feat: メールアドレスを使用してユーザー名を割り出す機能

Resolve #10158

packages/backend/src/server/api/endpoints/admin/accounts/find-by-email.ts

@@ -0,0 +1,61 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and other misskey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import type { UserProfilesRepository } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';
+import { UserEntityService } from '@/core/entities/UserEntityService.js';
+import { ApiError } from '@/server/api/error.js';
+
+export const meta = {
+	tags: ['admin'],
+
+	requireCredential: true,
+	requireAdmin: true,
+
+	errors: {
+		userNotFound: {
+			message: 'No such user who has the email address.',
+			code: 'USER_NOT_FOUND',
+			id: 'cb865949-8af5-4062-a88c-ef55e8786d1d',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		email: { type: 'string' },
+	},
+	required: ['email'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		@Inject(DI.userProfilesRepository)
+		private userProfilesRepository: UserProfilesRepository,
+
+		private userEntityService: UserEntityService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			const profile = await this.userProfilesRepository.findOne({
+				where: { email: ps.email },
+				relations: ['user'],
+			});
+
+			if (profile == null) {
+				throw new ApiError(meta.errors.userNotFound);
+			}
+
+			const res = await this.userEntityService.pack(profile.user!, null, {
+				detail: true,
+			});
+
+			return res;
+		});
+	}
+}