fix(backend): fix ApPersonService unsound type cast (#15629)

Signed-off-by: eternal-flame-AD <yume@yumechi.jp>

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 ### Server
 - Fix: DBマイグレーション際にシステムアカウントのユーザーID判定が正しくない問題を修正
+- Fix: user.featured列が状況によってJSON文字列になっていたのを修正
 
 
 ## 2025.3.0

packages/backend/migration/1741424411879-user-featured-fixup.js

@@ -0,0 +1,26 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export class UserFeaturedFixup1741424411879 {
+    name = 'UserFeaturedFixup1741424411879'
+
+    async up(queryRunner) {
+        await queryRunner.query(`CREATE OR REPLACE FUNCTION pg_temp.extract_ap_id(text) RETURNS text AS $$
+            SELECT
+                CASE
+                    WHEN $1 ~ '^https?://' THEN $1
+                    WHEN $1 LIKE '{%' THEN COALESCE(jsonb_extract_path_text($1::jsonb, 'id'), null)
+                    ELSE null
+                END;
+        $$ LANGUAGE sql IMMUTABLE;`);
+
+        // "host" is NOT NULL is not needed but just in case add it to prevent overwriting irreplaceable data
+        await queryRunner.query(`UPDATE "user" SET "featured" = pg_temp.extract_ap_id("featured") WHERE "host" IS NOT NULL`);
+    }
+
+    async down(queryRunner) {
+        // fixup migration, no down migration
+    }
+}

packages/backend/src/core/activitypub/models/ApPersonService.ts

@@ -560,7 +560,7 @@ export class ApPersonService implements OnModuleInit {
 			inbox: person.inbox,
 			sharedInbox: person.sharedInbox ?? person.endpoints?.sharedInbox ?? null,
 			followersUri: person.followers ? getApId(person.followers) : undefined,
-			featured: person.featured,
+			featured: person.featured ? getApId(person.featured) : undefined,
 			emojis: emojiNames,
 			name: truncate(person.name, nameLength),
 			tags,