upd: add decline endpoint and free up username on decline

packages/backend/src/server/api/endpoints/admin/decline-user.ts

@@ -0,0 +1,67 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import type { UsedUsernamesRepository, UserProfilesRepository, UsersRepository } from '@/models/_.js';
+import { ModerationLogService } from '@/core/ModerationLogService.js';
+import { DI } from '@/di-symbols.js';
+import { EmailService } from '@/core/EmailService.js';
+import { DeleteAccountService } from '@/core/DeleteAccountService.js';
+
+export const meta = {
+	tags: ['admin'],
+
+	requireCredential: true,
+	requireModerator: true,
+	kind: 'write:admin:decline-user',
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		userId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['userId'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		@Inject(DI.usersRepository)
+		private usersRepository: UsersRepository,
+
+        @Inject(DI.userProfilesRepository)
+		private userProfilesRepository: UserProfilesRepository,
+
+		@Inject(DI.usedUsernamesRepository)
+		private usedUsernamesRepository: UsedUsernamesRepository,
+
+		private moderationLogService: ModerationLogService,
+        private emailService: EmailService,
+		private deleteAccountService: DeleteAccountService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			const user = await this.usersRepository.findOneBy({ id: ps.userId });
+
+			if (user == null) {
+				throw new Error('user not found');
+			}
+
+			const profile = await this.userProfilesRepository.findOneBy({ userId: ps.userId });
+
+			if (profile?.email) {
+				this.emailService.sendEmail(profile.email, 'Account Declined',
+					'Your Account has been declined!',
+					'Your Account has been declined!');
+			}
+
+			await this.usedUsernamesRepository.delete({ username: user.username });
+
+			await this.deleteAccountService.deleteAccount(user);
+
+			this.moderationLogService.log(me, 'decline', {
+				userId: user.id,
+				userUsername: user.username,
+				userHost: user.host,
+			});
+		});
+	}
+}