feat: preserved usernames

Resolve #10704

4 files changed, 22 insertions, 2 deletions

diff --git a/packages/backend/src/server/api/endpoints/admin/accounts/create.ts b/packages/backend/src/server/api/endpoints/admin/accounts/create.ts
index bac8ae16e5..8a3541dffe 100644
--- a/packages/backend/src/server/api/endpoints/admin/accounts/create.ts
+++ b/packages/backend/src/server/api/endpoints/admin/accounts/create.ts
@@ -52,6 +52,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 			const { account, secret } = await this.signupService.signup({
 				username: ps.username,
 				password: ps.password,
+				ignorePreservedUsernames: true,
 			});
 
 			const res = await this.userEntityService.pack(account, account, {
diff --git a/packages/backend/src/server/api/endpoints/admin/meta.ts b/packages/backend/src/server/api/endpoints/admin/meta.ts
index fc318a621a..87a2d22ac2 100644
--- a/packages/backend/src/server/api/endpoints/admin/meta.ts
+++ b/packages/backend/src/server/api/endpoints/admin/meta.ts
@@ -118,6 +118,14 @@ export const meta = {
 					optional: false, nullable: false,
 				},
 			},
+			preservedUsernames: {
+				type: 'array',
+				optional: false, nullable: false,
+				items: {
+					type: 'string',
+					optional: false, nullable: false,
+				},
+			},
 			hcaptchaSecretKey: {
 				type: 'string',
 				optional: true, nullable: true,
@@ -311,6 +319,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 				hiddenTags: instance.hiddenTags,
 				blockedHosts: instance.blockedHosts,
 				sensitiveWords: instance.sensitiveWords,
+				preservedUsernames: instance.preservedUsernames,
 				hcaptchaSecretKey: instance.hcaptchaSecretKey,
 				recaptchaSecretKey: instance.recaptchaSecretKey,
 				turnstileSecretKey: instance.turnstileSecretKey,
diff --git a/packages/backend/src/server/api/endpoints/admin/update-meta.ts b/packages/backend/src/server/api/endpoints/admin/update-meta.ts
index ae2fc84b50..0e94f56cfd 100644
--- a/packages/backend/src/server/api/endpoints/admin/update-meta.ts
+++ b/packages/backend/src/server/api/endpoints/admin/update-meta.ts
@@ -95,6 +95,7 @@ export const paramDef = {
 		enableChartsForRemoteUser: { type: 'boolean' },
 		enableChartsForFederatedInstances: { type: 'boolean' },
 		serverRules: { type: 'array', items: { type: 'string' } },
+		preservedUsernames: { type: 'array', items: { type: 'string' } },
 	},
 	required: [],
 } as const;
@@ -392,6 +393,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 				set.serverRules = ps.serverRules;
 			}
 
+			if (ps.preservedUsernames !== undefined) {
+				set.preservedUsernames = ps.preservedUsernames;
+			}
+
 			await this.metaService.update(set);
 			this.moderationLogService.insertModerationLog(me, 'updateMeta');
 		});
diff --git a/packages/backend/src/server/api/endpoints/username/available.ts b/packages/backend/src/server/api/endpoints/username/available.ts
index c80b6efdcd..6293c5cb50 100644
--- a/packages/backend/src/server/api/endpoints/username/available.ts
+++ b/packages/backend/src/server/api/endpoints/username/available.ts
@@ -4,6 +4,7 @@ import type { UsedUsernamesRepository, UsersRepository } from '@/models/index.js
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { localUsernameSchema } from '@/models/entities/User.js';
 import { DI } from '@/di-symbols.js';
+import { MetaService } from '@/core/MetaService.js';
 
 export const meta = {
 	tags: ['users'],
@@ -39,9 +40,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 
 		@Inject(DI.usedUsernamesRepository)
 		private usedUsernamesRepository: UsedUsernamesRepository,
+
+		private metaService: MetaService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
-			// Get exist
 			const exist = await this.usersRepository.countBy({
 				host: IsNull(),
 				usernameLower: ps.username.toLowerCase(),
@@ -49,8 +51,11 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 
 			const exist2 = await this.usedUsernamesRepository.countBy({ username: ps.username.toLowerCase() });
 
+			const meta = await this.metaService.fetch();
+			const isPreserved = meta.preservedUsernames.map(x => x.toLowerCase()).includes(ps.username.toLowerCase());
+
 			return {
-				available: exist === 0 && exist2 === 0,
+				available: exist === 0 && exist2 === 0 && !isPreserved,
 			};
 		});
 	}