enhance: いくつかの設定ファイルの項目をコントロールパネルで設定するように (#16026)

* wip

* Update CHANGELOG.md

* feat: migrate to existing config value (#16030)

* wip

* Update CHANGELOG.md

---------

Co-authored-by: anatawa12 <anatawa12@icloud.com>

packages/backend/migration/js/migration-config.js

@@ -3,6 +3,29 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+import { path as configYamlPath } from '../../built/config.js';
+import * as yaml from 'js-yaml';
+import fs from "node:fs";
+
 export function isConcurrentIndexMigrationEnabled() {
 	return process.env.MISSKEY_MIGRATION_CREATE_INDEX_CONCURRENTLY === '1';
 }
+
+let loadedConfigCache = undefined;
+
+function loadConfigInternal() {
+	const config = yaml.load(fs.readFileSync(configYamlPath, 'utf-8'));
+
+	return {
+		disallowExternalApRedirect: Boolean(config.disallowExternalApRedirect ?? false),
+		proxyRemoteFiles: Boolean(config.proxyRemoteFiles ?? false),
+		signToActivityPubGet: Boolean(config.signToActivityPubGet ?? true),
+	}
+}
+
+export function loadConfig() {
+	if (loadedConfigCache === undefined) {
+		loadedConfigCache = loadConfigInternal();
+	}
+	return loadedConfigCache;
+}