misskey/packages/backend/src/server/api/endpoints/federation/show-instance.ts

import { Inject, Injectable } from '@nestjs/common';
import { Endpoint } from '@/server/api/endpoint-base.js';
import type { InstancesRepository } from '@/models/index.js';
import { InstanceEntityService } from '@/core/entities/InstanceEntityService.js';
import { UtilityService } from '@/core/UtilityService.js';
import { DI } from '@/di-symbols.js';

// eslint-disable-next-line import/no-default-export
@Injectable()
export default class extends Endpoint<'federation/show-instance'> {
	name = 'federation/show-instance' as const;
	constructor(
		@Inject(DI.instancesRepository)
		private instancesRepository: InstancesRepository,

		private utilityService: UtilityService,
		private instanceEntityService: InstanceEntityService,
	) {
		super(async (ps, me) => {
			const instance = await this.instancesRepository
				.findOneBy({ host: this.utilityService.toPuny(ps.host) });

			return instance ? await this.instanceEntityService.pack(instance) : null;
		});
	}
}