord::Migration[7.1]
+  include Mastodon::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  class Account < ApplicationRecord; end
+
+  def up
+    safety_assured do
+      add_column :accounts, :master_settings, :jsonb
+
+      Account.transaction do
+        Account.find_in_batches do |accounts|
+          accounts.each do |account|
+            account.update(master_settings: { 'subscription_policy' => account.dissubscribable ? 'block' : 'allow' })
+          end
+        end
+      end
+
+      remove_column :accounts, :dissubscribable
+    end
+  end
+
+  def down
+    safety_assured do
+      add_column_with_default :accounts, :dissubscribable, :boolean, default: false, allow_null: false
+
+      Account.transaction do
+        Account.find_in_batches do |accounts|
+          accounts.each do |account|
+            account.update(dissubscribable: account.master_settings.present? && account.master_settings['subscription_policy'] != 'allow')
+          end
+        end
+      end
+
+      remove_column :accounts, :master_settings
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2023_10_28_005948) do
+ActiveRecord::Schema[7.1].define(version: 2023_11_05_225839) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -200,9 +200,9 @@ ActiveRecord::Schema[7.1].define(version: 2023_10_28_005948) do
     t.datetime "requested_review_at", precision: nil
     t.boolean "group_allow_private_message"
     t.integer "searchability", default: 2, null: false
-    t.boolean "dissubscribable", default: false, null: false
     t.jsonb "settings"
     t.boolean "indexable", default: false, null: false
+    t.jsonb "master_settings"
     t.index "(((setweight(to_tsvector('simple'::regconfig, (display_name)::text), 'A'::\"char\") || setweight(to_tsvector('simple'::regconfig, (username)::text), 'B'::\"char\")) || setweight(to_tsvector('simple'::regconfig, (COALESCE(domain, ''::character varying))::text), 'C'::\"char\")))", name: "search_index", using: :gin
     t.index "lower((username)::text), COALESCE(lower((domain)::text), ''::text)", name: "index_accounts_on_username_and_domain_lower", unique: true
     t.index ["domain", "id"], name: "index_accounts_on_domain_and_id"